Patent Application
20200018019
The present disclosure relates to the field of compaction machines, and more particularly, to vibratory compaction machines and related control systems and methods.
A compaction machine may include a chassis and two vibrating drums rotatably mounted to the chassis so that the drums compact a work surface (e.g., an asphalt mat) as the compaction machine moves thereon. A compaction machine may include eccentric masses (also referred to as eccentric shafts) in the respective drums that are rotated at speed to generate vibrations that are transmitted as impacts by the drums to the work surface. Various examples of compaction machines are discussed, for example, in U.S. Pat. No. 3,871,788 entitled “Vibrating Roller,” U.S. Pat. No. 7,674,070 entitled “Vibratory System For Compactor Vehicles,” and U.S. Publication No. 2003/0026657 entitled “Apparatus And Method For Controlling the Start Up And Phase Relationship Between Eccentric Assemblies.”
Notwithstanding known compaction machines, there continues to exist a need in the art for compaction machines, methods, and/or controllers providing increased efficiency of operation and/or improved compaction.
According to some embodiments of inventive concepts, a vibratory compaction machine includes a chassis, first and second drums rotatably mounted to the chassis to allow rotation of the first and second drums over a work surface, first and second vibration mechanisms, and a vibration controller. The first vibration mechanism is configured to generate vibrations that are transmitted as impacts by the first drum to the work surface, and the second vibration mechanism is configured to generate vibrations that are transmitted as impacts by the second drum to the work surface. The vibration controller is configured to control at least one of the first and second vibration mechanisms so that a first pattern of impacts transmitted to the work surface by the first drum and a second pattern of impacts transmitted to the work surface by the second drum are coordinated as the compaction machine moves over the work surface.
According to other embodiments of inventive concepts, a vibration control system is provided for a compaction machine. The compaction machine includes a chassis, first and second drums rotatably mounted to the chassis to allow rotation of the first and second drums over a work surface, a first vibration mechanism configured to generate vibrations that are transmitted as impacts by the first drum to the work surface, and a second vibration mechanism configured to generate vibrations that are transmitted as impacts by the second drum to the work surface. The vibration control system includes a vibration controller configured to control at least one of the first and second vibration mechanisms so that a first pattern of impacts transmitted to the work surface by the first drum and a second pattern of impacts transmitted to the work surface by the second drum are coordinated as the compaction machine moves over the work surface.
According to still other embodiments of inventive concepts, a method is provided to control vibration in a compaction machine. The compaction machine includes a chassis, first and second drums rotatably mounted to the chassis to allow rotation of the first and second drums over a work surface, a first vibration mechanism configured to generate vibrations that are transmitted as impacts by the first drum to the work surface, and a second vibration mechanism configured to generate vibrations that are transmitted as impacts by the second drum to the work surface. The method includes controlling at least one of the first and second vibration mechanisms so that a first pattern of impacts transmitted to the work surface by the first drum and a second pattern of impacts transmitted to the work surface by the second drum are coordinated as the compaction machine moves over the work surface.
ASPECTS
According to one aspect, a vibratory compaction machine includes a chassis, first and second drums rotatably mounted to the chassis to allow rotation of the first and second drums over a work surface, first and second vibration mechanisms, and a vibration controller. The first vibration mechanism is configured to generate vibrations that are transmitted as impacts by the first drum to the work surface, and the second vibration mechanism is configured to generate vibrations that are transmitted as impacts by the second drum to the work surface. The vibration controller is configured to control at least one of the first and second vibration mechanisms so that a first pattern of impacts transmitted to the work surface by the first drum and a second pattern of impacts transmitted to the work surface by the second drum are coordinated as the compaction machine moves over the work surface.
Impact positions of the second pattern of impacts transmitted to the work surface may be offset with respect to impact positions of the first pattern of impacts transmitted to the work surface. For example, the first and second patterns of impacts may be coordinated with respect to a section of the work surface so that the impact positions of the second pattern of impacts on the section of the work surface are offset with respect to the impact positions of the first pattern of impacts on the section of the work surface once both of the first and second drums have traversed the section of the work surface. Moreover, the impact positions of the second pattern on the section of the work surface are interleaved with respect to the impact positions of the first pattern on the section of the work surface.
The vibratory compaction machine may also include a drive motor coupled with at least one of the first and second drums to propel the compaction machine over the work surface. The first vibration mechanism may include a first eccentric mass mounted inside the first drum, and a first vibration motor coupled with the first eccentric mass wherein the first vibration motor is configured to spin the first eccentric mass inside the first drum to generate the vibrations that are transmitted as the impacts by the first drum to the work surface. The second vibration mechanism may include a second eccentric mass mounted inside the second drum, and a second vibration motor coupled with the second eccentric mass wherein the second vibration motor is configured to spin the second eccentric mass inside the second drum to generate the vibrations that are transmitted as the impacts by the second drum to the work surface. In addition, the vibration controller may be configured to coordinate the first and second patterns of impacts responsive to at least one of a phase of the first eccentric mass, a frequency of rotation of the first eccentric mass, a phase of the second eccentric mass, a frequency of rotation of the second eccentric mass, a speed of the compaction machine over the work surface, a distance traversed by the compaction machine over the work surface, a center to center distance between the first and second drums, and sizes of the first and second drums.
The controller is further configured to adjust relative rotational phases of the first and second eccentric masses while coordinating the first and second patterns of impacts transmitted to the work surface by adjusting at least one of a speed of the vibratory compaction machine, a rotational frequency of the first eccentric mass, a rotational frequency of the second eccentric mass, a distance between impacts of the first pattern delivered by the first drum, a distance between impacts of the second pattern delivered by the second drum, and an offset between adjacent impacts of the first and second patterns.
The controller may be further configured to maintain an offset of rotational phases of the first and second eccentric masses while coordinating the first and second patterns of impacts transmitted to the work surface by controlling at least one of a speed of the vibratory compaction machine, a rotational frequency of the first eccentric mass, a rotational frequency of the second eccentric mass, a distance between impacts of the first pattern delivered by the first drum, a distance between impacts of the second pattern delivered by the second drum, and an offset between adjacent impacts of the first and second patterns.
The controller may be configured to coordinate the first pattern of impacts and the second pattern of impacts by setting operational parameters of the first vibration mechanism to provide the first pattern of impacts transmitted to the work surface by the first drum as a baseline, and adjusting operational parameters of the second vibration mechanism responsive to the baseline to provide the second pattern of impacts transmitted to the work surface.
According to another aspect, a vibration control system is provided for a compaction machine. The compaction machine includes a chassis, first and second drums rotatably mounted to the chassis to allow rotation of the first and second drums over a work surface, a first vibration mechanism configured to generate vibrations that are transmitted as impacts by the first drum to the work surface, and a second vibration mechanism configured to generate vibrations that are transmitted as impacts by the second drum to the work surface. The vibration control system includes a vibration controller configured to control at least one of the first and second vibration mechanisms so that a first pattern of impacts transmitted to the work surface by the first drum and a second pattern of impacts transmitted to the work surface by the second drum are coordinated as the compaction machine moves over the work surface.
Impact positions of the second pattern of impacts transmitted to the work surface may be offset with respect to impact positions of the first pattern of impacts transmitted to the work surface. For example, the first and second patterns of impacts may be coordinated with respect to a section of the work surface so that the impact positions of the second pattern of impacts on the section of the work surface are offset with respect to the impact positions of the first pattern of impacts on the section of the work surface once both of the first and second drums have traversed the section of the work surface. Moreover, the impact positions of the second pattern on the section of the work surface may be interleaved with respect to the impact positions of the first pattern on the section of the work surface.
The compaction machine may further include a drive motor coupled with at least one of the first and second drums to propel the compaction machine over the work surface. The first vibration mechanism may include a first eccentric mass mounted inside the first drum, and a first vibration motor coupled with the first eccentric mass wherein the first vibration motor is configured to spin the first eccentric mass inside the first drum to generate the vibrations that are transmitted as the impacts by the first drum to the work surface. The second vibration mechanism may include a second eccentric mass mounted inside the second drum, and a second vibration motor coupled with the second eccentric mass wherein the second vibration motor is configured to spin the second eccentric mass inside the second drum to generate the vibrations that are transmitted as the impacts by the second drum to the work surface. The vibration controller may be configured to coordinate the first and second patterns of impacts responsive to at least one of a phase of the first eccentric mass, a frequency of rotation of the first eccentric mass, a phase of the second eccentric mass, a frequency of rotation of the second eccentric mass, a speed of the compaction machine over the work surface, a distance traversed by the compaction machine over the work surface, a center to center distance between the first and second drums, and sizes of the first and second drums.
The vibration controller may be further configured to adjust relative rotational phases of the first and second eccentric masses while coordinating the first and second patterns of impacts transmitted to the work surface by adjusting at least one of a speed of the vibratory compaction machine, a rotational frequency of the first eccentric mass, a rotational frequency of the second eccentric mass, a distance between impacts of the first pattern delivered by the first drum, a distance between impacts of the second pattern delivered by the second drum, and an offset between adjacent impacts of the first and second patterns.
The controller may be further configured to maintain an offset of rotational phases of the first and second eccentric masses while coordinating the first and second patterns of impacts transmitted to the work surface by controlling at least one of a speed of the vibratory compaction machine, a rotational frequency of the first eccentric mass, a rotational frequency of the second eccentric mass, a distance between impacts of the first pattern delivered by the first drum, a distance between impacts of the second pattern delivered by the second drum, and an offset between adjacent impacts of the first and second patterns.
The controller may be configured to coordinate the first pattern of impacts and the second pattern of impacts by setting operational parameters of the first vibration mechanism to provide the first pattern of impacts transmitted to the work surface by the first drum as a baseline, and adjusting operational parameters of the second vibration mechanism responsive to the baseline to provide the second pattern of impacts transmitted to the work surface.
According to still another aspect, a method is provided to control vibration in a compaction machine. The compaction machine includes a chassis, first and second drums rotatably mounted to the chassis to allow rotation of the first and second drums over a work surface, a first vibration mechanism configured to generate vibrations that are transmitted as impacts by the first drum to the work surface, and a second vibration mechanism configured to generate vibrations that are transmitted as impacts by the second drum to the work surface. The method includes controlling at least one of the first and second vibration mechanisms so that a first pattern of impacts transmitted to the work surface by the first drum and a second pattern of impacts transmitted to the work surface by the second drum are coordinated as the compaction machine moves over the work surface.
Impact positions of the second pattern of impacts transmitted to the work surface may be offset with respect to impact positions of the first pattern of impacts transmitted to the work surface. For example, the first and second patterns of impacts may be coordinated with respect to a section of the work surface so that the impact positions of the second pattern of impacts on the section of the work surface are offset with respect to the impact positions of the first pattern of impacts on the section of the work surface once both of the first and second drums have traversed the section of the work surface. Moreover, the impact positions of the second pattern on the section of the work surface may be interleaved with respect to the impact positions of the first pattern on the section of the work surface.
The compaction machine may further include a drive motor coupled with at least one of the first and second drums to propel the compaction machine over the work surface. The first vibration mechanism may include a first eccentric mass mounted inside the first drum, and a first vibration motor coupled with the first eccentric mass wherein the first vibration motor is configured to spin the first eccentric mass inside the first drum to generate the vibrations that are transmitted as the impacts by the first drum to the work surface. The second vibration mechanism may include a second eccentric mass mounted inside the second drum, and a second vibration motor coupled with the second eccentric mass wherein the second vibration motor is configured to spin the second eccentric mass inside the second drum to generate the vibrations that are transmitted as the impacts by the second drum to the work surface. Moreover, controlling may include coordinating the first and second patterns of impacts responsive to at least one of a phase of the first eccentric mass, a frequency of rotation of the first eccentric mass, a phase of the second eccentric mass, a frequency of rotation of the second eccentric mass, a speed of the compaction machine over the work surface, a distance traversed by the compaction machine over the work surface, a center to center distance between the first and second drums, and sizes of the first and second drums.
In addition, the method may include adjusting relative rotational phases of the first and second eccentric masses while coordinating the first and second patterns of impacts transmitted to the work surface by adjusting at least one of a speed of the vibratory compaction machine, a rotational frequency of the first eccentric mass, a rotational frequency of the second eccentric mass, a distance between impacts of the first pattern delivered by the first drum, a distance between impacts of the second pattern delivered by the second drum, and an offset between adjacent impacts of the first and second patterns.
The method may also include maintaining an offset of rotational phases of the first and second eccentric masses while coordinating the first and second patterns of impacts transmitted to the work surface by controlling at least one of a speed of the vibratory compaction machine, a rotational frequency of the first eccentric mass, a rotational frequency of the second eccentric mass, a distance between impacts of the first pattern delivered by the first drum, a distance between impacts of the second pattern delivered by the second drum, and an offset between adjacent impacts of the first and second patterns.
Moreover, coordinating the first pattern of impacts and the second pattern of impacts may include setting operational parameters of the first vibration mechanism to provide the first pattern of impacts transmitted to the work surface by the first drum as a baseline, and adjusting operational parameters of the second vibration mechanism responsive to the baseline to provide the second pattern of impacts transmitted to the work surface.
Other compaction machines, control systems, and methods according to aspects or embodiments will be or become apparent to those with skill in the art upon review of the following drawings and detailed description. It is intended that all such additional compaction machines, control systems, and methods be included within this description and protected by the accompanying claims. Moreover, it is intended that all aspects and embodiments disclosed herein can be implemented separately or combined in any way and/or combination.
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in a constitute a part of this application, illustrate certain non-limiting embodiments of inventive concepts. In the drawings:
Inventive concepts will now be described more fully hereinafter with reference to the accompanying drawings, in which examples of embodiments of inventive concepts are shown. Inventive concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of present inventive concepts to those skilled in the art. It should also be noted that these embodiments are not mutually exclusive. Components from one embodiment may be tacitly assumed to be present/used in another embodiment. Any two or more embodiments described below may be combined in any way with each other. Moreover, certain details of the described embodiments may be modified, omitted, or expanded upon without departing from the scope of the described subject matter.
Each of drums 12 and 13 also includes a vibration mechanism 29. Within the scope of the present embodiment the vibration mechanism 29 may be any device or devices, such as, for example, a variety of eccentric rotating mass systems, linear resonant actuator systems, etc., that are capable of generating vibrations transmitted as impacts by the first and second drums 12 and 13 to the work surface 31. By way of example, the vibration mechanism 29 may be provided using: one eccentric assembly including a single eccentric shaft (single amplitude machine); one eccentric assembly including two eccentric shafts (multiple amplitude machine); multiple eccentric assemblies including single and/or double eccentric shaft systems (oscillatory machines); or using a linear actuator moving a mass at a speed to achieve similar vibration characteristics. Those of ordinary skill in the art will appreciate that numerous vibration mechanisms are known, and the scope of the present embodiment is not limited to the particular vibration system 29 illustrated. While lesser or more complex eccentric systems may be employed within the scope of the present embodiment, for the sake of simplicity and brevity,
In a conventional compaction machine, front and rear drums may vibrate independently. Accordingly, impacts may be inefficiently delivered by the front and rear drums over a same section of asphalt. If impacts are delivered by the front and rear drums at the same locations over a section of asphalt, for example, uneven compaction may occur requiring more passes of the compaction machine to achieve a desired uniformity and/or density of the asphalt, thereby reducing efficiency. Moreover, insufficient control of the vibrations of the front and rear drums may result in increased vibration through the chassis, potentially causing durability issues with respect to the compaction machine and/or components thereof.
Impacts per foot is one parameter used to measure machine performance. During operation, each eccentric mass may be rotated to generate vibrations transmitted as impacts by the first and second drums 12 and 13 to the work surface 31 The frequency of impacts and the compaction machine travel speed together determine the impacts per foot for each drum, which may strongly influence a number of passes the compaction machine must make over a given section of asphalt (also referred to as a patch or length of asphalt) to achieve a desired density of the asphalt. Each drum, for example, may deliver in the range of 5 to 20 impacts per foot (so that positions/locations of consecutive impacts of a drum are spaced 2.40 to 0.60 inches across the asphalt), and more particularly, in the range of 10 to 14 impacts per foot (so that positions/locations of consecutive impacts are spaced in the range of 1.20 to 0.86 inches across the asphalt). With current vibratory drum system designs, a lack of coordination between positions/locations of impact delivered by the two drums may result in additional passes.
According to some embodiments of inventive concepts, a control system may be provided to coordinate impacts of the first and second drums to allow tuning for improved performance and/or efficiency. Moreover, relative phases of the eccentric masses may be adjusted while coordinating impacts to reduce vibrations transmitted through the chassis. In order to adjust relative phases of the eccentric masses while maintaining coordination of leading and trailing drum impact patterns, relative offsets between leading and trailing drum impact patterns may be adjusted, speed of the compaction machine may be adjusted, and/or frequencies of rotation of the leading and trailing eccentric masses may be adjusted.
As discussed herein, a pattern of impacts refers to a pattern of impact positions on an asphalt mat (or other work surface 31) at which a vibratory compaction drum delivers impacts to the asphalt mat due to vibrations caused by the rotating eccentric mass. Moreover, first (e.g., leading) drum 12 and second (e.g., trailing) drum 13 of a vibratory compaction machine will deliver respective first and second patterns of impacts to a same section of asphalt at different times because the leading and trailing drums pass over the section of asphalt at different times. According to some embodiments of inventive concepts disclosed herein, impact positions of the second pattern of impacts from the second drum 13 may be offset and interleaved with respect to impacts from the first drum 12 over the section of asphalt even though the first and second drums 12 and 13 traverse the section of asphalt at different times.
By deliberately tuning vibrations of the drums (e.g., by controlling frequencies of rotation of the respective eccentric masses, phases of rotation of eccentric masses, speed of the compaction machine, etc.), impact positions of the trailing drum 13 may be shifted slightly or offset with respect to impact positions of the leading drum 12 over the same section of asphalt after both drums have passed over that section of asphalt, while both drums deliver a same number of impacts per unit length (e.g., impacts per foot). For example, impacts of the trailing drum 13 may be controlled to hit peaks (areas of lesser density) that were left behind by the leading drum 12. Stated in other words, vibrations of the drums may be coordinated/controlled so that positions of impact (also referred to as locations of impact) of the trailing drum 13 on the asphalt may be controlled to fall between positions of impact of the leading drum on the asphalt.
As the compaction machine moves from right to left across the asphalt mat work surface 31 in
As shown in
Impact positions of the leading drum 12 indicated with solid line arrows and impact positions of the trailing drum 13 indicated with longer dashed line arrows over section 31c may thus be interleaved and offset in a pattern as shown in
As shown in
In greater detail, section 31a of the asphalt mat work surface 31 has not been compacted by either drum, section 31b of the asphalt mat work surface 31 has been compacted by the leading drum 12 but not the trailing drum 13, and section 31c of the asphalt mat work surface 31 has been compacted by both the leading and trailing drums 12 and 13. Based on the speed of the compaction machine and vibrations generated by rotation of eccentric mass 23a, leading drum 12 may generate impacts at locations on the asphalt mat work surface 31 indicated by the solid line arrows. Over section 31b of the asphalt mat work surface 31 where only the leading drum 12 has passed, variations in density and/or surface (e.g., peaks and valleys) may occur as indicated by the representation of the asphalt mat work surface below the arrows. To reduce these variations, vibrations of the trailing drum 13 may be controlled so that impact positions of the trailing drum 13 will occur between previous impact positions of the leading drum 12. For example, impacts of the trailing drum 13 may occur at surface peaks left by the leading drum 12 and/or at regions of lower asphalt density left by the leading drum 12. The shorter dashed line arrows for section 31b indicate intended impacts of the trailing drum 13. According to some embodiments, impact locations of the trailing drum 13 may be evenly spaced between impact locations of the leading drum 12 to reduce variations in density and/or surface peaks/valleys.
For section 31c where both the leading and trailing drums 12 and 13 have passed, the solid line arrows indicate impact positions from the leading drum 12 on the asphalt mat work surface and the longer dashed line arrows indicate impact positions from the trailing drum 13 on the asphalt mat work surface. As shown, the impact positions of the trailing drum 13 may be arranged between the impact positions of the leading drum 12 on the section 31c of the asphalt mat work surface 31 where both leading and trailing drums have passed. Over section 31c of the asphalt mat work surface 31, variations in density and/or surface (e.g., peaks and valleys) may be reduced as indicated by the representation of the asphalt surface below the arrows. By offsetting and interleaving impact positions of the leading and trailing drums 12 and 13, a uniformity of asphalt density and/or surface may be improved.
A control system of
Eccentric mass sensors 405a and 405b (e.g., coupled with the respective vibration motors) may thus provide phase positions of eccentric masses 23a and 23b to be used by controller 401 to coordinate impact patterns of leading and trailing drums 12 and 13. In a single amplitude machine (with a single eccentric mass in each drum) as shown in
Distance travelled while vibrations of leading and trailing drums 12 and 13 are turned on may be calculated continuously by speed/distance sensor 403 and thus known to controller 401. This information may use fixed machine geometry (e.g., drum diameter, center to center distance between drums, etc.) and operator inputs (e.g., travel speed) to produce and update the data used by controller 401.
Control logic of controller 401 may thus monitor and adjust machine parameters (e.g., machine speed, frequency/phase of rotation of leading drum, frequency/phase of rotation of trailing drum, space between impacts of each drum on the working surface, offsets between impacts of leading and trailing drums, etc.) to achieve a desired performance in terms of impact coordination between leading and trailing drums, impacts per unit length (e.g., impacts per foot), impact amplitude, vibration, etc.
According to some embodiments, leading drum 12 may be set as a master or baseline from which other parameters may be adjusted. In such a system, trailing drum 13 may be set as a slave so that parameters of the trailing drum 13 (e.g., rotational frequency/phase of eccentric mass 23b) may be adjusted to achieve a desired coordination of impact patterns of leading and trailing drums 12 and 13. According to some other embodiments, trailing drum 13 may be set as a master, and leading drum 12 may be set as a slave so that parameters of the leading drum 12 may be adjusted to achieve a desired coordination. Moreover, the compaction machine may operate in both forward and in reverse so that one drum is set as the master when the compaction machine travels in one direction (e.g., forward) and the other drum is set as the master when the compaction machine travels in the other direction (e.g., reverse).
According to some embodiments of inventive concepts, impacts and/or vibrations of the leading and trailing drums may be coordinated to provide improved performance, efficiency, and/or quality of asphalt. By controlling phases of impacts delivered by the leading and trailing drums, the trailing drum may be controlled to compact targeted zones in the asphalt mat work surface that were missed by the leading drum, thereby allowing for fewer compaction machine passes to achieve a desired asphalt density. Moreover, by coordinating machine speed with the coordinated impact patterns of the leading and trailing drums (e.g., space between adjacent impact locations of each drum on the asphalt mat, an offset between impact patterns of the two drums, etc.), a desired phase relationship between eccentric masses may be achieved to reduce vibrations coupled into the chassis of the machine.
Operations of controller 401 will now be discussed with reference to the flow charts of
According to some embodiments, operations of coordinating impact patterns at block 603 may be performed as discussed with respect to blocks 603a and 603b of
Operations of blocks 601 and 603 may thus provide an inner control loop coordinating impact patterns from leading and trailing drums 12 and 13. At block 605, controller 401 may monitor rotational phases of eccentric masses 23a and 23b and/or chassis vibration to maintain a desired phase offset and/or to reduce vibrations transmitted to the chassis. Responsive to monitoring at block 605, controller 401 may determine whether a phase offset between eccentric masses 23a and 23b is within a desired range and/or whether chassis vibrations are within a desired range. Provided that the rotational phases of eccentric masses 23a and 23b are within a desired range (e.g., that the phases are sufficiently offset) and/or that the chassis vibration is within a desired range (e.g., that chassis vibration is sufficiently low), controller 401 may continue operations of blocks 601 and 603.
Responsive to rotational phases of eccentric masses 23a and 23b falling outside the desired range (e.g., that the phases are not sufficiently offset) and/or chassis vibration falling outside the desired range (e.g., that the chassis vibration is too high) at block 607, controller 401 may adjust relative phases of eccentric masses 23a and 23b to provide a sufficient offset at block 609. Controller 401, for example, may adjust relative rotational phases of eccentric masses 23a and 23b at block 609 while coordinating the first and second patterns of impacts transmitted to the work surface 31 at blocks 601 and 603 by adjusting at least one of a speed of the vibratory compaction machine, a rotational frequency of the eccentric mass 23a, a rotational frequency of eccentric mass 23b, a distance between impacts of the first pattern delivered by leading drum 12 (i.e., adjusting impacts per unit length), and a distance between impacts of the second pattern delivered by trailing drum 13. Operations of blocks 605, 607, and 609 may thus provide an outer control look to provide that vibrations through the chassis do not exceed a desired threshold. Moreover, adjusting the relative phases may include adjusting the relative phases by adjusting a center-to-center distance between drums 12 and 13, for example, by adjusting an articulable coupling between front and rear portions 16 and 18 of the chassis.
According to some other embodiments, controller 401 may maintain an offset of rotational phases of the first and second eccentric masses at block 607. More particularly, controller 401 may maintain the offset of rotational phases while coordinating the first and second patterns of impacts transmitted to the work surface 31 by controlling at least one of a speed of the vibratory compaction machine, a rotational frequency of the first eccentric mass, a rotational frequency of the second eccentric mass, a distance between impacts of the first pattern delivered by the first drum, a distance between impacts of the second pattern delivered by the second drum, and an offset between adjacent impacts of the first and second patterns. Moreover, maintaining the relative phases may include maintaining the relative phases by adjusting a center-to-center distance between drums 12 and 13, for example, by adjusting and articulable coupling between front and rear portions 16 and 18 of the chassis.
Controller 401 may include a processor coupled with a memory and an interface circuit, and the interface circuit may provide communication between the processor and speed/distance sensor 403, the leading and trailing eccentric mass sensors 405a-b, the speed control interface 407, and the vibration control interfaces 409a-b. The processor may thus be configured to execute computer program code in the memory (described below as a non-transitory computer readable medium) to perform at least some of the operations discussed above with respect to
The control system of
In the above-description of various embodiments of the present disclosure, it is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
When an element is referred to as being “connected”, “coupled”, “responsive”, “mounted”, or variants thereof to another element, it can be directly connected, coupled, responsive, or mounted to the other element or intervening elements may be present. In contrast, when an element is referred to as being “directly connected”, “directly coupled”, “directly responsive”, “directly mounted” or variants thereof to another element, there are no intervening elements present. Like numbers refer to like elements throughout. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Well-known functions or constructions may not be described in detail for brevity and/or clarity. The term “and/or” and its abbreviation “/” include any and all combinations of one or more of the associated listed items.
It will be understood that although the terms first, second, third, etc. may be used herein to describe various elements/operations, these elements/operations should not be limited by these terms. These terms are only used to distinguish one element/operation from another element/operation. Thus a first element/operation in some embodiments could be termed a second element/operation in other embodiments without departing from the teachings of present inventive concepts. The same reference numerals or the same reference designators denote the same or similar elements throughout the specification.
As used herein, the terms “comprise”, “comprising”, “comprises”, “include”, “including”, “includes”, “have”, “has”, “having”, or variants thereof are open-ended, and include one or more stated features, integers, elements, steps, components or functions but do not preclude the presence or addition of one or more other features, integers, elements, steps, components, functions or groups thereof. Furthermore, as used herein, the common abbreviation “e.g.”, which derives from the Latin phrase “exempli gratia,” may be used to introduce or specify a general example or examples of a previously mentioned item, and is not intended to be limiting of such item. The common abbreviation “i.e.”, which derives from the Latin phrase “id est,” may be used to specify a particular item from a more general recitation.
Example embodiments are described herein with reference to block diagrams and/or flowchart illustrations of computer-implemented methods, apparatus (systems and/or devices) and/or computer program products. It is understood that a block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions that are performed by one or more computer circuits. These computer program instructions may be provided to a processor circuit of a general purpose computer circuit, special purpose computer circuit, and/or other programmable data processing circuit to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, transform and control transistors, values stored in memory locations, and other hardware components within such circuitry to implement the functions/acts specified in the block diagrams and/or flowchart block or blocks, and thereby create means (functionality) and/or structure for implementing the functions/acts specified in the block diagrams and/or flowchart block(s).
These computer program instructions may also be stored in a tangible computer-readable medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable medium produce an article of manufacture including instructions which implement the functions/acts specified in the block diagrams and/or flowchart block or blocks. Accordingly, embodiments of present inventive concepts may be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.) that runs on a processor such as a digital signal processor, which may collectively be referred to as “circuitry,” “a module” or variants thereof.
It should also be noted that in some alternate implementations, the functions/acts noted in the blocks may occur out of the order noted in the flowcharts. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality/acts involved. Moreover, the functionality of a given block of the flowcharts and/or block diagrams may be separated into multiple blocks and/or the functionality of two or more blocks of the flowcharts and/or block diagrams may be at least partially integrated. Finally, other blocks may be added/inserted between the blocks that are illustrated, and/or blocks/operations may be omitted without departing from the scope of inventive concepts. Moreover, although some of the diagrams include arrows on communication paths to show a primary direction of communication, it is to be understood that communication may occur in the opposite direction to the depicted arrows.
Persons skilled in the art will recognize that certain elements of the above-described embodiments may variously be combined or eliminated to create further embodiments, and such further embodiments fall within the scope and teachings of inventive concepts. It will also be apparent to those of ordinary skill in the art that the above-described embodiments may be combined in whole or in part to create additional embodiments within the scope and teachings of inventive concepts. Thus, although specific embodiments of, and examples for, inventive concepts are described herein for illustrative purposes, various equivalent modifications are possible within the scope of inventive concepts, as those skilled in the relevant art will recognize. Accordingly, the scope of inventive concepts is determined from the appended claims and equivalents thereof.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2017/023289 | 3/21/2017 | WO | 00 |
