Patent Application
20200130998
The subject matter disclosed herein generally relates to elevator systems and, more particularly, to a system for health monitoring for elevator and escalator systems.
In electrical-mechanical systems, downtime for maintenance and repair is a driver in total cost of ownership and also contributes to inconvenience to building tenants and customers. Prognostics and health monitoring (PHM) and condition based maintenance (CBM) have been tools utilized for reducing downtime in these complex electrical-mechanical systems. A typical health and usage monitoring system (HUMS) performs vibratory spectral analysis to diagnose impending component failures within an electrical-mechanical system. However, the implementation of a HUMS requires installation of vibratory sensors and associated wireless connectivity with direct power connections to allow for continuous monitoring. This installation with associated power supply can be costly within certain types of electrical-mechanical systems.
According to one embodiment, a system is provided. The system includes a controller coupled to a memory and one or more sensors affixed to an element of the electrical-mechanical system, wherein the one or more sensors comprise a power supply, wherein the one or more sensors are configured to collect sensor data responsive to detection of a vibration in the electrical-mechanical system above a threshold vibration, wherein the sensor data is associated with the element and transmit the sensor data to the controller, wherein the controller is configured to analyze the sensor data to determine a potential maintenance issue associated with the electrical-mechanical system.
In addition to one or more of the features described above, or as an alternative, further embodiments of the system may include that the controller is further configured to transmit the potential maintenance issues to a condition based maintenance system.
In addition to one or more of the features described above, or as an alternative, further embodiments of the system may include that the power supply comprises a battery.
In addition to one or more of the features described above, or as an alternative, further embodiments of the system may include that the one or more sensors operate in a low power state until the detection of the vibration in the electrical-mechanical system above the threshold vibration.
In addition to one or more of the features described above, or as an alternative, further embodiments of the system may include that the element of the electrical-mechanical system comprises at least one bearing.
In addition to one or more of the features described above, or as an alternative, further embodiments of the system may include that the controller is configured to store the sensor data in the memory.
In addition to one or more of the features described above, or as an alternative, further embodiments of the system may include that determining the potential maintenance issues associated with the electrical-mechanical system comprises comparing the sensor data with historical sensor data associated with the moving element to identify a pattern indicative of the potential maintenance issue.
In addition to one or more of the features described above, or as an alternative, further embodiments of the system may include that the electrical-mechanical system is an elevator system.
In addition to one or more of the features described above, or as an alternative, further embodiments of the system may include that the electrical-mechanical system is an escalator system.
In addition to one or more of the features described above, or as an alternative, further embodiments of the system may include that the one or more sensors are configured to collect sensor data responsive to detection of a temperature in the electrical-mechanical system above a threshold temperature.
In addition to one or more of the features described above, or as an alternative, further embodiments of the system may include that the one or more sensors are configured to collect sensor data responsive to a signal received from the controller.
In addition to one or more of the features described above, or as an alternative, further embodiments of the system may include that the threshold vibration is determined based on historical sensor data associated with the electrical-mechanical system.
In addition to one or more of the features described above, or as an alternative, further embodiments of the system may include that the threshold temperature is determined based on historical sensor data associated with the electrical-mechanical system.
According to one embodiment, a method is provided. The method includes collecting, by one or more sensors, sensor data associated with an element of an electrical-mechanical system responsive to detection of a vibration in the electrical-mechanical system above a threshold vibration level, wherein the one or more sensors are affixed to the element of the electrical-mechanical system and analyzing the sensor data to determine a potential maintenance issue associated with the electrical-mechanical system.
In addition to one or more of the features described above, or as an alternative, further embodiments of the method may include transmitting the potential maintenance issues to a condition based maintenance system.
In addition to one or more of the features described above, or as an alternative, further embodiments of the method may include that the one or more sensors include a power supply and the power supply includes a battery.
In addition to one or more of the features described above, or as an alternative, further embodiments of the method may include that the one or more sensors operate in a low power state until the detection of the vibration in the electrical-mechanical system above the threshold vibration.
In addition to one or more of the features described above, or as an alternative, further embodiments of the method may include that the element of the electrical-mechanical system comprises at least one bearing.
In addition to one or more of the features described above, or as an alternative, further embodiments of the method may include determining the potential maintenance issues associated with the electrical-mechanical system comprises comparing the sensor data with historical sensor data associated with the element to identify a pattern indicative of the potential maintenance issue.
In addition to one or more of the features described above, or as an alternative, further embodiments of the method may include that the one or more sensors collect the sensor data responsive to detection of a temperature in the electrical-mechanical system above a threshold temperature.
The present disclosure is illustrated by way of example and not limited in the accompanying figures in which like reference numerals indicate similar elements.
As shown and described herein, various features of the disclosure will be presented. Various embodiments may have the same or similar features and thus the same or similar features may be labeled with the same reference numeral, but preceded by a different first number indicating the figure to which the feature is shown. Thus, for example, element “a” that is shown in FIG. X may be labeled “Xa” and a similar feature in FIG. Z may be labeled “Za.” Although similar reference numbers may be used in a generic sense, various embodiments will be described and various features may include changes, alterations, modifications, etc. as will be appreciated by those of skill in the art, whether explicitly described or otherwise would be appreciated by those of skill in the art.
The roping 107 engages the machine 111, which is part of an overhead structure of the elevator system 101. The machine 111 is configured to control movement between the elevator car 103 and the counterweight 105. The position encoder 113 may be mounted on an upper sheave of a speed-governor system 119 and may be configured to provide position signals related to a position of the elevator car 103 within the elevator shaft 117. In other embodiments, the position encoder 113 may be directly mounted to a moving component of the machine 111, or may be located in other positions and/or configurations as known in the art.
The controller 115 is located, as shown, in a controller room 121 of the elevator shaft 117 and is configured to control the operation of the elevator system 101, and particularly the elevator car 103. For example, the controller 115 may provide drive signals to the machine 111 to control the acceleration, deceleration, leveling, stopping, etc. of the elevator car 103. The controller 115 may also be configured to receive position signals from the position encoder 113. When moving up or down within the elevator shaft 117 along guide rail 109, the elevator car 103 may stop at one or more landings 125 as controlled by the controller 115. Although shown in a controller room 121, those of skill in the art will appreciate that the controller 115 can be located and/or configured in other locations or positions within the elevator system 101.
The machine 111 may include a motor or similar driving mechanism. In accordance with embodiments of the disclosure, the machine 111 is configured to include an electrically driven motor. The power supply for the motor may be any power source, including a power grid, which, in combination with other components, is supplied to the motor.
Although shown and described with a roping system, elevator systems that employ other methods and mechanisms of moving an elevator car within an elevator shaft, such as hydraulic and/or ropeless elevators, may employ embodiments of the present disclosure.
Referring to
In exemplary embodiments, the processing system 200 includes a graphics processing unit 41. Graphics processing unit 41 is a specialized electronic circuit designed to manipulate and alter memory to accelerate the creation of images in a frame buffer intended for output to a display. In general, graphics processing unit 41 is very efficient at manipulating computer graphics and image processing and has a highly parallel structure that makes it more effective than general-purpose CPUs for algorithms where processing of large blocks of data is done in parallel. The processing system 200 described herein is merely exemplary and not intended to limit the application, uses, and/or technical scope of the present disclosure, which can be embodied in various forms known in the art.
Thus, as configured in
Turning now to an overview of technologies that are more specifically relevant to aspects of the disclosure, collection of electrical-mechanical system performance data can be useful for predicting maintenance needs for these types of systems. Electrical-mechanical systems include elevator systems, escalator systems, moving walkways, and the like. To collect performance data associated with these systems, sensors need to be installed at various locations around electrical and mechanical components. In many instances, a reliable power source is not available to power sensors in areas of interest in these systems. For example, in an elevator system hoistway, it can be beneficial to collect vibration data on bearings at or near a sheave and counterweight. These areas of interest are difficult to access and also do not include wiring sufficient to supply power to sensors. There exists a need for an easy to install, low cost, and low power sensor system that can collect performance data within an electrical-mechanical system.
Turning now to an overview of the aspects of the disclosure, one or more embodiments address the above-described shortcomings of the prior art by providing a health monitoring system that employs low power, battery sensors and utilizes processes for reducing power consumption for these sensor. In one or more embodiments, the sensors can be near zero power resonant frequency accelerometers and wireless wake-up for health monitoring and communication. The characteristics of these sensors (e.g., size, battery powered, etc.) allow for installation in hard to reach areas and areas without access to power. The sensors deployed in the health monitoring system can be used to couple to unique frequencies characteristics of failure modes. Sensor data related to areas of interest in the electrical-mechanical systems can be communicated back to the health monitoring system for processing to determine system health and identify/predict potential maintenance issues. To conserve power for these sensors can utilize radio frequency (RF) wake-up technology or any other type of wake-up technology to respond to system level queries and triggers for collection of sensor data. That is to say, the sensors can remain off or in a low power state and then “wake-up” responsive to a triggering event such as a system query or the detection of a vibration, temperature, or other condition within the electrical-mechanical system.
Turning now to a more detailed description of aspects of the present disclosure,
In one or more embodiments, the sensors 310 can be a vibratory and tuned resonant modes for power reduction. In one embodiment, the vibratory spectral response can be selected on fabrication with quiescent power draws of between about 10-100 nW. In one or more embodiments, the sensors 310 include a battery power source. The battery can be a coin-cell battery to supply power to the sensors 310. In one or more embodiments, the sensors 310 can be coupled to the unique frequencies characteristics of failure modes in elevator systems, escalator systems, and other electrical mechanical systems. That is to say, the sensor can be activated at a vibration frequency that is known to indicate a problem or impending problem. The sensors 310 can be installed on areas of interest including, but not limited to, tension member sheave roller bearings, door roller bearings, escalator rollers/bearings, and the like. In one or more embodiments, the sensors 310 can be self-contained and not require any wiring for power or communication with the health monitoring system 306. The sensors 310 draw minimal quiescent power when not sensing vibratory signals above a certain threshold vibration. For example, during normal operations of the elevator system, vibrations will be below a threshold vibration level and the sensors 310 can operate drawing quiescent power. However, when a vibration is detected by the sensors 310 above a threshold vibration level, the sensors 310 can collect and transmit the sensor vibration data to the health monitoring system 306 for processing. The health monitoring system 306 can analyze the sensor vibration data to determine potential maintenance needs for the elevator system. The threshold vibration level can be set in advance by a technician or can be determined based on sensor data collected from the elevator system. The threshold vibration level may depend on the type of sensor utilized. Also, the threshold vibration level can be adjusted based on historical vibration levels within an elevator system. For example, if over time, a vibration range is detected by the sensors 310 and the range is found to be suitable for operation of the elevator system, the threshold vibration can be adjusted to further save power for the sensors 310 installed in the elevator system. The power savings for the sensors 310 relate to the lifetime of the sensors which reduces installation costs. By utilizing sensors 310 with battery power supplies, the sensors 310 can installed in hard to reach locations without the need for access to wired power. By reducing the power consumption of the sensors 310, the system 300 can reduce maintenance costs related to installation of the sensors 310 when the battery runs out.
In one or more embodiments, the sensors 310 can achieve low power operation by tuning the sensors' 310 resonant frequency with the dominant frequencies of the elevator or machine bearings. In embodiments, the sensors 310 can be is a MEMS sensor and can include a low power ASIC (Application-Specific Integrated Circuit) which performs the comparison of the sensor vibratory output to a pre-set threshold. Further, the sensor uses piezoelectric materials which produce electrical output (voltage) proportional to acceleration. The piezoelectric element within the sensor is designed so that its resonant frequency is matched with the dominant frequencies of the mechanical system being monitored.
In one or more embodiments, the health monitoring system 306 can comparing the sensor data with historical sensor data associated with the moving elements of the elevator system to identify a pattern indicative of a potential maintenance issue.
In one or more embodiments, the health monitoring system 306 and sensors 310 can be implemented on the processing system 200 found in
Additional processes may also be included. It should be understood that the processes depicted in
In one or more embodiments, the health monitoring system 506 can be utilized along with sensors 510 for the escalator system 10. As described above, the health monitoring system 506 can utilize sensor data collected from various sensors 510 installed in areas of interest around the escalator 10. These areas of interest can be difficult to access and may not have access to wired power supplies for the sensors 510. The health monitoring system 506 can utilized the sensors 310 described in
A detailed description of one or more embodiments of the disclosed apparatus and method are presented herein by way of exemplification and not limitation with reference to the Figures.
The term “about” is intended to include the degree of error associated with measurement of the particular quantity based upon the equipment available at the time of filing the application.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. 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. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, element components, and/or groups thereof.
While the present disclosure has been described with reference to an exemplary embodiment or embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the essential scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this present disclosure, but that the present disclosure will include all embodiments falling within the scope of the claims.
