Patent Application
20250207711
This application is based on and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2023-0190360, filed on Dec. 22, 2023, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.
The disclosure relates to a piping vibration absorber apparatus having a vibration monitoring system, and more specifically, to a piping vibration absorber apparatus having a vibration monitoring system so that the piping vibration absorber apparatus may reduce piping vibrations using an elastic plate and a mass plate, absorb vibration energy and shock using a wire damper, absorb vibration energy through a vibration damping material and the curvature of the elastic plate, and supply power to a vibration sensor through its own energy harvesting without external power supply such that the states of piping vibrations may be remotely monitored by the vibration monitoring system.
Vibrations inevitably occur in a power plant piping with fluid flow. Piping vibrations may be caused by pressure pulsation of fluid equipment, vortex by discontinuous shape, turbulence flow, cavitation, water hammer, steam hammer, etc.
If the vibration level of the power plant piping is high, fatigue damage may be caused to welded joints, branch connections, etc, where stress is concentrated, and depending on the degree of damage, the output of the power plant may be reduced or the operation of the power plant may be stopped for repairs. Therefore, high vibration of the piping may be a cause of hindering the normal operation and safety of the power plant. In addition, since it takes time to operate normally, such as analyzing the root cause and establishing improvement measures, there is also a big problem with sales loss due to suspension of the operation of the power plant.
In order to prevent damage to the piping caused by vibrations in the power plant piping, it is necessary to accurately predict the vibration load during the operation of the piping. However, it is practically difficult to accurately predict such vibration load at the design stage.
In the past, the soundness of a piping was confirmed by observing and evaluating the effects of vibrations during startup operations or normal operations, and when high vibration was confirmed, a corrective action was taken to reduce the piping vibrations.
A corrective action may be taken by adding rigid supports or damper supports to the piping. However, since such corrective actions require the installation of pipe supports using structures outside the piping and the re-performance of piping stress analysis to evaluate the soundness of the piping, it is difficult to add pipe supports to a power plant of which construction has been completed and is in startup operations or commercial operations.
To solve this problem, a dynamic vibration absorber has been considered. Piping vibrations may be reduced by installing the dynamic vibration absorber directly in pipe without adding a pipe support using an external structure.
The dynamic vibration absorber may adjust the natural frequency to match the vibration frequency of the piping, and through this, the vibration of the piping and the vibration of the dynamic vibration absorber are in reverse phase, thereby reducing the vibration of the piping by increasing the vibration of the dynamic vibration absorber. In particular, when the piping vibrates at a single frequency component, adjusting the stiffness and mass of the dynamic vibration absorber may completely reduce piping vibration.
However, the conventional dynamic vibration absorber does not have a damping function to prevent fatigue damage and absorb vibration energy, and a shock absorption function to prevent excessive displacement due to impact load from damaging the dynamic vibration absorber.
In addition, conventional dynamic vibration absorbers do not have a vibration monitoring system that may remotely monitor vibration through its own energy harvesting without external power supply, making it difficult to check the vibration trend in real time.
Provided is a piping vibration absorber apparatus having a vibration monitoring system so that the piping vibration absorber apparatus may reduce piping vibration using an elastic plate and a mass plate, absorb vibration energy and shock using a wire damper, absorb vibration energy through a vibration damping material and the curvature of the elastic plate, and supply power to a vibration sensor through its own energy harvesting without external power supply such that the state piping vibrations may be remotely monitored by the vibration monitoring system.
Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments of the disclosure.
According to an aspect of the disclosure, a piping vibration absorber apparatus having a vibration monitoring system to reduce vibration occurring in piping includes a vibration absorber installed in the pipe, wherein the vibration absorber includes an elastic plate having one side coupled to the pipe and formed in a cantilever shape, a mass plate installed on the elastic plate and having a specified mass, and a wire damper including a steel wire and coupled to another side of the elastic plate.
According to an embodiment, the piping vibration absorber apparatus having a vibration monitoring system may include a first clamp and a second clamp coupled to the pipe, wherein the one side of the elastic plate may be coupled to the first clamp, and the wire damper may be coupled to the second clamp.
According to an embodiment, the first clamp may include a first saddle to which the one side of the elastic plate is fixed, and the second clamp may include a second saddle to which the steel wire of the wire damper is fixed.
According to an embodiment, the second saddle is provided with a wire fixing unit for fixing the steel wire, and a length of the steel wire extending from the wire fixing unit to the other side of the elastic plate may be adjusted by adjusting a position where the steel wire is fixed to the wire fixing unit.
According to an embodiment, the steel wire may be formed in a U-shape and may be coupled to the other side of the elastic plate and the wire fixing unit.
According to an embodiment, the elastic plate may include a fixing part coupled to the first clamp, a second flat plate part extending from the fixing part and formed in a flat plate shape, a first flat plate part to which the wire damper is coupled and formed in a flat plate shape, and a curvature part connecting the second flat plate part with the first flat plate part and extending while forming a curvature.
According to an embodiment, the curvature part may include a first curvature part extending while forming a first curvature, a second curvature part extending while forming a second curvature, and a connection part connecting the first curvature part with the second curvature part.
According to an embodiment, the vibration absorber may include a reinforcing plate connecting the lower part of the second flat plate part to the first clamp, wherein the reinforcing plate may be formed in a curved shape.
According to an embodiment, the vibration absorber may include a plurality of the elastic plates, and the vibration absorber may include a vibration damping material provided in at least one of between the plurality of the elastic plates, on the upper portions of the elastic plates, and on the lower portions of the elastic plates.
According to an embodiment, the vibration damping material may be provided between the plurality of first flat plate parts, the second flat plate parts, and the curvature parts and a spacer having the same thickness as the vibration damping material and higher strength than the vibration damping material may be provided between the plurality of fixing parts.
According to an embodiment, the vibration absorber is provided with a plurality of the mass plates, wherein the plurality of the mass plates may be stacked on the elastic plate.
According to an embodiment, the vibration absorber includes an eye bolt and a nut for installing the mass plate on the elastic plate, wherein the eye bolt may be provided with a ring.
According to an embodiment, the vibration absorber includes an eye bolt and a nut for installing the mass plate on the elastic plate, the elastic plate has a slot extending in the longitudinal direction, and the eye bolt may pass through the mass plate and be inserted into the slot.
According to an embodiment, the vibration absorber may include a vibration sensor installed on the elastic plate to measure the vibration of the pipe, and a piezoelectric element installed on the elastic plate and connected to the vibration sensor to supply power to the vibration sensor.
According to an embodiment, the piping vibration absorber apparatus may include a monitoring unit capable of receiving data from the vibration sensor.
According to an embodiment, the piping vibration absorber apparatus may include a plurality of vibration absorbers.
According to an embodiment, the plurality of vibration absorbers may be arranged side by side around the pipe.
According to an embodiment, the plurality of vibration absorbers may be arranged on an upper portion and a lower portion of the pipe around the pipe.
The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the present embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below, by referring to the figures, to explain aspects of the present description. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.
The disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments according to the inventive concept are shown, and the principle of the inventive concept is described so that the embodiments may be practiced by those skilled in the art. The disclosed embodiments may be implemented in various forms.
Expressions such as “including” or “may include” that may be used in various embodiments of the inventive concept indicate the existence of a corresponding function, operation, component, or the like that is disclosed, and do not limit one or more additional functions, operations, components, or the like. In addition, in various embodiments according to the inventive concept, terms such as “comprises,” “has,” or “consists of” are intended to refer to the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but it should be understood that the terms do not preclude the existence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.
When it is said that a component is “connected and coupled” to another component, it should be understood that said component may be directly connected or coupled to said other component, but that there may also be new other components between said component and said other component. In addition, when it is said that a component is “directly connected” or “directly coupled” to another component, it should be understood that no new component exists between said component and said other component.
The terms first, second, etc. used in the disclosure may be used to describe various components, but the components should not be limited by terms. The terms are used only for the purpose of distinguishing one component from other components.
The disclosure relates to a piping vibration absorber apparatus having a vibration monitoring system, and more specifically, to a piping vibration absorber apparatus having a vibration monitoring system, in which the piping vibration absorber apparatus may reduce piping vibration using an elastic plate and a mass plate, absorb vibration energy and shock using a wire damper, absorb vibration energy through a vibration damping material and the curvature of the elastic plate, and supply power to a vibration sensor through its own energy harvesting without external power supply such that the state of piping vibrations may be remotely monitored by the vibration monitoring system.
A piping vibration absorber apparatus having a vibration monitoring system according to an embodiment improves disadvantages of a method of reinforcing a pipe support that has been mainly used to reduce vibration of a power plant piping, and strengthens technical details that could not be implemented with conventional vibration absorbers.
The frequency of vibration occurring in a power plant piping is mostly low frequency of 30 Hz or below, and in order to reduce such vibration, a piping vibration absorber apparatus having a vibration monitoring system according to an embodiment may implement a natural frequency as a low frequency through a vibration absorber of a specific shape.
A piping vibration absorber apparatus having a vibration monitoring system according to an embodiment may be easily attached to and detached from a pipe 10 on site while reducing vibration, and it is easy to control the degree of reduction in piping vibration and the natural frequency.
In addition, the piping vibration absorber apparatus having a vibration monitoring system according to the embodiment has a damping function and a shock absorption function to prevent fatigue damage and absorb vibration energy, and may check the vibration trend in real time by supplying power to a vibration sensor through its own energy harvesting without external power supply. Hereinafter, preferred embodiments of the inventive concept are described in detail with reference to the accompanying drawings.
A piping vibration absorber apparatus having a vibration monitoring system according to an embodiment includes a vibration absorber 100. The piping vibration absorber apparatus having a vibration monitoring system according to an embodiment may reduce the vibration of a pipe 10 while the vibration absorber 100 vibrates in reverse phase with the vibration of the pipe 10.
Specifically, as the natural frequency of the vibration absorber 100 is adjusted, the vibration absorber 100 may be vibrated in reverse phase with the vibration of the pipe 10, thereby reducing the vibration of the pipe 10.
In the piping vibration absorber apparatus having a vibration monitoring system according to the embodiment, one vibration absorber 100 may be provided, or a plurality of vibration absorbers 100 may be provided.
The plurality of vibration absorbers 100 provided in the piping vibration absorber apparatus having a vibration monitoring system according to an embodiment have the same configuration, but only the natural frequencies of the plurality of vibration absorbers 100 may be differently adjusted. Hereinafter, the vibration absorber 100 is described in detail.
The vibration absorber 100 according to an embodiment includes an elastic plate 110, a mass plate 120, and a wire damper 130.
Referring to
Referring to
Specifically, the mass plate 120 is made of a designated mass, and the vibration absorber 100 is provided with a plurality of mass plates 120, and plurality of mass plates 120 may be stacked on the elastic plate 110.
According to an embodiment, the natural frequency of the vibration absorber 100 may be adjusted by adjusting the number of mass plates 120 stacked on the elastic plate 110, and thus the degree of reduction of vibration generated in the pipe 10 may be adjusted.
As will be described later, the natural frequency of the vibration absorber 100 may be also adjusted by adjusting the position where the mass plate 120 is coupled to the elastic plate 110 through a slot 115 provided on the elastic plate 110.
Referring to
One side of the elastic plate 110 may be fixedly coupled to the pipe 10, and the other side of the elastic plate 110 may be spaced apart from the pipe 10 by a designated distance. In this way, one side of the elastic plate 110 is fixedly coupled to the pipe 10, and the other side of the elastic plate 110 is spaced apart by a designated distance in the pipe 10, so that the elastic plate 110 is formed in a cantilever shape.
The wire damper 130 is coupled to the other side of the elastic plate 110 and extends to the pipe 10. Specifically, one side of the steel wire 131 provided in the wire damper 130 may be coupled to the other side of the elastic plate 110, and the other side of the steel wire 131 provided in the wire damper 130 may be coupled to the pipe 10. In this way, the other side of the elastic plate 110 may be connected to the pipe 10 through the wire damper 130.
One side of the elastic plate 110 according to an embodiment may be coupled to the pipe 10 through a first clamp 20, and the wire damper 130 may be coupled to the pipe 10 through a second clamp 30.
Referring to
The first clamp 20 may be coupled to the pipe 10 at one side of the elastic plate 110. The first clamp 20 includes a plurality of clamps having a semicircular shape or an arc shape, and the first clamp 20 including the plurality of clamps may be coupled to the outside of the pipe 10.
The plurality of clamps included in the first clamp 20 may be coupled to each other through a bolt 60 and a nut 70. The first clamp 20 may be coupled to the outside of the pipe 10 by arranging the plurality of clamps on the outside of the pipe 10 and combining the plurality of clamps through the bolt 60 and the nut 70.
The second clamp 30 may be coupled to the pipe 10 at the other side of the elastic plate 110. The second clamp 30 includes a plurality of clamps having a semicircular shape or an arc shape, and the second clamp 30 including the plurality of clamps may be coupled to the outside of the pipe 10.
The plurality of clamps included in the second clamp 30 may be coupled to each other through a bolt 60 and a nut 70. The second clamp 30 may be coupled to the outside of the pipe 10 by arranging the plurality of clamps on the outside of the pipe 10 and combining the plurality of clamps through the bolt 60 and the nut 70.
According to an embodiment, one side of the elastic plate 110 may be coupled to the first clamp 20, and the other side of the elastic plate 110 may be connected to the second clamp 30 through the wire damper 130.
The first clamp 20 according to an embodiment may include a first saddle 40, and the second clamp 30 may include a second saddle 50. Referring to
Referring to
According to an embodiment, one side of the elastic plate 110 may be fixed to the first saddle 40, and the steel wire 131 of the wire damper 130 may be fixed to the second saddle 50.
Referring to
Specifically, the wire fixing unit 132 may have a semicircular cross section, and the steel wire 131 may be arranged inside the wire fixing unit 132 having a semicircular shape. The second saddle 50 may be provided with a bolt hole into which a wire fixing unit bolt 133 may be inserted, and the wire fixing unit 132 may be fixed to the second saddle 50 through the wire fixing unit bolt 133.
When the steel wire 131 is arranged inside the wire fixing unit 132, and the wire fixing unit 132 is fixed to the second saddle 50, the steel wire 131 may be fixed to the second saddle 50.
In addition, another wire fixing unit 132 for fixing the steel wire 131 may be provided in the bottom of the other side of the elastic plate 110 according to the embodiment. Referring to
Specifically, the wire fixing unit 132 may have a semicircular cross section, and the steel wire 131 may be arranged inside the wire fixing unit 132 having a semicircular shape. A bolt hole into which the wire fixing unit bolt 133 may be inserted may be provided in the bottom of the other side of the elastic plate 110, and the wire fixing unit 132 may be fixed to the other side of the elastic plate 110 through the wire fixing unit bolt 133.
When the steel wire 131 is arranged inside the wire fixing unit 132, and the wire fixing unit 132 is fixed to the other side of the elastic plate 110, the steel wire 131 may be fixed to the other side of the elastic plate 110.
In this way, by fixing the steel wire 131 to the other side of the elastic plate 110 and the second saddle 50, the other side of the elastic plate 110 and the second saddle 50 may be connected by means of the steel wire 131.
According to an embodiment, the steel wire 131 is formed in a U-shape and may be coupled to the wire fixing unit 132 provided in each of the other side of the elastic plate 110 and the second saddle 50. Specifically, the steel wire 131 may extend in a U-shape and connect the other side of the elastic plate 110 with the second saddle 50.
Referring to
The wire damper 130 performs a damping function and an impact absorbing function when vibration occurs in the elastic plate 110. The steel wire 131 may be manufactured by twisting several strands of thin steel wires, and the vibration displacement of the elastic plate 110 may be reduced due to the damping effect due to the stiffness of the steel wire 131 provided in the wire damper 130.
As the vibration displacement of the elastic plate 110 is reduced through the steel wire 131, fatigue damage of the elastic plate 110 may be prevented. In addition, as the vibration displacement of the elastic plate 110 is reduced through the steel wire 131, a shock absorption function may be performed to prevent mutual damage applied to the pipe 10 and the vibration absorber 100 caused by excessive displacement generated due to an impact load.
In addition, the plurality of steel wires 131 provided in the wire damper 130 have elasticity and damping functions with respect to bending, and may work as a damping function by absorbing vibration energy due to the stiffness and damping effect of the plurality of steel wires 131.
According to an embodiment, the length of the steel wire 131 extending from the wire fixing unit 132 to the other side of the elastic plate 110 may be adjusted by adjusting the position where the steel wire 131 is fixed to the wire fixing unit 132 provided in the second saddle 50.
Specifically, the length of the steel wire 131 extending from the other side of the elastic plate 110 to the second saddle 50 may be changed according to the position where the steel wire 131 is fixed to the wire fixing unit 132 provided in the second saddle 50.
Referring to
Referring to
The fixing part 111 is coupled to the first clamp 20, and the fixing part 111 may have a flat plate shape. The fixing part 111 is provided on one side of the elastic plate 110, and the fixing part 111 may be a part coupled to the first clamp 20.
According to an embodiment, the fixing part 111 may be coupled to the first saddle 40 provided in the first clamp 20. A bolt hole for inserting the fixing bolt 116 may be provided in the first saddle 40, and the fixing part 111 may be coupled to the first saddle 40 through the fixing bolt 116 after the fixing part 111 is seated on the first saddle 40.
Referring to
Referring to
The wire damper 130 may be coupled to the first flat plate part 113. Specifically, the wire fixing unit 132 for fixing the steel wire 131 may be provided in the bottom of the first flat plate part 113, and the steel wire 131 may be coupled to the lower part of the first flat plate part 113 through the wire fixing unit 132.
The curvature part 112 connects the second plate part 114 with the first plate part 113 and extends while forming a curvature. The curvature part 112 may be provided between the second plate part 114 and the first plate part 113, and the curvature part 112 may be formed in a curved plate shape.
Referring to
The elastic plate 110 according to an embodiment may increase flexibility through the curvature part 112. The curvature part 112 is a section having higher flexibility than the second flat part 114 and the first flat part 113, and the flexibility of the elastic plate 110 may be increased as the curvature part 112 is provided on the elastic plate 110.
Referring to
Specifically, in the case of the curved part 112, the curvature may occur only one time as shown in
The vibration absorber 100 according to an embodiment may include a plurality of elastic plates 110. The vibration absorber 100 may use a combined elastic plate including the plurality of elastic plates 110, and the vibration absorber 100 may reduce the vibration of the pipe 10 through the combined elastic plate including the plurality of elastic plates 110.
Specifically, the vibration absorber 100 may adjust the natural frequency of the combined elastic plate so that the combined elastic plate may vibrate in reverse phase with the vibration of the pipe 10, thereby reducing the vibration of the pipe 10.
The combined elastic plate may be the plurality of elastic plates 110 stacked. According to an embodiment, as shown in
However, the vibration absorber 100 is not limited to including the first elastic plate 110a, the second elastic plate 110b, and the third elastic plate 110c, and the number of the elastic plates 110 included in the vibration absorber 100 may be changed.
The vibration absorber 100 may adjust the natural frequency of the vibration absorber 100 through the number of stacked elastic plates 110, the shape of the elastic plate 110, the length of the elastic plate 110, and the like.
Referring to
The reinforcing plate 117 connects the lower part of the second flat plate part 114 to the first clamp 20, and the reinforcing plate 117 may connect the lower part of the second flat plate part 114 to the side surface of the first saddle 40 provided in the first clamp 20.
The reinforcing plate 117 may reinforce the second flat plate part 114. The second flat plate part 114 may be a part where alternating stress occurs when vibration occurs in the elastic plate 110, and thus the second flat plate part 114 may be vulnerable to fatigue damage.
The reinforcing plate 117 is for reinforcing the second flat plate part 114, and the reinforcing plate 117 may be connected to the side surface of the first saddle 40 while extending in a curved shape from the lower part of the second flat plate part 114.
According to an embodiment, the reinforcing plate 117 may be formed in a curved shape, and a plurality of reinforcing plates 117 may reinforce the front part of the second flat plate part 114.
Referring to
The vibration damping materials 140 may be provided between the elastic plates 110, on the top portion of the elastic plates 110, and the bottom portion of the elastic plates 110, and may increase a damping value of the combined elastic plate through the vibration damping materials 140.
As the damping value of the combined elastic plate is increased through the vibration damping materials 140, vibration displacement during vibration of the combined elastic plate may be reduced to prevent fatigue damage of the combined elastic plate. In addition, vibration energy may be absorbed by increasing the damping value of the combined elastic plate through the vibration damping materials 140, which may perform a damping function.
The vibration damping materials 140 according to an embodiment may include a material that may be deformed as the combined elastic plate vibrates. The vibration damping materials 140 may be deformed by the vibration of the combined elastic plate to thereby absorb vibration, and the vibration damping materials 140 may perform a damping function absorbing vibration energy and converting the absorbed vibration energy into thermal energy through deformation.
In addition, the vibration damping materials 140 according to the embodiment may widen the frequency range in which resonance occurs by increasing the damping value of the combined elastic plate, thereby easily adjusting the natural frequency of the combined elastic plate to match the vibration frequency of the pipe 10.
Referring to
The vibration damping materials 140 may be provided between the plurality of first flat plate parts 113, the plurality of second flat plate parts 114, and the plurality of the curvature part 112 according to an embodiment, but the spacers 141 instead of the vibration damping materials 140 may be provided between the plurality of fixing parts 111.
Referring to
The spacers 141 are to firmly fix the fixing part 111 to the first saddle 40 while preventing a gap between the plurality of fixing parts 111 provided on the combined elastic plate. In addition, the vibration damping materials 140 installed between the plurality of second flat plate parts 114 may be prevented from being excessively compressed through the spacers 141.
Referring to
According to an embodiment, the number of mass plates 120 installed on the elastic plate 110 may be four. Specifically, the mass plate 120 may include a first mass plate 120a, a second mass plate 120b, a third mass plate 120c, and a fourth mass plate 120d.
However, the number of mass plates 120 installed on the elastic plate 110 is not limited to four, and the number of mass plates 120 installed on the elastic plate 110 may be changed to adjust the natural frequency of the vibration absorber 100.
Referring to
The eye bolt 121 is for installing the plurality of mass plates 120 on the elastic plate 110, and the eye bolt 121 may be inserted into the elastic plate 110 through the mass plate 120.
The nut 122 is fastened to the eye bolt 121, and the mass plate 120 and the elastic plate 110 may be integrated by inserting the eye bolt 121 into the plurality of mass plates 120 and fastening the nut 122.
According to an embodiment, the eye bolt 121 may be provided with a ring 123. The ring 123 may connect the eye bolt 121 to a fixed point, and a steel wire may be connected to the ring 123.
Specifically, the steel wire connected to the ring 123 may be connected to a rigid structure or the first clamp 20. In this way, when the eye bolt 121 is connected to a rigid structure or the first clamp 20 through the ring 123, it is possible to prevent damage to surrounding facilities by separating the mass plate 120 from the elastic plate 110 due to fatigue damage.
However, when connecting the ring 123 with a rigid structure or the first clamp 20 through a steel wire, it is preferable that the steel wire is loosely connected only to the extent that the steel wire does not affect the natural frequency of the vibration absorber 100.
Referring to
The slot 115 may allow the eye bolt 121 to be inserted, and the eye bolt 121 may be inserted into the slot 115 through the mass plate 120.
The slot 115 extends in the longitudinal direction, and the eye bolt 121 may move in the direction in which the slot 115 extends. When the nut 122 is coupled to the eye bolt 121 after moving the eye bolt 121 along the slot 115, the position of the eye bolt 121 may be fixed. When the position of the eye bolt 121 is fixed, the position of the mass plate 120 may also be fixed.
Referring to
According to an embodiment, when the position of the mass plate 120 installed on the elastic plate 110 is adjusted through the slot 115, the natural frequency of the vibration absorber 100 may be adjusted.
As described above, the vibration absorber 100 according to the embodiment may adjust the natural frequency by adjusting the number of elastic plates 110 stacked, the shape of the elastic plates 110, the length of the elastic plates 110, the number of mass plates 120 stacked, and the position where the mass plates 120 are installed on the elastic plates 110.
In addition, the vibration absorber 100 according to the embodiment may adjust the natural frequency by adjusting the number of steel wires 131 provided in the wire damper 130 and the length of the steel wire 131 extending from the other side of the elastic plate 110 to the second saddle 50.
In this way, as the natural frequency may be easily adjusted through the vibration absorber 100, the natural frequency of the vibration absorber 100 may be accurately adjusted to correspond to the vibration frequency of the pipe 10. In addition, the degree of reduction in piping vibration may be adjusted as the natural frequency may be easily adjusted through the vibration absorber 100.
The bolt and the nut used in the embodiment described above may include a washer for preventing loosening.
Referring to
The vibration sensor 160 may measure the vibration of the elastic plate 110, and the vibration sensor 160 may be installed in the fixing part 111 of the elastic plate 110. The upper part of the fixing part 111 is formed as a flat surface so that the vibration sensor 160 may be seated thereon, and the vibration sensor 160 may be fixed to the fixing part 111.
The fixing part 111 may be installed to be integrated with the pipe 10 and may move in the same manner as the pipe 10. Therefore, when the vibration of the fixing part 111 is measured through the vibration sensor 160, the vibration of the pipe 10 may be measured.
The piezoelectric element 150 supplies power to the vibration sensor 160, and the vibration sensor 160 may receive power through the piezoelectric element 150. The piezoelectric element 150 may convert vibration energy into electrical energy, and may supply power to the vibration sensor 160 in an energy harvesting method through the piezoelectric element 150.
The piezoelectric element 150 may be installed on the elastic plate 110 and connected to the vibration sensor 160 to supply power to the vibration sensor 160. The piezoelectric element 150 according to an embodiment may be installed on the first flat plate part 113 of the elastic plate 110, and the piezoelectric element 150 may include a piezoelectric material that generates an electromotive force by deformation.
When the elastic plate 110 is deformed by vibration, the piezoelectric element 150 may be deformed to accordingly generate an electromotive force. The electromotive force generated by the piezoelectric element 150 may be transmitted to the vibration sensor 160, and the vibration sensor 160 may be operated through the electromotive force.
According to an embodiment, an energy storage module (not shown) for storing electrical energy may be connected to the piezoelectric element 150, and power may be supplied to the vibration sensor 160 through the energy storage module.
Referring to
The monitoring unit 170 is provided outside the vibration absorber 100, and the monitoring unit 170 may include a computer system such as a computer or a mobile device.
The vibration sensor 160 according to an embodiment may include a vibration frequency analyzer (not shown) and a vibration data transmission device (not shown), and the vibration sensor 160 may transmit vibration data to the monitoring unit 170. The vibration sensor 160 may wirelessly transmit vibration data to the monitoring unit 170, and the monitoring unit 170 may receive vibration data from the vibration sensor 160.
The piping vibration absorber apparatus having a vibration monitoring system according to an embodiment supplies power to the vibration sensor 160 through the piezoelectric element 150 and receives vibration data from the vibration sensor 160 through the monitoring unit 170, thereby checking the vibration state of the pipe 10 in real time.
In addition, the piping vibration absorber apparatus having a vibration monitoring system according to an embodiment may check the vibration state of the pipe 10 remotely at a location away from the pipe 10 as data is wirelessly transmitted to the monitoring unit 170 from the vibration sensor 160 while the monitoring unit 170 is provided outside the vibration absorber 100.
According to an embodiment, a plurality of vibration absorbers 100 may be provided. Referring to
When two vibration absorbers 100 are provided in a piping vibration absorber apparatus having a vibration monitoring system according to an embodiment, vibration may be reduced at the same time when two different proximate vibration frequency components such as beats exist.
In addition, when two vibration absorbers 100 are provided in a piping vibration absorber apparatus having a vibration monitoring system according to an embodiment, if the pipe vibration is a single frequency component, the pipe vibration may be reduced by the first vibration absorber 100a, and transient vibration generated after an impact load occurs in the pipe may be reduced by the second vibration absorber 100b.
However, the piping vibration absorber apparatus having a vibration monitoring system according to the embodiment is not limited to including two vibration absorbers 100. The piping vibration absorber apparatus having a vibration monitoring system according to the embodiment may include two or more vibration absorbers 100 when multiple frequencies of pipe vibration exist or as necessary.
For example, referring to
When a plurality of vibration absorbers 100 are provided in a piping vibration absorber apparatus having a vibration monitoring system according to the embodiment, the plurality of vibration absorbers 100 may be arranged side by side around the pipe 10 as shown in
In addition, when the diameter of the pipe 10 according to the embodiment is small, multiple vibration absorbers 100 may be placed above and below the pipe 10 as shown in
Referring to
In addition, referring to
The piping vibration absorber apparatus having a vibration monitoring system described above according to the embodiment has the following effects.
The piping vibration absorber apparatus having a vibration monitoring system according to the embodiment has the advantage of accurately reducing the vibration frequency component of the piping by adjusting the vibration absorber and supplying power to the vibration sensor through its own energy harvesting without external power supply.
In addition, the piping vibration absorber apparatus having a vibration monitoring system according to the embodiment has the advantage of not requiring a separate power supply or battery as power is supplied to the vibration sensor using vibration energy generated by the vibration absorber.
In addition, the piping vibration absorber apparatus having a vibration monitoring system according to the embodiment may remotely monitor piping vibration by transmitting data from the vibration sensor to the monitoring unit, which has the advantage of checking the trend of piping vibration in real time regardless of location.
In addition, the piping vibration absorber apparatus having a vibration monitoring system according to the embodiment has a damping function and a shock absorbing function that prevent fatigue damage to the vibration absorber and absorb vibration energy, so that even if transient vibration and shock occur in the piping, piping vibration absorber apparatus has the advantage of preventing mutual damage to the piping and the vibration absorber.
In addition, the piping vibration absorber apparatus having a vibration monitoring system according to the embodiment has the advantage of contributing to the normal operation and safety of the power plant by reducing the possibility that the piping is damaged by vibration.
In addition, the piping vibration absorber apparatus having a vibration monitoring system according to the embodiment has the advantage of being able to implement a low natural frequency even in a short distance by using a cantilever-shaped elastic plate and a mass plate, and has the advantage of checking the vibration frequency of the piping and adjusting the degree of reduction of piping vibration according to various variables.
In addition, the piping vibration absorber apparatus having a vibration monitoring system according to the embodiment may accurately adjust the natural frequency through the cantilever-shaped elastic plate and the mass plate, thereby improving the effect of reducing vibration frequency components.
In addition, the piping vibration absorber apparatus having a vibration monitoring system according to the embodiment has the advantage of being very useful in power plants in commissioning or commercial operation as piping vibration is effectively reduced when vibration is transmitted to the piping by vibration of an external structure.
In addition, the piping vibration absorber apparatus having a vibration monitoring system according to the embodiment may be easily fastened to and separated from the piping so as to be installed on site only by fastening the piping vibration absorber apparatus on the pipe with the clamp and the bolt, and as the piping vibration absorber apparatus is installed along the axial direction of the piping, the piping vibration absorber apparatus does not require a separate installation space.
In addition, the piping vibration absorber apparatus having a vibration monitoring system according to the embodiment is installed only on the pipe itself without using external structures, and thus, it is easy to install the piping vibration absorber apparatus on-site and is advantageous to optimize piping design by not affecting piping thermal stress.
It should be understood that embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments. While one or more embodiments have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2023-0190360 | Dec 2023 | KR | national |
