CN119023186B - Multi-shaft shock absorber high-frequency characteristic random vibration test bed - Google Patents
Multi-shaft shock absorber high-frequency characteristic random vibration test bed Download PDFInfo
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- CN119023186B CN119023186B CN202411505463.3A CN202411505463A CN119023186B CN 119023186 B CN119023186 B CN 119023186B CN 202411505463 A CN202411505463 A CN 202411505463A CN 119023186 B CN119023186 B CN 119023186B
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 143
- 230000035939 shock Effects 0.000 title claims abstract description 109
- 238000012360 testing method Methods 0.000 title claims abstract description 67
- 230000007246 mechanism Effects 0.000 claims abstract description 38
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000009434 installation Methods 0.000 claims abstract description 16
- 230000004044 response Effects 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 230000006872 improvement Effects 0.000 description 13
- 238000013016 damping Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000003190 viscoelastic substance Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/08—Railway vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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Abstract
本发明公开了一种多轴减振器高频特性随机振动试验台,能够真实的模拟诸如轨道车辆转向架减振器等复杂使用条件下的减振器的振动状态，以便能够开发更准确的减振器动力学模型。包括：底座；振动台，放置于底座上并可相对该底座多向运动；第一振动器、第二振动器和第三振动器；门形框架，固定于底座上并具有分布在振动台两侧的立柱以及安装在这些立柱间且可升降调节的横梁；减振器下部安装及载荷检测机构，用于将被测减振器下端安装连接在振动台上并具有用于检测被测减振器下端载荷的第一载荷传感器；减振器上部安装及载荷检测机构，用于将被测减振器上端安装连接在横梁上并具有用于检测被测减振器上端载荷的第二载荷传感器；减振器形变检测机构。
The present invention discloses a multi-axis shock absorber high-frequency characteristic random vibration test bench, which can truly simulate the vibration state of the shock absorber under complex use conditions such as rail vehicle bogie shock absorber, so as to develop a more accurate shock absorber dynamic model. It includes: a base; a vibration table, which is placed on the base and can move in multiple directions relative to the base; a first vibrator, a second vibrator and a third vibrator; a door-shaped frame, which is fixed on the base and has columns distributed on both sides of the vibration table and a crossbeam installed between these columns and can be raised and lowered; a shock absorber lower installation and load detection mechanism, which is used to install the lower end of the shock absorber to be tested on the vibration table and has a first load sensor for detecting the load on the lower end of the shock absorber to be tested; a shock absorber upper installation and load detection mechanism, which is used to install the upper end of the shock absorber to be tested on the crossbeam and has a second load sensor for detecting the load on the upper end of the shock absorber to be tested; a shock absorber deformation detection mechanism.
Description
Technical Field
The invention relates to the technical field of mechanical simulation (vibration) tests, in particular to a random vibration test bed for high-frequency characteristics of a multi-axis vibration damper.
Background
Railway car truck dampers are mounted between axle boxes and the ends of the truck frame and are an important component of a train suspension. Railway vehicle truck dampers provide stiffness and damping to reduce vibrations and shocks from wheel-rail interfaces. At present, some vehicle system dynamics models have been developed to study the axle box to frame vibration transfer characteristics, where the dynamics model of the shock absorber is often simplified to a Maxwell model. The Maxwell model is a classical viscoelastic material model, which is often used to describe the deformation and recovery behavior of a material or system when subjected to a force, and consists of a spring representing the elastic properties of the material and a damper representing the viscous properties. However, since vibration borne by the railway vehicle bogie damper is affected by various factors such as rail corrugation and wheel polygon, a complex multidirectional vibration is formed, including vertical vibration (up-down direction, perpendicular to the track plane), transverse vibration (left-right direction, parallel to the track plane and perpendicular to the driving direction), and longitudinal vibration (front-back direction, parallel to the track and driving direction), which are often coupled, especially under high-frequency (above 50 Hz) conditions, for example, strong transverse vibration may cause load variation in the vertical direction, and the Maxwell model cannot accurately reflect the stress and motion relationship of the railway vehicle bogie damper.
Disclosure of Invention
The invention aims to provide a multi-axis shock absorber high-frequency characteristic random vibration test bed which can more truly simulate the vibration state of a shock absorber under complex use conditions such as a railway vehicle bogie shock absorber and the like so as to develop a more accurate shock absorber dynamics model.
The invention provides a multi-axis vibration damper high-frequency characteristic random vibration test bed, which comprises a base, a vibration damping device and a vibration damping device, wherein the base is provided with a vibration damping device; the vibration table is arranged on the base and can move in a multidirectional manner relative to the base; the vibration table comprises a base, a first vibrator, a second vibrator, a third vibrator, a door-shaped frame, a lower vibration absorber portion, a first load detection mechanism, a second vibration absorber portion, a third vibration absorber portion, a deformation detection mechanism and a deformation sensor, wherein the base is arranged on the base to drive the vibration table to vibrate in the vertical Z-axis direction, the first vibration absorber is arranged on the base to drive the vibration table to vibrate in the vertical Z-axis direction, the second vibration absorber is arranged on the base to drive the vibration table to vibrate in the horizontal X-axis direction, the third vibration absorber is arranged on the base to drive the vibration table to vibrate in the horizontal Y-axis direction, the door-shaped frame is fixed on the base and provided with upright columns distributed on two sides of the vibration table and a beam which is arranged between the upright columns and can be adjusted in a lifting mode, the lower vibration absorber portion is arranged on the lower portion is used for connecting the lower end of the vibration absorber to the vibration table, the first load sensor used for detecting the lower end of the vibration absorber to be detected to be used for detecting the lower end load of the vibration absorber, the upper end of the vibration absorber is arranged on the beam to be detected, the upper end of the vibration absorber is used for detecting the upper end of the vibration absorber to be detected to be used for detecting the upper end load of the vibration absorber to be detected, the upper end of the vibration absorber to be used for detecting the upper end load of the vibration sensor is used for detecting the upper end load of the vibration absorber to be detected, and the upper end of the vibration absorber to be used for detecting the deformation sensor is arranged on the absorber to be used for detecting the absorber, and the upper end, and the absorber is arranged on the absorber to and the upper and the absorber to and the upper end sensor is used for detecting and used base.
As the improvement and/or the instantiation of the multi-axis shock absorber high-frequency characteristic random vibration test bed, the multi-axis shock absorber high-frequency characteristic random vibration test bed has the further specific scheme that the tested shock absorber is a railway vehicle bogie shock absorber.
As an improvement and/or an instantiation of the multi-axis vibration damper high-frequency characteristic random vibration test stand, the multi-axis vibration damper high-frequency characteristic random vibration test stand is further characterized in that the base is formed by a box body, the first vibrator is sunk in the box body, and the vibration stand, the second vibrator, the third vibrator and the portal frame are all arranged on the top surface of the box body.
As an improvement and/or instantiation of the multi-axis shock absorber high-frequency characteristic random vibration test bed, the multi-axis shock absorber high-frequency characteristic random vibration test bed further comprises a shock absorber lower portion installation and load detection mechanism, wherein the shock absorber lower portion installation and load detection mechanism comprises a first lower connection member, a first load sensor, a first upper connection member and a first upper connection member, the lower portion installation and load detection mechanism is sequentially connected from bottom to top, the lower portion of the first lower connection member is installed and connected on the vibration bed, the upper portion of the first lower connection member is connected with the first load sensor, the lower portion of the first load sensor is connected with the first upper connection member, and the upper portion of the first upper connection member is connected with a lower installation shaft of the tested shock absorber.
As an improvement and/or an instantiation of the multi-axis shock absorber high-frequency characteristic random vibration test stand, the multi-axis shock absorber high-frequency characteristic random vibration test stand further comprises a first lower connecting member, a first flange plate and a second flange plate, wherein the first support portion and the first flange plate are arranged at the bottom of the first support portion, and the first flange plate is connected to the vibration stand through a first bolt.
As an improvement and/or an instantiation of the multi-axis shock absorber high-frequency characteristic random vibration test bed, the multi-axis shock absorber high-frequency characteristic random vibration test bed has the further specific scheme that the first load sensor adopts a strain gauge-based force sensor, and the first load sensor can detect at least axial load in axial load and transverse load.
As an improvement and/or instantiation of the multi-axis shock absorber high-frequency characteristic random vibration test bed, the multi-axis shock absorber high-frequency characteristic random vibration test bed is further characterized in that the first upper connecting component is provided with a first U-shaped support, and two ends of the lower mounting shaft are respectively fixed on two support arms of the first U-shaped support.
As an improvement and/or instantiation of the multi-axis shock absorber high-frequency characteristic random vibration test bed, the multi-axis shock absorber high-frequency characteristic random vibration test bed further comprises a shock absorber upper portion installation and load detection mechanism, wherein the shock absorber upper portion installation and load detection mechanism comprises a second lower connection member, the lower portion of the second lower connection member is connected with an upper installation shaft of the tested shock absorber, the upper portion of the second lower connection member is connected with a second load sensor, the lower portion of the second load sensor is connected with the second lower connection member, the upper portion of the second load sensor is connected with a second upper connection member, the lower portion of the second upper connection member is connected with the second load sensor, and the upper portion of the second upper connection member is connected with the cross beam.
As an improvement and/or instantiation of the multi-axis shock absorber high-frequency characteristic random vibration test bed, the multi-axis shock absorber high-frequency characteristic random vibration test bed is further characterized in that the second lower connecting component is provided with a second U-shaped support, and two ends of the upper mounting shaft are respectively fixed on two support arms of the second U-shaped support.
As an improvement and/or an instantiation of the multi-axis shock absorber high-frequency characteristic random vibration test bed, the multi-axis shock absorber high-frequency characteristic random vibration test bed has the further specific scheme that the second load sensor adopts a strain gauge-based force sensor, and the second load sensor can detect at least axial load in axial load and transverse load.
As an improvement and/or instantiation of the multi-axis shock absorber high-frequency characteristic random vibration test bed, the multi-axis shock absorber high-frequency characteristic random vibration test bed is further characterized in that the second upper connecting component is provided with a second supporting portion and a second flange plate positioned at the top of the second supporting portion, the second flange plate is connected with a third flange plate through a second bolt, a screw rod is assembled in the third flange plate, a threaded portion of the screw rod is matched with a vertical screw hole in the cross beam, a head flange portion of the screw rod is assembled and tightly pressed between the second flange plate and the third flange plate, and a locking nut positioned between the cross beam and the third flange plate is further installed on the threaded portion of the screw rod and locks the screw rod in the vertical screw hole.
As an improvement and/or an instantiation of the multi-axis shock absorber high-frequency characteristic random vibration test bed, the shock absorber deformation detection mechanism comprises a short axis, a long axis, a linear variable differential transformer and a linear variable differential transformer, wherein the short axis is arranged in parallel with the shock absorber to be detected, the lower end of the short axis is arranged on the shock absorber lower part installation and load detection mechanism, the upper end of the short axis is provided with a coil part of the linear variable differential transformer, the long axis is arranged in parallel with the shock absorber to be detected, the upper end of the long axis is arranged on the shock absorber upper part installation and load detection mechanism, the lower end of the long axis is provided with an iron core part of the linear variable differential transformer, and the linear variable differential transformer comprises the coil part and the iron core part, and the iron core part is inserted into the coil part so as to form the deformation sensor.
As the improvement and/or the instantiation of the multi-axis shock absorber high-frequency characteristic random vibration test bed, the multi-axis shock absorber high-frequency characteristic random vibration test bed has the further specific scheme that each upright post of the portal frame is provided with a thread section, the cross beam is provided with a sleeve corresponding to each upright post one by one, and each sleeve is sleeved on the thread section of the corresponding upright post and is fixed on the thread section through positioning nuts assembled on the thread section and positioned at two ends of the sleeve.
As the improvement and/or the instantiation of the multi-axis shock absorber high-frequency characteristic random vibration test bed, the multi-axis shock absorber high-frequency characteristic random vibration test bed has the further specific scheme that the tested shock absorber is a railway vehicle bogie shock absorber.
The multi-axis shock absorber high frequency characteristic random vibration test bed can simulate and measure complex vibration responses of the shock absorber in three directions (vertical Z axis, horizontal X axis and horizontal Y axis) at the same time, which is in high agreement with a multidirectional coupling vibration environment such as that faced by a railway vehicle bogie shock absorber. The multi-axis vibration damper high-frequency characteristic random vibration test bed also adopts the first load sensor, the second load sensor and the deformation sensor, and can comprehensively capture the dynamic response of the tested vibration damper under the multidirectional vibration, including the force transmission and the vibration damper deformation characteristic, so as to form a force-deformation curve. The design of the portal frame provides excellent supporting rigidity and stability, ensures the accuracy of test results, and the liftable and adjustable cross beam increases the flexibility of the test and is suitable for shock absorbers with different sizes. In conclusion, the multi-axis shock absorber high-frequency characteristic random vibration test bed can provide comprehensive and accurate testing capability, provides a solid experimental foundation for developing a more accurate shock absorber dynamics model, and is beneficial to breaking through the limitation of the traditional Maxwell model.
The invention is further described below with reference to the drawings and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the invention and, together with the description, serve to explain the principles of the invention.
FIG. 1 is a block diagram of a multi-axis shock absorber high frequency characteristic random vibration test stand according to an embodiment of the invention.
FIG. 2 is a block diagram of the portion of the shock absorber portion under test of FIG. 1.
Figure 3 is a cross-sectional view of a portion of a shock absorber under test.
Fig. 4 is a photograph of an actual use of a railway car truck damper.
Fig. 5 is a photograph showing the actual use of the random vibration test stand of the high frequency characteristic of the multi-axis vibration damper shown in fig. 1.
The vibration damper for the railway vehicle bogie is shown as a vibration damper 1, a base 21, a vibrating table 22, a first vibrator 23, a second vibrator 24, a third vibrator 25, a portal frame 26, a column 261, a cross beam 262, a lower vibration damper mounting and load detecting mechanism 27, a first load sensor 271, a first flange 272, a first U-shaped support 273, an upper vibration damper mounting and load detecting mechanism 28, a second load sensor 281, a second U-shaped support 282, a second flange 283, a third flange 284, a lock nut 285, a screw 286, a vibration damper deformation detecting mechanism 29, a long shaft 291, a short shaft 292, a linear variable differential transformer 293, a lower mounting shaft 11, and an upper mounting shaft 12.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be noted in particular that:
The technical solutions and technical features provided in the respective sections including the following description may be combined with each other without conflict. Furthermore, the described embodiments, features, and combinations of features can be combined as desired and claimed in any given application.
The embodiments of the invention that are referred to in the following description are typically only a few, but not all, embodiments, based on which all other embodiments, as would be apparent to one of ordinary skill in the art without the benefit of the present disclosure, are intended to be within the scope of the patent protection.
With respect to terms and units in this specification, the terms "comprising," "including," "having," and any variations thereof, in this specification and the corresponding claims and related parts, are intended to cover a non-exclusive inclusion. Furthermore, other related terms and units may be reasonably construed based on the description provided herein.
Fig. 4 is a photograph of an actual use of a railway car truck damper. The railway vehicle bogie damper 1 is mounted between the axlebox and the bogie frame end and is an important component of a train suspension. The railway vehicle truck damper 1 provides stiffness and damping to reduce vibrations and shocks from the wheel-rail interface. At present, some vehicle system dynamics models have been developed to study the axle box to frame vibration transfer characteristics, where the dynamics model of the shock absorber is often simplified to a Maxwell model. The Maxwell model is a classical viscoelastic material model, which is often used to describe the deformation and recovery behavior of a material or system when subjected to a force, and consists of a spring representing the elastic properties of the material and a damper representing the viscous properties. However, since the vibration borne by the railway vehicle bogie vibration damper 1 is affected by various factors such as rail wave abrasion and wheel polygon, a complex multidirectional vibration is formed, including vertical vibration (up-down direction, perpendicular to the track plane), lateral vibration (left-right direction, parallel to the track plane and perpendicular to the running direction), and longitudinal vibration (front-back direction, parallel to the track and running direction), which are often coupled, especially under high frequency (above 50 Hz) conditions, for example, strong lateral vibration may cause load variation in the vertical direction, and the Maxwell model cannot accurately reflect the stress and motion relationship of the railway vehicle bogie vibration damper 1.
FIG. 1 is a block diagram of a multi-axis shock absorber high frequency characteristic random vibration test stand according to an embodiment of the invention. FIG. 2 is a block diagram of the portion of the shock absorber portion under test of FIG. 1. Figure 3 is a cross-sectional view of a portion of a shock absorber under test. Fig. 5 is a photograph showing the actual use of the random vibration test stand of the high frequency characteristic of the multi-axis vibration damper shown in fig. 1. As shown in fig. 1 to 3 and 5, a multi-axis vibration damper high frequency characteristic random vibration test stand includes a base 21; the vibration absorber comprises a base 21, a vibration table 22, a first vibrator 23, a second vibrator 24, a third vibrator 25, a door-shaped frame 26, a lower vibration absorber part mounting and load detecting mechanism 27, a first load sensor 271, a second load sensor 281, a deformation detecting mechanism 29 and a deformation detecting mechanism, wherein the base 21 is arranged on the base 21 and can move in a multidirectional mode relative to the base 21, the first vibrator 23 is arranged on the base 21 and can drive the vibration table 22 to vibrate in a vertical Z-axis direction, the second vibrator 24 is arranged on the base 21 and can drive the vibration table 22 to vibrate in a horizontal X-axis direction, the third vibrator 25 is arranged on the base 21 and can drive the vibration table 22 to vibrate in a horizontal Y-axis direction, the door-shaped frame 26 is fixed on the base 21 and is provided with upright posts 261 distributed on two sides of the vibration table and a beam 262 which is arranged between the upright posts 261 and can be adjusted in a lifting mode, the lower vibration absorber part mounting and load detecting mechanism 27 is used for mounting and connecting the lower end of the vibration absorber to the vibration table 22 and is provided with a first load sensor 271 used for detecting the lower end load of the vibration absorber, the vibration absorber upper part mounting and a second load detecting mechanism 28 is used for connecting the upper end of the vibration absorber to vibrate in the horizontal X-axis direction, the vibration table 22 is used for detecting the upper end load of the vibration absorber, the vibration absorber mounting and the second load sensor is used for detecting deformation detecting the upper end load of the vibration absorber, the vibration absorber is arranged on the vibration absorber, and the vibration absorber is arranged correspondingly to be arranged. The measured shock absorber is a railway vehicle bogie shock absorber 1.
The multi-axis shock absorber high-frequency characteristic random vibration test bed can simulate and measure complex vibration responses of the railway vehicle bogie shock absorber 1 in three directions (a vertical Z axis, a horizontal X axis and a horizontal Y axis respectively corresponding to vertical vibration, transverse vibration and longitudinal vibration) at the same time, and is in high coincidence with a multidirectional coupling vibration environment faced by the railway vehicle bogie shock absorber 1. The multi-axis shock absorber high-frequency characteristic random vibration test bed also adopts a first load sensor 271, a second load sensor 281 and a deformation sensor, and can comprehensively capture the dynamic response of the railway vehicle bogie shock absorber 1 under multidirectional vibration, including force transmission and shock absorber deformation characteristics, so as to form a force-deformation curve. In addition, the design of the portal frame 26 provides excellent support stiffness and stability, meets rail vehicle truck damper 1 installation requirements, ensures accuracy of test results, and the liftable and adjustable cross beam 262 increases flexibility of the test, adapting to rail vehicle truck dampers 1 of different sizes. In conclusion, the multi-axis shock absorber high-frequency characteristic random vibration test bed can provide comprehensive and accurate testing capability, provides a solid experimental foundation for developing a more accurate shock absorber dynamics model, and is beneficial to breaking through the limitation of the traditional Maxwell model.
Specifically, as shown in fig. 1, in the present embodiment, the base 21 is formed of a case in which the first vibrator 23 is sunk, and the vibration table 22, the second vibrator 24, the third vibrator 25, and the gate-shaped frame 26 are all mounted on the top surface of the case. The box body provides higher rigidity and stability, can effectively resist various vibration and stress generated in the vibration test process, ensures stable operation of the whole multi-axis vibration damper high-frequency characteristic random vibration test bed and accuracy of test results, and allows the first vibrator 23 to be sunk in the box body, so that space utilization is optimized, the whole multi-axis vibration damper high-frequency characteristic random vibration test bed is more compact, and more space is reserved for other equipment and operation.
Specifically, as shown in fig. 1 to 3, in the present embodiment, the damper lower mounting and load detecting mechanism 27 includes a first lower connecting member, the lower portion of which is mounted and connected to the vibration table 22, the upper portion of which is connected to the first load sensor 271, a first load sensor 271, the lower portion of which is connected to the first lower connecting member, the upper portion of which is connected to a first upper connecting member, and a first upper connecting member, the lower portion of which is connected to the first load sensor 271, the upper portion of which is connected to the lower mounting shaft 11 of the measured damper (railway vehicle bogie damper 1).
Wherein, the first lower connecting member has a first supporting portion and a first flange 272 located at the bottom of the first supporting portion, and the first flange 272 is mounted and connected to the vibration table 22 through a first bolt. The first load sensor 271 employs a strain gauge based force sensor capable of detecting at least an axial load of the axial load and the lateral load. The first upper connection member has a first U-shaped support 273, and both ends of the lower mounting shaft 11 are fixed to both arms of the first U-shaped support 273, respectively.
It can be seen that the lower mounting and load detecting mechanism 27 of the shock absorber has the following characteristics and technical advantages that 1) the three main parts, namely the first lower connecting member, the first load sensor 271 and the first upper connecting member, are sequentially connected from bottom to top, and the modular design is convenient for mounting, dismounting and maintenance. 2) The first lower connection member is connected with the vibration table 22 through the first flange 272 and the first bolts, and the first flange 272 and the first bolts ensure firm connection with the vibration table 22, improving the test accuracy. 3) The first load sensor 271 employs a strain gauge based force sensor capable of detecting axial and lateral loads (optional), and capturing the shock absorber stress conditions entirely. 4) The first upper connecting member has a first U-shaped bracket 273, the first U-shaped bracket 273 being easily adaptable to the lower mounting shaft 11 of different types of dampers.
In this embodiment, the upper damper mounting and load detecting mechanism 28 includes a second lower connecting member, a second load sensor 281, a second upper connecting member, and a second upper connecting member, wherein the lower portion of the second lower connecting member is connected to the upper mounting shaft 12 of the damper (railway vehicle bogie damper 1) to be tested, the upper portion of the second lower connecting member is connected to the second load sensor 281, the lower portion of the second load sensor 281 is connected to the second lower connecting member, the upper portion of the second load sensor 281 is connected to the second upper connecting member, the lower portion of the second upper connecting member is connected to the second load sensor, and the upper portion of the second upper connecting member is mounted to the cross beam.
Wherein the second lower connecting member has a second U-shaped support 282, and both ends of the upper mounting shaft 12 are respectively fixed to both arms of the second U-shaped support 282. The second load sensor 281 employs a strain gauge based force sensor, and the second load sensor 281 is capable of detecting at least an axial load of an axial load and a lateral load. The second upper connecting member is provided with a second supporting part and a second flange 283 positioned at the top of the second supporting part, the second flange 283 is connected with a third flange 284 through a second bolt, a screw 286 is assembled on the third flange 284, a threaded part of the screw 286 is matched with a vertical screw hole in the cross beam 262, a head flange part of the screw 286 is assembled and tightly pressed between the second flange 283 and the third flange 284, a locking nut 285 positioned between the cross beam 262 and the third flange 284 is also installed on the threaded part of the screw 286, and the locking nut 285 locks the screw 286 in the vertical screw hole.
The design of the damper upper mounting and load detection mechanism 28 embodies a combination of modularity, accuracy and flexibility. Its modular construction (second lower connection member, second load sensor 281, second upper connection member) facilitates installation and maintenance. The second U-shaped support 282 accommodates the upper mounting shaft 12 of different types of shock absorbers while the strain gauge based second load sensor 281 provides high accuracy axial and lateral load (optional) measurements. The most remarkable characteristic is that the upper mounting and load detecting mechanism 28 of the shock absorber is connected with the cross beam 262 in a manner that the combination of the screw 286, the lock nut 285 and the multi-layer flange plates (the second flange plate 283 and the third flange plate 284) realizes the height adjustability and allows a certain position offset error between the screw 286 and the second U-shaped support 282.
In this embodiment, as shown in fig. 1-3, the damper deformation detecting mechanism 29 includes a short shaft 292 disposed parallel to the damper under test, the short shaft having a lower end mounted on the damper lower mounting and load detecting mechanism and an upper end provided with a coil portion of a linear variable differential transformer, a long shaft 291 disposed parallel to the damper under test, the long shaft having an upper end mounted on the damper upper mounting and load detecting mechanism and a lower end provided with a core portion of a linear variable differential transformer, and a linear variable differential transformer 293 including the coil portion and the core portion, the core portion being inserted into the coil portion to form the deformation sensor. The deformation detection mechanism 29 of the vibration damper can accurately measure the deformation of the vibration damper to be measured through the linear variable differential transformer 293, continuously record the deformation condition of the vibration damper to be measured under different vibration conditions, and provide key data for evaluating the dynamic response and performance of the vibration damper to be measured.
In addition, as shown in fig. 1, in this embodiment, each upright of the portal frame 26 is provided with a threaded section, the cross beam has sleeves corresponding to each upright one by one, and each sleeve is sleeved on the threaded section of the corresponding upright and fixed on the threaded section by positioning nuts assembled on the threaded section and located at both ends of the sleeve. Therefore, the flexible adjustment and firm fixation of the height position of the cross beam are realized through the matching of the threaded section, the sleeve and the positioning nut on the upright post.
The content of the present invention is described above. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Based on the foregoing specification, all other embodiments that may be obtained by one of ordinary skill in the art without making any inventive effort are intended to be within the scope of patent protection.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411505463.3A CN119023186B (en) | 2024-10-28 | 2024-10-28 | Multi-shaft shock absorber high-frequency characteristic random vibration test bed |
Applications Claiming Priority (1)
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| JP2012159476A (en) * | 2011-02-02 | 2012-08-23 | Toyota Motor Corp | Vibration testing system |
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| JP3607805B2 (en) * | 1997-12-08 | 2005-01-05 | カヤバ工業株式会社 | Single-wheel model suspension test equipment |
| JP2007212383A (en) * | 2006-02-13 | 2007-08-23 | Bridgestone Corp | Vibrator of hydraulic buffer |
| JP5190864B2 (en) * | 2007-08-06 | 2013-04-24 | カヤバ工業株式会社 | Railway vehicle vibration control device |
| CN205843953U (en) * | 2016-06-30 | 2016-12-28 | 华南理工大学 | A kind of simulation harmonic speed reducer vibration fault detection platform |
| CN108956067B (en) * | 2018-04-02 | 2020-09-11 | 上海工程技术大学 | A rolling vibration test bench for simulating the wheel-rail relationship of rail transit |
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| CN117091787A (en) * | 2023-10-18 | 2023-11-21 | 济南市人民医院 | Breathing machine vibration experiment box with road condition vibration simulation function |
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| CN101241036A (en) * | 2008-03-21 | 2008-08-13 | 苏州东菱振动试验仪器有限公司 | Jigging platform three-way excitation platform connecting mechanism |
| JP2012159476A (en) * | 2011-02-02 | 2012-08-23 | Toyota Motor Corp | Vibration testing system |
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