A mechanical impedance testing device for elastic elements capable of applying three-way coupled pre-deformation

Abstract

The present application provides a mechanical impedance testing device for an elastic element capable of applying three-way coupled pre-deformation, wherein a limiting mechanism is arranged around the circumference of the elastic element; an input force measuring mechanism is mounted on the top of the elastic element for measuring the input end force of the elastic element; an axial pre-deformation decoupling mechanism is mounted on the top of the input force measuring mechanism for applying axial static pre-deformation to the elastic element and performing dynamic decoupling between the elastic element and the limiting mechanism; two sets of radial pre-deformation decoupling mechanisms are respectively arranged on both sides of the bottom of the axial pre-deformation decoupling mechanism and mounted on the limiting mechanism for applying radial static pre-deformation to the elastic element and performing dynamic decoupling between the elastic element and the limiting mechanism; the elastic element is mounted on the output force measuring mechanism, and the output force measuring mechanism is used to measure the output end force of the elastic element. The device can accurately and efficiently test the mechanical impedance characteristics of the elastic element under different displacement pre-deformations and different internal pressures.

Description

Technical Field

[0001] The present application relates to the field of mechanical equipment, and in particular to a mechanical impedance testing device for elastic elements capable of applying three-way coupled pre-deformation. Background Art

[0002] With the rapid development of modern mechanical technology, elastic elements are increasingly used in various types of mechanical equipment. In practice, elastic elements often need to operate under abnormal design conditions (deformation) and varying internal pressures. Currently, there is a lack of tooling design methods for testing the mechanical impedance of pre-deformed elastic elements under varying internal pressures. Furthermore, since elastic elements can become unstable or deform when subjected to pressure in abnormal design conditions (deformation), it is necessary to appropriately limit their position without affecting the mechanical impedance measurement.

[0003] However, there are currently technical difficulties in testing the mechanical impedance of elastic elements under different internal pressures under pre-deformation. That is, traditional testing methods cannot solve the problem of instability of elastic elements after pre-deformation and pressure, and it is difficult to meet the needs of modern mechanical impedance testing. Summary of the Invention

[0004] One of the purposes of the present application is to provide a mechanical impedance testing device for elastic elements that can apply three-way coupled pre-deformation, which solves the technical difficulties of mechanical impedance testing of elastic elements with different internal pressures under pre-deformation. Through this device, the mechanical impedance of elastic elements with different internal pressures under pre-deformation can be effectively measured to meet the requirements of reliability and accuracy of mechanical impedance testing of elastic elements with different internal pressures under pre-deformation.

[0005] The technical solution of this application is:

[0006] A mechanical impedance testing device for an elastic element capable of applying three-way coupled pre-deformation comprises a limiting mechanism, an input force measuring mechanism, an axial pre-deformation decoupling mechanism, two sets of radial pre-deformation decoupling mechanisms, an elastic element, and an output force measuring mechanism; the limiting mechanism is arranged around the circumference of the elastic element for limiting the elastic element; the input force measuring mechanism is mounted on the top of the elastic element for measuring the input end force of the elastic element; the axial pre-deformation decoupling mechanism is mounted on the top of the input force measuring mechanism for applying axial static pre-deformation to the elastic element and performing dynamic decoupling between the elastic element and the limiting mechanism; the two sets of radial pre-deformation decoupling mechanisms are mounted on the limiting mechanism and are respectively arranged on both sides of the bottom of the axial pre-deformation decoupling mechanism for applying radial static pre-deformation to the elastic element and performing dynamic decoupling between the elastic element and the limiting mechanism; the elastic element is mounted on the output force measuring mechanism, and the output force measuring mechanism is used to measure the output end force of the elastic element.

[0007] As a technical solution of the present application, the limiting mechanism includes two groups of T-shaped connecting frames; the two groups of T-shaped connecting frames are symmetrically arranged horizontally, and each end of the T-shaped connecting frame is connected to a vertically arranged limiting frame; each of the limiting frames is installed on a limiting base plate; multiple limiting base plates are arranged around the output force measuring mechanism; multiple limiting frames are arranged around the elastic element.

[0008] As a technical solution of the present application, the axial pre-deformation decoupling mechanism includes a first force uniformly distributing plate, an acceleration sensor, multiple first support seats, multiple first airbags, multiple first bolts, a square positioning plate and an adapter frame; the first force uniformly distributing plate is installed on the top of the input force measuring mechanism, and an excitation hole connected to the exciter is opened at the center and on each side wall, and the exciter is used to provide axial or radial excitation to the elastic element; the acceleration sensor is installed on the first force uniformly distributing plate and close to the excitation hole, and the direction of the acceleration sensor is consistent with the excitation direction generated by the exciter, and is used to measure the acceleration response of the input end of the elastic element; The square positioning plate is arranged in parallel and at intervals directly above the first force uniformly distributing plate; a plurality of first support seats are installed at intervals on the top surface of the first force uniformly distributing plate; the first airbag is installed horizontally between the corresponding first support seat and the square positioning plate, for applying axial static pre-deformation to the elastic element and performing dynamic decoupling between the elastic element and the limiting mechanism; a plurality of first bolts respectively pass through the square positioning plate, and the bottom end extends at an adjustable length close to the top surface of the first force uniformly distributing plate, for axially limiting the elastic element; the adapter frame is installed on the top surface of the square positioning plate and is connected to the limiting mechanism.

[0009] As a technical solution of the present application, the adapter frame includes a square frame and two positioning seats; the square frame is installed on the top surface of the square positioning plate; the two positioning seats are respectively installed on the top of the opposite sides of the square frame, and are respectively connected to the limiting mechanism.

[0010] As a technical solution of the present application, the positioning seat includes multiple reinforcing plates, a bottom plate, a top plate and multiple connecting plates; the multiple reinforcing plates are installed on the top surface of the square positioning plate at intervals, and are all connected to the side walls of the square frame; the bottom plate is installed on the top of the reinforcing plate and one side of the square frame; the top plate is arranged parallel and spaced directly above the bottom plate, and is connected to the limiting mechanism; multiple connecting plates are connected between the bottom plate and the top plate.

[0011] As a technical solution of the present application, the radial pre-deformation decoupling mechanism includes multiple limit seats, bases, multiple second support seats, multiple second bolts and multiple second airbags; the limit seats and the base are respectively installed at intervals on the inner side of the limit mechanism; the second support seat is installed on the bottom end of the axial pre-deformation decoupling mechanism, and is respectively arranged in parallel with the limit seat and the base; a vertical second airbag is installed between the second support seat and the limit seat, and between the second support seat and the base, and the second airbag is used to apply radial static pre-deformation to the elastic element and perform dynamic decoupling between the elastic element and the limit mechanism; multiple second bolts respectively pass through the base and the limit seat, and the end portions extend at an adjustable length close to a side of the second support seat away from the elastic element, and are used to radially limit the elastic element.

[0012] As a technical solution of the present application, the base includes an adjustment plate, a connecting frame and a base plate, the adjustment plate is provided with a plurality of vertically extending strip holes, the adjustment plate is height-adjustably mounted on the limiting mechanism through the strip holes and bolts, the connecting frame is connected between the adjustment plate and the base plate, and a plurality of second bolts are inserted at intervals on the base plate; the limit seat includes a fixed plate, a bracket and a receiving plate, the fixed plate is provided with a plurality of vertically extending strip holes, the fixing plate is height-adjustably mounted on the limiting mechanism through the strip holes and bolts, the bracket is connected between the fixed plate and the receiving plate, and a plurality of second bolts are inserted at intervals on the receiving plate.

[0013] As a technical solution of the present application, the input force measuring mechanism includes a second force balancing plate and a plurality of force sensors; the second force balancing plate is installed on the top of the elastic element; the plurality of force sensors are installed at intervals on the top surface of the second force balancing plate; the axial pre-deformation decoupling mechanism is installed on the top of the plurality of force sensors.

[0014] As a technical solution of the present application, the output force measurement mechanism includes a rigid base, a force measurement platform and an adapter plate connected in sequence from bottom to top; the elastic element is installed on the adapter plate.

[0015] As a technical solution of the present application, an air compressor is also included for inflating the axial pre-deformation decoupling mechanism and the radial pre-deformation decoupling mechanism respectively.

[0016] Beneficial effects of this application:

[0017] The present application discloses a device for testing the mechanical impedance of an elastic element that can apply three-way coupled pre-deformation. It dynamically decouples the mechanical impedance testing system of the elastic element by setting multiple first airbags in an axial pre-deformation decoupling mechanism and multiple second airbags in a radial pre-deformation decoupling mechanism, thereby reducing the lateral vibration caused by the use of static pre-deformation, and ensuring the reliability and accuracy of the data through the transmission of the input force measuring mechanism and the output force measuring mechanism. At the same time, the device coordinates the limiting mechanism, multiple first airbags, and multiple second airbags, which solves the technical difficulties of mechanical impedance testing of elastic elements with different internal pressures under pre-deformation, and can effectively measure the mechanical impedance of elastic elements with different internal pressures under pre-deformation to meet the reliability and accuracy of mechanical impedance testing of elastic elements with different internal pressures under pre-deformation. In addition, the device can simultaneously calculate the origin mechanical impedance and cross-point mechanical impedance of the elastic element through the force at the input end of the elastic element measured by the dynamic force sensor, the force at the output end of the elastic element measured by the force measurement platform, and the displacement at the input end of the elastic element measured by the acceleration sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the following is a brief introduction to the drawings required for use in the implementation methods. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of a mechanical impedance testing device for an elastic element capable of applying three-way coupled pre-deformation provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram from a first angle of the elastic element mechanical impedance testing device capable of applying three-way coupled pre-deformation provided in an embodiment of the present application;

[0021] Figure 3 A second angle diagram of the elastic element mechanical impedance testing device capable of applying three-way coupled pre-deformation provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of the axial pre-deformation decoupling mechanism provided in an embodiment of the present application;

[0023] Figure 5 Schematic diagram of the radial pre-deformation decoupling mechanism provided in an embodiment of the present application;

[0024] Figure 6 A schematic diagram of an input force measurement mechanism provided in an embodiment of the present application;

[0025] Figure 7A schematic diagram of an output force measurement mechanism provided in an embodiment of the present application;

[0026] Figure 8 A schematic diagram of the origin mechanical impedance test process provided in an embodiment of the present application;

[0027] Figure 9 A schematic diagram of the cross-point mechanical impedance test process provided in an embodiment of the present application.

[0028] Icons: 1-limiting mechanism; 2-input force measuring mechanism; 3-axial pre-deformation decoupling mechanism; 4-radial pre-deformation decoupling mechanism; 5-elastic element; 6-output force measuring mechanism; 7-T-type connecting frame; 8-limiting frame; 9-limiting base plate; 10-first force uniformly distributing plate; 11-acceleration sensor; 12-first support seat; 13-first airbag; 14-first bolt; 15-square positioning plate; 16-excitation hole; 17-square frame; 18-positioning seat; 19-limiting seat; 20-base; 21-second support seat; 22-second bolt; 23-second airbag; 24-second force uniformly distributing plate; 25-force sensor; 26-rigid base; 27-force measurement platform; 28-adapter plate. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] In the description of this application, it should be noted that the terms "upper" and "lower" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the invented product is usually placed when in use. These are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0033] In addition, in this application, unless otherwise expressly specified or limited, the phrase "a first feature is above or below a second feature" may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, the phrases "above, above, and above the second feature" may include the first feature being directly above and obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The phrases "below, below, and below the second feature" may include the first feature being directly below and obliquely below the second feature, or simply indicate that the first feature is lower in level than the second feature.

[0034] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0035] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0036] Example:

[0037] Please refer to Figure 1 , with reference Figures 2 to 9The present application provides a mechanical impedance testing device for an elastic element 5 capable of applying three-way coupled pre-deformation, which mainly comprises a limiting mechanism 1, an input force measuring mechanism 2, an axial pre-deformation decoupling mechanism 3, two sets of radial pre-deformation decoupling mechanisms 4, an elastic element 5, an output force measuring mechanism 6 and an air compressor; wherein the limiting mechanism 1 is arranged around the circumference of the elastic element 5, for supporting and limiting the elastic element 5, and connecting the various parts of the testing device; at the same time, the input force measuring mechanism 2 is installed on the top of the elastic element 5, for measuring the input end force of the elastic element 5; and the axial pre-deformation decoupling mechanism 4 is provided. A coupling mechanism 3 is mounted on top of the input force measurement mechanism 2 and is used to apply axial static pre-deformation to the elastic element 5 and dynamically decouple the elastic element 5 from the limiting mechanism 1. Furthermore, two sets of radial pre-deformation decoupling mechanisms 4 are mounted on the limiting mechanism 1 and located on either side of the bottom of the axial pre-deformation decoupling mechanism 3. These mechanisms apply radial static pre-deformation to the elastic element 5 and dynamically decouple the elastic element 5 from the limiting mechanism 1. Furthermore, the elastic element 5 is mounted on an output force measurement mechanism 6, which is used to secure the output end of the elastic element 5 and measure the output force. An air compressor is used to inflate and pressurize the first airbag 13 in the axial pre-deformation decoupling mechanism 3 and the second airbag 23 in the radial pre-deformation decoupling mechanism 4. The elastic element 5 is pressurized using conventional pressurization equipment, which is selected based on the type of elastic element 5 and can be an air compressor or a water pump. This test device has a rational structure and fills a gap in the mechanical impedance testing method for elastic elements 5 under different internal pressures under preload.

[0038] Furthermore, its limiting mechanism 1 includes two groups of T-shaped connecting frames 7; the two groups of T-shaped connecting frames 7 are symmetrically arranged horizontally, and the three ends of the T-shaped connecting frames 7 are connected to vertically arranged limiting frames 8 by multiple bolts; each limiting frame 8 is installed on the limiting base plate 9 by multiple bolts; multiple limiting base plates 9 are all arranged around the rigid base 26 on the output force measuring mechanism 6; multiple limiting frames 8 are all arranged around the elastic element 5.

[0039] At the same time, its axial pre-deformation decoupling mechanism 3 includes a first force balancing plate 10, an acceleration sensor 11, a plurality of first support seats 12, a plurality of first airbags 13, a plurality of first bolts 14, a square positioning plate 15 and an adapter frame; the first force balancing plate 10 is installed on the top of the plurality of force sensors 25 in the input force measurement mechanism 2 through a plurality of bolts, and an excitation hole 16 connected to the exciter is opened at the center thereof, and the exciter is used to provide axial excitation to the elastic element 5, and the first force balancing plate 10 is used to connect the force sensor 25 and make the elastic element 5. The vibration of the input end flange of the first force uniform distribution plate 10 is uniform, and the unidirectional vibration of the input end flange of the elastic element 5 is enhanced. At the same time, an excitation hole is also opened on each side wall of the first force uniform distribution plate 10, which is used to connect with the exciter. The excitation hole here provides radial excitation to the elastic element 5 by connecting the exciter; and the acceleration sensor 11 is installed on the first force uniform distribution plate 10 and close to the excitation hole 16. The direction of the acceleration sensor 11 is consistent with the excitation direction generated by the exciter, and it is used to measure the acceleration response of the input end of the elastic element 5; and the square positioning The plates 15 are arranged in parallel and at intervals just above the first force uniform distribution plate 10; a plurality of first support seats 12 are installed at intervals on the top surface of the first force uniform distribution plate 10; the first airbag 13 is arranged horizontally and installed between the corresponding first support seat 12 and the square positioning plate 15 through a plurality of bolts, and the first airbag 13 is connected to the input end of the elastic element 5 through the square positioning plate 15 and the first force uniform distribution plate 10, which is used to apply axial static pre-deformation to the elastic element 5 and perform dynamic decoupling between the elastic element 5 and the T-shaped connection frame 7; a plurality of first bolts 1 4 are inserted on the square positioning plate 15 at intervals, and their bottom ends pass through the square positioning plate 15 and extend to an adjustable length close to the top surface of the first force uniform distribution plate 10, which is used to axially limit the elastic element 5. The length of the extension of the square positioning plate 15 can be adjusted according to the use requirements. When the end of the adapter frame abuts against the top surface of the first force uniform distribution plate 10, it means that the rated axial displacement of the elastic element 5 has been reached; the adapter frame is installed on the top surface of the square positioning plate 15, and its top surface is connected to the bottom of the T-shaped connection frame 7 through a plurality of bolts.

[0040] The adapter frame includes a square frame 17 and two positioning seats 18; the square frame 17 is installed on the top surface of the square positioning plate 15; the two positioning seats 18 are respectively installed on the top of the opposite sides of the square frame 17, and each positioning seat 18 includes multiple reinforcing plates, a bottom plate, a top plate and multiple connecting plates, and the multiple reinforcing plates are respectively installed on the top surface of the square positioning plate 15 at intervals, and are all connected to the side walls of the square frame 17; the bottom plate is installed on the top of the reinforcing plate and one side of the square frame 17 by multiple bolts; the top plate is arranged parallel and spaced directly above the bottom plate, and a plurality of connecting holes are opened on it, and the top plate is connected to the bottom of the T-shaped connecting frame 7 through the connecting holes and bolts; the multiple connecting plates are respectively connected between the bottom plate and the top plate by multiple bolts.

[0041] In addition, the radial pre-deformation decoupling mechanism 4 includes a plurality of limit seats 19, a base 20, a plurality of second support seats 21, a plurality of second bolts 22 and a plurality of second airbags 23; the limit seats 19 and the base 20 are respectively installed on the inner side of the limit frame 8 at intervals; the base 20 includes an adjustment plate, a connecting frame and a base plate, the adjustment plate is provided with a plurality of vertically extending strip holes, the adjustment plate is height-adjustably mounted on the limit frame 8 through the strip holes and bolts, the connecting frame is connected between the adjustment plate and the base plate, and a plurality of second bolts 22 are inserted at intervals. On the substrate, and the length of its end extending through the substrate can be adjusted to be close to the side of the second support seat 21 away from the elastic element 5, which is used to radially limit the elastic element 5. The length of its extending from the substrate can be adjusted according to the use requirements. When its end abuts against the side of the second support seat 21 away from the elastic element 5, it means that the rated radial displacement of the elastic element 5 has been reached; the limiting seat 19 includes a fixing plate, a bracket and a receiving plate. A plurality of vertically extending strip holes are opened on the fixing plate. The fixing plate is connected to the fixing plate through The strip holes and bolts are height-adjustably mounted on the corresponding limit frame 8, the bracket is connected between the fixed plate and the receiving plate, and a plurality of second bolts 22 are inserted into the receiving plate at intervals, and the length of the end thereof extending can be adjusted to pass through the receiving plate and approach the other side of the second support seat 21 away from the elastic element 5, and is used to radially limit the elastic element 5. The length of the end thereof extending out of the substrate can be adjusted according to the use requirements. When the end thereof abuts against the other side of the second support seat 21 away from the elastic element 5, it indicates that the rated radial displacement of the elastic element 5 has been reached; the second support seat 21 is mounted on the bottom end of the first force uniform distribution plate 10 by a plurality of bolts, and one of its side surfaces is arranged parallel to and spaced apart from the limit seat 19, and the other side surface is arranged parallel to and spaced apart from the base 20; a vertically placed second airbag 23 is installed between the second support seat 21 and the limit seat 19, and between the second support seat 21 and the base 20. The second airbag 23 is used to apply radial static pre-deformation to the elastic element 5 and to perform dynamic decoupling between the elastic element 5 and the limiting mechanism 1.

[0042] Therefore, this device dynamically decouples the mechanical impedance test system of the elastic element 5 by setting up multiple first airbags 13 and multiple second airbags 23, reduces the lateral vibration caused by the use of static pre-deformation, and ensures the reliability and accuracy of the data through the transmission of the input force measurement mechanism 2 and the output force measurement mechanism 6.

[0043] Furthermore, the input force measuring mechanism 2 includes a second force balancing plate 24 and a plurality of force sensors 25; the second force balancing plate 24 is installed on the top of the elastic element 5, and the second force balancing plate 24 is located between the elastic element 5 and the force sensor 25, and is used to distribute the effect of the gravity load, while providing the force sensor 25 with a higher contact stiffness, which can also make the flange at the output end of the elastic element 5 vibrate evenly; a plurality of force sensors 25 are installed at intervals on the top surface of the second force balancing plate 24.

[0044] The output force measurement mechanism 6 comprises a rigid base 26, a force measurement platform 27, and an adapter plate 28, connected in sequence from bottom to top. The elastic element 5 is mounted on the adapter plate 28. This device simultaneously calculates the origin and span mechanical impedances of the elastic element 5 using the force at the input end of the elastic element 5 measured by the dynamic force sensor 25, the force at the output end of the elastic element 5 measured by the force measurement platform 27, and the displacement at the input end of the elastic element 5 measured by the acceleration sensor 11. The force measurement platform 27 utilizes an existing structure, and its specific structure and operating principle are not detailed here. In other embodiments, the force measurement platform 27 can be replaced with multiple force sensors 25 for measurement, depending on actual circumstances.

[0045] It should be noted that during measurement, one or more force sensors 25 can be selected based on the size and symmetry of the elastic element 5 and its maximum allowable load. The second force distribution plate 24 for outputting force should be as small and light as possible, but its stiffness should be sufficient to avoid system resonance within the measurement frequency range. The minimum lateral dimension of the second force distribution plate 24 for outputting force is determined by the size of the elastic element 5 to be measured.

[0046] Furthermore, each of the first and second airbags 13, 23 has air holes, allowing them to be inflated separately using an air compressor. The cover of the elastic element 5 has water injection holes and air vents. Water is injected into the elastic element 5 and pressurized to the desired pressure using a pressurizing device, such as an air compressor or pump, before the water injection holes and air vents are sealed.

[0047] Please refer to Figure 8 and Figure 9During the test, the multiple first airbags 13 and the multiple second airbags 23 are first pressurized by an air compressor to provide axial or radial pre-deformation loads, and then the entire test system is excited by a vibrator or a hammer; when testing the origin mechanical impedance, the dynamic force sensor 25 and the acceleration sensor 11 at the input end of the elastic element 5 are used to measure the force and displacement of the input end of the elastic element 5 respectively, and the measurement signals are sent to the vibration acquisition and analysis system for data acquisition and analysis, so as to calculate the origin mechanical impedance of the elastic element 5; when testing the span mechanical impedance, the force measurement platform 27 and the acceleration sensor 11 at the input end of the elastic element 5 are used to measure the force at the output end of the elastic element 5 and the displacement of its input end, and the measurement signals are sent to the vibration acquisition and analysis system for data acquisition and analysis, so as to calculate the span mechanical impedance of the elastic element 5.

[0048] It should be noted that the vibration collection and analysis system adopts the structure of the existing technology, and its specific structure and working principle are not described here in detail.

[0049] In summary, the present invention provides a mechanical impedance testing device for an elastic element 5 that can be subjected to three-way coupled pre-deformation. By setting a plurality of first airbags 13 in an axial pre-deformation decoupling mechanism 3 and a plurality of second airbags 23 in a radial pre-deformation decoupling mechanism 4, the mechanical impedance testing system of the elastic element 5 is dynamically decoupled, thereby reducing the lateral vibration caused by the use of static pre-deformation. The data is transmitted through the input force measuring mechanism 2 and the output force measuring mechanism 6 to ensure the reliability and accuracy of the data. At the same time, the present invention combines the common The coordinated setting solves the technical difficulties in testing the mechanical impedance of the elastic element 5 at different internal pressures under pre-deformation, and can effectively measure the mechanical impedance of the elastic element 5 at different internal pressures under pre-deformation to meet the reliability and accuracy of the mechanical impedance test of the elastic element 5 at different internal pressures under pre-deformation; in addition, the device can simultaneously calculate the origin mechanical impedance and cross-point mechanical impedance of the elastic element 5 through the force at the input end of the elastic element 5 measured by the dynamic force sensor 25, the force at the output end of the elastic element 5 measured by the force measurement platform 27, and the displacement at the input end of the elastic element 5 measured by the acceleration sensor 11.

[0050] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A mechanical impedance testing device for elastic elements capable of applying three-way coupled pre-deformation, characterized in that: The device comprises a limiting mechanism, an input force measuring mechanism, an axial pre-deformation decoupling mechanism, two sets of radial pre-deformation decoupling mechanisms, an elastic element, and an output force measuring mechanism; the limiting mechanism is arranged around the circumference of the elastic element and is used to limit the elastic element; the input force measuring mechanism is installed on the top of the elastic element and is used to measure the input end force of the elastic element; The axial pre-deformation decoupling mechanism is installed on the top of the input force measuring mechanism, and is used to apply axial static pre-deformation to the elastic element and perform dynamic decoupling between the elastic element and the limiting mechanism; two groups of radial pre-deformation decoupling mechanisms are installed on the limiting mechanism and are respectively arranged on both sides of the bottom of the axial pre-deformation decoupling mechanism, and are used to apply radial static pre-deformation to the elastic element and perform dynamic decoupling between the elastic element and the limiting mechanism; the elastic element is installed on the output force measuring mechanism, and the output force measuring mechanism is used to measure the output end force of the elastic element.

2. The elastic element mechanical impedance testing device capable of applying three-way coupled pre-deformation according to claim 1, characterized in that: The limiting mechanism includes two groups of T-shaped connecting frames; the two groups of T-shaped connecting frames are symmetrically arranged horizontally, and each end of the T-shaped connecting frame is connected to a vertically arranged limiting frame; each of the limiting frames is installed on a limiting base plate; multiple limiting base plates are arranged around the output force measuring mechanism; multiple limiting frames are arranged around the elastic element.

3. The elastic element mechanical impedance testing device capable of applying three-way coupled pre-deformation according to claim 1, characterized in that: The axial pre-deformation decoupling mechanism includes a first force-distributing plate, an acceleration sensor, a plurality of first support seats, a plurality of first airbags, a plurality of first bolts, a square positioning plate and an adapter frame; the first force-distributing plate is installed on the top of the input force measuring mechanism, and an excitation hole connected to the exciter is opened at the center and on each side wall, and the exciter is used to provide axial or radial excitation to the elastic element; the acceleration sensor is installed on the first force-distributing plate and close to the excitation hole, and the direction of the acceleration sensor is consistent with the excitation direction generated by the exciter, and is used to measure the acceleration response of the input end of the elastic element; the square positioning plate They are arranged in parallel and at intervals directly above the first force uniformly distributing plate; multiple first support seats are installed at intervals on the top surface of the first force uniformly distributing plate; the first airbag is installed horizontally between the corresponding first support seat and the square positioning plate, for applying axial static pre-deformation to the elastic element and performing dynamic decoupling between the elastic element and the limiting mechanism; multiple first bolts pass through the square positioning plate respectively, and the bottom end protruding length can be adjusted to be close to the top surface of the first force uniformly distributing plate, for axially limiting the elastic element; the adapter frame is installed on the top surface of the square positioning plate and is connected to the limiting mechanism.

4. The elastic element mechanical impedance testing device capable of applying three-way coupled pre-deformation according to claim 3, characterized in that: The adapter frame includes a square frame and two positioning seats; the square frame is installed on the top surface of the square positioning plate; the two positioning seats are respectively installed on the tops of the opposite sides of the square frame and are respectively connected to the limiting mechanisms.

5. The elastic element mechanical impedance testing device capable of applying three-way coupled pre-deformation according to claim 4, characterized in that: The positioning seat includes multiple reinforcement plates, a bottom plate, a top plate and multiple connecting plates; the multiple reinforcement plates are installed on the top surface of the square positioning plate at intervals, and are all connected to the side walls of the square frame; the bottom plate is installed on the top of the reinforcement plate and one side of the square frame; the top plate is arranged parallel and spaced directly above the bottom plate, and is connected to the limiting mechanism; multiple connecting plates are connected between the bottom plate and the top plate.

6. The elastic element mechanical impedance testing device capable of applying three-way coupled pre-deformation according to claim 1, characterized in that: The radial pre-deformation decoupling mechanism includes a plurality of limit seats, a base, a plurality of second support seats, a plurality of second bolts and a plurality of second airbags; the limit seats and the base are respectively installed at intervals on the inner side of the limit mechanism; the second support seat is installed on the bottom end of the axial pre-deformation decoupling mechanism, and is respectively arranged in parallel with the limit seat and the base; a vertical second airbag is installed between the second support seat and the limit seat, and between the second support seat and the base, and the second airbag is used to apply radial static pre-deformation to the elastic element and perform dynamic decoupling between the elastic element and the limit mechanism; A plurality of second bolts pass through the base and the limiting seat respectively, and the protruding length of the ends is adjustable to be close to a side surface of the second support seat away from the elastic element, and are used to radially limit the elastic element.

7. The elastic element mechanical impedance testing device capable of applying three-way coupled pre-deformation according to claim 6, characterized in that: The base includes an adjusting plate, a connecting frame and a base plate, the adjusting plate is provided with a plurality of vertically extending strip holes, the adjusting plate is height-adjustably mounted on the limiting mechanism through the strip holes and bolts, the connecting frame is connected between the adjusting plate and the base plate, and a plurality of second bolts are inserted at intervals on the base plate; the limiting seat includes a fixing plate, a bracket and a receiving plate, the fixing plate is provided with a plurality of vertically extending strip holes, the fixing plate is height-adjustably mounted on the limiting mechanism through the strip holes and bolts, the bracket is connected between the fixing plate and the receiving plate, and a plurality of second bolts are inserted at intervals on the receiving plate.

8. The elastic element mechanical impedance testing device capable of applying three-way coupled pre-deformation according to claim 1, characterized in that: The input force measurement mechanism includes a second force balancing plate and a plurality of force sensors; the second force balancing plate is mounted on the top of the elastic element; the plurality of force sensors are installed at intervals on the top surface of the second force balancing plate; The axial pre-deformation decoupling mechanism is mounted on top of the plurality of force sensors.

9. The elastic element mechanical impedance testing device capable of applying three-way coupled pre-deformation according to claim 1, characterized in that: The output force measurement mechanism comprises a rigid base, a force measurement platform and an adapter plate which are sequentially connected from bottom to top; the elastic element is mounted on the adapter plate.

10. The elastic element mechanical impedance testing device capable of applying three-way coupled pre-deformation according to claim 1, characterized in that: It also includes an air compressor for inflating the axial pre-deformation decoupling mechanism and the radial pre-deformation decoupling mechanism respectively.

Images