A resonance fatigue force control test system

Abstract

The present invention relates to a resonant fatigue force control test system. The resonant fatigue force control test system includes a clamping device, including a vibration platform, a support frame and a clamp, the support frame is used to support the vibration platform, the clamp is located below the vibration platform, and the test sample is clamped between the clamp and the vibration platform; a vibration device, including a vibration motor, the vibration motor is arranged on the vibration platform and applies vibration force to the vibration platform; the vibration device includes an excitation spring and a two-degree-of-freedom stroke mechanism, the excitation spring is arranged on the vibration platform, the excitation spring is used to apply amplitude to the test sample through the vibration platform, the vibration platform is arranged on the support frame through the two-degree-of-freedom stroke mechanism, and the two-degree-of-freedom stroke mechanism is used to limit the vibration direction of the vibration platform. The present invention proposes a resonant fatigue force control test system, which efficiently completes fatigue testing in a force-controlled manner.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle detection, and in particular to a resonance fatigue force control test system. Background Art

[0002] Based on a certain resonance fatigue endurance test standard, tens of millions of fatigue tests need to be conducted on the sample at a frequency of more than 20Hz, an amplitude of more than 8mm, and force control. At present, hydraulic excitation and electromagnetic excitation are mostly used in the market for endurance tests. Hydraulic excitation is mostly used for endurance tests to directly excite the sample by connecting the actuator to the sample. If the requirements of high frequency and large amplitude are to be met, the equipment cost is extremely high and the hydraulic oil source needs to occupy a large area. At the same time, hydraulic equipment has the disadvantages of oil leakage, high noise, and high maintenance cost. Electromagnetic excitation is mostly used in resonance tables, mainly for measuring the natural frequency of samples. It consists of an electromagnet and an armature. By controlling and changing the direction of the current in the electromagnet, the purpose of changing the magnetic pole is achieved, forming the up and down vibration of the armature. It can achieve the effect of high-frequency vibration with high efficiency and low consumption, but the electromagnet generally has a magnetic field within a distance of 2mm. If the amplitude is too large, it will exceed the magnetic field range and is not suitable for high-amplitude fatigue tests. At the same time, the existing electromagnetic excitation vibration system generally only has displacement and acceleration control, and cannot perform force control. Summary of the invention

[0003] In view of the above problems in the prior art, the present invention proposes a resonance fatigue force control test system, which efficiently completes the fatigue test in a force control manner.

[0004] Specifically, the present invention proposes a resonance fatigue force control test system, comprising:

[0005] The clamping device comprises a vibration platform, a support frame and a clamp, wherein the support frame is used to support the vibration platform, the clamp is located below the vibration platform, and the test sample is clamped between the clamp and the vibration platform;

[0006] A vibration device, comprising a vibration motor, wherein the vibration motor is arranged on the vibration platform and applies a vibration force to the vibration platform;

[0007] The excitation device includes an excitation spring and a two-degree-of-freedom stroke mechanism, wherein the excitation spring is arranged on the excitation platform, and the excitation spring is used to apply amplitude to the test sample through the excitation platform, and the excitation platform is arranged on the supporting frame through the two-degree-of-freedom stroke mechanism, and the two-degree-of-freedom stroke mechanism is used to limit the vibration direction of the excitation platform.

[0008] According to one embodiment of the present invention, the vibration device also includes a preload mechanism, which includes a locking bolt and a preload block. The locking bolt is arranged on the vibration platform, the vibration spring is sleeved on the locking bolt, the preload block is threadably matched with the bolt, the vibration spring is arranged between the preload block and the vibration platform, and the locking bolt is used to control the lifting and lowering of the preload block to adjust the expansion and contraction amount of the vibration spring.

[0009] According to one embodiment of the present invention, the two-degree-of-freedom travel mechanism includes a column and a support block arranged on the column, the bottom of the column is fixedly arranged on the support frame, and the excitation platform is mounted on the column and supported by the support block.

[0010] According to an embodiment of the present invention, the two-degree-of-freedom travel mechanism further includes a limit stopper, and the limit stopper is fixedly cooperated with the column so that the excitation platform is arranged between the limit stopper and the support block.

[0011] According to an embodiment of the present invention, the vibration device includes two vibration motors, which are arranged in parallel and spaced apart in a horizontal direction.

[0012] According to an embodiment of the present invention, the vibration device further includes a counterweight block, and the vibration motor is arranged on the vibration excitation platform through the counterweight block.

[0013] According to one embodiment of the present invention, a sensing device is further included, wherein the sensing device includes a force sensor and a displacement sensor, wherein the force sensor is disposed between the vibration platform and the test sample, and the displacement sensor is disposed on the support frame for monitoring the displacement of the test sample.

[0014] According to one embodiment of the present invention, it also includes a control device, which is connected to the excitation device and the sensor device, and is used to adjust the expansion and contraction amount of the excitation spring and obtain the detection signals of the force sensor and the displacement sensor.

[0015] According to an embodiment of the present invention, the control device is connected to the vibration device and is used to control the vibration frequency of the vibration motor.

[0016] According to one embodiment of the present invention, the control device includes a host computer and a data acquisition board. The host computer adjusts the expansion and contraction amount of the exciting spring and the vibration frequency of the vibration motor according to test requirements, and the host computer obtains the detection signal through the data acquisition board.

[0017] The present invention provides a resonance fatigue force control test system, which has a compact overall structure and can provide a high-amplitude, high-frequency, high-efficiency, and low-energy-consumption force control test for fatigue test samples.

[0018] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present invention, and are incorporated into and constitute a part of this application. The accompanying drawings illustrate embodiments of the present invention and together with the specification serve to explain the principles of the present invention. In the accompanying drawings:

[0020] Figure 1 A structural schematic diagram of a resonance fatigue force control test system according to an embodiment of the present invention is shown.

[0021] Figure 2 A flowchart of the operation flow of a resonance fatigue force control test system according to an embodiment of the present invention is shown.

[0022] The above drawings include the following reference numerals:

[0023] Test system 100 Clamping device 101

[0024] Vibration device 102 Excitation device 103

[0025] Vibration platform 104 Support frame 105

[0026] Fixture 106 Vibration motor 107

[0027] Excitation spring 108 Locking bolt 109

[0028] Preload stopper 110 Post 111

[0029] Support block 112 Limit stopper 113

[0030] Counterweight 114 Force sensor 115

[0031] Displacement sensor 116 Test sample 117 DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0036] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0037] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0038] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0039] Figure 1 The structure diagram of a resonance fatigue force control test system according to an embodiment of the present invention is shown. As shown in the figure, a resonance fatigue force control test system 100 mainly includes a clamping device 101 , a vibration device 102 and an excitation device 103 .

[0040] Among them, the clamping device 101 includes an excitation platform 104, a support frame 105 and a clamp 106. The support frame 105 is used to support the excitation platform 104. In this embodiment, two support frames 105 are arranged at intervals. The clamp 106 is used to clamp the test sample 117, and the clamp 106 is located below the excitation platform 104. The test sample 117 is fixed between the clamp 106 and the excitation platform 104. Specifically, the bottom of the clamp 106 can be directly set on the ground, and the test sample 117 is fixed between the excitation platform 104 and the ground through the clamp 106, and the vibration device 102 and the excitation device 103 apply a vibration force of set amplitude and frequency to the test sample 117.

[0041] The vibration device 102 includes a vibration motor 107. The vibration motor 107 is disposed on the vibration platform 104 and applies a vibration force to the vibration platform 104.

[0042] The excitation device 103 includes an excitation spring 108 and a two-degree-of-freedom stroke mechanism. The excitation spring 108 is arranged on the excitation platform 104, and the excitation spring 108 is used to apply the amplitude in the vibration direction to the test sample 117 through the excitation platform 104. The excitation platform 104 is arranged on the support frame 105 through the two-degree-of-freedom stroke mechanism, and the two-degree-of-freedom stroke mechanism is used to limit the vibration direction of the excitation platform 104. In this embodiment, the two-degree-of-freedom stroke mechanism limits the vibration of the excitation platform 104 in the vertical direction.

[0043] Preferably, the vibration device 103 further includes a preload mechanism. The preload mechanism includes a locking bolt 109 and a preload block 110. The locking bolt 109 is disposed on the vibration platform 104, and the vibration spring 108 is sleeved on the locking bolt 109. The preload block 110 cooperates with the bolt thread so that the vibration spring 108 is disposed between the preload block 110 and the vibration platform 104. The locking bolt 109 is used to control the lifting and lowering of the preload block 110 to adjust the expansion and contraction amount of the vibration spring 108. In other words, the height of the preload block 110 determines the elastic travel of the vibration spring 108.

[0044] Preferably, the two-degree-of-freedom stroke mechanism includes a column 111 and a support block 112 disposed on the column 111. In the present embodiment, the bottoms of the four columns 111 are fixedly disposed on two support stands 105, respectively. The columns 111 are disposed vertically, and the excitation platform 104 is sleeved on the four columns 111 and supported by the support block 112 so that the excitation platform 104 is stably maintained in the horizontal direction and the test sample 117 is only subjected to forces in the up and down directions. More preferably, the two-degree-of-freedom stroke mechanism also includes a limit block 113, and the limit block 113 is fixedly cooperated with the column 111 so that the excitation platform 104 is disposed between the limit block 113 and the support block 112. The limit block 113 provides mechanical displacement protection for the test sample 117 and the test system 100.

[0045] Preferably, the vibration device 102 includes two vibration motors 107. The two vibration motors 107 are arranged in parallel and spaced apart in the horizontal direction. Such an arrangement can offset the vibration in the horizontal direction of left and right and front and back directions, so that the test sample 117 is only subjected to the vibration in the up and down directions.

[0046] Preferably, the vibration device 102 further includes a counterweight 114 , and the vibration motor 107 is disposed on the vibration platform 104 via the counterweight 114 .

[0047] Preferably, the resonance fatigue force control test system 100 further includes a sensing device. The sensing device includes a force sensor 115 and a displacement sensor 116. The force sensor 115 is arranged between the excitation platform 104 and the test sample 117, and is used to collect the value of the vibration force to which the test sample 117 is subjected during the test. The displacement sensor 116 is arranged on the support frame 105, and is used to monitor the displacement value of the test sample 117.

[0048] Preferably, the resonance fatigue force control test system 100 further includes a control device (not shown). The control device is connected to the excitation device 103 and the sensor device. The control device is used to adjust the expansion and contraction amount of the excitation spring 108 and obtain the detection signals of the force sensor 115 and the displacement sensor 116.

[0049] Preferably, the control device is connected to the vibration device 102 to control the vibration frequency of the vibration motor 107. More preferably, the control device includes a host computer and a data acquisition board. The host computer adjusts the expansion and contraction amount of the exciting spring 108 and the vibration frequency of the vibration motor 107 according to the test requirements, and the host computer obtains the detection signal through the data acquisition board. It is easy to understand that the host computer can be connected to the preload mechanism of the exciting device 103 to send a control signal to the locking bolt 109. The locking bolt 109 controls the lifting and lowering of the preload block 110 thereon to adjust the expansion and contraction amount of the exciting spring 108. The host computer obtains the detection signals of the force sensor 115 and the displacement sensor 116 through the data acquisition board. The host computer can control the action of the preload mechanism or terminate the test through the detection signal.

[0050] Figure 2 The following is a flowchart showing the operation flow of a resonance fatigue force control test system according to an embodiment of the present invention. Figure 1 The installation and operation steps of the resonance fatigue force control test system 100 are described.

[0051] Step S1 , according to the design information of the test sample 117 , the test sample 117 is clamped in the test system 100 through the fixture 106 and the support stand 105 .

[0052] Step S2 , adjusting the lifting and lowering of the preload stopper 110 of the preload mechanism, and controlling the travel extension amount of the exciting spring 108 to apply preload to the test sample 117 .

[0053] Step S3, the two vibration motors 107 gradually increase their rotation speed from low to high, and their vibration frequency gradually increases. Since the vibration motors 107 are arranged relatively spaced apart, they can offset the vibration in the horizontal direction, and under the limitation of the two-degree-of-freedom stroke mechanism, the vertical force required for the test is applied to the vibration platform 104 through the counterweight block 114 and the vibration spring 108. The test force value is measured by the force sensor 115 between the fixture 106 of the test sample 117 and the vibration platform 104.

[0054] Step S4: When the vibration frequency gradually approaches the resonance frequency of the test sample 117, the test force and amplitude gradually increase. After reaching the test set force value, the vibration motor 107 maintains the current speed to perform the fatigue endurance test.

[0055] Step S5: During the experiment, the displacement sensor 116 monitors the amplitude of the test system 100 in real time. When the test sample 117 has cracks, breaks, etc., and the amplitude increases to the set threshold, the test stops. At the same time, the limit block 113 performs mechanical displacement protection on the test sample 117 and the test system 100. In addition, when the number of tests reaches the required number of fatigue endurance cycles, the test ends.

[0056] Step S6: During the test, the force sensor 115 monitors the force value of the test system 100 in real time. As the fatigue endurance test proceeds, the stiffness of the test sample 117 gradually decreases. When the difference between the measured force value and the set force value is greater than the set threshold, step 3 is repeated until the set force value is reached.

[0057] The present invention adopts a mechanical excitation method to load the vibration generated by the rotation of the two unbalanced shafts into the entire system through the excitation spring 108. Based on the principle that the resonance point has the minimum energy consumption and the maximum amplitude, the frequency corresponding to the point where the exciter power is the minimum is obtained within the set sweep frequency range, that is, the resonance frequency of the entire system, and a high-amplitude, high-frequency, low-energy-consumption force-controlled fatigue test is performed at this frequency.

[0058] The resonance fatigue force control test system for a wheel provided by the present invention has the following advantages:

[0059] 1. Compact structure.

[0060] 2. Easy to install and simple to operate.

[0061] 3. It can realize fatigue test with high amplitude, high frequency, high efficiency and force control.

[0062] It will be apparent to those skilled in the art that various modifications and variations may be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A resonance fatigue force control test system, comprising: The clamping device comprises a vibration platform, a support frame and a clamp, wherein the support frame is used to support the vibration platform, the clamp is located below the vibration platform, and the test sample is clamped between the clamp and the vibration platform; A vibration device, comprising a vibration motor, wherein the vibration motor is arranged on the vibration platform and applies a vibration force to the vibration platform; The excitation device includes an excitation spring and a two-degree-of-freedom stroke mechanism, wherein the excitation spring is arranged on the excitation platform, and the excitation spring is used to apply amplitude to the test sample through the excitation platform, and the excitation platform is arranged on the supporting frame through the two-degree-of-freedom stroke mechanism, and the two-degree-of-freedom stroke mechanism is used to limit the vibration direction of the excitation platform.

2. The resonance fatigue force control test system according to claim 1, characterized in that: The vibration device also includes a preload mechanism, which includes a locking bolt and a preload block. The locking bolt is arranged on the vibration platform, the vibration spring is sleeved on the locking bolt, the preload block is threadably matched with the bolt, the vibration spring is arranged between the preload block and the vibration platform, and the locking bolt is used to control the lifting and lowering of the preload block to adjust the expansion and contraction amount of the vibration spring.

3. The resonance fatigue force control test system according to claim 1, characterized in that: The two-degree-of-freedom travel mechanism comprises a column and a support block arranged on the column, the bottom of the column is fixedly arranged on the support frame, and the excitation platform is sleeved on the column and supported by the support block.

4. The resonance fatigue force control test system according to claim 3, characterized in that: The two-degree-of-freedom travel mechanism further comprises a limit stopper, and the limit stopper is fixedly matched with the column so that the excitation platform is arranged between the limit stopper and the support block.

5. The resonance fatigue force control test system according to claim 1, characterized in that: The vibration device comprises two vibration motors which are arranged in parallel and spaced apart in a horizontal direction.

6. The resonance fatigue force control test system according to claim 5, characterized in that: The vibration device further comprises a counterweight block, and the vibration motor is arranged on the vibration exciting platform via the counterweight block.

7. The resonance fatigue force control test system according to claim 1, characterized in that: It also includes a sensing device, which includes a force sensor and a displacement sensor. The force sensor is arranged between the vibration platform and the test sample, and the displacement sensor is arranged on the supporting frame to monitor the displacement of the test sample.

8. The resonance fatigue force control test system according to claim 7, characterized in that: It also includes a control device, which is connected to the excitation device and the sensor device, and is used to adjust the expansion and contraction amount of the excitation spring and obtain detection signals from the force sensor and the displacement sensor.

9. The resonance fatigue force control test system according to claim 8, characterized in that: The control device is connected to the vibration device and is used to control the vibration frequency of the vibration motor.

10. The resonance fatigue force control test system according to claim 9, characterized in that: The control device includes a host computer and a data acquisition board. The host computer adjusts the expansion and contraction amount of the exciting spring and the vibration frequency of the vibration motor according to test requirements. The host computer obtains the detection signal through the data acquisition board.

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