A vibration test device, a vibration test method, and a test analysis method

Abstract

The present invention discloses a vibration test device, which includes a vibration device providing a Z-axis vibration direction, a specimen mounting table, a locking device, and at least two vibration force conversion devices connected to the vibration device. The vibration force conversion device outputs the received force vertically. A translation device adjusts the vibration force conversion device to move away from or close to the specimen mounting table. When the locking device is in the locked state, the vibration device provides vibration in the Z-axis direction for the specimen mounting table. When the locking device is unlocked, the vibration force conversion device is connected to the specimen mounting table, and the vibration in the Z-axis direction is converted to provide vibration in the X-axis or Y-axis direction for the specimen mounting table. By converting the vibration in the Z-axis direction into the X-axis and Y-axis directions through the vibration force conversion device, a single electric vibration table can perform a three-axis vibration test, saving costs, reducing the number of times of specimen clamping, having no vibration phase difference with the same vibration table, improving the accuracy of the vibration test, and improving the efficiency of the vibration test.

Description

Technical Field

[0001] The present invention relates to the inspection and testing of electronic products, and specifically to a vibration test device, a vibration test method, and a test analysis method. Background Art

[0002] With the development of science and technology, the requirements for the mechanical environment adaptation of electronic devices are getting higher. Usually, vibration tests are carried out to test the anti-vibration performance of electronic devices. With the increasing demand for vibration tests of electronic products, it is inevitable to improve the vibration test efficiency.

[0003] Currently, the vibration test in different directions is mainly carried out through the vertical table and the horizontal table of the electromagnetic vibration table. The electronic product under test (including the vibration damping device) is tested in three axes (vertical Z-axis, horizontal X-axis, and horizontal Y-axis). That is, after the vertical test is completed, the vibration driver (moving coil) needs to be detached from the vertical table and connected to the horizontal table from the vertical direction to the horizontal direction for the horizontal (X, Y) direction test. Each time the table is inverted and several screws are loosened / tightened, it takes a lot of time, and the test piece needs to be clamped at least three times, seriously affecting the vibration test efficiency. Currently, the existing technologies use multiple vibration tables to achieve three-axis vibration. For example, the patent application with the publication number CN110243563A discloses a three-axis six-degree-of-freedom vibration test device, which realizes three-axis six-degree-of-freedom vibration through eight electric vibration tables. The investment cost is high. Other devices that realize three-axis vibration also require at least 6 electromagnetic vibration tables. There are problems with the vibration phase differences of each vibration table, that is, the displacements are not synchronized, which is not suitable for popularization and application.

[0004] When conducting vibration tests on electronic products, an electronic product (including the vibration damping device) usually monitors the vibration response values at multiple points of the electronic product. Usually, a vibration test in one direction will generate vibration curves and test data with multiple points and multiple cycles. Later, manual analysis is carried out, resulting in low efficiency in the entire vibration test process and the subsequent data analysis process. If problems are found in the data during the middle stage of the test, the entire test process will be an invalid test, wasting manpower, material resources, and time. Summary of the Invention

[0005] Object of the Invention: Aiming at the above-mentioned disadvantages, the present invention provides a vibration test device that realizes three-axis vibration with a single motor.

[0006] The present invention also provides a vibration test method and a test analysis method.

[0007] Technical solution: To solve the above problems, the present invention adopts a vibration test device, which includes a vibration device providing the vibration direction of the Z axis, a specimen mounting table for mounting a vibration test specimen arranged directly above the vibration device, a locking device arranged between the vibration device and the specimen mounting table, and at least two vibration force conversion devices. The vibration force conversion device includes a force input end and a force output end. The vibration force conversion device is used to vertically output the force received at the force input end from the force output end. The force input end of the vibration force conversion device is connected to the vibration device through a translation device, and the vibration force conversion device is located on the side of the specimen mounting table. The translation device is used to adjust the installation position of the vibration force conversion device on the vibration device, so that the force output end of the vibration force conversion device is far from or close to the specimen mounting table. When the specimen mounting table is fixedly connected to the vibration device through the locking device, the locking device is in a locked state, and the vibration device provides vibration in the Z-axis direction for the specimen mounting table. When the specimen mounting table is fixedly connected to the vibration device through the vibration force conversion device, the locking device is unlocked, the vibration force conversion device approaches the specimen mounting table and is connected to the specimen mounting table, and the vibration force conversion device converts the Z-axis vibration provided by the vibration device into X-axis or Y-axis vibration provided for the specimen mounting table.

[0008] Further, the vibration force conversion device includes a first conversion unit and a second conversion unit located on both sides of the specimen mounting table. The first conversion unit and the second conversion unit are connected to or not connected to the specimen mounting table at the same time. When the first conversion unit and the second conversion unit are connected to the specimen mounting table, they provide vibration in the same direction and on the same straight line for the specimen mounting table.

[0009] Further, the first conversion unit includes a bottom bracket, an angular bracket, and a first vibration transmission rod; the second conversion unit includes a bottom bracket, an angular bracket, and a second vibration transmission rod. The angular bracket includes a first angular side and a second angular side fixedly connected. An included angle is formed between the first angular side and the second angular side. The first angular side is fixedly connected to the bottom bracket, and the second angular side is connected to the first vibration transmission rod or the second vibration transmission rod. The first vibration transmission rod includes a first connection part and a first transmission part fixedly connected. A first included angle is formed between the first connection part and the first transmission part. The first connection part is connected to the second angular side of the angular bracket, and the first transmission part is connected to the specimen mounting table, and the first transmission part is parallel to the X axis or the Y axis. The second vibration transmission rod includes a second connection part and a second transmission part fixedly connected. A second included angle is formed between the second connection part and the second transmission part. The second connection part is connected to the second angular side of the angular bracket, and the second transmission part is connected to the specimen mounting table, and the second transmission part is on the same straight line as the first transmission part. The first included angle and the second included angle have the same degree and opposite orientations. The first angular side of the angular bracket is parallel to the X axis or the Y axis, and the included angle formed between the first angular side and the second angular side is a complementary angle to the first included angle or the second included angle.

[0010] Furthermore, the specimen mounting table is square, and mounting plates are fixedly connected to the four sides of the specimen mounting table. A number of mounting holes are provided in the mounting plates, and locking screws are arranged in the mounting holes. Threaded holes are provided at the ends of the first transmission part and the second transmission part. By screwing the locking screws into the threaded holes of the first transmission part and the second transmission part, the connection between the vibration force conversion device and the specimen mounting table is realized.

[0011] Furthermore, the translation device includes a U-shaped through hole provided in the bottom bracket and a locking screw provided on the vibration device. The locking screw is arranged in the U-shaped through hole. By moving the bottom bracket and then tightening the locking screw, the adjustment of the installation position of the vibration force conversion device on the vibration device is realized.

[0012] Furthermore, the vibration device includes a vibration moving coil, a vibration table fixedly arranged at the output end of the vibration moving coil, and an additional table surface arranged at the upper end of the vibration table. The cross-section of the additional table surface is smaller than that of the vibration table. The translation device is arranged on the vibration table. The bottom bracket is tightened and positioned on the vibration table through the locking screw arranged on the vibration table and is located on the side of the additional table surface. A number of through holes are provided in the additional table surface.

[0013] Furthermore, the locking device includes a transfer table surface, a locking piece support fixedly arranged on the transfer table surface, a locking piece hinged to the locking piece support, and locking screws arranged on the additional table surface and the specimen mounting table. When the locking device is in the locked state, the transfer table surface is located between the specimen mounting table and the additional table surface, and the locking piece is tightened through the locking screws on the additional table surface and the specimen mounting table; when the locking device is in the unlocked state, the locking piece is separated from the locking screw, and the transfer table surface is moved out between the specimen mounting table and the additional table surface.

[0014] The present invention also adopts a vibration test method for a vibration test device. When performing a vibration test with the vibration direction along the Z axis, loosen the locking screws connecting the mounting plate and all vibration force conversion devices, then loosen the locking screws in the U-shaped through hole, and tighten them after the bottom bracket moves away from the specimen mounting table. Place the transfer table surface between the specimen mounting table and the additional table surface, and tighten the locking piece through the locking screws on the additional table surface and the specimen mounting table;

[0015] When performing a vibration test with the vibration direction along the X / Y axis, loosen the locking screws in the U-shaped through hole, move the bottom bracket close to the specimen mounting table, and tighten the locking screws connecting the mounting plate and the vibration force conversion device providing vibration in the X / Y axis direction. Then tighten the locking screws in the U-shaped through hole, loosen the locking screws connecting the locking piece, and move the transfer table surface out of between the specimen mounting table and the additional table surface.

[0016] The present invention also adopts a test analysis method for a vibration test device, including the following steps:

[0017] (1) Fix the test piece on the test piece mounting table;

[0018] (2) Set the vibration test device according to the preset X / Y / Z axis direction vibration test;

[0019] (3) Set the test input conditions and set the limit values of the response test parameters;

[0020] (4) Conduct the test according to the test input conditions, and periodically collect the vibration test data of the test piece. The collected vibration test data includes vibration amplitude, vibration acceleration, and vibration frequency;

[0021] (5) Analyze the vibration amplitude or vibration acceleration based on the vibration frequency of the vibration test data to form a vibration response curve;

[0022] (6) Real-time judge whether the vibration amplitude or vibration acceleration value exceeds the set limit value of the response test parameters; if it exceeds, stop the vibration test..

[0023] Advantageous effects: Compared with the prior art, the significant advantage of the present invention is that the vibration in the Z-axis direction is converted into the X-axis and Y-axis directions through the vibration force conversion device, realizing a three-axis six-degree-of-freedom vibration test with a single electric vibration table, saving costs, reducing the number of times the test piece is clamped. Using the same vibration table, there is no vibration phase difference, improving the accuracy of the vibration test. At the same time, reducing the number of times the test piece is clamped reduces the clamping time and improves the vibration test efficiency. And use the vibration curve analysis technology to batch analyze the product vibration curve data, thereby improving the efficiency of the vibration test process and the vibration curve analysis efficiency. The QMS system gives timely feedback and warns the test inspectors. If it does not meet the requirements, the test can be stopped immediately, no invalid test is done, and the invalid vibration test process is reduced. Description of the Drawings

[0024] Figure 1 The following shows the overall structural schematic diagram of the vibration test device of the present invention;

[0025] Figure 2 The following shows the front view of the vibration test device of the present invention;

[0026] Figure 3 The following shows the top view of the vibration test device of the present invention;

[0027] Figure 4 The following shows the partial structural schematic diagram of the locking device in the present invention;

[0028] Figure 5 The following shows the structural schematic diagram of the first conversion unit in the present invention;

[0029] Figure 6 The following shows the structural schematic diagram of the second conversion unit in the present invention;

[0030] Figure 7 The following is a schematic structural view of the connection between the specimen mounting table and the vibration transmission rod in the present invention;

[0031] Figure 8 The following is the force transmission principle diagram of the vibration force conversion device in the present invention;

[0032] Figure 9 The following is a schematic structural view of the working part of the vibration test device when the present invention conducts a vibration test in the Z-axis direction;

[0033] Figure 10 The following is a schematic structural view of the working part of the vibration test device when the present invention conducts a vibration test in the X-axis direction;

[0034] Figure 11 The following is a schematic structural view of the working part of the vibration test device when the present invention conducts a vibration test in the Y-axis direction;

[0035] Figure 12 The following is a schematic overall structural view of the vibration test device when the present invention conducts a vibration test in the Y-axis direction;

[0036] Figure 13 The following is a schematic view of the vibration test process of the present invention;

[0037] Figure 14 The following is the vibration curve data stream of the present invention;

[0038] Figure 15 The following are the vibration response curves of each point of the specimen for multiple cycles;

[0039] Figure 16 The following is the vibration response curve after analyzing and removing unqualified products. Specific implementation manners

[0040] Example 1

[0041] As Figures 1 to 3As shown in the figure, a vibration test device in this embodiment includes a vibration device 1 that provides the vibration direction of the Z axis, a specimen mounting table 2 for mounting a vibration test specimen disposed directly above the vibration device, a locking device 3 disposed between the vibration device and the specimen mounting table, and at least two vibration force conversion devices 4. The vibration force conversion device includes a force input end and a force output end. The vibration force conversion device is used to vertically output the force received at the force input end from the force output end. The force input end of the vibration force conversion device is connected to the vibration device through a translation device, and the vibration force conversion device is located on the side of the specimen mounting table. The translation device is used to adjust the installation position of the vibration force conversion device on the vibration device, so that the force output end of the vibration force conversion device is far from or close to the specimen mounting table. The vibration force conversion device converts the Z-axis vibration provided by the vibration device into X-axis or Y-axis vibration for the specimen mounting table. In this embodiment, four vibration force conversion devices are used, two of which provide vibration in the X-axis direction and two of which provide vibration in the Y-axis direction.

[0042] The vibration device 4 includes a vibration moving coil 41 disposed on a vibration table body 44, a vibration table 42 fixedly disposed at the output end of the vibration moving coil, and an additional table top 43 disposed at the upper end of the vibration table. The additional table top is formed by aluminum casting. The additional table top body is provided with a plurality of through holes to reduce the weight of the table top on the basis of ensuring the rigidity of the table body. The bottom end of the additional table top is provided with an outer edge step plane, and mounting screw through holes are provided around the step plane and are connected to the vertical table surface of the vibration table 42. The top end of the additional table top 43 is provided with locking screws 34 of the locking device for connecting to the transfer table top 31. The cross section of the additional table top 43 is smaller than that of the vibration table 42. The locking screws of the translation device are disposed on the edge of the vibration table 42, around the side of the additional table top 43, and the bottom bracket is tightened and positioned on the vibration table 42 through the locking screws disposed on the vibration table 42.

[0043] As Figure 4 As shown in the figure, the locking device 3 includes a transfer table top 31, a locking piece support 32 fixedly disposed on the transfer table top, a locking piece 33 hinged to the locking piece support, and locking screws 34 disposed on the additional table top and the specimen mounting table. The transfer table top 31 is formed by aluminum casting, and the length and width dimensions are the same as the length and width dimensions of the upper end of the additional table top. The bottom end and the top end of the transfer table top 31 are provided with locking piece supports 32 on the side surfaces. One end of the locking piece 33 is rotatably connected to the locking piece support 31, and the other end is connected to the additional table top 43 and the specimen mounting table 2 and is locked with the locking screws 34 to integrate the additional table top 43, the transfer table top 31, and the specimen mounting table 2 to meet the vertical test requirements.

[0044] The specimen mounting table 2 is formed by casting aluminum. The upper surface of the specimen mounting table 2 is a specimen mounting plane, and there are several regularly arranged threaded holes on the plane for mounting the specimen. The periphery of the specimen mounting table is fixedly connected with mounting plates 21. The plane where the mounting plates 21 are located is perpendicular to the specimen mounting plane, forming a "mouth" shape. The mounting plates 21 are provided with several mounting holes connected to the transmission parts of the vibration transmission rods. Locking screws 22 are arranged in the mounting holes for connecting with the vibration force conversion device 1. A rubber ring A 23 is arranged between the mounting hole and the locking screw. The cylindrical body of the rubber ring A is placed in the hole, and the circular step of the edge protrusion is placed on one side of the "mouth" shape edge. The other end of the rubber ring A is equipped with a cylindrical rubber sleeve 24. The rubber ring A and the rubber sleeve are used to provide a horizontal movement space for the specimen mounting table. Further, a connecting flat extended tabletop can be arranged on the specimen mounting table to expand the specimen mounting plane.

[0045] The vibration force conversion device 1 includes a first conversion unit 11 and a second conversion unit 12 located on both sides of the specimen mounting table 2, as Figure 5 shown. The first conversion unit 11 includes a bottom bracket 101, an angular bracket 102, and a first vibration transmission rod 111; as Figure 6 shown. The second conversion unit 12 includes a bottom bracket 101, an angular bracket 102, and a second vibration transmission rod 121. The bottom bracket 101 is an L-shaped bracket, and the L-shaped bracket is a 90-degree right angle. The upper end of the bottom bracket 101 is provided with a stepped platform with an outer edge for increasing the contact area connected with the angular bracket 102 and improving stability. The upper end of the bottom bracket is provided with an internal threaded hole, which is connected to the bottom end of the angular bracket; the short side of the lower end of the bottom bracket 101 is provided with a U-shaped through hole associated with the vertical tabletop of the vibration table. The U-shaped through hole is used to adjust the position of the L-shaped bracket. Connecting rods 103 are fixedly connected between two L-shaped brackets on the same side of the vibration table in pairs, forming a group, so that the L-shaped brackets on one side are stressed synchronously, realizing the synchronous movement of the L-shaped brackets and improving efficiency.

[0046] The angular bracket 102 includes a first angular side 1021 and a second angular side 1022 fixedly connected. An included angle is formed between the first angular side 1021 and the second angular side 1022. In this embodiment, the first angular side and the second angular side form a 45-degree angle. The first angular side of the angular bracket is parallel to the X-axis or the Y-axis, and a reinforcing rib 104 is provided between the first angular side and the second angular side. Through holes for mounting screws are provided on the first angular side. The end of the second angular side is provided with an external threaded rod, which is connected to the vibration transmission rod through a locking nut 1023. The first angular side is fixedly connected to the bottom bracket. The locking screw 1024 passes through the through hole on the first angular side and is screwed into the internal threaded hole at the upper end of the L-shaped bracket. The external threaded rod of the second angular side is connected to the first vibration transmission rod or the second vibration transmission rod.

[0047] The first vibration transmission rod 111 includes a first connection part 1111 and a first transmission part 1112 which are fixedly connected. A first included angle is formed between the first connection part and the first transmission part. The first connection part 1111 is provided with a through hole connected to the second angular side 1022 of the angular bracket. A rubber ring B 105 is arranged in the hole to reduce the coupling movement caused during the transmission of the vibration force, so as to protect the vibration force conversion device. The end of the first transmission part 1111 is provided with an internal threaded hole connected to the mounting plate on the "mouth" - shaped edge of the specimen mounting table, as Figure 7 shown. The locking screw on the mounting plate 21 is screwed into the internal threaded hole at the end of the first transmission part; and the first transmission part 1112 is parallel to the X - axis or the Y - axis. The second vibration transmission rod 121 includes a second connection part 1211 and a second transmission part 1212 which are fixedly connected. A second included angle is formed between the second connection part and the second transmission part. The second connection part is provided with a through hole connected to the second angular side of the angular bracket. A rubber ring B is arranged in the hole. The end of the second transmission part is provided with an internal threaded hole connected to the mounting plate 21 on the "mouth" - shaped edge of the specimen mounting table. The locking screw on the mounting plate 21 is screwed into the internal threaded hole at the end of the second transmission part, and the second transmission part 1212 is on the same straight line as the first transmission part. The first included angle and the second included angle have the same degree and opposite directions. In this embodiment, the first included angle and the second included angle form an angle of 135 degrees, the first included angle faces upward, and the second included angle faces downward.

[0048] The force - transmission model of the vibration force conversion device, as Figure 8 shown, F is the vertical (along the Z - axis) vibration driving force, F2 is the horizontal (along the X / Y - axis) driving force. According to the principle of force decomposition, it can be obtained that: From the calculation formula, it can be known that when takes a value of 45 degrees, F2 can obtain the maximum value. Therefore, in this embodiment, it is set that takes a value of 45 degrees. When takes a value of 45 degrees, the vibration - transmission force value reaches the maximum value F3 = F2 = 0.5F. Then the horizontal vibration force is the sum of F2 and F3, that is, the horizontal vibration resultant force is equal to the vertical vibration force.

[0049] Embodiment 2

[0050] The vibration test method in this embodiment is based on the vibration test device in Embodiment 1 and includes a vertical (along the Z - axis) test and a horizontal (along the X / Y - axis) test. Before the test, first install the additional tabletop, the adapter tabletop, the specimen mounting table, and the vibration force conversion device on the vibration table, and install the specimen to be tested on the specimen mounting table.

[0051] Vertical (along the Z - axis) test:

[0052] As Figure 9As shown, tighten the locking piece on the transfer tabletop with the locking screws on the additional tabletop and the specimen mounting table. Loosen the locking screws connecting the mounting plate to all the vibration force conversion devices, then loosen the locking screws in the U-shaped through holes, and tighten them after the bottom bracket moves away from the specimen mounting table, so that the vibration force conversion devices are separated from the specimen mounting table. Drive the vibration table to vibrate through the vibrating coil to achieve the vertical (along the Z-axis) vibration test and collect test data.

[0053] Horizontal test - along the X-axis:

[0054] As Figure 10 shown, ① Based on the vertical test, loosen the locking screws in the U-shaped through holes of the bottom brackets of the first transfer part and the second transfer part parallel to the X-axis, move the bottom brackets to make them close to the specimen mounting table, screw the locking screws of the mounting plate into the threaded holes of the transfer parts, and then tighten the locking screws in the U-shaped through holes. Loosen the locking screws fixing the locking pieces on the additional tabletop and the specimen mounting table to separate the locking pieces from the additional tabletop and the specimen mounting table, and then remove the transfer tabletop. Drive the vibration table to vibrate through the vibrating coil to achieve the vibration test along the X-axis and collect test data.

[0055] ② Based on the vibration test along the Y-axis, loosen the locking screws in the U-shaped through holes of the bottom brackets of the first transfer part and the second transfer part parallel to the X-axis, move the bottom brackets to make them close to the specimen mounting table, screw the locking screws of the mounting plate into the threaded holes of the transfer parts, and then tighten the locking screws in the U-shaped through holes. Loosen the locking screws connecting the vibration force conversion devices parallel to the Y-axis of the first transfer part and the second transfer part to the mounting plate, loosen the locking screws in the U-shaped through holes of the corresponding vibration force conversion devices, move the bottom brackets to make them move away from the specimen mounting table, and tighten them after the bottom brackets move away from the specimen mounting table. Screw the locking screws of the mounting plate into the threaded holes of the transfer parts, and then tighten the locking screws in the U-shaped through holes. Drive the vibration table to vibrate through the vibrating coil to achieve the vibration test along the X-axis and collect test data.

[0056] Horizontal test - along the Y-axis:

[0057] As Figure 11 and 12 shown, ① Based on the vertical test, loosen the locking screws in the U-shaped through holes of the bottom brackets of the first transfer part and the second transfer part parallel to the Y-axis, move the bottom brackets to make them close to the specimen mounting table, screw the locking screws of the mounting plate into the threaded holes of the transfer parts, and then tighten the locking screws in the U-shaped through holes. Loosen the locking screws fixing the locking pieces on the additional tabletop and the specimen mounting table to separate the locking pieces from the additional tabletop and the specimen mounting table, and then remove the transfer tabletop. Drive the vibration table to vibrate through the vibrating coil to achieve the vibration test along the Y-axis and collect test data.

[0058] ②On the basis of the vibration test along the X axis, loosen the locking screws in the U-shaped through holes of the bottom brackets of the first transfer part and the second transfer part parallel to the Y axis, move the bottom brackets to make them close to the specimen mounting table, screw the locking screws of the mounting plate into the threaded holes of the transfer part, and then tighten the locking screws in the U-shaped through holes; loosen the locking screws connecting the vibration force conversion devices of the first transfer part and the second transfer part parallel to the X axis to the mounting plate, loosen the locking screws in the U-shaped through holes of the corresponding vibration force conversion devices, move the bottom brackets to make them away from the specimen mounting table, and tighten them after the bottom brackets are away from the specimen mounting table, screw the locking screws of the mounting plate into the threaded holes of the transfer part, and then tighten the locking screws in the U-shaped through holes; drive the vibration table to vibrate through the vibrating coil to realize the vibration test along the Y axis and collect test data.

[0059] Example 3

[0060] As Figure 13 and Figure 14 shown, the test analysis method in this embodiment is based on the vibration test device in Embodiment 1, and the test piece to be tested is clamped for X, Y, and Z direction tests. The parameters for measuring the vibration test curve are usually vibration amplitude, vibration acceleration, and vibration frequency. The vibration curve is represented by coordinates, with the X axis being the frequency and the Y axis being the vibration amplitude or acceleration.

[0061] Step 1: Install the test piece and the three-axis vibration test device;

[0062] Step 2: According to the vibration test requirements, input and set the test input conditions, and set the limit values of the response test parameters (displacement amplitude, acceleration value);

[0063] Step 3: After installing the excitation control sensor on the "specimen mounting table" and the multi-point measurement response value sensors on the electronic product (including the vibration damping device), conduct tests in the X / Y / Z axial directions respectively, and collect vibration test data of the electronic product (including the vibration damping device) periodically according to the test requirements;

[0064] Step 3: Analyze the amplitude or acceleration of multiple vibration test data of multiple monitoring points and multiple cycles based on the frequency reference, that is, analyze the vibration acceleration or vibration amplitude at the same frequency respectively.

[0065] Step 4: Real-time judge whether the vibration response curve value exceeds the set response limit value. If it exceeds the limit value, automatically feedback to the test inspector through the QMS system and stop the vibration test.

[0066] Composition of the QMS vibration curve analysis system:

[0067] The QMS vibration curve analysis system consists of a computer, a vibration curve acquisition module, a curve analysis module, a curve judgment and warning module, and a communication module.

[0068] Initial value setting of vibration curve: According to the product characteristic requirements, set the X-axis as the frequency, the Y-axis as the vibration amplitude / acceleration. The upper limit of the vibration amplitude / acceleration and the allowable error value of the upper limit are determined according to the technical requirements of electronic products.

[0069] Vibration curve acquisition module: Collect vibration test data of multiple test points and multiple cycles;

[0070] Vibration curve analysis module: Based on the X-axis as the frequency reference point, synthesize the vibration amplitude or acceleration values of each point and each cycle, and measure the average value according to the cycle;

[0071] Curve judgment and warning module: If the analyzed value exceeds the allowable error, it is unqualified;

[0072] Communication module: Transmit the judgment data to the QMS system, warning the inspection and testing personnel that the test has become unqualified and stop the test.

[0073] Working process of the QMS vibration curve analysis system:

[0074] Taking the vibration sweep test with a vibration frequency of 1 - 1000Hz as an example, from low frequency to high frequency 1 - 1000Hz is 0.5 cycles, and then from high frequency to low frequency 1000 - 1Hz is 0.5 cycles. The whole is one test cycle.

[0075] Step 1: According to the vibration test requirements of the product under test, input the test control requirements. The X-axis is the frequency in Hz, the Y-axis is the amplitude A, and set the upper and lower limits of the amplitude;

[0076] Step 2: Through the sensor, perform multi-cycle measurement and acquisition on multiple points of the product under test, and collect the data of multiple cycles of each point, and map them to the same rectangular coordinate, as Figure 15 shown;

[0077] Step 3: Analyze the vibration curves of each point, perform summation statistical calculation of the measurement data of each frequency point to calculate the mean value,

[0078]

[0079] Among them, is the vibration mean value of a certain frequency point after analysis, and n is the number of cycles. According to the actual operation requirements of the vibration curve, the following analysis can be realized:

[0080] 1. Analyze a single vibration direction, single measurement point and multiple cycles;

[0081] 2. Analyze with a single vibration direction and multiple measurement points over multiple periods (based on a single measurement point);

[0082] 3. Analyze with multiple vibration directions and a single measurement point over multiple periods;

[0083] 4. Analyze with multiple vibration directions and multiple measurement points over multiple periods (based on a single measurement point);

[0084] Based on the analysis of each monitoring point, conduct result discrimination. If the result exceeds the upper and lower limit values, it is a non-conforming product. The vibration curve after analysis is as Figure 10 shown;

[0085] Step 4: According to the determination result, transmit the information to the QMS detection system to alert the inspection and test personnel to decide whether to continue the test.

Claims

1. A vibration test device, characterized in that, It includes a vibration device that provides the vibration direction of the Z-axis, a specimen mounting table for mounting vibration test specimens, which is arranged directly above the vibration device, a locking device arranged between the vibration device and the specimen mounting table, and at least two vibration force conversion devices. The vibration force conversion device includes a force input end and a force output end. The vibration force conversion device is used to vertically output the force received at the force input end from the force output end. The force input end of the vibration force conversion device is connected to the vibration device through a translation device, and the vibration force conversion device is located on the side of the specimen mounting table. The translation device is used to adjust the installation position of the vibration force conversion device on the vibration device, so that the force output end of the vibration force conversion device is far from or close to the specimen mounting table; when the specimen mounting table is fixedly connected to the vibration device through the locking device, the locking device is in a locked state, and the vibration device provides vibration in the Z-axis direction for the specimen mounting table; when the specimen mounting table is fixedly connected to the vibration device through the vibration force conversion device, the locking device is unlocked, the vibration force conversion device approaches the specimen mounting table and is connected to the specimen mounting table, and the vibration force conversion device converts the Z-axis direction vibration provided by the vibration device into X-axis or Y-axis direction vibration provided for the specimen mounting table; The vibration force conversion device includes a first conversion unit and a second conversion unit located on both sides of the specimen mounting table. The first conversion unit and the second conversion unit are connected to or not connected to the specimen mounting table at the same time. When the first conversion unit and the second conversion unit are connected to the specimen mounting table, they provide vibration in the same direction and on the same straight line for the specimen mounting table; The first conversion unit includes a bottom bracket, an angular bracket, and a first vibration transfer rod; the second conversion unit includes a bottom bracket, an angular bracket, and a second vibration transfer rod. The angular bracket includes a first angular side and a second angular side that are fixedly connected. An included angle is formed between the first angular side and the second angular side. The first angular side is fixedly connected to the bottom bracket, and the second angular side is connected to the first vibration transfer rod or the second vibration transfer rod; the first vibration transfer rod includes a first connection part and a first transfer part that are fixedly connected. A first included angle is formed between the first connection part and the first transfer part. The first connection part is connected to the second angular side of the angular bracket, and the first transfer part is connected to the specimen mounting table, and the first transfer part is parallel to the X-axis or the Y-axis. The second vibration transfer rod includes a second connection part and a second transfer part that are fixedly connected. A second included angle is formed between the second connection part and the second transfer part. The second connection part is connected to the second angular side of the angular bracket, and the second transfer part is connected to the specimen mounting table, and the second transfer part is on the same straight line as the first transfer part. The first included angle and the second included angle have the same degree and opposite directions.

2. The vibration test device according to claim 1, characterized in that The first angular side of the angular bracket is parallel to the X-axis or the Y-axis, and the included angle formed between the first angular side and the second angular side is a complementary angle to the first included angle or the second included angle.

3. The vibration test device according to claim 1, characterized in that, The specimen mounting table is square, and mounting plates are fixedly connected around the specimen mounting table. A number of mounting holes are provided on the mounting plates, and locking screws are provided in the mounting holes. Threaded holes are provided at the ends of the first transmission part and the second transmission part. By screwing the locking screws into the threaded holes of the first transmission part and the second transmission part, the connection between the vibration force conversion device and the specimen mounting table is realized.

4. The vibration test device according to claim 1, characterized in that, The translation device includes a U-shaped through hole provided on the bottom bracket and a locking screw provided on the vibration device. The locking screw is provided in the U-shaped through hole. By moving the bottom bracket and then tightening the locking screw, the adjustment of the installation position of the vibration force conversion device on the vibration device is realized.

5. The vibration test device according to claim 4, wherein The vibration device includes a vibrating moving coil, a vibration table fixedly provided at the output end of the vibrating moving coil, and an additional table surface provided on the upper end of the vibration table. The cross section of the additional table surface is smaller than that of the vibration table. The translation device is provided on the vibration table. The bottom bracket is tightened and positioned on the vibration table through the locking screw provided on the vibration table and is located on the side of the additional table surface. A number of through holes are provided on the additional table surface.

6. The vibration test device according to claim 5, wherein, The locking device includes a transfer table surface, a locking piece support fixedly provided on the transfer table surface, a locking piece hinged to the locking piece support, and locking screws provided on the additional table surface and the specimen mounting table. When the locking device is in the locked state, the transfer table surface is located between the specimen mounting table and the additional table surface, and the locking piece is tightened through the locking screws on the additional table surface and the specimen mounting table; when the locking device is in the unlocked state, the locking piece is separated from the locking screw, and the transfer table surface is moved out between the specimen mounting table and the additional table surface.

7. A vibration test method for the vibration test device according to claim 6, characterized in that, When performing a vibration test with the vibration direction along the Z axis, loosen the locking screws connecting the mounting plate and all vibration force conversion devices, then loosen the locking screws in the U-shaped through hole, and tighten them after the bottom bracket moves away from the specimen mounting table. Place the transfer table surface between the specimen mounting table and the additional table surface, and tighten the locking piece through the locking screws on the additional table surface and the specimen mounting table; When performing a vibration test with the vibration direction along the X / Y axis, loosen the locking screws in the U-shaped through hole, move the bottom bracket closer to the specimen mounting table, and tighten the locking screws connecting the mounting plate and the vibration force conversion device providing vibration in the X / Y axis direction. Then tighten the locking screws in the U-shaped through hole, loosen the locking screws connecting the locking piece, and move the transfer table surface out of the specimen mounting table and the additional table surface.

8. A test analysis method for the vibration test device according to claim 1, characterized in that, It includes the following steps: (1) Fix the specimen on the specimen mounting table; (2) Set the vibration test device according to the preset vibration test in the X / Y / Z axis directions; (3) Set the test input conditions and set the limit values of the response test parameters; (4) Conduct the test according to the test input conditions, and periodically collect the vibration test data of the specimen. The collected vibration test data includes vibration amplitude, vibration acceleration, and vibration frequency; (5) Analyze the vibration amplitude or vibration acceleration based on the vibration frequency of the vibration test data to form a vibration response curve; (6) Judge in real time whether the vibration amplitude or vibration acceleration value exceeds the set limit value of the response test parameters; If it exceeds, stop the vibration test.

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