A vibration test jig design method for a sensing portion and a vibration test jig

Abstract

The application provides a vibration test fixture design method for a sensitive part and a vibration test fixture. The method comprises the following steps: preparing an outer fixture with a frequency greater than a frequency threshold according to first design parameters; preparing an inner fixture with a frequency greater than the frequency threshold according to second design parameters; installing the inner fixture into a first interface of the outer fixture to form a combined fixture; performing frequency simulation on the combined fixture to obtain a first-order natural frequency of the combined fixture; if the first-order natural frequency of the combined fixture is less than or equal to the frequency threshold, adjusting the first design parameters and re-preparing the outer fixture, and / or adjusting the second design parameters and re-preparing the inner fixture until the first-order natural frequency of the combined fixture is greater than the frequency threshold. In summary, the design method of the fixture can improve the accuracy of the judgment of the natural frequency of the sensitive part and improve the compatibility of the tested sensitive part.

Description

Technical Field

[0001] This invention relates to the field of engine component testing, specifically to a design method and a vibration testing fixture for a sensing part. Background Technology

[0002] After the sensor design is completed, it must undergo vibration environment testing to determine its suitability for installation. During vibration environment testing, a dedicated fixture system is required to fix the sensor on a vibration table for the appropriate tests. For commonly used vibration environment tests (such as HB6167.6-2014 "Environmental Conditions and Test Methods for Airborne Equipment of Civil Aircraft Part 6: Vibration Test" and GJB150.16A-2009 "Laboratory Environmental Test Methods for Military Equipment Part 16: Vibration Test"), the designed fixture is generally required to avoid the natural frequency band of interest for the sensor. Since the vibration frequency range in engine vibration testing is less than 2000Hz, the designed fixture must meet the requirement that the first-order natural frequency exceeds 2000Hz.

[0003] In order to ensure that the designed sensor fixture can meet the vibration test requirements, in practical use, a general-purpose fixture is often designed to facilitate adjustment and suitability for sensors of different shapes. However, the natural frequency of the general-purpose fixture is often low and less than 2000Hz, which will partially overlap and interfere with the frequency band of the sensor, affecting the determination of the natural frequency of the sensor. On the other hand, if a special fixture is designed for each sensor, there will be problems such as large design workload, high processing cost, and long processing cycle.

[0004] In summary, the fixtures used for vibration testing of the sensing part in related technologies have the problem of not being able to simultaneously ensure the accuracy and compatibility of the natural frequency determination of the sensing part. Summary of the Invention

[0005] This invention provides a design method and a vibration test fixture for a sensing part, which can improve the accuracy of the determination of the natural frequency of the sensing part while improving compatibility.

[0006] In a first aspect, this application discloses a method for designing a vibration testing fixture for a sensor, comprising:

[0007] The process of fabricating the external clamp is as follows: the external clamp is fabricated according to the first design parameters so that the first natural frequency of the external clamp is greater than the frequency threshold; wherein, the external clamp is provided with a first interface for mounting the inner clamp, and the frequency threshold is the first natural frequency of the sensing part;

[0008] The inner clamp is prepared according to the second design parameters, so that the first natural frequency of the inner clamp is greater than the frequency threshold.

[0009] The simulation and verification process for the assembled fixture includes:

[0010] The inner clamp is installed into the first interface of the outer clamp to form a combined clamp;

[0011] Frequency simulation was performed on the combined fixture to obtain its first-order natural frequency.

[0012] If the first natural frequency of the combined fixture is less than or equal to the frequency threshold, then the first design parameters are adjusted and the outer fixture is re-made, and / or the second design parameters are adjusted and the inner fixture is re-made, until the first natural frequency of the combined fixture is greater than the frequency threshold.

[0013] Optionally, the manufacturing process of the external clamp includes:

[0014] Step S100: Design a three-dimensional model of the external fixture based on the first design parameters;

[0015] Step S200: Perform frequency simulation on the designed external clamp to obtain the first-order natural frequency of the external clamp;

[0016] Step S300: If the first natural frequency of the external fixture is less than or equal to the frequency threshold, adjust the first design parameter and return to step S100 until the first natural frequency of the external fixture is greater than the frequency threshold.

[0017] Step S400: Prepare the external clamp according to the first design parameters.

[0018] Optionally, the manufacturing process of the inner clamp includes:

[0019] Step B100: Design the three-dimensional model of the internal fixture according to the second design parameters;

[0020] Step B200: Perform frequency simulation on the designed inner clamp to obtain the first natural frequency of the inner clamp;

[0021] Step B300: If the first natural frequency of the inner fixture is less than or equal to the frequency threshold, adjust the second design parameters and return to step B100 until the first natural frequency of the inner fixture is greater than the frequency threshold.

[0022] Step B400: Prepare the inner clamp according to the second design parameters.

[0023] Optionally, the combined fixture simulation and verification process includes:

[0024] If the first natural frequency of the combined fixture is less than or equal to the frequency threshold, the first design parameters are adjusted and the outer fixture is re-made until the first natural frequency of the combined fixture is greater than the frequency threshold.

[0025] Optionally, the first interface of the outer clamp can be equipped with n inner clamps of different specifications, and the n inner clamps of different specifications are: #1 inner clamp to #n inner clamp, and the second design parameters corresponding to each inner clamp are different; the outer clamp and the #i inner clamp are combined to form the #i combined clamp; where n is an integer and n≥2, 1≤i≤n;

[0026] The simulation and verification process of the combined fixture includes:

[0027] Step M100: Install one of the inner clamps into the first interface of the outer clamp to form a combined clamp;

[0028] Step M200: Perform frequency simulation on the combined fixture to obtain the first-order natural frequency of the combined fixture;

[0029] Step M300: Verify the first natural frequency of the combined fixture. If the frequency of the combined fixture is less than or equal to the frequency threshold, adjust the first design parameters and re-prepare the external fixture until the first natural frequency of the combined fixture is greater than the frequency threshold.

[0030] Step M400: Replace the inner fixture in the combined fixture and return to step M200 until the first-order natural frequencies of combined fixtures #1 to #n are all greater than the frequency threshold.

[0031] Optionally, the frequency threshold is 2000 Hz.

[0032] Optionally, the first design parameter includes at least one of the height, width, and length dimensions of the external clamp.

[0033] Optionally, the second design parameter includes at least one of the height, width, and length dimensions of the inner clamp.

[0034] Secondly, this application discloses a vibration testing fixture for a sensing part, comprising:

[0035] An external clamp, wherein the external clamp is provided with a first interface;

[0036] An inner clamp is provided in the first interface, and the inner clamp is provided with a second interface for mounting the sensing part;

[0037] The first natural frequency of the outer clamp, the first natural frequency of the inner clamp, and the first natural frequency of the vibration test clamp are all greater than the first natural frequency of the sensing part.

[0038] Optionally, the external clamp includes a base and a boss, with the first interface located on the boss.

[0039] Optionally, it also includes at least one of the top-pressure bolt and the side-pressure bolt; wherein

[0040] The top-pressing bolt is threaded to the top of the boss and can extend into the first interface;

[0041] The side-pressure bolt is threaded to the side of the boss and can extend into the first interface.

[0042] Optionally, the end face of the inner clamp is provided with mounting screw holes for mounting the sensing part.

[0043] The beneficial effects of this invention are as follows:

[0044] This application discloses a design method for a vibration testing fixture for a sensed part, including:

[0045] The process of fabricating the external clamp is as follows: the external clamp is fabricated according to the first design parameters so that the first natural frequency of the external clamp is greater than the frequency threshold; wherein, the external clamp is provided with a first interface for mounting the inner clamp, and the frequency threshold is the first natural frequency of the sensing part;

[0046] The inner clamp is prepared according to the second design parameters, so that the first natural frequency of the inner clamp is greater than the frequency threshold.

[0047] The simulation and verification process for the assembled fixture includes:

[0048] The inner clamp is installed into the first interface of the outer clamp to form a combined clamp;

[0049] Frequency simulation was performed on the combined fixture to obtain its first-order natural frequency.

[0050] If the first natural frequency of the combined fixture is less than or equal to the frequency threshold, then the first design parameters are adjusted and the outer fixture is re-made, and / or the second design parameters are adjusted and the inner fixture is re-made, until the first natural frequency of the combined fixture is greater than the frequency threshold.

[0051] According to the design concept of the vibration test fixture of the present invention, in the first aspect, the first-order natural frequency of both the inner and outer fixtures is ensured to be greater than the first-order natural frequency of the sensing part, and further, the first-order natural frequency of the assembled fixture is ensured to be greater than the first-order natural frequency of the sensing part, thereby avoiding interference when judging the natural frequency of the sensing part and improving the accuracy of the judgment. In the second aspect, the outer fixture is a universal fixture, and the inner fixture can be replaced with different specifications according to the sensing part being tested, without the need to design a special fixture for each sensing part separately, thereby improving the fixture compatibility and reducing the design workload, processing cost and processing cycle.

[0052] In summary, the fixture of this application can improve the accuracy of determining the natural frequency of the sensing element while also improving the compatibility of the tested sensing element. Attached Figure Description

[0053] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related characteristics or features may have the same or similar reference numerals.

[0054] Figure 1 This is a flowchart of the fixture design for this invention;

[0055] Figure 2 This is a structural diagram of the fixture of the present invention;

[0056] Figure 3 This is the present invention. Figure 1 Structure diagram of the sensor unit;

[0057] Figure 4 This is a structural diagram of the external clamp of the present invention;

[0058] Figure 5 This is a structural diagram of the internal clamp of the present invention.

[0059] Explanation of reference numerals in the attached figures:

[0060] 10-Receptor region

[0061] 100-External clamp,

[0062] 110-base,

[0063] 111-Installation through hole,

[0064] 120-convex surface

[0065] 121-First interface, 122-Placement surface,

[0066] 200-Internal clamp,

[0067] 201 - Second interface, 202 - Top surface of inner clamp, 203 - Side surface of inner clamp, 204 - Mounting screw hole

[0068] 300-Top-pressure bolt,

[0069] 400-Side pressure bolt. Detailed Implementation

[0070] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0071] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0072] The following is combined with Figures 1-5 This invention is described.

[0073] Please refer to Figures 2-5 This invention discloses a vibration test fixture for a sensing element 10. The vibration test fixture includes an outer fixture 100 and an inner fixture 200, which can be made of 45 steel or cast iron. The outer fixture 100 has a first interface 121, which can be a through-hole square hole for easy manufacturing. The inner fixture 200 is disposed in the first interface 121 and is typically a cuboid. The inner fixture 200 has a second interface 201 for mounting the sensing element 10, and its dimensions are designed according to the specifications of the sensing element 10.

[0074] In this application, the first-order natural frequency of the outer clamp 100, the first-order natural frequency of the inner clamp 200, and the first-order natural frequency of the vibration test fixture composed of the outer clamp 100 and the inner clamp 200 are all greater than the first-order natural frequency of the sensing part. Furthermore, the first-order natural frequency of the inner clamp 200 is often greater than 10,000 Hz, falling within the 10,000 Hz range, easily meeting the requirement of greater than 2,000 Hz. This avoids interference in determining the natural frequency of the sensing part during vibration testing, improving the accuracy of the determination. Simultaneously, the outer clamp 100 is a universal fixture, and the inner clamp 200 can be replaced with different specifications according to the sensing part 10 being tested, eliminating the need to design a dedicated fixture for each sensing part. This improves fixture compatibility, thereby reducing design workload, processing costs, and processing cycle. In summary, using the fixture of this application can improve the accuracy of determining the natural frequency of the sensing part while also improving the compatibility of the tested sensing parts.

[0075] Optionally, the external clamp 100 includes a base 110 and a boss 120, with the first interface 121 located on the boss 120. The base 110 is disc-shaped and has several mounting through holes 111, such as 6 to 15, for threading bolts to fix the base 110 to a platform or similar location. The boss 120 is a truncated pyramid structure that easily meets the requirement of a first-order natural frequency greater than 2000Hz. The bottom surface of the first interface 121 in the boss 120 serves as the placement surface 122 of the sensing part 10. Typically, the placement surface 122 protrudes from the base 110, and the height difference between the two surfaces is generally 5 to 10 mm, facilitating machining and forming.

[0076] Optionally, the vibration test fixture may also include at least one of a top pressure bolt 300 and a side pressure bolt 400. For example, the vibration test fixture may only have a top pressure bolt 300, or it may only have a side pressure bolt 400, or it may have both a top pressure bolt 300 and a side pressure bolt 400. The bolt strength of the top pressure bolt 300 and the side pressure bolt 400 may be set to grade 12.9 or higher to ensure service life.

[0077] The top-pressing bolt 300 is threaded to the top of the boss 120 and can extend into the first interface 121 to abut against the top surface 202 of the inner clamp, thereby clamping the inner clamp 200 from top to bottom and fixing it between the top-pressing bolt 300 and the placement surface 122. Three top-pressing bolts 300 can be provided on the top of the boss 120.

[0078] The side-pressure bolt 400 is threaded to the side of the boss 120 and can extend into the first interface 121 to abut against the side 203 of the inner clamp, thereby clamping the inner clamp 200 from both sides and fixing it between the two sides of the boss 120. Furthermore, one side-pressure bolt 400 can be provided on each of the left and right sides of the boss 120 to better achieve left and right clamping of the inner clamp 200.

[0079] Optionally, the end face of the inner clamp 200 is provided with mounting screw holes 204 for mounting the sensing part 10, and a plurality of mounting screw holes 204 are provided around the second interface 201. When mounting the sensing part 10, the mounting bolts pass through the through holes and mounting screw holes 204 provided on the sensing part 10 in sequence, thereby fixing the sensing part 10 on the inner clamp 200.

[0080] The following is combined with Figure 1 This paper introduces a design method for vibration testing fixtures for the sensed part, including:

[0081] Step a, the outer clamp 100 is prepared: the outer clamp 100 is prepared according to the first design parameters so that the first natural frequency of the outer clamp 100 is greater than the frequency threshold of 2000Hz; wherein, the outer clamp 100 is provided with a first interface 121 for mounting the inner clamp 200, and the frequency threshold is the first natural frequency of the sensing part, which is usually 2000Hz; the first design parameters usually include at least one of the height dimension, width dimension and length dimension of the outer clamp 100, wherein the height direction of the outer clamp 100 is the protruding direction of the boss 120, the width direction is the through direction of the first interface 121, and the length direction is perpendicular to the height direction and the width direction.

[0082] Step b involves the fabrication of the inner clamp 200: the inner clamp 200 is fabricated according to the second design parameters, such that the first-order natural frequency of the inner clamp 200 is greater than the frequency threshold of 2000Hz. The second design parameters include at least one of the height, width, and length dimensions of the inner clamp 200, wherein the height direction of the inner clamp 200 is the protruding direction of the boss 120, the width direction is the through direction of the second interface 201, and the length direction is perpendicular to the height and width directions.

[0083] Step d involves performing simulation and verification of the assembled fixture, including:

[0084] Step d1: Install the inner clamp 200 into the first interface 121 of the outer clamp 100 and place it on the placement surface 122; then tighten the top pressure bolt 300 to clamp the inner clamp 200 vertically and secure it between the top pressure bolt 300 and the placement surface 122; and tighten the side pressure bolts 400 from the left and right sides to clamp the inner clamp 200 horizontally and secure it between the two sides of the boss 120, thereby forming a combined clamp.

[0085] Step d2: Perform frequency simulation on the combined fixture to obtain the first-order natural frequency of the combined fixture;

[0086] Step d3, perform frequency verification of the combined fixture: if the first natural frequency of the combined fixture is less than or equal to the frequency threshold of 2000Hz, then adjust the first design parameters and re-prepare the outer fixture 100, and / or adjust the second design parameters and re-prepare the inner fixture 200, until the first natural frequency of the combined fixture is greater than the frequency threshold of 2000Hz.

[0087] According to the design concept of the vibration test fixture of the present invention, in the first aspect, after ensuring that the first-order natural frequency of the inner and outer fixtures is greater than the first-order natural frequency of the sensing part, it is further ensured that the first-order natural frequency of the assembled fixture is greater than the first-order natural frequency of the sensing part 10, thereby avoiding interference when judging the natural frequency of the sensing part 10 and improving the accuracy of the judgment. In the second aspect, the outer fixture 100 is a general-purpose fixture, and the inner fixture 200 can be replaced with different specifications according to the sensing part being tested, without the need to design a special fixture for each sensing part, thereby improving the fixture compatibility and reducing the design workload, processing cost and processing cycle. In summary, using the fixture of this application can improve the accuracy of judging the natural frequency of the sensing part while improving the compatibility of the tested sensing parts.

[0088] Optionally, step a, the preparation process of the outer clamp 100, includes:

[0089] Step S100: Design a three-dimensional model of the external clamp 100 according to the first design parameters.

[0090] Step S200: Perform frequency simulation on the designed external clamp 100 to obtain the first-order natural frequency of the external clamp 100.

[0091] Step S300: If the first natural frequency of the external clamp 100 is less than or equal to the frequency threshold, adjust the first design parameter and return to step S100 until the first natural frequency of the external clamp 100 is greater than the frequency threshold of 2000Hz.

[0092] Step S400: Prepare the external clamp 100 according to the first design parameters.

[0093] Optionally, step b, the preparation process of the inner clamp 200, includes:

[0094] Step B100: Design a three-dimensional model of the inner fixture 200 according to the second design parameters;

[0095] Step B200: Perform frequency simulation on the designed inner clamp 200 to obtain the first natural frequency of the inner clamp 200;

[0096] Step B300: If the first natural frequency of the inner clamp 200 is less than or equal to the frequency threshold, adjust the second design parameters and return to step B100 until the first natural frequency of the inner clamp 200 is greater than the frequency threshold of 2000Hz.

[0097] Step B400: Prepare the inner clamp 200 according to the second design parameters.

[0098] Optionally, since the first-order natural frequency of the inner fixture 200 is often in the tens of thousands of Hz range, it is easy to meet the requirement of greater than 2000 Hz. Therefore, step d3 only needs to improve the first design parameters of the outer fixture 100, such as reducing the height of the boss 120 and adjusting the width and length of the boss 120, thereby simplifying the design process. Then, in step d3, the combined fixture simulation and verification process includes:

[0099] If the first natural frequency of the combined fixture is less than or equal to the frequency threshold, the first design parameters are adjusted and the outer fixture 100 is prepared again until the first natural frequency of the combined fixture is greater than the frequency threshold of 2000Hz.

[0100] Optionally, as described above, the first interface 121 of the outer clamp 100 can accommodate n inner clamps 200 of different specifications, and the n inner clamps 200 of different specifications are: #1 inner clamp 200 to #n inner clamp 200, and the second design parameters corresponding to each inner clamp 200 are different; the outer clamp 100 and the #i inner clamp 200 are combined to form the #i combined clamp; where n is an integer and n≥2, 1≤i≤n;

[0101] Therefore, the simulation and verification process of the combined fixture in step d includes:

[0102] Step M100: Install one of the inner clamps 200 into the first interface 121 of the outer clamp 100 to form a combined clamp;

[0103] Step M200: Perform frequency simulation on the combined fixture to obtain the first-order natural frequency of the combined fixture;

[0104] Step M300: Verify the first natural frequency of the combined fixture. If the frequency of the combined fixture is less than or equal to the frequency threshold of 2000Hz, adjust the first design parameters and re-prepare the outer fixture 100 until the first natural frequency of the combined fixture is greater than the frequency threshold.

[0105] Step M400: Replace the inner fixture 200 in the combined fixture and return to step M200 until the first-order natural frequency of combined fixtures #1 to #n is greater than the frequency threshold of 2000Hz.

[0106] The simulation and verification process of the combined fixture described in step d is illustrated below with a specific example:

[0107] The #1 inner clamp is installed into the first interface 121 of the outer clamp 100 to form the #1 combined clamp;

[0108] Frequency simulation was performed on the #1 assembly fixture to obtain its first natural frequency.

[0109] Verify the first natural frequency of the #1 combined fixture. If the frequency of the #1 combined fixture is less than or equal to the frequency threshold, adjust the first design parameters and re-prepare the outer fixture 100 until the first natural frequency of the #1 combined fixture is greater than the frequency threshold.

[0110] The #2 inner clamp is installed into the first interface 121 of the outer clamp 100 to form the #2 combined clamp;

[0111] Frequency simulation was performed on the #2 assembly fixture to obtain its first natural frequency.

[0112] Verify the first natural frequency of the #2 combined fixture. If the frequency of the #2 combined fixture is less than or equal to the frequency threshold, adjust the first design parameters and re-prepare the outer fixture 100 until the first natural frequencies of both the #1 and #2 combined fixtures are greater than the frequency threshold. ........

[0114] The #n inner clamp is installed into the first interface 121 of the outer clamp 100 to form the #n combined clamp;

[0115] Frequency simulation was performed on the #n combined fixture to obtain its first natural frequency.

[0116] Verify the first natural frequency of the #n combination fixture. If the frequency of the #n combination fixture is less than or equal to the frequency threshold, adjust the first design parameters and re-prepare the outer fixture 100 until the first natural frequencies of the #1 to #n combination fixtures are all greater than the frequency threshold.

[0117] Thus, if the first natural frequencies of all the fixtures from #1 to #n are greater than the frequency threshold of 2000Hz, the vibration test fixture design is complete and subsequent tests can be carried out.

[0118] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for designing a vibration test fixture for a sensing part (10), characterized in that, include: The outer clamp (100) is prepared according to the first design parameters so that the first natural frequency of the outer clamp (100) is greater than the frequency threshold; wherein the outer clamp (100) is provided with a first interface (121) for installing the inner clamp (200), and the frequency threshold is the first natural frequency of the sensing part. The inner clamp (200) is prepared according to the second design parameters so that the first natural frequency of the inner clamp (200) is greater than the frequency threshold. The simulation and verification process for the assembled fixture includes: The inner clamp (200) is installed into the first interface (121) of the outer clamp (100) to form a combined clamp; Frequency simulation was performed on the combined fixture to obtain its first-order natural frequency. If the first natural frequency of the combined fixture is less than or equal to the frequency threshold, the first design parameters are adjusted and the outer fixture (100) is prepared again, and / or the second design parameters are adjusted and the inner fixture (200) is prepared again, until the first natural frequency of the combined fixture is greater than the frequency threshold.

2. The design method according to claim 1, characterized in that, The preparation process of the external clamp (100) includes: Step S100: Design a three-dimensional model of the external fixture (100) according to the first design parameters; Step S200: Perform frequency simulation on the designed external clamp (100) to obtain the first natural frequency of the external clamp (100); Step S300: If the first natural frequency of the external clamp (100) is less than or equal to the frequency threshold, then adjust the first design parameter and return to step S100 until the first natural frequency of the external clamp (100) is greater than the frequency threshold. Step S400: Prepare the external clamp (100) according to the first design parameters.

3. The design method according to claim 1, characterized in that, The preparation process of the inner clamp (200) includes: Step B100: Design a three-dimensional model of the inner fixture (200) according to the second design parameters; Step B200: Perform frequency simulation on the designed inner clamp (200) to obtain the first natural frequency of the inner clamp (200); Step B300: If the first natural frequency of the inner clamp (200) is less than or equal to the frequency threshold, adjust the second design parameters and return to step B100 until the first natural frequency of the inner clamp (200) is greater than the frequency threshold. Step B400: Prepare the inner clamp (200) according to the second design parameters.

4. The design method according to claim 1, characterized in that, The simulation and verification process for the combined fixture includes: If the first natural frequency of the combined fixture is less than or equal to the frequency threshold, the first design parameters are adjusted and the outer fixture (100) is prepared again until the first natural frequency of the combined fixture is greater than the frequency threshold.

5. The design method according to claim 4, characterized in that, The first interface (121) of the outer clamp (100) can install n inner clamps (200) of different specifications. The n inner clamps (200) of different specifications are: #1 inner clamp (200) to #n inner clamp (200). The second design parameters corresponding to each inner clamp (200) are different. The outer clamp (100) and the #i inner clamp (200) are combined to form the #i combined clamp. Wherein, n is an integer and n≥2, 1≤i≤n. The simulation and verification process of the combined fixture includes: Step M100: Install one of the inner clamps (200) into the first interface (121) of the outer clamp (100) to form a combined clamp; Step M200: Perform frequency simulation on the combined fixture to obtain the first-order natural frequency of the combined fixture; Step M300: Verify the first natural frequency of the combined fixture. If the frequency of the combined fixture is less than or equal to the frequency threshold, adjust the first design parameters and re-prepare the outer fixture (100) until the first natural frequency of the combined fixture is greater than the frequency threshold. Step M400: Replace the inner fixture (200) in the combination fixture and return to step M200 until the first natural frequency of combination fixtures #1 to #n is greater than the frequency threshold.

6. The design method according to claim 1, characterized in that, The frequency threshold is 2000 Hz.

7. The design method according to claim 1, characterized in that, The first design parameter includes at least one of the height, width and length dimensions of the external clamp (100).

8. The design method according to claim 1, characterized in that, The second design parameter includes at least one of the height, width, and length dimensions of the inner clamp (200).

9. A vibration testing fixture for a sensing part (10), characterized in that, include: An external clamp (100) is provided with a first interface (121); An inner clamp (200) is provided in the first interface (121), and the inner clamp (200) is provided with a second interface (201) for mounting the sensing part (10); The first natural frequency of the outer clamp (100), the first natural frequency of the inner clamp (200), and the first natural frequency of the vibration test clamp are all greater than the first natural frequency of the sensing part.

10. The vibration testing fixture according to claim 9, characterized in that, The external clamp (100) includes a base (110) and a boss (120), and the first interface (121) is provided on the boss (120).

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