A closed type flexible vibration fixture and a vibration test method thereof

Abstract

The present application relates to the technical field of vibration test, aiming at solving the problem that the existing vibration fixture without adaptive built-in antenna cannot adapt to special-shaped built-in antenna and cannot simulate the support stiffness and real dynamic boundary conditions in the antenna aperture, and provides a closed flexible vibration fixture and a vibration test method thereof, which comprises a bottom plate, a reinforcing plate, a side plate, a mounting plate, an upper cover plate, a lower cover plate, a rubber plate and an adapter block; the bottom plate is provided with a plurality of fixing holes; the mounting plate is provided with a built-in antenna; the rubber plate comprises an upper rubber plate and a lower rubber plate; the upper cover plate and the upper rubber plate are respectively provided with a first rectangular groove and a second rectangular groove at the same position; the adapter block is located in the first rectangular groove and the second rectangular groove and is bonded to the upper surface of the built-in antenna; and the remaining surfaces of the adapter block are bonded with acceleration sensors.The present application has the beneficial effects of accurately simulating the real working environment of the built-in antenna, adapting to special-shaped part test, being stable in structure, being faithful in energy transmission, directly monitoring the response and adapting to multiple working conditions, and improving the test accuracy.

Description

Technical Field

[0001] This invention relates to the field of vibration testing technology, and more specifically, to a closed flexible vibration fixture and its vibration testing method. Background Technology

[0002] Vibration testing is an important part of product environmental testing. It is used to verify the product's shock resistance, discover design, process and manufacturing defects, and understand the product's stress response characteristics. An ideal vibration fixture should avoid resonance with the product and be able to transfer the energy of the vibration table to the test piece without distortion.

[0003] With the development of advanced aircraft platforms, the common aperture arrangement of antenna elements has become an important way to achieve multi-band operation. The antenna aperture is mainly arranged in the airframe structure in two forms: embedded and conformal. The vibration test requirements of the two are significantly different. The curved conformal antenna can be subjected to vibration test as a whole with the antenna aperture, while the embedded antenna is a low-profile antenna placed in the embedded cavity of the aircraft body after optimization. Its vibration test not only requires the dynamic load to be consistent with the actual working state, but the fixture also needs to provide dynamic boundary conditions that match the actual structure. At present, there is no special vibration fixture suitable for this type of test requirements.

[0004] Existing vibration fixture technologies still have significant limitations. For example, the adjustable vibration fixture disclosed in CN221621983U matches different sized boxes by adjusting the slots on the crossbar, so that the box can be stably fixed on the vibration table to meet the requirements of box vibration testing. However, it can only match regular rectangular structural parts such as boxes by adjusting the slots, and cannot be applied to irregular test pieces such as embedded antennas. The general-purpose vibration fixture in CN114427946A is adapted to airborne display products by changing the special panel, and CN115031913A matches different sized boxes by adjusting the slots on the crossbar, so that the box can be stably fixed on the vibration table to meet the requirements of box vibration testing. However, the large vibration fixture in CN115031913A focuses on ensuring the transmission of excitation force in long-distance flexible extension mechanism tests. The above technologies cannot simulate the support stiffness of embedded antennas within the antenna aperture, and are difficult to meet the vibration test requirements of embedded antennas. Therefore, there is an urgent need to design a closed flexible vibration fixture adapted to embedded antennas. Summary of the Invention

[0005] The present invention aims to provide a closed flexible vibration fixture and its vibration testing method to solve the problems in the prior art that there is no dedicated vibration fixture adapted to embedded antennas, and that existing fixtures cannot adapt to irregularly shaped embedded antennas, nor can they simulate the support stiffness and real dynamic boundary conditions within the antenna aperture.

[0006] The embodiments of the present invention are implemented as follows: This invention provides a closed flexible vibration clamp, which includes a base plate, a reinforcing plate, a side plate, a mounting plate, an upper cover plate, a lower cover plate, a rubber plate, and a transition block; The mounting plate and the side plates on both sides are mechanically connected as a whole and then screwed onto the base plate. The reinforcing plate is installed on the base plate and fixed to the side plates. The base plate has a number of fixing holes for fixing to the vibration test bench. An embedded antenna is installed inside the mounting plate. The rubber plate includes an upper rubber plate and a lower rubber plate, which are respectively laid on the upper and lower surfaces of the embedded antenna. The upper cover plate is attached to the upper rubber plate, the lower cover plate is attached to the lower rubber plate, the two sides of the upper cover plate and the lower cover plate are locked to the side plate, the upper cover plate and the lower cover plate are locked to the mating surface of the mounting plate, and the ends of the upper cover plate and the lower cover plate are locked to each other. The upper surface of the upper cover plate has a first rectangular groove, and the upper rubber plate has a second rectangular groove corresponding to the position of the first rectangular groove. The adapter block is placed in the first rectangular groove and the second rectangular groove, and the adapter block is bonded to the upper surface of the embedded antenna. An acceleration sensor is bonded to the remaining surface of the adapter block.

[0007] This embodiment discloses a closed flexible vibration fixture. By constructing a stable fixture base using the aforementioned base plate, reinforcing plate, side plate, and mounting plate, and combining it with the aforementioned rubber plate that can conform to the upper and lower surfaces of the embedded antenna to simulate the flexible support boundary within the antenna aperture, and by forming a closed cavity with the aforementioned upper and lower cover plates locked at multiple positions, it ensures that the energy of the vibration table is transmitted to the embedded antenna specimen without distortion, and accurately reproduces the dynamic boundary conditions of the actual operation of the embedded antenna. Furthermore, because the aforementioned upper cover plate and the aforementioned upper rubber plate have corresponding first and second rectangular slots and an adapter block for bonding with the embedded antenna is built in, the accelerometer on the adapter block can directly monitor the antenna. The linear acceleration response enables precise detection of the vibration test process. Furthermore, the rubber plate can be flexibly replaced with different thicknesses to adapt to various installation environment simulation requirements of the embedded antenna. The overall structural design balances the realism, stability, and adaptability of the test, effectively solving the technical problems of existing fixtures being unable to adapt to irregularly shaped embedded antennas and simulate their true support stiffness and dynamic boundary conditions. This significantly improves the accuracy and reliability of the embedded antenna vibration test results. Consequently, this enclosed flexible vibration fixture can accurately simulate the real working environment of embedded antennas, adapt to irregularly shaped component tests, has a stable structure, maintains accurate energy transfer, directly monitors the response, and adapts to multiple working conditions, thus improving test accuracy.

[0008] Optionally, the mounting plate is mechanically connected to the side plates on both sides by screws, and the number of reinforcing plates is four, and the reinforcing plates are installed on the base plate and the side plates on both sides by screws.

[0009] This configuration enables rapid and precise assembly of all components, and the arrangement of reinforcing plates in multiple locations significantly improves the overall rigidity and structural stability of the fixture base. At the same time, the screw connection facilitates subsequent disassembly and maintenance, making it suitable for the vibration testing requirements of embedded antennas.

[0010] Optionally, the base plate, side plate, reinforcing plate and mounting plate are fixedly connected by welding.

[0011] This configuration allows the core structural components of the fixture base to form a stable integrated structure, significantly improving the overall rigidity and structural strength of the base. It effectively prevents relative displacement between components during vibration testing, ensuring that the energy of the vibration table can be transmitted to the embedded antenna specimen without distortion. At the same time, it improves the structural stability and service life of the fixture under vibration conditions.

[0012] Optionally: the upper cover plate and the lower cover plate are provided with first threaded holes at the surface reinforcing ribs, and the upper cover plate and the lower cover plate are provided with a plurality of second threaded holes on the mating surfaces with the mounting plate, and the upper cover plate and the lower cover plate are provided with screw through holes at their ends. The aforementioned upper cover plate, the aforementioned lower cover plate, and the aforementioned side plate are connected by screws. The aforementioned upper cover plate, the aforementioned lower cover plate, and the aforementioned mounting plate are connected by screws. The aforementioned screw holes at the ends of the aforementioned upper cover plate and the aforementioned lower cover plate are connected by bolts and nuts.

[0013] This configuration allows for locking connections with the side plates and mounting plates via screws, and the screw holes at the ends of the upper and lower cover plates are secured using bolts and nuts. This multi-position, multi-method locking structure design ensures that the upper and lower cover plates and the rubber plate reach the preset compression amount. Simultaneously, it creates a stable, rigid, closed cavity between the upper and lower cover plates and the fixture base, effectively preventing loosening or relative displacement of the connection points during vibration testing. This ensures that the energy of the vibration table is transmitted to the embedded antenna specimen without distortion, improving the overall structural stability of the fixture and the accuracy of the vibration test.

[0014] Optionally, both the upper rubber sheet and the lower rubber sheet are silicone rubber sheets, and the upper rubber sheet and the lower rubber sheet have different thicknesses.

[0015] With this setup, the upper and lower rubber plates are made of silicone rubber, whose flexibility can accurately simulate the flexible support boundaries such as honeycomb and foam that the embedded antenna actually contacts within the antenna aperture, thus restoring the real dynamic boundary conditions. At the same time, by setting silicone rubber plates of different thicknesses, the compression ratio can be flexibly adjusted to match the simulation requirements of different installation environments of the embedded antenna, adapting to various vibration test conditions and improving the accuracy and adaptability of the test results.

[0016] Optionally, the above-mentioned upper cover plate, the above-mentioned lower cover plate, the above-mentioned side plate, the above-mentioned reinforcing plate, the above-mentioned bottom plate, and the above-mentioned mounting plate are all made of aluminum alloy or high specific stiffness metal material.

[0017] This design ensures that each structural component of the fixture has excellent rigidity and strength, effectively preventing deformation and resonance during vibration testing and ensuring that the energy of the vibration table is transmitted to the embedded antenna without distortion. It also takes into account the lightweight requirements of the fixture, reducing the load pressure on the vibration test table. In addition, this type of material is compatible with various connection methods such as welding and screwing, ensuring the overall assembly stability and structural reliability of the fixture.

[0018] Optionally, the mounting plate is provided with several countersunk holes, and the embedded antenna is fixed to the mounting plate by screws engaging with the countersunk holes.

[0019] This design allows the countersunk head of the screw to be recessed into the surface of the mounting plate, making the screw more aesthetically pleasing and ensuring the depth of the screw thread insertion. This improves the stability of the embedded antenna installation and ensures the flatness of the embedded antenna against the mounting plate. At the same time, the fit between the screw and the countersunk hole ensures a secure fixation of the embedded antenna, preventing it from loosening or shifting during vibration testing, thus ensuring the stability of the test process and the accuracy of the test results.

[0020] In one embodiment of this invention, a vibration testing method for a closed flexible vibration fixture is also provided, comprising the following steps: Step 1: Screw the mounting plate onto the side plates on both sides, then align the mounting plate and side plates together with the positioning groove on the base plate and fix them with screws. Then install the reinforcing plates on both sides and weld the reinforcing plates to the base plate and side plates to form the entire fixture base. Step 2: Fix the base plate of the above-mentioned fixture base to the vibration test bench using screws; Step 3: Secure the embedded antenna to the mounting plate with screws; Step 4: Apply rubber sheets to the upper and lower surfaces of the embedded antenna, respectively. Step 5: Secure the upper and lower cover plates to the side plates and mounting plates on both sides with screws, and then lock the end joints of the upper and lower cover plates with bolts and nuts to form a closed cavity. Step 6: Pass the adapter block through the first and second rectangular slots of the upper cover plate and the upper rubber plate, and attach it to the upper surface of the embedded antenna. Then, attach the accelerometer to the remaining surface of the adapter block. Step 7: Turn on the vibration testing equipment and conduct a vibration test on the above-mentioned embedded antenna; Step 8: Collect the end acceleration response of the embedded antenna using an accelerometer, and adjust the thickness of the rubber sheet based on the acceleration response feedback.

[0021] Optionally: In step five, when the screw connection is tightened, the upper cover plate and the upper rubber plate, and the lower cover plate and the lower rubber plate reach a preset compression amount.

[0022] This configuration allows for precise control of the deformation of the rubber plate, ensuring it fits the embedded antenna and simulates the true stiffness and dynamic boundary conditions of the flexible support within the antenna aperture. Simultaneously, the preset compression ensures stable contact between the rubber plate, the upper and lower cover plates, and the embedded antenna, preventing deviations in the simulation results caused by loosening or displacement of the rubber plate during vibration testing. This guarantees the stability of energy transfer on the vibration table and the accuracy of the test results.

[0023] Optionally: In step eight, if the acceleration response does not meet the test requirements, replace the rubber sheet with one of different thicknesses and repeat steps four through seven until the acceleration response meets the test requirements.

[0024] This setup allows for flexible adjustment of the compression ratio of the rubber plate based on actual test feedback, precisely matching the actual flexible support boundary and dynamic environment of the embedded antenna within the antenna aperture. This effectively corrects test simulation deviations, ensuring that the dynamic boundary conditions of the vibration test are highly consistent with actual working conditions. It significantly improves the accuracy and reliability of the embedded antenna vibration test results, ensuring that the assessment of the antenna's shock resistance and stress response characteristics is more in line with actual usage scenarios.

[0025] In summary, the closed flexible vibration fixture and its vibration testing method disclosed in this invention have the beneficial effects of accurately simulating the real working environment of embedded antennas, adapting to tests of irregularly shaped parts, having a stable structure, ensuring accurate energy transmission, directly monitoring the response, adapting to multiple working conditions, and improving the accuracy of the test. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a closed flexible vibration clamp according to an embodiment of the present invention; Figure 2 This is an exploded view of a closed flexible vibration clamp according to an embodiment of the present invention.

[0028] Icons: 1-Base plate, 2-Reinforcing plate, 3-Side plate, 4-Mounting plate, 5-Top cover plate, 6-Lower cover plate, 7-Rubber plate, 8-Adapter block, 9-Fixing hole, 10-Buried antenna, 11-Upper rubber plate, 12-Lower rubber plate, 13-First rectangular slot, 14-Second rectangular slot, 15-Screw through hole, 16-Second threaded hole, 17-Bolt and nut, 18-Counterhead hole, 20-First threaded hole. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] Example See Figure 1 and Figure 2 This embodiment proposes a closed flexible vibration clamp, including a base plate 1, a reinforcing plate 2, a side plate 3, a mounting plate 4, an upper cover plate 5, a lower cover plate 6, a rubber plate 7, and a transition block 8; The mounting plate 4 is mechanically connected to the side plates 3 on both sides as a whole and then screwed onto the base plate 1. The reinforcing plate 2 is installed on the base plate 1 and fixed to the side plates 3. The base plate 1 has several fixing holes 9 for fixing to the vibration test bench. An embedded antenna 10 is installed inside the mounting plate 4. The rubber plate 7 includes an upper rubber plate 11 and a lower rubber plate 12. The upper rubber plate 11 and the lower rubber plate 12 are respectively laid on the upper and lower surfaces of the embedded antenna 10 to simulate the flexible material inside the antenna aperture. The upper cover plate 5 is attached to the upper rubber plate 11, the lower cover plate 6 is attached to the lower rubber plate 12, the two sides of the upper cover plate 5 and the lower cover plate 6 are locked to the side plate 3, the upper cover plate 5 and the lower cover plate 6 are locked to the mating surface of the mounting plate 4, and the ends of the upper cover plate 5 and the lower cover plate 6 are locked to each other to form a closed cavity. The upper surface of the upper cover plate 5 has a first rectangular groove 13, and the upper rubber plate 11 has a second rectangular groove 14 at the same position as the first rectangular groove 13. The adapter block 8 is placed in the first rectangular groove 13 and the second rectangular groove 14, and the adapter block 8 is bonded to the upper surface of the embedded antenna 10. The remaining surface of the adapter block 8 is bonded to the acceleration sensor (not shown in the figure).

[0032] This embodiment discloses a closed flexible vibration fixture. It utilizes a base plate 1, reinforcing plate 2, side plate 3, and mounting plate 4 to construct a stable fixture base. A rubber plate 7, which conforms to the upper and lower surfaces of the embedded antenna 10, simulates the flexible support boundary within the antenna aperture. Simultaneously, a closed cavity is formed between the multi-position locking upper cover plate 5, lower cover plate 6, and the base. This ensures that the vibration table energy is transmitted to the embedded antenna 10 specimen without distortion and accurately replicates the dynamic boundary conditions of the embedded antenna 10 during actual operation. Furthermore, because the upper cover plate 5 and upper rubber plate 11 have corresponding first rectangular grooves 13 and second rectangular grooves 14, and an adapter block 8 bonded to the embedded antenna 10 is built into them, the antenna can be directly monitored via an acceleration sensor on the adapter block 8. The acceleration response enables precise detection of the vibration test process, and the rubber plate 7 can be flexibly replaced with different thicknesses to adapt to the different installation environment simulation requirements of the embedded antenna 10. The overall structural design takes into account the authenticity, stability and adaptability of the test, effectively solving the technical problems that existing fixtures cannot adapt to irregular embedded antennas 10 and cannot simulate their real support stiffness and dynamic boundary conditions. This greatly improves the accuracy and reliability of the vibration test results of the embedded antenna 10, thus enabling a closed flexible vibration fixture to accurately simulate the real working environment of the embedded antenna 10, adapt to irregular part tests, have a stable structure, preserve energy transmission, directly monitor the response and adapt to multiple working conditions, and improve the accuracy of the test.

[0033] See Figure 1 and Figure 2The mounting plate 4 is mechanically connected to the side plates 3 on both sides by screws. There are four reinforcing plates 2, which are installed on the base plate 1 and the side plates 3 on both sides by screws. This not only enables the rapid and accurate assembly of each component, but also greatly improves the overall rigidity and structural stability of the fixture base through the arrangement of reinforcing plates 2 in multiple positions. At the same time, the screw connection method facilitates subsequent disassembly and maintenance, and is suitable for the vibration test requirements of the embedded antenna 10.

[0034] The base plate 1, side plate 3, reinforcing plate 2 and mounting plate 4 are fixedly connected by welding. This can form a stable integrated structure for the core structural components of the fixture base, which greatly improves the overall rigidity and structural strength of the base, effectively avoids relative displacement between the components during vibration testing, ensures that the energy of the vibration table can be transmitted to the embedded antenna 10 specimen without distortion, and improves the structural stability and service life of the fixture under vibration conditions.

[0035] See Figure 1 and Figure 2 The upper cover plate 5 and the lower cover plate 6 have first threaded holes 20 at the surface reinforcing ribs, and the upper cover plate 5 and the lower cover plate 6 have several second threaded holes 16 on the mating surfaces with the mounting plate 4. The upper cover plate 5 and the lower cover plate 6 have screw through holes 15 at their ends. The upper cover plate 5, lower cover plate 6, and side plate 3 are connected by screws. The upper cover plate 5, lower cover plate 6, and mounting plate 4 are also connected by screws. The screw holes 15 at the ends of the upper cover plate 5 and lower cover plate 6 are connected by bolts and nuts 17. In this way, the screws are used to lock the connection with the side plate 3 and mounting plate 4 respectively. The bolts and nuts 17 are used to lock the screw holes 15 at the ends of the upper cover plate 5 and lower cover plate 6. The screws are used to connect the first threaded holes 20 at the surface reinforcing ribs of the upper cover plate 5 and lower cover plate 6 to the side plate 3. The multi-position and multi-mode locking structure design can accurately ensure that the upper cover plate 5 and lower cover plate 6 and the rubber plate 7 reach the preset compression amount. At the same time, the upper cover plate 5 and lower cover plate 6 and the fixture base form a stable rigid closed cavity, which effectively avoids loosening or relative displacement of the connection parts during the vibration test. This ensures that the energy of the vibration table is transmitted to the embedded antenna 10 specimen without distortion, and improves the overall structural stability of the fixture and the accuracy of the vibration test.

[0036] Both the upper rubber plate 11 and the lower rubber plate 12 are silicone rubber plates, and the upper rubber plate 11 and the lower rubber plate 12 have different thicknesses. The upper rubber plate 11 and the lower rubber plate 12 are made of silicone rubber, and their flexibility can accurately simulate the flexible support boundaries such as honeycomb and foam that the embedded antenna 10 actually contacts within the antenna aperture, thus restoring the real dynamic boundary conditions. At the same time, by setting silicone rubber plates of different thicknesses, the compression ratio can be flexibly adjusted to match the different installation environment simulation requirements of the embedded antenna 10, adapt to various vibration test conditions, and improve the accuracy and adaptability of the test results.

[0037] See Figure 1 and Figure 2 The upper cover plate 5, lower cover plate 6, side plate 3, reinforcing plate 2, bottom plate 1, and mounting plate 4 are all made of aluminum alloy or high specific stiffness metal materials. This ensures that each structural component of the fixture has excellent rigidity and strength, effectively preventing deformation and resonance of the fixture during vibration testing, and ensuring that the energy of the vibration table is transmitted to the embedded antenna 10 without distortion. It also takes into account the lightweight requirements of the fixture and reduces the load pressure on the vibration test table. At the same time, this type of material is compatible with various connection methods such as welding and screwing, ensuring the overall assembly stability and structural reliability of the fixture.

[0038] The mounting plate 4 has several countersunk holes 18. The embedded antenna 10 is fixed to the mounting plate 4 by screws that engage with the countersunk holes 18. The countersunk structure allows the screw head to sink into the surface of the mounting plate 4, making the screw more aesthetically pleasing on the surface of the mounting plate 4, ensuring the depth of screw thread insertion, improving the stability of the embedded antenna 10 installation, and ensuring the flatness of the embedded antenna 10 and the mounting plate 4. At the same time, the engagement of the screws with the countersunk holes 18 can achieve a stable fixation of the embedded antenna 10, preventing the antenna from loosening or shifting during the vibration test, and ensuring the stability of the test process and the accuracy of the test results.

[0039] See Figure 1 and Figure 2 In this embodiment, during assembly, the mounting plate 4 is first mechanically connected to the two side plates 3 with screws to form a whole. Then, the whole is aligned with the positioning groove on the base plate 1 and screwed in. Subsequently, the four reinforcing plates 2 are installed on the base plate 1 with screws and attached to the side plates 3 and mounting plate 4. After screwing, the connection parts of the base plate 1, side plates 3, reinforcing plates 2 and mounting plate 4 are welded and fixed to form a stable clamp base. After the base is formed, the embedded antenna 10 is locked and fixed by screws through the countersunk holes 18 on the mounting plate 4. Then, rubber plates 7 are laid on the upper and lower surfaces of the embedded antenna 10 respectively, so that the rubber plates 7 are tightly attached to the antenna surface. After that, the upper cover plate 5 and the lower cover plate 6 are separated. Do not attach the upper rubber plate 11 and the lower rubber plate 12. Secure the sides of the upper cover plate 5 and the lower cover plate 6 to the side plate 3 with screws. Secure the surface of the mounting plate 4 to the mounting plate 4. Then, secure the ends of the upper cover plate 5 and the lower cover plate 6 with bolts and nuts 17 to achieve the preset compression amount of the rubber plate 7 and form a rigid closed cavity. Finally, place the adapter block 8 into the first rectangular groove 13 and the second rectangular groove 14 corresponding to the upper cover plate 5 and the upper rubber plate 11, so that the adapter block 8 is bonded to the upper surface of the embedded antenna 10. This completes the overall assembly of the closed flexible vibration fixture. After assembly, an acceleration sensor can be bonded to the surface of the adapter block 8 to prepare for vibration testing.

[0040] See Figure 1 and Figure 2In this embodiment, to improve the overall natural frequency of the fixture, while taking into account lightweight design and ensuring structural rigidity, the overall height of the flexible fixture is designed to be less than 300mm; the thickness of the mounting plate 4 is less than 15mm, and multiple weight-reduction cavities are designed on the plate body, which effectively reduces the overall weight of the fixture while meeting the installation and fixing strength of the embedded antenna 10, and reduces the load pressure on the vibration test bench; the thickness of the side plate 3 and the reinforcing plate 2 are both set to 20mm, thereby specifically improving the overall structural rigidity of the fixture in the vertical direction, avoiding resonance and deformation problems of the fixture during vibration test, and ensuring that the excitation energy of the vibration table is stably and undistortedly transmitted to the embedded antenna 10 specimen.

[0041] See Figure 1 and Figure 2 In one embodiment of this invention, a vibration testing method for a closed flexible vibration fixture is also provided, comprising the following steps: Step 1: Screw the mounting plate 4 onto the side plates 3 on both sides. Then, align the mounting plate 4 and the side plates 3 together with the positioning groove on the base plate 1 and fix them with screws. Next, install the reinforcing plates 2 on both sides and weld the reinforcing plates 2 to the base plate 1 and the side plates 3 to form the entire fixture base. Step 2: Fix the base plate 1 of the fixture base to the vibration test bench using screws; Step 3: Fix the embedded antenna 10 to the mounting plate 4 with screws; Step 4: Apply rubber sheet 11 and lower rubber sheet 12 to the upper and lower surfaces of the embedded antenna 10, respectively. Step 5: Screw the upper cover plate 5 and the lower cover plate 6 onto the side plates 3 and the mounting plate 4 on both sides respectively. Then, use bolts and nuts 17 to lock the end joints of the upper cover plate 5 and the lower cover plate 6 to form a closed cavity. Step 6: Pass the adapter block 8 through the first rectangular groove 13 and the second rectangular groove 14 of the upper cover plate 5 and the upper rubber plate 11, and attach it to the upper surface of the embedded antenna 10. Then, attach the accelerometer to the remaining surface of the adapter block 8. Step 7: Turn on the vibration testing equipment and conduct a vibration test on the embedded antenna 10; Step 8: Collect the end acceleration response of the embedded antenna 10 using an accelerometer, and adjust the thickness of the rubber plate 7 based on the acceleration response feedback.

[0042] See Figure 1 and Figure 2In step five, when the screws are tightened, the upper cover plate 5 and the upper rubber plate 11, and the lower cover plate 6 and the lower rubber plate 12 are compressed to a preset amount. This allows for precise control of the deformation of the rubber plate 7, ensuring that it fits the embedded antenna 10 and simulates the true stiffness and dynamic boundary conditions of the flexible support within the antenna aperture. At the same time, the preset compression amount allows the rubber plate 7 to form a stable contact fit with the upper cover plate 5, the lower cover plate 6, and the embedded antenna 10, avoiding deviations in the simulation effect caused by loosening or displacement of the rubber plate 7 during the vibration test, and ensuring the stability of energy transfer on the vibration table and the accuracy of the test results.

[0043] See Figure 1 and Figure 2 In step eight, if the acceleration response does not meet the test requirements, replace the rubber plate 7 with one of different thicknesses and repeat steps four to seven until the acceleration response meets the test requirements. The compression ratio of the rubber plate 7 can be flexibly adjusted according to the actual test feedback to accurately match the real flexible support boundary and dynamic environment of the embedded antenna 10 within the antenna aperture. This effectively corrects the test simulation deviation, ensures that the dynamic boundary conditions of the vibration test are highly consistent with the actual working conditions, and significantly improves the accuracy and reliability of the vibration test results of the embedded antenna 10. This ensures that the assessment of the antenna's shock resistance and stress response characteristics is more in line with the actual use scenario.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A closed-type flexible vibration clamp, characterized in that: It includes a base plate (1), a reinforcing plate (2), a side plate (3), a mounting plate (4), an upper cover plate (5), a lower cover plate (6), a rubber plate (7), and a transition block (8); The mounting plate (4) is mechanically connected to the side plates (3) on both sides as a whole and then screwed onto the base plate (1). The reinforcing plate (2) is installed on the base plate (1) and fixed to the side plates (3). The base plate (1) has several fixing holes (9) for fixing to the vibration test bench. An embedded antenna (10) is installed inside the mounting plate (4). The rubber plate (7) includes an upper rubber plate (11) and a lower rubber plate (12). The upper rubber plate (11) and the lower rubber plate (12) are respectively laid on the upper and lower surfaces of the embedded antenna (10). The upper cover plate (5) is attached to the upper rubber plate (11), the lower cover plate (6) is attached to the lower rubber plate (12), the two sides of the upper cover plate (5) and the lower cover plate (6) are locked to the side plate (3), the contact surfaces of the upper cover plate (5) and the lower cover plate (6) are locked to the mounting plate (4), and the ends of the upper cover plate (5) and the lower cover plate (6) are locked to each other to form a closed cavity; The upper surface of the upper cover plate (5) is provided with a first rectangular groove (13), and the upper rubber plate (11) is provided with a second rectangular groove (14) corresponding to the first rectangular groove (13). The adapter block (8) is placed in the first rectangular groove (13) and the second rectangular groove (14), and the adapter block (8) is bonded to the upper surface of the embedded antenna (10). The remaining surface of the adapter block (8) is bonded with an acceleration sensor.

2. The enclosed flexible vibration clamp according to claim 1, characterized in that: The mounting plate (4) is mechanically connected to the side plates (3) on both sides by screws. There are four reinforcing plates (2), and the reinforcing plates (2) are installed on the base plate (1) and the side plates (3) on both sides by screws.

3. The enclosed flexible vibration clamp according to claim 1, characterized in that: The base plate (1), the side plate (3), the reinforcing plate (2) and the mounting plate (4) are fixedly connected by welding.

4. The enclosed flexible vibration clamp according to claim 1, characterized in that: The upper cover plate (5) and the lower cover plate (6) have first threaded holes (20) at the surface reinforcing ribs. The upper cover plate (5) and the lower cover plate (6) have several second threaded holes (16) on their mating surfaces with the mounting plate (4). The upper cover plate (5) and the lower cover plate (6) have screw through holes (15) at their ends. The upper cover plate (5), the lower cover plate (6) and the side plate (3) are connected by screws, the upper cover plate (5), the lower cover plate (6) and the mounting plate (4) are connected by screws, and the screw holes (15) at the ends of the upper cover plate (5) and the lower cover plate (6) are connected by bolts and nuts (17).

5. A closed flexible vibration clamp according to claim 1, characterized in that: Both the upper rubber plate (11) and the lower rubber plate (12) are silicone rubber plates, and the upper rubber plate (11) and the lower rubber plate (12) have different thicknesses.

6. The enclosed flexible vibration clamp according to claim 1, characterized in that: The upper cover plate (5), the lower cover plate (6), the side plate (3), the reinforcing plate (2), the bottom plate (1), and the mounting plate (4) are all made of aluminum alloy or high specific stiffness metal materials.

7. A closed flexible vibration clamp according to claim 1, characterized in that: The mounting plate (4) has several countersunk holes (18), and the embedded antenna (10) is fixed to the mounting plate (4) by screws engaging with the countersunk holes (18).

8. A vibration testing method using a closed flexible vibration fixture according to any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: Screw the mounting plate (4) onto the side plates (3) on both sides. Then align the mounting plate (4) and the side plates (3) with the positioning groove on the base plate (1) and fix them with screws. Then install the reinforcing plates (2) on both sides and weld the reinforcing plates (2) to the base plate (1) and the side plates (3) to form the fixture base as a whole. Step 2: Fix the base plate (1) of the fixture base to the vibration test bench with screws; Step 3: Fix the embedded antenna (10) to the mounting plate (4) with screws; Step 4: Apply rubber sheet (11) and lower rubber sheet (12) to the upper and lower surfaces of the embedded antenna (10), respectively. Step 5: Screw the upper cover plate (5) and the lower cover plate (6) onto the side plates (3) and mounting plate (4) on both sides respectively. Then, use bolts and nuts (17) to lock the end joints of the upper cover plate (5) and the lower cover plate (6) to form a closed cavity. Step 6: Pass the adapter block (8) through the first rectangular groove (13) and the second rectangular groove (14) of the upper cover plate (5) and the upper rubber plate (11), and attach it to the upper surface of the embedded antenna (10), and attach the accelerometer to the remaining surface of the adapter block (8). Step 7: Turn on the vibration test equipment and conduct a vibration test on the embedded antenna (10); Step 8: Acquire the end acceleration response of the embedded antenna (10) using an accelerometer, and adjust the thickness of the rubber plate (7) based on the acceleration response feedback.

9. The vibration testing method for a closed flexible vibration fixture according to claim 8, characterized in that: In step five, when the screws are tightened, the upper cover plate (5) and the upper rubber plate (11), and the lower cover plate (6) and the lower rubber plate (12) reach the preset compression amount.

10. The vibration testing method for a closed flexible vibration fixture according to claim 8, characterized in that: In step eight, if the acceleration response does not meet the test requirements, replace the rubber sheet with one of different thicknesses (7) and repeat steps four to seven until the acceleration response meets the test requirements.

Images