Frequency modulation type impact response spectrum testing device

Abstract

A frequency modulation type impact response spectrum testing device comprises an impact component, a boundary adjusting component and a response plate. Wherein the impact part is used for bearing impact from an excitation source, the boundary adjusting part is used for adjusting the relative installation relation between the response plate and the impact part, a waveform adjuster can be arranged on the edge of the impact part and used for adjusting the installation boundary rigidity of the test device, and the waveform adjuster can be designed on the impact part to control waveforms generated during impact. The response plate is used for installing a test piece and generating response spectrum waveforms meeting requirements. In the device, an impact part reinforcing beam, the position of a boundary adjusting part, a response plate, a waveform adjuster and the like can be replaced or adjusted, and then the key inherent frequency of a response spectrum is adjusted. The inflection point frequency of the response spectrum can be adjusted from 500Hz to 1500Hz, and the rising slope can be adjusted from 6dB / oct to 9dB / oct, so that the defect of high difficulty in adjusting the inherent characteristics of the conventional impact response test device is overcome, the impact response test device can adapt to test pieces with different sizes, and the test coverage range of the traditional impact response spectrum test machine is expanded.

Description

Technical Field

[0001] The invention belongs to the field of spacecraft dynamics tests, and in particular relates to a frequency modulation type shock response spectrum test device. Background Art

[0002] Aerospace products will inevitably experience explosive shock environments during the launch phase. The changes in instantaneous acceleration caused by the explosive shock environment will have a significant impact on the performance of aerospace products and even damage them. Therefore, it is necessary to simulate the explosive shock environment on the ground to ensure the reliability of aerospace equipment in the explosive shock environment. With the development of large-scale and diversified spacecraft, the differences in the explosive shock environment are becoming greater and greater, but the frequency response range of existing experimental equipment is too small to meet the diverse experimental needs of aerospace engineering. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the frequency response range of existing experimental equipment is too small and thus cannot meet the diversified experimental needs of aerospace engineering.

[0004] The purpose of the present invention is to adopt the following technical solutions to achieve:

[0005] A frequency modulation type shock response spectrum test device, the device comprising: an impact component for bearing the impact of an excitation source, a boundary adjustment component fixed to the impact component on one side and adjustable in position, a response plate fixed to the other side of the boundary adjustment component, a waveform regulator I fixed to the edges of both sides of the impact component, and a waveform regulator II fixed to the impacted part of the impact component;

[0006] The impact component is fixed to the impact response spectrum test equipment via the waveform regulator I;

[0007] The response spectrum test device realizes frequency spectrum adjustment of the impact response spectrum by replacing different waveform regulators I and / or waveform regulators II.

[0008] Preferably, the impact component comprises a detachable reinforcement beam.

[0009] Preferably, the boundary adjustment component is made of steel.

[0010] Preferably, the response plate is made of a hard aluminum alloy.

[0011] Preferably, the response spectrum test device includes response plates of multiple different materials and / or different specifications.

[0012] Preferably, the response spectrum test device includes waveform regulators I of multiple different materials and / or different specifications.

[0013] Preferably, the response spectrum test device includes waveform regulators II of various materials and / or specifications.

[0014] Preferably, the response spectrum test device includes impact components of multiple different materials and / or different specifications.

[0015] Preferably, the materials of the waveform regulator I and the waveform regulator II respectively include one or more of felt, rubber, cardboard, resin elastomer, and layered composite material; the layered composite material contains one or more of the felt, rubber, cardboard, and resin elastomer.

[0016] Preferably, the response plate, the boundary adjustment component and the impact component are fixed by bolt connection.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention discloses a frequency modulation type shock response spectrum test device, the device comprises: an impact component for bearing the impact of an excitation source, a boundary adjustment component fixed to the impact component on one side and adjustable in position, a response plate fixed to the other side of the boundary adjustment component, a waveform regulator I fixed to the edges of both sides of the impact component, and a waveform regulator II fixed to the impacted part of the impact component; the impact component is fixed to the shock response spectrum test device via the waveform regulator I; the response spectrum test device realizes the frequency spectrum adjustment of the shock response spectrum by replacing different waveform regulators I and / or waveform regulators II. The present invention realizes the adjustment of the fixed stiffness by setting a replaceable waveform regulator I at the fixed position of the impact component, thereby realizing the adjustment of the shock response spectrum; by setting a waveform regulator II at the impacted part of the impact component, and by replacing different waveform regulators II, realizing the adjustment of the impact time of the impact component, thereby realizing the control of the pulse width of the impact response; thereby solving the problem that the frequency response range of the existing experimental equipment is too small and thus cannot meet the diversified experimental needs of aerospace engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a frequency modulation type shock response spectrum test device of the present invention;

[0020] Figure 2 for Figure 1 A top view of the impact component;

[0021] Figure 3 for Figure 1 A cross-sectional view of the impact component;

[0022] Figure 4 for Figure 1 Top view of the middle response plate;

[0023] Figure 5 for Figure 1 A top view of the mid-boundary adjustment component;

[0024] Figure 6 for Figure 1 a cross-sectional view of a mid-boundary adjustment component;

[0025] Figure 7 is a stereoscopic view of the waveform generator I;

[0026] Figure 8 is a stereoscopic view of the waveform generator II;

[0027] Fig. 9 This is the time domain-impact response spectrum of the 1500mm response plate;

[0028] Fig.10 This is the time domain-impact response spectrum of the 600mm response plate;

[0029] Wherein: 1. impact component, 2. response plate, 3. boundary adjustment component, 4. waveform regulator II, 5. waveform regulator I, 101. impacted part, 102. reinforcing rib, 103. bolt hole, 201. fixing hole, 301. installation hole. DETAILED DESCRIPTION

[0030] The frequency modulation type shock response spectrum test device of the present invention is described in detail below with reference to the accompanying drawings. The specific implementation is only for the purpose of illustration and is not intended to limit the protection scope of the present invention.

[0031] In order to solve the problem that the frequency response range of existing experimental equipment is too small and thus cannot meet the diversified experimental needs of aerospace engineering, the present invention provides a frequency modulation shock response spectrum test device, which is used for upgrading and renovating existing shock response spectrum test equipment or manufacturing new shock response spectrum test equipment. The key frequency of the frequency modulation shock response spectrum test device can be adjusted in a wide range, and the inflection point frequency that can be achieved can be adjusted from 500Hz to 1500Hz, and the rising slope can be adjusted from 6dB / oct to 9dB / oct, which can cover most aerospace test conditions and specifications.

[0032] The technical solution adopted by the present invention is:

[0033] like Figure 1-3As shown, the frequency modulation shock response spectrum test device includes: an impact component 1 for bearing the impact of an excitation source, a boundary adjustment component 3 fixed to the impact component 1 on one side and adjustable in position, a response plate 2 fixed to the other side of the boundary adjustment component 3, a waveform regulator I5 fixed to the edges of both sides of the impact component 1, and a waveform regulator II fixed to the impacted part 101 of the impact component 1; the impact component 1 is fixed to the shock response spectrum test equipment via the waveform regulator I5; the response spectrum test device achieves frequency spectrum adjustment of the shock response spectrum by replacing different waveform regulators I5 and / or waveform regulators II4.

[0034] The impact component 1 includes a main body structure and a reinforcing beam. The impact component 1 is made of high-strength steel, and the impacted part 101 is reinforced by a reinforcing beam 102; at the same time, the impact component 1 also includes a plurality of bolt holes 103 for connection and fixation; further, the impact component 1 also includes a detachable reinforcing beam (the specific structure is not shown in the figure), and the stiffness of the impact component 1 is changed by replacing the detachable reinforcing beams of different specifications, thereby changing the impact response spectrum characteristics. According to the frequency characteristics of the response spectrum, a series of mounting holes are designed on the main body structure of the impact device to adjust the installation position of the reinforcing beam. Different positions will affect the stiffness of the structure, causing the natural frequency of the structure to change, thereby achieving a wide range of impact response spectrum adjustment.

[0035] like Figure 4 As shown, the response plate 2 is a plate-shaped part and includes a plurality of fixing holes 201 for connecting and fixing the boundary adjustment component 3. The response plate 2 can be designed and replaced according to test requirements.

[0036] like Figure 5 and Figure 6 As shown, the boundary adjustment component 3 is a long strip part, including a plurality of mounting holes 301 for connection and installation, and the boundary adjustment component 3 is connected to the impact component 1 and the response plate 2 by bolts. The number and installation position of the boundary adjustment component 3 can be adjusted to achieve the change of the stiffness of a frequency modulation type shock response spectrum test device, thereby changing the shock response spectrum characteristics of the frequency modulation type shock response spectrum test device, and achieving a wide range of shock response spectrum adjustment.

[0037] According to the principle of impact response spectrum test, in order to achieve a certain test specification and make a certain order natural frequency of the response device near the inflection point, the finite element method can be used to design the natural frequency of the complex response device. In this example, three specifications of response plates are designed, namely 1500mm×1500mm×22mm, 1000mm×1000mm×20mm, and 600mm×600mm×30mm. At the same time, both the waveform regulator I and the waveform regulator II can be adjusted.

[0038] The present invention divides the response device into an impact component, a boundary adjustment component and a response plate. The impact component is designed with high-strength steel and has small deformation and good stability under external excitation impact (pneumatic, pendulum or other forms of impact excitation). The response plate does not directly participate in the impact process, thereby solving the problem of deformation of traditional aluminum alloy plates after impact.

[0039] The response plate in the present invention can be replaced according to test requirements and can meet the installation requirements of test pieces of different sizes.

[0040] In the present invention, through the combination of disassembly of the impact component reinforcement beam, replacement of the response plate, adjustment of the position of the boundary adjustment component, replacement of the waveform regulator I / II, etc., a wide range adjustment of the inflection point frequency range of 500Hz-1500Hz and the rising slope of 6dB / oct-9dB / oct is achieved, which can meet the requirements of most aerospace test conditions.

[0041] This embodiment uses a conventional pneumatic impact table for illustration. The device can also be used for other similar impact tables, such as a pendulum impact table.

[0042] In this embodiment, the response plate 4 is designed in three sizes, and the size specifications (length × width × height) are: 1500mm × 1500mm × 22mm, 1000mm × 1000mm × 20mm, 600mm × 600mm × 30mm. The size specifications of the impact device 2 are (length × width × height) 1000mm × 1200 × 55mm, including a detachable reinforcement beam, such as Figure 2 . There is one size specification for the border adjustment block, such as Figure 5 There are two sizes of waveform generator I, namely (length × width × height): 200mm × 500mm × 10mm, 1000mm × 500mm × 10mm, such as Figure 7 Waveform generator II has one size specification, which are (length × width × height): 200mm × 500mm × 10mm, 1000mm × 500mm × 10mm, such as Figure 8 .

[0043] The frequency modulation shock response spectrum test device is installed on the traditional pneumatic shock table through the impact component 2. The installation method can be bolted or tightened (air pressure or oil pressure). In order to facilitate the replacement and adjustment of the tightening pressure, this example uses oil pressure tightening on the traditional shock table to install the response device on the shock table, tighten the impact component 2, and install the response plate 2 on the impact component 1 through the boundary adjustment component 3 to achieve the upgrade and transformation of the existing equipment.

[0044] The aluminum alloy response plate 4 is mounted on the impact device 2 through a boundary adjustment block.

[0045] The waveform generator I1 is pressed between the impact table and the collision device 2 by the oil pressure device. The 200mm specification is pressed between the oil cylinder and the impact plate 2, and the 1000mm specification is pressed between the collision device 2 and the impact head. In this example, a crystal pad is used as the material of the waveform generator I.

[0046] Waveform generator II 5 is placed and pasted on the impact head, and the impact head drives the collision device. In this example, rubber is used as the material of waveform generator I.

[0047] During operation, the waveform regulator I 5 is pressed tightly between the pneumatic impact platform and the impact component 2 through the oil pressure device, and the waveform regulator II4 is fixed to the impacted part 101 of the impact component 1 (it can also be placed on the impact head), and the impact head impacts the waveform generator II4 and the impact component 1.

[0048] The response spectrum test device includes response panels of various materials and / or specifications.

[0049] The response spectrum test device includes waveform regulators I of various materials and / or specifications.

[0050] The response spectrum test device includes waveform regulators II of various materials and / or specifications.

[0051] The response spectrum test device includes impact components of various materials and / or specifications.

[0052] The materials of the waveform regulator I and the waveform regulator II respectively include one or more of felt, rubber, cardboard, resin elastomer, and layered composite material; the layered composite material contains one or more of the felt, rubber, cardboard, and resin elastomer.

[0053] By replacing different impact components 1, response plates 2, waveform regulators I, waveform regulators II, and changing the installation position of the boundary adjustment component 3, a wide range of adjustment of the impact frequency response characteristics of the response spectrum test device can be achieved in different combinations of the above components. The response spectrum test device of the present invention can achieve the adjustment of the inflection point from 500Hz to 1500Hz and the rising slope from 6dB / oct to 9dB / oct. Fig. 9 To achieve the test specification of 6dB / oct, 500Hz using a 1500mm response board, Fig.10 For the test, a 600mm response board was used to achieve the test specification of 9dB / oct, 1500Hz.

[0054] In this embodiment, if the impact response spectrum cannot reach the predetermined inflection point or slope of the response spectrum, the platform waveform regulator I 5, waveform regulator II 4, the parameters of the reinforcement beam of the impact component 2, the boundary adjustment component 3, and the response plate 4 are adjusted according to the actual situation, and the above implementation process is repeated to achieve the predetermined inflection point or slope of the response spectrum. If the inflection frequency is higher than expected, the stiffness of the test device is reduced, such as reducing the number of boundary adjustment blocks, replacing a larger response plate, disassembling the collision device reinforcement beam, and increasing the thickness of the waveform generators I and II, which can reduce the inflection frequency and the rising slope.

[0055] The development principle of a large-load vertical impact response spectrum tester of the present invention is as follows: For an impact response spectrum test device, to achieve a certain characteristic test specification, a typical natural frequency is required at the inflection point frequency of the specification. The natural frequency is an inherent characteristic of the structure. When the structure is determined, the natural frequency is also determined accordingly. In this embodiment, the response device is divided into three typical parts. Through different combinations, the stiffness of the test device is changed to adjust the natural frequency of the structure and the impact pulse width, the natural frequency of the structure is changed, and the corresponding test conditions are met.

[0056] The test device consists of an impact device, a boundary adjustment block, a response plate, and waveform generators I and II. According to the relationship between the natural frequency and the structural stiffness K and mass M: It can be seen that when the structural mass is constant, the structural natural frequency is related to the structural stiffness. By changing the impact device stiffness, the boundary adjustment block installation form, the response plate specifications, and waveform generators I and II, the stiffness of the test device can be adjusted to achieve changes in the structural natural frequency.

[0057] The impact device includes a main body structure and a reinforcement beam. The impact device is made of high-strength steel and adopts a topological optimization design method to strengthen the key impact points to ensure sufficient strength and rigidity during the collision process, while reducing the weight of the impact device to achieve the purpose of repeated impact and reuse.

[0058] The detachable design structure of the reinforcement beam makes the impact device stiffness adjustable, which affects the change of the natural frequency of the structure. According to the frequency characteristics of the response spectrum, a series of mounting holes are designed on the main structure of the impact device to adjust the installation position of the reinforcement beam. Different positions will affect the stiffness of the structure and change the natural frequency of the structure.

[0059] The boundary adjustment block is connected to the impact device and the response plate by bolts. The number and installation position of the boundary adjustment blocks can be adjusted to change the stiffness of the response plate installation boundary. When three boundary adjustment blocks are used at the same time with a spacing of 600mm, the stiffness of the response device is the largest and the natural frequency of the structure is the highest; when only one boundary adjustment block is used, the stiffness of the response device is the smallest and the natural frequency of the structure is the lowest. By adjusting the expansion and contraction of the plate, there is a certain response to low frequencies and less impact on high frequencies. The larger the plate, the smaller the impact on high frequencies.

[0060] The response plate can be designed according to the test requirements, such as different sizes, different materials, etc. In this example, three specifications of aluminum alloy response plates are designed: 1500mm response, 1000mm, and 600mm, to suit the installation of products of different sizes and weights. According to the design of this example, the natural frequency of the response spectrum is the largest when the 1000mm specification is used, followed by 600mm, and the natural frequency of 1500mm is the smallest.

[0061] Waveform generators I and II are adjustable. Waveform generator I mainly affects the installation stiffness of the installed device. Waveform generators I and II are designed with a series of structures with different stiffness, damping and size. Waveform generator I uses damping materials with different stiffness. For example, if materials with lower stiffness such as felt are used, the installation stiffness of the test device is reduced; if materials with higher stiffness such as hard rubber are used or not used, the installation stiffness of the test device is increased.

[0062] Waveform generator II mainly affects the pulse width and peak value of the external excitation during impact. Waveform generator I uses damping materials of different stiffness. If a material with lower stiffness such as felt is used, the impact time of the hammer head can be increased and the pulse frequency can be reduced. If a material with higher stiffness such as hard rubber is used or not used, the impact time of the hammer head can be reduced and the pulse frequency can be increased.

[0063] The present invention has the following beneficial effects:

[0064] The test device of the present invention is composed of an impact device, a boundary adjustment block, a response plate, and a waveform generator. The impact device is designed with high-strength steel and has a strong ability to withstand large-energy excitation impact (pneumatic, pendulum or other forms of impact excitation). The test device has small deformation, high stability, and good high-frequency response transmission effect. The response plate does not directly participate in the impact process, which solves the shortcomings of using traditional aluminum alloy response plates that are easily deformed after high-level impact and have poor reusability.

[0065] The response plate in the present invention is replaced according to the test requirements, and can meet the test installation requirements of products of different sizes.

[0066] Although the specific embodiments of the present invention have been described and illustrated in detail above, it should be noted that various changes and modifications may be made to the above embodiments without departing from the spirit of the present invention and the scope of the appended claims.

[0067] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention.

Claims

1. A frequency modulation shock response spectrum test device, characterized in that: The device comprises: an impact component for bearing the impact of an excitation source, a boundary adjustment component fixed to the impact component on one side and adjustable in position, a response plate fixed to the other side of the boundary adjustment component, a waveform regulator I fixed to the edges of both sides of the impact component, and a waveform regulator II fixed to the impacted portion of the impact component; The impact component is fixed to the impact response spectrum test equipment via the waveform regulator I; The response spectrum test device realizes frequency spectrum adjustment of the impact response spectrum by replacing different waveform regulators I and / or waveform regulators II.

2. A frequency modulation shock response spectrum test device as claimed in claim 1, characterized in that: The impact component includes a detachable reinforcement beam.

3. A frequency modulation shock response spectrum test device as claimed in claim 1, characterized in that: The boundary adjustment component is made of steel.

4. A frequency modulation shock response spectrum test device as claimed in claim 1, characterized in that: The response plate is made of hard aluminum alloy.

5. A frequency modulation shock response spectrum test device as claimed in claim 1, characterized in that: The device comprises response plates of various materials and / or specifications.

6. A frequency modulation shock response spectrum test device as claimed in claim 1, characterized in that: The device includes waveform regulators I of various materials and / or specifications.

7. A frequency modulation shock response spectrum test device as claimed in claim 1, characterized in that: The device includes a plurality of waveform regulators II of different materials and / or different specifications.

8. A frequency modulation shock response spectrum test device as claimed in claim 1, characterized in that: The response spectrum test device includes impact components of various materials and / or specifications.

9. A frequency modulation shock response spectrum test device as claimed in claim 1, characterized in that: The materials of the waveform regulator I and the waveform regulator II respectively include one or more of felt, rubber, cardboard, resin elastomer, and layered composite material; the layered composite material contains one or more of the felt, rubber, cardboard, and resin elastomer.

10. A frequency modulation shock response spectrum test device as claimed in claim 1, characterized in that: The response plate, the boundary adjustment component and the impact component are connected and fixed by bolts.

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