Explosive impact simulation system and method

Abstract

The present application relates to a pyrotechnic impact simulation system and method, wherein the system includes: a supporting device; a bearing device for bearing a test piece; an impact device for impacting the bearing device so that the bearing device and the test piece generate a vibration response; a laser generating device for emitting a laser to the impact device to simulate a real pyrotechnic impact environment; a data measuring device for measuring the vibration response data generated by the bearing device and / or the test piece after being impacted; and a collection system for collecting vibration response data. Therefore, the present application provides a new type of pyrotechnic impact simulation device with laser as an excitation source that can adjust the target impact response, which can well simulate the real pyrotechnic impact environment, and improves the problem that the target impact response is difficult to control in other related devices and technologies that use laser impact to simulate the pyrotechnic impact environment, which is not conducive to the promotion of laser excitation simulation methods.

Description

Technical Field

[0001] The present application relates to the field of pyrotechnic impact technology, and in particular to a pyrotechnic impact simulation system and method. Background Art

[0002] In spacecraft, pyrotechnic separation devices such as separation nuts, explosive nuts, and unlocking bolts have the characteristics of high reliability, easy use, and mature technology. They are widely used in key tasks such as multi-stage rocket separation, component deployment, and component release. Under the conditions of pyrotechnic explosion impact, spacecraft components will produce high-frequency, high-level, and extremely short-duration transient responses, which will cause great safety hazards to precision electronic components in spacecraft (for example, high-precision cameras, chips, and guidance heads), and seriously threaten the successful implementation of space flight missions. In order to improve the success rate of space flight missions, it is necessary to simulate the real pyrotechnic impact environment in the ground environment to test the pyrotechnic impact resistance of spacecraft components.

[0003] In the related art, a laser-excited simulation method can be used to simulate real pyrotechnic impact.

[0004] However, in the related art, the target impact response generated by the device that uses laser shock to simulate the pyrotechnic impact environment is difficult to adjust, and cannot simulate the real pyrotechnic impact environment well, which is not conducive to the promotion of laser excitation simulation methods and urgently needs to be improved. Summary of the invention

[0005] The present application provides a pyrotechnic impact simulation system and method to improve the problems in the related art, such as the target impact response generated by the device using laser shock to simulate the pyrotechnic impact environment cannot be adaptively adjusted according to the different tested parts, cannot simulate the real pyrotechnic impact environment well, and is not conducive to the promotion of laser excitation simulation methods.

[0006] The first aspect of the present application provides a pyrotechnic impact simulation system, comprising: a supporting device; a bearing device, the bearing device being suspended from the supporting device, the bearing device being used to bear a test piece; an impact device, the impact device being arranged on a side of the bearing device facing away from the test piece, the impact device being used to impact the bearing device so as to generate a vibration response between the bearing device and the test piece; a laser generating device, being used to emit a laser to the impact device so that the impact device impacts the bearing device under the action of the laser to simulate a real pyrotechnic impact environment; a data measuring device, the data measuring device being connected to a side of the bearing device bearing the test piece, the data measuring device being used to measure vibration response data generated by the bearing device and / or the test piece after being impacted; and a collection system, the collection system being connected to the data measuring device, the collection system being used to collect the vibration response data.

[0007] Optionally, in one embodiment of the present application, the impact device includes: a cylinder, one end of which is connected to the supporting device; an impact piece, which is slidably connected to the cylinder; a constraint layer, which is fixedly arranged in the cylinder and located on the side of the impact piece facing the laser generating device; an absorption layer, which is arranged on the surface of the impact piece, the absorption layer is located between the impact piece and the constraint layer, and the absorption layer is in contact with the constraint layer; wherein the constraint layer is arranged to be transparent to the laser, so that the laser can pass through the constraint layer and be incident on the absorption layer; the surface material of the absorption layer melts, evaporates and forms plasma under the action of the laser, so that the plasma pushes the impact piece to slide in the cylinder under the constraint of the constraint layer, and the impact piece slides and impacts the supporting device under the push of the plasma.

[0008] Optionally, in one embodiment of the present application, the inner surface of the cylinder is coated with a lubricant to reduce energy loss caused by sliding of the impact member inside the cylinder and to increase the impact strength of the impact member on the bearing device.

[0009] Optionally, in one embodiment of the present application, it further includes: a buffer member, which is arranged at one end of the cylinder and fixedly arranged on the surface of the supporting device to adjust the impact duration and impact magnitude of the impact member on the supporting device.

[0010] Optionally, in an embodiment of the present application, there are multiple data measuring devices, which are arranged at different positions of the carrying device to measure the vibration response data at different positions of the carrying device.

[0011] Optionally, in one embodiment of the present application, it also includes: an adjustment device, which is connected to a side of the supporting device facing away from the laser generating device, wherein the adjustment device is installed on the test piece to adjust the vibration response generated on the test piece.

[0012] Optionally, in one embodiment of the present application, the adjustment device is retractable along its length direction to adjust the resonant frequency of the adjustment device.

[0013] Optionally, in one embodiment of the present application, the adjustment device includes: a plurality of resonance rods, the plurality of resonance rods are connected in sequence along the length direction, the diameters of the plurality of resonance rods decrease in sequence, and the resonance rods can be slidably connected in adjacent resonance rods to adjust the length of the adjustment device.

[0014] Optionally, in one embodiment of the present application, the data measuring device is installed on the adjustment device to measure the vibration response data of the tested piece.

[0015] The second aspect of the present application provides a pyrotechnic impact simulation method, comprising the following steps: adjusting the resonant frequency of the pyrotechnic impact simulation system so that the resonant frequency is the same as the inflection point frequency of the expected impact response spectrum; adjusting the pyrotechnic impact simulation system to adjust the impact duration of the impact device on the bearing device so that the adjustment device resonates to match the inflection point frequency; adjusting the output power of the laser generating device according to the high-frequency amplitude of the expected impact response spectrum; measuring and collecting the impact response spectrum of the test piece after being impacted; comparing the expected impact response spectrum with the impact response spectrum, wherein when the error between the expected impact response spectrum and the impact response spectrum meets predetermined requirements, the impact response spectrum is obtained to complete the pyrotechnic impact simulation test of the test piece.

[0016] Optionally, in an embodiment of the present application, the method further includes: when the error between the expected impact response spectrum and the impact response spectrum does not meet the predetermined requirement, repeating the above steps until the error meets the predetermined requirement.

[0017] Optionally, in one embodiment of the present application, the comparing the expected shock response spectrum with the shock response spectrum includes: calculating an average error coefficient between the expected shock response spectrum and the shock response spectrum based on expected acceleration response amplitudes of the expected shock response spectrum corresponding to each frequency within a frequency analysis range and the acceleration response amplitudes of the shock response spectrum; wherein the predetermined requirement includes: the average error coefficient is less than or equal to a preset threshold.

[0018] Optionally, in one embodiment of the present application, adjusting the resonant frequency of the pyrotechnic impact simulation system includes: adjusting the resonant frequency by adjusting the length of the adjustment device.

[0019] Optionally, in one embodiment of the present application, adjusting the pyrotechnic impact simulation system includes: adjusting the material and / or thickness of the buffer component to adjust the impact duration of the impact device on the support device.

[0020] The embodiment of the present application can use laser shock as the shock source, use the shock device to perform shock, simulate the real pyrotechnic shock environment, and collect the vibration response data generated after the shock. Therefore, the problem that the target shock response generated by the device using laser shock to simulate the pyrotechnic shock environment in the related art cannot be adaptively adjusted according to the different tested parts, cannot simulate the real pyrotechnic shock environment well, and is not conducive to the promotion of the laser excitation simulation method is improved.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0023] Figure 1 A structural diagram of a pyrotechnic impact simulation system provided according to an embodiment of the present application;

[0024] Figure 2 is a structural schematic diagram of a pyrotechnic impact simulation system according to an embodiment of the present application;

[0025] Figure 3 A schematic diagram of the structure of an impact device of a pyrotechnic impact simulation system according to an embodiment of the present application;

[0026] Figure 4 A schematic diagram of the impact principle of an impact device of a pyrotechnic impact simulation system according to an embodiment of the present application;

[0027] Figure 5 is a structural schematic diagram of a pyrotechnic impact simulation system according to another embodiment of the present application;

[0028] Figure 6 is a schematic structural diagram of an adjustment device in an extended state according to an embodiment of the present application;

[0029] Figure 7 is a schematic structural diagram of an adjustment device in a retracted state according to an embodiment of the present application;

[0030] Figure 8 is a structural schematic diagram of a pyrotechnic impact simulation system according to yet another embodiment of the present application;

[0031] Fig. 9 is a flow chart of a method for simulating explosive impact according to an embodiment of the present application;

[0032] Fig.10 A schematic diagram of the working principle of the pyrotechnic impact simulation method according to an embodiment of the present application;

[0033] Fig.11 Schematic diagram of the impact response spectrum of the pyrotechnic impact simulation method according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0035] The pyrotechnic shock simulation system and method of the embodiment of the present application are described below with reference to the accompanying drawings. In view of the related technologies mentioned in the above background technology center, the target shock response generated by the device that uses laser shock to simulate the pyrotechnic shock environment cannot be adaptively adjusted according to the different tested pieces, and cannot simulate the real pyrotechnic shock environment well, which is not conducive to the promotion of laser excitation simulation methods. In this system, laser shock can be used as the shock source, and the shock device can be used to simulate the real pyrotechnic shock environment, and the vibration response data generated after the shock is collected. Therefore, the present application provides a new type of pyrotechnic shock simulation device with laser as the excitation source that can adjust the target shock response, which can well realize the simulation of the real pyrotechnic shock environment, and improve the problems of other related devices and technologies that use laser shock to simulate the pyrotechnic shock environment, such as the difficulty in regulating the target shock response, which is not conducive to the promotion of laser excitation simulation methods.

[0036] Specifically, Figure 1 The present invention is a structural diagram of a pyrotechnic impact simulation system provided according to an embodiment of the present application.

[0037] like Figure 1 As shown, the pyrotechnic impact simulation system 10 includes: a supporting device 100 , a carrying device 200 , an impact device 300 , a laser generating device 400 , a data measuring device 500 and a collection system 600 .

[0038] Specifically, the carrying device 200 is suspended on the supporting device 100 , and the carrying device 200 is used to carry the tested piece.

[0039] The impact device 300 is disposed on a side of the carrying device 200 facing away from the tested object. The impact device 300 is used to impact the carrying device 200 so that the carrying device 200 and the tested object generate a vibration response.

[0040] Specifically, the support device 100 in the embodiment of the present application may be a bracket to facilitate hanging the load-bearing device 200. In some embodiments, the embodiment of the present application may connect a flexible member between the support device 100 and the load-bearing device 200, so that the load-bearing device 200 is freely hung on the support device 100. For example, the flexible member may be a flexible cable, one end of which is fixed to the support device 100, and the other end of which is fixed to the load-bearing device 200, so that the load-bearing device 200 is in a hanging state.

[0041] Specifically, the impact device 300 of the embodiment of the present application can not only increase the impact level on the bearing device 200, but also adjust the form of the impact load.

[0042] The structural composition of the impact device 300 will be described in detail below.

[0043] Optionally, in one embodiment of the present application, the impact device 300 includes: a cylinder, one end of which is connected to the supporting device 200; an impact piece, which is slidably connected to the cylinder; a constraint layer, which is fixedly arranged in the cylinder and is located on the side of the impact piece facing the laser generating device 400; an absorption layer, which is arranged on the surface of the impact piece, and the absorption layer is located between the impact piece and the constraint layer, and the absorption layer is in contact with the constraint layer; wherein the constraint layer is arranged to be transparent to the laser, so that the laser can pass through the constraint layer and be incident on the absorption layer; the surface material of the absorption layer melts, evaporates, and forms plasma under the action of the laser, so that the plasma pushes the impact piece to slide in the cylinder under the constraint of the constraint layer, and the impact piece slides and impacts the supporting device 200 under the push of the plasma.

[0044] For example, the absorption layer in the embodiment of the present application can be set to have a low heat of vaporization. After the absorption layer absorbs the energy of the laser, the surface material in the absorption layer evaporates quickly to form gas molecules, and continues to absorb the energy of the laser to form a rapidly expanding dense plasma. The plasma produces a very high magnitude instantaneous impact on the confinement layer and the impact piece. Since the confinement layer is fixed in the cylinder, and the side of the impact piece away from the absorption layer is atmospheric pressure air, the impedance of which is much smaller than that of the confinement layer, so that the plasma pushes the impact piece to slide toward the bearing device 200 with a great impact force, and impacts the bearing device 200 at a very high speed, so that the bearing device 200 produces a high-frequency, high-magnitude vibration response, thereby achieving a simulation of a real pyrotechnic impact environment.

[0045] In some embodiments, the impact piece may be a flying sheet, the constraining layer may be a transparent glass or an organic film, and the absorbing layer may be an aluminum foil. Preferably, the thickness of the absorbing layer should be as thin as possible.

[0046] Optionally, in one embodiment of the present application, the inner surface of the cylinder is coated with a lubricant to reduce energy loss caused by sliding of the impact piece inside the cylinder and to increase the impact strength of the impact piece on the bearing device 200 .

[0047] In the actual implementation process, the inner surface of the cylinder in the embodiment of the present application may be coated with a low-damping lubricant, which can reduce the friction between the impact piece and the cylinder when the impact piece slides, thereby enhancing the impact force of the impact piece on the bearing device 200. In the embodiment of the present application, the lubricant can be any lubricating substance that can reduce friction, such as lubricating oil and graphite, and is not specifically limited here.

[0048] The laser generating device 400 is used to emit laser to the impact device 300, so that the impact device 300 impacts the bearing device 200 under the action of the laser, so as to simulate a real pyrotechnic impact environment.

[0049] Specifically, the laser generating device 400 can emit a high-energy-density laser to generate a laser shock on the surface of the impact device 300. The impact device 300 can impact the supporting device 200 under the action of the laser, and generate a high-frequency, instantaneous, high-level vibration response on the surface of the supporting device 200. The vibration response will propagate in the form of a stress wave, causing the test piece on the other side to also vibrate violently, thereby simulating the actual pyrotechnic impact that the test piece is subjected to.

[0050] The data measuring device 500 is connected to a side of the carrying device 200 carrying the test piece, and is used to measure vibration response data generated by the carrying device 200 and / or the test piece after being impacted.

[0051] For example, the data measuring device 500 may be an acceleration sensor, which may be attached to a side of the carrying device 200 facing away from the laser generating device 400 to measure vibration responses at different positions of the carrying device 200 .

[0052] Optionally, in an embodiment of the present application, there are multiple data measuring devices 500 , which are disposed at different positions of the carrying device 200 to measure vibration response data at different positions of the carrying device 200 .

[0053] Specifically, a plurality of data measuring devices 500 can be connected to any position of the carrier device 200 according to actual needs to measure the pyrotechnic impact response at different positions.

[0054] Optionally, in one embodiment of the present application, the data measuring device 500 is installed on the test piece to measure the vibration response data of the test piece.

[0055] For example, the data measuring device 500 can be connected to the test piece on the surface of the carrying device 200 to measure the vibration response data near the installation position of the test piece. In particular, since the data measuring device 500 cannot be installed at the installation position of the test piece of the carrying device 200, it is impossible to directly measure the vibration response of this position of the carrying device 200. During the measurement process, the vibration response of a point near the installation position of the test piece can be used as an approximate replacement, so that the vibration response of the data measuring device 500 and the test piece are close enough, so that the measured vibration response data can reflect the vibration response of the test piece, so as to simulate the real pyrotechnic impact environment to which the test piece is subjected.

[0056] The acquisition system 600 is connected to the data measuring device 500 and is used to acquire vibration response data.

[0057] In actual implementation, the acquisition system 600 may be connected to a plurality of data measuring devices 500 respectively, so as to acquire vibration response data measured by the plurality of data measuring devices 500 .

[0058] Optionally, in one embodiment of the present application, the pyrotechnic impact simulation system 10 further includes: a buffer, which is disposed at one end of the cylinder and fixedly disposed on the surface of the carrier 200 to adjust the impact duration and impact magnitude of the impact member on the carrier 200.

[0059] For example, the buffer member may be a rubber pad, which is disposed at the end of the cylinder and fixed to the surface of the carrying device 200. The buffer member may be adhered to the surface of the carrying device 200.

[0060] In the actual implementation process, the buffer can change the impact load waveform borne by the load-bearing device 200, so as to adjust the impact response spectrum of the load-bearing device 200 and the test piece. Among them, the material and thickness of the buffer can be adjusted, so as to adjust the impact duration of the impact piece on the load-bearing device 200. In addition, the buffer can also prevent the impact of the impact piece from causing damage to the load-bearing device 200. In some embodiments, the target impact response can also be adjusted by adjusting the type and thickness of the impact piece.

[0061] Optionally, in one embodiment of the present application, the pyrotechnic impact simulation system 10 further includes: an adjustment device, the adjustment device being connected to a side of the supporting device 200 facing away from the laser generating device 400, wherein the adjustment device is installed on the test piece to adjust the vibration response generated on the test piece.

[0062] In the actual implementation process, in addition to being affected by the parameters of the impact source itself, the impact response spectrum corresponding to the vibration response of the load-bearing device 200 also depends on the resonant frequency of the load-bearing device 200 itself. When the impact frequency corresponding to the high-frequency impact matches the resonant frequency of the load-bearing device 200, the load-bearing device 200 resonates, and the resonant frequency is associated with the inflection point frequency of the impact response spectrum generated by the load-bearing device 200. In this embodiment, by providing an adjustment device on the load-bearing device 200 and installing the test piece on the adjustment device, the inflection point frequency of the impact response spectrum generated by the test piece can be adjusted by adjusting the resonant frequency of the load-bearing device 200 and the adjustment device, thereby adjusting the impact response spectrum generated by the test piece.

[0063] Optionally, in one embodiment of the present application, the adjustment device is retractable along its length direction to adjust the resonant frequency of the adjustment device.

[0064] Specifically, the embodiment of the present application can change the length of the adjustment device by stretching and contracting, thereby changing the resonant frequency of the adjustment device.

[0065] Optionally, in one embodiment of the present application, the adjustment device includes: a plurality of resonant rods, the plurality of resonant rods are connected in sequence along the length direction, the diameters of the plurality of resonant rods are reduced in sequence, and the resonant rods are slidably connected in adjacent resonant rods to adjust the length of the adjustment device.

[0066] For example, Figure 7 As shown, Figure 7 The schematic diagram of the structure of the adjustment device in a contracted state according to an embodiment of the present application is shown in FIG. 1 . The adjustment device may include three resonance rods, which are connected in sequence and have diameters that decrease in sequence. The resonance rods are hollow, and the second resonance rod is slidably connected to the first resonance rod, and the third resonance rod is slidably connected to the second resonance rod, so that the length of the adjustment device can be changed by stretching. Specifically, Figure 6 As shown, Figure 6 FIG. 1 is a schematic diagram of the structure of an adjustment device in an extended state according to an embodiment of the present application. The adjustment device is in the extended state, and each resonant rod is located outside the adjacent resonant rod; Figure 7 As shown, the adjustment device is in a retracted state, and the remaining resonant rods are all retracted inside the first resonant rod.

[0067] Combine the following Figures 2 to 8 As shown, the working principle of the pyrotechnic impact simulation system 10 of the embodiment of the present application is described in detail with a specific embodiment.

[0068] like Figures 2 to 8As shown, the present application may include: a supporting device 100, a carrying device 200, a test piece 201, an impact device 300, a cylinder 301, an impact piece 302, a constraint layer 303, an absorption layer 304, a plasma 305, a laser generating device 400, a laser 401, a data measuring device 500, an acquisition system 600, a buffer 700, an adjustment device 800, a first resonant rod 801, a second resonant rod 802, a third resonant rod 803 and a flexible member 900.

[0069] In some embodiments, the tested component 201 may be a spacecraft component to be tested, so the pyrotechnic shock simulation system in this embodiment may be used to simulate the actual pyrotechnic shock environment to which the spacecraft component is subjected. By testing the normal performance of the tested component 201 after the pyrotechnic shock, the pyrotechnic shock resistance of the spacecraft component can be verified, thereby improving the success rate of the space flight mission.

[0070] In some embodiments, the supporting device 100 may be a bracket to facilitate hanging the carrying device 200 .

[0071] like Figure 2 As shown, Figure 2 is a structural diagram of a pyrotechnic impact simulation system according to an embodiment of the present application. In some embodiments, the pyrotechnic impact simulation system may further include a flexible member 900, which is connected between the support device 100 and the load-bearing device 200, so that the load-bearing device 200 is freely suspended from the support device 100. The flexible member 900 may be a flexible cable, one end of which is fixed to the support device 100, and the other end of which is fixed to the load-bearing device 200, so that the load-bearing device 200 is in a suspended state.

[0072] In the actual implementation process, the test piece 201 is installed on the side of the supporting device 200 facing away from the laser generating device 400. The laser generating device 400 is used to emit a high-energy density laser 401 to generate laser shock on the surface of the impact device 300. The impact device 300 can impact the supporting device 200 under the action of the laser 401, and generate a high-frequency, high-level instantaneous shock response on the surface of the supporting device 200. The shock response will propagate in the form of a stress wave, causing the test piece 201 on the other side to also vibrate violently, thereby simulating the actual pyrotechnic shock that the test piece 201 is subjected to.

[0073] In some embodiments, the impact device 300 is bonded to the surface of the carrier device 200. Figure 3 As shown, Figure 33 is a schematic diagram of the structure of the impact device of the pyrotechnic impact simulation system according to an embodiment of the present application, wherein the impact piece 302 is slidably connected to the cylinder 301. The constraint layer 303 is fixed in the cylinder 301 and is located on the side of the impact piece 302 facing the laser generating device 400. The absorption layer 304 is arranged on the surface of the impact piece 302, and the absorption layer 304 is located between the impact piece 302 and the constraint layer 303, and the absorption layer 304 is in contact with the constraint layer 303. Among them, the constraint layer 303 is arranged to be transparent to the laser 401, so that the laser 401 passes through the constraint layer 303 and is incident on the absorption layer 304, and the surface material of the absorption layer 304 is melted and evaporated under the action of the laser to form a plasma 305, and the plasma 305 will push the impact piece 302 to slide in the cylinder 301 under the constraint of the constraint layer 303, and the impact piece 302 slides and impacts the bearing device 200 under the push of the plasma 305. By providing the impact device 300 , not only the impact level on the bearing device 200 can be increased, but also the form of the impact load can be adjusted.

[0074] like Figure 4 As shown, Figure 4 This is a schematic diagram of the impact principle of the impact device of the pyrotechnic impact simulation system according to the embodiment of the present application. In the embodiment of the present application, when the laser 401 emitted by the laser generating device 400 is projected onto the impact device 300, the laser 401 passes through the transparent confinement layer 303 and directly acts on the absorption layer 304 to generate a rapidly expanding plasma 305 between the impact member 302 and the confinement layer 303. The plasma 305 can push the impact member 302 to move at a high speed and hit the supporting device 200, so that the supporting device 200 generates a vibration response.

[0075] Specifically, the absorption layer 304 in the embodiment of the present application can be set to have a lower heat of vaporization. After the absorption layer 304 absorbs the energy of the laser 401, the surface material in the absorption layer 304 evaporates quickly to form gas molecules, and continues to absorb the energy of the laser 401 to form a rapidly expanding dense plasma 305. The plasma 305 produces a very high magnitude instantaneous impact on the confinement layer 303 and the impact member 302. Since the confinement layer 303 is fixed in the cylinder 301, and the side of the impact member 302 away from the absorption layer 304 is atmospheric pressure air, the impedance of which is much smaller than that of the confinement layer 303, the plasma 305 pushes the impact member 302 to slide toward the bearing device 200 with a great impact force, and impacts the bearing device 200 at a very high speed, so that the bearing device 200 produces a high-frequency, high-magnitude vibration response, thereby achieving a simulation of a real pyrotechnic impact environment.

[0076] In some embodiments, the impact member 302 may be a flying sheet, the constraining layer 303 may be a transparent glass or an organic film, and the absorbing layer 304 may be an aluminum foil. Preferably, the absorbing layer 304 should be as thin as possible.

[0077] In some embodiments, the inner surface of the cylinder 301 is coated with a lubricant to increase the impact strength of the impact member 302 on the carrier 200. In the embodiment of the present application, the inner surface of the cylinder 301 is coated with a low-damping lubricant, which can reduce the friction between the impact member 302 and the cylinder 301 when the impact member 302 slides, thereby enhancing the impact force of the impact member 302 on the carrier 200. The lubricant can be any lubricating substance that can reduce friction, such as lubricating oil and graphite.

[0078] In some embodiments, the embodiment of the present application further includes a buffer 700, which may be a rubber pad disposed at the end of the cylinder 301 and fixed to the surface of the carrier 200. In some embodiments, the buffer 700 is adhered to the surface of the carrier 200.

[0079] Specifically, the buffer 700 can change the impact load waveform borne by the load-bearing device 200, thereby adjusting the impact response spectrum of the load-bearing device 200 and the test piece 201. In the embodiment of the present application, the material and thickness of the buffer 700 can be adjusted, thereby adjusting the impact duration of the impact member 302 on the load-bearing device 200. In addition, the buffer 700 can also prevent the impact of the impact member 302 from causing damage to the load-bearing device 200. In some embodiments, the target impact response can also be adjusted by adjusting the type and thickness of the impact member 302.

[0080] In some embodiments, the test piece 201 can be installed at any position on the side of the carrier 200 facing away from the laser generating device 400, so as to simulate the pyrotechnic impact response under different working conditions. The installation position of the test piece 201 can be selected according to actual needs.

[0081] like Figure 2 As shown, in some embodiments, the number of data measuring devices 500 can be multiple, and the multiple data measuring devices 500 are arranged at different positions of the carrying device 200 to measure the vibration response data of different positions of the carrying device 200. In the embodiment of the present application, the multiple data measuring devices 500 can be connected to any position of the carrying device 200 according to actual needs to measure the pyrotechnic impact response at different positions.

[0082] Furthermore, the acquisition system 600 is connected to the plurality of data measuring devices 500 respectively, so as to acquire the vibration response data measured by the plurality of data measuring devices 500 .

[0083] In some embodiments, the data measuring device 500 is an acceleration sensor, which can be attached to a side of the carrier device 200 facing away from the laser generating device 400 to measure vibration responses at different positions of the carrier device 200 .

[0084] Furthermore, the data measuring device 500 is connected to the vicinity of the tested piece 201 on the surface of the carrying device 200 to measure the vibration response data near the installation position of the tested piece 201. In the embodiment of the present application, since the data measuring device 500 cannot be installed at the installation position of the tested piece 201 of the carrying device 200, it is impossible to directly measure the vibration response of this position of the carrying device 200. During the measurement process, the vibration response of a point near the installation position of the tested piece 201 is used as an approximate replacement, so that the vibration response of the data measuring device 500 and the tested piece 201 are close enough, so that the measured vibration response data can reflect the vibration response of the tested piece 201, so as to simulate the real pyrotechnic impact environment to which the tested piece 201 is subjected.

[0085] like Figure 5 As shown, Figure 5 Schematic diagram of the structure of a pyrotechnic impact simulation system according to another embodiment of the present application. In some embodiments, the present application embodiment further includes an adjustment device 800, which is connected to the side of the carrier device 200 facing away from the laser generating device 400. The adjustment device 800 is used to install the test piece 201, and the adjustment device 800 is used to adjust the vibration response generated by the test piece 201.

[0086] In the embodiment of the present application, in addition to being affected by the parameters of the impact source itself, the impact response spectrum corresponding to the vibration response of the load-bearing device 200 also depends on the resonant frequency of the load-bearing device 200 itself. When the impact frequency corresponding to the high-frequency impact matches the resonant frequency of the load-bearing device 200, the load-bearing device 200 resonates, and the resonant frequency is associated with the inflection point frequency of the impact response spectrum generated by the load-bearing device 200. In this embodiment, by setting an adjustment device 800 on the load-bearing device 200 and installing the test piece 201 on the adjustment device 800, the inflection point frequency of the impact response spectrum generated by the test piece 201 can be adjusted by adjusting the resonant frequency of the load-bearing device 200 and the adjustment device 800, thereby adjusting the impact response spectrum generated by the test piece 201.

[0087] like Figure 6 and Figure 7 As shown, the embodiment of the present application can change the length of the adjustment device 800 by stretching and contracting, thereby changing the resonant frequency of the adjustment device 800.

[0088] As Figure 7Taking the adjustment device 800 shown in FIG. 1 as an example, the adjustment device 800 may include three resonance rods, which are connected in sequence, and the diameters of the three resonance rods are reduced in sequence. The resonance rods are hollow, and the second resonance rod 802 is slidably connected to the first resonance rod 801, and the third resonance rod 803 is slidably connected to the second resonance rod 802, so that the length of the adjustment device 800 can be changed by stretching. Specifically, as Figure 6 As shown, the adjustment device 800 is in an extended state, and each resonant rod is located outside the adjacent resonant rod; Figure 7 As shown, the adjustment device 800 is in a retracted state, and the remaining resonant rods are all retracted into the first resonant rod 801 .

[0089] In some embodiments, a fixing member is connected between two adjacent resonant rods, which is used to fix the two adjacent resonant rods after adjusting the length of the adjustment device 800 to prevent displacement between the resonant rods, thereby achieving the fixation of the length of the adjustment device 800 during the simulation test. In some embodiments, the fixing member is a bolt.

[0090] like Figure 8 As shown, Figure 8 This is a structural diagram of a pyrotechnic impact simulation system according to another embodiment of the present application. In some embodiments, the data measuring device 500 is installed on the adjustment device 800 and is located near the test piece 201, and is used to measure the vibration response data of the adjustment device 800 near the test piece 201, and obtain the impact response spectrum of the adjustment device 800. It is worth noting that the data measuring device 500 should be a three-axis data measuring device 500 at this time, so as to realize the measurement of the vibration response data near the test piece 201 along the main vibration direction of the test piece 201.

[0091] like Figure 5 As shown, in some embodiments, the data measuring device 500 is installed on the test piece 201 to measure the vibration response data of the test piece 201 and obtain the impact response spectrum of the test piece 201, so as to determine whether the impact borne by the test piece 201 is consistent with the actual pyrotechnic impact environment.

[0092] In some embodiments, the cross-section of the adjustment device 800 is a triangle, a rectangle or other polygons. In this embodiment, the cross-section of the adjustment device 800 is not a circle, which facilitates the installation and fixation of the tested device 201 and the data measurement device 500.

[0093] Furthermore, combined with Fig. 9 and Fig.10 As shown, the pyrotechnic impact simulation system 10 of the embodiment of the present application may include the following steps during actual application:

[0094] like Fig. 9As shown, Fig. 9 The flowchart of the pyrotechnic impact simulation method according to the embodiment of the present application is as follows. The pyrotechnic impact simulation method according to the embodiment of the present application specifically includes the following steps:

[0095] Step S1: Determine the expected impact response spectrum of the test piece 201 .

[0096] Step S2: adjusting the resonant frequency of the adjustment device 800 in the pyrotechnic impact simulation system 10 .

[0097] Step S3: adjusting the buffer 700 of the pyrotechnic impact simulation system 10 .

[0098] Step S4: adjusting the output power of the laser generating device 400 .

[0099] Step S5: measuring and collecting the impact response spectrum of the test piece 201 after being impacted.

[0100] Step S6: Compare the expected shock response spectrum with the shock response spectrum.

[0101] In this embodiment, if Fig.10 As shown, Fig.10 Schematic diagram of the working principle of the pyrotechnic impact simulation method according to the embodiment of the present application, the characteristic parameters of the impact response spectrum include the inflection point frequency and the high-frequency amplitude. Among them, the inflection point frequency of the impact response spectrum is the frequency corresponding to the inflection point A, and the high-frequency segment amplitude of the impact response spectrum is the amplitude corresponding to the horizontal segment of the impact response spectrum. In the embodiment of the present application, the expected impact response spectrum is the impact response spectrum corresponding to the test piece 201 under the pyrotechnic impact required to be borne.

[0102] In step S1, the embodiment of the present application can determine the inflection point frequency and high frequency amplitude of the expected impact response spectrum generated after the tested object 201 is subjected to pyrotechnic impact. The expected impact response spectrum corresponds to the pyrotechnic impact that the tested object 201 is required to withstand, and can be determined in advance according to the pyrotechnic environment that the tested object 201 is required to withstand.

[0103] In some embodiments, the adjustment device 800 is retractable along its length. In step S2, the embodiment of the present application can adjust the length of the adjustment device 800 to adjust the resonant frequency of the adjustment device 800 to be the same as the inflection point frequency of the expected impact response spectrum, so that the adjustment device 800 can resonate during the subsequent simulation test.

[0104] In some embodiments, in step S3, the embodiment of the present application can adjust the material and / or thickness of the buffer member 700 to adjust the impact duration of the impact device 300 on the load-bearing device 200, so that when the impact device 300 impacts the load-bearing device 200, it can excite the adjustment device 800 to axially resonate, thereby achieving control of the inflection point frequency of the impact response spectrum, so that the inflection point frequency of the obtained impact response spectrum corresponds to the resonance frequency.

[0105] Specifically, in step S3, when the damping of the material of the buffer 700 decreases, the impact duration increases; when the thickness of the buffer 700 increases, the impact duration increases. By adjusting the impact duration, the frequency corresponding to the impact duration matches the resonant frequency of the axial resonance of the adjustment device 800, thereby exciting the axial resonance of the adjustment device 800 and achieving control of the inflection point frequency of the impact response spectrum.

[0106] In addition, when adjusting the buffer 700, as the damping of the material of the buffer 700 decreases or the thickness increases, the impact duration increases, and the impact amplitude of the impact device 300 decreases. In order to adjust the high-frequency amplitude of the obtained impact response spectrum, in the embodiment of the present application, the buffer 700 is first adjusted, and then the output power of the laser generating device 400 is adjusted, so that the inflection point frequency and high-frequency amplitude of the finally obtained impact response spectrum can be consistent with the expected impact response spectrum, thereby correcting the impact of the buffer 700 on the amplitude of the impact response spectrum.

[0107] In the embodiment of the present application, the high frequency amplitude of the shock response spectrum obtained in step S5 increases with the increase of the output power of the laser generating device 400. In step S4, the output power of the laser generating device 400 can be gradually increased until the high frequency amplitude of the shock response spectrum obtained is equal to the high frequency amplitude of the expected shock response spectrum, so that the shock borne by the test piece 201 is consistent with the actual pyrotechnic shock environment.

[0108] In some embodiments, the shock response spectrum of the test piece 201 may be measured and collected in real time, so that the buffer 700 and the laser generating device 400 may be adjusted according to the obtained shock response spectrum.

[0109] In some embodiments, step S6 further includes: when the error between the expected impact response spectrum and the impact response spectrum does not meet the predetermined requirement, repeating steps S3 to S5 until the error meets the predetermined requirement.

[0110] In the embodiment of the present application, the mutual influence between the change of the material and thickness of the buffer 700 in step S3 and the output power of the laser generating device 400 in step S4 is taken into consideration, and the shock response spectrum is adjusted by iteratively adjusting the material damping and thickness of the buffer 700 and the output power of the laser generating device 400 until the error between the shock response spectrum and the expected shock response spectrum meets the predetermined requirements, thereby achieving the simulation of the real pyrotechnic impact and making the impact borne by the test piece 201 consistent with the actual pyrotechnic impact environment.

[0111] In some embodiments, in step S6, the embodiment of the present application can calculate the average error coefficient between the expected shock response spectrum and the shock response spectrum according to the expected curve of the expected shock response spectrum corresponding to each frequency within the frequency analysis range and the curve of the obtained shock response spectrum. In the embodiment of the present application, the predetermined requirement includes: the average error coefficient is less than or equal to a preset threshold. The preset threshold can be set according to actual needs.

[0112] Specifically, the embodiment of the present application can use the following formula to calculate the average error coefficient σ between the expected shock response spectrum and the shock response spectrum: E , which can be expressed as:

[0113]

[0114] Among them, σ E is the average error coefficient between the shock response spectrum obtained in this application and the expected shock response spectrum; f0 is the minimum frequency of the frequency analysis range of the shock response spectrum; f N is the maximum frequency of the frequency analysis range of the shock response spectrum; is the vertical axis value of the expected impact response spectrum at frequency f; is the vertical axis value of the measured impact response spectrum at frequency f.

[0115] The embodiment of the present application can compare the expected shock response spectrum with the shock response spectrum by calculating the average error coefficient between the expected shock response spectrum and the shock response spectrum. When the average error coefficient is less than or equal to the threshold, that is, the predetermined requirement is met, the shock response spectrum is obtained, and the simulation test of the pyrotechnic shock of the test piece 201 is completed. When the average error coefficient is greater than the threshold, that is, the predetermined requirement is not met, steps S3 to S5 are repeated to iteratively adjust the shock response spectrum until the shock response spectrum meets the predetermined requirement.

[0116] According to the pyrotechnic shock simulation system proposed in the embodiment of the present application, laser shock can be used as the shock source, and the shock device can be used to simulate the real pyrotechnic shock environment, and the vibration response data generated after the shock can be collected. The adjustment device can also be used to achieve the regulation of the shock response spectrum. Therefore, the present application provides a new type of pyrotechnic shock simulation device with laser as the excitation source that can adjust the target shock response, which can well achieve the simulation of the real pyrotechnic shock environment, improve the difficulty of regulating the target shock response in other related devices and technologies that use laser shock to simulate the pyrotechnic shock environment, and are not conducive to the promotion of laser excitation simulation methods.

[0117] Next, the pyrotechnic impact simulation method proposed in accordance with the embodiment of the present application is described with reference to the accompanying drawings.

[0118] Fig.11 Schematic diagram of the impact response spectrum of the pyrotechnic impact simulation method according to an embodiment of the present application.

[0119] like Figure 1 As shown, the pyrotechnic impact simulation method comprises the following steps:

[0120] In step S1101, the expected impact response spectrum of the test piece is determined according to the pyrotechnic impact that the test piece is required to withstand.

[0121] In step S1102 , the resonant frequency of the pyrotechnic impact simulation system is adjusted so that the resonant frequency is the same as the inflection point frequency of the expected impact response spectrum.

[0122] Optionally, in one embodiment of the present application, adjusting the resonant frequency of the pyrotechnic impact simulation system includes: adjusting the resonant frequency by adjusting the length of the adjustment device.

[0123] In step S1103, the pyrotechnic impact simulation system is adjusted to adjust the impact duration of the impact device on the bearing device so that the adjustment device resonates to match the inflection point frequency.

[0124] Optionally, in one embodiment of the present application, adjusting the pyrotechnic impact simulation system includes: adjusting the material and / or thickness of the buffer component to adjust the impact duration of the impact device on the load-bearing device.

[0125] In step S1104, the output power of the laser generating device is adjusted according to the high frequency amplitude of the expected impulse response spectrum.

[0126] In step S1105, the impact response spectrum of the test piece after being impacted is measured and collected.

[0127] In step S1106, the expected shock response spectrum is compared with the shock response spectrum, wherein when the error between the expected shock response spectrum and the shock response spectrum meets a predetermined requirement, the shock response spectrum is obtained, and the pyrotechnic shock simulation test on the tested piece is completed.

[0128] Optionally, in one embodiment of the present application, the pyrotechnic impact simulation method further includes: when the error between the expected impact response spectrum and the impact response spectrum does not meet a predetermined requirement, repeating the above steps until the error meets the predetermined requirement.

[0129] Optionally, in one embodiment of the present application, comparing the expected shock response spectrum with the shock response spectrum includes: calculating an average error coefficient between the expected shock response spectrum and the shock response spectrum based on expected acceleration response amplitudes of the expected shock response spectrum corresponding to each frequency within the frequency analysis range and the acceleration response amplitudes of the shock response spectrum; wherein the predetermined requirements include: the average error coefficient is less than or equal to a preset threshold.

[0130] It should be noted that the aforementioned explanation of the pyrotechnic impact simulation system embodiment is also applicable to the pyrotechnic impact simulation method of this embodiment, and will not be repeated here.

[0131] According to the pyrotechnic shock simulation method proposed in the embodiment of the present application, laser shock can be used as the shock source, and the shock device can be used to simulate the real pyrotechnic shock environment, and the vibration response data generated after the shock can be collected. The adjustment device can also be used to achieve the regulation of the shock response spectrum. Therefore, the present application provides a new type of pyrotechnic shock simulation device with laser as the excitation source that can adjust the target shock response, which can well achieve the simulation of the real pyrotechnic shock environment, improve the difficulty of regulating the target shock response in other related devices and technologies that use laser shock to simulate the pyrotechnic shock environment, and are not conducive to the promotion of laser excitation simulation methods.

[0132] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0133] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0134] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0135] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, which can be embodied in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processor or other system that can fetch instructions from an instruction execution system, apparatus or device and execute instructions), or used in combination with these instruction execution systems, apparatuses or devices.

Claims

1. A pyrotechnic impact simulation system, characterized in that: include: Support device; A load-bearing device, the load-bearing device is suspended on the supporting device, and the load-bearing device is used to bear the tested piece; An impact device, the impact device is arranged on a side of the bearing device facing away from the tested object, and the impact device is used to impact the bearing device so that the bearing device and the tested object generate a vibration response; A laser generating device, used for emitting laser to the impact device, so that the impact device impacts the bearing device under the action of the laser, so as to simulate a real pyrotechnic impact environment; A data measuring device, the data measuring device is connected to a side of the bearing device carrying the tested object, and the data measuring device is used to measure vibration response data generated by the bearing device and / or the tested object after being impacted; An acquisition system, the acquisition system is connected to the data measuring device, and the acquisition system is used to acquire the vibration response data; Also includes: An adjusting device, the adjusting device being connected to a side of the carrying device facing away from the laser generating device, wherein the adjusting device is mounted on the tested piece to adjust the vibration response generated on the tested piece; The adjusting device is retractable along its length direction to adjust the resonant frequency of the adjusting device.

2. The pyrotechnic impact simulation system according to claim 1, characterized in that: The impact device comprises: A cylinder, one end of which is connected to the carrying device; An impact member, the impact member being slidably connected to the cylinder; A constraint layer, the constraint layer is fixedly disposed in the cylinder and is located on a side of the impact member facing the laser generating device; An absorption layer, wherein the absorption layer is disposed on the surface of the impact member, the absorption layer is located between the impact member and the constraint layer, and the absorption layer is in contact with the constraint layer; Wherein, the constraint layer is configured to be transparent to laser, so that the laser can pass through the constraint layer and be incident on the absorption layer; the surface material of the absorption layer melts, evaporates and forms plasma under the action of the laser, so that the plasma pushes the impact piece to slide in the cylinder and impact the supporting device under the constraint of the constraint layer.

3. The pyrotechnic impact simulation system according to claim 2, characterized in that: The inner surface of the cylinder is coated with a lubricant to reduce the energy loss caused by the sliding of the impact piece inside the cylinder and to increase the impact strength of the impact piece on the bearing device.

4. The pyrotechnic impact simulation system according to claim 2, characterized in that: Also includes: A buffer is arranged at one end of the cylinder and fixedly arranged on the surface of the bearing device to adjust the impact duration and impact magnitude of the impact member on the bearing device.

5. The pyrotechnic impact simulation system according to claim 1, characterized in that: There are multiple data measuring devices, which are arranged at different positions of the carrying device to measure the vibration response data at different positions of the carrying device.

6. The pyrotechnic impact simulation system according to claim 1, characterized in that: The adjusting device comprises: A plurality of resonant rods are connected in sequence along the length direction, the diameters of the plurality of resonant rods are reduced in sequence, and the resonant rods can be slidably connected in adjacent resonant rods to adjust the length of the adjusting device.

7. The pyrotechnic impact simulation system according to claim 1, characterized in that: The data measuring device is installed on the adjusting device to measure the vibration response data of the tested piece.

8. A method for simulating explosive impact, characterized in that: Utilize the pyrotechnic impact simulation system according to any one of claims 1 to 7, wherein the method comprises the following steps: Determining an expected impact response spectrum of the tested object according to the pyrotechnic impact that the tested object is required to withstand; Adjusting the resonant frequency of the pyrotechnic impact simulation system so that the resonant frequency is the same as the inflection point frequency of the expected impact response spectrum; Adjusting the pyrotechnic impact simulation system to adjust the impact duration of the impact device on the bearing device so that the adjustment device resonates to match the inflection point frequency; According to the high frequency amplitude of the expected impulse response spectrum, adjusting the output power of the laser generating device; Measuring and collecting the impact response spectrum of the tested object after being impacted; The expected shock response spectrum is compared with the shock response spectrum, wherein when the error between the expected shock response spectrum and the shock response spectrum meets a predetermined requirement, the shock response spectrum is obtained, and the pyrotechnic shock simulation test on the tested piece is completed.

9. The pyrotechnic impact simulation method according to claim 8, characterized in that: Also includes: When the error between the expected shock response spectrum and the shock response spectrum does not meet the predetermined requirement, the above steps are repeated until the error meets the predetermined requirement.

10. The pyrotechnic impact simulation method according to claim 8 or 9, characterized in that: The comparing the expected shock response spectrum with the shock response spectrum comprises: The average error coefficient between the expected shock response spectrum and the shock response spectrum is calculated based on the expected acceleration response amplitude of the expected shock response spectrum corresponding to each frequency within the frequency analysis range and the acceleration response amplitude of the shock response spectrum; wherein the predetermined requirement includes: the average error coefficient is less than or equal to a preset threshold.

11. The pyrotechnic impact simulation method according to claim 8 or 9, characterized in that: The step of adjusting the resonant frequency of the pyrotechnic impact simulation system comprises: The resonant frequency is adjusted by adjusting the length of the adjusting device.

12. The pyrotechnic impact simulation method according to claim 8 or 9, characterized in that: The step of adjusting the pyrotechnic impact simulation system comprises: The impact duration of the impact device on the bearing device can be adjusted by adjusting the material and / or thickness of the buffer member.

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