Laser shock load enhancement device and method for estimating shock load enhancement effect

Abstract

The present application relates to a laser impact load enhancement device and an estimation method of the impact load enhancement effect, wherein the device includes: a load-bearing member; a flexible rope connected to the load-bearing member so that the load-bearing member is in a suspended state; a reinforcement member fixedly arranged on one side of the load-bearing member, including multiple layers of different impedances, and the impedance of each layer increases successively along the direction of action of the impact load; a laser, the laser is used to provide laser to the surface of the reinforcement member, and the laser generates an impact load on the reinforcement member. The impact load is enhanced under the action of multiple layers of different impedances, and a stronger vibration response is caused on the load-bearing member to better simulate the real pyrotechnic impact. The present application sets a reinforcement member so that the impact load is enhanced through multiple layers of different impedances, thereby causing a stronger impact response, increasing the impact load of the laser on the load-bearing member, better simulating the real pyrotechnic impact environment and used for pyrotechnic impact testing.

Description

Technical Field

[0001] The present application relates to the technical field of pyrotechnic impact simulation, and in particular to a laser impact load enhancement device and an estimation method for the impact load enhancement effect. Background Art

[0002] Pyrotechnic separation devices are widely used in key spacecraft working processes such as multi-stage rocket separation, component deployment, and component release. These devices will inevitably produce high-frequency, high-level, and extremely short-duration transient pyrotechnic shocks during operation. Pyrotechnic shocks may damage the precision components carried by the spacecraft, seriously threatening the successful implementation of space flight missions. In order to improve the success rate of space flight missions, it is often necessary to simulate real pyrotechnic shocks in a ground environment to test the pyrotechnic shock 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 technology, due to the limitations of parameters such as the laser power density, laser wavelength, and pulse width of the laser generator, the impact load generated by the laser excitation simulation method is of a small magnitude and cannot simulate the actual pyrotechnic impact environment well, which is not conducive to the promotion of the laser excitation simulation method and urgently needs to be improved. Summary of the invention

[0005] The present application provides a laser shock load enhancement device and a method for estimating the shock load enhancement effect, in order to improve the problems in the related art that, due to the limitations of the laser power density, laser wavelength, pulse width and other parameters of the laser generator, the magnitude of the shock load generated by the laser excitation simulation method is small, and it cannot simulate the real pyrotechnic shock environment well, which is not conducive to the promotion of the laser excitation simulation method.

[0006] The first aspect of the present application provides a laser impact load enhancement device, comprising: a bearing member; a flexible cable, the flexible cable is connected to the bearing member, so that the bearing member is in a suspended state; a reinforcement member, the reinforcement member is fixedly arranged on one side of the bearing member, the reinforcement member includes multiple layers of different impedances, and the impedance of each layer increases in sequence along the direction of the impact load; and a laser, the laser is used to provide laser light to the surface of the reinforcement member, and the laser generates the impact load on the reinforcement member. The impact load is enhanced under the action of the multiple layers of different impedances, and causes a vibration response on the bearing member to simulate the real pyrotechnic impact.

[0007] Optionally, in one embodiment of the present application, the number of layers and the impedance of the multiple layers with different impedances can be obtained from the target enhancement effect of the impact load.

[0008] Optionally, in one embodiment of the present application, surfaces of adjacent layers in the reinforcement are tightly fitted and fixedly connected to each other.

[0009] Optionally, in an embodiment of the present application, the impact action surfaces of adjacent layers of the plurality of layers with different impedances are the same in area, or the areas decrease sequentially along the action direction of the impact load.

[0010] Optionally, in one embodiment of the present application, the impedance of each layer in the layer body is smaller than the impedance of the carrier.

[0011] Optionally, in one embodiment of the present application, the lateral size of the reinforcement is equal to or greater than the size of the light spot formed by the laser projecting onto the reinforcement.

[0012] Optionally, in one embodiment of the present application, the reinforcement member is arranged so that its center position is consistent with the center position of the light spot projection position or is at least located near the center position of the light spot projection position.

[0013] Optionally, in one embodiment of the present application, the laser shock load enhancement device further includes: a constraining layer, wherein the constraining layer is arranged on a side of the enhancement member facing the laser.

[0014] Optionally, in one embodiment of the present application, the laser shock load enhancement device further includes: a water supply component, which provides flowing water to form the constrained layer.

[0015] The second aspect of the present application provides a method for estimating the impact load enhancement effect, comprising the following steps: determining the enhancement effect of each pair of adjacent layers in the layer body on the impact load when the shock wave is caused acting on the bearing member; accumulating the enhancement effect of each pair of adjacent layers in the layer body on the impact load to obtain the enhancement effect of the reinforcement member on the impact load.

[0016] Optionally, in one embodiment of the present application, the reinforcement effect of each pair of adjacent layers in the layer body is the first magnification multiple of the impact load of each pair of adjacent layers in the layer body.

[0017] Optionally, in one embodiment of the present application, the calculation formula of the first magnification is:

[0018]

[0019] Wherein, Am is the first magnification, A k and A k+1 are the impact surfaces of the kth layer and the k+1th layer in the layer body, R k and Rk+1 are the impedances of the kth layer and the k+1th layer in the layer body respectively.

[0020] Optionally, in one embodiment of the present application, the reinforcing effect of the reinforcement on the impact load is a second magnification factor of the reinforcement on the impact load, wherein the second magnification factor is obtained by multiplying the first magnification factor of the impact load of each pair of adjacent layers in the layer body of the reinforcement.

[0021] Optionally, in one embodiment of the present application, the method for estimating the impact load enhancement effect also includes: determining the magnitude of the impact load acting on the reinforcement; multiplying the magnitude of the impact load by a second magnification factor of the reinforcement on the impact load to obtain the magnitude of the enhanced impact load.

[0022] The embodiment of the present application can enhance the impact load based on the reinforcement member, and the enhancement effect can be estimated, so that the pyrotechnic impact simulated by the laser excitation method is closer to the actual pyrotechnic impact response magnitude, and the pyrotechnic impact simulation effect is improved. As a result, the problem in the related art that the magnitude of the impact load generated by the laser excitation simulation method is small due to the influence of parameters such as the laser power density, laser wavelength, and pulse width of the laser generator is improved.

[0023] 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

[0024] 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:

[0025] Figure 1 A schematic diagram of the composition of a laser shock load enhancement device provided according to an embodiment of the present application;

[0026] Figure 2 is a schematic structural diagram of a laser shock load enhancement device according to an embodiment of the present application;

[0027] Figure 3 Schematic diagram of the impact load enhancement process of the laser impact load enhancement device according to an embodiment of the present application;

[0028] Figure 4 Schematic diagram of the impact load enhancement principle of the laser impact load enhancement device according to an embodiment of the present application;

[0029] Figure 5 It is a flow chart of a method for estimating impact load enhancement effect according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] 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.

[0031] The laser shock load enhancement device and the estimation method of the shock load enhancement effect of the embodiment of the present application are described below with reference to the accompanying drawings. In view of the problem that in the related technology mentioned in the background technology center, the magnitude of the shock load generated by the laser excitation simulation method is small due to the limitation of the laser power density, laser wavelength, pulse width and other parameters of the laser generator, and it cannot simulate the real pyrotechnic shock environment well, which is not conducive to the promotion of the laser excitation simulation method, the present application provides a laser shock load enhancement device, in which the shock load can be enhanced based on the reinforcement, and the enhancement effect can be estimated, so that the pyrotechnic shock simulated by the laser excitation method is closer to the real pyrotechnic shock response magnitude, and the pyrotechnic shock simulation effect is improved. As a result, the problem that the magnitude of the shock load generated by the laser excitation simulation method is small due to the influence of the laser power density, laser wavelength, pulse width and other parameters of the laser generator in the related technology is improved.

[0032] Specifically, Figure 1 This is a schematic diagram of the composition of a laser shock load enhancement device provided according to an embodiment of the present application.

[0033] like Figure 1 As shown, the laser shock load enhancement device 10 includes: a bearing member 100 , a flexible cable 200 , a reinforcement member 300 and a laser 400 .

[0034] Specifically, the flexible cable 200 is connected to the bearing member 100, so that the bearing member 100 is in a suspended state.

[0035] In actual application, the bearing member 100 of the embodiment of the present application may be a thin and light metal plate, such as an aluminum plate, so that a smaller impact load can also cause a more obvious impact response.

[0036] For example, the flexible cable 200 of the embodiment of the present application is connected to the carrier 100, so that the carrier 100 is in a suspended state. The flexible cable 200 can be a linen rope, a rubber band, etc. The carrier 100 can be suspended from an external device such as a ceiling or a bracket through the flexible cable 200 to simulate the free boundary conditions in the space flight environment.

[0037] The reinforcement member 300 is fixedly disposed on one side of the bearing member 100 . The reinforcement member 300 includes multiple layers with different impedances. The impedance of each layer increases sequentially along the direction of the impact load.

[0038] Specifically, the reinforcement member 300 of the embodiment of the present application can be arranged to be located on one side of the carrier 100. The manner in which the reinforcement member 300 is mounted on the carrier 100 includes but is not limited to pasting, welding, etc., which is not specifically limited here.

[0039] In the actual implementation process, the impact load acts on the surface of the reinforcement 300 facing the laser to generate a shock wave, which is the stress wave of the reinforcement 300 in response to the impact load (hereinafter, the expressions "stress wave" and "shock wave" can be interchangeable), and the stress wave is transmitted along the multi-layer body of the reinforcement 300 to the other side surface of the reinforcement 300, so that the reinforcement 300 applies an impact load to the bearing member 100. The reinforcement 300 has an enhancement effect on the impact load, and the enhanced impact load acting on the bearing member 100 will cause a stronger impact response, so as to better simulate the real pyrotechnic impact environment.

[0040] Optionally, in one embodiment of the present application, the number of layers and the impedance of the multiple layers with different impedances can be obtained by the target enhancement effect of the impact load.

[0041] Specifically, the user of the laser shock load enhancement device has a certain understanding of the magnitude of the actual pyrotechnic shock load, and can also know the magnitude of the impact load of the laser 400 on the surface of the laser shock enhancement component 300. Therefore, the user's requirement is to enhance the impact load to a level close to the actual pyrotechnic shock load. The number of layers and the impedance of each layer of the enhancement component 300 should be reasonably set to meet the above requirements.

[0042] Optionally, in one embodiment of the present application, adjacent layer surfaces in the reinforcement 300 are tightly fitted and fixedly connected to each other.

[0043] Specifically, adjacent layers in the reinforcement 300 can be arranged to be closely attached to each other and fixedly connected. Preferably, these layers can be solid sheets with a thickness not exceeding 0.2 mm to reduce the attenuation of shock waves. For example, solid materials with different impedances (such as carbon black, aluminum, lead, copper, etc.) can be processed into sheets, arranged in order of increasing impedance, and closely attached and connected together by gluing, welding, etc. to form the reinforcement 300.

[0044] Optionally, in one embodiment of the present application, the impact action surfaces of adjacent layers of the plurality of layers with different impedances have the same area, or the areas decrease sequentially along the action direction of the impact load.

[0045] It can be understood that both sides of the layer body can serve as the input surface or output surface of the shock wave, and the shock wave input surface and / or output surface of the layer body can be collectively referred to as the impact action surface of the layer body.

[0046] In the actual implementation process, the reinforcement 300 can be configured so that the impedance of each layer increases successively along the direction of the impact load, and the area of ​​the impact surface of each layer is the same or the area decreases successively along the direction of the impact load. Whenever the stress wave passes through an interface, the impact load will be amplified, that is, any adjacent layers have a reinforcing effect on the impact load.

[0047] Optionally, in one embodiment of the present application, the impedance of each layer in the layer body is smaller than the impedance of the carrier 100 .

[0048] Specifically, the reinforcement 300 can achieve an enhancement effect on the impact load through its gradient impedance structure. The impedance here refers to the acoustic impedance of the stress wave propagation medium, which is defined as the product of the density of the medium and the wave velocity of the stress wave in the medium, and is an inherent property of the medium. The gradient impedance structure means that the impedance has a gradient (step) change along the direction of the impact load.

[0049] In some embodiments, the reinforcement 300 includes multiple layers with different impedances, and the impedance of each layer increases in sequence along the direction of the impact load to achieve a gradient impedance structure. In addition, the impedance of each layer of the reinforcement 300 should be less than the impedance of the bearing member 100.

[0050] The laser 400 is used to provide laser to the surface of the reinforcement 300 so that the laser generates an impact load on the reinforcement 300, and utilizes multiple layers of different impedances to enhance the impact load to act on the carrier 100 to cause shock waves, so as to simulate real pyrotechnic impact.

[0051] Specifically, the laser 400 in the embodiment of the present application can be used to provide laser light to the surface of the reinforcement 300. The laser 400 can be a common laser generator, including a solid laser, a gas laser, a free electron laser, etc., preferably, a Nd:YAG solid laser, which can generate high-power, narrow-pulse-width laser light, and the energy of the laser light can be regulated.

[0052] The laser acts on the surface of the reinforcement member 300 to generate an impact load, causing an impact response of the reinforcement member 300 .

[0053] Optionally, in one embodiment of the present application, the lateral size of the reinforcement member 300 is equal to or greater than the size of the light spot formed by the laser 400 projected on the reinforcement member 300 .

[0054] For example, the lateral dimension of the reinforcement 300 is slightly larger than the dimension of the light spot formed by laser projection on the reinforcement 300 , that is, the area of ​​the side of the reinforcement 300 facing the laser is larger than the area of ​​the light spot formed by laser projection on the reinforcement 300 .

[0055] Optionally, in one embodiment of the present application, the reinforcement member 300 is arranged so that its center position is consistent with the center position of the light spot projection position or is at least located near the center position of the light spot projection position.

[0056] Specifically, the reinforcement 300 can be arranged so that the light spot formed by the laser projection is located at the center position or near the center position of the reinforcement 300. To this end, the installation position of the reinforcement 300 can be adjusted, and the position of the incident laser of the laser 400 can also be adjusted.

[0057] Optionally, in one embodiment of the present application, it further includes: a constraining layer, which is arranged on a side of the reinforcing member 300 facing the laser 400 .

[0058] In the actual implementation process, the surface of the reinforcement member 300 facing the laser in the embodiment of the present application may be covered with a constraining layer, which may be distilled water or transparent glass, etc. The laser passes through the constraining layer and acts on the reinforcement member 300. The surface of the reinforcement member 300 is ionized under the action of the laser to form plasma, and the plasma absorbs the remaining energy of the laser under the constraint of the constraining layer and expands rapidly to generate high pressure (i.e., generates impact load), so as to achieve high-frequency and high-level instantaneous impact on the reinforcement member 300.

[0059] Optionally, in one embodiment of the present application, it further includes: a water supply member, which provides flowing water to form a constrained layer.

[0060] For example, the device provided in the present application also includes water supply components such as water valves and water pipes, which can provide flowing water to form a constraining layer. Using flowing water as a constraining layer has the advantages of convenient material acquisition and low cost.

[0061] Combine the following Figures 2 to 4 As shown, the working principle of the laser shock load enhancement device 10 of the embodiment of the present application is described in detail with a specific embodiment.

[0062] in, Figure 2 is a schematic structural diagram of a laser shock load enhancement device according to an embodiment of the present application; Figure 3 Schematic diagram of the impact load enhancement process of the laser impact load enhancement device according to an embodiment of the present application; Figure 4 Schematic diagram of the impact load enhancement principle of the laser impact load enhancement device according to an embodiment of the present application.

[0063] like Figure 2 and Figure 3As shown, the present application may include: a load-bearing member 100, a flexible rope 200, a reinforcement member 300, a first layer 310, a first interface 311, a second layer 320, a second interface 321, a third layer 330, a third interface 331, a fourth layer 340, a fourth interface 341, a laser 400, a laser 401, a constraint layer 500, a water supply member 600, a tested member 700, a first sensor 801 and a second sensor 802.

[0064] like Figure 2 and Figure 3 As shown, the reinforcement 300 may have four layers, which are the first layer 310, the second layer 320, the third layer 330 and the fourth layer 340 in the direction of the impact load. There are interfaces between adjacent layers and between the layers and the bearing member 100, the first layer 310 and the second layer 320 have a first interface 311, the second layer 320 and the third layer 330 have a second interface 321, the third layer 330 and the fourth layer 340 have a third interface 331, and the fourth layer 340 and the bearing member 100 have a fourth interface 341. In some other embodiments, the number of layers may not be four, and the embodiment of the present application does not specifically limit the number of layers.

[0065] like Figure 3 and Figure 4 As shown, laser 401 is projected onto the first layer 310 of the reinforcement 300 to generate an impact load, which acts on the first layer 310 and generates a stress wave inside the first layer 310. The stress wave propagates along the thickness direction of the layer. When the stress wave propagates to the first interface 311 between the first layer 310 and the second layer 320, that is, when the stress wave enters the first interface 311, the stress wave is reflected and transmitted. Accordingly, the first interface 311 has an incident wave stress σ I1 , reflected wave stress σ R1 and the transmitted wave stress σ T1 Among them, the incident wave stress σ I1 The magnitude of the laser-induced impact load is equal to the magnitude of the transmitted wave stress σ T1 The magnitude is equal to the incident wave stress σ at the second interface 321 in the second layer 320 I2 size.

[0066] When the stress wave passes through the first interface 311, the stress balance and material velocity conservation equations at the first interface 311 are as follows:

[0067]

[0068] Wherein, A1 and A2 are the areas of the stress action surface (impact action surface) of the first layer 310 and the second layer 320 at the first interface 311, respectively, and vI1 、v R1 and v T1 are respectively the velocities of the particle at the first interface 311 due to the incidence, reflection and transmission of the stress wave.

[0069] When stress waves propagate in a medium, the velocity of particles in the medium and the stress have the following relationship:

[0070]

[0071] Among them, ρ is the density of the medium, c is the stress wave propagation speed (medium sound speed), and:

[0072]

[0073] Among them, E is the elastic modulus of the medium, which is an inherent property of the medium.

[0074] According to the above equation, the stress transfer rate at the first interface 311 can be obtained:

[0075]

[0076] The impedance of a medium is defined as:

[0077]

[0078] We can further get:

[0079]

[0080] The transmitted wave stress at the previous interface is equal to the incident wave stress at the next interface:

[0081] σ I1 =σ T1 ,

[0082] We can get:

[0083]

[0084] Obviously, when A2 / A1+R1 / R2<2, there is σ I2 >σ I1 , when the stress wave passes through the first interface 311, the stress is amplified and the impact load is enhanced.

[0085] As the stress wave propagates, the incidence, reflection and transmission phenomena described above will occur every time the stress wave passes through an interface. Figure 3 As shown, σ I2 , σ I3 and σ I4 are the incident wave stresses at the second interface 321, the third interface 331 and the fourth interface 341, σ R2, σ R3 and σ R4 are the reflected wave stresses at the second interface 321 , the third interface 331 and the fourth interface 341 , respectively.

[0086] Assuming k is an arbitrary positive integer, at the kth interface between the kth layer and the k+1th layer, the stress transfer rate is as follows:

[0087]

[0088] Those skilled in the art can understand that the stress transfer rate is the change ratio of the impact load. When the impact load is enhanced, the above change ratio is the amplification factor of the impact load.

[0089] In some embodiments, the reinforcement 300 can be arranged so that the impedance of each layer increases in sequence along the direction of the impact load, and the impact surface area of ​​each layer is the same, that is, when k is any positive integer, A k+1 =A k And R k+1 >R k , so that σ Ik+1 >σ Ik , whenever the stress wave passes through an interface, the impact load will be amplified, that is, any adjacent layers have an enhancing effect on the impact load.

[0090] Among them, the amplification factor of the impact load of the kth layer and the k+1th layer is:

[0091]

[0092] Furthermore, the magnification factor of the reinforcement member 300 to the impact load can be obtained by multiplying the magnification factor of each pair of adjacent layers in the reinforcement member 300 to the impact load.

[0093] For example, the reinforcement member 300 has four layers, and the amplification factor of the reinforcement member 300 to the impact load is:

[0094]

[0095] In the above embodiment, if the magnitude of the impact load before enhancement is known, that is, σ I1 , the enhanced impact load size can be obtained:

[0096]

[0097] In other embodiments, the reinforcement 300 is configured such that the impedance of each layer increases in sequence along the direction of the impact load, and the area of ​​the impact surface of each layer decreases in sequence along the direction of the impact load, that is, when k is any positive integer, A k+1 k ​And R k+1 >R k , so that σ Ik+1 >σ Ik , any adjacent layers have a reinforcing effect on the impact load.

[0098] In some embodiments, the number of layers and impedance of the layers in the reinforcement member 300 are determined by the desired enhancement effect on the impact load. Specifically, the user of the laser impact load enhancement device has a certain understanding of the magnitude of the real pyrotechnic impact load and can know the magnitude of the impact load caused by the laser 400. Then the user's demand is to enhance the impact load to a level close to the real pyrotechnic impact load, and the number of layers and impedance of each layer of the reinforcement member 300 should be reasonably set to meet the above demand.

[0099] like Figure 2 As shown, in some embodiments, the laser shock load enhancement device provided in the embodiments of the present application may further include a first sensor 801, and the first sensor 801 is configured to obtain the impact response parameters of the bearing member 100 when the impact load is applied. The number of the first sensors 801 may be one or more. The type of the first sensor 801 may be one or more, and its optional types include but are not limited to acceleration sensors, laser Doppler velocimeters, etc. The first sensor 801 may be installed on the other side of the bearing member 100 opposite to the enhancement member 300, or may be installed on the side where the enhancement member 300 is located, or may not be installed on the bearing member 100, as long as the impact response parameters of the bearing member 100 when the impact load is applied can be obtained.

[0100] The laser shock load enhancement device provided in the present application can be used to test the pyrotechnic impact resistance of the tested piece 700, which can be a precision aerospace component or other device that needs to be tested for pyrotechnic impact resistance. The tested piece 700 is arranged to be located on the other side of the carrier 100 opposite to the reinforcement member 300, and can be fixed to the carrier 100 by bonding, adsorption, etc.

[0101] like Figure 2 As shown, in some embodiments, the laser shock load enhancement device provided by the present application further includes a second sensor 802, and the second sensor 802 is configured to obtain shock response parameters of the test piece 700 when the shock load is applied. The number of second sensors 802 may be one or more. The type of the second sensor 802 may be one or more, and its optional types include but are not limited to acceleration sensors, laser Doppler velocimeters, etc. The second sensor 802 may be installed on the test piece 700, or may be installed on the support member 100 at a position close to the test piece 700, as long as the shock response parameters of the support member 100 when the shock load is applied can be obtained.

[0102] In addition, it is worth noting that when the first sensor 801 or the second sensor 802 is a laser Doppler velocimeter, the installation position thereof may be far away from the carrier 100 .

[0103] According to the laser shock load enhancement device proposed in the embodiment of the present application, the shock load can be enhanced based on the reinforcement member, and the enhancement effect can be estimated, so that the pyrotechnic shock simulated by the laser excitation method is closer to the actual pyrotechnic shock response magnitude, and the pyrotechnic shock simulation effect is improved. As a result, the problem that the magnitude of the shock load generated by the laser excitation simulation method is small due to the influence of the laser power density, laser wavelength, pulse width and other parameters of the laser generator in the related art is improved.

[0104] Next, a method for estimating the impact load enhancement effect proposed in an embodiment of the present application is described with reference to the accompanying drawings.

[0105] Figure 5 It is a flow chart of a method for estimating impact load enhancement effect according to an embodiment of the present application.

[0106] like Figure 5 As shown, the method for estimating the impact load enhancement effect includes the following steps:

[0107] In step S501, the impact load reinforcement effect of each adjacent layer in the reinforcement is determined.

[0108] Optionally, in one embodiment of the present application, the reinforcement effect of each pair of adjacent layers in the layer body is the first magnification multiple of the impact load of each pair of adjacent layers in the layer body.

[0109] Optionally, in one embodiment of the present application, the calculation formula of the first magnification is:

[0110]

[0111] Among them, Am is the first magnification, A k and A k+1 are the impact surface areas of the kth and k+1th layers in the layer body, R k and R k+1 are the impedances of the kth layer and the k+1th layer in the layer body respectively.

[0112] In step S502, the reinforcing effect of each adjacent layer in the reinforcing member on the impact load is accumulated to obtain the reinforcing effect of the entire reinforcing member on the impact load.

[0113] Optionally, in one embodiment of the present application, the reinforcing effect of the reinforcement on the impact load is a second magnification factor of the reinforcement on the impact load, wherein the second magnification factor is obtained by multiplying the first magnification factor of the impact load of each pair of adjacent layers in the layer body of the reinforcement.

[0114] Optionally, in one embodiment of the present application, it also includes: determining the size of the impact load acting on the reinforcement; multiplying the size of the impact load by the second magnification factor of the reinforcement on the impact load to obtain the size of the enhanced impact load.

[0115] It should be noted that the above explanation of the embodiment of the laser shock load enhancement device is also applicable to the estimation method of the shock load enhancement effect of this embodiment, which will not be repeated here.

[0116] According to the estimation method of the impact load enhancement effect proposed in the embodiment of the present application, the impact load can be enhanced based on the reinforcement member, and the enhancement effect can be estimated, so that the pyrotechnic impact simulated by the laser excitation method is closer to the actual pyrotechnic impact response magnitude, and the pyrotechnic impact simulation result is improved. As a result, the problem in the related art that the magnitude of the impact load generated by the laser excitation simulation method is small due to the influence of the laser power density, laser wavelength, pulse width and other parameters of the laser generator is improved.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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 laser shock load enhancement device, characterized in that: include: bearing member; A flexible cable, wherein the flexible cable is connected to the load-bearing member so that the load-bearing member is in a suspended state; A reinforcement member, the reinforcement member is fixedly arranged on one side of the bearing member, the reinforcement member comprises multiple layers with different impedances, and the impedance of each layer increases sequentially along the direction of action of the impact load; and A laser is used to provide laser light to the surface of the reinforcement, and the laser generates the impact load on the reinforcement. The impact load realizes load enhancement under the action of the multiple layers of different impedances and causes a vibration response on the bearing member to achieve a simulation of a real pyrotechnic impact.

2. The laser shock load enhancement device according to claim 1, characterized in that: The number of layers and the impedance of the multi-layer body with different impedances are obtained by the target reinforcement effect of the impact load.

3. The laser shock load enhancement device according to claim 1, characterized in that: The surfaces of adjacent layers in the reinforcement are tightly fitted and firmly connected to each other.

4. The laser shock load enhancement device according to claim 1 or 3, characterized in that: The impact action surfaces of adjacent layers of the plurality of layers with different impedances have the same area, or the areas decrease sequentially along the action direction of the impact load.

5. The laser shock load enhancement device according to claim 1, characterized in that: The impedance of each layer in the layer body is smaller than the impedance of the carrier.

6. The laser shock load enhancement device according to claim 1, characterized in that: The lateral dimension of the reinforcement is equal to or greater than the dimension of the light spot formed by the laser projecting onto the reinforcement.

7. The laser shock load enhancement device according to claim 6, characterized in that: The reinforcing member is arranged so that its center position is consistent with the center position of the light spot projection position or is at least located near the center position of the light spot projection position.

8. The laser shock load enhancement device according to claim 1, characterized in that: Also includes: A constraining layer is arranged on a side of the reinforcing member facing the laser.

9. The laser shock load enhancement device according to claim 8, characterized in that: Also includes: A water supply member is provided to provide flowing water to form the constraining layer.

10. A method for estimating the impact load enhancement effect, characterized in that: The laser shock load enhancement device according to any one of claims 1 to 9 is used, wherein the method comprises the following steps: In the case of causing a shock wave acting on the bearing member, determining the reinforcing effect of each pair of adjacent layers in the layer body on the impact load; The reinforcing effect of each pair of adjacent layers in the layer bodies on the impact load is accumulated to obtain the reinforcing effect of the reinforcing member on the impact load.

11. The method for estimating the impact load enhancement effect according to claim 10, characterized in that: The reinforcing effect of each pair of adjacent layers in the layer body is a first magnification factor of each pair of adjacent layers in the layer body to the impact load.

12. The method for estimating the impact load enhancement effect according to claim 11, characterized in that: The calculation formula of the first magnification is: Wherein, Am is the first magnification, A k and A k+1 are the impact surfaces of the kth layer and the k+1th layer in the layer body, R k and R k+1 are the impedances of the kth layer and the k+1th layer in the layer body respectively.

13. The method for estimating the impact load enhancement effect according to claim 11 or 12, characterized in that: The reinforcing effect of the reinforcement on the impact load is a second magnification factor of the reinforcement on the impact load, wherein the second magnification factor is obtained by multiplying the first magnification factors of each pair of adjacent layers in the layers of the reinforcement on the impact load.

14. The method for estimating the impact load enhancement effect according to claim 10, characterized in that: Also includes: determining the magnitude of the impact load acting on the reinforcement; The magnitude of the impact load is multiplied by the second magnification factor of the impact load exerted by the reinforcement member to obtain the magnitude of the impact load after enhancement.

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