CN117516852A - Initiating explosive device impact simulation device, testing method and estimation method - Google Patents
Initiating explosive device impact simulation device, testing method and estimation method Download PDFInfo
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- CN117516852A CN117516852A CN202311294233.2A CN202311294233A CN117516852A CN 117516852 A CN117516852 A CN 117516852A CN 202311294233 A CN202311294233 A CN 202311294233A CN 117516852 A CN117516852 A CN 117516852A
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- 230000000977 initiatory effect Effects 0.000 title claims abstract description 79
- 239000002360 explosive Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000004088 simulation Methods 0.000 title claims abstract description 51
- 238000012360 testing method Methods 0.000 title abstract description 22
- 238000009863 impact test Methods 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims description 20
- 230000001965 increasing effect Effects 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 230000035939 shock Effects 0.000 claims description 12
- 230000001133 acceleration Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims 1
- 230000008569 process Effects 0.000 description 16
- 210000002381 plasma Anatomy 0.000 description 13
- 238000010586 diagram Methods 0.000 description 11
- 230000004044 response Effects 0.000 description 11
- 230000005855 radiation Effects 0.000 description 7
- 238000003754 machining Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 230000002708 enhancing effect Effects 0.000 description 4
- 230000037452 priming Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 2
- 239000005304 optical glass Substances 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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Abstract
The application relates to a initiating explosive device impact simulation device, a testing method and an estimating method, wherein the device comprises: a carrier; the flexible rope is connected with the bearing piece so as to enable the bearing piece to be in a hanging state; the laser is used for generating laser and generating impact load on the side of the bearing piece facing the laser; the constraint layer is arranged on one side of the bearing piece facing the laser so as to increase the impact load of the laser on the bearing piece; wherein, the bearing part is formed with a plurality of holes towards one side of the laser, can increase the impact load of laser to the bearing part. This application can be through setting up a plurality of taper holes at the surface of carrier for laser takes place multiple reflection in the aperture is inside, and then increases the impact load of laser to the carrier. Therefore, according to the device provided by the application, the real fire impact environment can be better simulated and used for conducting fire impact tests.
Description
Technical Field
The application relates to the technical field of impact testing, in particular to a fire engineering impact simulation device, a testing method and an estimation method.
Background
The fire separation device is widely applied to the working process of key spacecrafts such as multistage rocket separation, component expansion, component release and the like due to the characteristics of high reliability, convenient use, mature process and the like. In order to improve the success rate of aerospace flight tasks, the real fire impact load is often required to be simulated in a ground environment so as to test the fire impact resistance of spacecraft components.
In the related art, a large amount of dense high-temperature and high-pressure plasmas are generated by utilizing laser with high power density and short pulse to act on the surface of a material, the plasmas absorb laser energy to expand, high-strength impact load is formed, and the initiating explosive device impact can be simulated to a certain extent.
However, in the related art, the magnitude of the impact load generated by the laser impact simulation method depends on laser parameters such as laser power density, laser wavelength, pulse width and the like to a large extent, so that high requirements are put on test equipment, and the wide use of the laser impact simulation method is restricted.
Disclosure of Invention
The application provides a device for simulating the impact of a fire machine, a testing method and an estimating method, which are used for solving the problems that in the related art, when the laser impact simulation method is adopted to simulate the impact of the fire machine, the magnitude of impact load generated by laser depends on laser parameters such as laser power density, laser wavelength, pulse width and the like to a great extent, the requirement of test equipment is high, the simulation of the real impact environment of the fire machine cannot be fully realized in the impact strength and the like.
An embodiment of a first aspect of the present application provides an initiating explosive device comprising: a carrier; the flexible rope is connected with the bearing piece so as to enable the bearing piece to be in a hanging state; a laser for generating laser light and generating an impact load on a side of the carrier facing the laser light; the constraint layer is arranged on one side of the bearing piece facing the laser so as to increase the impact load of the laser on the bearing piece; wherein, the bearing part is provided with a plurality of holes on one side facing the laser, so that the impact load of the laser on the bearing part can be increased.
Optionally, in one embodiment of the present application, the hole is a tapered hole.
Optionally, in one embodiment of the present application, the taper inclination of the taper hole is greater than 30 ° and less than 45 °.
Optionally, in one embodiment of the present application, the profile and the size of the distribution area of the plurality of holes are determined by the profile and the size of a laser spot projected by the laser on the carrier.
Optionally, in an embodiment of the present application, the profile of the distribution area is the same as the profile of the laser spot.
Optionally, in one embodiment of the present application, the size of the plurality of hole distribution areas is equal to or larger than the size of the laser spot.
Alternatively, in one embodiment of the present application, the hole distribution of the plurality of holes may form a plurality of concentric circles.
Optionally, in one embodiment of the present application, the constraining layer is a flowing water constraining layer.
An embodiment of a second aspect of the present application provides a method for testing an initiating explosive device, including: fixing the component to be tested on the side, facing away from the laser, of the bearing piece; loading an acceleration sensor on the bearing piece and arranging the acceleration sensor to be near the component to be tested; vertically projecting the laser to the bearing piece, and enabling the projection position of the laser to be consistent with the distribution area of the holes; collecting data information detected by the acceleration sensor, serving as a fire impact environment born by the component to be tested, comparing the data information with a preset fire impact environment, and if the data information meets the preset precision requirement, meeting the fire impact simulation requirement according to the current working condition; and if the preset precision requirement is not met, adjusting the laser energy density until the preset precision requirement is met.
Optionally, in one embodiment of the present application, further includes: and adjusting the impact gap time of the laser so as to enable the subsequent laser to continuously apply pulse laser on the basis of incomplete cooling of the material, thereby increasing the impact magnitude of the laser.
Optionally, in one embodiment of the present application, the impingement gap time is at least less than 1.5 times the incident laser pulse width.
An embodiment of a third aspect of the present application provides a method for estimating an impact reinforcement effect of an initiating explosive device impact simulation apparatus, including: establishing a finite element model of the initiating explosive device impact simulation device; setting a normally incident laser ray beam above the hole of the finite element model; after the ray beam is injected into the hole, determining the incidence point and the incidence angle of the laser after any reflection times; determining the incident light intensity of the laser beam after any reflection times according to the incident point and the incident angle; determining the impact load generated by the laser according to the incident light intensity of any incident light; superposing all incident laser beam impact loads under the same measuring point to determine a first laser impact load after repeated reflection enhancement; according to the initiating explosive device impact simulation device, a flat plate model without holes is established, the same laser is arranged at the same position, and a second laser impact load generated by the laser is determined; and comparing the first laser shock load with the second laser shock load to determine a shock enhancement effect.
Alternatively, in one embodiment of the present application, the peak of the laser beam impact load is determined by the following expression:
wherein Z is the impedance at the metal-water interface; the ratio of the energy of the absorbed laser energy molecules is about 0.1 to 0.3; i αi I is the number of reflections for the intensity of the absorbed incident light.
According to the method and the device for simulating the impact of the initiating explosive device, the impact load of the laser on the bearing piece can be increased, the actual initiating explosive device impact environment can be effectively simulated, the response of the component to be tested to the initiating explosive device impact can be obtained, and the enhancement effect of the initiating explosive device impact simulation device to the laser impact can be estimated simply, conveniently and effectively. Therefore, the problems that in the related art, when a laser impact simulation method is adopted to simulate the impact of a fire work, the magnitude of impact load generated by laser depends on laser parameters such as laser power density, laser wavelength, pulse width and the like to a large extent, the requirement of test equipment is high, the simulation of the real impact environment of the fire work cannot be fully realized in the impact strength and the like are solved.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a device for simulating an impact of an initiating explosive device according to an embodiment of the present application;
FIG. 2 is a schematic structural view of an initiating explosive device impact simulator according to an embodiment of the present application;
FIG. 3 is a schematic structural view of a carrier according to an embodiment of the present application;
FIG. 4 is a schematic diagram of the aperture versus impact load enhancement principle according to an embodiment of the present application;
FIG. 5 is a diagram illustrating the relationship between the aperture distribution and the laser spot according to an embodiment of the present application;
FIG. 6 is a schematic diagram of the working principle of the initiating explosive device impact simulation device for initiating explosive device impact test according to the embodiment of the application;
FIG. 7 is a schematic diagram of the working principle of an initiating explosive device impact simulation device for estimating impact reinforcement effect according to an embodiment of the present application;
FIG. 8 is a flow chart of a method of initiating explosive device impact testing according to an embodiment of the present application;
fig. 9 is a flowchart of a method for estimating an impact reinforcement effect of an initiating explosive device impact simulation device according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
The initiating explosive device impact simulation device, the testing method and the estimation method of the embodiment of the application are described below with reference to the drawings, and the problems that in the related art, when the initiating explosive device impact is simulated by adopting a laser impact simulation method, the magnitude of impact load generated by laser depends on laser parameters such as laser power density, laser wavelength, pulse width and the like to a large extent, the requirement of test equipment is high, and simulation of a real initiating explosive device impact environment cannot be fully realized in the impact strength are solved. The utility model provides a fire work impact simulation device, the device can be through increasing the impact load of laser to the carrier to simulate true fire work impact characteristic better, and realize the simple and convenient, the effective, the quick estimation of fire work impact simulation device laser impact reinforcing effect through impact response reinforcing effect prediction method.
Specifically, fig. 1 is a schematic diagram of the composition of an initiating explosive device impact simulation device according to an embodiment of the present application.
As shown in fig. 1, the initiating explosive device impact simulation apparatus 10 includes: carrier 100, flexible cable 200, laser 300, and constraining layer 400.
Specifically, the flexible cable 200 is connected to the carrier 100 so that the carrier 100 is suspended.
The laser 300 is used for generating laser light and generating impact load on the laser facing side of the carrier 100.
The side of the carrier 100 facing the laser 300 is formed with a plurality of holes to increase the impact load of the laser on the carrier 100.
In the actual implementation process, a plurality of holes may be formed on the side of the carrier 100 facing the laser 300, and geometric constraint is added to the plasma through the hole wall to limit the expansion of the plasma, so that the plasma transfers more momentum to the carrier 100 in the expansion process, and the impact load of the laser on the carrier 100 can be further increased.
Alternatively, in one embodiment of the present application, the hole is a tapered hole.
Specifically, the hole in the embodiment of the present application may be a taper hole. In some embodiments, the holes may also be cylindrical holes or other hole-shaped structures.
Alternatively, in one embodiment of the present application, the taper angle of the taper hole is greater than 30 ° and less than 45 °.
For example, within a plurality of holes, the laser light may be reflected multiple times within each hole, thereby improving the energy utilization of the laser light. The inclination angle of the taper hole is the included angle between the wall surface of the hole and the plumb line, and is marked as theta. When the laser acts perpendicularly on the surface of the carrier 100, it can be considered that the laser is perpendicularly incident, and the angle between the incident laser and the wall surface is also θ, and the angle between the reflected laser and the wall surface is 3θ. When theta is less than 45 degrees, the secondary incidence of laser can be realized, when theta is less than 30 degrees, the tertiary incidence of laser can be realized, and the energy utilization rate of laser can be further improved through repeated incidence of laser. In some embodiments, the taper hole inclination angle of the taper hole may be set to be greater than 30 ° and less than 45 ° in consideration of the difficulty of actual machining, so as to reduce the difficulty of actual machining on the premise of effectively improving the laser energy utilization rate and thus effectively increasing the impact load.
Optionally, in one embodiment of the present application, the profile and size of the distribution area of the plurality of holes is determined by the profile and size of the laser spot projected by the laser on the carrier 100.
In the actual implementation process, the profile and the size of the distribution area of the plurality of holes can be determined according to the profile and the size of the laser spot projected by the laser on the carrier 100, so that the impact load of the laser can be amplified by using the holes better.
Optionally, in an embodiment of the present application, the profile of the distribution area is the same as the shape of the laser spot.
In particular, the profile of the distribution area of the holes may be the same as the profile of the laser spot to make full use of each hole. In some embodiments, if the laser spot profile is circular, the aperture distribution area is circular. In some embodiments, if the laser spot profile is rectangular, the aperture distribution area is rectangular.
Optionally, in one embodiment of the present application, the size of the plurality of hole distribution areas is equal to or larger than the size of the laser spot.
For example, in some embodiments, the size of the distribution area of the plurality of holes is equal to or slightly larger than the size of the laser spot, such that each hole can absorb laser energy. In some embodiments, the size of the distribution area of the holes may be slightly smaller than the size of the laser spot when considering the actual machining cost and machining difficulty.
Alternatively, in one embodiment of the present application, the hole distribution of the plurality of holes may form a plurality of concentric circles.
In an actual implementation process, the plurality of holes in the embodiment of the application may be distributed to form a plurality of groups of concentric circles. Further, in some embodiments, the holes may also be distributed in other regular arrays.
The confinement layer 400 is disposed on a side of the carrier 100 facing the laser 300, so as to increase an impact load of the laser on the carrier 100.
For example, the confinement layer 400 may be disposed on the side of the carrier 100 facing the laser 300, and the plasma generated by the laser striking the carrier 100 is confined on the surface of the carrier 100, so that more momentum is transferred to the carrier 100 during the expansion of the plasma, thereby increasing the magnitude of the striking load and the striking time.
Alternatively, in one embodiment of the present application, the constraint layer 400 is a flowing water constraint layer.
Specifically, the restriction layer 400 may be a flowing water restriction layer, which may be supplied with water by a water supply member or by other means. In some embodiments, confinement layer 400 may also be other structures, such as an optical glass confinement layer or an organic material confinement layer.
The initiating explosive device 10 of the present embodiment is described in detail below with reference to fig. 2 to 5 in one specific embodiment.
The specific structure of the embodiment of the application is shown in fig. 2 to 5, and includes: carrier 100, cone hole 110, cone hole inclination 111, incident laser angle 112, reflected laser angle 113, flex cable 200, laser 300, laser 301, spot 301, constraining layer 400, component 500 to be tested, and sensor 600.
As shown in fig. 2, fig. 2 is a schematic structural diagram of an initiating explosive device impact simulation device according to an embodiment of the present application, where a confinement layer 400 may be disposed on a side of a carrier 100 facing a laser 300, and a plasma generated by impacting the carrier 100 with a laser 301 is confined on a surface of the carrier 100, so that more momentum is transferred to the carrier 100 during a plasma expanding process, thereby increasing an impact load magnitude and an impact time. Wherein, a plurality of holes 110 are formed on the side of the carrier 100 facing the laser 300, and the hole wall is used for adding geometric constraint to the plasma to limit the expansion of the plasma, so that the plasma transfers more momentum to the carrier 100 in the expansion process, thereby further increasing the impact load of the laser 301 on the carrier 100.
As shown in fig. 3, fig. 3 is a schematic structural diagram of a carrier according to an embodiment of the present application, and the hole 110 may be a tapered hole. In some embodiments, the aperture 110 may also be a cylindrical aperture or other aperture-shaped structure.
Further, as shown in fig. 2 to 4, the laser 301 is reflected multiple times within each hole 110 inside the plurality of holes 110, whereby the energy utilization efficiency of the laser 301 can be improved. Fig. 4 is a schematic diagram of the principle of enhancing impact load by using small holes according to an embodiment of the present application, where the taper hole inclination 111 is the angle between the wall surface of the hole 110 and the plumb line, and is denoted as θ. When the laser 301 acts perpendicularly on the surface of the carrier 100, it can be considered that the laser 301 is perpendicularly incident, and the incident laser included angle 112 between the incident laser and the wall surface is also θ, and the reflected laser included angle 113 between the reflected laser and the wall surface is 3 θ. Referring to fig. 4, when θ < 45 °, secondary incidence of the laser 301 may be achieved, and when θ < 30 °, tertiary incidence of the laser 301 may be achieved, and multiple laser incidence may further improve the energy utilization of the laser 301. In some embodiments, the taper angle 111 of the taper 110 may be set to be greater than 30 ° and less than 45 ° in consideration of the difficulty of actual machining, so as to reduce the difficulty of actual machining on the premise of effectively improving the laser energy utilization rate and thus effectively increasing the impact load.
In some embodiments, the profile and size of the distribution area of the aperture 110 is determined from the laser spot 302 projected by the laser 301 on the carrier 100, thereby better utilizing the aperture 110 to amplify the impact load of the laser 301.
In some embodiments, the profile of the distribution area of the holes 110 is the same as the profile of the laser spot 302 to fully utilize each hole 110. In some embodiments, the laser spot 302 is circular in profile, and the aperture 110 distribution area is circular. In some embodiments, the laser spot 302 is rectangular in outline, and then the aperture 110 distribution area is rectangular.
Preferably, as shown in fig. 5, where fig. 5 is a plot of aperture distribution versus laser spot according to an embodiment of the present application, in some embodiments, the size of the distribution area of apertures 110 is equal to or slightly larger than the size of laser spot 302, such that each aperture 110 can absorb laser energy. In some embodiments, the size of the distribution area of the aperture 110 may be slightly smaller than the size of the laser spot 302 when considering the actual processing costs and processing difficulties.
Further, as shown in fig. 5, in some embodiments, the holes 110 may be distributed to form multiple sets of concentric circles. In other embodiments, the apertures 110 may be distributed in other regular arrays.
In some embodiments, an increase in the outer diameter of the single aperture 110 will increase the thickness of the carrier 100, thereby increasing the thickness of the carrier 100, reducing the impact response. The outer diameter of the holes 110 may be made as small as practical processing conditions allow, and the number as large as possible to increase the laser shock response.
The embodiment of the application can be provided with the hole 110, so that the magnitude of the impact load amplitude of the laser 301 is effectively improved by a geometric constraint method, and the simulation of the real initiating explosive device impact environment is realized. And by arranging the holes 110 in an array, the carrier 100 has a thinner geometric thickness, further improving the magnitude of the laser shock load.
In some embodiments, confinement layer 400 may be configured to reflect and absorb laser light 301 less. In some embodiments, the constraining layer 400 may be a flowing water constraining layer that may be supplied by a water supply or by other means. In some embodiments, confinement layer 400 may also be other structures, such as an optical glass confinement layer or an organic material confinement layer.
Further, referring to fig. 6, fig. 6 is a schematic diagram illustrating an operating principle of a priming device for performing a priming device impact test according to an embodiment of the present application, when the priming device 10 of the embodiment of the present application performs a priming device impact test on a component to be tested, the method may include the following steps:
step S601: the impacted member is loaded on the carrier.
Specifically, the component 500 to be tested may be fixed on the side of the carrier 100 facing away from the incident laser 301.
Step S602: the sensor is loaded on the carrier and configured to be in proximity to the test piece to be tested.
In an actual implementation process, the sensor 600 may be fixed on the side of the carrier 100 facing away from the laser 301 in a manner of adhesion, screwing, or the like, and disposed near the component 500 to be tested.
Step S603: the laser is directed to the center of the distribution area of the holes on the carrier, and then pulsed laser light is emitted.
Specifically, the embodiment of the present application may vertically project the laser 301 onto the carrier 100, and make the projection position thereof consistent with the distribution area of the taper holes 110.
Step S604: data information monitored by the sensor is recorded.
Specifically, the embodiment of the present application may record the data information detected by the sensor 600, which is used as a record of the state change condition of the component 500 to be tested in the process of the carrier 100 being impacted by the laser 301. The data information detected by the acceleration sensor 600 can be collected to serve as the initiating explosive device impact environment borne by the component 500 to be tested, and compared with a preset initiating explosive device impact environment, if the amplitude requirement is met, the requirement of the initiating explosive device impact simulation strength is met according to the current working condition; if the amplitude requirement is not met, the energy density of the laser 301 is adjusted until the intensity requirement is met.
As shown in fig. 2, in some embodiments, the component 500 to be tested is disposed on a side of the carrier 100 facing away from the laser 301 and near the location of incidence of the laser 301 to obtain a higher magnitude of impact response. In some embodiments, the component 500 to be tested may be disposed at other positions of the carrier 100 according to the test requirements.
Further, the sensor 600 in the embodiment of the present application may be disposed near the component 500 to be tested to obtain data such as vibration response very close to the component 500 to be tested, so as to record the state change condition of the component 500 to be tested in the process that the carrier 100 is impacted by the laser 301. In some embodiments, the sensor 600 may be an acceleration sensor to obtain impact loads to which the component under test is subjected. In some embodiments, the sensor 600 may select other sensors according to the test requirements, and may also change the position of the sensor 600 on the carrier 100 according to the test requirements.
In some embodiments, it is at least desirable that the laser spot 302 be projected near the center of the distribution area of the aperture 110 when the center of the distribution area of the aperture 110 is not centered at the laser spot 302 due to test conditions or device settings, etc. In some embodiments, a mirror or the like may also be used to adjust the position of incidence of the laser 301.
In some embodiments, the carrier 100 may be impacted using a pulsed laser, with the impact gap time of the laser 301 adjusted. In some embodiments, the impingement gap time of the laser 301 may be set to be at least 1.5 times less than the incident laser pulse width so that subsequent lasers continue to impinge on the carrier 100 surface material without completely cooling the carrier 100 surface material to increase the recoil pressure acting on the carrier 100 surface material.
Further, referring to fig. 7, fig. 7 is a schematic diagram illustrating an operating principle of the initiating explosive device impact simulation device according to an embodiment of the present application for estimating an impact enhancing effect, the initiating explosive device impact simulation device 10 according to an embodiment of the present application may include the following steps when estimating the impact enhancing effect:
step S701: the initiating explosive device impact simulator 10 is modeled.
Specifically, embodiments of the present application may build finite element models based on the actual configuration of the initiating explosive device impact simulator 10.
Step S702: an incident radiation beam is positioned over the tapered bore and an initial percussion pressure peak of the incident radiation beam is determined.
For example, embodiments of the present application may place an incident laser beam above the finite element model of the initiating explosive device 10, with the incident laser beam being perpendicular to the plate.
Step S703: after the radiation beam enters the tapered hole, the initial incident point and the incident angle of the incident light are determined.
Step S704: and determining the reflected light intensity after the incident light is reflected for multiple times according to the initial incident point and the incident angle of the incident light.
Step S705: and determining the impact pressure crest generated by the laser during the secondary reflection according to the intensity of the reflected light after the incident light is reflected at any time.
In the actual implementation process, the embodiment of the application can determine the impact load generated by the laser according to the incident light intensity of any incident light.
Step S706: and determining the total impact response peak value of the laser beam after multiple reflections according to the peak value of the incident light.
Specifically, the embodiment of the application can accumulate all the impact loads of the incident laser beams at the same measuring point to determine the enhanced laser impact load.
Step S707: the impact enhancement effect is determined based on a comparison of the peak of the laser impact at multiple incidence and the peak of the laser impact response without multiple reflection.
For example, according to the actual structure of the initiating explosive device impact simulation device 10, the embodiment of the present application can build a flat plate model without holes, set the same laser at the same position in step S702, and determine the impact load generated by the laser beam.
In the actual implementation process, the embodiment of the application can compare the laser impact load after multiple reflection with the laser impact load without multiple reflection in the step S707, so as to determine the impact enhancement effect.
In some embodiments, in step S701, only the carrier portion of the initiating explosive device impact simulation apparatus 10 may be considered in the modeling. Specifically, in some embodiments, modeling may be performed according to an actual structure and an actual material of the carrier, where a finite element model may be selectively built during modeling, or other types of models may be built according to actual needs.
In step S702, the radiation beam may be disposed directly above the taper hole of the device model created in step S701, and vertically incident to the inside of the taper hole. In some embodiments employing finite element models, the radiation beam may be split into 30-50 fractions for analysis, or may be analyzed in other ways depending on the actual requirements.
In step S703, the embodiment of the present application may track and record the incident position, the incident angle, and the incident intensity of each incident of the radiation beam by the ray tracing method.
In some embodiments, in step S704, the relationship between the incident light intensity and the reflected light intensity may be approximately expressed by the following equation:
I i+1 ＝RI i ，
wherein I is i Is the intensity of incident light; i i+1 The reflected light intensity is also the incident light intensity at the next incidence; r is the reflection coefficient at the metal-water interface. It is noted that the absorption of the laser by the plasma itself is omitted here to simplify the calculation process.
In some embodiments, the reflectance at the metal-water interface may be determined using the following equation:
wherein R is s Is the reflection coefficient of the S wave; r is R p Is the reflection coefficient of the P wave; θ i Is the incident angle; θ t Is the transmission angle; n is n i Is the refractive index of the environment medium; n is n t Is a metal refractive index; k (k) t Is the absorption coefficient of metal.
In some embodiments, the impact load of each incident laser light may be superimposed according to the angle and the incident position of the incident laser light reflected multiple times to estimate the impact enhancement effect. Specifically, in some embodiments, the peak of the impact load for multiple reflections may be represented by the following equation:
P＝∑P i ，
wherein P is the peak of the incident light after multiple reflections; p (P) i Is the peak of the incident light at the ith incidence.
In step S707, the embodiment of the present application may select a comparison peak to compare the impact enhancement effect with respect to the impact load of the laser light after multiple reflections and the impact load of the laser light without multiple reflections.
In step S705, the embodiment of the present application may simplify the incident light of each incidence to a triangular wave. Specifically, in some embodiments, the impact load of incident light may be reduced to an isosceles triangle wave having a duration twice the pulse width of the incident laser light, and the peak of the impact load of incident light at any one time may be represented by the following formula:
wherein Z is the impedance at the metal-water interface; the ratio of the energy of the absorbed laser energy molecules is about 0.1 to 0.3; i αo Intensity of incident light absorbed for the metal; i is the number of reflections. Wherein I is αi Expression of (2)The method comprises the following steps:
I αi ＝(1-R)I i ，
wherein I is i Is the intensity of incident light; r is the reflection coefficient at the metal-water interface; o (O) αi The intensity of incident light absorbed by the metal.
According to the initiating explosive device impact simulation device provided by the embodiment of the application, the impact load of laser to the bearing piece can be increased, the actual initiating explosive device impact environment can be effectively simulated, the response of the component to be tested to the initiating explosive device impact can be obtained, and the enhancement effect of the initiating explosive device impact simulation device to the laser impact can be estimated simply, conveniently, effectively and rapidly. Therefore, the problems that in the related art, when a laser impact simulation method is adopted to simulate the impact of a fire work, the magnitude of impact load generated by laser depends on laser parameters such as laser power density, laser wavelength, pulse width and the like to a large extent, the requirement of test equipment is high, the simulation of the real impact environment of the fire work cannot be fully realized in the impact strength and the like are solved.
The initiating explosive device impact testing method according to the embodiment of the application is described with reference to the accompanying drawings.
Fig. 8 is a flowchart of a method of initiating explosive device impact testing according to an embodiment of the present application.
As shown in fig. 8, the initiating explosive device impact test method comprises the following steps:
in step S801, the component to be tested is fixed on the side of the carrier opposite to the laser.
In step S802, an acceleration sensor is loaded on the carrier and disposed in the vicinity of the component to be tested.
In step S803, the laser light is vertically projected onto the carrier, and the projection position thereof is made to coincide with the distribution area of the plurality of holes.
In step S804, the data information detected by the acceleration sensor is collected and used as the initiating explosive device impact environment born by the component to be tested, and compared with the predetermined initiating explosive device impact environment, if the predetermined precision requirement is met, the initiating explosive device impact simulation requirement is met according to the current working condition.
In step S805, if the preset accuracy requirement is not met, the laser energy density is adjusted until the preset accuracy requirement is met.
Optionally, in one embodiment of the present application, the initiating explosive device impact testing method further comprises: the laser impact gap time is adjusted so that the pulse laser is continuously applied to the subsequent laser on the basis that the material is not completely cooled, and the laser impact magnitude is increased.
Optionally, in one embodiment of the present application, the impingement gap time is at least less than 1.5 times the incident laser pulse width.
It should be noted that the foregoing explanation of the embodiments of the initiating explosive device impact simulation apparatus is also applicable to the initiating explosive device impact testing method of the embodiments, and will not be repeated herein.
According to the method for testing the initiating explosive device impact provided by the embodiment of the application, the impact load of the laser to the bearing piece can be increased, the real initiating explosive device impact environment can be effectively simulated, the response of the component to be tested to the initiating explosive device impact can be obtained, and the enhancement effect of the initiating explosive device impact simulation device to the laser impact can be estimated simply, conveniently, effectively and rapidly. Therefore, the problems that in the related art, when a laser impact simulation method is adopted to simulate the impact of a fire work, the magnitude of impact load generated by laser depends on laser parameters such as laser power density, laser wavelength, pulse width and the like to a large extent, the requirement of test equipment is high, the simulation of the real impact environment of the fire work cannot be fully realized in the impact strength and the like are solved.
Next, a method for estimating an impact reinforcement effect of an initiating explosive device according to an embodiment of the present application will be described with reference to the accompanying drawings.
Fig. 9 is a flowchart of a method for estimating an impact reinforcement effect of an initiating explosive device impact simulation device according to an embodiment of the present application.
As shown in fig. 9, the method for estimating the impact reinforcement effect of the initiating explosive device comprises the steps of:
in step S901, a finite element model of the initiating explosive device impact simulation apparatus is established.
In step S902, a normally incident laser ray beam is set above the hole of the finite element model.
In step S903, after the radiation beam is incident on the hole, the incidence point and incidence angle of the laser light after any number of reflections are determined.
In step S904, the incident light intensity of the laser beam after any number of reflections is determined according to the incident point and the incident angle.
In step S905, the impact load generated by the beam of laser light is determined from the intensity of the incident light at any one time.
In step S906, all the incident laser beam impact loads at the same measuring point are superimposed to determine the first laser impact load after multiple reflection enhancement.
In step S907, the hole is eliminated, the finite element model is built, the flat plate model containing no hole is built, the same laser is set at the same position, and the second laser shock load generated by the laser beam is determined according to the initiating explosive device.
In step S908, the first laser shock load is compared with the second laser shock load to determine a shock enhancement effect.
Alternatively, in one embodiment of the present application, the peak of the laser beam impact load is determined by the following expression:
wherein Z is the impedance at the metal-water interface; the ratio of the energy of the absorbed laser energy molecules is about 0.1 to 0.3; i αi Intensity of incident light absorbed for the metal; i is the number of reflections. Wherein I is αi The expression of (2) may be:
I αi ＝(1-R)I i ，
wherein I is i Is the intensity of incident light; r is the reflection coefficient at the metal-water interface; i αi The intensity of incident light absorbed by the metal.
It should be noted that the foregoing explanation of the embodiments of the initiating explosive device is also applicable to the method for estimating the impact enhancing effect of the initiating explosive device according to the embodiments, and will not be repeated here.
According to the method for estimating the impact enhancement effect of the initiating explosive device impact simulation device, which is provided by the embodiment of the application, the impact load of laser to the bearing piece can be increased, the real initiating explosive device impact environment can be effectively simulated, the response of the component to be tested to the initiating explosive device impact can be obtained, and the enhancement effect of the initiating explosive device impact simulation device to the laser impact can be estimated simply, conveniently, effectively and rapidly. Therefore, the problems that in the related art, when a laser impact simulation method is adopted to simulate the impact of a fire work, the magnitude of impact load generated by laser depends on laser parameters such as laser power density, laser wavelength, pulse width and the like to a large extent, the requirement of test equipment is high, the simulation of the real impact environment of the fire work cannot be fully realized in the impact strength and the like are solved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless explicitly defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions.
Claims (13)
1. An initiating explosive device impact simulator, comprising:
a carrier;
the flexible rope is connected with the bearing piece so as to enable the bearing piece to be in a hanging state;
a laser for generating laser light and generating an impact load on a side of the carrier facing the laser light;
the constraint layer is arranged on one side of the bearing piece facing the laser so as to increase the impact load of the laser on the bearing piece;
wherein, the bearing part is provided with a plurality of holes on one side facing the laser, so that the impact load of the laser on the bearing part can be increased.
2. The initiating explosive device according to claim 1, wherein the hole is a tapered hole.
3. The initiating explosive device according to claim 2, wherein the taper hole inclination angle of the taper hole is greater than 30 ° and less than 45 °.
4. A device according to claim 1 or claim 3, wherein the profile and size of the distribution area of the plurality of apertures is determined by the profile and size of the laser spot projected by the laser on the carrier.
5. The initiating explosive device according to claim 4, wherein the profile of the distribution area is the same as the profile of the laser spot.
6. The initiating explosive device of claim 5 wherein the size of the plurality of hole distribution areas is equal to or greater than the size of the laser spot.
7. The initiating explosive device according to claim 1, wherein the hole distribution of the plurality of holes forms a plurality of concentric circles.
8. The initiating explosive device of claim 1 wherein the confinement layer is a flowing water confinement layer.
9. A method of testing an initiating explosive device according to any one of claims 1 to 8, wherein the method comprises the steps of:
fixing the component to be tested on the side, facing away from the laser, of the bearing piece;
loading an acceleration sensor on the bearing piece and arranging the acceleration sensor to be near the component to be tested;
vertically projecting the laser to the bearing piece, and enabling the projection position of the laser to be consistent with the distribution area of the holes;
collecting data information detected by the acceleration sensor, serving as a fire impact environment born by the component to be tested, comparing the data information with a preset fire impact environment, and if the data information meets the preset precision requirement, meeting the fire impact simulation requirement according to the current working condition;
and if the preset precision requirement is not met, adjusting the laser energy density until the preset precision requirement is met.
10. The method of initiating a fire impact test of claim 9, further comprising:
and adjusting the impact gap time of the laser so as to enable the subsequent laser to continuously apply pulse laser on the basis of incomplete cooling of the material, thereby increasing the impact magnitude of the laser.
11. The method of claim 10, wherein the impingement gap time is at least less than 1.5 times the incident laser pulse width.
12. A method for estimating the impact reinforcement effect of an initiating explosive device impact simulation apparatus, comprising the steps of:
establishing a finite element model of the initiating explosive device impact simulation device according to any one of claims 1-8;
setting a normally incident laser ray beam above the hole of the finite element model;
after the ray beam is injected into the hole, determining the incidence point and the incidence angle of the laser after any reflection times;
determining the incident light intensity of the laser beam after any reflection times according to the incident point and the incident angle;
determining the impact load generated by laser according to the incident light intensity of any incident light;
superposing all incident laser beam impact loads under the same measuring point to determine a first laser impact load after repeated reflection enhancement;
the initiating explosive device impact simulation device according to any one of claims 1-8, wherein a flat plate model without holes is built, the same laser is arranged at the same position, and a second laser impact load generated by the laser is determined;
and comparing the first laser shock load with the second laser shock load to determine a shock enhancement effect.
13. The method for estimating an impact reinforcement effect of an initiating explosive device according to claim 12, wherein a peak of the laser beam impact load is determined by the following expression:
wherein Z is the impedance at the metal-water interface; the ratio of the energy of the absorbed laser energy molecules is ≡I αi Is the intensity of the absorbed incident light; i is the number of reflections.
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