CN115165185A - Curved surface explosive load distributed impulse calibration device - Google Patents
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- CN115165185A CN115165185A CN202210708887.4A CN202210708887A CN115165185A CN 115165185 A CN115165185 A CN 115165185A CN 202210708887 A CN202210708887 A CN 202210708887A CN 115165185 A CN115165185 A CN 115165185A
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Abstract
The invention provides a curved surface explosion load distributed impulse calibration device, which aims to solve the problem that the existing common explosion impulse calibration technology cannot directly calibrate the spatial distribution of the explosion impulse on the surface of a target structure. The device comprises a distributed impulse pendulum assembly, a protective cylinder assembly and a damping shock isolation assembly; the protective cylinder assembly is fixedly arranged on the calibration platform, and the distributed impulse swing assembly is placed in the protective cylinder assembly; the damping and shock insulation assembly is located below the calibration platform and fixed on the ground, a through hole is formed in the center of the calibration platform, and the damping and shock insulation assembly penetrates through the through hole to be connected with the distributed impulse pendulum assembly. The invention realizes the calibration of impulse loads at different spatial positions by arranging a plurality of impulse pendulums according to the designated distribution, and simultaneously, the protection cylinder assembly with the test holes and the damping shock insulation assembly can effectively isolate the influence of explosion airflow and explosion vibration on the calibration precision, thereby providing a convenient and practical operation and test calibration platform for the impulse calibration of the curved surface explosion load.
Description
Technical Field
The invention relates to an explosive shock wave impulse measurement calibration technology, in particular to a curved surface explosive load distributed impulse calibration device.
Background
The impulse of the blast shock wave is an important measure of the effects of blast damage. Through certain design, the realization of the loading of the explosion impulse load distributed in a given space is an important means for examining military weapons and civil protection devices. The space distribution of the explosive impulse load is related to the characteristics of the explosive used on one hand and the space distribution of the explosive on the other hand, and the accurate explosive impulse calibration technology is an important consideration means for the loading characteristics and the space distribution characteristics of the explosive load and is an important basis for designing the explosive load.
The currently common explosion impulse calibration technology comprises a pressure test method, a linear motion impulse probe method, an impulse swing method and the like. The pressure test method is to measure the overpressure of the explosion shock wave by using a pressure sensor and further integrate the positive-phase overpressure to obtain the peak impulse load. The linear motion impulse probe method used by linpeng et al (linpeng, wangchunli, wangwen, etc.; numerical simulation and experimental research of specific impulse of flexible explosive [ J ]. Scientific report of explosives and powders, 2011, (4).) is to attach the explosive to be tested to a flat target, and measure the impulse of explosive loading by measuring the linear motion speed of the flat target after detonation. The impulse pendulum method used by Guo Shi et al (Guo Shi, wan Zhang Jiang, lu Qiang, soft explosion index explosive sheet explosive specific impulse research [ J ]. Military science report 2013,34 (suppl.1): 182-186.) is to attach the explosive to be tested to the plane of a pendulum bob, convert the pendulum bob swing angle after detonation to obtain the initial motion speed of the pendulum bob, and further measure the impulse loading capacity of the explosive. These test methods are mainly used for calibrating the impulse loading characteristics of the explosive itself or measuring the impulse load at a certain spatial position in the form of a single measuring point, and currently, a better calibration method for the spatial distribution of the explosion impulse applied to the surface of a target structure is lacked.
Disclosure of Invention
The invention aims to solve the problem that the existing common explosion impulse calibration technology cannot directly calibrate the spatial distribution of the explosion impulse on the surface of a target structure, and provides a curved surface explosion load distributed impulse calibration device.
In order to achieve the purpose, the invention adopts the technical scheme that:
a curved surface explosive load distributed impulse calibration device is characterized in that: the device comprises a distributed impulse pendulum assembly, a protective cylinder assembly and a damping shock insulation assembly;
the protection cylinder assembly is fixedly installed on the calibration platform and keeps a distance with the curved surface explosive load loading device, and the distributed impulse pendulum assembly is located in the protection cylinder assembly and used for isolating the influence of explosive air flow on impulse;
the damping and shock-isolating assembly is positioned below the calibration platform and fixed on the ground, a through hole is formed in the center of the calibration platform, and the damping and shock-isolating assembly penetrates through the through hole to be connected with the distributed impulse pendulum assembly and is used for isolating the influence of explosion shock on impulse;
the distributed impulse pendulum component comprises a positioning disc and a plurality of impulse pendulums; the impulse pendulum comprises an impulse pendulum bracket, a coder, a swing rod and a mass block; the impulse pendulum support is arranged along the circumference of the positioning disc, one end of the impulse pendulum support is fixedly connected with the positioning disc, and the other end of the impulse pendulum support is connected with the encoder; a rotating shaft of the encoder is connected with one end of a swing rod; the other end of the swing rod is connected with a mass block; the normal direction of the mass block test sensitive surface is consistent with the direction to be tested, and the central normal line of the test sensitive surface is positioned in the vertical plane of the radius of the positioning disc in the direction to be tested; the encoder is used for recording the swing angle of the mass block; the central shaft of the impulse pendulum support is parallel to the radius of the positioning disc in the direction to be measured;
and the side surface of the protective cylinder assembly is provided with test holes which correspond to the test sensitive surfaces of the mass blocks one by one.
Furthermore, the upper surface of the positioning disc is provided with first positioning holes which are uniformly distributed along the circumference, and the outer sides of the first positioning holes are provided with second positioning holes which are uniformly distributed on the same circumference and have the same number; one end of the impulse pendulum support is provided with a first mounting hole corresponding to the first positioning hole and a second mounting hole corresponding to the second positioning hole, and the impulse pendulum support is fixedly connected to the positioning disc by screws penetrating through the first mounting hole and the first positioning hole.
Further, location screw is located radius R1's circumference on the positioning disk, and first mounting hole is located radius R2's circumference, and the first measurable angle of ith is ai, and then the polar coordinate of the first location screw centre of a circle of ith is (R1, ai 1), and the polar coordinate of the first mounting hole centre of a circle of ith is (R2, ai 2), satisfies:
ai1＝ai+arcsin(d/R1)，ai2＝ai+arcsin(d/R2)；
wherein d is the vertical distance between the plane of the central shaft of the impulse pendulum bracket and the plane of the connecting line of the center of the mass block row test sensitive surface and the circle center of the positioning disc;
the aperture of the second mounting hole is larger than that of the second positioning hole, and the second mounting hole is used for finely adjusting the orientation of the impulse pendulum support.
Furthermore, the mass of the mass block is determined according to the impulse of the position to be calibrated, the swing angle amplitudes of the impulse swings with different angles are consistent, and the swing angle amplitude range of the mass block is 0-30 degrees.
Further, the protective cylinder assembly comprises an upper cover, a cylinder body and a lower bottom; the cylinder body is provided with test holes which are in one-to-one correspondence with the test sensitive surfaces of the mass blocks along the circumference; the upper cover is fixedly connected with the cylinder body, and the lower bottom is fixedly connected on the calibration platform.
Furthermore, the diameter of a testing hole in the cylinder is 0.5mm larger than that of a testing sensitive surface of the mass block, the testing sensitive surface of the mass block can freely pass through the testing hole, and the testing sensitive surface of the mass block is flush with the outer surface of the cylinder in an initial natural sagging state.
Further, the damping and shock isolation assembly comprises a circumferential damper, a vertical damper, a supporting upright post and a frame; the top of the frame is fixedly connected with the bottom surface of the calibration platform, and the bottom of the frame is fixed on the ground; the upper end of the supporting upright post penetrates through a through hole in the center of the calibration platform to be fixedly connected with the positioning plate, and the lower end of the supporting upright post is connected with the lower part of the frame; the annular damper and the vertical damper are arranged inside the frame, are coaxially connected with the supporting column and are used for isolating vibration in the horizontal direction and vibration in the vertical direction respectively.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the invention provides a distributed impulse calibration device for curved surface explosive loads, which designs a distributed impulse pendulum with a test hole protection cylinder and damping shock insulation according to the appearance of a target load to be tested, realizes the calibration of impulse loads at different spatial positions by arranging a plurality of impulse pendulums according to the specified distribution, can effectively isolate the influence of explosive airflow, explosive vibration and the like on the calibration precision by the protection cylinder component with the test hole and the damping shock insulation component, and provides a convenient and practical operation and test calibration platform for the impulse calibration of the curved surface explosive loads.
2. The distributed impulse calibration device for the curved surface explosive load can be suitable for impulse tests of loads with different strengths by flexibly adjusting the mass of the impulse pendulum mass block, and realizes large-range and high-resolution load space distribution impulse calibration by matching with a high-precision encoder.
3. The curved surface explosive load distributed impulse calibration device provided by the invention is provided with the test hole protection cylinder and the damping shock insulation assembly, and the influence of most of explosive airflow and explosive vibration on the oscillation process of the impulse pendulum is isolated, so that the system has higher anti-explosion shock insulation performance, and the precision of load space distributed impulse calibration is improved.
4. The distributed impulse calibrating device for the curved surface explosive load, provided by the invention, is provided with the test hole protection cylinder, the test hole distribution and the positioning disc in the distributed impulse pendulum component, and can be designed into an irregular shape according to the appearance of a target load to be tested, so that the impulse calibration of the irregular curved surface load is realized.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a distributed impulse calibration device for curved surface explosive loads according to the present invention;
FIG. 2 is a schematic structural diagram of a distributed momentum pendulum assembly according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a method for calculating an angle of a positioning hole of a positioning disc according to an embodiment of the present invention;
FIG. 4 is a schematic view of a guard barrel assembly according to an embodiment of the present disclosure;
FIG. 5 is a schematic view of the structure of the damping and seismic isolation assembly according to the embodiment of the invention.
Reference numerals:
1-a distributed impulse pendulum assembly, 2-a protective cylinder assembly, 3-a damping shock insulation assembly and 4-a calibration platform;
11-a positioning disc, 12-an impulse pendulum bracket, 13-an encoder, 14-a swing rod and 15-a mass block;
21-upper cover, 22-cylinder, 23-bottom;
31-annular damper, 32-vertical damper, 33-supporting upright post and 34-frame.
Detailed Description
In order to make the objects, advantages and features of the present invention more clear, a curved surface explosive load distributed impulse calibration device proposed by the present invention is further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the curved surface explosive load distributed impulse calibration device provided by this embodiment includes a distributed impulse pendulum assembly 1, a protective cylinder assembly 2, and a damping vibration isolation assembly 3. Protection section of thick bamboo subassembly 2 fixed mounting is on demarcation platform 4, and distributed impulse pendulum subassembly 1 is placed in protection section of thick bamboo subassembly 2, and damping shock insulation subassembly 3 is located and marks 4 below and fix subaerial. A through hole is formed in the center of the calibration platform 4, and the damping and shock insulation assembly 3 penetrates through the through hole to be connected with the distributed impulse pendulum assembly 1 so as to isolate the influence of explosion shock on the swing process of the impulse pendulum.
As shown in fig. 2, the distributed momentum pendulum assembly 1 includes a positioning plate 11, a momentum pendulum support 12, an encoder 13, a pendulum rod 14 and a mass block 15;
first positioning holes are uniformly distributed along the circumference on the upper surface of the positioning disc 11, and second positioning holes which are equal in number and are uniformly distributed on the same circumference are arranged in the radial direction of the outer side of the first positioning holes; one end of the impulse pendulum support 12 is provided with a first mounting hole corresponding to the first positioning hole and a second mounting hole corresponding to the second positioning hole, and the impulse pendulum support 12 is fixedly connected to the positioning plate 11 by adopting screws to penetrate through the first mounting hole and the first positioning hole, so that the impulse pendulum support 12 faces different calibration angles; the aperture of the second mounting hole is slightly larger than that of the second positioning hole, and the second mounting hole is used for finely adjusting the orientation of the momentum pendulum support 12 so as to achieve fine adjustment of the orientation of the momentum pendulum support 12. The other end of the impulse pendulum support 12 is connected with a high-precision encoder 13. A rotating shaft of the encoder 13 is connected with one end of the swing rod 14, free swing of the swing rod 14 is achieved, and the swing angle of the swing rod 14 is recorded by the encoder 13. The other end of the swing rod 14 is connected with a mass block 15, and the test sensitive surface of the mass block 15 is circular and has the same direction as the impulse swing bracket 12. The plane of the central shaft of the impulse pendulum support 12 is parallel to the plane of the connecting line of the center of the test sensitive surface of the mass block 15 and the circle center of the positioning disc 11. The mass of the mass block 15 is configured according to the impulse of the position to be calibrated, the larger the impulse to be measured is, the larger the mass of the mass block is, the smaller the impulse to be measured is, and the smaller the mass of the mass block is, so that the final effect is achieved that the swing angle amplitudes of the impulse pendulums with different angles are basically consistent, and the range of the amplitude is 0-30 degrees.
As shown in fig. 3, the positioning screw holes on the positioning plate 11 are located on the circumference of the radius R1, the first mounting holes are located on the circumference of the radius R2, the number of the first mounting holes is m, and the number m is the maximum measurable angle number of the positioning plate 11. Assuming that the ith measurable angle is ai (starting from any radius passing through the center of the positioning disk 11 and positive counterclockwise), the polar coordinates of the center of the ith positioning screw hole are (R1, ai 1), and the polar coordinates of the center of the ith first mounting hole are (R2, ai 2), which satisfy:
ai1＝ai+arcsin(d/R1)，ai2＝ai+arcsin(d/R2)；
wherein d is the vertical distance between the plane of the central axis of the impulse pendulum support 12 and the plane of the connecting line of the center of the mass block 15 row test sensitive surface and the circle center of the positioning disk 11. As shown in fig. 4, the shielding cylinder assembly 2 is covered outside the distributed impulse oscillating assembly 1, and is used for isolating most of the blast air flow from influencing the oscillating process of the shielding distributed impulse oscillating assembly 1. The shield cylinder assembly 2 is cylindrical and includes an upper cover 21, a cylinder 22 and a lower base 23. The cylinder 22 is provided with test holes at the same vertical height on the circumference, and the test holes are distributed at intervals consistent with the direction to be tested and correspond to the test sensitive surfaces of the mass blocks 15 one by one. The test hole is matched with the test sensitive surface shape of the mass 15, and when the mass 15 is in an initial natural sagging state, the test sensitive surface of the mass 15 can freely pass through the test hole and is flush with the outer surface of the cylinder 22. The diameter of the test hole is slightly larger than the diameter of the test sensitive surface of the mass block 15, generally 0.5mm, so that the mass block 15 is not influenced by the friction action of the cylinder 22, and meanwhile, the explosive airflow can be prevented from entering the cylinder 22 through the test hole too early to influence the impulse pendulum motion.
After the distributed impulse pendulum component 1 is placed in the protective cylinder component 2, the upper cover 21 is fixedly connected with the cylinder 22 through a bolt, and the lower bottom 23 is fixed on the steel frame calibration platform 4 through a bolt and a screw.
As shown in fig. 5, the damped seismic isolation assembly 3 includes a circumferential damper 31, a vertical damper 32, a support column 33, and a frame 34. The top of the frame 34 is fixedly connected with the bottom surface of the calibration platform 4, and the bottom of the frame 34 is fixed on the ground to keep the stability of the calibration device; the supporting upright column 33 penetrates through the frame 34, the upper end of the supporting upright column penetrates through the central through hole of the calibration platform 4 to be fixedly connected with the positioning plate 11, and the lower end of the supporting upright column is connected with the frame 34. The annular damper 31 and the vertical damper 32 are disposed inside the frame, and are connected to the support column 33 for isolating vibration in the horizontal direction and the vertical direction, respectively.
Firstly, according to the direction of the impulse to be measured, a positioning disc 11 and an impulse pendulum support 12 are connected, the direction of the impulse pendulum is roughly determined, an encoder 13, a pendulum rod 14 and a mass block 15 are sequentially connected, the direction of a test sensitive surface of the mass block 15 is adjusted, and a test cable of the encoder 13 is led out. And covering the protective cylinder assembly 2 outside the distributed impulse pendulum assembly 1, enabling the testing sensitive surface of the mass block 15 to face the testing hole in the cylinder body 22, and fixing the protective cylinder assembly 2 on the calibration platform 4. And finally, fixedly mounting a damping shock insulation assembly 3 to ensure the stability of the impulse calibration device and finish assembly.
Before the impulse calibration is started, the curved surface explosive load loading device is fixed on the calibration platform 4, keeps a certain distance from the protective cylinder assembly, and is connected with triggering and testing equipment, so that the distributed impulse calibration of the curved surface explosive load can be carried out.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the present invention.
Claims (7)
1. The utility model provides a curved surface explosive load distributing type impulse calibration device which characterized in that: the device comprises a distributed impulse pendulum assembly (1), a protective cylinder assembly (2) and a damping shock insulation assembly (3);
the protection cylinder assembly (2) is fixedly installed on the calibration platform (4) and keeps a distance with the curved surface explosion load loading device, and the distributed impulse pendulum assembly (1) is located in the protection cylinder assembly (2) and used for isolating the influence of explosion airflow on impulse;
the damping and shock-isolating assembly (3) is positioned below the calibration platform (4) and fixed on the ground, a through hole is formed in the center of the calibration platform (4), and the damping and shock-isolating assembly (3) penetrates through the through hole to be connected with the distributed impulse pendulum assembly (1) and is used for isolating the influence of explosion shock on impulse;
the distributed impulse pendulum assembly (1) comprises a positioning disc (11) and a plurality of impulse pendulums; the impulse pendulum comprises an impulse pendulum bracket (12), an encoder (13), a swing rod (14) and a mass block (15); the impulse pendulum support (12) is arranged along the circumference of the positioning disc (11), one end of the impulse pendulum support (12) is fixedly connected with the positioning disc (11), and the other end of the impulse pendulum support is connected with the encoder (13); a rotating shaft of the encoder (13) is connected with one end of the swing rod (14); the other end of the swing rod (14) is connected with a mass block (15); the normal direction of the test sensitive surface of the mass block (15) is consistent with the direction to be tested, and the central normal line of the test sensitive surface is positioned in the vertical plane of the radius of the direction to be tested of the positioning plate (11); the encoder (13) is used for recording the swing angle of the mass block (15); the central axis of the impulse pendulum support (12) is parallel to the radius of the positioning disc (11) in the direction to be measured;
and the side surface of the protective cylinder assembly (2) is provided with test holes which correspond to the test sensitive surfaces of the mass blocks (15) one by one.
2. The curved surface explosive load distributed impulse calibration device according to claim 1, characterized in that:
the upper surface of the positioning disc (11) is provided with first positioning holes which are uniformly distributed along the circumference, and the outer sides of the first positioning holes are provided with second positioning holes which are uniformly distributed on the same circumference and have the same number; one end of the impulse pendulum support (12) is provided with a first mounting hole corresponding to the first positioning hole and a second mounting hole corresponding to the second positioning hole, and the impulse pendulum support (12) is fixedly connected to the positioning disc (11) by screws penetrating through the first mounting hole and the first positioning hole.
3. The curved surface explosive load distributed impulse calibration device according to claim 2, characterized in that:
the locating screw hole is located radius R1's circumference on positioning disk (11), and first mounting hole is located radius R2's circumference, and the ith measurable angle is ai, and then the polar coordinate of the ith locating screw hole centre of a circle is (R1, ai 1), and the polar coordinate of the ith first mounting hole centre of a circle is (R2, ai 2), satisfies:
ai1＝ai+arcsin(d/R1)，ai2＝ai+arcsin(d/R2)；
wherein d is the vertical distance between the plane of the central shaft of the impulse pendulum support (12) and the plane of the connecting line of the center of the test sensitive surface of the mass block (15) and the circle center of the positioning disc (11);
the aperture of the second mounting hole is larger than that of the second positioning hole, and the second mounting hole is used for finely adjusting the orientation of the impulse pendulum support (12).
4. The curved surface explosive load distributed impulse calibration device according to claim 3, characterized in that:
the mass of the mass block (15) is determined according to the impulse of the position to be calibrated, the swing angle amplitudes of the impulse swings with different angles are consistent, and the swing angle amplitude range of the mass block (15) is 0-30 degrees.
5. The curved surface explosive load distributed impulse calibration device according to claim 4, characterized in that:
the protective cylinder assembly (2) comprises an upper cover (21), a cylinder body (22) and a lower bottom (23); the cylinder body (22) is provided with test holes which are in one-to-one correspondence with the test sensitive surfaces of the mass blocks (15) along the circumference; the upper cover (21) is fixedly connected with the cylinder body (22), and the lower bottom (23) is fixedly connected on the calibration platform (4).
6. The curved surface explosive load distributed impulse calibration device according to claim 5, characterized in that:
the diameter of a testing hole in the cylinder (22) is 0.5mm larger than that of a testing sensitive surface of the mass block (15), the testing sensitive surface of the mass block (15) can freely pass through the testing hole, and the testing sensitive surface of the mass block (15) is flush with the outer surface of the cylinder (22) in an initial natural sagging state.
7. The curved surface explosive load distributed impulse calibration device according to any one of claims 1 to 6, characterized in that:
the damping and shock-isolating assembly (3) comprises a circumferential damper (31), a vertical damper (32), a supporting upright post (33) and a frame (34); the top of the frame (34) is fixedly connected with the bottom surface of the calibration platform (4), and the bottom of the frame (34) is fixed on the ground; the upper end of the supporting upright post (33) penetrates through a through hole in the center of the calibration platform (4) to be fixedly connected with the positioning plate (11), and the lower end of the supporting upright post is connected with the lower part of the frame (34); the annular damper (31) and the vertical damper (32) are arranged inside the frame, are coaxially connected with the support column (33), and are used for isolating vibration in the horizontal direction and vibration in the vertical direction respectively.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115823973A (en) * | 2022-11-28 | 2023-03-21 | 北京理工大学 | Multi-probe positioning and collecting device for testing detonation growth and testing method |
| CN116050193A (en) * | 2023-04-03 | 2023-05-02 | 中国航发四川燃气涡轮研究院 | Damping hole layout method for improving high cycle fatigue life of elastic ring |
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