CN108895932B - Projectile for mechanical experiment of impact gas gun and device for testing speed of projectile - Google Patents
Projectile for mechanical experiment of impact gas gun and device for testing speed of projectile Download PDFInfo
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- CN108895932B CN108895932B CN201810445001.5A CN201810445001A CN108895932B CN 108895932 B CN108895932 B CN 108895932B CN 201810445001 A CN201810445001 A CN 201810445001A CN 108895932 B CN108895932 B CN 108895932B
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- 238000002474 experimental method Methods 0.000 title claims abstract description 49
- 238000012360 testing method Methods 0.000 title description 14
- 239000002184 metal Substances 0.000 claims description 53
- 239000004519 grease Substances 0.000 claims description 12
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 9
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 9
- 239000001099 ammonium carbonate Substances 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 239000004417 polycarbonate Substances 0.000 claims description 5
- 229920000515 polycarbonate Polymers 0.000 claims description 5
- 230000008014 freezing Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 238000009527 percussion Methods 0.000 claims description 2
- 239000006187 pill Substances 0.000 abstract description 34
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 12
- 238000000926 separation method Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 8
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- 238000009434 installation Methods 0.000 description 6
- 230000001788 irregular Effects 0.000 description 5
- 239000011553 magnetic fluid Substances 0.000 description 5
- 239000008188 pellet Substances 0.000 description 5
- 241000446313 Lamella Species 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011859 microparticle Substances 0.000 description 3
- 229910052755 nonmetal Inorganic materials 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 241000973497 Siphonognathus argyrophanes Species 0.000 description 2
- 230000009471 action Effects 0.000 description 2
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- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B35/00—Testing or checking of ammunition
- F42B35/02—Gauging, sorting, trimming or shortening cartridges or missiles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
- F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
- F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
- F42B12/56—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing discrete solid bodies
- F42B12/58—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
- G01P3/54—Devices characterised by the use of electric or magnetic means for measuring linear speed by measuring frequency of generated current or voltage
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a primary and secondary projectile for an impact gas gun mechanical experiment and a device for measuring the speed of the projectile, belonging to the technical field of separation of the primary and secondary projectiles, and aiming at the impact dynamics experiment of selecting a certain point structure for special-shaped projectile collision, the invention comprises the following steps: the problem that the inner bullet pill deviates from a designed flight path and the problem of measuring the speed of the bullet pill, the structure of the primary and secondary bullets and the bullet speed measuring equipment are accurately designed, and the two problems are solved. In the experimental process, the bullet splitting is carried out without depending on the friction between the female bullet and air, but the female bullet is reliably split by depending on the heat caused by the friction between the female bullet and the gun barrel and the rotating inertia of the female bullet.
Description
Technical Field
The invention belongs to the technical field of primary and secondary projectiles, and particularly relates to a special primary and secondary projectile for a mechanical experiment of an impact gas gun and a device for testing the projectile.
Background
In the mechanical experiment of the impact gas gun, high-pressure gas is often adopted to drive the projectile, and the technical literature data is described as follows:
third chapter, chapter two, the third section (courteous, pretty and junxiang major) of the theory of high voltage, published by the national defense industry publishing society in 2006;
wanningyu, first order light gas cannon for material collision experiments, explosion and impact, 1993,13 (1): 90-96;
guo Yang Width and the like, and is based on solving research and tool technology of the normal line and tangent plane of the Archimedes helicoid of matlab, 2009, 11: 77-794;
liufanran, Chongqing, machining the root of Archimedean helicoid with a disk cutter, mechanischen, 1997 (1): 13-14.
As shown in fig. 1, the mother projectile is made of hard plastic (polycarbonate), the projectile is provided with a flyer in a specific shape, after the projectile flies through the barrel at high speed, the flyer impacts a target body fixed in a closed target chamber, so as to carry out impact loading on an experimental object, and the general flyer has a sheet structure and can be tightly combined with the projectile; the projectile does not fall off during accelerated flight in the barrel, while the velocity of the metal flyer can be measured by the electromagnetic coil mounted at point a in fig. 1.
However, in some special structure impact loading experiments, an irregular-shaped metal or nonmetal sample is needed to impact a certain point of a special structure, such as a spherical or square sample, and in such air cannon experiments, the size of the sample used for impact is small compared with that of a bullet; it is necessary to embed a small spherical or square (or other special-shaped) metal or nonmetal sample in a large bullet body in advance to form a primary and secondary bullet, as shown in fig. 1, in the experimental process, after the primary and secondary bullet combination is accelerated by an air cannon barrel, at the point a in fig. 1 when the primary and secondary bullet combination passes through the barrel, the metal or nonmetal bullet obtains the same speed as the primary bullet, and simultaneously, after the bullet combination passes through the acceleration process of the barrel, the bullet pill must be completely separated from the primary bullet before colliding with a structural target. In addition, because the metal shot in the parent shot is very small, an electrical signal cannot be induced in the electromagnetic coil when the metal shot passes through the muzzle at point A in fig. 1, so that the speed of the parent and child shots cannot be measured.
In such experiments, collision of materials other than the bullet (including the parent bullet) onto the test object (the structural target in fig. 1) causes serious deviation of the experimental results.
In such experiments, the sample size generally used for collisions is small, and three objectives need to be achieved in the experiment to ensure successful experiment:
1. irregular bullet (small sample) must be completely separated from the mother bullet after accelerated through the gun barrel;
2. the flight direction cannot be changed in the process of separating the irregular small sample from the mother projectile. Must still fly in the direction of barrel alignment; during and after the flying of the small sample from the mother projectile, the small sample touches any tube wall or device before hitting the structural target, which leads to experimental failure.
3. It is necessary to accurately measure the velocity of the quantum projectile before it hits the target.
In the present experiments of this type, there are two techniques for making the pellets:
the first technical scheme is that a mother projectile is integrally manufactured, a small sample is embedded at the front end of the projectile, as shown in figure 2a, after the projectile flies through a gun barrel, the front surface of the projectile touches a high-hardness cylindrical through hole in a target chamber, as shown in figure 1, the cylindrical device is called as a miss-target device; because the density of the bullet pill embedded at the front end of the female bullet pill is far greater than that of the female bullet pill, and meanwhile, the strength of the female bullet pill is also far smaller than that of the through hole, the primary bullet pill and the secondary bullet pill can be separated from each other at the through hole, the material of the female bullet pill is split outside the through hole (point B in figure 1), and the bullet pill flies to the structural target due to inertia to impact and load the experimental object, so that the dynamic impact experiment of the structural target is completed.
In such impact experiments, the general method of measuring the velocity of a quantum pellet is: before separating the parent-child projectiles, a high-speed camera is adopted outside a closed target chamber to shoot the flight process of a parent-child projectile combination body between A and B in the first drawing through a window arranged on the surface of the target chamber, and the flight speed of the projectiles is calculated according to the positions of the projectiles at different times and the corresponding relation between the positions and the time.
The first prior art has the following disadvantages:
the existing high-end high-speed camera is expensive, the price of a high-speed camera with a million-width per second specification is generally more than hundreds of thousands, photos of a shrapnel shot in an experiment often show long-strip fuzzy double images, the flying position of the bullet is difficult to accurately judge according to the photos, meanwhile, the mode of deducing the speed of the bullet according to the speed of the mother bullet is an indirect measurement mode, and a large error exists between the flying speed value and the true value of the bullet obtained from the indirect measurement mode. To increase the high-speed camera measurement accuracy, the measurement distance between a and B in fig. 1 needs to be increased, which increases the length of the closed target chamber; since the length of the experimental target chamber for the impact gun is proportional to the manufacturing price, the method of measuring the speed by using a camera generally increases the construction cost of the target chamber by 50 to 100 thousands (the increased cost is also related to the diameter of the target chamber).
Most seriously, the middle part of the female bullet, which is in contact with the metal bullet pill, is easy to pass through the through hole together with the metal bullet pill in a high-speed collision experiment (an experiment that the bullet speed is higher than 2000 m/s), and the middle part of the female bullet meets the structural target, so that the whole experiment fails.
According to the second technical scheme, the projectile is made into two separated petal-shaped samples, as shown in fig. 2b, a small metal sample is placed at the front end of the projectile, after the projectile flies through a gun barrel, the small metal sample is rubbed with air in a target chamber, the petal-shaped projectile is separated, the metal sample flies out of the projectile, and the experimental object is loaded.
The method for measuring the metal sample is the same as the technical scheme, and a high-end high-speed camera is adopted for photographing.
The second prior art has the following disadvantages:
under the air friction action of the double-petal type mother projectile and the closed target chamber, the mother projectile petals in the separation process and the air act to generate vortex; as the projectile is split due to friction with air, in the process of splitting, the projectile is split from front to back, and the flying attitude of the flying projectile for splitting the projectile is shown in fig. 3, in the process, the split projectile body is very easy to deviate the built-in sub-projectile belt from the designed flying route, so that the experiment fails;
in the experiment, if irregular metal (such as a square or short columnar sample) is needed to be used as a bullet pill, the track generated by the friction between the irregular surface and air after the separation of the bullet pill and the mother pill is more difficult to determine, so that the flight track after the separation is more easy to have serious deviation from the designed flight path, and the experiment fails; in addition, the technology and the resulting disadvantages of the technology and the resulting scheme for measuring the flight speed of the shrapnel assembly by using a high-speed camera are the same.
Therefore, it is necessary to provide a new design of parent-child projectile and its separation technology, and a set of device for measuring quantum projectile needs to be designed to overcome the problems of unstable flap when parent projectile is separated from bullet projectile embedded therein, unstable flight of bullet projectile, and indirect and inaccurate measurement of bullet projectile speed in the prior art.
Disclosure of Invention
In order to overcome the problems in the background art, the invention provides a composite bullet for an air cannon structure impact experiment and a device for measuring the speed of the bullet projectile, wherein the composite bullet is stable in flight, a female bullet can be stably separated from the bullet projectile, and the flight speed of the bullet projectile is conveniently measured.
In order to achieve the purpose, the invention is realized according to the following technical scheme:
the bullet for the mechanical experiment of the impact gas gun comprises a bullet and a female bullet, wherein the bullet is coated inside the female bullet, and the female bullet is in a split petal-shaped structure.
The preferable technical scheme is that the female projectile is in a multi-petal structure, and each petal is provided with an Archimedes spiral surface; the number of lobes is 3 to 5 lobes, and each lobe side surface forms a spiral line.
The further preferable technical scheme is that the parent projectile is made of polycarbonate, and the winding degree of a spiral line formed on the side surface of each petal-shaped projectile of the parent projectile is different.
The preferable technical scheme is that each petal of the multi-petal female projectile is provided with a metal layer parallel to the Archimedes spiral surface, the metal layer is arranged at the middle lower part of the inner part of each petal of the female projectile, the thickness of the metal layer is less than one fourth of the diameter of the projectile, and the metal layer is of a structure with a thin upper part and a thick lower part.
The further preferable technical scheme is that vacuum grease is coated at the twisting position of the female bullet sheet, and the ammonium carbonate micron particles are doped in the vacuum grease.
A device for testing strike air gun mechanics experiment bullet pill speed adopts tile lamella form speed measuring coil to do the spiral type and lays and form the sub gun barrel that tests the speed.
The preferable technical scheme is that the speed measuring gun barrel can change the diameter size according to the size of the bullet so as to achieve the purpose of measuring an induced electric signal when the bullet pill flies.
The invention has the beneficial effects that:
1. after the female projectile is designed according to the invention, the spiral line at the side of the female projectile has the gyro orientation effect, so that the projectile rotates in an accelerating manner in the launching process in the gun barrel, and the rotating projectile cannot deviate from the launching direction after penetrating out of the muzzle. Because the rotating bullet cannot turn over when passing through the muzzle to fly, the accuracy of the directional collision of the bullet is greatly improved.
2. In the invention, a parent pellet splitting mode is adopted; unlike conventional designs, the rotational momentum of the parent projectile is primarily at the rear of the projectile as it flies out of the barrel, causing each lobe to rapidly break apart from the parent projectile from back to front, as shown in fig. 8. The whole splitting process is carried out in vacuum, the mother projectile cannot deflect due to friction with air, and the child projectiles cannot be influenced by the mother projectile in the splitting process.
The bullet pill is arranged at the rear end of the female pill and is parallel to the position for rotating the metal layer, so that the contact time between the female pill and the bullet pill is reduced, and in addition, in the invention, a miss-target device is not required; therefore, the length of the target chamber is effectively reduced, and the construction cost of the gas gun experimental device is reduced; by adopting the invention, the construction cost of the target chamber can be reduced by 50 to 100 ten thousand.
3. The difference from the traditional primary and secondary projectile separation technology is as follows: the vacuum grease mixed ammonium carbonate microparticles are smeared at the contact positions between the valve pills, and the ammonium carbonate microparticles are decomposed by heat brought by friction with a gun barrel; the pressure generated by the decomposition makes the splitting more rapid and reliable.
4. The difference from the traditional primary and secondary projectile separation technology is as follows: in the invention, the target chamber of the gas gun is vacuumized; therefore, the primary and secondary projectiles can not turn over due to turbulent flow generated by friction with air after flying out of the gun barrel, and irregular metal can be used as the secondary projectiles under the scheme of the invention. Thereby expanding the selection range of the experimental subject.
5. To the flight speed of the bullet difference, the degree of kinking of the helix of the setting of female bullet avris designs to be different, and when low speed, the degree of kinking of every lamella helix is little, and short distance rotation rate accelerates in the barrel, and the degree of kinking of every lamella helix is big when high speed, has both guaranteed the stability of female bullet flight in the barrel, can guarantee again that female bullet can steadily split after flying out the barrel.
Drawings
FIG. 1 is a schematic structural view of a conventional gas gun;
fig. 2a and 2b are schematic structural diagrams of a common whole-petal pill and a two-petal pill;
FIG. 3 is a schematic view of the flight attitude of a prior art projectile;
FIG. 4 is a schematic side view of the projectile;
FIG. 5 is a schematic diagram I of the internal structure of the projectile;
FIG. 6 is a schematic diagram II of the internal structure of the projectile;
FIG. 7 is a schematic diagram III of the internal structure of the projectile;
FIG. 8 is a schematic view of the projectile opening flight attitude of the present invention;
FIG. 9 is a schematic view of a tile-shaped velocity coil for measuring velocity of bullet projectile according to the present invention;
FIG. 10 is a schematic view of the installation of the tile-shaped velocity coil for measuring velocity of bullet projectile according to the present invention;
11a, 11b are sectional views I of the coiled test tube with the tile-shaped speed measuring coil;
FIG. 12 is an external mounting diagram of a coiled test tube of a tile-shaped velocity measurement coil;
FIG. 13 is a front view of the support and base of the tile velocity coil;
FIG. 14 is a top view of the support and base of the tile velocity coil;
FIG. 15 is a flow chart of a bullet pill-velocity gun barrel adaptation experiment;
FIG. 16 is a schematic diagram of an exemplary tachometer signal I;
fig. 17 is a diagram ii of a typical tachometer signal.
In the figure, 1-bullet, 2-spiral line, 3-top of mother bullet, 4-bottom of mother bullet, 5-groove, 6-Archimedes spiral surface, 7-metal layer, 8-outer edge, 9-corrugated speed measuring coil, 10-positive and negative poles, 11-magnetofluid, 12-metal thin rod, 13-round shaft, 14-coil spring, 15-force application point, 16-bracket, 17-installation route, 18-base, 19-bolt b, 20-level gun and 21-bolt a.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Preparation of the experimental procedure:
the sealed target chamber (see FIG. 1) was evacuated during the experiment.
In the process of manufacturing the female projectile, the female projectile is made into a three to five-lobe shape, fig. 4 is a side view of the projectile, and the position of the sub-projectile 1 is close to the bottom of the female projectile.
The internal shape of each petal of the female projectile is petal-shaped and is stranded into a whole.
Each section of spiral line of the female projectile is 2; the top 3 of the female projectile is concave; the bottom 4 of the female projectile is concave; the action of the top 3 of the female projectile makes the female projectile rotate stably; when the high-pressure air chamber in fig. 1 discharges gas, the bottom 4 of the female projectile can keep stable to push the female projectile to fly.
FIG. 5 is a view I of the interior of a bullet, showing an Archimedes spiral surface 6 in the interior of each lobe of a lobed female bullet; a groove 5 for placing the bullet is dug in the female bullet; FIG. 6 is a view II of the inside of the bullet, the lower middle part of each bullet is provided with a metal layer 7 parallel to the Archimedes spiral surface 6, the metal layer 7 is arranged at the lower middle part of the inner part of each split section of the female bullet, the thickness of the metal layer 7 is smaller than one fourth of the diameter of the female bullet, and the metal layer 7 is in a structure with a thin upper part and a thick lower part.
FIG. 7 is a schematic diagram III of the structure of the projectile; vacuum grease is coated on the stranded contact outer edge 8 of the valve plate of the mother projectile, ammonium carbonate microparticles are doped in the vacuum grease, the projectile is frozen before the experiment, ammonium carbonate is guaranteed not to be decomposed, heat is brought by the rotation of the projectile and the friction between gun tubes in the experiment, the valve plate is combined with the ammonium carbonate particles in the vacuum grease at the outer edge and is decomposed, decomposition gas enables the valve plate to have certain pressure between the valve plate before the muzzle is discharged, after the muzzle is discharged, the pressure is released quickly, the valve plate is exploded quickly, as shown in figure 8, and the purpose of quickly splitting is achieved.
The device for testing the speed of the bullet pill in the impact air gun mechanical experiment is arranged at the outlet of the air gun, the device is made by connecting a multi-section pipeline front and back, a tile-shaped speed measuring coil 9 is arranged on the pipeline, and as shown in figure 9, the curved surface formed by the tile-shaped speed measuring coil 9 is parallel to the flight direction of the bullet pill; in the experiment, when the metal projectile passes through the tile-shaped speed measuring coil 9, voltage can be induced in positive and negative two stages of the coil, and positive and negative electrodes 10 are led out from the tile-shaped speed measuring coil 9; the positive and negative electrodes 10 are connected with a high-speed oscilloscope of peripheral equipment, and the voltage induced by the tile-shaped speed measuring coil 9 is recorded by the oscilloscope.
The moment when the bullet 1 flies over each coil can be read by an oscilloscope; and dividing the distance L between two adjacent coils by the induced voltage time t when the bullet flies over two adjacent tile-shaped velocity measurement coils to obtain the flying speed of the bullet pill.
In addition, the magnetic fluid 11 is annularly installed inside the tile-shaped velocity measuring coil 9, as shown in fig. 9, in the experimental process, the bullet 1 passes through the velocity measuring pipeline, the induced electric field in the tile-shaped velocity measuring coil 9 can cause the magnetic fluid to flow in a micro manner, and the induced electric field in the tile-shaped velocity measuring coil 9 is further enhanced due to the flow.
The tile-shaped speed measuring coil 9 is arranged on the scroll-shaped coil spring 14, as shown in fig. 10, and is a front view of the coil installation; the installation route 17 of the tile-shaped speed measuring coil 9 is spirally twisted on the speed measuring pipeline, as shown in fig. 11a, which is a side view of the coil installation.
To achieve the above experimental effect, a plurality of coils are used in parallel connection, as shown in fig. 11 b.
As shown in fig. 12, the outer edge of the coil spring 14 is provided with a plurality of force application points 15; evenly distributed along the length direction of the pipeline; the connection point 15 is provided with a string. In the experiment the string is pulled and the coil spring 14 is wound up, providing only a passage of the projectile 1 through the pipe, whereby the maximum induced electrical signal strength can be measured.
Referring to fig. 12, the end of a coil spring 14 is fixed to a metal thin rod 12, and the direction of the metal thin rod 12 is parallel to the direction of the gun barrel; the metal thin rod 12 is fixed on the bracket 16, as shown in fig. 13, which is a front view of the bracket structure; fig. 14 is a top view of the stent structure. The bracket consists of a left part and a right part, and the right bracket 16 fixes the metal thin rod 12; the left bracket 16 is provided with a bolt a21, and the right end of the bolt a21 is provided with a round shaft 13 parallel to the metal thin rod 12 for stabilizing the shape of the coil spring 14. The circular shaft 13 passes through the right end of the bolt 21 and is rotatable within the bolt 21. The distance between the metal thin rod 12 and the round shaft 13 can be adjusted by screwing in or out the bolt a 21. The distance between the metal thin rod 12 and the circular shaft 13 is changed in synchronization with the inner diameter of the coil spring 14.
The whole bracket 16 is fixed on a base 18, a bolt b19 is arranged on the base 18, a bolt b19 is used for adjusting the level of the base 18, and a level bubble 20 is arranged on the base 18 and used for observing whether the base 18 is in the horizontal position or not. The mounting positions of the brackets 16, the coil springs 14, the bolts a21, the bolts b19 and the vials 20 are shown in FIGS. 13-14.
The experimental flow for the bullet-velocity measuring gun barrel adaptation implementing the invention is shown in figure 15.
The four bolts b19 on the velocity measuring tube base are adjusted first until the velocity measuring tube mouth is opposite to the gun tube mouth, and the base 18 is in the horizontal state. Calculating the degree of winding of each helical line 2 inclination angle according to the length of the mother projectile and the flying speed of the mother projectile, placing the bullet 1 in the mother projectile, launching the mother projectile, observing whether the bullet 1 passes through a speed measuring pipe with a preset larger diameter after an experiment, and if the bullet 1 does not pass through, changing the degree of winding of each helical line 2 on the mother projectile, so that the rotating speed of the mother projectile is increased, and the splitting is stable; after the bullet 1 passes through the speed measuring tube, the diameter of the speed measuring tube is reduced until the speed measuring signal is clear; and completing the experiment of the collision structure target point of the bullet 1.
Example 1
Structure of the projectile for ballistic bubble mechanics experiments:
the bullet for the mechanical experiment of the impact gas gun comprises a bullet and a female bullet, wherein the bullet 1 is coated inside the female bullet, and the female bullet is in a split petal-shaped structure.
The further preferred technical scheme is that the female projectile is of a multi-petal structure, each petal is petal-shaped and is stranded into a whole, the number of petals is 3 to 5, and spiral lines are arranged on the side surface of each petal-shaped projectile.
The further preferable technical proposal is that each segment of spiral line of the female projectile is 2; the top 3 of the female projectile is concave; the bottom 4 of the female bullet is concave, and each petal of the petal-shaped female bullet is internally provided with an Archimedes spiral surface 6; the female projectile is provided with a groove 5 for accommodating the male projectile.
The further preferable technical scheme is that the parent projectile is made of polycarbonate, and the winding degree of a spiral line formed on the side surface of each petal-shaped projectile of the parent projectile is different.
A further preferable technical scheme is that each petal of the multi-petal type female projectile is provided with a metal layer 7 parallel to the Archimedes spiral surface, the metal layer 7 is arranged at the middle lower part of the inner part of each petal of the female projectile, the thickness of the metal layer 7 is smaller than one fourth of the diameter of the female projectile, and the metal layer 7 is of a structure with a thin upper part and a thick lower part.
The further preferable technical scheme is that vacuum grease is coated at the twisting position of the female bullet sheet, the ammonium carbonate micron particles are doped in the vacuum grease, and freezing treatment is needed before experiments.
The structure of the device for testing the speed of the bullet pill for the mechanical experiment of the impact gas gun matched with the bullet pill for the mechanical experiment of the impact gas bubble: a device for testing bullet pill speed in percussion gas gun mechanics experiment is made by communicating front and back of a multi-section pipeline, a tile-shaped speed measuring coil 9 is installed on the speed measuring pipeline, a curved surface formed by the tile-shaped speed measuring coil 9 is parallel to the flight direction of the bullet, positive and negative electrodes 10 are led out of the tile-shaped speed measuring coil 9, and the positive and negative electrodes 10 are connected with a high-speed oscilloscope of peripheral equipment.
In a further preferable technical scheme, a magnetic fluid 11 is annularly installed inside the tile-shaped tachometer coil 9.
The further preferred technical scheme is that the tile-shaped speed measuring coil 9 is installed on a scroll-shaped coil spring 14, the installation route 17 of the tile-shaped speed measuring coil 9 is spirally twisted on the pipeline, the end point of the coil spring 14 is fixed on a metal thin rod 12, the direction of the metal thin rod 12 is parallel to the direction of a gun barrel, a round shaft 13 parallel to the metal thin rod 12 is installed, the other end point 15 of the coil spring is pulled, meanwhile, a bolt a21 is adjusted, and the distance between the metal thin rod 12 and the round shaft 13 is adjustable, so that the size of the inner hollow diameter r in the speed measuring pipeline can be controlled.
Fig. 16 and 17 are typical signals measured using the velocity measuring tube of the present invention, and fig. 16 is a signal measured when a bullet pill passes through the velocity measuring tube, and when the diameter of the velocity measuring tube is large and the magnetic fluid 11 is not installed; FIG. 17 shows the signal measured after tensioning 15; between 1 and 2 in fig. 17 is the time for the bullet to pass two adjacent tile tachometer coils. The comparison of the two figures shows that the experimental effect is greatly improved after the scheme of the invention is adopted.
Example 2
Improvement of a projectile device for impact bubble mechanics experiments:
the difference from example 1 is that the cell 5 is replaced by a sample chamber.
And for the weak magnetic conductor as a bullet, the tile-shaped speed measuring coil 9 is replaced by a superconducting coil, so that the cost is increased (about 10 ten thousand), but the measurement precision is increased.
A bullet for assaulting gas big gun's mechanics experiment, including bullet 1 and female bullet, bullet 1 is wrapped inside female bullet, and female bullet structure is split petal column structure.
The further preferred technical scheme is that the female projectile is of a multi-petal structure, each petal is petal-shaped and is stranded into a whole, the number of petals is 3 to 5, and spiral lines are arranged on the side surface of each petal-shaped projectile.
The further preferable technical proposal is that each segment of spiral line of the female projectile is 2; the top 3 of the female projectile is concave; the bottom 4 of the female bullet is concave, and each petal of the petal-shaped female bullet is internally provided with an Archimedes spiral surface 6; the female projectile is provided with a sample bin for accommodating the sub-projectiles 1.
The further preferable technical scheme is that the parent projectile is made of polycarbonate, and the winding degree of a spiral line formed on the side surface of each petal-shaped projectile of the parent projectile is different.
A further preferable technical scheme is that each petal of the multi-petal type female projectile is provided with a metal layer 7 parallel to the Archimedes spiral surface, the metal layer 7 is arranged at the middle lower part of the inner part of each petal of the female projectile, the thickness of the metal layer 7 is smaller than one fourth of the diameter of the female projectile, and the metal layer 7 is of a structure with a thin upper part and a thick lower part.
The further preferable technical scheme is that vacuum grease is coated at the twisting position of the female bullet sheet, the ammonium carbonate micron particles are doped in the vacuum grease, and freezing treatment is carried out before experiments.
With be used for assaulting the device structure that the pellet complex that the bubble mechanics was tested is used for testing assaulting the bullet pellet speed of the gas cannon mechanics experiment:
the device for testing the speed of the bullet pill in the impact gas gun mechanical experiment is made by communicating a multi-section pipeline front and back, a superconducting coil is arranged on the speed testing pipeline, a curved surface formed by the superconducting coil is parallel to the flight direction of the bullet pill, a positive electrode 10 and a negative electrode 10 are led out of the superconducting coil, and the positive electrode 10 and the negative electrode 10 are connected with a high-speed oscilloscope of peripheral equipment.
Further preferably, the superconducting coil is internally provided with a magnetic fluid 11 in a ring shape.
The further preferred technical scheme is that the superconducting coil is arranged on a scroll-shaped coil spring 14, the mounting route of the superconducting coil is spirally twisted on the pipeline, the end point of the coil spring 14 is fixed on a metal thin rod 12, the direction of the metal thin rod 12 is parallel to the direction of a gun barrel, a round shaft 13 parallel to the metal thin rod 12 is arranged, the other end point 15 of the coil spring 14 is pulled, meanwhile, a bolt a21 is adjusted, the distance between the metal thin rod 12 and the round shaft 13 is adjustable, and the change of the distance is synchronous with the size of the inner hollow diameter r in the speed measuring pipeline. The round shaft 13 is arranged on a bracket 16 outside the speed measuring pipe, and the bracket is arranged on a base 18 capable of adjusting the level.
While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims.
Claims (2)
1. The bullet for the mechanical experiment of the impact gas gun comprises a bullet and a female bullet, and is characterized in that the bullet is coated inside the female bullet, and the female bullet is in a split petal-shaped structure;
the female projectile is of a multi-petal structure, each petal is petal-shaped and is stranded into a whole, the number of petals is 3 to 5, and each petal-shaped side surface of the female projectile is provided with a spiral line;
the female projectile is made of polycarbonate, and the winding degree of the inclination angle of the spiral line of each section is calculated according to the length of the female projectile and the flying speed of the female projectile;
the top of the female projectile is concave inwards; the bottom of the female bullet is concave, and each petal of the petal-shaped female bullet is internally provided with an Archimedes spiral surface; the female projectile is provided with a groove for accommodating the sub-projectiles;
each petal of the multi-petal female projectile is provided with a metal layer parallel to the Archimedes spiral surface, the metal layer is arranged at the middle lower part in each petal of the female projectile, the thickness of the metal layer is less than one fourth of the diameter of the female projectile, and the metal layer is of a structure with a thin upper part and a thick lower part.
2. The projectile for mechanics experiments of percussion air cannons according to claim 1, characterized in that: vacuum grease is coated at the twisted position of the female bullet valve piece, the ammonium carbonate micron particles are doped in the vacuum grease, and freezing treatment is needed before speed measurement.
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| CN110852008B (en) * | 2019-11-05 | 2021-07-13 | 西安交通大学 | Electromagnetic measuring method for projectile velocity in impact extrusion process of countersunk bullet |
| CN112798440A (en) * | 2020-12-28 | 2021-05-14 | 中南大学 | High-speed impact penetration resistance performance testing device and testing method for honeycomb structure |
| CN113465862A (en) * | 2021-07-03 | 2021-10-01 | 中国飞机强度研究所 | Discrete source distributed impact test device and method |
| CN114061383B (en) * | 2021-10-29 | 2023-07-04 | 上海机电工程研究所 | Test simulation method and system for vibration separation under overload condition of primary and secondary bullets |
| CN114754963B (en) * | 2022-06-14 | 2022-08-26 | 中国飞机强度研究所 | Multistage air gun metal diaphragm filling system for airplane high-speed impact power test |
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| CN100370214C (en) * | 2005-04-29 | 2008-02-20 | 哈尔滨工业大学 | Curve shaped bullet holder in autosegregation |
| US9207039B1 (en) * | 2014-05-30 | 2015-12-08 | Michael D. Price | Rapid-firing spear gun with retained projectile |
| CN104729364B (en) * | 2015-03-27 | 2016-07-06 | 西北核技术研究所 | A kind of pneumatic separation bullet holder of light-gas gun |
| CN105547059B (en) * | 2015-12-16 | 2017-05-03 | 哈尔滨工业大学 | Method for realizing sabot pneumatic separation through muzzle cutters |
| CN105973078B (en) * | 2016-05-06 | 2017-11-03 | 西安近代化学研究所 | Bullet separation of the projectile seat device under the big quality bullet high-speed impacts of 5~7kg of one kind |
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