CN109059685B - Device and method for measuring fragment speed in projectile charging - Google Patents
Device and method for measuring fragment speed in projectile charging Download PDFInfo
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- CN109059685B CN109059685B CN201810916412.8A CN201810916412A CN109059685B CN 109059685 B CN109059685 B CN 109059685B CN 201810916412 A CN201810916412 A CN 201810916412A CN 109059685 B CN109059685 B CN 109059685B
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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
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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
- G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
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Abstract
The invention discloses a device and a method for measuring the fragment speed in the explosive loading of a projectile body. Firstly, determining the size parameter of a device according to the test requirement, and pressing a simulated explosive column; then, the sleeve is arranged on the rear end cover, a fourth support body, a fourth simulation medicine, a third support body, a third net target, a third simulation medicine, a second support body, a second net target, a second simulation medicine, a first support body, a first net target, a first simulation medicine and a blocking body are sequentially arranged in the sleeve, a front end cover is arranged at the other end of the sleeve, and the front end cover and the rear end cover are fixed by a screw and a nut to finish the assembly of the device; finally, the assembled device is coaxially arranged in the fragment speed direction, and a timer is connected to measure the speed of the fragments moving in the simulated medicine. The invention has the advantages of clear principle and simple and convenient operation, and can prevent the influence of the deformation of the explosive column and the collapse of the front end cover on the measurement of the tablet breaking speed.
Description
Technical Field
The invention belongs to the field of ammunition safety tests, relates to a fragment speed measuring device and method, and particularly relates to a measuring device and method for testing fragment speed in ammunition charging of a projectile body.
Background
In recent years, with the increasingly harsh environment for using weapons and the large amount of high-value weapons and ammunitions in battlefields, the requirement for the survivability of weapons and ammunitions in battlefields is higher and higher, and the insensitivity of weapons and ammunitions under accidental stimulation has attracted the attention of researchers of weapons and ammunitions in various countries. Ammunition insensitivity test items and evaluation standards are established in succession in the United states and the North America, wherein a high-speed fragment impact test is one of important assessment items of relevant standards. After the high-speed fragment penetrates through the ammunition shell and invades into the explosive charge, the high speed is still kept, and the fragment moving at high speed generates complex stress effects such as compression, friction, shearing and the like on the explosive charge, so that the accidental explosive reaction of the explosive charge is initiated. Therefore, need reduce as far as possible and run through casing back fragment at the inside speed of powder charge, reduce stress action peak value and the effect time between fragment and powder charge to promote the security of projectile body powder charge under the fragment striking, this movement velocity that just needs the inside fragment of accurate measurement projectile body powder charge provides the basis for insensitive ammunition design.
Numerous research works have been carried out at home and abroad aiming at the fragment speed measurement, but no similar published documents and patent reports exist for the fragment speed measurement device and method in the projectile charging. Currently, there are three commonly used methods for measuring the fragment speed: target screening (including target on and target off), flash radiography, and high speed photography all suffer from disadvantages when used to measure the rate of fragmentation within a projectile charge:
(1) the high-speed photography method is only suitable for measuring the fragment speed when no shielding object exists, and the fragment speed under the condition that the fragment is shielded cannot be observed;
(2) when the internal speed of the bomb charge is measured by adopting a target net method, two problems exist, firstly, after fragments penetrate through an ammunition shell at a high speed, the shell is likely to generate phenomena of spalling, collapse and the like, so that the back of the shell generates a large amount of metal fragments, the metal fragments move along with the fragments to impact a speed measurement target net, and the fragment speed measurement is likely to fail;
(3) although the flash X-ray radiography method can record the motion track of the fragments under the condition that the fragments are shielded, and further calculate the speed of the fragments according to the interval distance and time of each image, the measured speed of the fragments has larger error due to smaller size of the fragments, shadow generated during shooting and the like, and meanwhile, the flash X-ray radiography system belongs to high-value instrument equipment, is complex to operate, has high use cost, has higher requirements on the environments such as use temperature, humidity and the like, and is not suitable for places with stronger repeatability and severe use environments (such as field target yards).
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention provides a device and a method for measuring the fragment speed in the bomb charging process.
In order to achieve the measuring purpose, the invention adopts the following technical scheme:
a device and a method for measuring the fragment speed in the projectile charging are characterized in that the measuring device mainly comprises: the device comprises a sleeve, a blocking body, a first simulation medicine, a first net target, a first support body, a second simulation medicine, a second net target, a second support body, a third simulation medicine, a third net target, a third support body, a fourth simulation medicine, a fourth support body, a first screw cap, a front end cover, a rear end cover, a second screw cap and a net target connecting wire; the front end cover and the rear end cover are circular cover plates with grooves in the centers and four through holes uniformly distributed on the outer edges; the sleeve is a cylinder with equal wall thickness, a V-shaped groove is axially arranged on the inner surface of the sleeve, a U-shaped groove is radially arranged at the V-shaped groove at one end of the sleeve, the V-shaped groove and the U-shaped groove are used for leading out a mesh target connecting wire, a fourth supporting body, a fourth simulation medicine, a third supporting body, a third mesh target, a third simulation medicine, a second supporting body, a second mesh target, a second simulation medicine, a first supporting body, a first mesh target, a first simulation medicine and a blocking body are sequentially arranged in the sleeve, the blocking body is arranged at one end close to the front end cover, the sleeve is embedded into grooves of the front end cover and the rear end cover and is coaxially matched with the front end cover and the rear end cover, the screw rods respectively penetrate through holes corresponding to the outer edges of the upper end cover and the;
the measuring principle of the fragment speed inside the projectile body is as follows: according to the test requirements, selecting corresponding device parts and preparing simulated explosive columns with the same diameter and height, and completing the assembly of the device according to the technical scheme, wherein the blocking body is used for blocking the fragments before impactThe support body is used for preventing the deformation of the simulation medicine and ensuring that the distance between the net targets is kept unchanged in the movement process of the fragments in the simulation medicine; then aligning the assembled measuring device to the fragment transmitting device, and installing the fragment transmitting device at a certain distance from the fragment transmitting device; connecting the net target connecting wire to a timer, and setting the timer; the fragment is launched by the fragment launching device, so that the fragment flies to the measuring device, penetrates through the front end cover, continues to advance in the simulated medicine through the central hole of the blocking body, sequentially passes through the first net target, the second net target and the third net target, and the timer sequentially records the time t when the fragment passes through the net targets1、t2、t3Determining the flight time Deltat of the fragment from the first net target to the second net target1＝t2-t1And time of flight Δ t from the second to the third mesh target2＝t3-t2(ii) a Calculating the flying distance L of the fragments from the first net target to the second net target according to the thicknesses of the simulated medicine and the support body1The flying distance L between the second net target and the third net target of the broken piece2(ii) a And finally, calculating the flying speeds of the fragments at different positions of the simulated medicine according to a speed calibration principle.
A device and a method for measuring fragment speed in projectile charging comprise the following steps:
selecting device parts according to test requirements, determining the sizes of the simulated medicines, and preparing a first simulated medicine (6), a second simulated medicine (9), a third simulated medicine (12) and a fourth simulated medicine (15) which have the same diameter and the same height;
step two: according to the selected device part and the prepared simulation medicine in the first step, firstly, a sleeve (5) is installed in a groove of a bottom end cover (17), then a fourth support body (16), a fourth simulation medicine (15), a third support body (14), a third net target (13), a third simulation medicine (12), a second support body (11), a second net target (10), a second simulation medicine (9), a first support body (8), a first net target (7), a first simulation medicine (6) and a blocking body (3) are coaxially installed in a fixed sequence, then an upper end cover (2) is installed, finally, screws are respectively inserted into corresponding outer edge through holes of the upper end cover (2) and the lower end cover (17), and nuts are screwed to complete the assembly of the device;
step three: aligning the assembled measuring device to a fragment launching device, and fixing the fragment launching device on a bullet rack which is spaced from the fragment launching device by 3-5m, so as to ensure that the axis of the measuring device is coincident with the fragment speed direction;
step four: connecting the net target connecting wire to a timer, and setting the timer;
step five: the fragment is launched by the fragment launching device, so that the fragment flies to the measuring device, penetrates through the front end cover (2), continues to advance in the simulated medicine through the central hole of the blocking body (3), sequentially passes through the first net target (7), the second net target (10) and the third net target (13), and the timer sequentially records the time t when the fragment passes through the net targets1、t2、t3Determining the flight time Deltat of the fragment from the first mesh target (7) to the second mesh target (10)1＝t2-t1Determining the flight time Deltat of the fragments from the second net target (10) to the third net target (13)2＝t3-t2；
Step six: the flying distance L of the fragments from the first mesh target (7) to the second mesh target (10) is obtained according to the thicknesses of the simulated medicine and the support body1The flight distance L between the second net target (10) and the third net target (13) of the broken piece2；
Step seven: finally according to the speed calibration principle
And calculating the flying speeds of the fragments at different positions of the simulated medicine.
The invention relates to a device and a method for measuring the fragment speed in the charging of a projectile body, which bring technical effects in the following aspects:
1) according to the invention, the blocking body is additionally arranged between the charge and the shell, so that metal scraps generated due to the cracking, the caving and the like of the back surface of the shell can be effectively resisted, the metal scraps are prevented from impacting the speed measuring target along with the fragments, the failure of fragment speed test is reduced, and the reliability of fragment speed test is improved;
2) the metal support body is arranged behind the speed measuring target, so that the deformation resistance of the charge in the fragment motion process is enhanced, and the fragment speed testing error caused by the position movement of the speed measuring target is effectively avoided;
3) the operation is simple, the use cost is low, and no special requirements are imposed on the use environment.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention.
Fig. 2 is a schematic view of a front end cap according to the present invention.
FIG. 3 is a schematic view of a barrier according to the present invention.
Fig. 4 is a schematic view of a sleeve according to the present invention.
Fig. 5 is a schematic view of a rear end cap according to the present invention.
The reference numerals in the drawings denote:
1. the device comprises a first nut, a second nut, a front end cover, a second nut, a blocking body, a first supporting body, a Y-shaped funnel hole, a second nut, a sleeve, a first simulation medicine, a second simulation medicine, a third supporting body, a fourth.
Detailed Description
The present invention is further described in detail with reference to the drawings and examples, it should be noted that the present invention is not limited to the following examples, and equivalent changes based on the technical scheme of the present invention are within the scope of the present invention.
Following the above technical solution, as shown in fig. 1 to 5, this embodiment provides an apparatus and a method for measuring the fragment speed inside a projectile charge, where the apparatus includes: the kit comprises a sleeve 5, a blocking body 3, a first simulated medicine 6, a first net target 7, a first support body 8, a second simulated medicine 9, a second net target 10, a second support body 11, a third simulated medicine 12, a third net target 13, a third support body 14, a fourth simulated medicine 15 and a fourth support body 16, and is characterized by further comprising a first screw cap 1, a front end cover 2, a rear end cover 17, a second screw cap 18 and a net target connecting wire 19;
the sleeve 5 is a thick-wall cylinder, a V-shaped groove 5-1 is axially formed in the inner surface of the sleeve, a U-shaped groove 5-2 is radially formed in the position of the V-shaped groove at one end of the sleeve 5, the V-shaped groove 5-1 and the U-shaped groove 5-2 are used for leading out a mesh target connecting wire 19, and a fourth supporting body 16, a fourth simulation medicine 15, a third supporting body 14, a third mesh target 23, a third simulation medicine 12, a second supporting body 11, a second mesh target 10, a second simulation medicine 9, a first supporting body 8, a first mesh target 7, a first simulation medicine 6 and a blocking body 3 are sequentially arranged at one end, where a rear end cover 17 is arranged, of the sleeve 5; the blocking body 3 is a cylindrical block with a Y-shaped funnel hole 3-1 at the center, and the outer diameter of the blocking body is equal to the inner diameter of the sleeve 5; the front end cover 2 and the rear end cover 17 are circular cover plates, the centers of the circular cover plates are provided with grooves with slightly larger outer diameters than the sleeve 5, four through holes are uniformly distributed on the outer edges of the circular cover plates, the sleeve 5 is inserted into the grooves to be coaxially matched with the front end cover and the rear end cover, the screw rods 4 respectively penetrate through the through holes corresponding to the outer edges of the upper end cover 2 and the lower end cover 17, and nuts are screwed on to complete the assembly of the device;
the first net target 7, the second net target 10 and the third net target 13 are on-off targets or off-on targets, and the on-off targets are adopted in the embodiment; the outer diameter of the sleeve 5 is 100 mm-150 mm, the height is 200 mm-250 mm, in the embodiment, the outer diameter of the sleeve 5 is 110mm, the height is 250mm, the wall thickness is 5mm, and the material is 45# steel;
the thickness of the front end cover (2) and the rear end cover (17) is 9-16 mm, the depth of the central groove is 3-5mm, in the embodiment, the thickness of the front end cover (2) and the rear end cover (17) is 13mm, and the depth of the central groove is 3 mm;
the device and the method for measuring the fragment speed in the projectile charging are characterized by comprising the following steps:
step one, selecting device parts according to test requirements, determining the size of the simulated medicine, and preparing the simulated medicine with the same diameter and height
A first simulant 6, a second simulant 9, a third simulant 12, a fourth simulant 15;
step two: according to the selected device part and the prepared simulation medicine in the first step, firstly, the sleeve 5 is installed in a groove of a bottom end cover 17, then a fourth supporting body 16, a fourth simulation medicine 15, a third supporting body 14, a third net target 23, a third simulation medicine 12, a second supporting body 11, a second net target 10, a second simulation medicine 9, a first supporting body 8, a first net target 7, a first simulation medicine 6 and a blocking body 3 are coaxially installed in sequence, then the upper end cover 2 is installed, finally, a screw rod is respectively installed in corresponding through holes at the outer edges of the upper end cover 2 and the lower end cover 17, and a nut is screwed on to complete the assembly of the device;
step three: aligning the assembled measuring device to a fragment transmitting device, and installing the measuring device at a certain distance from the fragment transmitting device to ensure that the axis of the measuring device is coincident with the fragment speed direction;
step four: connecting the net target connecting wire to a timer, and setting the timer;
step five: the fragment is launched by the fragment launching device, so that the fragment flies to the measuring device, penetrates through the front end cover 2, continues to advance in the simulated medicine through the central hole of the blocking body 3, sequentially passes through the first net target 7, the second net target 10 and the third net target 13, and the timer sequentially records the time t when the fragment passes through the net targets1、t2、t3Determining the flight time Deltat of the fragment from the first mesh target 7 to the second mesh target 101＝t2-t1，Δt2＝t3-t2；
Step six: the flying distance L of the fragments from the first mesh target 7 to the second mesh target 10 is obtained according to the thicknesses of the simulated medicine and the support body1The flying distance L between the second net target 10 and the third net target 13 of the broken piece2；
Step seven: finally according to the speed calibration principle
And calculating the flying speeds of the fragments at different positions of the simulated medicine.
The following will be illustrated by specific examples:
the specific embodiment of the invention is to measure the speed of a spherical fragment phi 8mm with the speed of 2100m/s moving in PBX plastic bonded explosive after passing through a steel shell with the speed of 10mm, and each part of the selected speed measuring device in the embodiment is as follows: the outer diameter of the sleeve 5 is 110mm, the height is 228mm, the wall thickness is 5mm, and the material is 45# steel; the thickness of the front end cover 2 and the rear end cover 17 is 13mm, and the depth of the central groove is 3 mm; the barrier 3 is made of hard aluminum LY12, the thickness is 10mm, and the central aperture is 12 mm; the first support body 8, the second support body 11, the third support body 14 and the fourth support body 16 are made of duralumin LY12, the thickness is 3mm, and the diameter of a central hole is 12 mm; the first net target 7, the second net target 10 and the third net target 13 are enameled wires and woven into on-off targets, and the thickness is 2 mm; the present embodiment employs light gas guns to accelerate the fragmentation to a specific speed.
Firstly, determining the size of a simulated medicament to be phi 100 multiplied by 50mm according to the size of a device part selected according to test requirements, and preparing a first simulated medicament 6, a second simulated medicament 9, a third simulated medicament 12 and a fourth simulated medicament 15 which have the same diameter and the same height by adopting a die press-fitting method;
step two: according to the selected device components and the prepared simulation medicine, firstly, a sleeve 5 is installed in a groove of a bottom end cover 17, then a fourth supporting body 16, a fourth simulation medicine 15, a third supporting body 14, a third net target 23, a third simulation medicine 12, a second supporting body 11, a second net target 10, a second simulation medicine 9, a first supporting body 8, a first net target 7, a first simulation medicine 6 and a blocking body 3 are coaxially installed in sequence, then an upper end cover 2 is installed, finally, a screw rod is respectively installed in corresponding through holes at the outer edges of the upper end cover 2 and the lower end cover 17, and a nut is screwed on the screw rod to complete the assembly of the speed measuring device;
step three: aligning the assembled measuring device to a fragment launching gun barrel, and installing the measuring device in an explosion-proof tank of a light gas gun to ensure that the axis of the measuring device is coincident with the fragment speed direction;
step four: connecting the net target connecting wire to a timer, and setting the timer;
step five: setting the launching parameters of the light gas gun, loading the fragments to enable the fragments to fly to the measuring device, penetrate through the front end cover 2, continue to advance in the simulated medicine through the central hole of the blocking body 3, sequentially pass through the first net target 7, the second net target 10 and the third net target 13, and sequentially record the time t when the fragments pass through the net targets by the timer1、t2、t3Determining the flight time Deltat of the fragment from the first mesh target 7 to the second mesh target 101＝t2-t1，Δt2＝t3-t2The time recorded by the timer is t1＝0us,t2＝27.2us,t3＝55.3us,Δt1＝27.2us,Δt2＝28.1us；
Step six: the flying distance L of the fragments from the first mesh target 7 to the second mesh target 10 is obtained according to the thicknesses of the simulated medicine and the support body1Flight distance L between the second mesh target 10 and the third mesh target 13 of the broken piece is 53mm2＝53mm；
Step seven: finally according to the speed calibration principle
Calculating the flying speed of the fragments at different positions of the simulated medicine, and the average speed of the fragments passing through the first mesh target 7 to the second mesh target 10
Average speed of fragments passing through the second mesh target 10 to the third mesh target 13
The fragment speed required by the same test as that of the embodiment 1 is measured for 3 times by adopting the measuring device, and the time recorded by the timer is measured for three times, namely for the first time: t is t11＝0us,t12＝27.1us,t1355.35us, Δ t 1us, Δ t 2us, 28.25 us; and (3) for the second time: t is t21＝0us,t22＝27.4us,t2355.6us, 27.4us and 28.2us respectively as Δ t1 and Δ t 2; and thirdly: t is t31＝0us,t32＝26.9us,t3355.2us, 26.9us and 28.3us respectively as Δ t1 and Δ t 2; the average speed of the fragments passing through the first mesh target 7 to the second mesh target 10 is v11＝1955.7m/s，v21＝1934.3m/s，v311920.3 m/s; the average speed of the fragments passing through the second mesh target 10 to the third mesh target 13 is v12＝1859.6m/s，v22＝1879.4m/s，v321872.8 m/s. The test errors of the average speed of the fragments passing through the first mesh target 7 to the second mesh target 10 are respectively as follows: 0.36%, 0.73%, 1.48%; the test errors of the average speed of the fragments passing through the second mesh target 10 to the third mesh target 13 are respectively as follows: 1.43 percent, 0.36 percent and 0.69 percent, the speed of the fragment is accurately measured by three measurements,the success rate and the measurement precision of the fragment speed measurement are improved.
Claims (7)
1. A device for measuring the fragment speed in projectile charging is characterized by mainly comprising a sleeve (5), a blocking body (3), a first simulation medicine (6), a first net target (7), a first support body (8), a second simulation medicine (9), a second net target (10), a second support body (11), a third simulation medicine (12), a third net target (13), a third support body (14), a fourth simulation medicine (15) and a fourth support body (16), and further comprising a first screw cap (1), a front end cover (2), a rear end cover (17), a second screw cap (18) and a net target connecting wire (19); the front end cover (2) is a circular cover plate with a groove (2-1) at the center and four through holes (2-2) uniformly distributed at the outer edge; the rear end cover (17) is a circular cover plate with a groove (17-1) in the center and four through holes (17-2) uniformly distributed on the outer edge; the sleeve (5) is a cylinder with equal wall thickness, the inner surface of the sleeve (5) is provided with a V-shaped groove (5-1), the V-shaped groove at one end of the sleeve (5) is provided with a U-shaped groove (5-2) along the radial direction, a fourth support body (16), a fourth simulation medicine (15), a third support body (14), a third net target (13), a third simulation medicine (12), a second support body (11), a second net target (10), a second simulation medicine (9), a first support body (8), a first net target (7), a first simulation medicine (6) and a blocking body (3) are arranged in the sleeve (5) according to a fixed sequence, wherein the blocking body (3) is arranged at one end close to the front end cover (2), the sleeve (5) is embedded into a groove (17-1) of the rear end cover (17) and a groove (2-1) of the front end cover (2) and is fixed between the front end cover (2) and the rear end cover (17), the sleeve (5) is coaxially matched with the front end cover (2) and the rear end cover (17); the blocking body (3) is a cylindrical block with a Y-shaped funnel hole (3-1) at the center, and the outer diameter of the blocking body is equal to the inner diameter of the sleeve (5); the first support body (8), the second support body (11), the third support body (14) and the fourth support body (16) are all round aluminum sheets with central holes; the screw (4) is inserted into a through hole corresponding to the outer edge of the front end cover (2) and the outer edge of the rear end cover (17), and a first nut (1) and a second nut (18) for fixing the whole device are installed at the two ends of the screw (4).
2. A projectile charge internal fragmentation rate measurement device as claimed in claim 1 wherein: the first net target (7), the second net target (10) and the third net target (13) are on-off targets or off-on targets.
3. A projectile charge internal fragmentation rate measurement device as claimed in claim 1 wherein: the diameter of the sleeve (5) is 100 mm-150 mm, and the height is 200 mm-250 mm.
4. A projectile charge internal fragmentation rate measurement device as claimed in claim 1 wherein: the front end cover (2) and the rear end cover (17) are equal in diameter, and the diameter is 2.0-2.3 times of the outer diameter of the sleeve (5).
5. A projectile charge internal fragmentation rate measurement device as claimed in claim 1 wherein: the thickness of the front end cover (2) and the rear end cover (17) is 9-16 mm, and the depth of the central groove is 3-5 mm.
6. A device for measuring the speed of fragments inside a projectile charge according to claim 1, characterized in that the central holes of the blocking body (3), the first support (8), the second support (11), the third support (14) and the fourth support (16) have a diameter which is 3-5mm larger than the size of the fragments and are coaxially mounted with each other.
7. A method for measuring the speed of fragments inside a projectile charge according to claim 1, comprising the steps of:
selecting device parts according to test requirements, determining the sizes of the simulated medicines, and preparing a first simulated medicine (6), a second simulated medicine (9), a third simulated medicine (12) and a fourth simulated medicine (15) which have the same diameter and the same height;
step two: according to the selected device part and the prepared simulation medicine in the first step, firstly, a sleeve (5) is embedded into a groove (17-1) of a rear end cover (17), then a fourth support body (16), a fourth simulation medicine (15), a third support body (14), a third net target (13), a third simulation medicine (12), a second support body (11), a second net target (10), a second simulation medicine (9), a first support body (8), a first net target (7), a first simulation medicine (6) and a blocking body (3) are coaxially installed in sequence, then a front end cover (2) is installed, finally, a screw rod is respectively inserted into outer edge through holes corresponding to the front end cover (2) and the rear end cover (17), and a screw cap is screwed on to complete the assembly of the device;
step three: aligning the assembled measuring device to a fragment launching device, and fixing the fragment launching device on a bullet rack which is spaced from the fragment launching device by 3-5m, so as to ensure that the axis of the measuring device is coincident with the fragment speed direction;
step four: connecting the net target connecting wire to a timer, and setting the timer;
step five: the fragment is launched by the fragment launching device, so that the fragment flies to the measuring device, penetrates through the front end cover (2), continues to advance in the simulated medicine through the central hole of the blocking body (3), sequentially passes through the first net target (7), the second net target (10) and the third net target (13), and the timer sequentially records the time t when the fragment passes through the net targets1、t2、t3Determining the flight time Deltat of the fragment from the first mesh target (7) to the second mesh target (10)1＝t2-t1Time of flight Deltat from the second mesh target (10) to the third mesh target (13)2＝t3-t2；
Step six: the flying distance L of the fragments from the first mesh target (7) to the second mesh target (10) is obtained according to the thicknesses of the simulated medicine and the support body1The flight distance L between the second net target (10) and the third net target (13) is broken2；
Step seven: finally according to the speed calibration principle
And calculating the flying speeds of the fragments at different positions of the simulated medicine.
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| DE3702428A1 (en) * | 1987-01-28 | 1988-08-11 | Rheinmetall Gmbh | Method and device for detecting, in terms of metrology, a projectile or parts thereof |
| CN102749470A (en) * | 2012-07-03 | 2012-10-24 | 南京理工大学 | Fragment velocity measuring device |
| CN103206986B (en) * | 2013-04-10 | 2015-11-18 | 中北大学 | A kind of high-speed moving object parameter test system and method |
| CN107870249B (en) * | 2017-10-17 | 2019-09-10 | 西安工业大学 | A kind of cylindrical surface light curtain speed measuring device and its speed-measuring method |
| CN107894514A (en) * | 2017-11-07 | 2018-04-10 | 湖北航天化学技术研究所 | A kind of speed measuring device and method of explosion driving fragmentation |
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