Intensive fragment speed and scattering characteristic measuring device based on array comb-shaped target

Abstract

The utility model provides a dense fragment speed and scattering characteristic measuring device based on an array comb-shaped target, which comprises a mounting bracket, an array module and a test terminal, the array module is mounted on the mounting bracket to form a measuring target, the array module is provided with an array unit, and the array unit is connected with the test terminal. The test terminal comprises an external trigger module, a data acquisition and storage module and an export module, the external trigger module is installed on an array unit, the array unit comprises a signal grid and a power grid, the signal grid is provided with a signal output port, the signal output port is connected with the data acquisition and storage module through a signal line, and the data acquisition and storage module is connected with the export module. The data acquisition and storage module is connected with the export module, a power supply grid is provided with a power supply input port, the power supply input port is connected with a power supply through a power line, and the test target comprises a front target and a rear target. And the capture rate and the measurement precision of the target fragment of the explosion field are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the measurement of the velocity and scattering characteristic of explosion field fragments, in particular to the measurement device of the velocity and scattering characteristic of dense fragments based on array comb target. BACKGROUND

[0002] The contact type measurement is one of the commonly used methods for measuring the velocity of fragments, which realizes the velocity measurement through the direct contact between the fragments and the area intercept device and the fixed distance timing principle, and the commonly used test methods are comb target, aluminum foil target, net target method and the like. Among them, the metal wire used in the net target is usually copper wire, which is simple to manufacture and has no special requirements on the material of the fragments, but the string net target can only measure the velocity of the first fragment hitting the target, and the velocity measurement accuracy of the string net target is poor; the aluminum foil target and the comb target belong to the break-through target, and the circuit is in the off state before the fragments penetrate the target, and when the fragments contact the target plate, the circuit is turned on and a signal is generated, which meets the requirements of the velocity measurement of the explosion field fragments, but there are problems such as small number of obtained fragments, inability to realize the velocity measurement of a large number of fragments, and the like, and the aluminum foil target is easy to be damaged in the explosion field and the like due to its soft texture. The commonly used vertical target mode for measuring the velocity of fragments includes plane target and rectangular target, however, in the field test, the vertical target of the rectangular target is difficult, and the space error between adjacent target surfaces is large, so the test workload is large, and the plane target is usually used to measure the velocity of fragments, which cannot realize the integrated measurement of the velocity of fragments, the scattering angle, the distribution density and other parameters of fragments by the fast vertical target of the rectangular target. In addition, when the double area intercept velocity measurement is used, due to the unpredictability of the movement method of the fragments, it is difficult to accurately distinguish the same fragments penetrating the front and rear area intercept devices according to the test data, and there is a certain error in the matching of the same name fragments, which greatly affects the accuracy of the test results. CONTENT OF THE UTILITY MODEL

[0003] To solve the above technical problems, the utility model provides a measurement device of the velocity and scattering characteristic of dense fragments based on array comb target, which can realize the integrated measurement of the velocity, the scattering angle, the distribution density and other parameters of the dense fragments in the explosion field by designing an array unit of array comb target with adjustable size and shape, and provides an accurate matching method of the same name fragments of the front and rear measurement targets when the double area intercept velocity measurement is used, thereby improving the capture rate and the measurement accuracy of the fragments hitting the target in the explosion field.

[0004] To achieve the above purpose, the utility model adopts the technical scheme that:

[0005] The array comb target-based dense fragment velocity and scattering characteristic measuring device is characterized by comprising a mounting bracket, an array module and a test terminal, the array module is installed on the mounting bracket to form a measuring target, the array module is provided with position-adjustable, independent and coded array units, the test terminal comprises an external trigger module, a data acquisition and storage module and an export module, the external trigger module is installed on the array units, the array units comprise a signal grid and a power grid, the signal grid is provided with a signal output port, the signal output port is connected with the data acquisition and storage module through a signal line, the data acquisition and storage module is connected with the export module, the power grid is provided with a power input port, the power input port is connected with a power supply through a power line, the signal grid and the power grid are distributed in a comb shape, the distance d2 between adjacent same grids is twice the distance d1 between adjacent different grids, the distance d2 between adjacent same grids is not greater than the minimum size of the measured fragment, that is, when the minimum size of the measured fragment is D min , the distance d1 between adjacent different grids satisfies d1≤0.5·D min , the distance between adjacent different grids is not greater than the size of the measured fragment, before and after the fragment penetrates the target, the different grids are not connected, and the circuit on the array unit is in an open circuit state; when the fragment hits the target, the different grids on the array unit are connected by the fragment to generate a pulse signal, and the pulse signal is transmitted to the external trigger module through the signal line,

[0006] The test target comprises a front target installed on the front end face of the mounting bracket and a rear target installed on the rear end face of the mounting bracket, when the double-zone intercepting method is used to measure the fragment velocity, a measurement coordinate system is established, the lower left vertex of the explosion center surface of the measuring target face is taken as the coordinate origin, the straight line parallel to the target edge is taken as the x1 and x2 axes, and the vertical upward direction is taken as the y1 and y2 axis positive directions; the explosion center coordinate system takes the projection point of the predetermined explosion center on the ground as the coordinate origin O, the straight line perpendicular to the target surface is taken as the Y axis, the straight line parallel to the target surface and the ground is taken as the X axis, and the vertical upward direction is taken as the Z axis positive direction,

[0007] Since the predetermined explosion center is located on the positive half of the Z axis, the target surfaces of the front target and the rear target are parallel to the XOZ plane, the distance between the front target and the XOZ plane is D0, and the distance between the front target and the rear target is D1, the equations of the target surfaces of the front target and the rear target are Y=D0 and Y=D0+D1 respectively, the line connecting the centers of the front target and the rear target is parallel to the Y axis, and the shapes and sizes of the two targets are kept consistent, the flight time of the fragment to the front target is less than that to the rear target, therefore, the registration of the point set should satisfy the following collinear condition, distance equal proportion condition and hitting target time sequence condition:

[0008]

[0009] In the formula, (x p1 ,y p1 ) represents the hitting target coordinates of the fragment on the front target; (xp0 ,y p0 ) and (x p2 ,y p2 (x) represents the coordinates of the projected points of the rear target impact points of the predetermined explosion center and fragments onto the front target, respectively. p2 ,y p2 ) is also the target impact coordinate of the fragment on the rear target; t p1 t p2 These are the flight times of the fragments to the front and rear targets, respectively.

[0010] In the above structure: the dense fragment velocity and scattering characteristics measurement device based on an array-type comb target proposed in this utility model includes a mounting bracket, an array module, and a test terminal. The array module is mounted on the mounting bracket to form a measurement target. Multiple independent test units are set on the array module, with each independent test unit being an array unit. The measurement target consists of m array modules, and each array module has n array units, resulting in m×n array units. The array module is composed of array units arranged in an m1×n1 array, where m1 and n1 represent the number of array units in the column and row directions, respectively. The column width and row height of the array module are n1L and m1L, respectively. When the fragment distribution density is ρ... k The proposed array module has a measured area of ​​S. zl When the area is square meters, the number of array units contained in the array module must be no less than ρ. k S zl .

[0011] The array unit's gates are divided into two categories: signal gates and power gates. These gates are arranged in a comb-like pattern, with the spacing d2 between adjacent gates of the same type being twice the spacing d1 between adjacent gates of different types. To ensure that no fragments are missed during array unit testing, the spacing d2 between adjacent gates of the same type must not exceed the minimum size of the fragment being tested. That is, when the minimum size of the fragment being tested is D... min The spacing d1 between adjacent heterogeneous gates must satisfy d1≤0.5·D min According to actual testing requirements, the spacing between adjacent dissimilar gates should not exceed the size of the fragment under test, and the resolution of the array unit should meet the testing requirements. Before and after the fragment penetrates the target, the dissimilar gate is not connected, and the circuit is in an open circuit state; when the fragment hits the target, the dissimilar gate is connected by the fragment to generate a pulse signal.

[0012] The test terminal comprises an external trigger module, a data acquisition and storage module and an export module, the external trigger module is installed on the array unit, the array unit comprises a signal grid and a power grid, a signal output port is arranged on the signal grid, the signal output port is connected with the data acquisition and storage module through a signal line, and the data acquisition and storage module is connected with the export module. At the moment of explosion of the warhead, the external trigger module generates a trigger signal and transmits the trigger signal to each data acquisition and storage module, the data acquisition and storage module starts timing, starts collecting the output signals of each array unit, and stores the coded data containing the hitting time and position of the fragments. The timing data (the time difference from the generation of the trigger signal to the moment of hitting of the fragments) in the data acquisition and storage module is exported by using the export module, and the speed of the fragments is calculated according to the coded data of the array unit and the flight distance of the fragments. The positions of the array units can be self-defined before the test, and the corresponding relationship between the positions of the array units and the codes of the hitting fragments in the data acquisition and storage module is determined.

[0013] According to the codes of the hitting time and position of the fragments saved by the data acquisition and storage module, the flight time and position of the hitting fragments can be obtained, the speed of the fragments can be further calculated by measuring the distance from the explosion center to the hitting position, and the results such as the scattering angle and distribution density of the fragments can be calculated according to the established coordinate system, the position and number of the hitting fragments.

[0014] When the two-zone intercept method is used to measure the speed of the fragment, due to the unpredictability of the direction of the fragment movement, the fragment hitting points of the front and rear targets are difficult to directly correspond, and the hitting time sequence is difficult to accurately distinguish the data belonging to the same fragment, so the utility model provides a front and rear measurement target same name fragment accurate matching problem. When the point set registration is carried out, first, the coordinate system is established, the left lower vertex of the measurement target surface facing the explosion center surface is taken as the coordinate origin, the straight line parallel to the target edge is taken as the x1 and x2 axes, and the vertical upward is taken as the y1 and y2 axes positive direction; the explosion center coordinate system takes the projection point of the predetermined explosion center on the ground as the coordinate origin O, the straight line perpendicular to the target surface is taken as the Y axis, the straight line parallel to the target surface and the ground is taken as the X axis, and the vertical upward is taken as the Z axis positive direction. Since the predetermined explosion center is located on the positive half of the Z axis, the target surfaces of the front and rear targets are parallel to the XOZ plane, the distance between the front target and the XOZ plane is D0, and the distance between the front and rear targets is D1, so the equations of the planes where the target surfaces of the front and rear targets are located are Y=D0 and Y=D0+D1 respectively. In order to ensure the accuracy of the point set registration, the line connecting the centers of the front and rear targets should be parallel to the Y axis, and the shapes and sizes of the two targets should be kept consistent. Since the trajectory of the fragment can be approximated as a straight line, and the target surfaces of the front and rear targets are parallel to each other, the front target hitting point of the fragment, the explosion center and the rear target hitting point on the projection point of the front target should approximately satisfy the collinear relationship, and the distance ratio between the front target hitting point and the two projection points should be approximately equal to the distance ratio between the front target and the explosion center and the rear target. In addition, the flight time of the fragment to the front target should be less than the time to the rear target. Therefore, the registration of the point set should satisfy the following collinear conditions, distance equal proportion conditions and hitting time sequence conditions:

[0015]

[0016] In the formula: (x p1 ,y p1 ) represents the hitting coordinates of the fragment on the front target; (x p0 ,y p0 ) and (x p2 ,y p2 ) are respectively the projection point coordinates of the predetermined explosion center and the rear target hitting point of the fragment on the front target, (x p2 ,y p2 ) is also the hitting coordinates of the fragment on the rear target; t p1 , t p2 are respectively the flight times of the fragment to the front and rear targets. Taking D0=5D1 as an example, when the number of fragments is large, for individual fragments, there may be more than one group of point sets that meet the conditions. In order to improve the registration accuracy of the point set, the linear fitting degree and the relative error of the distance ratio of the related point sets are calculated, and the point set with high fitting degree and small relative error is taken as the hitting point set of the fragment.

[0017] Further, the installation support comprises a base frame and an array installation frame, the array installation frame is installed on the base frame through the standard installation frame, and the array module is installed on the array installation frame.

[0018] In the structure, in order to realize quick vertical target of the rectangular measurement target of the explosion field, a frame structure is used as a basis for installation, first, an installation support is made of aluminum alloy profiles, etc., among which, the array installation frame is made according to a unit measurement area as a basis, on-site quick splicing of each frame can be realized according to test requirements, the test target is installed on the array installation frame, and the standard installation part is used to realize quick installation on the base frame.

[0019] Further, the array installation support is provided with a groove, and the power line and the signal line are arranged in the groove.

[0020] Further, the array unit is connected with the data acquisition and storage module through a shielding line, and the shielding line is arranged in the groove.

[0021] In the structure, in order to ensure the safety of wiring, the signal line, the power line and the shielding line are placed in the groove, so as to prevent being directly hit by fragments, in order to reduce the influence of the lead on the test, the power line and the signal line are arranged along the boundary of the array unit, and under the maximum allowable current, the size of the lead is set to be minimum, in order to reduce the wiring workload, the socket is arranged on the lead surface, and the multi-core shielding line is used to connect the array module and the acquisition and storage module, so that the required wiring amount is consistent with the number of array modules, the shielding line is used to reduce the influence of strong electromagnetic interference generated by explosion on signal transmission, the socket comprises a power connection position and a plurality of signal connection positions, the number of signal connection positions is consistent with the number of array units contained in the array module, the connection position serial number is one-to-one corresponding to the position serial number of the array unit, and in addition, since the straight plug socket is not conducive to the grid arrangement of the measurement surface, the patch socket is selected.

[0022] Further, the array module is made of a PCB circuit board with FR-4 as a base material, and the array units in a number range are arranged in a PCB circuit board according to the corresponding relationship of the grid spacing requirements and the position and serial number, and the combined PCB board is used as the array module.

[0023] In the structure, in order to improve the manufacturing efficiency of the array module, a PCB circuit board with FR-4 as the substrate is used for manufacturing, and the array units in a number range are arranged in a PCB circuit board according to the corresponding relationship of the gate interval requirements and positions and serial numbers, and the combined PCB board is used as the array module. In the waterproof insulation aspect, waterproof and moisture-proof are realized from the root by spraying the solder resist ink, and the insulation impedance between the two types of gates is improved, and the waterproof and moisture-proof performance is further improved by spraying the nano waterproof coating on the surface of the PCB circuit board.

[0024] Further, the measuring targets are respectively combined by three plane targets in a rectangular form, and the plane targets on both sides and in the middle are respectively spliced by the array modules in i x j1 and i x j2 arrays, wherein i represents the number of array modules in the column direction of the measuring targets on both sides and in the middle, j1 and j2 respectively represent the number of array modules in the row direction of the measuring targets on both sides and in the middle, the width l1 and the height h zl of the measuring targets on both sides are respectively j1n1L and im1L, the width l2 and the height h zl of the measuring targets in the middle are respectively j2n1L and im1L, the axial angle range of the measuring targets can reach 0°-180°, and the corresponding relationship between the position serial number and the position of the array modules of the measuring targets is as follows:

[0025]

[0026] In the formula, k mk represents the position serial number of the array module in the measuring target, a1, a2 and a3 respectively represent the row positions of the array module in the left, middle and right three regions of the measuring target, and b1, b2 and b3 respectively represent the column positions of the array module in the left, middle and right three regions of the measuring target.

[0027] Further, the plane shape of the array unit is a square, when the fragment distribution density examination index is p, the fragment scattering angle examination index is Omega k , the test allowable error is w, and the specified test distance is R fs , the size L of the array unit needs to meet the following conditions:

[0028]

[0029] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0030] The dense fragment velocity and scattering characteristic measuring device based on the array type comb-shaped target can realize adjustable array unit size and adjustable measuring target area according to test environment, test conditions and the like, compared with the traditional vertical target method, can realize fast vertical target of the rectangular measuring target, meets integrated measurement of the velocity and scattering characteristic of the dense fragment group, can realize accurate matching of the same-name fragments of front and rear measuring targets when adopting double-zone intercept velocity measurement, accurately measures the fragment velocity, and improves test precision. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is an array unit structure schematic view of the array type comb-shaped target in the utility model

[0032] Figure 2 It is a rectangular array type comb-shaped measuring target field layout schematic view in the utility model

[0033] Figure 3 It is an array type comb-shaped target field installation schematic view when double-zone intercept velocity measurement in the utility model

[0034] Figure 4 It is a coordinate system establishment schematic view when double-zone intercept measurement in the utility model

[0035] Figure 5 It is a same-name fragment point set registration front and rear schematic view of front and rear measuring targets when double-zone intercept velocity measurement in the utility model.

[0036] LIST OF REFERENCE NUMERALS

[0037] 1, array module;11, array unit;2, mounting bracket;3, groove;4, standard mounting piece;5, front target;6, rear target;7, fragment one;8, fragment two;9, fragment three;a, signal gate;B, signal output port;C, power supply gate;D, power supply input port. DETAILED DESCRIPTION

[0038] The utility model will be further described in detail in combination with the drawings and specific embodiments:

[0039] For example, Figures 1-5The utility model discloses a dense fragment velocity and scattering characteristic measuring device based on array comb target, including mounting support 2, array module 1 and test terminal, array module 1 is installed on mounting support 2 and forms measurement target, be provided with adjustable position, independent and have the array unit 11 of coding on array module 1, the test terminal includes external trigger module, data acquisition and storage module and export module, external trigger module is installed on array unit 11, array unit 11 includes signal grid pole a and power supply grid pole c, be provided with signal output port b on signal grid pole a, signal output port b is connected data acquisition and storage module through signal line, data acquisition and storage module connects export module, be provided with power input port d on power supply grid pole c, power input port d is connected power supply through power supply line, signal grid pole a and power supply grid pole c are distributed as comb teeth, the spacing d2 of adjacent similar grid pole is twice the spacing d1 of adjacent dissimilar grid pole, the spacing d2 of adjacent similar grid pole is not more than the minimum size of the measured fragment, that is when the minimum size of the measured fragment is D min , adjacent dissimilar grid pole spacing d1 needs to satisfy d1≤0.5·D min , the spacing between adjacent dissimilar grid poles is not more than the size of the measured fragment, before and after the fragment penetrates the target, the dissimilar grid poles are not connected, and the circuit on the array unit 11 is in an open circuit state, when the fragment hits the target, the dissimilar grid poles on the array unit 11 are connected by the fragment to generate a pulse signal, and the pulse signal is transmitted to the external trigger module through the signal line,

[0040] The test target includes a front target 5 installed on the front end face of the mounting support 2 and a rear target 6 installed on the rear end face of the mounting support 2, when the double-zone intercept method is used to measure the speed of the fragment, a measurement coordinate system is established, the lower left vertex of the measurement target facing the explosion center is taken as the coordinate origin, the straight line parallel to the target edge on the ground is taken as the x1 and x2 axes, and the vertical upward direction is taken as the positive direction of the y1 and y2 axes, the explosion center coordinate system takes the projection point of the predetermined explosion center on the ground as the coordinate origin O, the vertical line perpendicular to the target surface is taken as the Y axis, the straight line parallel to the target surface and the ground is taken as the X axis, and the vertical upward direction is taken as the positive direction of the Z axis,

[0041] Since the predetermined explosion center is located on the positive half of the Z axis, the target surfaces of the front target 5 and the rear target 6 are parallel to the XOZ plane, the distance between the front target 5 and the XOZ plane is D0, and the distance between the front target 5 and the rear target 6 is D1, so the equations of the target surfaces of the front target 5 and the rear target 6 are Y=D0 and Y=D0+D1 respectively, the line connecting the centers of the front target 5 and the rear target 6 is parallel to the Y axis, and the shapes and sizes of the two targets are kept consistent, the flight time of the fragment to the front target 5 is less than the flight time to the rear target 6, therefore, the registration of the point set should satisfy the following collinear condition, distance equivalent condition and hitting target time sequence condition:

[0042]

[0043] In the formula: (x p1,y p1 (x) represents the impact coordinates of the fragment on the front target 5; p0 ,y p0 ) and (x p2 ,y p2 (x) represents the coordinates of the projection points of the rear target 6, where the predetermined impact point of the explosion center and fragments are located, onto the front target 5. p2 ,y p2 This is also the target coordinate of the fragment on the rear target 6; t p1 t p2 These are the flight times of the fragments to the front target 5 and the rear target 6, respectively.

[0044] It also includes a standard mounting component 4. The mounting bracket 2 includes a base frame and an array mounting frame. The array mounting frame is mounted on the base frame via the standard mounting frame, and the array module 1 is mounted on the array mounting frame.

[0045] The array mounting bracket 2 is provided with a groove 3, and the power line and signal line are arranged in the groove 3.

[0046] It also includes a shielding wire, and the array unit 11 is connected to the data acquisition and storage module through the shielding wire, which is arranged in the groove 3.

[0047] The array module 1 is made using a PCB circuit board with FR-4 substrate, and array units 11 that meet the number range are arranged in a PCB circuit board according to the gate pitch requirements and the correspondence between position and serial number. This combined PCB board is used as the array module 1.

[0048] like Figure 2 As shown, the measuring target is composed of three planar targets arranged in a rectangular pattern. The two side and middle planar targets are respectively composed of array modules 1 arranged in i×j1 and i×j2 arrays, where i represents the number of array modules 1 in the column direction on both sides and the middle of the measuring target, and j1 and j2 represent the number of array modules 1 in the row direction on both sides and the middle of the measuring target, respectively. The width l1 and height h of the two sides of the measuring target are... zl They are j1n1L and im1L respectively, with the width l2 and height h in the middle. zl They are j2n1L and im1L respectively, by Figure 2 It can be seen that the axial angle range of the rectangular measuring target can reach 0° to 180°. The correspondence between the position number and position of the array module 1 of the rectangular measuring target is as follows:

[0049]

[0050] In the formula: k mkArray module 1 represents the position sequence number in the measuring target; a1, a2, a3 respectively represent the row position of array module 1 in the left, middle and right three areas of the measuring target; b1, b2, b3 respectively represent the column position of array module 1 in the left, middle and right three areas of the measuring target.

[0051] The plane shape of the array unit 11 is a square, when the fragment distribution density examination index is p, and the fragment scattering angle examination index is Omega k , the test allowable error is w, and the specified test distance is R fs , the size L of the array unit 11 needs to meet the following conditions:

[0052]

[0053] The size of the conventional comb-shaped target commonly used in the explosion field at present is 50cm*50cm~100cm*100cm, in order to facilitate the splicing between the array units 11, the array unit 11 of the array comb-shaped target provided by the utility model is a square, the size can be set to 1cm~10cm adjustable according to requirements, the fragment hitting target position is recorded as the center position of the array unit 11, compared with the conventional comb-shaped target, the measurement precision of the fragment hitting target position is greatly improved; the array unit 11 is connected with the data acquisition channel one by one, so that the simultaneous measurement of the fragment hitting target position and the time can be realized; the divided whole (or large area) comb-shaped target is spliced in the array form to form a measurement similar to the target plate method.

[0054] The array module 1 is installed on the mounting bracket 2, so that it forms a measuring target, a plurality of independent test units are arranged on the array module 1, a single independent test unit is an array unit 11, the measuring target is composed of m array modules 1, one array module 1 has n array units 11, so that there are m*n array units 11 in the measuring target, the array module 1 is combined by the array units 11 in m1*n1 arrays, m1 and n1 respectively represent the number of array units 11 in the column direction and the row direction, so that the column width and the row height of the array module 1 are n1L and m1L respectively, when the fragment distribution density is p k , the designed array module 1 measurement area is S zl square meters, so that the number of array units 11 contained in the array module 1 needs to be not less than p k S zl .

[0055] For example Figure 1As shown, the gate of the array unit 11 is divided into two types of signal gate a and power gate c, and the two types of gates are distributed in a comb shape, and the distance d2 between adjacent gates of the same type is twice the distance d1 between adjacent gates of different types. In order to ensure that there is no missed fragment in each part of the array unit 11, the distance d2 between adjacent gates of the same type should not be greater than the minimum size of the measured fragment, that is, when the minimum size of the measured fragment is D min , the distance d1 between adjacent gates of different types should satisfy d1≤0.5·D min . According to the actual test requirements, the distance between adjacent gates of different types should not be greater than the size of the measured fragment, and the resolution of the array unit 11 can meet the test requirements. Before and after the fragment penetrates the target, the gates of different types are not connected, and the circuit is in an open state; when the fragment hits the target, the gates of different types are connected by the fragment to generate a pulse signal.

[0056] The test terminal includes an external trigger module, a data acquisition and storage module, and an export module. The external trigger module is installed on the array unit 11, the array unit 11 includes signal gates a and power gates c, the signal gates a are provided with signal output ports b, the signal output ports b are connected to the data acquisition and storage module through signal lines, and the data acquisition and storage module is connected to the export module. At the moment of explosion of the warhead, the external trigger module generates a trigger signal and transmits it to each data acquisition and storage module, the data acquisition and storage module starts timing, starts collecting the output signals of each array unit 11, and stores the encoded data containing the hitting time and position of the fragment. The timing data (the time difference from the generation of the trigger signal to the moment when the fragment hits the target) in the data acquisition and storage module is exported by the export module, and the speed of the fragment is calculated according to the encoded data of the array unit 11 and the flight distance of the fragment. The positions of the array unit 11 can be self-defined before the test to determine the correspondence between the positions of the array unit 11 and the encoded data of the fragments hitting the target in the data acquisition and storage module.

[0057] According to the encoded data of the hitting time and position of the fragment saved by the data acquisition and storage module, the flight time and position of the hitting fragment can be obtained, the speed of the fragment can be further calculated by measuring the distance from the explosion center to the hitting position, and the results such as the scattering angle and distribution density of the fragments can be calculated according to the established coordinate system, the position and number of the hitting fragments, etc.

[0058] The installation diagram of the array type measurement target for double-zone interception speed is shown in Figure 3 The measurement area of the single-face measurement target and the distance between the front and rear measurement targets can be determined according to actual test requirements, and the installation frame can be used to realize rapid installation.

[0059] When the two-zone intercept method is used to measure the speed of the fragment, due to the unpredictability of the direction of the fragment movement, the fragment impact points of the front and rear targets 6 are difficult to directly correspond, and the impact time sequence is difficult to accurately distinguish the data belonging to the same fragment, so the utility model provides a front and rear measurement target same name fragment accurate matching problem. When the point set registration is carried out, first, the coordinate system is established, the left lower vertex of the measurement target surface facing the explosion center surface is taken as the coordinate origin, the straight line parallel to the target edge is taken as the x1 and x2 axes, and the vertical upward is taken as the y1 and y2 axes positive direction; the explosion center coordinate system takes the projection point of the predetermined explosion center on the ground as the coordinate origin O, the straight line perpendicular to the target surface is taken as the Y axis, the straight line parallel to the target surface and the ground is taken as the X axis, and the vertical upward is taken as the Z axis positive direction. Since the predetermined explosion center is located on the positive half of the Z axis, the target surfaces of the front and rear targets are parallel to the XOZ plane, the distance between the front target 5 and the XOZ plane is D0, and the distance between the front and rear targets is D1, so the equations of the planes where the target surfaces of the front and rear targets are located are Y=D0 and Y=D0+D1 respectively. In order to ensure the accuracy of the point set registration, the line connecting the centers of the front and rear targets should be parallel to the Y axis, and the shapes and sizes of the two targets should be kept consistent. Since the trajectory of the fragment can be approximated as a straight line, and the target surfaces of the front and rear targets are parallel to each other, the front target impact point of the fragment, the explosion center and the rear target impact point on the front target projection point should approximately satisfy the collinear relationship, and the distance ratio between the front target impact point and the two projection points should be approximately equal to the distance ratio between the front target 5 and the explosion center and the rear target. In addition, the flight time of the fragment to the front target 5 should be less than the time to the rear target 6. Therefore, the registration of the point set should satisfy the following collinear conditions, distance equal proportion conditions and impact time sequence conditions:

[0060]

[0061] In the formula: (x p1 ,y p1 ) represents the impact coordinates of the fragment on the front target 5; (x p0 ,y p0 ) and (x p2 ,y p2 ) are respectively the projection point coordinates of the predetermined explosion center and the rear target 6 impact point of the fragment on the front target 5, and (x p2 ,y p2 ) is also the impact coordinates of the fragment on the rear target 6; t p1 , t p2 are respectively the flight times of the fragment to the front and rear targets. Taking D0=5D1 as an example, when the number of fragments is large, for individual fragments, there may be more than one group of point sets that meet the conditions. In order to improve the registration accuracy of the point set, the linear fitting degree and the relative error of the distance ratio of the related point sets are calculated, and the point set with high fitting degree and small relative error is taken as the impact point set of the fragment.

[0062] In order to realize the fast erecting of the rectangular measuring target of the explosion field, the frame structure is used as the basis for installation, first, the aluminum alloy profile is used to make the installation support 2, among which, the array installation frame is made based on the unit measuring area, the fast splicing of each frame can be realized on site according to the test requirements, the test target is installed on the array installation frame, and the standard mounting piece 4 is used to realize the fast installation on the chassis.

[0063] In order to ensure the safety of the wiring, the signal line, the power line and the shielding line are placed in the groove 3, so as to prevent being directly hit by the fragments, in order to reduce the influence of the lead on the test, the power line and the signal line are arranged along the boundary of the array unit 11, and under the maximum allowable current, the size of the lead is set to be minimum; in order to reduce the wiring workload, the socket is arranged on the lead surface, and the multi-core shielding line is used to connect the array module 1 and the collection and storage module, so that the required wiring amount is consistent with the number of the array module 1, wherein the shielding line is used to reduce the influence of the strong electromagnetic interference generated by the explosion on the signal transmission. The socket comprises a power connection position and a plurality of signal connection positions, and the number of the signal connection positions is consistent with the number of the array unit 11 included in the array module 1, and the sequence number of the connection position corresponds to the position sequence number of the array unit 11. In addition, since the straight plug socket is not conducive to the grid arrangement of the measuring surface, the patch type socket is selected in the utility model.

[0064] In order to improve the manufacturing efficiency of the array module 1, the PCB circuit board with FR-4 as the base material is used for manufacturing, and the array unit 11 with the number range is arranged in a PCB circuit board according to the corresponding relationship of the grid spacing requirement and the position and sequence number, and the combined PCB board is used as the array module 1. In the waterproof insulation aspect, the waterproof and moisture-proof is realized from the root by spraying the anti-soldering ink, and the insulation impedance between the two types of grids is improved, and the waterproof and moisture-proof performance is further improved by spraying the nano waterproof coating on the surface of the PCB circuit board.

[0065] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any other form, and any modification or equivalent change made according to the technical essence of the utility model still belongs to the scope of the utility model.

Claims

1. An apparatus for measuring velocity and dispersion characteristics of dense fragments based on an arrayed comb target, characterized by: The test terminal includes a mounting bracket (2), an array module (1), and a test terminal. The array module (1) is mounted on the mounting bracket (2) to form a measurement target. The array module (1) is provided with an adjustable, independent, and coded array unit (11). The test terminal includes an external trigger module, a data acquisition and storage module, and an output module. The external trigger module is mounted on the array unit (11). The array unit (11) includes a signal gate (a) and a power gate (c). The signal gate (a) is provided with a signal output port (b), which is connected to the data acquisition and storage module via a signal line. The data acquisition and storage module is connected to the output module. The power gate (c) is provided with a power input port (d), which is connected to a power source via a power line. The signal gate (a) and the power gate (c) are arranged in a comb-like pattern, with the spacing between adjacent gates of the same type being... Spacing between adjacent heterogeneous gates Twice the spacing between adjacent gates of the same type. Not larger than the minimum size of the fragment being measured, that is, when the minimum size of the fragment being measured is... Spacing between adjacent heterogeneous gates Must meet The spacing between adjacent non-standard gates is no greater than the size of the fragment being tested. Before and after the fragment penetrates the target, the non-standard gates are not connected, and the circuit on the array unit (11) is in an open circuit state. When the fragment hits the target, the non-standard gates on the array unit (11) are connected by the fragment to generate a pulse signal, which is transmitted to the external trigger module through the signal line. The test targets include a front target (5) installed on the front end face of the mounting bracket (2) and a rear target (6) installed on the rear end face of the mounting bracket (2). When the fragment velocity is measured using the dual-zone intercept method, a measurement coordinate system is established, with the lower left vertex of the target surface facing the explosion center as the origin and the straight line of the target edge parallel to the ground as the coordinate origin. and The axis, vertically upward is and The positive direction of the Z-axis; the center-of-explosion coordinate system takes the projection point of the predetermined center of explosion onto the ground as the origin O, the line perpendicular to the target surface as the Y-axis, the line parallel to the target surface and the ground plane as the X-axis, and the vertically upward direction as the positive Z-axis. Since the predetermined explosion center is located at the positive half-axis of Z axis, the target surfaces of the front target (5) and the rear target (6) are parallel to the XOZ plane, the distance between the front target (5) and the XOZ plane is , the distance between the front target (5) and the rear target (6) is , the equations of the planes in which the target surfaces of the front target (5) and the rear target (6) are located are respectively , , the line connecting the centers of the front target (5) and the rear target (6) is parallel to the Y axis, and the shapes and sizes of the two targets are kept consistent, the flying time of the fragments to the front target (5) is less than that to the rear target (6), therefore, the registration of the point sets should satisfy the following collinear condition, distance equivalent condition and hitting target time sequence condition: （1） In the formula: ( , ) indicates the target coordinates of the fragment on the front target (5); , )and( , ) are the coordinates of the projection points of the rear target (6) and the fragmentation point on the front target (5), respectively. , ) is also the target coordinate of the fragment on the rear target (6); , The flight times of the fragments to the front target (5) and the rear target (6) are respectively.

2. The array comb target based close range fragment velocity and dispersion characteristics measurement device as claimed in claim 1, wherein: Also include standard mounting (4), the installation support (2) includes a chassis and array mounting rack, the array mounting rack is installed on the chassis through the standard mounting (4), the array module (1) is installed on the array mounting rack.

3. The array comb target based close-in velocity and dispersion measurement device of claim 2, wherein: The array-based dense fragment velocity and scattering characteristic measuring device also includes an array mounting support (2), the array mounting support (2) is provided with a groove (3), and the power line and the signal line are arranged in the groove (3).

4. The array comb target based close-in velocity and dispersion measurement device of claim 3, wherein: Also include shielding wire, the array unit (11) is connected with the data acquisition storage module through the shielding wire, and the shielding wire is arranged in the groove (3).

5. The array comb target based close-in velocity and dispersion measurement device of claim 1, wherein: The array module (1) is made of a PCB circuit board with FR-4 as a base material, and a corresponding number of array units (11) are arranged in a combined PCB circuit board according to the requirements of the gate spacing and the corresponding relationship of the position and the serial number, and the combined PCB circuit board is used as the array module (1).

6. The array comb target based close-in velocity and dispersion measurement device of claim 1, wherein: The measuring targets are respectively combined by three planar targets in rectangular form, the planar targets on both sides and the middle are respectively spliced by array modules (1) and , wherein i represents the number of array modules (1) in the column direction of the measuring targets on both sides and in the middle, and respectively represent the number of array modules (1) in the row direction of the measuring targets on both sides and in the middle, the width and the height of the measuring targets on both sides are respectively and , the width and the height of the middle are respectively and , the axial angle range of the measuring targets can reach 0°-180°, and the corresponding relationship between the position sequence number and the position of the array module (1) of the measuring target is: （2） In the formula: represents the serial number of the position of the array module (1) in the measurement target; , , respectively represent the row position of the array module (1) in the left, middle and right three regions of the measurement target; , , respectively represent the column position of the array module (1) in the left, middle and right three regions of the measurement target.

7. The array comb target based close-in proximity fragment velocity and dispersion characteristics measurement device of claim 1, wherein: The planar shape of the array unit (11) is square, when the fragment distribution density examination index is p, the fragment scattering angle examination index is , the test allowable error is w, and the specified test distance is , the size L of the array unit (11) needs to meet the following conditions: (3)。

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