CN115200553A

CN115200553A - System for measuring posture and yaw condition of projectile body after barrier collision

Info

Publication number: CN115200553A
Application number: CN202210802432.9A
Authority: CN
Inventors: 秦有权; 吴应祥; 陶西贵; 马媛媛
Original assignee: National Academy of Defense Engineering of PLA Academy of Military Science
Current assignee: National Academy of Defense Engineering of PLA Academy of Military Science
Priority date: 2021-11-29
Filing date: 2022-07-07
Publication date: 2022-10-18
Anticipated expiration: 2042-07-07
Also published as: CN115200553B; CN217541669U

Abstract

The invention provides a system for measuring the posture and the yawing condition of a projectile body after impacting an obstacle, which is used for measuring the posture and the yawing condition of the projectile body after impacting the obstacle; the warp and/or the weft can be rapidly broken, pulse voltage signals are generated through respective pulse circuits, the response time of the pulse voltage signals is less than 1 microsecond, and the measurement requirements of the flight attitudes of low-speed, medium-speed and high-speed objects are met; the working efficiency of the speed measuring site is improved, and the capture target can be quickly replaced during speed measurement. The invention also provides an elastic contact for switching on and off the pulse circuit. The capture target is quickly connected to the pulse circuit. In the using process, whether the contact of each warp and weft is connected reliably is checked; after the object completely passes through the capture target, analyzing the projection area when the high-speed object passes through by combining the perforation of the high-speed object capture target, and further judging the deflection angle of the projectile body; the elastic contact is simple and quick to operate; due to the fact that common materials are used in all, the cost after the measurement is very low for the flight attitude measurement of the high-speed object. By adopting the elastic contact structure, the trouble that the speed measuring tinfoil paper can be fixed to the target plate fixing frame only by the cooperation of a plurality of persons in the conventional speed measuring unit can be overcome, the conducting wire does not need to be manually adhered to the tinfoil paper every time, and the measuring error is effectively reduced.

Description

System for measuring posture and yaw condition of projectile body after barrier collision

Technical Field

The present invention relates to a measuring device, and more particularly, to a system for measuring the attitude and yaw of a projectile after the projectile impacts an obstacle.

Background

At present, a high-speed camera is one of main testing means for recording the flight process of a high-speed object, and is widely applied to the fields of aviation, aerospace, military industry and the like. The high-speed camera can be used for recording flight parameters of high-speed flying objects, even supersonic flying objects. However, high-speed cameras are currently heavily dependent on imports, and commonly used models available in high-speed scenarios are expensive, e.g., up to several million dollars.

Meanwhile, in some high-speed object (projectile) penetration experiments, because the flight attitude of an object after passing through the target or obliquely hitting the target cannot be predicted, a high-speed camera cannot be arranged near the target to record the flight attitude of the high-speed object after passing through the target or obliquely hitting the target. In addition, in the use process of the high-speed camera, in order to record the flight attitude of the supersonic object, under the performance condition of the current high-speed camera, the requirements on the lens and the background light are often high. The above factors limit the use of high-speed cameras, and corresponding measuring devices are needed to make up for the deficiencies of high-speed cameras in some use scenes.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a system and a method for measuring the attitude and the yaw condition of a projectile body after the projectile body collides with an obstacle, which can be suitable for measuring the flight attitude and the yaw condition of low-speed, medium-speed and high-speed objects, and the system and the method are reliable and have low cost.

The technical scheme of the invention is as follows:

a method for measuring the flying attitude and the yawing condition of a projectile after impacting an obstacle specifically comprises the following steps:

the method comprises the following steps: the catching target is arranged in a catching target base and is communicated with a corresponding pulse circuit through warps and wefts;

step two: connecting the capture target base to a high-speed acquisition instrument,

the output of the pulse circuit of each group of warps is transmitted to the signal input end N of the signal acquisition instrument ₁ The output of the pulse circuit of each group of weft threads is transmitted to the signal input end N of the signal acquisition instrument ₂ ；

Step three: recording the output of each pulse circuit in the initial state as V ₁ ；

Step four: setting the distance between each capture target and the obstacle, wherein the distance between the ith capture target and the obstacle after the obstacle is L _i ；

Step five: after the flying object impacts the effective measuring area of the capture target, the change of pulse voltage signals generated by broken warps and wefts along with time is recorded by a high-speed collector, and the voltage V at two ends of the resistor R1 collected by a pulse circuit is obtained ₂ ；

Step six: combining the perforation aftereffect of the ith capture target to obtain the projection area of the object on the base cloth of the ith capture target after the object passes through the base cloth of the ith capture target; the included angle between the axis of the elastomer and the normal direction of the plane of the base cloth is obtained by the ratio of the sectional area of the elastomer to the projection area, namely the deflection angle alpha _i ；α _i ＝arccos(a/b _i )；

Step seven: according to the selected distance L between two adjacent capture targets _i+1 And the variation of the recorded pulse voltage signal with time Deltat _i＝ t _i+1 -t _i Obtaining the flying speed u of the object to be measured _i ；u _i ＝L _i+1 /(t _i+1 -t _i )；

Step eight: wearing deviceAngular velocity W of the centroid of the projectile of the ith capture target _i ＝(α _i+1 -α _i )*u _i /L _i+1 ；

Step nine: taking the center of the impact area after the object impacts the obstacle as a theoretical position, and then according to each deflection angle alpha _i And taking the geometric center of the projection area in the step six as an actual position, and obtaining the yaw condition of the object after the object impacts the obstacle according to the deviation between the actual position and the theoretical position.

Preferably, the center of the projection is taken as a circle center, the radius of the projectile body is taken as a radius to make a section circle, and the deflection angle is obtained through the sectional area of the projectile body and the ratio of the projection area to the projection area.

A system for measuring the flying attitude and the yawing condition of a projectile body after impacting a barrier comprises capture targets, capture target bases and a high-speed acquisition instrument, wherein each capture target is supported by the aid of the respective capture target base, and the capture target bases are connected to the high-speed acquisition instrument through coaxial cables; the capturing target base is provided with elastic contacts, the warp contacts and the weft contacts of the capturing targets are in contact with the elastic contacts of the capturing target base, the pulse circuits corresponding to the warps and the pulse circuits corresponding to the wefts are switched on, a plurality of capturing targets can be arranged in the measuring process, and the flying attitude angle and the flying speed of an object to be measured when the object to be measured collides with the capturing targets are measured for many times.

Preferably, a pulse circuit is arranged between the elastic contacts corresponding to the warp contact pairs formed by the two warp contacts of each warp, a pulse circuit is arranged between the elastic contacts corresponding to the weft contact pairs formed by the two weft contacts of each weft, and the pulse circuits are identical in structure.

Preferably, the target capturing base comprises an outer frame and a fixed base, the outer frame is arranged on the upper surface of the fixed base, the outer frame is supported by the fixed base, and the height of the fixed base can be designed according to the distance between the axis of the flying object and the reference surface in the actual use process.

Preferably, catch the target and include warp, weft, fixed frame and base cloth, the base cloth is fixed through fixed frame, and the warp contact of warp and the weft contact of weft all set up at fixed frame, and warp and weft are fixed to the base cloth.

Preferably, the base cloth comprises a first surface and a second surface, the first surface of the base cloth is provided with a plurality of warps at equal intervals, and the second surface of the base cloth is provided with a plurality of wefts at equal intervals.

Preferably, an elastic contact is provided on an inner side wall of the trapping target accommodating groove.

Preferably, the warps and the wefts are copper wires, an epoxy resin layer is arranged on the outer side of the copper wires, before the epoxy resin layer is dried completely, the warps and the wefts are respectively fixed to the base cloth through the epoxy resin layer, the warps and the wefts are located on different surfaces of the base cloth, but the projections of the warps and the wefts on the base cloth are crossed to form a grid, and the grid is arranged so as to measure the flight attitude of the object to be measured.

Preferably, the distance between two adjacent warp threads is equal to the distance between two adjacent weft threads. The gridding of the base fabric is realized through the warps and the wefts.

Preferably, the distance between two adjacent warps or two adjacent wefts in actual use is smaller than the distance between two adjacent warps or the distance between two adjacent wefts.

Compared with the prior art, the invention has the advantages that:

the invention firstly loads the catching target into the catching target base, the catching target base is communicated with the corresponding pulse circuit through the longitude line or the latitude line, the catching target base is connected to the high-speed acquisition instrument through the elastic contact, and the output of the pulse circuit of each group of longitude lines is transmitted to the signal input end N of the signal acquisition instrument ₁ The output of the pulse circuit of each group of weft threads is transmitted to the signal input end N of the signal acquisition instrument ₂ (ii) a Recording the output of each pulse circuit in the initial state as V ₁ (ii) a After the flying object impacts the effective measuring area of the capture target, the change of pulse voltage signals generated by broken warps and broken wefts along with time is recorded by a high-speed collector, and the resistance R acquired by a pulse circuit is obtained ₁ Voltage V across ₂ (ii) a Combining the perforation effect of the capture target, for example, the perforation after effect, to obtain the projection area of the object on the base cloth after the object passes through the base cloth; obtaining a deflection angle through the sectional area of the projectile body, the projection area and the ratio; according to the distance between two capture targets selected, and four stepsAnd the recorded change of the pulse voltage signal along with time obtains the flying speed of the object to be measured. The center of the projection is used as the center of a circle, the radius of the projectile body is used as the radius to make a section circle, and the deflection angle is obtained according to the ratio of the sectional area of the projectile body to the projection area. According to the system of the present invention, each high speed object capture target is supported by one capture target mount, said high speed object capture target being connected to its corresponding capture target mount by a resilient contact; each catching target base is respectively connected with the high-speed acquisition instrument through a coaxial cable. The catching target comprises base cloth, and warps and wefts are distributed on the base cloth in a longitudinal and transverse mode; the two end points of the warp are warp contacts, and the two end points of the weft are weft contacts.

The base cloth can be any supporting layer which can stably support warps and wefts and can break gaps when bearing instant impact, for example, a hard thin plate or a polytetrafluoroethylene film with the thickness of 0.1-0.5 mm is adopted and is fixed through an outer frame. The warp and the weft can adopt prestressed copper wires, and are externally coated with epoxy resin coatings. After the object touches the capture target, the warps and/or the wefts can be rapidly broken and generate pulse voltage signals through respective pulse circuits, the response time of the pulse voltage signals is less than 1 microsecond, and the measurement requirements of the flight attitudes of low-speed, medium-speed and high-speed objects are met. The spring of the elastic contact is sleeved on the main shaft, a copper cap is arranged at the end part of the main shaft connected with the catching target warp contact or the catching target weft contact, the main shaft is hollow, and the copper cap is connected with the pulse circuit through a wire. In the using process, whether the contact of each warp and weft is connected reliably is checked; after the object completely passes through the capture target, the high-speed acquisition instrument can record the change of pulse voltage signals generated by broken longitude and latitude lines along with time; analyzing the projection area of the high-speed object when the high-speed object passes through by combining the perforation after-effect of the high-speed object capture target, and further judging the posture of the high-speed object; according to the capture target, the projection area of the high-speed object passing through the capture target, such as base cloth, can be obtained through the arrangement of the warp and weft, and the posture of the high-speed object is further determined; by arranging a plurality of targets, the speed of the high speed object can be further calculated from the ratio of distance to time.

For connecting a capture target to a veinAnd the elastic contact of the punching circuit realizes the action of the elastic contact through the matching of the main shaft and the spring. The contact is a copper cap which is made of conductive materials and can be in contact with the warp contact and the weft contact to connect the warp and the weft into respective pulse circuits. In addition, the main shaft is of a hollow structure, the first end of the lead is connected with the contact positioned at the first end of the main shaft, and the lead connected with the contact at the first end of the main shaft penetrates out of the main shaft from the inside of the main shaft. If the length of the main shaft is smaller than that of the capture target accommodating groove, a limiting block is arranged on the part of the main shaft, which is positioned outside the outer frame, so that the main shaft is prevented from falling off. The inner surface of the outer frame can be provided with a gasket which is an annular gasket and is sleeved on the main shaft. The outer ring of the spacer is larger than the spring to protect the inner surface of the outer frame and reduce the abrasion between the inner surface of the outer frame and the spring. If the contact point at the end part of the main shaft is contacted with the inner surface of the outer frame after the capture target is taken out, an insulating pad is arranged at the corresponding position of the inner surface of the outer frame. Alternatively, the second end of the spindle is provided with a terminal to which the second end of the wire is connected. The connecting terminals corresponding to the warp contacts are respectively connected to the channel N of the signal acquisition instrument through coaxial cables ₁ The connecting terminal corresponding to each weft contact is connected to the channel N of the signal acquisition instrument through a coaxial cable ₂ . The elastic contact is simple and quick to operate; due to the fact that common materials are used in all, the cost after the measurement is very low for the flight attitude measurement of the high-speed object. The invention improves the working efficiency of a speed measuring field, and the capture target can be quickly replaced during speed measurement, so that the capture target can be quickly connected into a pulse circuit. By adopting the elastic contact structure, the trouble that the speed measuring tinfoil paper can be fixed to the target plate fixing frame only by the cooperation of a plurality of persons in the conventional speed measuring unit can be overcome, the manual adhesion of a conducting wire to the tinfoil paper is not required every time, and the measuring error is effectively reduced.

Drawings

FIG. 1 is a functional schematic diagram of a projectile attitude and yaw measurement system after impact with an obstacle according to an embodiment of the present invention;

FIG. 2A is a front view of a schematic diagram of warp and weft placement of a capture target of the projectile attitude and yaw condition measuring system and method after impact with an obstacle in accordance with an embodiment of the present invention;

FIG. 2B is a side view of a schematic layout of a baseline of a capture target of the system and method for measuring the attitude and yaw of a projectile after impact with an obstacle in accordance with an embodiment of the present invention;

fig. 3 is a schematic diagram of the working principle of the elastic contact of the system and the method for measuring the posture and the yaw of the projectile after the projectile impacts an obstacle according to the embodiment of the invention.

Fig. 4 is a schematic structural diagram of a pulse circuit of the system and method for measuring the attitude and yaw of a projectile after the projectile impacts an obstacle according to the embodiment of the invention.

Fig. 5 is a schematic structural diagram of elastic contacts for connecting a capture target to a pulse circuit of the system and method for measuring the attitude and yaw of a projectile after the projectile impacts an obstacle according to the embodiment of the invention.

Fig. 6 is a schematic structural diagram of a spindle hole for capturing a first part of an outer frame of a target base after the projectile body attitude and yaw condition measuring system and method impact an obstacle according to an embodiment of the invention.

Fig. 7 is a schematic structural view of a spindle hole of a second portion of an outer frame of a capture target base according to the system and method for measuring the attitude and yaw of a projectile after impact with an obstacle of the embodiment of the invention.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples.

The system and the method for measuring the posture and the yaw condition of the projectile body after the projectile body collides with the obstacle can be used for measuring the flying posture and the yaw condition of the flying object after the flying object passes through the target or obliquely collides with the target. The flying object can be a low-speed flying object, a medium-speed flying object and/or a high-speed flying object.

As shown in fig. 1, the system for measuring the attitude and yaw of a projectile after hitting an obstacle according to an embodiment of the present invention includes a capture target 1, a capture target base 2, and a high-speed acquisition instrument 3. The capture target 1 is supported by a capture target base 2. The capture target base is connected with the high-speed acquisition instrument. Preferably, the capture target base is connected to the high-speed acquisition unit 3 by a coaxial cable 4. Preferably, the invention comprises a plurality of capture targets, each supported by a respective capture target mount, each attached to a respective high speed harvester 3. The capture target base is provided with an elastic contact, and the capture target is connected with the capture target base through the elastic contact. Set up warp and weft on catching the target, the both ends of every warp set up the warp contact, and the both ends of every weft set up the weft contact. The warp and weft contacts of the capture target are in contact with the elastic contacts, respectively. Preferably, the number of the elastic contacts is plural, and each of the elastic contacts is in contact with one of the weft contacts or one of the warp contacts. In the measuring process, a plurality of capture targets can be arranged, and the flying attitude and the flying speed of the object to be measured when the object to be measured impacts the capture targets are measured for a plurality of times.

Pulse circuits are arranged between elastic contacts corresponding to warp contact pairs formed by two warp contacts of each warp, pulse circuits are arranged between elastic contacts corresponding to weft contact pairs formed by two weft contacts of each weft, the structures of the pulse circuits are the same, and each pulse circuit comprises a resistor R ₁ Resistance R ₂ And a power supply V, when the capture target is not fixed on the capture target fixing seat in the initial state, the diode D and the resistor R ₁ And a resistor R ₂ In series connection, reverse spike pulses are prevented by the arrangement of diodes, and all elements are supplied with power by a power supply V. After the catching target is fixed to the catching target fixing seat, the elastic contact corresponding to the warp contact pair formed by the warp contacts of the warp threads is connected into the pulse circuit, the elastic contact corresponding to the weft contact pair formed by the weft contacts of the weft threads is connected into the pulse circuit, the circuit analysis of the catching target is in a communicated state through the warp threads and/or the weft threads, and at the moment, the catching target and the resistor R are connected ₁ In parallel, the output of the pulse circuit is V ₁ (ii) a When the flying object impacts the effective measuring area of the capture target, the warp or weft of the capture target is broken, the circuit branch where the capture target is located is broken, and the effective measuring area is the area where the base cloth of the capture target is exposed on the outer frame of the capture target fixing seat. At this time, the pulse circuit collects the resistance R ₁ As the output V of the circuit ₂ . Output of pulse circuitThe output voltage is output through a coaxial cable to the signal input end of the value signal acquisition instrument. Specifically, the output of the pulse circuit of each group of lines is transmitted to the signal input end N of the signal acquisition instrument ₁ Multiple pulses are input to the same channel N ₁ By the time interval T of each pulse ₁ Each pulse is recorded separately. The output of the pulse circuit of each group of weft is transmitted to the signal input end N of the signal acquisition instrument ₂ (ii) a Multiple pulses are input to a unified channel N ₂ By the time interval T of each pulse ₂ Each pulse is recorded.

The catching target base comprises an outer frame and a fixed base, wherein the outer frame is arranged on the upper surface of the fixed base, the outer frame is supported by the fixed base, and the height of the fixed base can be designed according to the distance between the axis of a flying object and a reference surface in the actual use process. The outer frame is provided with an elastic contact and a pulse circuit. Preferably, the number of the elastic contacts is plural, and the pulse circuit is plural. In use, the size of the frame can be adjusted to match capture targets of different sizes.

The thickness of the catching target is less than or equal to that of the metal outer frame. The outer frame can be two parts, the first part and the second part have the same structure, and after the first part and the second part are butted, a space for accommodating the capture target is formed. Elastic contacts are respectively arranged on the first part of the outer frame and the second part of the outer frame. The elastic contacts are provided on an inner surface of the first part of the housing, for example, on left and right portions of the inner surface of the first part of the housing, where the elastic contacts are configured for contact connection with the warp contacts. The elastic contacts are provided on the inner surface of the second part of the casing, for example, at the upper and lower portions of the inner surface of the second part of the casing, where the elastic contacts are configured to contact with the weft contacts.

Preferably, the upper portion of the fixing base has a circumferential dimension smaller than a circumferential dimension of the lower portion of the fixing base, so as to achieve stable support of the stable capture target.

Preferably, the upper surface of fixing base is provided with the slot, and the bottom of frame is provided with grafting portion, and during the installation, the grafting portion of frame bottom stretches into in the slot of fixing base upper surface to arrange the frame in on the fixing base, realize the support of fixing base to the frame. Preferably, the slot is a strip-shaped groove, and after the insertion part at the bottom of the outer frame is inserted into the slot, a surface support is formed between the bottom surface of the outer frame and the upper surface of the fixed seat.

And in parallel, the bottom of the outer frame is provided with connecting lug parts extending towards two sides of the outer frame, and the connecting lug parts are provided with first connecting holes which are through holes. The upper surface of the fixed seat is provided with a second connecting hole which is a threaded hole. During installation, the fastener passes first connecting hole and twists in the second connecting hole and realize the fixed between frame and the fixing base.

In parallel, the bottom of the outer frame is welded to the upper surface of the fixing seat.

Preferably, the catching target is inserted into the catching target accommodating groove from the opening of the outer frame,

an elastic contact is provided on the inner wall of the capture target accommodating groove. The capture target is connected to the capture target mount through the resilient contact.

Preferably, the elastic contact contacts with a contact of the capture target to communicate the capture target mount and the capture target.

The contacts of the capture target include warp contacts and weft contacts.

The catching target comprises warp threads, weft threads, a fixing frame and base cloth, wherein the fixing frame is a metal fixing frame, and the base cloth is fixed through the metal fixing frame. First surface and the second surface that the base cloth includes, the first surface of base cloth is equidistant to set up many warps, and the second surface of base cloth is equidistant to set up many wefts, and warp and weft are located the different surfaces of base cloth, also can say, warp and weft are located the positive and negative of base cloth. The direction of the warp is vertical to the direction of the weft. The two ends of each warp are provided with warp contacts, and the two ends of each weft are provided with weft contacts. The warp contacts are located on the outer surface of the metal fixing frame. The weft contacts are located on the other outer surface of the metal fixing frame, and the warp contacts can also be located on the first outer surface of the metal fixing frame, and the weft contacts are located on the second outer surface of the metal fixing frame. The first outer surface of the metal fixing frame and the second outer surface of the metal fixing frame are respectively the front surface and the back surface of the metal fixing frame.

The warp threads are fixed to the first surface of the base fabric, and the weft threads are fixed to the second surface of the base fabric. Preferably, the warp threads may be adhered to the first surface of the base fabric, and the weft threads may be adhered to the second surface of the base fabric. More specifically, warp and weft are the copper line, and its outside sets up epoxy layer, and before epoxy layer did not dry thoroughly, fix warp and weft to the base cloth respectively through epoxy layer, and warp and weft are located the different surfaces of base cloth, but warp and weft are alternately in the projection on the base cloth, form the net, so set up so that carry out the flight attitude measurement of the object that awaits measuring.

The warps are arranged at equal intervals on the first surface of the catching target and are parallel to the bottom edge of the catching target. It can also be said that the warp threads are arranged at equal intervals on the first surface of the base fabric and are parallel to the bottom edge of the capture target.

The wefts are arranged on the second surface of the catching target at equal intervals and are parallel to the side edges of the catching target. It can also be said that the respective weft threads are provided at equal intervals on the second surface of the base fabric and the respective warp threads are parallel to the bottom edge of the catching target.

Preferably, the warp contacts and the weft contacts are respectively arranged on the front side and the back side of the metal fixing frame, and the warp contacts are arranged on the first surface of the metal fixing frame at equal intervals. Warp contacts are arranged on two sides of the first surface of the metal fixing frame at equal intervals respectively.

The weft contacts are arranged on the second surface of the metal fixing frame at equal intervals. The upper side and the lower side of the second surface of the metal fixing frame are respectively provided with line contacts at equal intervals.

Preferably, the elastic contacts include a first elastic contact and a second elastic contact. Preferably, the first elastic contacts are arranged at equal intervals on the inner side wall of the trapping target accommodating groove, for example, at equal intervals along a plumb line. The second elastic contacts are arranged at equal intervals on the inner side wall of the trapping target accommodating groove, for example, at equal intervals along a horizontal line. The first elastic contact contacts the warp contacts and the second elastic contact contacts the weft contacts.

Preferably, the distance between two adjacent warp threads is set according to the specific requirements of flight attitude measurement.

Specifically, as shown in FIGS. 2A and 2B, a polytetrafluoroethylene film having a thickness of 0.1mm to 0.5mm is used as the base cloth 13 of the capturing target 1.

The base cloth 13 is distributed with warps 11 and wefts 12 in a longitudinal and transverse mode, and the warps 11 and the wefts 12 are respectively arranged on two sides of the base cloth 13, namely the front side and the back side of the base cloth.

Warp and weft are the copper line, and the skin of copper line sets up epoxy layer.

Preferably, the warp 11 and the weft 12 adopt copper wires with the diameter of 0.2 mm-0.3 mm, and the copper wires are externally coated with epoxy resin coating with the thickness of 0.5 mm-1 mm. Generally, the closer the distance between two adjacent warps is, the better the measurement accuracy is, but considering the balance between the cost and the measurement accuracy and the relationship between the accuracy and the pulse timing, the distance between two adjacent warps, which are arranged at equal intervals on the base fabric 13 by the warps 11 and the wefts 12, is generally 1/5 to 1/10 of the diameter of the flying object. Both ends of the warp threads 11 on the base fabric 13 are catching target warp thread contacts 141. The two end points of the weft thread 12 are weft thread contacts 142.

When the bullet diameter is 76mm, the distance between two adjacent warps or two adjacent wefts is usually 1/5 to 1/10 of the diameter of the flying object, and the distance d is 7.6mm to 15.2mm. The interval between the warp and the weft is equal, the interval is d, the spring speed is v, and when the spring speed is 1000m/s, 1000m/s < 10ns =0.000001m, namely 1 μm is 1mm away. 10ns =0.01 μm, then 10ns goes 0.01mm. The distance is far smaller than the distance between adjacent warps or adjacent wefts in an actual field, and the distance is smaller than the diameter of the bullet. In the actual use process, the distance between two adjacent warps or two adjacent wefts is smaller than the distance d. Therefore, when the projectile body impacts the capture target, the projectile body can touch a plurality of warps or wefts, and the time sequence of the output pulse of the pulse circuit corresponding to the warps can meet the test requirement. Starting from the manufacturing process, the distance can be set to be greater than 5mm.

When the distance between two adjacent warps or two adjacent wefts is more than 1/5 of the diameter of the bullet, the deviation of the cross section area of the bullet is less than 20 percent; when the deviation of the sectional area is less than 20%, the included angle between the axis of the projectile body and the plane of the base cloth can be obtained by the ratio of the projection area of the projectile body section on the base cloth to the projectile body sectional area, and the projection of the space motion direction of the projectile body on the base cloth can be obtained by the projection of the projectile body axis. When the distance between two adjacent warps or two adjacent wefts is greater than 1/10 of the diameter of the bullet, the deviation of the cross section area of the bullet is less than 10%, and the test precision of the included angle between the axis of the bullet body and the plane where the base cloth is located can be improved. In the actual use process, the range of the proportional relation between the distance between two adjacent warps or two adjacent wefts and the bullet diameter can be calculated according to the deviation of the acceptable sectional area in the test process.

As shown in fig. 3, the elastic contact 5 provided at the first portion of the outer frame includes a contact, a main shaft 51 made of an insulating material, a spring 52, and a spring cap 53. The spring 52 is fitted around the spindle 51, and a spring cap is provided at the end of the spring close to the contact, i.e. the first end of the spindle spring is connected to the spring cap. The spring cap is provided with a through hole in the center through which the spring cap is sleeved to the main shaft, the spring cap is fixedly connected with the main shaft, and the second end of the spring is in contact with the inner surface of the outer frame, for example, the inner surface of the first part of the outer frame, so as to realize a warp-connected pulse circuit. A spindle hole is provided in a first portion of the outer frame, and the spindle passes through the spindle hole. If the length of the main shaft is larger than the size of the catching target accommodating groove, the main shaft can not fall out of the main shaft hole without arranging a limiting block. If the length of the main shaft is smaller than that of the catching target accommodating groove, a limiting block is arranged on the part, outside the outer frame, of the main shaft, and the main shaft is prevented from falling off. Preferably, a gasket is provided on the inner surface of the first portion of the outer frame, the gasket being an annular gasket that is fitted over the spindle. The outer ring of the spacer is larger than the spring to protect the inner surface of the outer frame and reduce the abrasion between the inner surface of the outer frame and the spring. In the in-service use process, after the catching target is placed into the catching target accommodating groove, the elastic contact acts, the main shaft moves towards the outside of the catching target accommodating groove, the spring is compressed, and the elastic contact compresses the warp contact. The elastic contact moves toward the inner surface of the second portion of the outer frame by the spring when the target is taken out, and preferably, an insulating pad is provided at a corresponding position of the inner surface of the second portion of the outer frame if the elastic contact is in contact with the inner surface of the second portion of the outer frame after the target is taken out. If the elastic contact does not contact the inner surface of the second portion of the outer frame due to the action of the limiting block after the capture target is taken out, the insulating pad may not be arranged at the corresponding position of the inner surface of the second portion of the outer frame.

The elastic contact 5 provided at the second portion of the outer frame includes a contact, a main shaft 51 made of an insulating material, a spring 52, and a spring cap 53. The spring 52 is fitted over the spindle 51 and a spring cap is provided at the end of the spring adjacent to the contact, i.e. the first end of the spindle spring is connected to the spring cap. The spring cap is provided with a through hole in the center through which the spring cap is fitted to the main shaft, the spring cap being fixedly connected to the main shaft, and the second end of the spring being in contact with the inner surface of the outer frame, for example, the second portion of the outer frame, to implement the weft-connected pulse circuit. A spindle hole is provided in the second portion of the outer frame, through which the spindle passes. If the length of the main shaft is larger than the size of the capture target accommodating groove, the main shaft can not fall out of the main shaft hole without arranging a limiting block. If the length of the main shaft is smaller than that of the capture target accommodating groove, a limiting block is arranged on the part of the main shaft, which is positioned outside the outer frame, so that the main shaft is prevented from falling off. Preferably, a gasket is provided on the inner surface of the second portion of the outer frame, the gasket being an annular gasket that is fitted over the spindle. The outer ring of the spacer is larger than the spring to protect the inner surface of the outer frame and reduce the abrasion between the inner surface of the outer frame and the spring. In the in-service use process, after the catching target is placed into the catching target accommodating groove, the elastic contact acts, the main shaft moves towards the outside of the catching target accommodating groove, the spring is compressed, and the elastic contact compresses the weft contact. The elastic contact moves toward the inner surface of the first portion of the outer frame by the spring when the target is taken out, and preferably, an insulating pad is provided at a corresponding position of the inner surface of the first portion of the outer frame when the elastic contact is brought into contact with the inner surface of the first portion of the outer frame after the target is taken out. If the elastic contact does not contact the inner surface of the first part of the outer frame due to the action of the limiting block after the capture target is taken out, the insulating pad is not arranged at the corresponding position of the inner surface of the first part of the outer frame.

On the main shaft 51 at the catching targetThe end inside the housing groove is provided with a contact, which is of electrically conductive material, which is connected by a wire to the access point a of the pulse circuit. The main shaft is a hollow structure, a first end of the lead is connected with the contact at the first end of the main shaft, the lead connected with the contact at the first end of the main shaft, such as a copper wire, penetrates out of the main shaft from the inside of the main shaft, second ends of the leads are connected to a coaxial cable together, and pulse signals, such as voltage signals, are transmitted through the coaxial cable. The conductor bundle at the tail part of the elastic contact corresponding to each warp contact is connected to the channel N of the signal acquisition instrument through the coaxial cable ₁ The conductor bundle at the tail part of the elastic contact corresponding to each weft contact is connected to the channel N of the signal acquisition instrument through a coaxial cable ₂ 。

In parallel, the second end of the main shaft is provided with a connecting terminal, and the second end of the lead is connected to the connecting terminal. The connecting terminals corresponding to the warp contacts are respectively connected to the channel N of the signal acquisition instrument through coaxial cables ₁ The connecting terminal corresponding to each weft contact is connected to the channel N of the signal acquisition instrument through a coaxial cable ₂ 。

The main shaft 51 is made of high molecular weight polyethylene, a copper cap is arranged at the head connected with the capturing target longitude and latitude contact 14, the inside of the main shaft is hollow, and the copper cap is connected with an on-off pulse circuit through a conducting wire.

In the test process, the projection area of the section of the projectile body on the base cloth is calculated through the projection intersection points of the warps and the wefts on the base cloth, a section circle is made by taking the center of the projection as the circle center and the radius of the projectile body as the radius, and the included angle alpha between the axis of the projectile body and the normal direction of the plane of the base cloth is obtained through the ratio of the section area of the projectile body to the projection area _i ，cosα _i ＝a/b _i Where a is the radius of the projectile and b _i The length of the long axis of the projection on the substrate of the ith capture target.

The measuring method according to the system comprises the following steps:

the capture target is loaded into the capture target mount.

The capture target is arranged in a capture target base and is communicated with a corresponding pulse circuit through warp or weft;

preferably, the catching target is loaded into the catching target accommodating groove of the catching target base, and the spring is compressed to make the elastic contact with the warp contact and the weft contact on the metal outer frame of the catching target, so as to close the pulse circuit.

Preferably, the elastic contact on the capture target base 2 is pulled open, for example, by a stopper on the main shaft of the elastic contact, the capture target 1 is placed in, and the elastic contact is closed.

The capture target base is connected to a high-speed collector through an elastic contact,

Each pulse circuit comprises a resistor R ₁ Resistance R ₂ And a power supply V, when the capture target is fixed on the capture target fixing seat in the initial state, the diode D and the resistor R ₁ And a resistor R ₂ In series, reverse spike is prevented by the arrangement of diodes, and all elements are supplied with power by a power supply V.

Recording the output of each pulse circuit in the initial state as V ₁ ；

After the capture target is fixed to the capture target fixing seat, the warp threads are connected into the pulse circuit through the elastic contacts corresponding to the warp thread contact pairs formed by the two warp thread contacts of the warp threads, the weft threads are connected into the pulse circuit through the elastic contacts corresponding to the weft thread contact pairs formed by the two weft thread contacts of the weft threads, the circuit analysis of the capture target is in a communicated state through the warp threads and/or the weft threads, and at the moment, the capture target and the resistor R are connected ₁ In parallel, the output of the pulse circuit is V ₁ ；

After the flying object impacts the effective measuring area of the capture target, the change of pulse voltage signals generated by broken warps and wefts along with time is recorded by a high-speed collector, and the resistance R collected by a pulse circuit is obtained ₁ Voltage V across ₂ ；

Preferably, when the object passes through a certain warp or weft, the pulse circuit in the on state is disconnected, and a pulse voltage signal is generated and transmitted to the signal acquisition instrument.

When the flying object impacts the effective measuring area of the capture target, the warp or weft of the capture target is broken, the circuit branch where the capture target is located is broken, and the effective measuring area is the area where the base cloth of the capture target is exposed on the outer frame of the capture target fixing seat. At this time, the pulse circuit collects the resistance R ₁ As the output V of the circuit ₂ . Preferably, in order to achieve a reliable communication of the warp and weft, in the branch of the pulse circuit connecting the capture target, a light emitting diode is provided as an indicator light, for example, in series with the corresponding warp or weft of the capture target, in order to indicate the on-off condition of the pulse circuit.

And observing the perforation after-effect of the object capture target to obtain the projection area on the base cloth after the object passes through the base cloth.

In the test process, the projected area of the section of the projectile body on the base cloth is calculated through the intersection points of the projections of the warps and the wefts on the base cloth.

The ratio of the sectional area of the projectile body to the projection area obtains the included angle between the axis of the projectile body and the normal direction of the plane where the base cloth is located.

And taking the center of the projection as the center of a circle and the radius of the projectile body as the radius to form a section circle, and obtaining the included angle between the axis of the projectile body and the normal direction of the plane of the base cloth through the ratio of the sectional area of the projectile body to the projection area.

And obtaining the flying speed of the object to be measured according to the selected distance between the two capture targets and the change of the four recorded pulse voltage signals with time.

The velocity may be a velocity value obtained from the distance between any two capture targets and the time of flight, or may be an average value of a plurality of velocities.

The projectile body flying attitude measuring device can be used for measuring the flying attitude of a flying object after the flying object passes through a target or obliquely collides with the target. The flying object may be a low-speed flying object, a medium-speed flying object, and/or a high-speed flying object.

As shown in fig. 1, the system for measuring the attitude and yaw of a projectile after hitting an obstacle according to an embodiment of the present invention includes a capture target 1, a capture target base 2, and an acquisition instrument 3. The harvester may be a high speed harvester with the capture target 1 supported by a capture target mount 2. The capture target base is connected with the high-speed acquisition instrument. Preferably, the capture target mount is connected to the high speed harvester 3 by a coaxial cable 4. Preferably, the invention comprises a plurality of capture targets, each supported by a respective capture target mount, each attached to a respective high speed harvester 3. The capture target base is provided with an elastic contact, and the capture target is connected with the capture target base through the elastic contact. Set up warp and weft on catching the target, the both ends of every warp set up the warp contact, and the both ends of every weft set up the weft contact. The warp and weft contacts of the capture target are in contact with the elastic contacts, respectively. Preferably, the number of the elastic contacts is plural, and each of the elastic contacts is in contact with one of the weft contacts or one of the warp contacts. In the measuring process, a plurality of capture targets can be arranged, and the flying attitude and the flying speed of the object to be measured when the object to be measured impacts the capture targets are measured for a plurality of times.

Pulse circuits are arranged between elastic contacts corresponding to warp contact pairs formed by two warp contacts of each warp, pulse circuits are arranged between elastic contacts corresponding to weft contact pairs formed by two weft contacts of each weft, the structures of the pulse circuits are the same, and each pulse circuit comprises a resistor R ₁ Resistance R ₂ And a power supply V, when the capture target is not fixed on the capture target fixing seat in the initial state, the diode D and the resistor R ₁ And a resistor R ₂ In series connection, reverse spike pulses are prevented by the arrangement of diodes, and all elements are supplied with power by a power supply V. After the capture target is fixed to the capture target fixing seat, the warp threads are connected into the pulse circuit through the elastic contacts corresponding to the warp thread contact pairs formed by the two warp thread contacts of the warp threads, the weft threads are connected into the pulse circuit through the elastic contacts corresponding to the weft thread contact pairs formed by the two weft thread contacts of the weft threads, the circuit analysis of the capture target is in a communicated state through the warp threads and/or the weft threads, and at the moment, the capture target and the resistor R are connected ₁ In parallel, the output of the pulse circuit is V ₁ (ii) a Effective when flying object strikes catching targetAfter the area is measured, the warps or the wefts of the capture target are broken, the circuit branch where the capture target is located is broken, and the effective measurement area is an area where the base cloth of the capture target is exposed on the outer frame of the capture target fixing seat. At this time, the pulse circuit collects the resistance R ₁ As the output V of the circuit ₂ . The output voltage of the pulse circuit is output through a coaxial cable to the signal input end of the value signal acquisition instrument. Specifically, the output of the pulse circuit of each group of warps is transmitted to the signal input end N of the signal acquisition instrument ₁ Multiple pulses are input to the same channel N ₁ By the time interval T of each pulse ₁ Each pulse is recorded separately. The output of the pulse circuit of each group of weft threads is transmitted to the signal input end N of the signal acquisition instrument ₂ (ii) a Multiple pulses are input to a unified channel N ₂ By the time interval T of each pulse ₂ Each pulse is recorded.

The thickness of the catching target is less than or equal to that of the metal outer frame. The outer frame can be two parts, the first part and the second part have the same structure, and after the first part and the second part are butted, a space for accommodating the capture target is formed. Elastic contacts are respectively arranged on the first part of the outer frame and the second part of the outer frame. The elastic contacts are provided on the inner surface of the first part of the housing, for example, on the left and right portions of the inner surface of the first part of the housing, where the elastic contacts are configured for contacting connection with the warp contacts. The elastic contacts are provided on the inner surface of the second part of the casing, for example, at the upper and lower portions of the inner surface of the second part of the casing, where the elastic contacts are configured to contact with the weft contacts.

Preferably, the upper surface of fixing base is provided with the slot, and the bottom of frame is provided with grafting portion, and during the installation, the grafting portion of frame bottom stretches into in the slot of fixing base upper surface to arrange the frame in on the fixing base, realize the support of fixing base to the frame. Preferably, the slot is a long strip-shaped groove, and after the inserting part at the bottom of the outer frame is inserted into the slot, a surface support is formed between the bottom surface of the outer frame and the upper surface of the fixing seat.

an elastic contact is provided on the inner side wall of the trapping target accommodating groove. The capture target is connected to the capture target mount through the resilient contact.

Preferably, the resilient contact contacts the contact of the capture target to communicate the capture target mount and the capture target.

The contacts of the capture target include warp contacts and weft contacts.

The catching target comprises warp threads, weft threads, a fixing frame and base cloth, wherein the fixing frame is a metal fixing frame, and the base cloth is fixed through the metal fixing frame. First surface and the second surface that base cloth includes, the first surface of base cloth is equidistant to set up many warps, and the second surface of base cloth is equidistant to set up many wefts, and warp and weft are located the different surfaces of base cloth, also can say, warp and weft are located the positive and negative of base cloth. The direction of the warp is vertical to the direction of the weft. The two ends of each warp are provided with warp contacts, and the two ends of each weft are provided with weft contacts. The warp contacts are located on the outer surface of the metal fixing frame. The weft contact is located at the other outer surface of the metal fixing frame, and the warp contact is located at the first outer surface of the metal fixing frame and the weft contact is located at the second outer surface of the metal fixing frame. The first outer surface of the metal fixing frame and the second outer surface of the metal fixing frame are respectively the front surface and the back surface of the metal fixing frame.

The warps are arranged at equal intervals on the first surface of the capture target and are parallel to the bottom edge of the capture target. It can also be said that the warp threads are arranged at equal intervals on the first surface of the base fabric and are parallel to the bottom edge of the capture target.

The weft threads are arranged on the second surface of the catching target at equal intervals and are parallel to the side edge of the catching target. It can also be said that the respective weft threads are provided at equal intervals on the second surface of the base fabric and the respective warp threads are parallel to the bottom edge of the catching target.

The weft contacts are arranged on the second surface of the metal fixing frame at equal intervals. And the upper side and the lower side of the second surface of the metal fixing frame are respectively provided with line contacts at equal intervals.

Preferably, the elastic contacts include a first elastic contact and a second elastic contact. Preferably, the first elastic contacts are arranged at equal intervals on the inner side wall of the capture target accommodating groove, for example, at equal intervals along a plumb line. The second elastic contacts are arranged at equal intervals, for example, along the horizontal line, on the inner side wall of the trapping target accommodating groove. The first elastic contact contacts the warp contacts and the second elastic contact contacts the weft contacts.

Preferably, the distance between two adjacent warps is set according to the specific requirement of flight attitude measurement.

The base cloth 13 is distributed with warps 11 and wefts 12 in a longitudinal and transverse manner, and the warps 11 and the wefts 12 are respectively arranged on two sides of the base cloth 13, namely the front side and the back side of the base cloth.

Preferably, the warp 11 and the weft 12 adopt copper wires with the diameter of 0.2 mm-0.3 mm, and the copper wires are externally coated with epoxy resin coating with the thickness of 0.5 mm-1 mm. Generally, the closer the distance between two adjacent warps is, the better the measurement accuracy is, but considering the balance between the cost and the measurement accuracy and the relationship between the accuracy and the pulse timing, the distance between two adjacent warps, which are arranged at equal intervals on the base fabric 13 by the warps 11 and the wefts 12, is generally 1/5 to 1/10 of the diameter of the flying object. The warp threads 11 on the base fabric 13 have two ends serving as catching target warp thread contacts 141. The two end points of the weft thread 12 are weft thread contacts 142.

When the bullet diameter is 76mm, the distance between two adjacent warps or two adjacent wefts is usually 1/5 to 1/10 of the diameter of the flying object, and the distance d is 7.6mm to 15.2mm. The distance between the warp and weft is equal, d is taken as the distance, v is taken as the spring speed, and 1000m/s × 10ns =0.000001m when the spring speed is 1000m/s, namely 1 μm goes by 1mm.10ns =0.01 μm, then 10ns goes 0.01mm. The distance is far smaller than the distance between adjacent warps or adjacent wefts in an actual field, and the distance is smaller than the diameter of the bullet. In the actual use process, the distance between two adjacent warps or two adjacent wefts is smaller than the distance d. Therefore, when the projectile body impacts the capture target, the projectile body can touch a plurality of warps or wefts, and the time sequence of the output pulse of the pulse circuit corresponding to the warps can meet the test requirement. Starting from the manufacturing process, the distance can be set to be greater than 5mm.

When the distance between two adjacent warps or two adjacent wefts is more than 1/5 of the diameter of the bullet, the deviation of the cross section area of the bullet is less than 20 percent; when the deviation of the cross section area is less than 20%, the included angle between the axis of the projectile body and the plane of the base cloth can be obtained through the ratio of the projection area of the projectile body cross section on the base cloth to the projectile body cross section area, and the projection of the space motion direction of the projectile body on the base cloth can be obtained through the projection of the axis of the projectile body. When the distance between two adjacent warps or two adjacent wefts is larger than 1/10 of the diameter of the bullet, the deviation of the cross section area of the bullet is smaller than 10%, and the test precision of the included angle between the axis of the bullet body and the plane where the base cloth is located can be improved. In the actual use process, the range of the proportional relation between the distance between two adjacent warps or two adjacent wefts and the bullet diameter can be calculated according to the deviation of the acceptable sectional area in the test process.

As shown in fig. 3, the elastic contact 5 provided at the first portion of the outer frame includes a contact, a main shaft 51 made of an insulating material, a spring 52, and a spring cap 53. The spring 52 is fitted around the spindle 51, and a spring cap is provided at the end of the spring close to the contact, i.e. the first end of the spindle spring is connected to the spring cap. The spring cap is provided at the center thereof with a through hole through which the spring cap is fitted to the main shaft, the spring cap is fixedly coupled to the main shaft, and the second end of the spring is in contact with the inner surface of the outer frame, for example, the first portion of the outer frame, to implement a pulse circuit through warp. A spindle hole is provided in a first portion of the outer frame, and the spindle passes through the spindle hole. If the length of the main shaft is larger than the size of the capture target accommodating groove, the main shaft can not fall out of the main shaft hole without arranging a limiting block. If the length of the main shaft is smaller than that of the capture target accommodating groove, a limiting block is arranged on the part of the main shaft, which is positioned outside the outer frame, so that the main shaft is prevented from falling off. Preferably, a gasket is provided on the inner surface of the first portion of the outer frame, the gasket being an annular gasket that is fitted over the spindle. The outer ring of the spacer is larger than the spring to protect the inner surface of the outer frame and reduce the abrasion between the inner surface of the outer frame and the spring. In the actual use process, after the catching target is placed into the catching target accommodating groove, the elastic contact acts, the main shaft moves towards the outside of the catching target accommodating groove, the spring is compressed, and the elastic contact compresses the warp contact. When the capture target is taken out, the elastic contact moves towards the inner surface of the second part of the outer frame under the action of the spring, and preferably, if the elastic contact is contacted with the inner surface of the second part of the outer frame after the capture target is taken out, an insulating pad is arranged at the corresponding position of the inner surface of the second part of the outer frame. If the elastic contact does not contact the inner surface of the second portion of the outer frame due to the action of the limiting block after the capture target is taken out, the insulating pad may not be arranged at the corresponding position of the inner surface of the second portion of the outer frame.

At the end of the spindle 51 inside the capture target receiving chamber is provided a contact of electrically conductive material which is connected by a wire to the access point a of the pulse circuit. The main shaft is a hollow structure, a first end of the lead is connected with the contact at the first end of the main shaft, the lead connected with the contact at the first end of the main shaft, such as a copper wire, penetrates out of the main shaft from the inside of the main shaft, second ends of the leads are connected to a coaxial cable together, and pulse signals, such as voltage signals, are transmitted through the coaxial cable. The conductor bundle at the tail part of the elastic contact corresponding to each warp contact is connected to the channel N of the signal acquisition instrument through the coaxial cable ₁ The conductor bundle at the tail part of the elastic contact corresponding to each weft contact is connected to the channel N of the signal acquisition instrument through a coaxial cable ₂ 。

In the test process, the projected area of the section of the projectile body on the base cloth is calculated through the projection intersection points of the warps and the wefts on the base cloth, a section circle is made by taking the center of the projection as the center of a circle and the radius of the projectile body as the radius, and the included angle between the axis of the projectile body and the normal direction of the plane of the base cloth is obtained through the ratio of the sectional area of the projectile body to the projected area.

When the flight attitude test is carried out, the capture target is arranged in the capture target accommodating groove of the capture target base, and the spring is compressed to enable the elastic contactThe point contacts with the longitude contact and the latitude contact on the metal outer frame of the catching target to connect the pulse circuit. The elastic contact on the capture target base 2 is pulled open, for example, the elastic contact is pulled open through a limit block on the elastic contact main shaft, the capture target 1 is put in, and the elastic contact is closed. And displaying the communication condition of each warp and each weft through a light-emitting diode. Each pulse circuit comprises a resistor R ₁ Resistance R ₂ And a power supply V, when the capture target is fixed on the capture target fixing seat in the initial state, the diode D and the resistor R ₁ And a resistor R ₂ In series, reverse spike is prevented by the arrangement of diodes, and all elements are supplied with power by a power supply V. After the capture target is fixed to the capture target fixing seat, the warp threads are connected into the pulse circuit through the elastic contacts corresponding to the warp thread contact pairs formed by the two warp thread contacts of the warp threads, the weft threads are connected into the pulse circuit through the elastic contacts corresponding to the weft thread contact pairs formed by the two weft thread contacts of the weft threads, the circuit analysis of the capture target is in a communicated state through the warp threads and/or the weft threads, and at the moment, the capture target and the resistor R are connected ₁ In parallel, the output of the pulse circuit is V ₁ (ii) a When the flying object impacts the effective measuring area of the capture target, the warp or weft of the capture target is broken, the circuit branch where the capture target is located is broken, and the effective measuring area is the area where the base cloth of the capture target is exposed on the outer frame of the capture target fixing seat. At this time, the pulse circuit collects the resistance R ₁ As the output V of the circuit ₂ . Preferably, in order to realize reliable communication between the warp and the weft, a light emitting diode is arranged in a path of the pulse circuit connected with the capture target to be used as an indicator light so as to indicate the on-off condition of the pulse circuit. Connecting the capture target base to the high-speed acquisition instrument 3 through an elastic contact; when an object passes through a certain warp or weft, the pulse circuit in the on state is disconnected, a pulse voltage signal is generated, and the signal is transmitted to the signal acquisition instrument. And recording the change of pulse voltage signals generated by the broken warp and weft along with the time by a high-speed acquisition instrument. And observing the perforation after-effect of the object capture target to obtain the projection area on the base cloth after the object passes through the base cloth. In the test process, the projection intersection points of the warps and the wefts on the base cloth are calculatedThe projected area of the projectile cross section on the base fabric. And (3) taking the center of the projection as the center of a circle and the radius of the projectile body as the radius to form a section circle, and obtaining the included angle between the axis of the projectile body and the normal direction of the plane of the base cloth through the ratio of the sectional area of the projectile body to the projection area. And obtaining the flying speed of the object to be measured according to the selected distance between the two capture targets and the change of the four recorded pulse voltage signals along with time. The velocity may be a velocity value obtained from the distance between any two capture targets and the time of flight, or may be an average value of a plurality of velocities.

The system for measuring the posture and the yawing condition of the projectile after impacting the obstacle comprises a high-speed acquisition instrument, a capturing target and a capturing target base, wherein the capturing target is supported by the capturing target base, an elastic contact is arranged on the capturing target base, the capturing target is communicated with the corresponding capturing target base through the elastic contact to connect each warp pulse circuit and each weft pulse circuit of the capturing target, the projectile impacts the capturing target in the flying process to obtain the breaking condition of the projection intersection of warps and wefts on the base cloth, the projection area of the projectile on the base cloth through the capturing target can be obtained, and the included angle between the axis of the projectile and the plane where the capturing target is located is further obtained. The flying speed of the projectile can be measured by any two capture targets. And each capturing target base is respectively connected with the high-speed acquisition instrument through a coaxial cable. The invention has the advantages of reliability and low cost, and is suitable for measuring the flight attitude of an unknown low-speed, medium-speed and high-speed object after passing through the target or obliquely colliding the target in the scientific research process. The projectile body flying attitude measuring device comprises a high-speed acquisition instrument and more than one high-speed object capturing target; each high-speed object capturing target is supported by one capturing target base, and the high-speed object capturing target is connected with the capturing target base corresponding to the high-speed object capturing target through an elastic contact; each catching target base is respectively connected with the high-speed acquisition instrument through a coaxial cable. The high-speed object capturing target comprises base cloth and warps and wefts, wherein the warps and the wefts are distributed on the base cloth in a longitudinal and transverse mode; the two end points of the warp and the weft are capturing target warp and weft contacts. The base cloth is a polytetrafluoroethylene film with the thickness of 0.1-0.5 mm and is fixed to the metal outer frame. The warp and the weft adopt prestressed copper wires, and are externally coated with thick epoxy resin coatings. After the object touches the capture target, the warps and/or the wefts can be rapidly broken and generate pulse voltage signals through respective pulse circuits, the response time of the pulse voltage signals is less than 1 microsecond, and the measurement requirements of the flight attitudes of low-speed, medium-speed and high-speed objects are met. The capture target base is provided with an elastic contact and a pulse circuit; the elastic contact comprises a main shaft, a spring and a spring cap; the spring is sleeved on the main shaft, a copper cap is arranged at the head part of the main shaft connected with the capture target longitude and latitude line contact, the inside of the main shaft is hollow, and the copper cap is connected with the pulse circuit through a lead. According to the capture target, the projection area of the high-speed object passing through the capture target, such as base cloth, can be obtained through the arrangement of the warp and weft, and the posture of the high-speed object is further determined; by arranging a plurality of targets, the speed of the high speed object can be further calculated. The invention uses the elastic contact, the operation is simple and fast; due to the fact that common materials are used in all, the cost after the measurement is very low for the flight attitude measurement of the high-speed object.

An elastic contact 5 for connecting a capture target to a pulse circuit is shown in fig. 5 and comprises a contact 101, a main shaft 51, a spring 52 and a spring cap 53, wherein the spring 52 is sleeved on the main shaft 51, the first end of the spring 52 is connected with the spring cap 53, the center of the spring cap 53 is provided with a through hole, and the spring cap 53 is fixedly connected with the main shaft 51 after being sleeved on the main shaft 51 through the through hole; the second end of the spring 52 is contacted with the inner surface of the outer frame of the catching target base, the side wall of the outer frame is provided with a spindle hole, the spindle 51 passes through the spindle hole and extends out of the catching target accommodating groove of the outer frame, the first end of the spindle is provided with a contact 101 which is contacted with a warp contact and a weft contact so as to connect the catching target into each pulse circuit; after the capture target is placed in the capture target accommodating groove, the elastic contact acts, the main shaft moves towards the outside of the capture target accommodating groove, the spring is compressed, and the elastic contact compresses the warp contact; when the capture target is taken out, the elastic contact is reset under the action of the spring.

Preferably, the contact is a copper cap.

Preferably, the main shaft is a hollow structure, the first end of the wire is connected with the contact at the first end of the main shaft, and the wire connected with the contact at the first end of the main shaft penetrates out of the main shaft from the inside of the main shaft.

Preferably, if the length of the spindle is smaller than the length of the capture target accommodating groove, the part of the spindle outside the outer frame is provided with a stopper 601 to prevent the spindle 51 from falling off.

Preferably, the inner surface of the outer frame is provided with a gasket 701, which is an annular gasket, and the gasket is sleeved on the main shaft 51.

Preferably, the outer ring of the gasket 701 has a size larger than that of the spring to protect the inner surface of the outer frame and reduce abrasion between the outer frame and the spring.

Preferably, when the contact point at the end of the spindle contacts the inner surface of the outer frame after the capture target is taken out, an insulating pad is disposed at a corresponding position on the inner surface of the outer frame.

Preferably, the second end of the spindle is provided with a terminal to which the second end of the wire is connected. The connecting terminals corresponding to the warp contacts are respectively connected to the channel N of the signal acquisition instrument through coaxial cables ₁ The connecting terminal corresponding to each weft contact is connected to the channel N of the signal acquisition instrument through a coaxial cable ₂ 。

The capture target is supported by a capture target mount. The capture target base is connected with the high-speed acquisition instrument through a coaxial cable. Preferably, the elastic contact according to the present invention is provided at a trapping target base, and the trapping target is connected to the trapping target base through the elastic contact. Set up warp and weft on catching the target, the both ends of every warp set up the warp contact, and the both ends of every weft set up the weft contact. The warp and weft contacts of the capture target are in contact with the elastic contacts, respectively. Preferably, the number of the elastic contacts is plural, and each of the elastic contacts is in contact with one of the weft contacts or one of the warp contacts.

Pulse circuits are arranged between elastic contacts corresponding to warp contact pairs formed by two warp contacts of each warp, pulse circuits are arranged between elastic contacts corresponding to weft contact pairs formed by two weft contacts of each weft, the structures of the pulse circuits are the same, and each pulse circuit comprises a resistor R ₁ Resistance R ₂ And a power supply V in an initial stateDiode D and resistor R when the capture target is not fixed on the capture target fixing seat ₁ And a resistor R ₂ In series, reverse spike is prevented by the arrangement of diodes, and all elements are supplied with power by a power supply V. After the catching target is fixed to the catching target fixing seat, the elastic contact corresponding to the warp contact pair formed by the warp contacts of the warp threads is connected into the pulse circuit, the elastic contact corresponding to the weft contact pair formed by the weft contacts of the weft threads is connected into the pulse circuit, the circuit analysis of the catching target is in a communicated state through the warp threads and/or the weft threads, and at the moment, the catching target and the resistor R are connected ₁ In parallel, the output of the pulse circuit is V ₁ (ii) a When the flying object impacts the effective measuring area of the capture target, the warp or weft of the capture target is broken, the circuit branch where the capture target is located is broken, and the effective measuring area is the area where the base cloth of the capture target is exposed on the outer frame of the capture target fixing seat. At this time, the pulse circuit collects the resistance R ₁ As the output V of the circuit ₂ . The output voltage of the pulse circuit is output through a coaxial cable to the signal input end of the value signal acquisition instrument. Specifically, the output of the pulse circuit of each group of lines is transmitted to the signal input end N of the signal acquisition instrument ₁ Multiple pulses are input to the same channel N ₁ By the time interval T of each pulse ₁ Each pulse is recorded separately. The output of the pulse circuit of each group of weft threads is transmitted to the signal input end N of the signal acquisition instrument ₂ (ii) a Multiple pulses are input to a unified channel N ₂ By the time interval T of each pulse ₂ Each pulse is recorded.

The contacts of the capture target include warp contacts and weft contacts.

Preferably, the distance between two adjacent warps is set according to the specific requirement of flight attitude measurement

The elastic contact arranged on the first part of the outer frame comprises a contact, a main shaft, a spring and a spring cap, wherein the main shaft is made of an insulating material. The spring is sleeved on the main shaft, and a spring cap is arranged at the end part of the spring close to the contact, namely, the first end of the main shaft spring is connected with the spring cap. The spring cap is provided at the center thereof with a through hole through which the spring cap is fitted to the main shaft, the spring cap is fixedly coupled to the main shaft, and the second end of the spring is in contact with the inner surface of the outer frame, for example, the first portion of the outer frame, to implement a pulse circuit through warp. A spindle hole 501 is provided in the first part of the outer frame, and the position of the spindle hole is shown in fig. 6. Spindle holes 501 through which a spindle passes are provided at equal intervals in the first part of the outer frame. If the length of the main shaft is larger than the size of the capture target accommodating groove, the main shaft can not fall out of the main shaft hole without arranging a limiting block. If the length of the main shaft is smaller than that of the capture target accommodating groove, a limiting block is arranged on the part of the main shaft, which is positioned outside the outer frame, so that the main shaft is prevented from falling off. Preferably, a gasket is provided on the inner surface of the first portion of the outer frame, the gasket being an annular gasket that is fitted to the main shaft. The outer ring of the spacer is larger than the spring to protect the inner surface of the outer frame and reduce the abrasion between the inner surface of the outer frame and the spring. In the in-service use process, after the catching target is placed into the catching target accommodating groove, the elastic contact acts, the main shaft moves towards the outside of the catching target accommodating groove, the spring is compressed, and the elastic contact compresses the warp contact. When the capture target is taken out, the elastic contact moves towards the inner surface of the second part of the outer frame under the action of the spring, and preferably, if the elastic contact is contacted with the inner surface of the second part of the outer frame after the capture target is taken out, an insulating pad is arranged at the corresponding position of the inner surface of the second part of the outer frame. If the elastic contact does not contact the inner surface of the second portion of the outer frame due to the action of the limiting block after the capture target is taken out, the insulating pad may not be arranged at the corresponding position of the inner surface of the second portion of the outer frame.

The elastic contact arranged on the second part of the outer frame comprises a contact, a main shaft, a spring and a spring cap, wherein the main shaft is made of an insulating material. The spring is sleeved on the main shaft, and a spring cap is arranged at the end part of the spring close to the contact, namely, the first end of the main shaft spring is connected with the spring cap. The spring cap is provided with a through hole in the center through which the spring cap is fitted to the main shaft, the spring cap being fixedly connected to the main shaft, and the second end of the spring being in contact with the inner surface of the outer frame, for example, the second portion of the outer frame, to implement the weft-connected pulse circuit. The second part of the outer frame is provided with a second spindle hole 801 through which the spindle passes, the position of the spindle hole being shown in fig. 7. If the length of the main shaft is larger than the size of the capture target accommodating groove, the main shaft can not fall out of the main shaft hole without arranging a limiting block. If the length of the main shaft is smaller than that of the capture target accommodating groove, a limiting block is arranged on the part of the main shaft, which is positioned outside the outer frame, so that the main shaft is prevented from falling off. Preferably, a gasket is provided on the inner surface of the second portion of the outer frame, the gasket being an annular gasket that is fitted over the spindle. The size of the outer ring of the gasket is larger than that of the spring so as to protect the inner surface of the outer frame and reduce the abrasion between the outer frame and the spring. In the in-service use process, after the catching target is placed into the catching target accommodating groove, the elastic contact acts, the main shaft moves towards the outside of the catching target accommodating groove, the spring is compressed, and the elastic contact compresses the weft contact. The elastic contact moves toward the inner surface of the first portion of the outer frame by the spring when the target is taken out, and preferably, an insulating pad is provided at a corresponding position of the inner surface of the first portion of the outer frame when the elastic contact is brought into contact with the inner surface of the first portion of the outer frame after the target is taken out. If the elastic contact does not contact the inner surface of the first part of the outer frame due to the action of the limiting block after the capture target is taken out, the insulating pad is not arranged at the corresponding position of the inner surface of the first part of the outer frame.

At the end of the spindle inside the capture target receiving chamber is provided a contact of conductive material which is connected by a wire to the access point a of the pulse circuit. The main shaft is a hollow structure, the first end of the lead is connected with the contact at the first end of the main shaft, the lead connected with the contact at the first end of the main shaft, such as a copper wire, penetrates out of the main shaft from the inside of the main shaft, the second ends of the leads are connected to a coaxial cable together, and pulse signals, such as voltage signals, are transmitted through the coaxial cable. The conductor bundle at the tail part of the elastic contact corresponding to each warp contact is connected to the channel N of the signal acquisition instrument through the coaxial cable ₁ The conductor bundle at the tail part of the elastic contact corresponding to each weft contact is connected to the channel N of the signal acquisition instrument through a coaxial cable ₂ 。

In parallel withThe second end of the main shaft is provided with a wiring terminal, and the second end of the wire is connected to the wiring terminal. The connecting terminals corresponding to the warp contacts are respectively connected to the channel N of the signal acquisition instrument through coaxial cables ₁ The connecting terminal corresponding to each weft contact is connected to the channel N of the signal acquisition instrument through a coaxial cable ₂ 。

The main shaft is made of high molecular weight polyethylene, a copper cap is arranged at the head part connected with the longitude and latitude line contact 14 of the capture target, the inside of the main shaft is hollow, and the copper cap is connected with the on-off pulse circuit through a lead.

The elastic contact in the invention has simple and quick operation; the cost after the measurement is very low for the flight attitude measurement of the high-speed object due to the fact that common materials are completely used; the working efficiency of the speed measuring field is improved, the capture target can be quickly replaced during speed measurement, and the capture target can be quickly connected into the pulse circuit. By adopting the elastic contact structure, the trouble that the speed measuring tinfoil paper can be fixed to the target plate fixing frame only by the cooperation of a plurality of persons in the conventional speed measuring unit can be overcome, the conducting wire does not need to be manually adhered to the tinfoil paper every time, and the measuring error is effectively reduced.

The invention has simple and quick operation; due to the fact that common materials are used in all, the cost after the measurement is very low for the flight attitude measurement of the high-speed object.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A system for measuring the flying attitude and the yawing condition of a projectile body after impacting a barrier is characterized by comprising capture targets, capture target bases and a high-speed acquisition instrument, wherein each capture target is supported by the aid of the respective capture target base, and the capture target bases are connected to the high-speed acquisition instrument through coaxial cables; the capturing target base is provided with elastic contacts, the warp contacts and the weft contacts of the capturing targets are in contact with the elastic contacts of the capturing target base, the pulse circuits corresponding to the warps and the pulse circuits corresponding to the wefts are connected, a plurality of capturing targets can be arranged in the measuring process, and the flying attitude angle and the flying speed of an object to be measured when the object to be measured impacts the capturing targets are measured for multiple times.

2. The system for measuring the flying attitude and the yawing attitude of a projectile after the projectile impacts on an obstacle according to claim 1, wherein a pulse circuit is arranged between the elastic contacts corresponding to the pair of warp contacts formed by the two warp contacts of each warp, and a pulse circuit is arranged between the elastic contacts corresponding to the pair of weft contacts formed by the two weft contacts of each weft, and the pulse circuits have the same structure.

3. The system of claim 2, wherein the target holder comprises an outer frame and a holder, the outer frame is disposed on the upper surface of the holder, the holder supports the outer frame, and the height of the holder can be designed according to the distance between the axis of the flying object and the reference plane during actual use.

4. The system of claim 2, wherein the capture target comprises warp threads, weft threads, a fixing frame and a base cloth, the base cloth is fixed by the fixing frame, the warp thread contacts of the warp threads and the weft thread contacts of the weft threads are both disposed on the fixing frame, and the warp threads and the weft threads are fixed to the base cloth.

5. The system of claim 4, wherein the base fabric comprises a first surface and a second surface, the first surface of the base fabric having a plurality of warp threads disposed therein at equal intervals, and the second surface of the base fabric having a plurality of weft threads disposed therein at equal intervals.

6. The system for measuring flying attitude and yaw of a projectile after impact with an obstacle according to claim 5, wherein an elastic contact is provided on an inner side wall of the catching target accommodating groove.

7. The system according to claim 6, wherein the warps and the wefts are copper wires, and an epoxy resin layer is disposed on the outer side of the copper wires, before the epoxy resin layer is dried, the warps and the wefts are respectively fixed to the base cloth through the epoxy resin layer, the warps and the wefts are disposed on different surfaces of the base cloth, but projections of the warps and the wefts on the base cloth intersect to form a grid, and the system is disposed so as to perform measurement of the flying attitude of the object to be measured.

8. The system of claim 7, wherein the distance between two adjacent warp threads is equal to the distance between two adjacent weft threads. The gridding of the base cloth is realized through the warps and the wefts.

9. The system for measuring the flying attitude and the yawing attitude of a projectile after the projectile impacts on an obstacle according to claim 8, wherein the distance between two adjacent warps or between two adjacent wefts during actual use is smaller than the distance between two adjacent warps or between two adjacent wefts.