CN103063870B - Measuring method for initial velocity of ammunition body at gun muzzle - Google Patents

Abstract

The invention relates to a measuring technique for the initial velocity of conventional ammunition at a gun muzzle, in particular to a measuring method for the initial velocity of a ammunition body at the gun muzzle, wherein the measuring method for the initial velocity of the ammunition body at the gun muzzle is based on oblique arrangement of two accelerometers and solves the problems that the error of a measuring result is large and the like in an existing measuring method for the initial velocity of the ammunition body at the gun muzzle. The measuring method for the initial velocity of the ammunition body at the gun muzzle comprises the following steps: (I) building a system of rectangular coordinates O-X<b>Y<b> for the ammunition body, wherein center of the ammunition body is arranged to be the origin of the system of rectangular coordinates for the ammunition body, and the OX<b> axis is in the axial direction of the ammunition body; (II) utilizing the two accelerometers Ay and Ad and relative electronic circuits to form a measuring system for the initial velocity of the ammunition body at the gun muzzle, wherein the installation method is as follows: the accelerometer Ay is installed on the OY<b> axis and the sensitive direction of the accelerometer Ay is in accordance with the OY<b> axis; the accelerometer Ad is installed on the OD<b> axis and the sensitive direction of the accelerometer Ad , the OD<b> axis is in the X<b>OY<b> plane, and the included angle between the OD<b> axis and the OY<b> axis is theta; and the theta angle is specifically determined by the measuring ranges of the accelerometers Ay and Ad and the set measuring range of the axial acceleration of the ammunition body. The measuring method for the initial velocity of the ammunition body at the gun muzzle is reasonable in design and accurate and reliable in measuring results.

Description

Body gun muzzle initial velocity measuring method

Technical field

The present invention relates to conventional ammunition gun muzzle initial velocity measuring technique, specifically a kind of body gun muzzle initial velocity measuring method based on two accelerometer tilted configuration.

Background technology

The transformation of conventional ammunition guidanceization is the developing direction of current precision strike weapon, and the Measurement accuracy of gun muzzle initial velocity is directly connected to the calculation accuracy of outer trajectory.While going out gun muzzle due to body, Gao Xuan, high overload the various thing physical and chemical reactions such as powder gas, smog with High Temperature High Pressure, make the high-acruracy survey of gun muzzle initial velocity more difficult.

Conventional gun muzzle initial velocity measuring method mainly contains outside measurement method and internal test method two classes.Outside measurement method is the measuring method by flat pad or body external instrument equipment, and as laser velocimeter, break-make target test the speed, coil target tests the speed etc., it can not be transferred to institute's measurement information body in time, can not be used for ballistic solution on real-time bullet; Existing internal test method be utilize that optical fiber tests the speed, magnetic survey speed and inertial navigation are tested the speed etc., it can complete ballistic solution in real time, but the impact that optical fiber tests the speed, magnetic survey speed need to be considered light, magnetic field etc., independence and adaptive faculty are poor, are not easy to operation.Inertial navigation is tested the speed and is not had the problems referred to above, but the axial high overload producing in body emission process can affect the test performance of accelerometer, causes measurement result inaccurate, even can damage device.

In sum, existing conventional ammunition gun muzzle initial velocity measuring method is unfavorable for conventional ammunition guidanceization independence and quick-reaction capability (QRC), easily affected by environment, affects body attack precision.Be necessary to invent a kind of brand-new body gun muzzle initial velocity measuring method, to realize the Measurement accuracy of certainly advocating peace of body gun muzzle initial velocity.

Summary of the invention

The problems referred to above that the present invention exists in order to solve existing body gun muzzle initial velocity measuring method, provide a kind of body gun muzzle initial velocity measuring method based on two accelerometer tilted configuration.

The present invention adopts following technical scheme to realize:

A kind of body gun muzzle initial velocity measuring method, comprises the steps:

(I) sets up body rectangular coordinate system O-X ^by ^b, its heart of being hit by a bullet is made as the initial point of body rectangular coordinate system, OX ^baxle is along elastomer axis direction;

(II) adopts two accelerometer Ay, Ad, and (those skilled in the art all know how to be connected this corresponding electronic circuit with corresponding electronic circuit composition body gun muzzle initial velocity measuring system, belong to known technology), mounting means is as follows: accelerometer Ay is arranged on OY ^baxle and its sensitive direction and OY ^baxle is consistent; Accelerometer Ad is arranged on OD ^baxle and its sensitive direction and OD ^baxle is consistent, described OD ^baxle is at X ^boY ^bin plane and and OY ^bthe angle of axle is θ angle; Described θ angle size is specifically determined by the range of the range of accelerometer Ay, Ad and the body axial acceleration of setting;

(III) utilized and is arranged on OY ^baxle and OD ^baccelerometer Ay on axle, Ad output valve are resolved the axial accekeration of body: when body is from being transmitted into out gun muzzle, establishing body axial acceleration is a _x, body radial acceleration a _yby accelerometer, Ay measures, OD ^baxle is at X ^boY ^bin plane and OY ^bthe angle theta of axle is known, OD ^bbody acceleration a on axle _dby accelerometer, Ad measures; Derive acceleration a by triangle of vectors funtcional relationship _x, a _y, a _dbetween relational expression (1), as follows:

a _d=a _xsinθ+a _ycosθ（1）

Calculate body from being transmitted into out the axial acceleration a gun muzzle _x,

$a_x=\frac{a_d-a_y\cos \mathrm{\&theta;}}{\sin \mathrm{\&theta;}};$

Initial velocity when (IV) resolves body arrival gun muzzle: computing formula is as follows:

$V\left(t\right)={\&Integral;}_0^t{a}_x\left(\mathrm{\&iota;}\right)\mathrm{d\&tau;}=\frac{1}{\sin \mathrm{\&theta;}}{\&Integral;}_0^t{a}_d\left(\mathrm{\&tau;}\right)\mathrm{d\&tau;}-{\&Integral;}_0^t{a}_y\left(\mathrm{\&tau;}\right)\mathrm{d\&tau;}---\left(2\right)$

In formula (2), V (t) arrives initial velocity when gun muzzle for body, upper limit of integral t be the body measured from being transmitted into the time of gun muzzle, complete the measurement of body gun muzzle initial velocity.To those skilled in the art, the measured value of time t easily obtains.

For inertial navigation speed-measuring method, due to body in-flight high overload make aspect range and precision, do not having satisfactory accelerometer can be directly installed on the OX of missile coordinate system at present ^baxle and directly measure the acceleration of body, so, utilize and be arranged on respectively Y in missile coordinate system ^band D ^binitial acceleration ax when two non-orthogonal high precision of axle, small-range accelerometer Ay, Ad output information complete body arrival gun muzzle by formula (1) calculates, for solve body in-flight high overload make the difficult problem of accelerometer range and measuring accuracy contradiction, and to calculating gained body initial acceleration a _xinitial velocity V while arriving gun muzzle by formula (2) integral and calculating body, completes the measurement of body gun muzzle initial velocity.Axial acceleration a simultaneously _xcan make up the measuring error that radially (centripetal) acceleration causes, realization is measured high acceleration, high-acruracy survey with small-range, high-precision accelerometer.Wherein, reasonably θ angle size determines that method is as follows: according to concrete actual conditions, for example, be that 100g(is acceleration a if select the range of accelerometer Ay, Ad _y, a _dvalue be 100), setting the range that detects body axial acceleration is that 10000g(is acceleration a _xvalue be 10000), above numerical value is updated in formula (1) and can determines rational θ angle, certainly, it can be different selecting the range of accelerometer Ay, Ad.So, in the time utilizing the inventive method to measure gun muzzle initial velocity of High Rotation Speed body, need first determine according to actual conditions the size at rational θ angle, also just determine the installation site of small-range, high-precision accelerometer Ad.

The present invention is reasonable in design, a measurement difficult problem for range and precision contradiction while utilizing the accelerometer of high precision that two nonopiate strapdowns install, small-range to solve the axial acceleration instrumentation amount of High Rotation Speed body, and measurement result accurately and reliably, the series of problems such as the measuring result error that existing body gun muzzle initial velocity measuring method exists is large, complicated operation have been solved simultaneously.

Brief description of the drawings

Fig. 1 is the instrumentation plan of the inventive method.

Embodiment

Below in conjunction with accompanying drawing, specific embodiments of the invention are elaborated.

A kind of body gun muzzle initial velocity measuring method, comprises the steps:

(I) sets up body rectangular coordinate system O-X ^by ^b, its heart of being hit by a bullet is made as the initial point of body rectangular coordinate system, OX ^baxle is along elastomer axis direction;

(II) adopts two accelerometer Ay, Ad and corresponding electronic circuit composition body gun muzzle initial velocity measuring system, and mounting means is as follows: as shown in Figure 1, accelerometer Ay(strapdown) be arranged on OY ^baxle and its sensitive direction and OY ^baxle is consistent; Accelerometer Ad(strapdown) be arranged on OD ^baxle and its sensitive direction and OD ^baxle is consistent, described OD ^baxle is at X ^boY ^bin plane and and OY ^bthe angle of axle is θ angle; Described θ angle size is specifically determined by the range of the range of accelerometer Ay, Ad and the body axial acceleration of setting;

(III) utilizes (strapdown) to be arranged on OY ^baxle and OD ^baccelerometer Ay on axle, Ad output valve are resolved the axial accekeration of body: when body is from being transmitted into out gun muzzle, establishing body axial acceleration is a _x, body radial acceleration a _yby accelerometer, Ay measures, OD ^baxle is at X ^boY ^bin plane and OY ^bthe angle theta of axle is known, OD ^bbody acceleration a on axle _dby accelerometer, Ad measures; Derive acceleration a by triangle of vectors funtcional relationship _x, a _y, a _dbetween relational expression (1), as follows:

a _d=a _xsinθ+a _ycosθ（1）

Calculate body from being transmitted into out the axial acceleration a gun muzzle _x,

$a_x=\frac{a_d-a_y\cos \mathrm{\&theta;}}{\sin \mathrm{\&theta;}};$

Initial velocity when (IV) resolves body arrival gun muzzle: computing formula is as follows:

$V\left(t\right)={\&Integral;}_0^t{a}_x\left(\mathrm{\&iota;}\right)\mathrm{d\&tau;}=\frac{1}{\sin \mathrm{\&theta;}}{\&Integral;}_0^t{a}_d\left(\mathrm{\&tau;}\right)\mathrm{d\&tau;}-{\&Integral;}_0^t{a}_y\left(\mathrm{\&tau;}\right)\mathrm{d\&tau;}---\left(2\right)$

In formula (2), V (t) arrives initial velocity when gun muzzle for body, upper limit of integral t be the body measured from being transmitted into the time of gun muzzle, complete the measurement of body gun muzzle initial velocity.When concrete enforcement, the mounting points of described accelerometer Ay, Ad equates to the distance of body rectangular coordinate system initial point, has further ensured axial acceleration a when resolving body arrives gun muzzle _xaccuracy.

Claims (2)

1. body gun muzzle initial velocity measuring method, is characterized in that: comprise the steps:

(I) sets up body rectangular coordinate system O-X ^by ^b, its heart of being hit by a bullet is made as the initial point of body rectangular coordinate system, OX ^baxle is along elastomer axis direction;

(II) adopts two accelerometer Ay, Ad and corresponding electronic circuit composition body gun muzzle initial velocity measuring system, and mounting means is as follows: accelerometer Ay is arranged on OY ^baxle and its sensitive direction and OY ^baxle is consistent; Accelerometer Ad is arranged on OD ^baxle and its sensitive direction and OD ^baxle is consistent, described OD ^baxle is at X ^boY ^bin plane and and OY ^bthe angle of axle is θ angle; Described θ angle size is specifically determined by the range of the range of accelerometer Ay, Ad and the body axial acceleration of setting;

(III) utilizes strapdown to be arranged on OY ^baxle and OD ^baccelerometer Ay on axle, Ad output valve are resolved the axial accekeration of body: when body is from being transmitted into out gun muzzle, establishing body axial acceleration is a _x, body radial acceleration a _yby accelerometer, Ay measures, OD ^baxle is at X ^boY ^bin plane and OY ^bthe angle theta of axle is known, OD ^bbody acceleration a on axle _dby accelerometer, Ad measures; Derive acceleration a by triangle of vectors funtcional relationship _x, a _y, a _dbetween relational expression (1), as follows:

a _d=a _xsinθ+a _ycosθ （1）

Calculate body from being transmitted into out the axial acceleration a gun muzzle _x, $a_x=\frac{a_d-a_y\cos \mathrm{\&theta;}}{\sin \mathrm{\&theta;}}$ ；

Initial velocity when (IV) resolves body arrival gun muzzle: computing formula is as follows:

$V\left(t\right)={\&Integral;}_0^t{a}_x\left(\mathrm{\&tau;}\right)\mathrm{d\&tau;}=\frac{1}{\sin \mathrm{\&theta;}}{\&Integral;}_0^t{a}_d\left(\mathrm{\&tau;}\right)\mathrm{d\&tau;}-\frac{1}{\tan \mathrm{\&theta;}}{\&Integral;}_0^t{a}_y\left(\mathrm{\&tau;}\right)\mathrm{d\&tau;}---\left(2\right)$

In formula (2), V (t) arrives initial velocity when gun muzzle for body, upper limit of integral t be the body measured from being transmitted into the time of gun muzzle, complete the measurement of body gun muzzle initial velocity.

2. body gun muzzle initial velocity measuring method according to claim 1, is characterized in that: the mounting points of described accelerometer Ay, Ad equates to the distance of body rectangular coordinate system initial point.