Font Size: a A A

Study Of Impulse Correction Mehod For The Two-dimensional Trajectory Correction Anti-aircraft Projectile

Posted on:2008-07-19Degree:DoctorType:Dissertation
Country:ChinaCandidate:W J YaoFull Text:PDF
GTID:1102360215498566Subject:Artillery, Automatic Weapon and Ammunition Engineering
Abstract/Summary:PDF Full Text Request
With the improvement of high velocity and maneuverability of the target, the commonantiaircraft gun system can't satisfy the need of modern flight. Using the trajectorycorrection technology to modify the common middle and small caliber ammunition canimprove fire efficiency of the antiaircraft gun system obviously. The problems in thetwo-dimensional trajectory impulse correction antiaircraft ammunition method includetarget tracking, trajectory computation, attitude determination, initial alignment, impulseengine control and trajectory correction. In order to solve these problems, firstly, in thispaper the system concept and key technologies are analyzed. Secondly, the impulsecorrection model and the control method for impulse engine are studied. At last throughsimulation two models between working parameters and correction effect are put forward,and then one simple control method is brought out, the feasibility of this method is provedthrough simulation.Thinking about the two-dimensional trajectory impulse correction antiaircraftammunition system, the system makeup and working principle are analyzed, and theworking flow chart is put forward. Some key technologies including target tracking,trajectory computation, attitude determination, initial alignment, instruction transmissionand trajectory correction are analyzed. Using the position sensitive detector and groundlaser, one initial alignment method is given.The affection of basic impulse parameters on correction ability is analyzed from the 6freedom trajectory equation with correction impulse, and the relationship models betweenthem are deduced. According to these models, the basic impulse parameters are selectedadapting to the setting projectile in this paper: the rotation speed is 5~7r/s, the magnitudeof impulse is 1023N, the ascending and descending time is lms, the working time is 10ms,and the nozzle is installed in the cross section of the mass center of the projectile, thus themomentum of impulse can be ignored. According to these parameters, the impulse engineis manufactured.The optimal control solution for the impulse engine is studied. Based on theparticularity of the antiaircraft trajectory correction projectile, a control model oncharacteristic parameters of the trajectory is derived from the guide line of least energycost in the optimal control theory, and this model is solved by target shooting method. Thevariation rules of optimal trajectory parameters and impulse direction are obtained. From the simulation results, the correction ability of this optimal control model reaches 53.17percent.The effects of the impulse engine working parameters including initial correction time,the class number of engine, the action angle and the projectile firing angle on correctionability are studied. The simulation experiments are designed by Uniform Design method.One model among total correction ability and initial correction time, the class number ofengine, the firing angle is obtained from regression analysis. Another model betweencorrection ability in three directions and the action angle is obtained. From these tworelationship models one simple control strategy is put forward, which can control theimpulse engine fast and simply. From the Monte Carlo simulation experiments, this simplecontrol strategy is proved to be effective. For the non-maneuvering targets, the correctionability reaches 42.7 percent. For the maneuvering targets, the correction ability reaches51.2 percent.The impulse engine and reduced-scale model projectile are manufactured. Theignition circuit for impulse engine is designed. One simple experiment is done in therotary table. The moving track of the projectile is obtained from the high speedphotography. The correction velocity is got from the images, which proved someconclusions from studies' in this paper.
Keywords/Search Tags:two-dimensional trajectory impulse correction antiaircraft ammunition, initial alignment, optimal control, simple control, impulse control, correction model
PDF Full Text Request
Related items