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弹丸外弹道相似性分析 总被引:1,自引:1,他引:0
以旋转稳定弹丸为对象,讨论了用模拟弹代替实物弹试验时,其两弹外弹道相似的可能性和条件。这对实际工作中的外弹道研究,特别虽外弹道测试技术中所遇到的一些具体问题,有一定参考与指导意义。 相似文献
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《火炮发射与控制学报》2021,(3)
针对传统的外弹道测量手段本身所存在的危险性以及测试过程不可逆,难以满足新型武器系统的外弹道测试需求的问题,提出了一种安全准确的外弹道理论研究方法,利用MATLAB仿真软件求解弹丸的飞行姿态。以无控旋转弹丸为研究对象,依据弹箭飞行动力学理论,运用质心运动定理和动量矩定理分析弹丸的质心运动和绕质心转动的飞行过程,建立弹丸飞行姿态的数学模型,应用龙格-库塔法进行模型求解以及数据分析处理,得到弹丸的外弹道转速与章动曲线,并与实验测试曲线进行对比分析,所得结果基本一致,从而验证了所建立的旋转弹丸姿态数学模型的合理性。 相似文献
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不同口径旋转稳定弹丸的弹道相似原理研究 总被引:1,自引:0,他引:1
以旋转稳定弹丸为对象,推导了不同口径弹丸的弹道相似原理,得到了两弹在飞行时间、飞行速度、飞行距离、旋转速度和章动特性等弹道参数上的相似条件和相似关系。通过弹道仿真计算验证了本文提出的弹道相似原理及相似关系的精度。 相似文献
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基于太阳方位角原理的炮弹飞行姿态遥测 总被引:5,自引:0,他引:5
本文根据常规兵器外弹道弹丸飞行姿态测试这一应用需求,采用数字测量技术及弹载预处理技术,对太阳方位角遥测系统进行了研究。文中给出了太阳方位角测量原理及太阳方位角传感器数学模型,提出并实现了数字太阳方位角遥测系统。该系统实际用于1.8万g炮射环境的靶场测试,首次在我国获得了高g弹丸在外飞行弹道上的太阳方位角数据,并由此获得了弹丸的章动、进动和转动等信息,可用于旋转稳定弹的飞行姿态测量。 相似文献
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讨论了某些特殊用途武器低伸弹道情况下的过稳定弹丸与稳定弹丸的飞行弹道特征区别,指出过稳定弹丸的有利与不利因素,揭示了过稳定弹丸比稳定弹丸射程远的原因及获取过稳定性的一些技术途径。为今后过稳定旋转弹丸的应用提供参考。 相似文献
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Expert systems aimed at the general design of projectiles can implement a series of intelligent designs, such as the design of HE shell, the scheme expounded and proved, the emulation analysis and calculation, etc. Aiming at the product design feature, the expert system adopts the object-oriented knowledge representation and all kinds of inference control engines to describe and reason the relevant knowledge regarding the product through the microcomputer. It embodies the foundation of emulation analysis and simulated manufacturing of the shell. It makes use of the method that knowledge expression is combined with condition of inference to carry out the overall design and emulation and reference.The paper gives the ways through which the functions can be achieved, gives the modularization of reference and the design methods of systematization, puts forward the method of knowledge expression and working interface, and supplies a platform for similar products of the shell category that can be quickly designed. 相似文献
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In order to study the effect of rotation on the combustion in the underwater vehicle, a two-phase turbulent combustion process is described with Reynolds stress turbulence model, eddy-dissipation turbulent combustion model, P-1 radiation model and particle tracking model of liquid. The flow in the rotating combustion chamber is simulated at two different working speeds, 0 r/min and 1 000 r/min by Fluent software. The temperature, gas velocity, static pressure of wall and fuel concentration are computed and compared. The results show that the combustion in rotating combustor is faster and more effective. 相似文献
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This paper attempts to do a research on the development of software defined radio(SDR) based on software communication architecture(SCA). Firstly, SCA is studied and a whole reference model of SCA3.0 core framework (CF) is realized; Secondly, an application-specific FM3TR waveform is implemented on the platform of common software based on the reference model; Thirdly, from the point of view of real-time performance and software reuse, tests and validations are made on the above realized CF reference model and FM3TR waveform. As a result, the SCA-compliant SDR has favorable interoperability and software portability and can satisfy the real-time performance requirements which are not too rigorous. 相似文献
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In mechanical, hydraulic and electronic systems, the determination of system parameters is often challenging because liquid parameters often change significantly, due to variations in working and environmental conditions. Therefore, it is of significant practical importance to identify those parameters through experimental procedures. A systematic approach to identifying parameters in the valve controlling cylinder system of hydraulic manipulators is provided. It first derives the transfer function of the system, and then uses P control of PID control to predict system parameters. The predicted parameters are further validated using PID control. The prediction through simulation using MatLab language is utilized, which agrees well with experimental results. 相似文献
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By using the ATV module of MSC. ADAMS, the dynamic simulation of recoil response of tank gun is analyzed.How the recoil force affects the bodywork and the suspension during gun firing, as well as the changing status of the gun muzzle‘s velocity are gained. All results and analyzing methods are offered for the designing basis of optimizing tank vehicle-gun match. The constructive exploration is beneficial to improving the general capability of tank. 相似文献
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The controllable suspension system can improve the performances of off-road vehicles both on road and cross-country. So far, four controllable suspensions, that is, body height control, active, semi-active and slow-active suspensions, have been developed. For off-road vehicles, the slow-active suspension and the semi-active suspension which have controllable stiffness, damping and body height are more appropriate to use. For many years, some control methodologies for controllable suspension systems have been developed along with the development of modern control theory, and two or more original control methods are integrated as a new control method. Today, for military or civilian off-road vehicles, the R&D of controllable suspension systems is ongoing. 相似文献
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Protocols for key management are compared and evaluated from the point of view on mobile ad hoe networks (MANET). The issues of fault-tolerance and efficiency of key distribution protocols for group communications in MANET are addressed. Most key distribution protocols existing today are primarily designed for wlre-line networks. These protocols either fail to work as intended or cannot work at all when they are applied to the demanding environment of MANET. Parameters and performance of different protocols are analyzed, and then a fiat is given out, on which new protocols or existing ones are designed and modified, so that they can be robust, scalable and efficient in MANET. 相似文献
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Finite Element Analysis of Fretting Behavior Between an Engine Cylinder Block and a Main Bearing Cap
The finite element analysis of the fretting behavior between a cylinder block and a main bearing cap is presented. The stresses, relative fretting slip, fretting friction work parameter W and crack initiation location parameter G on the fretting contact surface of the cylinder block are obtained and analyzed. It shows that the fretting fatigue problem of the cylinder block can be quantitatively explained by W or G. The effects of pretightening force, friction factor and material combination of the cylinder block and the main bearing cap are studied. The computational results indicate that the fretting fatigue of the cylinder block can be allayed by increasing the elastic modulus of the cylinder block, but not by changing the other two factors. 相似文献
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Electromagnetic armor is a new conceptual combat vehicle technology, which improves remarkably the defensive capability and maneuverability of vehicles. The authors present definitely to apply the electromagnetic theory to analyze the electromagnetic armor. Based on electromagnetics, the experienced expression of projectile and the physical model of PEMA (passive electromagnetic armor) are obtained when electric current flows through the system, and a computer sim- ulation is given. 相似文献
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Through analyzing the kinematics of the hydraulic manipulator operating system, according to the rules for set-ing up the D-H coordinate system, the generalized coordinate of the manipulator system is established. The rotating and moving joints are selected from the mechanism as joint variables. Each generalized transformation matrix of joints is worked out. The kinematics equation at the finger end of the manipulator is calculated. The obverse solution for the manipulator is gained. The geometrical operating parameters and primary technical specification of the manipulator system are simulated through the computer. The simulative result has shown that the manipulator operating system meets the working task requirements. This research provides theoretical basis for optimizing structural parameters of the manipulator operating. So it also is justified the feasibility for mechanical manipulators to be used in the engineering equipment platform of the hydraulic excavator. 相似文献