某火炮自动供输弹系统和全炮耦合的发射动力学研究
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摘要
本文运用多刚体动力学理论,对某炮自动供输弹系统和全炮耦合运动的发射动力学问题进行了探索研究,主要包括以下几个方面:①基于I-Deas平台和动力学分析软件ADAMS(Automatic Dynamic Analysis of Mechanical System)建立了某自行火炮的全炮及其供输弹系统的三维实体模型;②推导了第一类Lagrange形式的多体动力学方程的显式表达式,建立了相对惯性系运动的全炮动力学模型、供弹系统动力学模型以及供输弹系统与全炮耦合运动的动力学模型。③运用弦振动理论建立了描述供弹机横向振动的理论模型,计及了链传动机构固有的多边形效应和啮入啮出冲击效应,计算获得了方程的数值解,描述了该机构的横向振动特性。④运用电机拖动、液压控制的一般理论建立了某炮供输弹系统驱动环节的数学模型并编制了相应计算程序,通过Adams的数据接口调用这些程序以作为动力参数输入。⑤在动力学模型中大量引入并探讨了碰撞与接触约束,使动力学模型更接近物理模型,从而更具有合理性。并针对现有多体动力学分析软件处理多接触问题不力现象,探索出了一条在Adams中处理多接触问题的有效途径,提出了基于Adams软件的分段仿真概念。以实例证明了分段仿真方法的可行性,研究了分段仿真输出结果的数据结构从而解决了数据的融合问题,并编制程序自动进行数据的融合。⑥提出了一种求解线性方程组的方法—平行投影法,针对ADAMS对超静定系统静态分析不力的情况,研究了求解全炮静态问题的途径和方法,并应用平行投影法求解车体悬挂的初始平衡力,求得了较符合客观事实的解,从而完成了火炮发射前的静态分析。⑦求解了静参考系中供输弹系统的运动、静参考系中全炮发射的动力学过程,以及考虑全炮和供输弹系统相互耦合运动的发射动力学过程。分析了在耦合运动情况下供输弹系统的动态响应以及供输弹动作对全炮动态响应的影响。
This paper focuses on launch dynamics of a self-propelled gun coupled with its automatic ramming system, based on the rigid multi- bodies theory. The main contents are included as follows: The first, three-dimensional models of the whole gun and it's ramming system are constructed by use of the software platforms of I-deas and ADAMS (Automatic Dynamic Analysis of Mechanical System ). The second, the dynamic equations are obtained according to the Lagrange equations of
    the first kind expressed by Euler angles. Then the dynamic equations of the automatic ramming system and the overall gun, as well as the overall gun coupled with it s ramming system are established. The third, the vibration theory of chord is applied to establish the model of the ramming system. The chain organ's polygon effect and it s meshing impact are involved in the model. The transverse vibration of the ramming system is analysed for the solution. The fourth, The models of the drivers are set up by electromotor drive and fluid drive theory, from which the programs are compiled for ADAMS to call in as the input parameters. The fifth, many impacts and contacts are considered in the dynamic models. Then a subsection simulation method is brought forward on the ADAMS software, so as to successfully obtain the solution of these dynamic multi-contacts models. The validity of the subsection simulation method is proved, in which postprocessing technology is widely used. The sixth, the static simulation is neces
    sarily to find out the dynamic system's initial state for dynamic simulation. The gun is looked upon as a hyper-equilibrium structure, and a so-called 'Parallel Projection Method' is brought forward for the gun's static simulation. The seventh, dynamic analyses on the gun, the gun's ramming system, and the overall gun coupled with it's ramming system are simulated.
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