磁流变阻尼器的力学特性及其在火炮反后坐中的应用研究

【作者】 臧传相；

【导师】 谈乐斌； 侯保林；

【作者基本信息】 南京理工大学 ， 武器系统与运用工程， 2011， 硕士

【摘要】 磁流变阻尼器作为一种新型智能化阻尼装置,它已被广泛用于振动控制领域,并且已经获得了成功。本文以两不同结构的阻尼器为研究对象,并对此进行了相关的研究工作。具体包括以下四方面：1、对所研究的阻尼器内部的磁路和流场分别进行有限元分析。通过ANSYS软件首先对磁路进行分析,得到不同励磁电流下阻尼间隙中的磁通密度分布图,经过统计分析获得阻尼间隙中的磁感应强度值随励磁电流的变化曲线趋势图。然后根据磁路分析结果再对流场进行分析,获得不同屈服应力下流场内部的压差值,分析了阻尼力的可控性和速度的可控区域。2、根据流体力学知识,推导阻尼器的准静态模型,并设计拉伸试验,通过试验数据对准静态模型中的参数进行辨识。被辨识的目标函数为不连续函数,本文采用遗传算法和直接搜索方法相结合的方法进行优化分析,并对辨识后的准静态模型进行分析,获得了阻尼器的力学特性。3、对火炮磁流变反后坐装置进行理论分析,主要完成火炮的后坐过程仿真。仿真过程中阻尼器的力学模型考虑了磁流变液的流动惯性,为偏微分方程,本文采用有限差分法进行求解。仿真结果表明了考虑流动惯性力的必要性,并发现通过控制电流值的大小,可以达到控制后坐阻尼力的峰值、后坐位移和后坐速度的目的。4、设计冲击试验,测试了阻尼器在冲击力作用下的可控性。最后,对全文进行了总结,介绍了全文的特色和创新之处,并指出今后工作有待深入研究的问题。更多还原

【Abstract】 As a new type of intelligent damper device, magneto-rheological(MR) damper has been increasingly widely used in various of vibration suppressions and did well. This dissertation bases on the MR damper and mainly includes the followings.1. Based on the finite element method, the magnetic circuit and the flow field of MR Mechanism were studied. Firstly through the ANSYS software to analysis the magnetic circuit and obtained the curve of the flux density in the gap with the current. Then, the flow field with different yield stress was studied and obtain the pressure difference. Lastly, studied the controllability of damping force and speed of the controlled area.2. Using the theory of hydrodynamic, a quasi-static model was established. Then, tensile test on the MR damper was investigated. The results of the test was used for the recognization of the quasi-static model. In this dissertation, the model was recognized by genetic algorithms for the strongly non-linear reason. The recognized model reflects the mechanical characteristics of the MR damper.3. Study the effect of Gun Anti-Recoil Mechanism equipped with MR damper. The artillery recoil process was simulated numerically.In this Process, the flow inertia of the MR fluid was considered and the fluid dynamics equation of the MR damper was solved by the finite difference method. The simulation results shown that it’s necessary to consider the flow inertia in high speed impact field and through controlling current, we can get the purpose to controll the recoil displacement and the Peak Value of the recoil resistance and speed.4. In order to investigate the controllability of the MR damper on the condition of impact, a impact test was done.Finally the work of this dissertation was concluded. The innoviations and contribution of this work were introduced. And also, the potential issues of this research were pointed out.更多还原