【作者】 王子文；

【导师】 牛少华；

【作者基本信息】 北京理工大学 ， 力学， 2016， 硕士

【摘要】 随着现代弹药智能化的发展,对引信的控制功能也不断拓展。在某些情况下要求引信的安全系统不再是单向工作方式,即:由保险状态→解保状态,而具有可恢复的性能即:可由电解保状态恢复至安全状态。因此就需要用运动可恢复式机构或驱动器来代替原有的推销拔销等机构。传统的电机驱动方式由于其结构控制系统复杂,体积大,功耗大等缺点已经不能满足该环境下的驱动。而基于介电型EAP的驱动器具有应变大,能量密度高,电---机能量转换效率高,响应速度快,结构简单,质量轻,价格低廉其加工制造方便,可以设计成多种形状实现柔性驱动等特点,在引信安全系统中具有潜在的应用前景。但由于对材料研究尚未成熟目前还停留在实验室阶段,对驱动器的设计也是在设计后进行整体试验测试,通过实验对驱动器的参数进行设计带来了很多不确定因素。本文针对上述情况以VHB4910介电弹性体材料为对象,对材料的力学性能进行了分析,通过给出了基于yeoh应变能模型以及prony级数粘弹性模型的材料参数,通过对圆形驱动器的实验测试结合仿真和理论分析给出了介电弹性体薄膜驱动器的力电转换规律。并分析了基于薄膜褶皱理论的破坏限制条件。在对材料特性分析的基础上,设计了一种具体的圆柱形驱动器的线性驱动,并对该类型驱动器的驱动特性进行了分析和研究。通过理论及数值计算给出了驱动器空载致动位移随预拉伸率以及预载荷刚度变化而变化的规律。此外结合引信安全系统应用需求,对小体积情况下驱动器的特性进行了分析,给出了层间作用对驱动器的影响规律.通过本文的研究工作为基于介电型EAP驱动器的应用设计及其在引信系统中的应用奠定了一定基础。更多还原

【Abstract】 As the development of Smart ammunition, the controlling function of the fuze is also expanding. In some cases, the safety system of the fuze is no longer a one-way operation, which is to say the state of fuze can just change form safe position to arming condition, but can be recovered to a safe state. Therefore, we need to use the recoverable type structure to replace the original pushing and puling pins structures. The traditional motor drive mode can not meet the conditions since the traditional structure is complex with large volume and large power consumption. The actuators based on DE have high strain, high energy density, high energy conversion efficiency, fast response. And the structure is simple with light weight, low cost, easy processing and manufacturing which can be designed into a variety of shapes to achieve flexible drive and so on. However, due to the material research is not yet mature, the designing of the actuators is always going by testing large numbers of the actors. This kind of designing work will bring a lot of uncertainty.In this paper, the mechanical properties of the material are analyzed by testing VHB4910. The material parameters of the Prony viscoelastic model and the Yeoh strain energy model are given. The law of mechano-electric transducing is found from the experimental test of the circular drive. Based on the theory of membrane wrinkling, the failure criterion of the film is analyzed.On the basis of analyzing the characteristics of the material, a cylindrical actuator is designed, and the driving characteristics of this type of actuator are analyzed. By theoretical and numerical calculation, the law of the change of the driving displacement caused by the change of the pre-draft ratio and the stiffness of the spring is presented. In addition, the characteristics of the actuator when it is miniaturized in the size are analyzed, and the effects of the interaction between the layers are presented. The research in this paper lay the foundation of designing the dielectric EAP driver and applying this kind of actuators to the fuze system.更多还原