【作者】 钟伟俊；

【导师】 张嘉钟；

【作者基本信息】 哈尔滨工业大学 ， 一般力学与力学基础， 2011， 硕士

【摘要】 当水下航行体在一定速度下运动时会在弹体表面生成超空泡,这时水下航行体的粘湿面积可以达到最小状态,使水下航行体表面的液体摩擦阻力降到很小的值,是实现水下航行体超高速运动的一种理想手段。超空泡航行体在300m/s到1000m/s航速下,航行体与空泡壁发生连续的碰撞即尾拍现象。在连续的尾拍冲击作用下,航行体的结构动力学特性不同于传统的航行器。本文采用理论和仿真研究的手段对尾拍过程中,变深度航行时超空泡航行体的尾部激振力和结构振动特性进行了研究。主要内容如下:在前人的基础上,对小型超空泡射弹变深度航行时的尾拍冲击载荷进行了研究,得出了变深度航行时尾拍载荷的时间变化形式,通过计算得出航行深度对尾拍运动的影响。在尾拍载荷研究基础上,对射弹变深度航行时尾拍振动的结构响应进行了仿真模拟。得到了弹体各部位应力应变随时间的变化和频域特性,以及弹体加速度响应的时域和频域特性。应用流固耦合仿真分析方法对变深度航行时尾拍载荷进行了研究,得出深度和角速度对尾拍运动的影响。本文的研究结果,可以为以后的超空泡航行体尾拍振动方面的实验研究提供参考,并为超空泡航行体的结构优化设计等工作提供必要的基础。更多还原

【Abstract】 Moving in a certain speed, underwater vehicle will produce supercavitation on the surface .At the same time, its sticky area reach to the minimum and this make fluid friction of surface reach to the minimum. Theoretically, the underwater vehicle will reach to the ultra-high speed in this situation. When the vehicle move in the speed from 300m/s to 1000m/s, it will make lasting tail-slaps to keep balance. Under the impact of the continuing tail-slaps, the structure of underwater vehicle is different from the traditional vehicle. In this paper we use theoretical and simulation methods to do some research on the tail exciting force and vibration characteristics of supercavitation underwater vehicles in the tail-slaps process. Main content as follows:Based on the last research,we do the research on the vibration characteristic of Supercavitation high-speed projectile navigation in different depths. Also,we get the time variations of tail-slaps in variable depth navigation and the effect of variable depth on tail-slaps.Based on the tail slaps research, we study structural response simulation of tail-slaps vibration when supercavitation projectile move in the different depth. We get the time domain and frequency domain characteristics of projectile body parts stress and acceleration response. Using FSI simulation analysis, we do the research on the tail-slaps vibration structure response in the high-speed navigation and get depth and angular velocity effect on the tail beat movement.The results of this study can provide reference to the supercavitating vibration experiment and become the necessary basis of the work the supercavitation structure optimization design.更多还原