摘要
潜射导弹在出水过程会承受由于空泡溃灭带来的脉动压力,这种脉动压力会引起弹体结构较大的动态响应和动态载荷,弹体结构在水下的模态特性和阻尼特性直接影响出水动载荷和动响应的大小。基于动力学相似模型,采用释放法分别开展了柱体结构在空气中及在水中的模态试验,采用Hilbert变换在时域中对振动衰减信号进行处理,给出了速度加权的平均频率和平均阻尼比。通过干、湿模态参数的比较和分析,获得了水对结构运动的影响参数,水中一阶弯曲振动的阻尼比约为3%,附加质量系数约0.5,刚体运动的附加质量系数约为1,试验研究结果可用于结构响应的分析和计算。
In the process of exiting from water, submarine launched missile will suffer fluctuating pressure due to bubble collapse, which may cause great dynamic response and load in the structure. The underwater modal characteristic and damping characteristic of the missile have a direct influence on the dynamic load and response in the water-exit process. Based on dynamic similitude model, modal tests of cylindrical structure in air and in water are carried out using relief method. Damped vibrating signals are processed in the time domain using Hilbert transformation, and the velocity-weighted average frequency and damping ratio are given. Through comparison between the parameters of dry modal and wet modal, the effecting parameters of water on the motion of the structure are obtained. The damping ratio of the first-order bending vibration mode is approximately 3%, and the added mass coefficient is approximately 0.5, or 1 in the case of rigid body. The results can be used in analysis and calculation of structure response.
作者
王在铎
马斌捷
贾亮
刘思宏
WANG Zaiduo;MA Binjie;JIA Liang;LIU Sihong(Navy Representative Office in China Academy of Launch Vehicle Technology, Beijing 100076, China;Beijing Institute of Structure and Environment Engineering, Beijing 100076, China)
出处
《强度与环境》
2018年第3期15-19,共5页
Structure & Environment Engineering
