摘要
横向冲击试验机是考核舰艇设备抵抗水下非接触爆炸冲击性能的关键设备,用于模拟正、负波冲击下船体的响应。被试设备安装在冲击台面上,正波冲击时,设备对冲击台产生巨大的倾覆力矩同时设备向冲击缸一侧倾斜,负波冲击过程中由于设备振荡使冲击台的导轨产生周期性的正压力和摩擦力。用有限元方法分析了该冲击台摩擦力及运动规律,发现:倾覆力矩作用到导轨上,使燕尾槽导向产生很大的接触力和摩擦力。导轨之间的摩擦力对冲击台的输出波形有显著影响,不仅使正波加速度峰值显著增加或减小还使负波的波形呈现锯齿状。燕尾槽的摩擦力降低了冲击台的峰值速度,使负波过程提前结束,减少了冲击台的位移,并对冲击响应谱低频段产生严重影响。该研究对于横向冲击试验机的设计具有一定的指导意义。
The transverse shock testing machine is the important equipment for testing naval craft against the underwater non-contact explosive,which used to simulate the hull's response under the positive and negative wave shock.The tested equipment is installed on the shock table.When positive wave shock,the device produce a huge overturning moment to the equipment.And at the same time,the device tilt to the shock cylinder side.The rail of shock table produce the periodic positive pressure and friction because of equipment oscillation during the negative wave shock process.The friction force and motion law of the bounce table was analyzed by finite element method.It was found that the dovetail guide creates a huge contact force and friction force was made by overturning moment acts on the rail.The friction makes a significant effect on output waveform of bounce table,not only the positive wave acceleration peak significantly increasing or decreasing but also make negative wave appear jaggy.Friction force of the dovetail groove reduces the peak speed of the bounce table,make the negative wave process finish in advance and reduce displacement of the bounce table,and made the SRS appears serious deviation.The researches have a certain significant guidance on the design of transverse shock testing machine.
关键词
燕尾槽
倾覆力矩
摩擦力
运动规律
冲击谱
Dovetail Groove
Overturning moment
Friction
Motion Pattern
Shock Spectrum
