摘要
针对低温运载火箭温度低、振动量级大的特点,对低温阀门中动密封用焊接波纹管的加速度响应、动态结构应力等动态特性进行了研究。建立了振动响应仿真模型,模拟阀门在火箭上的真实力学环境及安装状态,计算可知振动过程中波纹管横向加速度响应RMS值放大3倍、纵向加速度响应RMS值放大6倍。考虑波纹管依靠法兰两端固定和旋转对称性,建立了全实体强度分析模型,并对1/12模型进行分析,由结果分析可知各工况下最大应力均出现在波纹管靠近端部的波谷处,且随机振动过程中纵向过载施加在波纹管上应力较大。通过试验进行了验证,试验表明:高温合金材料结构强度满足使用要求,验证了焊接波纹管动态特性数值模拟方法的正确性。
According to the deep-low temperature and complex vibration condition of cryogenic,dynamic characteristic of welded metal bellows which were used as dynamic sealing elements in cryogenic valve was researched in this paper,including acceleration response and dynamic stress of the welded bellows worked with sealing pressure and vibration environment.The vibration analysis model that simulated the mechanical environment and assembled state of valve in the rocket was established.The results showed that the RMS value of lateral acceleration and vertical acceleration was three and six times of the input vibration acceleration level.In addition,considered that the bellows were fixed by flanged ends and the characteristic of rotational symmetry,the solid-element strength analysis model was established,and calculated with 1/12 of the model.The calculated results showed that the maximum stress point located at wave trough near the end of bellows,and the vertical overload due to vibration excitation produced lager stress than that of lateral overload.The test results proved that high-temperature alloy GH4169 met the strength requirement,and proved the correctness of the numerical simulation method used in dynamic analysis of welded bellows.
出处
《上海航天》
2016年第B05期153-157,共5页
Aerospace Shanghai
关键词
焊接波纹管
低温阀门
振动
动密封
数值模拟
动态响应
等效载荷
试验验证
Welded metal bellows
Cryogenic valve
Vibration
Dynamic sealing
Numerical simulation
Dynamic response
Equivalent load
Test verification
作者简介
刘红宝（1984-），男，硕士，主要从事运载火箭阀门产品研究。
