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为满足某火箭发动机燃气发生器固定连接结构长期贮存和长时间高温环境下可靠工作的要求,在保证原固定连接结构形式不变的前提条件下提出了改进设计方案。新的方案采用不锈耐酸钢和高温合金钢替换原普通碳钢,同时采用了新的焊接工艺方法。为了验证新卡箍连接强度和动态特性,进行了模态分析和动应力/动应变理论计算、强度破坏和振动试验。最后通过地面热试车和飞行试验对改进设计方案进行了验证,结果表明新的卡箍提高了结构连接可靠性,完全满足发动机使用要求。
In order to meet the requirements of long-term storage of the fixed connection structure of a rocket engine gas generator and reliable operation under a long time high temperature environment, an improved design scheme is proposed on the premise of ensuring the original fixed connection structure form unchanged. The new program uses stainless steel acid-resistant steel and high-temperature alloy steel to replace the original ordinary carbon steel, using a new welding process. In order to verify the connection strength and dynamic characteristics of the new clamp, modal analysis and theoretical calculation of dynamic stress / dynamic strain, strength failure and vibration test were carried out. Finally, the improved design scheme was verified by the ground thermal test and flight test. The results show that the new clamp improves the structural connection reliability and fully meets the engine requirements.