摘要
运载火箭发动机喷流噪声是引起火箭舱段随机振动环境的主要因素;对于固液捆绑火箭而言,多个固体助推发动机与芯级液体发动机喷流噪声的组合捆绑效应将使舱段高频随机振动环境更为恶劣,尤其是对于靠近发动机喷口的固体助推发动机尾舱。文章重点针对某固液捆绑火箭试样阶段的固体发动机尾舱设备与支架安装面在噪声激励作用下的高频随机振动环境,采用有限元分析(FEA)方法进行随机振动环境优化分析。结果表明,增加单机设备支架厚度能明显改善单机设备安装面的高频随机振动响应。据此重新设计单机设备支架并进行试车实测,结果与仿真预示结果间的最大偏差未超出工程上一般要求的±3 dB偏差范围,验证了该环境优化及预示分析方法的合理可行,可为后续运载舱段在噪声激励下的高频随机振动环境优化预示提供参考。
The jet noise of launch vehicle engine is the main factor causing the random vibration environment of rocket cabin.For the solid-liquid strap-on rocket,the combined bundling effect of jet noise of multiple solid booster engines and core liquid engine will make the high-frequency random vibration of the cabin more severe,especially for the tail cabin of the solid booster engine near the engine nozzle.Focusing on the highfrequency random vibration environment of equipment in a sample-staged tail cabin and their support mounting surface of a solid-liquid strap-on rocket under noise excitation,this paper used the finite element analysis(FEA)method to investigate the optimization of the random vibration environment.The results show that the highfrequency random vibration response of the mounting surface can be significantly improved by increasing the thickness of the equipment support frame.Based on the obtained result,the support of a unit equipment was redesigned and tested.The maximum deviation between the tested results and the simulation predicted results all meet the±3 dB deviation range generally required in engineering.The feasibility of the environmental optimization and prediction analysis methods is verified.The proposed research may provide a reference for the optimization and prediction of high-frequency random vibration for the follow-up carrying cabin under noise excitation.
作者
龙新军
欧阳涵
方贤亮
潘望白
胡迪科
LONG Xinjun;OUYANG Han;FANG Xianliang;PAN Wangbai;HU Dike(Aerospace System Engineering Shanghai,Shanghai 201109,China)
出处
《航天器环境工程》
CSCD
北大核心
2023年第6期605-610,共6页
Spacecraft Environment Engineering
关键词
固液捆绑火箭
噪声激励
随机振动
有限元分析
振动环境优化
solid-liquid strap-on rocket
noise excitation
random vibration
finite element analysis
optimization of vibration environment
作者简介
第一作者:龙新军,高级工程师,主要研究方向为运载器、航天器力学环境设计及动力学仿真。
