固体火箭发动机工作压强对柔性接头性能的影响  

Influence of Solid Rocket Motor Working Pressure on the Performance of Flexible Joints

作　　者：李国才 刘凯 王亦松 李瑾 郑永秋[2] LI Guocai;LIU Kai;WANG Yisong;LI Jin;ZHENG Yongqiu(Xi’an Institute of Aerospace Propulsion Technology,Xi’an 710025,China;State key Laboratory of Extreme Environment Optoelectronic Dynamic Measurement Technology and Instrument,North University of China,Taiyuan 030051,China)

机构地区：[1]西安航天动力技术研究所,陕西西安710025 [2]中北大学极限环境光电动态测试技术与仪器全国重点实验室,山西太原030051

出　　处：《中北大学学报(自然科学版)》2025年第2期157-164,共8页Journal of North University of China(Natural Science Edition)

摘　　要：高工作压强对柔性接头会产生各种不良影响,甚至会导致柔性接头产生工作失稳现象,以往的研究并未给出高压下柔性接头摆动力矩降低甚至失稳的原因,因而给柔性接头设计带来困扰。为研究高工作压强下柔性接头的受力与工作机理情况,本文以某高压强工况柔性接头为研究对象,通过ABAQUS有限元软件建立了柔性接头仿真模型,数值模拟了不同压强柔性接头的变形及摆动工况,并分析了容压对柔性接头高度及摆动力矩的影响;对柔性接头不同容压下的高度及摆动力矩进行了试验测试,可以得出柔性接头高度变化最大偏差在12%以内,摆动力矩最大偏差在10%以内,验证了有限元模型的正确性;最后得到了柔性接头高度及摆动力矩与容压的关系,给出了计算公式并进行了简便计算,相关结果可用于指导工程设计。本文根据柔性接头的变形以及摆动力矩变化的趋势,从宏观角度分析了柔性接头摆动力矩在高容压下降低的原因,即随着容压的升高,柔性接头因变形引起的受力不对称性导致摆动力矩不断降低直至失稳;另外,本文给出了评价柔性接头稳定性的方法,为后续柔性接头设计提供了参考。High working pressure can result in various adverse effects on the flexible joints,and even cause operational instability.Previous research has been inadequate in explaining the factors contributing to the diminished shaking torque or its instability in flexible joints subjected to high pressure,which brings troubles to the design of flexible joints.In order to study the force and working mechanism of flexible joints under high working pressure,flexible joints under high pressure and strong working conditions were taken as the research object in this paper,a simulation model of flexible joint was established by ABAQUS finite element software.Numerical simulations were performed to analyze the influence of pres-sure on the height and swing torque of flexible joints,and further experimental tests were carried out.The maximum deviation of the flexible joint height change is within 12%,and the maximum deviation of the swing torque is within 10%,thus confirming the precision of the finite element model.The relation-ship between the height and the shaking moment of the flexible joint and the pressure was ultimately deter-mined.Calculation formulas were provided to streamline the guidance for engineering design.Considering the trends of deformation and shaking moment of the flexible joint,a macroscopic analysis was conducted for the first time to investigate the decrease in shaking moment of the flexible joint under high volumetric pressure.With the increase of volumetric pressure,the asymmetry of forces caused by deformation of the flexible joint results in decrease of the shaking moment until instability.A method was proposed to assess the stability of the flexible joint,offering guidance for subsequent flexible joint design.

关 键 词：柔性接头 失稳 高压强 摆动力矩 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]