Sensitivity Analysis and Optimization of Geometric Parameters of a New Fluid Bag Buffer Mechanism on Buffering Performance  

新型流体袋缓冲机构的几何参数对缓冲性能的敏感性分析和优化

作　　者：WANG Hongxian HOU Yu ZHANG Ming NIE Hong 王洪宪;侯聿;张明;聂宏(南京航空航天大学中小型无人机先进技术工业和信息化部重点实验室,南京210016;南京航空航天大学飞行器先进设计技术国防重点学科实验室,南京210016;南京工业职业技术大学航空工程学院,南京210023;南京航空航天大学机械结构力学及控制国家重点实验室,南京210016)

机构地区：[1]Key Laboratory of Advanced Technology of Small and Medium-Sized UAV Ministry of Industry and Information Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,P.R.China [2]State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,P.R.China [3]School of Aeronautic Engineering,Nanjing Vocational University of Industry Technology,Nanjing 210023,P.R.China [4]Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,P.R.China

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2022年第5期569-583,共15页南京航空航天大学学报（英文版）

基　　金：supported by the Fun⁃damental Scientific Research Business Expenses of Central Universities(No.NJ2020024).

摘　　要：A new fluid bag buffer mechanism,which can provide large axial stiffness under the small displacement,is designed.The dynamic change laws of the mechanism stiffness and the internal pressure of the fluid bag are studied when it is subjected to impact load.According to the protection performance for the flexible joint and the pressure change in the fluid bag during the impact process,the sensitivity of the geometric parameters of the fluid bag to the axial stiffness is analyzed by using the orthogonal experimental method,and the optimal parameter combination of the geometric parameters of the fluid bag under impact is obtained,leading to the displacement of the inner shell reduce by 41.4%.The results show that the internal pressure of the fluid bag is a rising process of oscillation and fluctuation.The sensitivity of the geometric parameters of the fluid bag to the displacement of the inner shell from high to low is as follows:Height H,radius r,wall thickness t,chamfer A.The correlation between the geometric parameters of the fluid bag and its internal pressure is:H is negatively correlated with the internal pressure,while the r,t,and A are positively correlated with the internal pressure.设计了一种能在小位移条件下提供轴向大刚度的流体袋缓冲机构。研究了当它受到冲击载荷时,机构的刚度和流体袋内部压力的动态变化规律。针对受冲击过程中对柔性接头的保护性能和流体袋内部的压力变化,采用正交实验设计方法,分析了流体袋各几何参数对轴向刚度影响的敏感性,得出了受冲击时流体袋各几何参数的最优参数组合,该参数组合可以使内壳的位移减少41.4%。结果表明:流体袋受冲击后,其内部压力是一个振荡波动的上升过程;流体袋各几何参数对机构轴向刚度的敏感性高低顺序为:高度H、半径r、壳厚t、倒角A;流体袋各几何参数和流体袋内部压力的相关性关系为:高度H和内部压力为负相关关系,半径r、壳厚t、倒角A和内部压力为正相关关系。

关 键 词：fluid bag buffer mechanism flexible joint axial stiffness characteristics orthogonal experiment method internal pressure of fluid bag 

分 类 号：TH135[机械工程—机械制造及自动化]