航空发动机安装系统动力学设计技术研究
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摘要
航空发动机安装系统具备传递发动机推力和隔离发动机振动的作用,为典型的空间六自由度隔振系统,难以直接采用单自由度隔振理论进行设计。针对这一问题,基于发动机惯量与安装系统弹性参数优化匹配的振动解耦理论,提出了发动机安装系统的动力学设计方法,开展了典型涡桨发动机全尺寸安装系统的六自由度隔振设计,并对发动机安装系统中多个隔振点的三向刚度参数进行了优化配置,为隔振器的结构设计提供了参数输入。进一步利用ADAMS对所设计的发动机安装系统进行了多体动力学分析,结果表明:发动机安装系统各方向的振动解耦率获得了理想效果,各方向可视为独立振动,从而可采用单自由度隔振理论进行设计,且各阶模态频率均很好地满足了隔振要求,验证了设计方法的有效性。
Aero-engine mounting system has the function of transmitting engine thrust and isolating engine vibration. It is a typical space 6-DOF vibration isolation system and it is difficult to directly design using the single-degree-of-freedom vibration isolation theory. To solve this problem,a dynamic design method of engine mounting system is proposed based on the theory of vibration decoupling,which is based on the optimization of engine inertia and the elastic parameters of the mounting system. A six-freedom vibration isolation design of typical full-size turboprop engine mounting system was carried out,and the three-dimensional stiffness parameters of multiple vibration isolation points in the engine mounting system were optimally configured to provide parameter input for the structural design of the vibration isolator. The multi-body dynamic analysis of the designed engine mounting system was further carried out using ADAMS. The results show that the vibration decoupling ratio in all directions of the engine mounting system has achieved the desired effect,and all directions can be regarded as independent vibration so that the single degree of freedom Vibration isolation theory can be used,and the modal frequencies of each order satisfy the requirement of vibration isolation well,which verifies the effectiveness of the design method.
Aero-engine mounting system has the function of transmitting engine thrust and isolating engine vibration. It is a typical space 6-DOF vibration isolation system and it is difficult to directly design using the single-degree-of-freedom vibration isolation theory. To solve this problem,a dynamic design method of engine mounting system is proposed based on the theory of vibration decoupling,which is based on the optimization of engine inertia and the elastic parameters of the mounting system. A six-freedom vibration isolation design of typical full-size turboprop engine mounting system was carried out,and the three-dimensional stiffness parameters of multiple vibration isolation points in the engine mounting system were optimally configured to provide parameter input for the structural design of the vibration isolator. The multi-body dynamic analysis of the designed engine mounting system was further carried out using ADAMS. The results show that the vibration decoupling ratio in all directions of the engine mounting system has achieved the desired effect,and all directions can be regarded as independent vibration so that the single degree of freedom Vibration isolation theory can be used,and the modal frequencies of each order satisfy the requirement of vibration isolation well,which verifies the effectiveness of the design method.
引文
[1]V F Shmyrov.Airplane power plants systems designing[M].Kharkiv Aviation Institute,2010.
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[9]童炜,陈建斌,宋晓琳.基于ADAMS的发动机悬置系统多目标优化[J].汽车工程,2011,33(11):971-975.
[10]户原春彦著.防振橡胶及其应用[M].北京:中国铁道出版社,1982.
[2]E S Taylor,et al.Vibration isolation of aircraft power plants[J].Journal of the aeronautical sciences,1938-6:43-50.
[3]H Ashrafiuon.Design optimization of aircraft engine-mount systems[J].Journal of vibration and acoustics,1993,115:463-467.
[4]D A Swanson,et al.Optimization of aircraft engine suspension systems[J].Journal of aircraft,1993,30(6):979-984.
[5]G O Hrycko.Design of the low vibration turboprop power plant suspension system for the DASH7 aircraft[J].Business Aircraft Meeting&Exposition,Wichita,Kansas,April 12-15,1983.
[6]Eugene I.Rivin著.被动隔振[M].武汉:海军工程大学出社,2004.
[7]方同,薛璞.振动理论及应用[M].西安:西北工业大学出版社,2004.
[8]赵建才,等.车辆动力总成悬置系统的能量法解耦仿真分析[J].上海交通大学学报,2008,42(6):878-881.
[9]童炜,陈建斌,宋晓琳.基于ADAMS的发动机悬置系统多目标优化[J].汽车工程,2011,33(11):971-975.
[10]户原春彦著.防振橡胶及其应用[M].北京:中国铁道出版社,1982.