【作者】 彭刚； 徐雷； 张大义；

【Author】 PENG Gang~(1,*),XU Lei~1,ZHANG Dayi~2 1.Guizhou Institute of Aviation Engine,China Aviation Industry Corporation,Guiyang 210016,China 2.School of Jet Propulsion,Beihang University,Beijing 100191,China

【机构】 中航工业集团公司贵州航空发动机研究所； 北京航空航天大学能源与动力工程学院；

【摘要】 高推重比/功重比燃气涡轮发动机的承力系统设计中,减重设计降低了结构刚性,从而使得静子与转子的振动耦合程度越来越大,因此在中介机匣设计中,应当充分考虑其振动特性和动刚度特征。采用有限元方法,针对某涡扇发动机中介机匣进行固有振动特性、振动响应以及动刚度分析。分析结果表明在低频段内中介机匣各阶模态以外涵道机匣的局部振动为主,而靠近各轴承支点位置的振动较小,各支点位置具有较高的动力学稳定性;当3号支点上的高压转子不平衡激励通过中介机匣传递给安装节时,振动响应衰减量很大,中介机匣结构设计表现出很好的振动衰减性。更多还原

【Abstract】 The coupled vibration of stator and rotor are especially outstanding because of the low supporting stiffness in high thrust weight ratio turbo engines,therefore the vibration characteristics and dynamic stiffness should be considered during the supporting structure design.The natural characteristics,vibration response and dynamical stiffness of a certain turbo fan engine are studied and some useful results are obtained.At low frequency spectrum,only the outer casing vibrates,while the vibration amplitudes near the bearings are low.So the dynamical stabilities of the bearings are good.While the unbalance load is transferring from bearing to mount,the decay of vibration is obvious,which shows the good damping of the intermediate casing.更多还原