随机载荷下内燃机轴系动力可靠性分析
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摘要
综合考虑内燃机轴系激振力矩随机性以及刚度非线性的影响,建立轴系扭纵耦合非线性动力学模型,利用虚拟激励法求解轴系的随机响应,并基于首次超越破坏准则,分析了轴系在随机载荷作用下的动力可靠性。仿真计算结果表明,平稳随机激励的动力可靠性要高于非平稳随机激励,纵向振动、发火间隔角、随机激励的强度和传递路径对轴系动力可靠性均有一定的影响。
In order to improve the design level of engine,a coupled torsional-axial nonlinear dynamic model for the shafting of engine was established considering random characteristics of the excitation torque on the shafts of engine and nonlinear stiffness factor.The stochastic responses of the shafting were calculated by the pseudo-excitation method,and the dynamic reliability of the shafting subject to random loads was analyzed using first excursion failure criterion model.The simulation results showed that the dynamics reliability of crankshaft subject to stationary random excitations is higher than that subject to non-stationary random excitations,and the axial vibration,fire angle,intensity and transfer paths of the excitations have influences on the dynamic reliability of the shafting.
In order to improve the design level of engine,a coupled torsional-axial nonlinear dynamic model for the shafting of engine was established considering random characteristics of the excitation torque on the shafts of engine and nonlinear stiffness factor.The stochastic responses of the shafting were calculated by the pseudo-excitation method,and the dynamic reliability of the shafting subject to random loads was analyzed using first excursion failure criterion model.The simulation results showed that the dynamics reliability of crankshaft subject to stationary random excitations is higher than that subject to non-stationary random excitations,and the axial vibration,fire angle,intensity and transfer paths of the excitations have influences on the dynamic reliability of the shafting.
引文
[1]梁价,雷拳忠.内燃机的振动问题[M],天津:天津大学出版社,1989:98-103.
[2]Lee Y L,Morrissey W.Uncertainties of experimental crankshaft fatigue strength assessment[J].International Journal of Materials and Product Technology,2001,16(4,5):379-392.
[3]求晓明,任乐鸣,钱泱,等.AGC方式运行对水力机组振动影响的可靠性评估[J].振动、测试与诊断,2003,23(2):137-141.
[4]Choi K S,Pan J.Simulations of stress distributions in crankshaft sections under fillet rolling and bending fatigue tests[J].International Journal of Fatigue,2009,31(3):544-557.
[5]Paul S,Simon H,Lee Y L.Assessment of bending fatigue limit for crankshaft sections with inclusion of residual stresses[J].International Journal of Fatigue,2007,29(2):318-329.
[6]Bayrakceken H,Tasgetiren S,Aksoy F.Failures of single cylinder diesel engines crank shafts[J].Engineering Failure Analysis,2007,14(4):725-730.
[7]舒歌群,吕兴才.高速柴油机曲轴扭转-纵向耦合振动的研究[J].兵工学报,2002,23(1):1-5.
[8]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004:49-50.
[9]Atalik T S,Utku S.Stochastic linearization of multi-degree of freedom non-linear systems[J].Earthquake Engineering&Structural Dynamics,1976,4:411-420.
[10]李桂青,曹宏,李秋胜,等.结构动力可靠性理论及其应用[M].北京:地震出版社,1993:63-65.
[11]辛宇辉.CY4102BZQ柴油机轴系动态特性研究及有限元分析[D].天津:天津大学,2003.
[2]Lee Y L,Morrissey W.Uncertainties of experimental crankshaft fatigue strength assessment[J].International Journal of Materials and Product Technology,2001,16(4,5):379-392.
[3]求晓明,任乐鸣,钱泱,等.AGC方式运行对水力机组振动影响的可靠性评估[J].振动、测试与诊断,2003,23(2):137-141.
[4]Choi K S,Pan J.Simulations of stress distributions in crankshaft sections under fillet rolling and bending fatigue tests[J].International Journal of Fatigue,2009,31(3):544-557.
[5]Paul S,Simon H,Lee Y L.Assessment of bending fatigue limit for crankshaft sections with inclusion of residual stresses[J].International Journal of Fatigue,2007,29(2):318-329.
[6]Bayrakceken H,Tasgetiren S,Aksoy F.Failures of single cylinder diesel engines crank shafts[J].Engineering Failure Analysis,2007,14(4):725-730.
[7]舒歌群,吕兴才.高速柴油机曲轴扭转-纵向耦合振动的研究[J].兵工学报,2002,23(1):1-5.
[8]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004:49-50.
[9]Atalik T S,Utku S.Stochastic linearization of multi-degree of freedom non-linear systems[J].Earthquake Engineering&Structural Dynamics,1976,4:411-420.
[10]李桂青,曹宏,李秋胜,等.结构动力可靠性理论及其应用[M].北京:地震出版社,1993:63-65.
[11]辛宇辉.CY4102BZQ柴油机轴系动态特性研究及有限元分析[D].天津:天津大学,2003.
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