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本文试图把模态综合法与有限元素法相结合,对发动机转子——支承——机匣系统的整机振动特性进行分析。用状态空间广义模态综合法计算轴对称转子与机匣间的耦合振动,用复模态综合法计算非轴对称转子与机匣间的耦合振动。子结构分析采用有限元素法。转子采用具有粘性阻尼,考虑剪切变形的有限转子元素,用承受非轴对称载荷的截锥壳元素离散机匣。所编制的AROBEC程序可计算发动机整机系统的进动频率、临界转速、稳定性、不平衡响应及瞬态响应。目前该程序已实际应用于三种型号的发动机上,获得了满意效果。
This article attempts to combine the modal synthesis method with the finite element method to analyze the vibration characteristics of the complete engine rotor-support-receiver system. The coupling vibration between the axisymmetric rotor and the casing is calculated by the generalized modal synthesis method in the state space and the coupling vibration between the non - axisymmetric rotor and the casing is calculated by complex modal synthesis method. Substructure analysis using finite element method. The rotor uses viscous damping, considering the finite deformation of shear rotor elements, with a non-axisymmetric load truncated cone element shell discrete casings. The programmed AROBEC program calculates the precession frequency, critical speed, stability, unbalance response and transient response of the complete engine system. At present, the program has been actually applied to three types of engines, with satisfactory results.