Application and Verification of the Modal Synthesis Method in Dual-rotor System Modeling
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摘要: 为寻求一种便捷的双转子系统的建模和模型维数缩减方法,开展了ANSYS有限元商用软件和固定界面模态综合法在双转子系统中建模中的应用研究。由ANSYS获取系统的质量矩阵和刚度矩阵,建立系统的运动方程,并利用固定界面模态综合法实现系统方程维数的缩减。利用模态质量矩阵和模态刚度矩阵的特性验证了系统参数的正确性;进行了系统临界转速特性计算,利用ANSYS软件(有限元方法)计算结果进行了对比验证,并分析了模态截止频率对临界转速的影响;开展了双转子系统的匀变速过程的瞬态分析,进行了试验验证。结果表明:建模方法正确、可靠,并能便捷地进行双转子响应特性的计算。Abstract: In order to seek a convenient method to modeling the dual-rotor system and reduce the dimensions, applications of the fixed interface modal synthesis method and the finite element software ANSYS on dual-rotor systemmodeling are studied.Motion equation is established with mass matrix and stiffness matrix obtained from ANSYS.Then the dimensions are reduced by the fixed interface modal synthesis method.Correctness of the system parametersis verified by the characteristics of modal mass matrix and modal stiffness matrix.Critical speed characteristics arecalculated, the results of which are verified with that of ANSYS(finite element method).Besides, the modal cut-offfrequency's effect on critical speed is analyzed.The transient analysis of the uniformly changed velocity process iscarried out and verified by experiments.The research shows that: modeling method in this paper is correct andreliable, and can be easily used to calculate the response characteristics of the dual-rotor system.
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Key words:
- critical speed /
- dual-rotor /
- dynamic response /
- equations of motion /
- finite element method
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