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Zhao Y.-Q.,Harbin Institute of Technology | Li G.-X.,Harbin Institute of Technology | Chang S.,Harbin 703 Research Institute | Zhang X.,Harbin 703 Research Institute
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2010

The study on natural frequency sensitivities to system parameters of two stage planetary gear train with double helical tooth was not reported, though natural frequency sensitivities of the one stage planetary gear were investigated by some researchers. In this paper, parameters under consideration mainly include mesh stiffnesses. Using the well-defined vibration mode properties of tuned two stage planetary gears, the eigensensitivities are calculated and expressed in simple, exact formulae. These formulae connect natural frequency sensitivity with the modal strain and provide efficient means to determine the sensitivity to all stiffness parameters by inspection of the modal energy distribution. Source


Li G.-X.,Harbin Institute of Technology | Zhao Y.-Q.,Harbin Institute of Technology | Chang S.,Harbin 703 Research Institute | Jiang L.-D.,Harbin 703 Research Institute
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2011

The study on dynamic governing equations of two stage planetary gear train used in ship with double helical tooth was not reported. In this paper, the lateral-torsional coupling dynamic computation model is built, and then considering the factors (such as meshing stiffness, synthetic meshing errors, damping). Based on the compressions of the elastic elements for the first stage and the second stage, the dynamic model of the sub-element is established, and then the integrated dynamic governing equations are achieved. Source


Li G.-X.,Harbin Institute of Technology | Zhao Y.-Q.,Harbin Institute of Technology | Chang S.,Harbin 703 Research Institute | Zhang X.,Harbin 703 Research Institute
Journal of Harbin Institute of Technology (New Series) | Year: 2011

A computational model of two stage double helical tooth planetary gear set is employed to built the lateral-torsional coupling dynamic governing equations. Base on the dynamic equation, the free vibration properties of the system with unequally spaced planets and stars are analyzed. The vibration modes are classified into three types: star mode, planet mode, and coupling mode. For each of the modes, the relation between inherent frequency and vibration amplitude is investigated in detail by the eigenvalue and mode characteristics. Source

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