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Li W.,Harbin Institute of Technology | Wang L.,Harbin Institute of Technology | Chang S.,China Shipbuilding Industry Corporation 703 Institute | Zhao X.,Harbin Institute of Technology
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2012

Based on an algorithm proposed by Chinmaya Kar and A. R. Mohantya, which had computational condition for computation of time-varying contact line, this paper deduces a general formula based on the theory of engagement, which breaks the restrictions of the mating surface shape and the number of contact lines in engagement in the computation of the contact line. The given algorithm in this paper expands the application range of the numerical calculation of contact line, and controls the error within 5% comparing with the national standard value of computation. The research result provides a theoretical basis for design of gear parameters and the subsequent gear face friction. The given algorithm is used to compute the time-varying contact line of a helical gear within a transverse pitch by changing with different helix angles, and analyzing the changes law. The research results show, at the initial moment, there's no fluctuation of the whole contact line and the running is very stable when the length of L1 (the shortest distance from the top of contact line to the right end surface of the mating area at the initial moment of mating) is equal to a transverse pitch, and L2 (the shortest distance from the top of contact line to the left end surface of the mating area at the initial moment of mating) equals L4 (the shortest distance from the bottom of contact line to the right end surface of the mating area at the initial moment of mating). Source


Li W.-L.,Harbin Institute of Technology | Wang L.-Q.,Harbin Institute of Technology | Chang S.,China Shipbuilding Industry Corporation 703 Institute
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2013

Based on the calculation of time-varying contact line, the numerical algorithm is adopted to calculate the friction force of tooth surface and the friction torque with different helix angles. After analyzed Root Mean Square and fluctuation ratio of friction force of tooth surface and friction torque, the conclusions were obtained: the fluctuation ratio of time-varying contact line is the principal factor for the change of friction force of tooth surface and the friction torque. In the range of parameters selected, the fluctuations of tooth surface friction force and friction torque are the same as the volatility of time-varying contact line and show a change law between 10°-20° and 20°-30°, which provide a theoretical reference to reduce noise and vibration in engineering. Source


Wang J.-P.,Northwestern Polytechnical University | Chang S.,Northwestern Polytechnical University | Chang S.,China Shipbuilding Industry Corporation 703 Institute | Liu G.,Northwestern Polytechnical University | And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2016

A quick and exact method for finding the effective rib arrangement regions was proposed. Firstly the radiated noise of gearbox with a double helical gear system was calculated using FEM/BEM. Then panels were divided based on the analysis of acoustic transfer vector and modal acoustic contribution. Panel acoustic contribution analysis was completed and regions having larger acoustic contributions were found. Finally, the structure of gearbox housing was improved and the effective rib arrangement regions were identified. The results showed that the analysis of acoustic transfer vector and modal acoustic contribution can provide basis for the definition of panels and make it more accurate. The regions having larger acoustic contributions can be found quickly and exactly, which can provide basis for the finding of effective rib arrangement regions. The radiated noise on the corresponding field point can be reduced by arranging ribs on these effective regions. © 2016, Editorial Office of Journal of Vibration and Shock. All right reserved. Source


Wang J.-P.,Northwestern Polytechnical University | Chang S.,Northwestern Polytechnical University | Chang S.,China Shipbuilding Industry Corporation 703 Institute | Liu G.,Northwestern Polytechnical University | And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015

Radiated noise of a gearbox with a double helical gear system was calculated using FEM/BEM and the influences of modal shapes on the radiated noise were analyzed. The modal participation factors and modal acoustic contributions of each mode were calculated and the mode having the maximum contribution to the radiated noise of the input and output field points was found. The reasonable arrangements of ribs and isolation masses were proposed according to the analysis of modal acoustic contributions. The results showed that the flexural vibration of the gearbox housing has most obvious effects on the radiated noise; when the mode having the maximum acoustic contributions is determined, the positions on each panel having obvious flexural vibrations can be added with ribs or isolation masses, the radiated noise of field points at the same side of panels can be reduced obviously. ©, 2015, Chinese Vibration Engineering Society. All right reserved. Source


Li W.-L.,Harbin Institute of Technology | Li W.-L.,China Shipbuilding Industry Corporation 703 Institute | Wang L.-Q.,Harbin Institute of Technology | Chang S.,China Shipbuilding Industry Corporation 703 Institute | Dai G.-H.,China Shipbuilding Industry Corporation 703 Institute
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2013

Base on the theory of energy minimization the load distribution for helical gear was calculated. And the deformation on contact point was calculated in the case of considering the friction of the tooth surface. The comparison of calculated results shows that tooth friction has significant influence on the bending effect, and this influence will produce the vibration and noise. Finally, the dynamic functions were constructed to give the tooth friction and calculate the vibration trajectory of pinion and gear. Source

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