Abstract：Due to the special working conditions of the heavy duty marine gearbox, its performance requirements are far higher than the other gearbox. Structure and transmission principle of a heavy duty marine gearbox were analyzed. According to the basic principles and methods of experimental modal analysis, frequency response function was optimized by least square method，modal parameter of heavy duty marine gearbox was identified using single-mode identification method, and the top 20 rank natural frequency and damping ratio were obtained. Results showed that the rotational frequency and meshing frequency of marine gearbox system were away from natural frequency of gearbox. Resonance of the system would not occurred. However, considering complicated speed variation of the gearbox in the actual work, intense resonance of the system would occur when the speed reached the critical speed. Test results can provide an analysis basis for further study of dynamic characteristics.
2011, Vol. 30 
