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As a key component to adjust the speed and torque, double-fed speed up gearbox plays a vital role in reliability and stability for the wind turbine system. Considering the base helix angle, normal pressure angle, position angle, rotation of carrier and the mesh of the ring gear and planet gear, a coupled dynamic model for high-power wind turbine gearbox transmission system, which consists of two helical planetary stages and one helical gear stage was established using the lumped parameter method in this paper. Numerical integration applying the explicit 4/5th order Runge-Kutta algorithm was used to solve the proposed model and the dynamic responses of transmission system were investigated. Results show that the modal frequencies for the system are not coincided with the gear mesh frequencies of the stages. Then, the dynamic mesh forces of the 1 st stage in different models are compared and analyzed in frequency domain.

This paper deals with an optimal layout design of the constrained layer damping (CLD) treatment of vibrating structures subjected to stationary random excitation. The root mean square (RMS) of random response is defined as the objective function as it can be used to represent the vibration level in practice. To circumvent the computationally expensive sensitivity analysis, an efficient optimization procedure integrating the pseudoexcitation method (PEM) and the double complex modal superposition method is introduced into the dynamic topology optimization. The optimal layout of CLD treatment is obtained by using the method of moving asymptote (MMA). Numerical examples are given to demonstrate the validity of the proposed optimization procedure. The results show that the optimized CLD layouts can effectively reduce the vibration response of the structures subjected to stationary random excitation.

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