Structural vibration analysis and optimization of herringbone gear transmission system under multiple loads

In order to reducing the vibration of herringbone gear transmission system more effectively, the corresponding design methods were put forward respectively from the aspect of inhibiting vibration excitation sources from herringbone gear transmission system (tooth meshing quality) and vibration transmission path (box structure). The three-dimensional modification of teeth surfaces was made to optimally mitigate the vibration between the herringbone gear meshing teeth under multi-loads. The structural topology optimization was carried out aiming at improving the static (box deformation) and dynamic (lower natural frequency) characteristics of the gearbox structure, and the optimization results can indicate which parts of redundant material should be removed and which parts of structure need to be strengthened. Accordingly, the structural size of gear box was optimized to achieve minimum acceleration on gearbox feet. The calculations and experimental results of a practical example show that the method of three-dimensional tooth modification can reduce vibration by 18.9% in experimental test and by 20.5% in theoretical analysis and the method of gearbox structural optimization can reduce vibration by 12%. The better effect of 27.3% is achieved by the combination use of the two methods.