Abstract
High-power gears are widely used in various engineering fields. The gear transmission system is an extremely complex elastic system, which produces complex vibration under internal and external excitation. For the vibration and noise problems caused by transmission error, a discrete element and finite coupling method based on the particle filling rate is proposed. Firstly, the gear dynamic model was established, and the particle damper was installed in the gear to reduce the vibration of the gear. Secondly, through the coupling process, the contact force and contact position between the noncontinuous medium and the continuous medium were correctly transferred to the corresponding nodes of the finite element analysis model. Then, the equivalent displacement mapping of the contact loads’ node of the gear was realized, and the transformation of the local coordinate to the global coordinate was carried out. Finally, by combining theoretical analysis with experimental verification, the influence of the filling rate of damping particles on the vibration reduction effect of the gearbox under different working conditions was studied. The 2 mm tungsten particles were selected, and the particle damper had the best damping effect when the filling rate was 88%.
Highlights
A gear system is an important part of power transmission and motion in mechanical devices
Transmission error is the cause of vibration and noise [6, 7]. e excitation of gear transmission includes the external excitation caused by the prime mover and load as well as the internal excitation caused by time-varying meshing stiffness, time-varying transmission error, and meshing impact [8]
In this study, based on particle damping, a gear dynamic model was established by the coupling discrete element and finite element method. e vibration of the gear was reduced by installing the particle damper in the gear
Summary
A gear system is an important part of power transmission and motion in mechanical devices. In order to solve the vibration problem caused by exciting force, particle damping technology is introduced into the gear transmission system. Particle dampers are installed in the lightening holes to achieve energy dissipation through inelastic collisions and friction between particles and wall of the damper [11, 12] It can greatly improve the efficiency of vibration reduction. In order to meet the needs of future product development, it is necessary to develop and design a new vibration reduction technology without interrupting heat transfer path It is suitable for wide temperature range and wide frequency bandwidth and can avoid introducing linear displacement and angular displacement. Particle damping technology can provide effective broadband vibration reduction in harsh environments such as high and low temperature. The nonlinear dynamic characteristics of gear transmission with particle damping can be calculated and predicted more reasonably
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