Reduction of Structure-Borne Noise by Simulation
The main targets in the development of transmissions are increasing driving performance, efficiency and driving comfort. An important aspect in this context is decreasing transmission noise. The most significant transmission noise is whining. It is caused by mesh contact noise of gear pairs under load. The excitations caused by the tooth contact are transferred to the gearbox housing by gearwheel bodies, shafts and bearings. Here from they are either transmitted to the attached parts (by structure-borne noise) or emitted to the environment as air-borne noise. In this paper an approach for the simulation of the noise behaviour of a transmission will be presented. To compute the level of structure-borne noise on the surface of the gearbox housing, a simulation model was built in a multi-body simulation environment. The excitation phenomenon of whining as well as the propagation of the resulting structure-borne noise up to the surface of the housing is considered in this model. Therefore, shafts and housing are integrated in the multi-body simulation as flexible bodies. Additionally, an element to abate propagation of structure-borne noise is introduced. An effective way is to encapsulate the bearings. In this case a ring between the bearing outer ring and the housing is used. Different designs of the rings will be presented as well as their potential to reduce the transmission of structure-borne noise which is estimated in a finite element simulation. To validate the model, measurements of an experimental transmission are made. On a testing bench, a single-stage transmission is driven under specified load and speed. Accelerometers are installed at different positions on the housing and measured results are compared to the simulation results at these positions.
KeywordsTransmission noise Whining Structure-borne noise Gear mesh frequency Tooth contact
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