FVA 764 II – Validation VaMoS


Validation Gear Modelling for System Simulation (MBS)

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In the context of the continuously increasing demands on the acoustical characteristics summarized under the term NVH (Noise, Vibration, Harshness) and the comfort behavior, gearing excitations due to periodically changing meshing stiffnesses as well as shape deviations are one of the main sources of excitation. In the light of the ongoing electrification process in the mobility sector and consequently elimination of the associated combustion engine noise as a dominant noise source, transmission (gearing) noise is coming more into focus as it is considered particularly unpleasant by the driver due to its tonal and/or rattling noise characteristics. In order to identify possible anomalies in NVH behavior at an early stage of the development process and to derive optimization measures, elastic multi-body simulation (EMBS) methods have become established in day-to-day development work. Especially in the higher frequency range, which is dominated by gearing excitations, it is necessary to apply the forces of the gear excitations in the EMBS in the correct location. Therefore, a methodology has been developed within the research project FVA 764 I, which allows to model the gear excitations in the EMBS in a computationally efficient and accurate way on the basis of a preliminary calculation of stiffness characteristic maps. In this regard, a verification against commercially available EMBS methods has been carried out. Especially in the dynamic behavior deviations concerning the nonlinear dependence of the resonance frequencies of the system on the transmitted torques have been found. This project serves to validate the quasi-static and structural dynamic behavior of the developed module.

Research objectives

The aim of the project is to validate the methodology developed in project FVA 764 I by comparing the experimentally determined quasi-static and dynamic excitation behavior of test gears with the numerically determined gear excitations on the basis of the methodology presented in project FVA 764 I. The results of this validation will be used as a basis for the development of the test gears. For this purpose, test gears with different gear body geometries are designed and manufactured. The test gears are examined with respect to their quasi-static and dynamic behavior and compared with the methods of the state of the art and the tool chain developed in FVA764 I.

Research and project partners

  • RWTH Aachen University, WZL
  • Forschungsvereinigung Antriebstechnik (FVA)
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Funded by

Federal Ministry for Economic Affairs and Climate Action

Project executing agency

Forschungsvereinigung Antriebstechnik (FVA)