Increasing requirements on the acoustic comfort and vibration levels demand the prevention of noise and vibration caused by vehicle-auxiliaries. To improve the dynamic and acoustic behavior validated FEA models with high prediction accuracy are essential. In this paper a method is described that explains how eigenfrequency and response simulations of AC blowers considering gyroscopic influences are validated by modal analysis and run-up tests. The nonlinear behavior of a standardized decoupling concept of blower and motor vibrations is analyzed. The validation is performed by creation of an analogous model (spring elements) followed by an optimization process (optimization of spring stiffness). Finally a topology optimization process is set up in order to optimize the decoupling element shapes of a similar decoupling configuration. The investigations showed that the validation of decoupling concepts with separate decoupling elements is highly impeded by non-linear effects such as micro friction or lift off. A method was developed in order to achieve a higher correlation with fast and simple methods. An analogous model with spring elements was created whereby the stiffness was optimised in the sense of higher conformance to test results. The optimised FE model was consequently used for run up simulations. The run up diagrams displayed the evidence of the previous optimisation process. Both the resonances and the acceleration amplitudes were matched by FEA. Future challenges include the conversion of optimised spring stiffness into a new decoupling element geometry.
Validation of vibration analysis of automotive air conditioning blowers
2008
18 Seiten, 25 Bilder, 9 Quellen
Conference paper
English
Virtual vibration analysis of automotive air conditioning units with rotating blowers
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