Numerical and experimental analysis of the vibroacoustic behavior of an electric window-lift gear motor
- 90 Downloads
This paper focuses on the numerical analysis of the vibroacoustic behavior of an electric window-lift gear motor for automotive vehicle which consists of a DC motor and a worm gear. A dynamic modeling of the gear motor is proposed. The excitation sources correspond to radial electromagnetic forces applied to steel stator, electromagnetic input torque fluctuation, rotor mechanical imbalance, worm gear static transmission error and mesh stiffness fluctuations and gear wheel eccentricity. Parametric equations of motion are solved using an iterative spectral method. It allows the computing of the vibroacoustic response of the system, taking account of the interaction between the mesh stiffness fluctuation and the other excitations. The simulation results are validated from comparison with experimental vibroacoustic measurements performed with a specific test bench. Spectrograms of the dynamic response show components corresponding to the harmonics of the excitation spectra, as well as lateral components arising around the mesh frequency and the input torque fluctuation frequency. This spectral enrichment is generated by the interaction between the mesh stiffness fluctuation and the other excitations. The lateral components contribute little to the overall level of the vibroacoustic response, but they may have a significant impact on the quality of noise radiated directly by the gear motor or indirectly by its supporting structure. Finally, the weights of the different excitation sources to the spatial-average mean-square velocity of the radiating surface and the equivalent global dynamic force transmitted to the supporting structure are compared.
KeywordsElectromagnetic force Mechanical imbalance Static transmission error Mesh stiffness fluctuation Eccentricity Dynamic transmitted force
The authors thank Inteva Products Company for financial and technical supports. The authors also thank the LabCom LADAGE (LAboratoire de Dynamique des engrenAGEs), created by the LTDS and the Vibratec Company and sponsored by the “Agence Nationale de la Recherche” in the Program ANR-14-LAB6-0003.
- 2.Robinson, I., Walsh, S., Stimpson, G.: Vehicle accessory tonal noise: experimental determination and subjective assessment. In: Proceedings of InterNoise 98, Christchurch, pp. 1049–1052 (1998)Google Scholar
- 3.Revel, G., Santolin, C., Tomasini, E.: Laser-Doppler vibration and acoustic intensity measurements for dynamic characterization and noise reduction of a car window lift system. In: Proceedings of 15th International Modal Analysis Conference, Orlando, pp. 1636–1642 (1997)Google Scholar
- 6.Hallal, J., Druesne, F., Lanfranchi, V.: Study of electromagnetic forces computation methods for machine vibration estimation. In: Proceedings of VI International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, Ohrid, 6 p (2013)Google Scholar
- 9.Welbourn, D.: Fundamental knowledge of gear noise: a survey. In: Proceedings of the Conference on Noise and Vibrations of Engines and Transmissions, Cranfield, Paper C177/79, pp. 9–14 (1979)Google Scholar
- 16.Rigaud, E., Barday D.: Modelling and analysis of static transmission error. Effect of wheel body deformation and interactions between adjacent loaded teeth. In: Proceedings of the 4th World Congress on Gearing and Power Transmission, Paris, pp. 1961–1972 (1999)Google Scholar
- 18.Jbily, D., Guingand, M., De Vaujany, J.P.: Loaded behaviour of steel/bronze worm gear. In: Proceedings of the International Gear Conference, Lyon, pp. 32–42 (2014)Google Scholar
- 19.Carbonelli, A., Rigaud, E., Perret-Liaudet, J.: Vibro-acoustic analysis of geared systems—predicting and controlling the whining noise. In: Fuchs, A., Nijman, E., Priebsch, H.H. (eds.) Automotive NVH Technology, Briefs in Applied Sciences and Technology, pp. 63–79. Springer, Berlin (2016)CrossRefGoogle Scholar
- 23.Rigaud, E., Sabot, J.: Effect of elasticity of shafts, bearings, casing and couplings on the critical rotational speeds of a gearbox. VDI Berichte 1230, 833–845 (1996)Google Scholar
- 24.Fahy, F., Gardonio, P.: Sound and Structural Vibration, 2nd edn. Elsevier, Amsterdam (2007)Google Scholar
- 25.Diop, S.: Analyse du comportement vibroacoustique et tribologique d’un motoréducteur de lève-vitre automobile (Analysis of the vibroacoustic and tribological behaviour of an automotive window-lift gearmotor) (in French). Ph.D. Thesis, Ecole Centrale de Lyon, France (2017)Google Scholar