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On the Effectiveness of the Spatial Transmissibility to Drive the NVH Design of Cylinder Head Covers
Technical Paper
2006-01-0280
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Many suppliers and OEMs adopted the concept of transmissibility ratio <TR> as a method of choice to evaluate the NVH performance of cylinder head cam covers. The <TR> was defined as the transfer function between the cam cover and the cylinder head average vibrations. The <TR> was shown to be independent of the engine speed and declared to be a characteristic intrinsic to the cam cover system.
This paper examines the correlation between the <TR> predictions and the measured cam covers sound power. For this purpose, a comprehensive study was conducted using several cam covers with different materials, designs and isolation systems. The results indicated a moderate correlation between the <TR> and the sound power for the isolated covers only. Analysis of the measured cam cover and cylinder head vibrations shows the potential cause for this weak correlation and demonstrates the need for improving the <TR> definition in order to accurately guide the cam cover NVH design.
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Authors
Citation
Zouani, A., "On the Effectiveness of the Spatial Transmissibility to Drive the NVH Design of Cylinder Head Covers," SAE Technical Paper 2006-01-0280, 2006, https://doi.org/10.4271/2006-01-0280.Also In
References
- Lu Y. C. Anderson M. E. “On the Use of Spatial Transmissibility to Evaluate the NVH Performance of Engine Covers” SAE Technical Paper Series, No. 2002-01-0458 2002
- Herrera E. “2004 Nissan 3.5L Cam Cover Material Study: Aluminum, Magnesium and Composite” SAE Technical Paper Series, No. 2005-01-0727 2005
- Thompson D. J. et al. “Assessment of the Noise Radiation from Engine Cover” SAE Technical Paper Series, No. 2002-01-00048 2002