Acoustic simulation of vehicle sound package components using SEA modelling is an efficient tool for predicting and optimising carpet acoustic performance against various design constraints. The SEA simulation provides sufficient spatial and frequency resolution range (315 Hz - 8 kHz) for the vehicle air-borne noise range and gives a reasonable agreement for comparative analysis of various sound package components. Defining the simulation process and setting the performance targets are keys for an efficient simulation based design. The simulation results of the vehicle carpet show that floor trims can contribute very much (12 dB range) in reducing engine noise, compared to tyre/road noise (4 dB range). The Taguchi analysis results also indicate that the vehicle carpet has the second dominating role in cabin noise reduction, both as a noise insulator and absorber. Both the thermogram and the section-wise carpet Taguchi analysis indicate that absorption or insulation of noise closer to the noise sources has better impact on improving noise reduction, than that in other areas. Based on vehicle CAD data inputs, this paper has described a detailed process of how to remodel and simplify a vehicle model in the SEA software using plate/shell functions, how to validate the vehicle simulation model using the measured acoustic transfer functions and how to identify the most sensitive floor carpet locations for noise reduction inside vehicle passenger compartment using Taguchi method. The following additional conclusions have been drawn: 1. The front passenger foot well area and the transmission tunnel area contribute most to the low-frequency engine noise reduction; a further treatment in these areas will effectively reduce the low-frequency engine noise. 2. The driver's foot well area and the front passenger foot well area contributes most to the high-frequency tyre-road noise reduction; a further treatment in these areas will effectively reduce the high-frequency tyre - road noise for the four wheel drive vehicle.
Vehicle floor carpet acoustic optimisation using statistical energy analysis
International Journal of Vehicle Noise and Vibration ; 5 , 1/2 ; 141-157
2009
17 Seiten, 13 Bilder, 2 Tabellen, 8 Quellen
Article (Journal)
English
Vehicle floor carpet acoustic optimisation using statistical energy analysis
Automotive engineering | 2009
|Vehicle floor carpet acoustic optimisation using statistical energy analysis
Online Contents | 2009
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