An Analytical Method for Acoustic Characterisation of EV Interior Trims
The growing concern for the environment and advancement in technology has led the automotive industries to develop green vehicles. The development of EV among alternative power-train has attained popularity. Replacing conventional power-train with an electric powertrain does not resolve the acoustic issues of vehicles. However, acoustic tests performed on EV shows that noise levels in the cabin are significant in high sensitivity region of human hearing. At present, limited research has been carried out in the acoustics of EV interiors due to the complexities involved in predicting noise level. This paper aims at developing an efficient method to optimize vehicle interior acoustics by characterizing interior trims. Alpha cabin and impedance tube experiments were conducted on porous materials to obtain acoustic and non-acoustic properties. The non-acoustic properties thus obtained were used as input parameters for a Statistical Energy Analysis (SEA) tool to obtain simulation results. Experiment and simulation results showed good correlation which would assist in creating a database of interior trims. The proposed method can therefore be used as an effective and efficient means to predict and optimize EV interior acoustic performance in the early design phase. The assistance of the developed analytical method in optimizing NVH performance has a significant impact on saving time and the cost of design.
KeywordsElectric Vehicle Sound Absorption Sound Absorption Coefficient Flow Resistivity Reverberation Time
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- 1.ASTM C423: Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room MethodGoogle Scholar
- 3.Cherng, J., Xi, Q., Mohanty, P., Ebbitt, G.: A comparative study on sound transmission loss and absorption coefficient of acoustical materials SAE Technical paper 2011-01-1625; doi:10.4271/2011-01-1625Google Scholar
- 4.Duval, A., Roundeau, F., Dejaeger, L., Sgard, F., Atalla, N.: Diffuse field absorption Coefficient simulation of porous materials in small reverberation rooms: finite size and Diffusivity issues. In: 0th French Congress on Acoustics, Lyon (2010)Google Scholar
- 5.Bertolini, C., Guj, L.: Numerical Simulation of the measurement of the diffuse field absorption coefficient in small reverberation rooms. SAE Technical paper 2011-01-1641; doi:10.4271/2011-01-1641Google Scholar
- 6.Lyon, R.H., Dejong, R.G.: The Theory and Application of Statistical Energy Analysis, 2nd edn. Butterworth-Heinemann (1995)Google Scholar
- 7.Saha, P., Pan, J., Veen, J.: Thoughts behind Developing SAE Standard J2883 - Random Incidence Sound Absorption Tests Using a Small Reverberation Room. SAE Technical Paper 2009-01-2141 (2009); doi: 10.4271/2009-01-2141Google Scholar