Simulation Analysis of an Ambulance Carriage Interior Noise

Abstract:

Based on the theory of multi-body system dynamics, the analytical method of finite element and boundary element, the finite element model of vehicle body, the rigid-flexible coupled model of vehicle and the acoustic boundary element model of carriage were established by applying a variety of simulation software. Road roughness was simulated and the SPL of field point in carriage under the excitation was computed at the frequency range of 20-150Hz. Considering the size and the positive /negative nature of panels acoustic contribution at SPL peak of field point, damping treatments were taken on different combinations of panels to decrease multiple field points SPL peak and the optimal treatment was finally confirmed. The results showed that noise reduction measures can generally decrease the SPL peak around the crew.

• Periodical: Applied Mechanics and Materials (Volume 535)
• Pages: 581-585
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.535.581
• Online since: February 2014
• Authors: Shi Ke Hou, Song Bai, Hao Jun Fan*, Hui Ding, Yong Zhong Zhang, Bao Guo Yu
• Keywords: Noise Analysis, Noise Reduction with Damping, Panel Acoustic Contribution Analysis (PACA), Road Roughness

References

[1] Xu X X, Liu Y J, Wang T Y, et al. Interaction between compartment environment and human in the man-machine-environment system of mobile medical equipment[J]. Bulletin of the Academy of Military Medical Sciences, 2006, 30(4): 357-360.

[2] Chen X, Yuan X G. The Physiological basis of man-machine-environment system engineering[M]. Beijing: Beihang University Press, (2001).

[3] Han X., Yu H.D., Guo YJ., et al. Study on Automotive Interior Sound Field Refinement Based on Panel Acoustic Contribution Analysis[J]. Journal of Shanghai Jiaotong University, 2008, 42(8): 1254-1258.

[4] Kim K C, Kim C M. Process of designing body structures for the reduction of rear seat noise in passenger car [J]. International Journal of Automotive Technology, 2007, 8(1): 67-73.

[5] Ding W, Chen H. Research on the interior noise contributed from a local panel's vibration of an elastic thin-walled cavity [J]. Applied Acoustics, 2002, 63(1): 95-102.

DOI: 10.1016/s0003-682x(01)00016-0

[6] Wang M. Simulation analysis and optimization for vibration damping characteristics of stretchers on ambulance based on ADAMS[D]. Beijing: The Academy of Military Medical Sciences, (2009).

[7] Au F T K., Cheng Y S, Cheng Y K. Effects of random road Surface roughness and long-term defection of prestressed concrete girder and cable-stayed bridges on impact due to moving vehicles[J]. Computers and Structures, 2001, 79(8): 853-872.

DOI: 10.1016/s0045-7949(00)00180-2

[8] Zhang L J, He H, Wang Y S. Analysis on instantaneous spatial spectrum of vehicle response[J]. Journal of Vibration and Shock, 2003, 22(3): 16-20.

[9] Wang Y S, Li Z M, He H. Nonstationary road roughness simulation in time domain and wavelet analysis for four wheel vehicles[J]. Automotive Engineering, 2004, 26 (1): 42-47.

[10] Zhao H, Lu S F. A Vehicle' time domain model with road input on four wheels[J]. Automotive Engineering, 1999, 21(2): 112-117.