Analytic Method on Vibrate Induced Noise of Engine Block

Abstract:

Numerical prediction of the acoustic radiation of vibrating engine block is conventionally based on the boundary element method (BEM). This approach yields good predictions, provided that the dynamic behavior of engine block is well established. However, interior resonances may lead to singular matrices and nonunique solution. To avoid the problems with interior resonances and singular matrices, this paper introduced the combined Helmholtz integral equation formulation method (CHIEF METHOD). The numerical experiment shows the performance of CHIEF METHOD and then we use this method to estimate the acoustic radiation of engine block. Based on spatially mean square velocity and acoustic radiation efficiency of vibrating engine block, a simplified analytic method is presented in this paper, by which the vibrate induced noise can be predicted in the early design process of engine development.

• Periodical: Advanced Materials Research (Volumes 308-310)
• Pages: 21-26
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.308-310.21
• Online since: August 2011
• Authors: Guang Ze Zheng, Kazuhide Ohta
• Keywords: Acoustic Radiation Efficiency, Acoustic Radiation Power, Chief Method, Engine Block, Mean Square Velocity

References

[1] Dixon, J.: Basic Parameters Effecting Petrol Engine Noise, Notes and Overheads from an oral presentation to ATA, November, 1992.

[2] Stout, J. L.: Concept Level Powertrain Radiated Noise Analysis, SEA 1999-01-1746.

[3] Richardson, S. H. and Riding, D. H.: Predictive Design Support in the Achievement of Refined Power for the Jaguar XK8, SEA 1997-20-41.

DOI: 10.4271/972041

[4] Loibnegger, B., Rainer, G. Ph., Bernard, L., Micelli, D. and Turino, G.: An Integrated Numerical Tool for Engine Noise and Vibration Simulation, SEA 1997-19-92.

DOI: 10.4271/971992

[5] Wu, T.W. Boundary Element Acoustics, WIT Press, Southampton, Boston (2002) .

[6] A. F. Seybert, B. Soenarko, F. J. Rizzo and D. J. Shippy: An Advanced Computational method for Radiation and Scattering of Acoustic Waves in Three Dimensions, Journal of the Acoustical Society of America, 77,362-368 (1985) .

DOI: 10.1121/1.391908

[7] H. A. Schenck: Improved Integral Formulation for Acoustic Radiation Problems, Journal of the Acoustical Society of America, 44, 41-58 (1968).

DOI: 10.1121/1.1911085

[8] Kazuhe Ohta et al: Analysis of vibratory Response and Noise Radiation of Engine Block Coupled with the Rotating Crankshaft and Gear Train System, 14th International Congress of Sound and Vibratioin, CdD-ROM paper No. 68, Caims, (2007).

[9] Guangze Zheng and Kazuhide Ohta: Dynamic Analysis of Piston Slap Coupled with Connecting rod, Crankshaft and Engine block, Transactions of the Japan Society of Mechanical Engineers, Series (C), Vol. 76, No.770, (2010).

DOI: 10.1299/kikaic.76.2560