This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Verification of Numerical Acoustic Radiation Predictions
Annotation ability available
Sector:
Language:
English
Abstract
An experimental verification study was done of the numerical predictions of sound radiation from an automotive valve cover. The valve cover was mounted on the floor of a semi-anechoic chamber with a mechanical shaker attached to the inside of the cover. Transfer functions between the excitation force and the surface motion of the cover surfaces and the radiated sound pressure were measured. The surface motion of the valve cover was input to a numerical radiation prediction program which was used to predict the acoustic radiation using both the Helmholtz integral equation and the Rayleigh integral equation. The predicted and measured sound pressure levels were compared at 25 field points. The verification study showed that the Helmholtz integral equation prediction is good at all locations for this frequency band. The Rayleigh integral equation predictions were reasonable at some frequencies at some points but are not good in general.
Authors
Topic
Citation
Smith, D. and Bernhard, R., "Verification of Numerical Acoustic Radiation Predictions," SAE Technical Paper 891171, 1989, https://doi.org/10.4271/891171.Also In
References
- Copley L. G. “Integral Equation Method for Radiation from Vibrating Bodies,” Journal of the Acoustical Society of America 41 4 1967 807 816
- Schenck H. A. “Improved Integral Formulation for Acoustic Radiation Problems,” Journal of the Acoustical Society of America 44 1 1968 41 58
- Meyer W. L. Bell W. A. Zinn B. T. “Boundary Integral Solutions of Three Dimensional Acoustic Radiation Problems,” Journal of Sound and Vibration 59 2 1978 245 262
- Bernhard R. J. Gardner B. K. Smith D. C. “Alternative Methods for Computing Sound Radiation from Vibrating Surfaces,” Proceedings of 5th IMAC 1 343 349
- Hayes P. A. Quantz C. A. “Determining Vibration Radiation Efficiency, and Noise Characteristics of Structural Designs Using Analytical Techniques,” SAE Paper No. 820440 , SAE Conference Feb 1982
- Seybert A. F. Soenarko B. Rizzo F. J. Shippy D. J. “Application of the BIE Method to Sound Radiation Problems Using An Isoparametric Element,” ASME paper no. 82-WA/NCA-l 1982
- Benner H. Koopmann G. H. “Sound Power Prediction Using the Helmholtz-Kirchhoff Integral Equation,” ASME Paper No. 81- WA/NCA-4 1981
- Francis D. T. I. Sadek M. M. Tobias S. A. “Prediction of Acoustic Emission of Impact Forming Machines from Design Drawing,” ASME Paper No. 81-WA/NCA-5 1981
- Vajpayee S. Nigm M. M. Sadek M. M. “Acoustic Diagnosis of a Hydraulic Hammer,” ASME Paper No. 81-WA/NCA-8 1981
- Pierce A. D. Acoustics: An Introduction To Its Physical Principles and Applications McGraw-Hill New York 1981
- Burton A. J. Miller G. F. “The application of integral equation methods to the numerical solution of some exterior boundary-value problems,” Proc. Roy. Soc. Lond 1971 201 210
- Rayleigh J. S. The Theory of Sound Lindsay R. B. Dover 1945
- Schroeder M. R. “Synthesis of Low Peak-Factor Signals and Binary Sequences of Low-Correlation,” IEEE Trans. on Info. Theory Jan 1970 85 89
- Flower J. O. Knott G. F. Forge S. C. “Application of Schroeder-Phased Harmonic Signals to Practical Identification,” Measurement and Control II Feb. 1978 69 73
- Seybert A. F. Rengarajan T. K. “The Use Of CHIEF To Obtain Unique Solutions For Acoustic Radiation Using The Boundary Integral Equations,” Journal of the Acoustical Society of America 81 5 1987 1299 1306