This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Estimation Of Damping Loss Factors By Using The Hilbert Transform And Exponential Average Method
Technical Paper
2001-01-1408
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The damping loss factor of a structural panel plays a significant role in its vibro-acoustic performance. The objective of this paper is to present a new procedure for evaluating the damping loss factors of these panels. Traditionally, the damping loss factors are determined by using the decay rate of the decay curves which are experimentally obtained from the structure. However, this is time consuming and the accuracy is limited by fluctuations in the decay curve. In this paper, the envelope signal of each decay curve is determined through its Hilbert transform, and the remaining small fluctuations in the envelope signal are further smoothed out by the exponential average method. Finally, the damping loss factor is estimated based on the smoothed envelope signal of each decay curve. A computer program has been developed to implement this procedure. It is shown that this procedure improves both accuracy and efficiency of the decay rate method for estimating damping loss factor.
Recommended Content
Citation
Liu, C. and Goetchius, G., "Estimation Of Damping Loss Factors By Using The Hilbert Transform And Exponential Average Method," SAE Technical Paper 2001-01-1408, 2001, https://doi.org/10.4271/2001-01-1408.Also In
SAE 2001 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V110-6; Published: 2002-09-15
Number: V110-6; Published: 2002-09-15
References
- Bendat Julius S. Piersol Allan G. RANDOM DATA Analysis and Measurement Procedures 2nd John Wiley & Sons New York 1986 484 514
- Lyon Richard H. DeJong Richard G. THEORY AND APPLICATION ON STATISTICAL ENERGY ANALYSIS 2nd Butterworth-Heinemann Boston 1995 155 157