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Transfer Path Analysis - Experiences, Expectations and Perspectives
Technical Paper
2014-36-0803
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The concept of identifying, characterizing and assessing sound transfer paths from sources to receiving points by applying transfer path analysis (TPA) has been keeping continuous interest since its introduction some 25 years ago. The attractive prospects of TPA-based clues to aimed modifications at particular sound sources and/or sound transmission paths have been confirmed by many successful applications of the approach. Nevertheless, the method still lacks full, undisputed acknowledgement and approval as a widespread tool of sound contribution analysis.
Apart from unrealistic early expectations this may be due to considerable measuring efforts to sufficiently describe all relevant sources. For this reason, the instrumental realization of the approach has been subject to continuous modifications to tighten up the procedure and to reduce its measuring and evaluating efforts.
Based on a review of the most relevant implementations of the TPA approach, the paper will compare the related benefits and drawbacks with respect to typical applications. Reducing the measuring effort typically limits insight to source mechanisms, thus limiting the predictive accuracy for source and transmission path modifications. However, the high performance in analyzing excitation and transmission of sound and vibration by handsome procedures makes this approach a most attractive and valuable tool for the NVH engineer.
This will be illustrated in particular for operational transfer path analysis where manageable efforts are obtained by registering truly operational data only. If evaluated properly, these data allow for valuable and targeting sound contribution analysis without tedious single measurements. Illustrated by examples from practical evaluations, the paper will review this methodology together with recent extensions like sensitivity analysis and thus outline realistic perspectives of TPA as an indispensable tool of demanding NVH engineering.
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Authors
Citation
Scheuren, J. and Lohrmann, M., "Transfer Path Analysis - Experiences, Expectations and Perspectives," SAE Technical Paper 2014-36-0803, 2014, https://doi.org/10.4271/2014-36-0803.Also In
References
- De Klerk , D. and Ossipov , A. Operational transfer path analysis: theory, guidelines and tire noise application Mechanical Systems and Signal Processing 24 2010 1950 1962
- Bendat , J.S. System identification from multiple input/output data Journal of Sound and Vibration 49 3 293 308 1976
- Bendat , J.S. and Piersol , A.G. Random data - analysis and measurement procedures 2 nd Wiley and sons New York 1986
- Noumura , K. and Yoshida , J. Method of transfer path analysis for vehicle interior sound with no excitation experiment Proc. FISITA 2006, paper F2006D183 Yokohama 2006
- Lohrmann , M. Operational transfer path analysis: comparison with conventional methods Proc. ICSV 15, paper T0768 2671 2676 Daejeon, Korea 2008
- Noumura , K. Personal communication
- Putner , J et al. Operational transfer path analysis predicting contributions to the vehicle interior noise for different excitations from the same sound source Proc. Inter-Noise 2012, paper in12 389 New York 2012
- Putner , J. , Lohrmann , M. and Fastl , H. Contribution analysis of vehicle exterior noise with operational transfer path analysis Proc. Meetings on Acoustics, vol.19, 040035 (ICA 2013) Montreal 2013
- Putner , J. , Lohrmann , M. and Fastl , H. Analysis of the contributions from vehicle cabin surfaces to the interior noise Proc. Inter-Noise 2013, paper 0741 Innsbruck, Austria 2013
- Plunt , J. Operational transfer path analysis (OTPA). Can this novel technology be applied successfully outside the automotive sector? BNAM 2010 Bergen, Norway 2010