This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Examples of Using Transfer Path Analysis (TPA) together with CAE-Models to Diagnose and Find Solutions for NVH Problems Late in the Vehicle Development Process
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 16, 2005 by SAE International in United States
Annotation ability available
This paper discusses the use of experimental transfer path analysis (TPA) to find optimized solutions to NVH-problems remaining in late vehicle development stages. After a short review of the established TPA methods, a couple of practical cases are discussed to illustrate how TPA, FE-models and practical experiments can supplement each other efficiently for finding optimum and attribute-balanced solutions to remaining, complex NVH issues late in the development process.
The first example discusses an interesting idle noise and vibration problem for a front-wheel drive car with a pendulum engine suspension and torque rods attached to a resiliently mounted subframe. The second example illustrates the somewhat different approach used for TPA at mid- and high frequencies. The third example illustrates analysis “shortcuts” that sometimes can save precious calendar time close to SOP, provided that the simplifications are based on qualified, expert judgments. Finally, an example of a tricky, but not unusual transfer path separation situation, when attachments are in close proximity, is discussed and a pragmatic solution approach is proposed.
CitationPlunt, J., "Examples of Using Transfer Path Analysis (TPA) together with CAE-Models to Diagnose and Find Solutions for NVH Problems Late in the Vehicle Development Process," SAE Technical Paper 2005-01-2508, 2005, https://doi.org/10.4271/2005-01-2508.
- Wyckaert K., Van der Auweraer H.: Operational Analysis, Transfer Paths Analysis, Modal Analysis: Tools to Understand Road Noise Problems in Cars. Proc. SAE Noise and Vibration Conference. 1995, p 139-143.
- Transfer Path Analysis: The Qualification and Quantification of Vibro-Acoustic Transfer Paths. LMS International. Application Notes
- Plunt J: Strategy for transfer path analysis (TPA) applied to vibro-acoustic systems at medium and high frequencies. Proc. ISMA 23, 16-18 September, Leuven, Belgium.
- Plunt J., Kamph E. Fothergill D.: Dynamic Analysis and Acoustic Optimization of the Volvo Multi-Link Rear Suspension. Proc. SAE Noise and Vibration Conference. 1989, paper 891142.
- Schröder M. R.: Statistical parameters of the frequency response curves of large rooms. Journal of Audio Engineering Society, 35 (1987), pp 299-305. (Translated from German, orig. Acoustica 4 (1954), pp 594-600).
- Kompella M. S., Bernhard B. J.: Measurement of the statistical variation of structural-acoustic characteristics of automotive vehicles. Proc. SAE Noise and Vibr Conf. 1993, paper 931272.
- Plunt J.: Predictability limitations of vibration transfer functions for structures with overlapping modes. Proc. Conf. Spacecraft Structures, Materials & Mech Testing. Noordwiik, The Netherlands, 27-29 March 1996 (ESA SP-386, June 1996).
- ISO10846-1/2 1997. Acoustics and Vibration - Laboratory measurement of vibro-acoustic transfer properties of resilient elements. Part 1: Principles and guidelines. Part 2: Dynamic stiffness of elastic supports for translatory motion - Direct Method.
- Petersson B: Studies of ordinary and effective mobilities for the determination of structure-borne sound power transmission. Chalmers University of Technology, Dept of Applied Acoustics, Report F83-05, 1983