This content is not included in your SAE MOBILUS subscription, or you are not logged in.
An Acoustic Target Setting and Cascading Method for Vehicle Trim Part Design
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 05, 2019 by SAE International in United States
Annotation ability available
One of the major concerns in the vehicle trim part design is the acoustic targets, which are generally defined by absorption area or coefficients, and sound transmission loss (STL) or sound insertion loss (SIL). The breaking down of acoustic targets in vehicle design, which is generally referred to as cascading, is the process of determining the trim part acoustic targets so as to satisfy full vehicle acoustic performance. In many cases, these targets are determined by experience or by subjective evaluation. Simulation based transfer path analysis (TPA), which traces the energy flow from source, through a set of paths to a given receiver, provides a systematic solution of this problem. Guided by TPA, this paper proposes a component level target setting approach that is based on the statistical energy analysis (SEA), an efficient method for vehicle NVH analysis in mid and high frequencies. Using a validated SEA model of the vehicle under consideration, the contributions of common noise sources and paths, which are generally defined on parts of sheet-metal with trim parts attached, can be evaluated. This allows the prediction of interior noise level due to various possible sound packages. On the base of this, acoustic target setting of trim parts can be defined as the solution of a mathematical optimization problem. The targets such as SIL of trim parts at certain frequency range are taken as design variables, and the vehicle level performance like the sound pressure level (SPL) at driver’s ear is incorporated into constraint functions. This approach is versatile and is suitable for traditional ICE vehicles and modern EVs. It can be used on a vehicle prototype at the early stages for target cascading, or on an existing vehicle model for NVH improvement. Several cases and examples on this target setting method have been discussed in the paper.
CitationWu, W., Ding, P., Zi, X., and Liu, B., "An Acoustic Target Setting and Cascading Method for Vehicle Trim Part Design," SAE Technical Paper 2019-01-1581, 2019, https://doi.org/10.4271/2019-01-1581.
- van der Seijsa M.V. , de Klerkab D. , and Rixen D.J. General Framework for Transfer Path Analysis: History, Theory and Classification of Techniques Mechanical Systems and Signal Processing 68-69 2016 217 244 10.1016/j.ymssp.2015.08.004
- Van der Auweraer , H. , Mas , P. , Dom , S. , Vecchio , A. et al. Transfer Path Analysis in the Critical Path of Vehicle Refinement: The Role of Fast, Hybrid and Operational Path Analysis SAE Technical Paper 2007-01-2352 2007 10.4271/2007-01-2352
- Kim , S.J. and Lee , S.K. Prediction of Interior Noise by Excitation Force of the Powertrain Based on Hybrid Transfer Path Analysis Int. J Automot. Technol. 9 577 2008 /10.1007/s12239-008-0068-8
- Le Bot , A. Foundation of Statistical Energy Analysis in Vibroacoustics UK Oxford University Press 2015
- Lyon , R.H. and Dejong , R.G. Theory and Application of Statistical Energy Analysis Second Boston Butterworth-Heinemann 1995
- Bocksch , R. , Schneider , G. , Moore , J. , and Ver , I. Empirical Noise Model for Power Train Noise in a Passenger Vehicle SAE Technical Paper 1999-01-1757 1999 10.4271/1999-01-1757
- VA One Software, ESI-Group 2017