This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Low-Frequency Noise Transfer Path Identification Study for Engine Sub-Frame Utilizing Numerical Simulation
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 15, 2015 by SAE International in United States
Annotation ability available
Nowadays, by the introduction of significant advances in automotive industries, noise, vibration and harshness (NVH), in the position of the main comfort attribute, plays a crucial role in marketing and passenger satisfaction. In order to cope NVH problems, three main actions are taken by NVH engineers for reducing perceived level of noise in cabin: Noise reduction in sources, Noise path treatment and Noise control at receiver. Among these approaches, those pertain to modification of noise pass, through structure and air, to the cabin are more prevalent in automotive applications. Accordingly, identification of noise paths that dominantly contribute to sound and vibration transfer to cabin phenomenon should be dealt with importance. In practice, engine vibration transmitted through sub-frame attachments to body can induce high level of noise and vibration to the passenger cabin. In this research, at first stage, optimization of shell thicknesses for four main engine sub-frame components is performed to minimize noise transfer function at driver's ear positions. Taguchi methodology is chosen for this matter as a robust method which reduces number of simulations significantly. Then, transfer path identification is performed for the optimized engine sub-frame configuration with six attachment mounts to the body structure. For this aim, numerical simulation is utilized for virtual analyses. Finite element method is used to simulate cabin vibro-acoustic behavior of a B-segment sedan car exited by engine vibration. Resultantly, contribution of each attachment point in the transferred noise to driver's ear is identified through calculating sound pressure level at critical frequencies in the designated points of cabin cavity.
|Journal Article||Evaluation of Trim Absorption to Exterior Dynamic and Acoustic Excitations Using a Hybrid Physical-Modal Approach|
|Technical Paper||PASSENGER CAR NOISE - ENGINE HARSHNESS|
CitationBeigmoradi, S., "Low-Frequency Noise Transfer Path Identification Study for Engine Sub-Frame Utilizing Numerical Simulation," SAE Technical Paper 2015-01-2361, 2015, https://doi.org/10.4271/2015-01-2361.
- Biermayer , W. , Brandl , F. Hoeldrich , R. , Sontacci , A. , Brandl , S. and Fliesser W. Sound Engineering based on Source Contributions and Transfer Path Results JSAE Annual Congress 2007
- Cameron , C. J. , Wennhage , P. and Göransson , P. Prediction of NVH Behaviour of Trimmed Body Components in the Frequency Range 100-500 Hz Applied Acoustics J. 71 8 708 721 2010
- Keshavarz , A. , Bayani Khaknejad , M. , Beigmoradi , S. , and Jahani , K. Refinement of Powertrain Transmitted Vibration by Optimizing the Geometrical Parameters of Vehicle Body Structure SAE Technical Paper 2013-01-1715 2013 10.4271/2013-01-1715
- Dong-Chan , L. A Design of Panel Structure for the Improvement of Dynamic Stiffness Proc. IMechE, Part D: J. Automobile Engineering 218 647 654 2004
- Jahani , K. , Beigmoradi , S. , Ramezani , A. and Hajabdollahi , H. Panel Contribution Analysis for a Sedan Car Using Numerical Simulations 20th Int. Congress on Sound and Vibration (ICSV20) Bangkok, Thailand 2013
- Paz , M. Structural Dynamics: Theory and Computation Van Nostrand Reinhold 1 New York 1985
- Wang , X. Vehicle Noise and Vibration Refinement Woodhead Publishing Limited UK 2010
- Montgomery , D. C. Design and analysis of experiments 7 th Wiley 2008