Interior sound field refinement of a passenger car using modified panel acoustic contribution analysis

2009 ◽  
Vol 10 (1) ◽  
pp. 79-85 ◽  
Author(s):  
X. Han ◽  
Y. -J. Guo ◽  
H. -D. Yu ◽  
P. Zhu
Keyword(s):  
Sound Field ◽  
Passenger Car ◽  
Contribution Analysis ◽  
Acoustic Contribution

Sound Source Identification and Acoustic Contribution Analysis Using Nearfield Acoustic Holography

2014 ◽  
Vol 945-949 ◽  
pp. 717-724 ◽  
Author(s):  
Jiang Hua Deng ◽  
Jun Hong Dong ◽  
Guang De Meng
Keyword(s):  
Source Identification ◽  
Noise Source ◽  
Near Field ◽  
Superposition Principle ◽  
Sound Field ◽  
Mirror Image ◽  
Sound Sources ◽  
Incoming Wave ◽  
Reflected Waves ◽  
Acoustic Contribution

The main goal of the present paper is to provide a method of source identification. Firstly, statistically optimal near-field acoustical holography (SONAH) techniques are applied to locate sound sources with the reflected sound field. In the presence of reflection plane parallel and perpendicular to the source plane, the incoming wave and reflected waves are separated based on the acoustic superposition principle and acoustic mirror image principle to satisfy the condition of the sound sources reconstruction using SONAH. Secondly, contribution of noise source to the special field point is analyzed and noise source ranking of interior panel groups are evaluated based the proposed three step acoustic contribution method. Finally, this method is verified experimentally.

Topology Optimization of Gearbox to Reduce Radiated Noise

2015 ◽  
Author(s):  
J. P. Wang ◽  
G. Liu ◽  
S. Chang ◽  
L. Y. Wu
Keyword(s):  
Topology Optimization ◽  
Sound Pressure Level ◽  
Sound Pressure ◽  
Pressure Level ◽  
Dynamic Loads ◽  
Field Point ◽  
Radiated Noise ◽  
Contribution Analysis ◽  
Acoustic Contribution ◽  
Mode Order

In this paper, topology optimization of gearbox to reduce the radiated noise is studied based on the analysis of modal acoustic contribution and panel acoustic contribution. Firstly, the bearing dynamic loads are obtained by solving the dynamic equations of gear system. Secondly, the vibration of gearbox is calculated using FEM and the radiated noise is simulated using BEM by taking these bearing dynamic loads as excitations. Thirdly, the panel having larger contribution to the sound pressure level (SPL) at a specific field point is found by panel acoustic contribution analysis (PACA), and this panel is taken as design domain. The mode order with larger contribution is determined by modal acoustic contribution analysis (MACA), and making corresponding natural frequency becomes far away from excited frequency is taken as a constraint. Finally, the topology optimization of gearbox is completed using SIMP method, and the ribs are arranged according to the optimization results. The results show that the equivalent sound pressure level at objective field point can be reduced obviously by using this method.

Panel Contribution Analysis Based on FEM, BEM and Numerical Green’s Function Approaches

2018 ◽  
Vol 26 (03) ◽  
pp. 1850037
Author(s):  
Kirill Shaposhnikov ◽  
Mads J. Herring Jensen
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Noise Level ◽  
Acoustic Pressure ◽  
Boundary Element Methods ◽  
Numerical Techniques ◽  
Structural Vibrations ◽  
Contribution Analysis ◽  
Pros And Cons ◽  
Acoustic Contribution

The panel acoustic contribution analysis is used to determine the contribution of vibrating panels to the noise level inside closed spaces like a car cabin. The use of numerical techniques makes it possible to rate the panels according to their contributions accounting for the interaction between the structural vibrations and the acoustic pressure at a listening point. We consider the application of the finite and boundary element methods and the numerical Green’s function approaches to the problem and discuss the pros and cons regarding their use. The results show that the numerical Green’s function approach coupled to structure can be effectively used for the panel contribution analysis in situations with multiple panels and few listening points.

Vehicle Noise and Weight Reduction Using Panel Acoustic Contribution Analysis

1995 ◽  
Author(s):  
Y. Kevin Zhang ◽  
Ming-Ran Lee ◽  
Paul J. Stanecki ◽  
Gordon M. Brown ◽  
Tom E. Allen ◽  
...  
Keyword(s):  
Weight Reduction ◽  
Vehicle Noise ◽  
Contribution Analysis ◽  
Acoustic Contribution

scholarly journals Optimization of Noise Transfer Path Based on the Composite Panel Acoustic and Modal Contribution Analysis

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Qiang Liu ◽  
Xuanyi Zhou ◽  
Jianxin Zhu ◽  
Xiaoping Gong
Keyword(s):  
Path Optimization ◽  
Composite Panel ◽  
Vehicle Body ◽  
Acoustic Model ◽  
Transfer Vector ◽  
Field Point ◽  
Transmission Path ◽  
Transfer Path ◽  
Contribution Analysis ◽  
Acoustic Contribution

The noise of a cab directly affects the comfort and labor efficiency of the operators. The optimization of the structure-borne transmission path can obviously reduce the cab noise. The method of panel acoustic contribution analysis (PACA) is used to reduce structure noise. However, most studies only consider the panel acoustic contribution of a single frequency, without considering the contribution of major frequencies synthesis to confirm the optimized panels. In this paper, a novel method is proposed based on composite panel acoustic and modal contribution analysis and noise transfer path optimization in a vibro-acoustic model. First, the finite element model (FEM) and the acoustic model are established. Based on the acoustic transfer vector (ATV) method, a composite panel acoustic contribution analysis method is proposed to identify the panels affecting the noise of the field point. Combined with the modal acoustic contribution of the modal acoustic transfer vector (MATV) method, the noise field point is confirmed in the area which has the most significant influence. Second, the optimization algorithm NLOPT which is a nonlinear optimization is applied to design the areas. The noise transfer path optimization with vibroacoustic coupling response can quickly determine the optimal thickness of the panels and reduce low-frequency noise. The effectiveness of the proposed method is applied and verified in an excavator cab. The sound pressure level (SPL) the driver’s right ear (DRE) decreased obviously. The acoustic analysis of the composite panel acoustic contribution and modal acoustic contribution can more accurately recognize an optimized area than the traditional PACA. This method can be applied in the optimization of the structure-borne transmission path for construction machinery cab and vehicle body.

Panel acoustic contribution analysis

2013 ◽  
Vol 133 (2) ◽  
pp. 799-809 ◽  
Author(s):  
Sean F. Wu ◽  
Logesh Kumar Natarajan
Keyword(s):  
Contribution Analysis ◽  
Acoustic Contribution

Research on Speech Intelligibility of Sound Field inside Passenger Car

2011 ◽  
Vol 403-408 ◽  
pp. 5214-5219
Author(s):  
Deng Feng Wang ◽  
Gang Ping Tan ◽  
Shu Ming Chen ◽  
Ji Guang Jiang ◽  
Li Li Su
Keyword(s):  
Speech Intelligibility ◽  
Subjective Evaluation ◽  
Sound Field ◽  
Objective Evaluation ◽  
Sound Quality ◽  
Passenger Car ◽  
Factors Influencing ◽  
Intelligibility Test ◽  
Sound Environment ◽  
Speech Intelligibility Index

Speech intelligibility is one of the most important aspects of the study of sound quality inside vehicle. Speech intelligibility test is the direct approach to decide whether the listening environment inside vehicle is superior or inferior, but it has many short-comings in the process of subjective evaluation which is time-consuming, laborious and difficult of accomplishment. In this article, speech intelligibility index which is an objective evaluation index, is used for analyzing and evaluating the sound quality inside passenger car, and is calculated separately by two methods. By analyzing the factors influencing the speech intelligibility inside vehicle under different conditions, the methods to improve the sound environment are proposed, which can provide a direct significance for improving sound quality inside vehicle.

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