HVAC noise control using natural materials to improve vehicle interior sound quality

2018 ◽  
Vol 140 ◽  
pp. 100-109 ◽  
Author(s):  
Sneha Singh ◽  
A.R. Mohanty
Keyword(s):  
Noise Control ◽  
Sound Quality ◽  
Vehicle Interior ◽  
Natural Materials

Sound Quality Evaluation for the Vehicle HVAC System After Active Noise Control

2008 ◽  
Author(s):  
In Hyung Yang ◽  
O. Cheol Kwon ◽  
Jung Youn Lee ◽  
Jae-Eung Oh
Keyword(s):  
Regression Model ◽  
Noise Control ◽  
Subjective Evaluation ◽  
Active Noise Control ◽  
Sound Quality ◽  
Interior Noise ◽  
Hvac System ◽  
Vehicle Interior ◽  
Active Noise ◽  
Vehicle Interior Noise

The reduction of the Vehicle interior noise has been the main interest of NVH engineers. The driver’s perception on the vehicle noise is affected largely by psychoacoustic characteristic of the noise as well as the SPL. In particular, the HVAC sound among the vehicle interior noise has been reflected sensitively in the side of psychology. In previous study, we have developed to verify identification of source for the vehicle HVAC system through multiple-dimensional spectral analysis. Also we carried out objective assessments on the vehicle HVAC noises and subjective assessments have been already performed with 30 subjects. In this study, the linear regression models were obtained for the subjective evaluation and the sound quality metrics. The regression procedure also allows you to produce diagnostic statistics to evaluate the regression estimates including appropriation and accuracy. Appropriation of regression model is necessary to R2 value and F-value. And testing for regression model is necessary to Independence, Homoscedesticity and Normality. To enhance sound quality, we applied active noise control (ANC) which is effective in the low-frequency bandwidth. Primary noise of the HVAC system is less than 500Hz. As a result of ANC application, sound quality is improved by more quiet, powerful, expensive, smooth.

Active control for vehicle interior noise using the improved iterative variable step-size and variable tap-length LMS algorithms

2019 ◽  
Vol 67 (6) ◽  
pp. 405-414 ◽  
Author(s):  
Ningning Liu ◽  
Yuedong Sun ◽  
Yansong Wang ◽  
Hui Guo ◽  
Bin Gao ◽  
...  
Keyword(s):  
Steady State ◽  
Noise Control ◽  
Convergence Speed ◽  
Interior Noise ◽  
Lms Algorithm ◽  
Variable Step Size ◽  
Step Size ◽  
Vehicle Interior ◽  
Vehicle Interior Noise ◽  
Variable Step

Active noise control (ANC) is used to reduce undesirable noise, particularly at low frequencies. There are many algorithms based on the least mean square (LMS) algorithm, such as the filtered-x LMS (FxLMS) algorithm, which have been widely used for ANC systems. However, the LMS algorithm cannot balance convergence speed and steady-state error due to the fixed step size and tap length. Accordingly, in this article, two improved LMS algorithms, namely, the iterative variable step-size LMS (IVS-LMS) and the variable tap-length LMS (VT-LMS), are proposed for active vehicle interior noise control. The interior noises of a sample vehicle are measured and thereby their frequency characteristics. Results show that the sound energy of noise is concentrated within a low-frequency range below 1000 Hz. The classical LMS, IVS-LMS and VT-LMS algorithms are applied to the measured noise signals. Results further suggest that the IVS-LMS and VT-LMS algorithms can better improve algorithmic performance for convergence speed and steady-state error compared with the classical LMS. The proposed algorithms could potentially be incorporated into other LMS-based algorithms (like the FxLMS) used in ANC systems for improving the ride comfort of a vehicle.

Adaptive Active Vehicle Interior Noise Control Algorithm Based on Nonlinear Signal Reconstruction

2020 ◽  
Vol 39 (10) ◽  
pp. 5226-5246
Author(s):  
Xiaolan Wang ◽  
Tongzhou Wang ◽  
Lili Su ◽  
Yansong Wang ◽  
Dongpo Yang ◽  
...  
Keyword(s):  
Control Algorithm ◽  
Noise Control ◽  
Signal Reconstruction ◽  
Interior Noise ◽  
Vehicle Interior ◽  
Vehicle Interior Noise ◽  
Nonlinear Signal

scholarly journals Evaluation of vehicle interior sound quality using a continuous restricted Boltzmann machine-based DBN

2017 ◽  
Vol 84 ◽  
pp. 245-267 ◽  
Author(s):  
Hai B. Huang ◽  
Ren X. Li ◽  
Ming L. Yang ◽  
Teik C. Lim ◽  
Wei P. Ding
Keyword(s):  
Sound Quality ◽  
Restricted Boltzmann Machine ◽  
Boltzmann Machine ◽  
Vehicle Interior

scholarly journals Influence of Multiharmonics Excitation on Rattle Noise in Automotive Gearboxes

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Y. Kadmiri ◽  
J. Perret-Liaudet ◽  
E. Rigaud ◽  
A. Le Bot ◽  
L. Vary
Keyword(s):  
Sound Quality ◽  
Excitation Source ◽  
Free Flight ◽  
Vehicle Interior ◽  
Velocity Fluctuations ◽  
Engine Torque ◽  
Acoustic Comfort ◽  
Excitation Period ◽  
Harmonic Components ◽  
The Impact

We consider the automotive gearbox rattle noise resulting from vibro-impacts that can occur between the idle gears under excessive velocity fluctuations of the shaft-driving gears imposed by engine torque fluctuation. Even if the rattling phenomenon has no consequence on reliability, it may be particularly annoying for vehicle interior sound quality and acoustic comfort. The main parameters governing such kind of vibrations are the excitation source associated with engine torque fluctuation which can be modeled by an imposed displacement of the driveline, the inertia of the idle gear, the drag torque acting during the free flight motion, and the impact laws. In the case of rattle, it is reasonable to assume that duration of impacts between teeth is very short compared to the excitation period. Then, these impacts are modeled by a coefficient of restitution law. The excitation source is not composed only with fundamental component but also with other harmonic components. This study presents some effects of these additional components on the dynamic response of the idle gear.

Subjective Analysis and Objective Evaluation of Vehicle Sound Quality

2013 ◽  
Vol 716 ◽  
pp. 674-679 ◽  
Author(s):  
Yan Yan Zuo ◽  
Shuai Li Zhou ◽  
Wen Feng Zhou
Keyword(s):  
Constant Velocity ◽  
Paired Comparison ◽  
Subjective Evaluation ◽  
Objective Evaluation ◽  
Sound Quality ◽  
Comparison Method ◽  
Acoustical Parameters ◽  
Vehicle Interior ◽  
Subjective Analysis ◽  
Evaluation Test

The interior noise samples from four cars at different positions and different speeds were selected as the evaluation objects. The subjective evaluation test of sound quality preference was carried out with paired comparison method. Several objective psycho-acoustical parameters of these samples were calculated. By way of linear correlation and multi-dimensional regression analysis, an equation between the subjective evaluation of noise preference and the objective psycho-acoustical parameters was established. The results indicate that the vehicle interior sound quality preference under the good highway and the constant-velocity driving conditions is affected mainly by two psycho-acoustical parameters Loudness and Sharpness.

scholarly journals A Study on BSR Noise and Sound Quality Property for Vehicle Interior Module

2012 ◽  
Vol 22 (6) ◽  
pp. 550-555 ◽  
Author(s):  
Su-Hyun Shin ◽  
Cheol-Ung Cheong ◽  
Sung-Soo Jung ◽  
Dae-Hwan Kang
Keyword(s):  
Sound Quality ◽  
Vehicle Interior ◽  
Quality Property
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