The Use of Experimental SEA for Modeling Road Noise in Cars

1999 ◽  
Author(s):  
L. Hermans ◽  
K. De Langhe ◽  
M. Iadevaia
Keyword(s):  
Factor Model ◽  
Sensitivity Study ◽  
Road Noise ◽  
Noise Sources ◽  
Design Modification ◽  
The Road ◽  
Confidence Levels ◽  
Airborne Noise ◽  
Power Inputs ◽  
On The Road

Abstract Over the last years, SEA has been recognized as a useful tool to model and analyze the high-frequency vibro-acoustic behavior of fully assembled complex structures. This paper discusses the experimental derivation of the loss factor model of a passenger car. The paper outlines the different steps which need to be taken to obtained a fully validated experimental SEA model. This includes the subdivision into subsystems, the PIM measurement campaign, the derivation of the loss factors and their associated confidence levels and the model validation. The paper further details how the experimental SEA model was used to quantify and investigate the airborne and structure-borne contributions to the interior noise level for a road noise test condition. The operational power inputs to the vehicle were indirectly determined from operational response measurements. A contribution analysis showed that airborne noise sources dominated structure-borne noise sources above 500Hz. A sensitivity study allowed to propose an effective design modification. This modification was implemented and successfully tested on the road.

The Effects of Suspension Component Stiffness on the Road Noise: A Sensitivity Study and Optimization

2018 ◽  
Author(s):  
Joong-Kwan Kim ◽  
Jinmo Lee ◽  
Hyoung-Gun Kim ◽  
Munhwan Cho ◽  
Kang-Duck Ih ◽  
...  
Keyword(s):  
Sensitivity Study ◽  
Road Noise ◽  
The Road ◽  
On The Road

scholarly journals Design Modification of Automated Power Window Circuit System for Automobiles Air -Condition.

2020 ◽  
pp. 264-270
Author(s):  
Joseph Sekyi-Ansah ◽  
James Kwasi Quaisie ◽  
Isaac Eduyah ◽  
Mohammed Okoe Alhassan ◽  
Eric Quansah ◽  
...  
Keyword(s):  
21St Century ◽  
Automobile Industry ◽  
Air Conditioning ◽  
Air Conditioner ◽  
Design Modification ◽  
The Road ◽  
Turn On ◽  
On The Road

Air conditioning has become a key component in the automobile industry now, and almost every vehicle manufactured in the 21st century has air conditioning integrated. Most drivers drive with their air conditioning on while some of their windows are not fully closed; this affects the operation of the air conditioning. In addition, if the driver wants to turn on the air conditioning while driving, he or she has to move up the power windows manually after or before he or she turns on the air conditioning, which may affect his or her concentration on the road. The concept of this power window circuit system is to automatically close the windows after a few seconds when the air conditioner is turned on.

The Study of Tire Pattern Noise by Using Wavelet Transform

2011 ◽  
Vol 105-107 ◽  
pp. 267-270 ◽  
Author(s):  
Sung Wook Hwang ◽  
Jin Hyuk Han ◽  
Ki Duck Sung ◽  
Sang Kwon Lee
Keyword(s):  
Fourier Transform ◽  
Wavelet Transform ◽  
The Other ◽  
Road Noise ◽  
Signal Process ◽  
The Road ◽  
Pattern Noise ◽  
On The Road ◽  
Non Stationary Signal ◽  
The Relationship

Tire noise is classified by pattern noise and road noise in a vehicle. Especially pattern noise has impulsive characteristics since it is generated by impacting of tire’s block on the road. Therefore, a special signal process is needed other than traditional Fourier Transform, because the characteristic of signal is varying with time. On the other hand, the pattern noise is a kind of non-stationary signal and is related to the impulsive train of pitch sequence of a block. In this paper, Wavelet Transform is applied to verify the impulse signal caused by impact of block and groove and to verify the relationship between the pattern noise and the train of pitch sequence.

Noise emission of combustion engines and road vehicles - a historical review

2021 ◽  
Vol 263 (4) ◽  
pp. 2095-2101
Author(s):  
Bruno Spessert ◽  
Martin Fischer
Keyword(s):  
Combustion Process ◽  
Historical Review ◽  
Combustion Engines ◽  
The European Union ◽  
Road Noise ◽  
Noise Emission ◽  
Road Vehicles ◽  
Noise Sources ◽  
Noise Stress ◽  
The Road

This paper deals with the historical development of the noise emission of cars, trucks and their petrol and diesel engines; it focus on the European Union and the time period between 1910 and 2020. Combustion engines were and are important noise sources of road vehicles. Until around 1970 engine noise levels were increased strongly by higher speeds, by higher cylinder pressures and especially for truck engines by the introduction of the diesel combustion process. The noise emission was mainly caused by the drive train until the 1960ies for cars and until the 1970ies for trucks. Since then the development of acoustically more advantageous engines was forced by noise regulations and simultaneously enabled by technical advancements. As a consequence of the acoustical optimization of the engines the tire/road noise became dominant. Despite of the technical advancements the road noise stress of the population is still much too high. Therefor the necessary short-term reduction of noise stress has to be realized by regulatory measures.

Community Colleges: Vital Partners on the Road to Diversity

ASHA Leader ◽  
2006 ◽  
Vol 11 (5) ◽  
pp. 14-17 ◽  
Author(s):  
Shelly S. Chabon ◽  
Ruth E. Cain
Keyword(s):  
Community Colleges ◽  
The Road ◽  
On The Road

The Role of Crushes on the Road to Autonomy

2009 ◽  
Vol 43 (9) ◽  
pp. 18-19
Author(s):  
MICHAEL S. JELLINEK
Keyword(s):  
The Road ◽  
On The Road

Homoeroticism Beats Homophobia on the Road

PsycCRITIQUES ◽  
2013 ◽  
Vol 58 (31) ◽  
Author(s):  
David Manier
Keyword(s):  
The Road ◽  
On The Road

On the Road From Induction to Utilization

PsycCRITIQUES ◽  
2014 ◽  
Vol 59 (52) ◽  
Author(s):  
Donald Moss
Keyword(s):  
The Road ◽  
On The Road
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