Experimental investigation of the effect of speed bumps in sequence on noise emission level from motor vehicles

2015 ◽  
Vol 63 (6) ◽  
pp. 582-597
Author(s):  
Natalia Distefano ◽  
Salvatore Leonardi
Keyword(s):  
Experimental Investigation ◽  
Motor Vehicles ◽  
Noise Emission ◽  
Emission Level

Experimental Investigation of Noise Sources in a Needle Roller Bearing System

1999 ◽  
Author(s):  
Niccolò Baldanzini ◽  
Federico Beraldo ◽  
Monica Carfagni
Keyword(s):  
Experimental Investigation ◽  
Online Monitoring ◽  
Roller Bearing ◽  
Practical Method ◽  
Sound Power ◽  
Noise Emission ◽  
Noise Sources ◽  
Outer Race ◽  
Bearing System ◽  
Race Analysis

Abstract An experimental investigation was undertaken to determine the causes of noise emission scatter in hosiery machines. Following the experimental measurement of the sound power levels, the hosiery machine’s mechanical system was assembled and tested with components of various sizes. The results indicated that the source of the noise emissions was a bearing’s outer race. Analysis of the outer race’s roundness profile in relation to vibrations provided accurate predictions of machine behavior. On the basis of a correlation between noise and vibrations, a practical method of online monitoring was developed.

Surface Topography and Noise Emission in Gearboxes

1997 ◽  
Author(s):  
Naser Amini ◽  
B. G. Rosén
Keyword(s):  
Experimental Investigation ◽  
Total Energy ◽  
Surface Topography ◽  
Noise Generation ◽  
Test Rig ◽  
Noise Emission ◽  
Applied Torque ◽  
Surface Topographies ◽  
Before And After ◽  
Noise Assessment

Abstract This paper, by the experimental investigation, deals with the effect of different surface topographies on noise generation in gears. Results from the noise assessment of one gear before and after honing are discussed. The honing operation was applied to the gear after the grinding. The gear was tested in an actual gearbox, operated in a test rig. Running conditions were systematically changed during the test; however, the same conditions were utilized for the gear before and after honing. The aim of the study was to identify the mechanism of the expected noise reduction, with surfaces being evaluated in 3D. The following results have been obtained: The total energy in the noise decreases significantly. The magnitude of the tooth-mesh frequency dose not change, but the level of its higher harmonics decreases significantly. These reductions are especially significant, when running at higher rotational speeds or when the applied torque is increased.

scholarly journals Experimental investigation of a diesel engine power, torque and noise emission using water–diesel emulsions

Fuel ◽  
2016 ◽  
Vol 166 ◽  
pp. 392-399 ◽  
Author(s):  
Mohammad Reza Seifi ◽  
Seyed Reza Hassan-Beygi ◽  
Barat Ghobadian ◽  
Umberto Desideri ◽  
Marco Antonelli
Keyword(s):  
Experimental Investigation ◽  
Diesel Engine ◽  
Noise Emission ◽  
Engine Power

Experimental Investigation of Tonal Self-Noise Emission of a Vehicle Side Mirror

AIAA Journal ◽  
2017 ◽  
Vol 55 (5) ◽  
pp. 1673-1680 ◽  
Author(s):  
M. J. Werner ◽  
W. Würz ◽  
E. Krämer
Keyword(s):  
Experimental Investigation ◽  
Noise Emission

Numerical and experimental investigation of a beveled trailing-edge flow field and noise emission

2016 ◽  
Vol 384 ◽  
pp. 113-129 ◽  
Author(s):  
W.C.P. van der Velden ◽  
S. Pröbsting ◽  
A.H. van Zuijlen ◽  
A.T. de Jong ◽  
Y. Guan ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Flow Field ◽  
Noise Emission ◽  
Trailing Edge ◽  
Beveled Trailing Edge ◽  
Edge Flow

Residential Noise Damage Costs Caused by Motor Vehicles

1996 ◽  
Vol 1559 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Daniel Haling ◽  
Harry Cohen
Keyword(s):  
Cost Estimation ◽  
Operating Conditions ◽  
Motor Vehicles ◽  
Residential Areas ◽  
Noise Emission ◽  
Vehicle Noise ◽  
Damage Costs ◽  
Emission Models ◽  
Noise Damage ◽  
The Cost

An estimate of noise damage costs caused by motor vehicles has been performed. The damage calculation is based on the reduction of property values caused by vehicle noise emissions. Noise emission models are used to determine the noise levels emitted by various vehicle types, dependent on speed, volume of traffic on the roadway, and type of housing development that surrounds the roadway. The cost estimation illustrates the large variation in noise damage caused by different vehicle types, operating conditions, and location of the roadway in relation to residential areas.

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