An Assessment of the Tire Noise Generation and Sound Propagation Characteristics of an ISO 10844 Road Surface

1997 ◽  
Author(s):  
Paul R. Donavan
Keyword(s):  
Sound Propagation ◽  
Road Surface ◽  
Noise Generation ◽  
Propagation Characteristics ◽  
Tire Noise

Wavelet‐based neural networks applied to automatic detection of road surface conditions using tire noise from vehicles.

2009 ◽  
Vol 125 (4) ◽  
pp. 2730-2730 ◽  
Author(s):  
Wuttiwat Kongrattanaprasert ◽  
Hideyuki Nomura ◽  
Tomoo Kamakura ◽  
Koji Ueda
Keyword(s):  
Neural Networks ◽  
Automatic Detection ◽  
Road Surface ◽  
Surface Conditions ◽  
Tire Noise

A Computational Fluid Dynamics Model for Investigating Air-Pumping Mechanisms in Air-Borne Tire Noise

2016 ◽  
Vol 44 (3) ◽  
pp. 191-211 ◽  
Author(s):  
Prashanta Gautam ◽  
Abhilash J. Chandy
Keyword(s):  
Stokes Equations ◽  
Road Traffic ◽  
Near Field ◽  
Spectral Characteristics ◽  
Small Scale ◽  
Road Traffic Noise ◽  
Far Field ◽  
Noise Generation ◽  
Tire Noise ◽  
Noise Characteristics

ABSTRACT The reduction in power train noise over the past decade has led to an increased focus in reducing tire/road noise, largely due to the environmental concerns related to road traffic noise in industrial countries. Computational fluid dynamic (CFD) simulations conducted using ANSYS FLUENT are presented here with the objective of understanding air-pumping noise-generation mechanisms due to tire/road interaction. The CFD model employs a large eddy simulation turbulence modeling approach, in which the filtered compressible Navier-Stokes equations are solved to obtain temporally and spatially accurate near-field pressure fluctuations for a two-dimensional (2D) tire geometry with (1) one groove and (2) two grooves. In addition, the Ffowcs-Williams and Hawkings (FW-H) acoustic model is used to predict far-field acoustics. The deformation of the grooves, as the tire rotates, is represented by prescribed sidewall movements. Consequently, the solution to the numerical problem is obtained through a single process, thereby enabling the prediction of small-scale air pumping, horn effect, and far-field acoustics in a single simulation. The acoustic characteristics associated with air pumping are studied through spectral analysis tools, and comparisons show that the additional groove on the horn geometry alters the spectral characteristics of air pumping. Validation of the model is conducted through qualitative and quantitative comparisons with previous studies. These simulations are intended to provide a deeper understanding about the small-scale noise generation as well as the near-field and far-field acoustics, thereby paving the way for the automotive manufacturer to compare a variety of air-related tire noise characteristics without spending time and money for vehicle pass-by tests.

A Novel Technique With a Magnetostrictive Transducer for In Situ Length Monitoring of a Distant Specimen

2003 ◽  
Author(s):  
Michael Pedrick ◽  
Michael Heckman ◽  
B. R. Tittmann
Keyword(s):  
High Precision ◽  
Temperature Effects ◽  
Sound Propagation ◽  
Sound Waves ◽  
Propagation Characteristics ◽  
Novel Technique ◽  
Flight Measurement ◽  
Magnetostrictive Sensor ◽  
Magnetostrictive Transducer

A Magnetostrictive sensor was used to generate sound waves in a specimen through thirty feet of wire. Many hardware aspects are discussed such as boundaries, materials, acoustic horn design, and sound propagation characteristics which facilitated the generation of sound energy in the specimen. Temperature effects on velocity and length were calculated and a model was developed to determine length from a time of flight measurement. The specimen was heated in an oven to various temperatures and times of flight were measured and compared to the model. Results show agreement between the measured values and the model as well as the ability for a high precision length measurement.

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