Dynamic Behavior of Rolling Tires Under Different Operating Conditions

Vercammen, Stijn; Díaz, Cristóbal González; Kindt, Peter; Thiry, Christophe; Middelberg, Jason; Leyssens, Jan

doi:10.1115/ncad2012-0910

Cited by 3 publications

(3 citation statements)

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“…The leading edge accelerations are around 5 dB to 15 dB [ref 9.81m/s 2 ] higher than at the trailing edge, for respectively the smooth and rough road surface. This corresponds with the higher response of backward travelling waves seen by Vercammen [215] and to results of Tsujiuchi [210] and Assink [7].…”

Section: Other Vibration Experimentssupporting

confidence: 86%

“…The Dopplershift in percentage of the frequency matches the percentage of speed difference as indicated by the (3,0) wave example. Furthermore, the backward travelling waves have higher response amplitudes with respect to forward travelling waves [215] as seen in the dark red spots of Figure 2.22.…”

Section: Loaded and Rotating Tyre: Dispersion Curvementioning

confidence: 92%

“…Vercammen [215] measured the radial vibrations of the tread centre of a 205/55R16 tyre by an accelerometer. The tyre was rolling at 40, 60 and 80 km/h, radially excited by a cleat.…”

Section: Loaded and Rotating Tyre: Dispersion Curvementioning

confidence: 99%

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Engineering tools for interior tyre tread pattern noise

Bekke¹

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The regular tyre tread pattern design process is often based upon experience and experimental evaluations and may take about 2 years. The use of engineering tooling could improve and speed up this process. The research objective is therefore to develop experimental and simulation tooling by which interior tyre tread pattern noise can be predicted, analysed and optimized.The physics of tyre-road noise is explained in a comprehensive manner as a thorough understanding of the physics is needed to evaluate, measure, analyse or optimize tyres with respect to noise. The first engineering tool developed is an instrumented vehicle with dedicated measurement and processing technologies, enabling quantification of the terminology used in subjective evaluations of tyre-road noise. The three most important tyre tread pattern noise characteristics are: level, tonalness and modulation/drumming. They can be quantified, respectively, by the Sound Pressure Level, the so-called order spectrum and the (bandpass filtered) sound pressure variation during one tyre revolution.While rolling on smooth roads, the tyre tread pattern geometry in the tyre-road contact is considered to be the main origin of contact pressure variations, resulting in vibrations and noise. The second engineering tool is a simulation procedure of this source. In the new source modelling approach, the averaged tread pattern height in contact is calculated. The model predicts (R 2 = 0.76) the correct trends of the three tyre tread pattern noise characteristics, by using the trend of their geometrical cause. The model can be used to reduce exterior as well as interior tyre tread pattern noise.From these tyre tread pattern noise characteristics dedicated Sound Quality Metrics are defined: for level the Standard Deviation (STD), for tonalness the Order Prominence (OP) and for modulation the Multi-Order Modulation (MOM). They correspond very well (respectively R 2 =0.96, 0.60 and 0.80) with the human perception of the noise characteristics. An increase in each of the metrics results in a worse subjective perception of the tyre tread pattern noise. The metrics are applicable for measured and simulated sounds.In the third engineering tool the three metrics are combined to model the human percpetion of tyre tread patternn noise. The human perception model is obtained through a linear regression of these tyre related Sound Quality Metrics on the subjective rating of simulated sounds. The output of the model is called the Sound Quality Preference Index (SQPI) predicting the human perception of tyre tread pattern sounds correctly (R 2 =0.94).The coupled source -human perception model can be used to speed up and improve the current tyre tread patter design process. 't In mekaar dreaien van 'n baandprofiel, doot wie nog vaak zoa a'w 't leerd hebt. Nen gladden baand maken in 't fabriek, 't baandprofiel der met 'n mes oetsnieden en dan loester noar 't baandgeloed in 'n auto. Dan noadeanken en bekiekt wie oons hoo o'w 't better maken könt. Dat kost onmeunig völ tied en doar kan w...

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Section: Other Vibration Experimentssupporting

confidence: 86%

Section: Loaded and Rotating Tyre: Dispersion Curvementioning

confidence: 92%

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Engineering tools for interior tyre tread pattern noise

Bekke¹

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Modal identification of cylindrical shell using circumference reduction method

Kitahara

Yoshimura

2015

Transactions of the JSME (In Japanese)

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For precision improvement of the noise prediction, the dynamic characteristics of structures need to be verified. This paper focuses on modal identification of the cylindrical shell structures. In such structures, vibration modes with complicated shapes exist densely. And structures made of composite material have high damping characteristics. Therefore, the experimental modal parameter extraction is somewhat difficult task. In this study, we investigate modal parameter identification method which is able to be applied to such structures. We propose circumference reduction method based on basis function, and non-linear least squares approach of curve-fitting. The circumference reduction method has an effect of reduction of modal density, so the difficulty of identification is improved. Using a simple cylindrical shell structure, the results of proposed method and FEM modal analysis are compared and evaluated. Furthermore, as an example of a real structure, the modal property of an automobile tire is identified. It is verified that the modal property of cylindrical shell structure can be identified effectively using proposed method.

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Method of Experimental Identification of Change in Dynamic Characteristics of Rolling Tires

Uesaka¹,

Suma²

2015

SAE Int. J. Passeng. Cars - Mech. Syst.

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Dynamic Behavior of Rolling Tires Under Different Operating Conditions

Cited by 3 publications

References 0 publications

Engineering tools for interior tyre tread pattern noise

Engineering tools for interior tyre tread pattern noise

Modal identification of cylindrical shell using circumference reduction method

Method of Experimental Identification of Change in Dynamic Characteristics of Rolling Tires

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