Power Spectral Density of Road Profiles

Davis, B.R.; Thompson, A. G.

doi:10.1076/vesd.35.6.409.2039

Cited by 45 publications

(25 citation statements)

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“…The brackets indicate the average with respect to both time and space, so that the term in brackets can be considered to be the mean square valué of the vibration speed. Furthermore, bearing in mind that, by virtue of Parseval's theorem [34], the mean square valué of a function is obtained by integrating its power spectral density, the term in brackets can be expressed as:…”

Section: Assessment Of Sound Power Generated By the Wheelmentioning

confidence: 99%

Effectiveness of resilient wheels in reducing noise and vibrations

Suarez

Chover

Rodríguez

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part F:

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This study focuses on the effectiveness of resilient wheels in reducing railway noise and vibrations, and compares the effectiveness of three types of wheels. The finite elements method has been used to characterise the vibratory behaviour of these wheels. The model has been excited with a realistic spectrum of vertical track irregularities, and a spectral analysis has been carried out. Results have been post-processed in order to estímate the sound power emitted. These calculations have been used to assess the effectiveness of the resilient wheel designs in reducing noise emitted to the environment and in propagating structural vibrations.

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Section: Assessment Of Sound Power Generated By the Wheelmentioning

confidence: 99%

Effectiveness of resilient wheels in reducing noise and vibrations

Suarez

Chover

Rodríguez

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…Différents modèles de véhicules cités dans la littérature ont été utilisés pour étudier le comportement dynamique et vibratoire [ 3,6,10,13,14,16,19,20,21 ]. Les trois modèles couramment utilisés sont les suivants : un quart de véhicule, demi-véhicule ou le modèle complet de véhicule en 3 dimensions.…”

Section: Modèles De Véhiculesunclassified

“…• De la figure 3.3, le vecteur de la vitesse angulaire {a> 3 } ] est parallèle à l'axe de rotation AB et {co 2 }, parallèle à 1 axe EF.…”

Section: Approche De Modélisationunclassified

Effet des sollicitations de la route sur les pièces de suspension en aluminium /

Saihi¹

2012

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“…already applied in [5][6][7]. Note, that the road spectrum S z (ω) is only applicable for stationary problems.…”

Section: Introduction Of One-dimensional Random Road Profilesmentioning

confidence: 97%

Jump phenomena in road-vehicle dynamics

Wedig

2015

Int. J. Dynam. Control

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Provided that vehicles are riding with constant velocity, the mean value of the car driving force needed to compensate energy dissipation through the wheel damping, is calculated. For suitably strong harmonic road excitations, there are two stable and one unstable velocity near the critical speed of the car. This behavior is extended to the case of stochastic roads that shows corresponding effects when the calculated mean driving force is plotted versus the constant car velocity. More important is the inverse case that the driving force of the car is fixed by means of a suitable control meanwhile the car velocity is variable and fluctuates around a stationary mean value. For small car damping and narrowbanded road profile, a further acceleration of under-critical car velocities is no longer possible because of the blockade by the resonance characteristic. The car velocity finally jumps to much higher speeds when the driving force is strongly reinforced in order to pass over the resonance peak. This behavior is investigated for stochastic road profiles described by new second order filter equations under additive white noise applied to the across and along dynamics of quarter car models. To clarify main original contributions, this paper presents first investigations of the along dynamics of quarter car models applying a new nonlinear first order car equation which is strongly coupled through randomly fluctuating car velocities with the second order road and car equations of the vertical road and car displacements, respectively. The associated systematic behavior is numerically investigated by means of covariance equations showing jump phenomena of B Walter V. Wedig the mean car velocity that corresponds to the Sommerfeld effect, well-known in rotor dynamics.

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Power Spectral Density of Road Profiles

Cited by 45 publications

References 0 publications

Effectiveness of resilient wheels in reducing noise and vibrations

Effectiveness of resilient wheels in reducing noise and vibrations

Effet des sollicitations de la route sur les pièces de suspension en aluminium /

Jump phenomena in road-vehicle dynamics

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