Influence of Multiharmonics Excitation on Rattle Noise in Automotive Gearboxes

Kadmiri, Younes; Perret-Liaudet, Joël; Rigaud, Emmanuel; Bot, Alain Le; Vary, Laurence

doi:10.1155/2011/659797

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…The coefficient of restitution r = 0.65, is suitable in gear rattle analysis, according to Ref. [51].…”

Section: Simulation Setupmentioning

confidence: 99%

Nonlinear dynamic behaviour and severity of lightly loaded gear rattle under different vibro-impact models and internal excitations

Zhou,

Shi,

Guo

et al. 2023

Nonlinear Dyn

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This investigation comprehensively compared the elastic contact and the modified stiff impact models, aiming for the lightly loaded backlash-induced gear rattle. Three meshing force models in backlash are incorporated into the elastic model independently. Unlike the previous uncoupled stiff impact model, the modified impact model considers the coupling between the pinion and gearwheel. Three scenarios were investigated with different components of two internal excitations, static transmission error (STE) induced periodical backlash and the time-varying meshing stiffness (TVMS). The analytical results show that the free and forced gear motion, nonlinear characteristics and rattle severity are strongly affected by STE rather than TVMS. Two studied hydrodynamic lubricant (HDL) models show different damping effects. The forced gear motion state and rattle sensitivities show a noticeable difference below 40rad/s 2 and turn to a slight variation above 60rad/s 2 . Finally, the HDL model containing only the oil squeeze effect will likely match the experimental results. The experimentally detected STE component of the gearwheel suggests that an acceptable model should be considered in the gear rattle model.

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“…The coefficient of restitution r = 0.65, is suitable in gear rattle analysis, according to Ref. [51].…”

Section: Simulation Setupmentioning

confidence: 99%

Nonlinear dynamic behaviour and severity of lightly loaded gear rattle under different vibro-impact models and internal excitations

Zhou,

Shi,

Guo

et al. 2023

Nonlinear Dyn

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“…While TE is the dominant source of excitation in geared systems, other phenomena also contribute to the overall dynamic behavior. One of the most easily recognizable secondary sources is the fluctuation of the torque, which in automotive gearboxes can generate vibro-impacts and therefore rattle noise [81] as experimentally investigated in [82]. Wind turbines suffer torque oscillations due to the unsteady aerodynamics [83] as well as vacuum pumps due to low fluidic drag torque interactions [84].…”

Section: Other Sourcesmentioning

confidence: 99%

Sources of Excitation and Models for Cylindrical Gear Dynamics: A Review

Bruzzone

Rosso

2020

Machines

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In this paper, a review of the evolution of the study of cylindrical gear dynamics is presented. After a brief historical introduction to the field, the first attempts to describe the complex interactions in those systems are analyzed introducing the dynamic factor and the first methodologies used to compute it. Next, the sources of excitation in geared systems are analyzed in detail and the models of the various contributions are discussed. Then, the paper focuses on the use of those sources in several dynamic models which are wildly different in terms of scope, applicability, complexity and methodology employed, ranging from simple analytical models, to lumped masses models up to multibody and finite element models. Finally, an outlook to the future evolution of the field is given and conclusions are drawn.

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“…The response to the STE has naturally been studied [63,61]. The response to torque fluctuations was also investigated using both harmonic [25,27,57] and multiharmonic excitations [4,24]. Several studies were also carried out considering a stochastic excitation [29,58], variable backlash [41,48] and variable tooth profile deviations [39].…”

Section: Introductionmentioning

confidence: 99%

Effect of gear topology discontinuities on the nonlinear dynamic response of a multi-degree-of-freedom gear train

Mélot

Benaïcha

Rigaud

et al. 2022

Journal of Sound and Vibration

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Weight reduction is a recurring concern in the design of modern mechanical systems. This search may lead engineers to resort to using gears with holes in order to meet their requirements. This paper presents a methodology to carry out nonlinear dynamic analyses of a gear transmission with holes in the gear blanks subjected to a multiharmonic internal excitation. This work investigates the influence of these holes on the vibration levels, occurence of contact loss and possible bifurcations. The numerical model features two flexible shafts coupled by a spur gear pair with holes. The gear model consists in two lumped masses and inertias and includes the gear backlash as well as the internal excitation sources that are the time-varying stiffness and the static transmission error (STE). The resulting mechanical system is solved in the frequency domain by the Harmonic Balance Method (HBM) coupled with an arc-length continuation algorithm and its stability is evaluated with Hill's method. Results show that adding holes not only impacts the STE but also the mesh stiffness. The interactions of these two quantities has a substantial influence on the bifurcation structure along the main solution branch and leads to a decrease of the span of vibro-impact regions. As the applied static torque is increased, it is found that using holed gear blanks can effectively prevent contact loss and lead to a linear response.

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Influence of Multiharmonics Excitation on Rattle Noise in Automotive Gearboxes

Cited by 8 publications

References 9 publications

Nonlinear dynamic behaviour and severity of lightly loaded gear rattle under different vibro-impact models and internal excitations

Nonlinear dynamic behaviour and severity of lightly loaded gear rattle under different vibro-impact models and internal excitations

Sources of Excitation and Models for Cylindrical Gear Dynamics: A Review

Effect of gear topology discontinuities on the nonlinear dynamic response of a multi-degree-of-freedom gear train

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