Compliance Steer and Road Holding of Rigid Rear Axle for Enhancing the Running Straightness of Large Sized Vehicles

Momiyama, Fujio; Miyazaki, Kiyoaki

doi:10.4271/933009

Cited by 7 publications

(4 citation statements)

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“…The suspension, subframe and chassis systems are compliant to a greater or lesser extent: compliance in the suspension system may be necessary to achieve a good ride characteristic, but an undesirable side e ect can be 'compliance steer', which results from the application of lateral or longitudinal forces at the tyre contact patch. These forces de ect the suspension bushings and change the camber and toe angles [4,5], and thus are considered to be one of the biggest contributors to straight-line stability during braking.…”

Section: Introductionmentioning

confidence: 99%

Steering drift and wheel movement during braking: Parameter sensitivity studies

Klaps

Day

2003

Proceedings of the Institution of Mechanical Engineers, Part D:

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Abstract:In spite of the many signi cant improvements in car chassis design over the past two decades, steering drift during braking where the driver must apply a corrective steering torque in order to maintain course can still be experienced under certain conditions while driving. In the past, such drift, or 'pull', would have been attributed to side-to-side braking torque variation [1], but modern automotive friction brakes and friction materials are now able to provide braking torque with such high levels of consistency that side-to-side braking torque variation is no longer regarded as a cause of steering drift during braking. Consequently, other in uences must be considered. This paper is the rst of two papers to report on an experimental investigation into braking-related steering drift in motor vehicles. Parameters that might in uence steering drift during braking include suspension compliance and steering o set, and these have been investigated to establish the sensitivity of steering drift to such parameters. The results indicate how wheel movement arising from compliance in the front suspension and steering system of a passenger car during braking can be responsible for steering drift during braking. Braking causes changes in wheel alignment which in turn a ect the toe steer characteristics of each wheel and therefore the straight-line stability during braking. It is concluded that a robust design of suspension is possible in which side-to-side variation in toe steer is not a ected by changes in suspension geometry during braking, and that the magnitude of these changes and the relationships between the braking forces and the suspension geometry and compliance require further investigation, which will be presented in the second paper of the two.

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Section: Introductionmentioning

confidence: 99%

Steering drift and wheel movement during braking: Parameter sensitivity studies

Klaps

Day

2003

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Traditional RACS technology focuses on how to rationally use the compliance characteristics of the rear suspension [4]. In recent years, more and more smart material has been developed, such as magnetorheological fluid (MRF), magnetorheological elastomer (MRE), memory alloy, electrostrictive material, and piezoelectric material [5].…”

Section: Introductionmentioning

confidence: 99%

Hopf Bifurcation Characteristics of the Vehicle with Rear Axle Compliance Steering

Chen

Zhang

et al. 2019

Shock and Vibration

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To overcome the shortage of traditional rear axle compliance steering (RACS) technology, a kind of viscoelastic smart material is introduced into the rear suspension of a vehicle to construct rear wheel semiactive steering system. is article focuses on the nonlinear dynamic behavior of the vehicle with RACS incorporating viscoelastic smart material. First of all, considering the tire nonlinearity and the fractional derivative constitutive relation of the viscoelastic material, the nonlinear dynamic model of the vehicle with RACS is formulated. en, the lateral dynamic behavior of the vehicle with RACS is demonstrated through numerical experiments. Finally, some factors that influence shimmy of the compliance steering wheel are investigated. Numerical results demonstrate the Hopf bifurcation characteristics of the vehicle with RACS and disclose the influence factors of Hopf bifurcation characteristics for the vehicle with RACS, which lay the theoretical foundation for the development of the rear wheel semiactive steering technology.

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“…As one of effective rear wheel steering modes for passenger cars, rear axle compliance steering (RACS) is popularly adopted to improve the vehicle stability at high speed [1,2]. RACS utilizes the tire lateral force and the lateral elasticity of the rear suspension rather than any special steering mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies on this problem can be classified as two streams in terms of the research method: one is experimental method, and the other is numerical method. In the former stream, Momiyama and Miyazaki [2] investigated the compliance under steer technology of the rigid axle rear suspension through calculation and the actual vehicle test; Mou [3] studied the steering characteristics of the compliance suspension used in Citroën-ZX series cars through experiments; Pan et al [4] analyzed the rear axle compliance steering performance of the vehicle with five-link non-independent rear suspension and verified the results through experiments. In the latter stream, Guo and Yin [1] illustrated the rear axle compliance structure for torsion beam suspension and revealed its compliance steering principle; Li and Chen [5] performed stability and robustness of compliance steering system; Ticã et al [6] studied the influence of compliance on an elastokinematic model of a proposed rear suspension; Wang et al [7] carried out a preliminary research on the relationship between compliance steering stiffness and vehicle yaw rate.…”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior of a vehicle with rear axle compliance steering

Xu¹,

Jiang²,

Chen³

et al. 2017

J. vibroeng.

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Rear axle compliance steering (RACS) is a technology of passive four-wheel steering, which is designed to improve the vehicle handling and stability at medium or high speed. This paper focuses on the dynamic behavior of the vehicle with RACS. Firstly, the compliance steering principle for different rear suspensions is illustrated. Then, the viscoelastic members with fractional order derivative properties are introduced into RACS, and the fractional order model of RACS is formulated. Next, the dynamic model of the vehicle with RACS is established, the adjusting rules for the compliance steering stiffness are derived, and the vehicle stability is investigated. Finally, numerical experiments are performed to illustrate the effects on the vehicle dynamic behavior caused by the compliance steering stiffness, the viscoelastic members and the vehicle longitudinal velocity. Research results show that, the vehicle with RACS has better dynamic characteristics than that without RACS at medium or high speed; and the compliance steering stiffness, the viscoelastic members and the vehicle longitudinal velocity have different impacts on the vehicle lateral dynamic behavior.

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Compliance Steer and Road Holding of Rigid Rear Axle for Enhancing the Running Straightness of Large Sized Vehicles

Cited by 7 publications

References 0 publications

Steering drift and wheel movement during braking: Parameter sensitivity studies

Steering drift and wheel movement during braking: Parameter sensitivity studies

Hopf Bifurcation Characteristics of the Vehicle with Rear Axle Compliance Steering

Dynamic behavior of a vehicle with rear axle compliance steering

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