An Experimental Examination of J-Turn and Fishhook Maneuvers That May Induce On-Road, Untripped, Light Vehicle Rollover

Forkenbrock, Garrick; Garrott, W. Riley; Heitz, Mark; O'Harra, Bryan C.

doi:10.4271/2003-01-1008

Cited by 44 publications

(11 citation statements)

References 2 publications

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“…In the first set of simulations used in this paper, the vehicles are subjected to the well-known fishhook manoeuvre [19]. The steering input is applied to both models under the same conditions: the vehicle velocity is 75 km/h and the maximum steering angle is 270 • .…”

Section: Steering Inputmentioning

confidence: 99%

Hydraulically interconnected vehicle suspension: handling performance

Smith

Zhang

2011

Vehicle System Dynamics

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This paper extends recent research on vehicles with hydraulically interconnected suspension (HIS) systems. Such suspension schemes have received considerable attention in the research community over the last few years. This is due, in part, to their reported ability to provide stiffness and damping rates dependent on the suspension mode of operation (i.e. the bounce, roll, pitch or articulation of the unsprung masses relative to the sprung mass), rather than relying on the stiffness and damping characteristics of the single wheel stations. The paper uses a nine-degrees-of-freedom (DOF) vehicle model and simulations of a fishhook manoeuvre to assess the handling performance of a vehicle when it is fitted with: (a) a conventional independent suspension, and (b) an HIS. In the case of the latter, the fluid subsystem is modelled using a nonlinear finite-element approach, resulting in a set of coupled, first-order nonlinear differential equations, which describe the dynamics of the integrated mechanicalhydraulic vehicle system. The simulation results indicate that, in general, the HIS-equipped vehicle possesses superior handling, as measured by the sprung mass roll angle, roll rate, roll acceleration, lateral acceleration and the vehicle's Rollover Critical Factor. The potential effects of the suspension set-up on ride performance are also considered by studying the transient response when one side of the vehicle traverses a half-sine bump. The obtained results are then discussed, and it is shown that they are consistent with previous findings, both by the authors and other researchers. The presented work outlines an alternative approach for studying the dynamics of HIS-equipped vehicles, particularly suited to analyses in the time domain.

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Section: Steering Inputmentioning

confidence: 99%

Hydraulically interconnected vehicle suspension: handling performance

Smith

Zhang

2011

Vehicle System Dynamics

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“…In particular, the impulsive moment simulates an initial maximum role rate of 105 deg/sec. This roll rate is nearly twice as large as the maximum value of about 52 deg/sec reported during Fishhook Maneuver vehicle rollover testing specified by NHTSA [22][23][24]. Figure 6 shows the time histories of left wheel displacement (thinsolid line), right wheel displacement (dot line) and vehicle roll angular displacement (thick-solid line) when the impulsive moment is applied at t=0.1 sec for the duration of only 0.01 sec.…”

Section: Resultsmentioning

confidence: 89%

“…Recently, more novel HIS systems have been reported [19][20][21][22] and the superiority of these systems was demonstrated experimentally using the US National Highway Traffic Safety Administration's (NHTSA) Fishhook Maneuver [23,24]. Vehicle testing is used as the main tool for improving the HIS dynamic characteristics, however, this requires much effort and time during the product development process.…”

Section: Introductionmentioning

confidence: 99%

Transient Characteristics of a Hydraulically Interconnected Suspension System

Jeyakumaran¹,

Smith²,

Zhang³

2007

SAE Technical Paper Series

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This paper describes vehicle dynamic models that capture the large amplitude transient characteristics of a passive Hydraulically Interconnected Suspension (HIS) system. Accurate mathematical models are developed to represent pressure-flow characteristics, fluid properties, damper valves, accumulators and nonlinear coupling between mechanical and fluid systems. The vehicle is modeled as a lumped mass system with half-and fullcar configurations. The transient performance is demonstrated by numerical integration of the secondorder nonlinear differential equations. The stiffness and damping characteristics corresponding to vehicle bounce, roll and pitch motions are extracted from the transient simulation. Simulation results clearly demonstrate the superiority of the HIS system during vehicle handling and stability by providing additional roll stiffness and reduced articulation stiffness.

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“…The paper reports on an experimental handling investigation and compares a conventional suspension with four kinetic H2 system arrangements -high stiffness/damping, low stiffness/ damping, and combinations of the two. The US National Highway Traffic Safety Administration's "Fishhook" Manoeuvre [40,41] was employed, and it was found that the kinetic-equipped vehicles with high roll stiffness provided the greatest rollover resistance. Roll damping was also shown to have an affect, but not to the same extent.…”

Section: Recent Research and State Of Current Knowledge On Kinetic Sumentioning

confidence: 99%

Recent developments in passive interconnected vehicle suspension

Smith

Zhang

2009

Front. Mech. Eng. China

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This paper presents an overall review on the historical concept development and research advancement of passive hydraulically interconnected suspension (HIS) systems. It starts with an introduction to passive HIS systems and their various incarnations developed over many decades. Next, a description is provided of a recently proposed multidisciplinary approach for the frequencydomain analysis of vehicles fitted with an HIS. The experimental validation and applications of the method to both free and forced vibration analysis are discussed based on a simplified, roll-plane half-car model. A finite-elementmethod-based approddach for modelling the transient dynamics of an HIS vehicle is also briefly outlined. In addition, recent work on the investigation of NVH associated with HIS-equipped vehicles is mentioned. Discussion is then provided on future work to the further understanding of HIS and its applications. The paper concludes that interconnected suspension schemes can provide much greater flexibility to independently specify modal stiffness and damping parameters -a characteristic unique among passive suspensions. It points out that there is a need for system optimisation, and there are troublesome NVH issues that require solutions. It suggests that further research attention and effort be paid to NVH issues and system level optimisation to gain a greater understanding of HIS and to broaden its applications.

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An Experimental Examination of J-Turn and Fishhook Maneuvers That May Induce On-Road, Untripped, Light Vehicle Rollover

Cited by 44 publications

References 2 publications

Hydraulically interconnected vehicle suspension: handling performance

Hydraulically interconnected vehicle suspension: handling performance

Transient Characteristics of a Hydraulically Interconnected Suspension System

Recent developments in passive interconnected vehicle suspension

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