Results from NHTSA's Experimental Examination of Selected Maneuvers that may Induce On-Road Untripped, Light Vehicle Rollover

Garrott, W. Riley; Howe, J. Gavin; Forkenbrock, Garrick

doi:10.4271/2001-01-0131

Cited by 22 publications

(20 citation statements)

References 3 publications

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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%

See 1 more Smart Citation

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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Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Transient Characteristics of a Hydraulically Interconnected Suspension System

Jeyakumaran¹,

Smith²,

Zhang³

2007

SAE Technical Paper Series

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show abstract

“…Two of untripped rollover propensity maneuvers are chosen to test the vehice fitted with DDAS, which are the J-turn maneuver and Fishhook maneuver [14]. The pneumatic cylinders roll the vehicle to simulate the rolling effects of vehicle's J-turn and Fishhook maneuvers on road, and the performance of DDAS is examed in both cases.…”

Section: B Test and Resultsmentioning

confidence: 99%

“…The Fishhook maneuver makes a large turn and then turns back in the opposite direction, which might happen when a driver performs a double lane change [14]. To simulate this maneuver, the pneumatic cylinders tilt the vehicle to one direction, then switch to another direction.…”

Section: ) Fishhook Maneuvermentioning

confidence: 99%

Design and experimental investigation of Demand Dependent Active Suspension for vehicle rollover control

Wang

Zhang

2009

Proceedings of the 48h IEEE Conference on Decision and Control (CDC) Held Jointly With 2009 28th Chinese Control Conference

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This paper presents a novel design for demand dependent active suspension (DDAS) focusing on vehicle rollover control. Active suspensions take credit for improving ride comfort and handling performance, but to use active suspension in vehicle rollover control has not been widely investigated. The proposed active suspension design consists of four double direction hydraulic actuators, hydraulically interconnected, and it can actively tilt the vehicle against its roll motion by supplying a required restoring moment, which is over the competence of passive or semi-active suspension. Based on a real vehicle fitted with DDAS, the experimental investigation validates the effectiveness of DDAS in vehicle rollover control. Abstract-This paper presents a novel design for Demand Dependent Active Suspension (DDAS) focusing on vehicle rollover control. Active suspensions take credit for improving ride comfort and handling performance, but to use active suspension in vehicle rollover control has not been widely investigated. The proposed active suspension design consists of four double direction hydraulic actuators, hydraulically interconnected, and it can actively tilt the vehicle against its roll motion by supplying a required restoring moment, which is over the competence of passive or semi-active suspension. Based on a real vehicle fitted with DDAS, the experimental investigation validates the effectiveness of DDAS in vehicle rollover control.

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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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Results from NHTSA's Experimental Examination of Selected Maneuvers that may Induce On-Road Untripped, Light Vehicle Rollover

Cited by 22 publications

References 3 publications

Transient Characteristics of a Hydraulically Interconnected Suspension System

Transient Characteristics of a Hydraulically Interconnected Suspension System

Design and experimental investigation of Demand Dependent Active Suspension for vehicle rollover control

Recent developments in passive interconnected vehicle suspension

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