Effect of Connecting the Front and Rear Air Suspensions of a Vehicle on the Transmissibility of Road Undulation Inputs

Front. Mech. Eng. China

2009

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.

Section: More Recent Proposalsmentioning

confidence: 99%

Recent developments in passive interconnected vehicle suspension

Smith

Front. Mech. Eng. China

2009

Vehicle System Dynamics

“…The schematics of [12] are found again in [13] both from the parameter optimization standpoint and to obtain experimental validation. [14] shows the case in which the role of an auxiliary reservoir is played by a second pneumatic spring located on a different vehicle axle, therefore connecting the springs on the front and rear axles by a pipe with a resistance [15] proposes an application of pneumatic suspensions with semi-active control on railway vehicles. The pneumatic suspension in [16] is ®tted with a self-energizing leveling device, so that the suspension does not have to be fed externally.…”

Section: Introductionmentioning

confidence: 99%

Air Suspension Dimensionless Analysis and Design Procedure

Quaglia¹,

Sorli²

2001

145

122

This article presents the dimensionless model and the design considerations of a pneumatic suspension with auxiliary reservoir. The dimensionless model provided makes it possible to fully understand the effect of the parameters which de®ne the suspension and to select the spring type correctly. Without this selection, the suspension generates transmissibility curves with excessive ampli®cation in the vicinity of the resonance, even after optimum de®nition of auxiliary volume and resistance. This aspect is the key point for de®ning effective applicable solutions. The design considerations provided at the end of the work constitute a useful re Âsume Â and a guide for designing suspensions of the type described.

“…In recent decades, many research efforts have been focused upon using interconnected suspension systems [16,17]. Behave [18] developed a parametric study of the influence of pneumatic pitch-plane interconnection arrangements on vehicle ride performance. Yao et al [19] designed a novel dual-mode interconnected suspension to optimize conflicting vehicle performance requirements by switching different modes.…”

Section: Introductionmentioning

confidence: 99%

Vibration Performance Analysis of a Mining Vehicle with Bounce and Pitch Tuned Hydraulically Interconnected Suspension

Deng

et al. 2019

Chin. J. Mech. Eng.

The current investigations primarily focus on using advanced suspensions to overcome the tradeoff design of ride comfort and handling performance for mining vehicles. It is generally realized by adjusting spring stiffness or damping parameters through active control methods. However, some drawbacks regarding control complexity and uncertain reliability are inevitable for these advanced suspensions. Herein, a novel passive hydraulically interconnected suspension (HIS) system is proposed to achieve an improved ride-handling compromise of mining vehicles. A lumped-mass vehicle model involved with a mechanical-hydraulic coupled system is developed by applying the free-body diagram method. The transfer matrix method is used to derive the impedance of the hydraulic system, and the impedance is integrated to form the equation of motions for a mechanical-hydraulic coupled system. The modal analysis method is employed to obtain the free vibration transmissibilities and force vibration responses under different road excitations. A series of frequency characteristic analyses are presented to evaluate the isolation vibration performance between the mining vehicles with the proposed HIS and the conventional suspension. The analysis results prove that the proposed HIS system can effectively suppress the pitch motion of sprung mass to guarantee the handling performance, and favorably provide soft bounce stiffness to improve the ride comfort. The distribution of dynamic forces between the front and rear wheels is more reasonable, and the vibration decay rate of sprung mass is increased effectively. This research proposes a new suspension design method that can achieve the enhanced cooperative control of bounce and pitch motion modes to improve the ride comfort and handling performance of mining vehicles as an effective passive suspension system. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.