Modal and Dynamic Analysis of a Vehicle with Kinetic Dynamic Suspension System

Intl J Robust & Nonlinear

et al. 2020

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A mode decoupling control strategy is proposed for the active Kinetic Dynamic Suspension Systems (KDSS) with electrohydrostatic actuator (EHA) to improve the roll and warp mode performances. A matrix transfer method is employed to derive the modes of body and wheel station motions for full vehicle with active KDSS. The additional mode stiffness produced by the active KDSS is obtained and quantitatively described with the typical physical parameters. A new hierarchical feedback control strategy is proposed for the active KDSS to improve the roll and warp motion performances and simultaneously accounting for nonlinear dynamics of the actuators with hydraulic uncertainties. H∞ static output-feedback control is employed to obtain the desirable mode forces, and a new projection-based adaptive backstepping sliding mode tracking controller is designed for EHA to deal with address the nonlinearity and parameters uncertainty. This controller is used to realize the desirable pressure difference of EHA required from the target mode forces. Numerical simulations are presented to compare the roll and warp performances between the active KDSS, conventional spring-damper suspension, and suspension with antiroll bar under typical excitation conditions. The evaluation indices are normalized and compared with radar chart. The obtained results illustrate that the proposed active KDSS with proposed controller does not produce additional warp motion for vehicle body, and has achieved more reasonable tire force distribution among wheel stations, the roll stability, road holding, and significantly improved ride comfort simultaneously.

Section: Active Kdss Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Robust adaptive backstepping sliding mode control for motion mode decoupling of two‐axle vehicles with active kinetic dynamic suspension systems

Ding

Intl J Robust & Nonlinear

et al. 2020

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“…22 , 23 The conventional suspension (CS) with anti-roll bars (ARBs) can improve the roll stability, while the ride comfort would be deteriorated as well. 24 Some advanced passive suspension systems also have been reported to enhance overall performance for both handling and ride comfort. Wu and Zhang 25 presented a kinetic dynamic suspension system which can improve handling and road holding.…”

Section: Introductionmentioning

confidence: 99%

Improvement of ride quality for patient lying in ambulance with a new hydro-pneumatic suspension

Tan

Advances in Mechanical Engineering

et al. 2019

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Instability caused by emergency braking and steering during ambulance operation would easily lead to a sharp rise of blood pressure in patient's head, which would further cause a secondary injury to the patient. Furthermore, the vibration generated by uneven road would result in patient's nausea and deterioration of patient's condition. This article proposes a pitch-roll-interconnected hydro-pneumatic suspension system which can achieve the resistance control for pitch, roll, and bounce modes of ambulances to improve the stability and attenuate the vibration for the lying patients. The ambulance with pitch-roll-interconnected hydro-pneumatic suspension is characterized by 7 degrees of freedom dynamic model, in which the characteristics of pitch-roll-interconnected hydro-pneumatic suspension are explicitly formulized using hydrodynamic equation derivation. A motion-mode energy spectral density method is proposed to decouple the vibration energy for bounce, pitch, and roll modes in frequency domain. Subsequently, the parameter design approach incorporated with the suspension characteristic equations and motion-mode energy spectral density method is also presented to optimize the lying patient's ride comfort and ambulance's handling stability. The numerical simulation results show that the proposed pitch-roll-interconnected hydro-pneumatic suspension system can simultaneously provide pitch-roll-stiffness and damping without generating additional bounce-stiffness, resulting in superior ride comfort and handling stability compared to the conventional suspension.

“…Thus, this anti-oppositional mechanism is unable to balance the contradiction between the roll and warp motions of vehicles. 9…”

Section: Introductionmentioning

confidence: 99%

“…Thus, this anti-oppositional mechanism is unable to balance the contradiction between the roll and warp motions of vehicles. 9 To achieve further modal decoupling, a variety of novel interconnection arrangements, encompassing all four wheel stations either mechanically or hydraulically, have been carried out. Balanced suspension, a mechanical interconnected suspension, was firstly introduced by Zapletal 10,11 in 2000, based on a series of similar interconnected arrangements presented by Ortiz 12 in the 1990s.…”

Section: Introductionmentioning

confidence: 99%

Modeling and performance analysis of a vehicle with kinetic dynamic suspension system

Proceedings of the Institution of Mechanical Engineers, Part D:

et al. 2018

This paper presents a kinetic dynamic suspension (KDS) system to achieve enhanced cooperative control of the roll and warp motion modes for on-road and off-road sports utility vehicles (SUV). The proposed KDS system consists of two hydraulic circuits acting on two pairs of torsional rods and levers, which can be treated as novel anti-roll bars. Hence, these anti-roll bars do not work independently, but are coupled to merely respond to particular motion modes. To verify the handling and ride performance of the system, a 14-DOF model of a SUV and a “magic formula” tire model are developed. The dynamic responses of the vehicle model with KDS suspension are obtained through half-sine bump, asynchronous sine road, and fishhook maneuver simulations. The responses of the KDS equipped vehicle are compared to those of one with anti-roll bars to demonstrate its improved performance and also illustrate the side-effects. The results show that the KDS system considerably improves the vehicle’s anti-roll ability. Furthermore, the vehicle’s warp stiffness is significantly reduced by the KDS system, which enhances the vertical load distribution of each wheel when driving off-road.