Audrey Rizzo

Improvement of hydractive suspension hard mode comfort thanks to a low frequency active CRONE system - Part 2: Control part and simulation results

This paper presents a control law for a low frequency active suspension system necessary for the implementation of the strategy defined in the first paper. The structure of the proposed control law is based on cooperation between feedforward and feedback. Feedforward design is based on the vehicle physics. The feedback law is synthesized from CRONE control-design method, french acronym of “Commande Robuste d’Ordre Non Entier” (non integer order robust control). Modeling, robust control-design in frequency-domain, optimal approach, stability analysis and performance are presented in this paper.Copyright

Electric CRONE Suspension

Abstract The aim of this paper is to adapt the CRONE (Non Integer Order of Robust Control) strategy to the electric suspension. This strategy allows not only to improve the comfort but also to assure the same car performance whatever the mass. Moreover thanks to the actuator of the Active Wheel systems this strategy can be applied to an active system which offers one bigger action spectrum for the suspension. Indeed this new compact system offers important opportunities in global chassis control.

A New CRONE Suspension: More Compact and More Efficient: Part 1—Problematics and Specifications

This paper presents, in 2 parts, a new CRONE suspension approach. The first part defines the problematics in suspension and gives the different conditions to overcome it. Then in the second paper a new CRONE suspension system is synthesized based on the conclusion of this paper. So, here, is presented how the variations of mass act on the classical suspension and how tools can be set up to simulate the influence of this variation without to choose the technological structure. Then a criterion on the level of wheel holding is established.Copyright

Improvement of hydractive suspension hard mode comfort thanks to a low frequency active CRONE system - Part 1: Problematic, Strategy and modelling

This paper presents, in 2 parts, a control law for a low frequency active suspension system. The first part, talks about the problematics, the strategy and the modelling. The control part and the results of the simulations are presented in the second part. More precisely, after the presentation of the problematics, the strategy which allows to get around the conflict of the passive suspensions is exposed in this first paper. Then, the hydropneumatic suspension which allows the implementation of this strategy is presented. It is composed of one hydractive part and one low frequency active part. Finally the validation and synthesis models are developed; their exploitation is made in the second paper.Copyright

A New CRONE Suspension: More Compact and More Efficient: Part 2—Synthesis and Achievement

In a vibration isolation context, fractional derivative can be used to design suspensions which allow to obtain similar performances in spite of parameters uncertainties. This paper presents the synthesis and the achievement of a new Hydractive CRONE suspension system. After the study of the different constraint in suspension in the first paper, the ideal transfer function of the hydractive CRONE suspension is created and simulated in different case. Then a method to determine the technological parameters is proposed. A parallel arrangement of dissipative and capacitive components and a gamma arrangement are compared. They lead to the same unusual performances: the stability degree robustness and the rapidity robustness.Copyright