Active Hydraulically Interconnected Suspension. Modelling and Simulation

Paper #:
  • 2017-01-1561

Published:
  • 2017-03-28
Abstract:
Rollover prevention is one of the prominent priorities in vehicle safety and handling control. A promising alternative for roll angle cancellation is the active hydraulically interconnected suspension. This paper represents the analytical model of active hydraulically interconnected suspension system followed by the general simulation. Passive hydraulically interconnected suspension systems have been widely discussed and studied up to now. This work specifically focuses on the active hydraulically interconnected suspension system. Equations of motion of the system are formalised first. The entire system consists of two separate systems that can be modelled independently and further combined together for simulation. One of the two systems is 4 degrees of freedom half-car model which simulates vehicle lateral dynamics and vehicle roll angle response to lateral acceleration in particular. The other system is active hydraulically interconnected suspension system which is responsible for active roll angle reduction. The systems are combined via hydraulics to mechanical boundary condition. The methodology used is based on obtaining the equations of motion for the hydraulically interconnected suspension system as well as the half-car model. Standard Lagrange method is used for the half-car model. Hydraulic impedance method and the Kirchhoff's laws for hydraulics are used for the hydraulic circuit. Under a certain simplification, the state-space model of the whole system can be obtained with all states measurable. In simulation part, the system response is examined with a number of typical input tests including NHTSA J-turn manoeuvre and NHSTA fishhook manoeuvre. The ability of the active system in roll angle reduction is compared with the conventional car suspension and passive hydraulically interconnected suspension system is demonstrated.
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