Investigation on Stability and Possible Chaotic Motions in the Controlled Wheel Suspension System

RESONANCES OF A NON-LINEAR s.d.o.f. SYSTEM WITH TWO TIME-DELAYS IN LINEAR FEEDBACK CONTROL

“…This system is related to the simplest model for many practical controlled systems, such as active vehicle suspension systems when the non-linearity in the tires is considered [8]. In equation (1), the damping, non-linearity and feedback gains are assumed to be small and of the same order.…”

Stability Switches of Time-Delayed Dynamic Systems With Unknown Parameters

“…The stability of these two models has been reported in a number of previous publications, but mainly limited to relatively simple cases. For example, the stability of an undamped quarter car model with active suspension was analyzed for a given time delay in reference [9] by using the D-subdivision method. For the quarter car model equipped with a passive damper and a &&sky-hook'' damper, the delay-independent stability was given in reference [1].…”

Aeroelasticity of 2-D lifting surfaces with time-delayed feedback control

“…Their implementation would enable to increase the flutter speed, enhance the aeroelastic response by attenuating excessive vibrations, and convert the unstable limit cycle oscillation (LCO), in which case the flutter boundary is catastrophic, into a stable LCO, in which case the flutter boundary is benign. One of the limitations of the performance of the active control consists of the presence of unavoidable time-delays in controller and actuators (Palkovics et al, 1992;Ramesh and Narayanan, 2001;. These delays can be detrimental in the sense of deteriorating the control performance, and even of precipitating the occurrence of the instability of the aeroelastic system.…”