CONTINUOUS AND DISCRETE SLIDING MODE CONTROL OF AN ACTIVE CAR SUSPENSION SYSTEM

In this paper, sliding mode control (SMC) algorithms are tested for their use in an active car suspension system. Using the quarter model of the car as an example, the comparison of the efficiency of the algorithms is made. A continuous and two discrete versions of the sliding mode control are taken into consideration. The study is limited to finding the relation between the control parameters and the comfort factor. This is done by analyzing the response of the model to the harmonic and impulse excitation

Comparison of different control strategy in semi-active vehicle suspension system

This paper examined the quarter model of the vehicle suspension with dampers, represented by the hystereses models of Spencer type. The effectiveness of vibration reduction through the use of semi-active and passive systems with asymmetric damping force characteristics was compared. In case of semi-active dampers several different control algorithms of on-off type were considered. The impact of these algorithms on parameters associated with comfort and safety of the drive was analyzed. The results of the numerical simulations were presented in the form of graphs showing the values of performance indicators in the frequency domain

VIBRATIONS OF STEEL PIPES AND FLEXIBLE HOSES INDUCED BY PERIODICALLY VARIABLE FLUID FLOW

This paper is concerned with the analysis ofa model describing the vibrations of simply supported straight pipes conveying periodically pulsating fluid. The vibrations of the hydraulic system are described by a fourth-order partial diflerential equation, with the inclusion of geometrical non-linearities. Through the application of the Galerkin method, the non-linear problem is reduced to the solution of’/our ordinary differential equations. The influence of several significant parameters of the model on the rms value of velocity is investigated. The possibility ofexciting sub-harmonic and chaotic excitations at certain intervals ofcxcitation frequency andflow velocity is presented