Analysis of input delay systems using integral quadratic constraint

The L2-gain computation of a linear time-invariant system with state and input delay is discussed. The input and the state delay are handled separately by using dissipation inequality involving a Lyapunov-Krasovskii functional and integral quadratic constraints. A conic combination of IQCs is proposed for characterizing the input delay, where the coefficients are linear time-invariant systems. The numerical example (a vehicle platoon) confirm that using this dissipativity approach a more effective method for L2-gain computation is obtained

Uncertainty remodeling for robust control of linear time-invariant plants

The paper proposes a measure of robust performance based on frequency domain experimental data that allows non-conservative modeling of uncertainty. Given the nominal model of the plant and closed-loop performance specifications the iterative control design and remodeling of model uncertainty based on that measure leads to a controller with improved robust performance. The structured dynamic uncertainty is allowed to act on the nominal model in a linear fractional transformation (LFT) form. The proposed method is a modification of the structured singular value with implicit constraints on model consistency. The usefulness of the method is demonstrated on a vehicle control simulation example

Spectral analysis of suspension system of a commercial city bus

There is an ever increasing demand for intelligent and efficient urban vehicle systems that fulfill several requirements, e.g., low cost maintainability and high passenger comfort. Concerning these goals reliable methods are needed to model and to evaluate the imposed performances. In this paper a spectral analysis of the suspension system of a commercial city bus is presented. Based on experimental data taken on a city bus, the vibrations emerging on the wheels and the body are analyzed in the frequency domain. The goal of the analysis is to characterize the main eigenfrequencies of the suspension system and its damping in amplitude and also to evaluate both the road and the suspension system in terms of passenger comfort according to ISO standards. © 2016 IEEE

Experimental verification of vehicle platoon control algorithms

Organizing a group of vehicles into a vehicle platoon in a way that, except for the leading vehicle, each platoon member can be autonomously driven has been a research goal for decades. Among other benefits this results in a decrease of fuel consump- tion and also in the driver’s workload and an increase in a better use of road capacity. The recent developments in the area of ac- tive control systems for vehicles make it possible to realize more and more autonomous functions and the above defined cooper- ation between vehicles seems to be increasingly feasible. This article aims to point out that today it is possible to reach this goal without vehicle specific software and hardware