Ferdinand Svaricek

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Recently, the concept of strong structural controllability has attracted renewed attention. In this context the existing literature to strong structural controllability has been revisited and some of the previous results have been found to be incorrect. Therefore, in this paper an overview of the previous results on strong structural controllability,(More)
We extend earlier characterizations of strong structural controllability of linear systems depending on parameters to the time-varying case x(t+1) = At ·x(t)+Bt ·u(t). Our main result is that the time-varying system is strongly structurally controllable iff the corresponding time-invariant system (whose matrices have the same zero-nonzero structure) is so.(More)
In this paper, we extend the notion of strong structural controllability of linear time-invariant systems, a property that requires the controllability of each system in a specific class given by the zero-nonzero pattern of the system matrices, to the linear time-varying case ẋ(t) = A(t) · x(t) + B(t) · u(t), where A and B are matrices of analytic(More)
In this note we consider continuous-time systems ẋ(t) = A(t)x(t) + B(t)u(t), y(t) = C(t)x(t) + D(t)u(t) as well as discrete-time systems x(t + 1) = A(t)x(t) + B(t)u(t), y(t) = C(t)x(t) + D(t)u(t) whose coefficient matrices A, B, C and D are not exactly known. More precisely, all that is known about the systems is their nonzero pattern, i.e., the locations(More)
This paper proposes a tracking controller based on the concept of flat inputs and a dynamic compensator. Flat inputs represent a dual approach to flat outputs. In contrast to conventional flatness-based control design, the regulated output may be a non-flat output, or the system may be non-flat. The method is applicable to observable systems with stable(More)
This paper discusses the rapid controller prototyping approach used at Continental and the University of the German Armed Forces for the design and implementation of active vibration control systems. Continental has developed and implemented prototypes of active engine mounting systems on various test vehicles and demonstrated that significant reductions in(More)
The paper deals with two fundamentally different approaches for active control of engine-induced vibrations in automotive vehicles. On the one hand the well-known adaptive feedforward approach with a reference sensor is presented. On the other hand the use of feedback structures is also discussed. Both approaches for active vibration control have been(More)
Fuzzy controllers are used in many practical applications since they guarantee impressive robustness properties and the control design requires only simple rules which are based on heuristic knowledge. However, since the number of rules is increased with the number of control inputs and measurements the control design may become overloaded and the design(More)