This paper considers actuator redundancy management for a class of overactuated nonlinear systems. Two tools for distributing the control effort among a redundant set of actuators are optimal control design and control allocation. In this paper, we investigate the relationship between these two design tools when the performance indexes are quadratic in the control input. We show that for a part...

When designing control laws for systems with more inputs than controlled variables, one issue to consider is how to deal with actuator redundancy. Two tools for distributing the control effort among a redundant set of actuators are control allocation and linear quadratic control design. In this paper, we investigate the relationship between these two design tools when a quadratic performance in...

In this paper, we treat the problem of stochastic comparison of standby [active] redundancy at component level versus system level. In the case of standby redundancy, we present some interesting comparison results of both series systems and parallel systems in the sense of various stochastic orderings for both the matching spares case and non-matching spares case, respectively. In the case of a...

Components in cold-standby state are usually assumed to be as good as new when they are activated. However, even in a standby environment, the components will suffer from performance degradation. This article presents a study of a redundancy allocation problem (RAP) for cold-standby systems with degrading components. The objective of the RAP is to determine an optimal design configuration of co...

In [1] we proposed a balanced Multiple Description Coding (MDC) scheme based on the Discrete Wavelet Transform (DWT). This MDC includes an efficient bit allocation procedure that dispatches the source image redundancy between different channels. The amount of redundancy is controlled according to the Bit Error Rate of the different channels. Here, we propose to extend this approach for low bit ...

A new column generation decomposition algorithm is described and demonstrated to determine efficient solutions for the reliability-redundancy allocation problem. The problem is a well-known nonlinear mixed integer programming problem which involves the maximization of system reliability by simultaneously selecting component reliability levels and redundancy levels as part of systems engineering...

This paper interests to the redundancy management of the over-actuated control systems. A new approach to manage the actuator redundancy, for the control allocation compared to the LQ method is proposed based on the reliability analysis. The aim is to preserve the health of the actuators and the availability of the system. The desired efforts and the control inputs are distributed and generated...

This work presents a methodology to assess maintenance teams in the determination of the degree of redundancy that an active component must have in order to minimize its system life-cycle cost and in the definition of the corresponding maintenance plan schedule. The minimal required data are three average costs and one reliability function. It is useful in a system’s design phase, since in this...

Redundancy allocation problems (RAPs) have attracted much attention for the past thirty years due to its wide applications in improving the reliability of various engineering systems. Since RAP is an NP-hard problem and exact methods are only applicable to small instances, various heuristic and meta-heuristic methods have been proposed to solve it. In the literature, most studies on RAPs have b...

Will the fact that a person is selected among others on the basis of personal information affect that person’s behavior? In our experiment participants first answer a personality questionnaire. They then play a 3-person game: one of the three players decides, after inspecting the personality questionnaires, between an outside option and granting allocation power over a pie to one of the other t...