Probe on Network-Based Collaborative Maintenance Mode for After-Sales Equipment
Quantil-artige Ungleichungen für die Systemzuverlässigkeit
Random inspection schedules with non-decreasing intensity
Real time scheduling and routing for flexible manufacturing systems with unreliable machines
Reconfigurable control design with integration of a reference governor and reliability indicators
A new approach to manage actuator redundancy in the presence of faults is proposed based on reliability indicators and a reference governor. The aim is to preserve the health of the actuators and the availability of the system both in the nominal behavior and in the presence of actuator faults. The use of reference governor control allocation is a solution to distribute the control efforts among a redundant set of actuators. In a degraded situation, a reconfigured control allocation strategy is...
Régularité des matrices à diagonale dominante. Applications à l'absorption dans les chaînes et processus de Markov
Reliability Analysis of a Two-Unit Standby System by Computer Simulation
Reliability design of complex systems by minimizing the lifetime variance
The problem considered in this paper is the minimization of the lifetime variance of a complex system subject to its expected life and economic constraints. The example of a bridge network, in which all elements have constant failure rates, illustrates the problem. A numerical algorithm for solving this optimization problem by using exact formulae for system lifetime moments is included. Using this algorithm, we can obtain results better than the solutions known from earlier papers.
Reliability modeling of fault tolerant control systems
This paper proposes a novel approach to reliability evaluation for active Fault Tolerant Control Systems (FTCSs). By introducing a reliability index based on the control performance and hard deadline, a semi-Markov process model is proposed to describe system operation for reliability evaluation. The degraded performance of FTCSs in the presence of imperfect Fault Detection and Isolation (FDI) is reflected by semi-Markov states. The semi-Markov kernel, the key parameter of the process, is determined...
Reliability of communication networks with delay constraints: computational complexity and complete topologies.
Reliability of modules with load-sharing components.
Reliability of system with dependent units
The availability of a system with dependent units is obtained in the case where the system fails when one of the essential units fails. Markov model is assumed. The system considered consists of dependent units of which units are essential units. A unit is said to be essential if its failure causes the system to fail. The mean and variance of time to system failure are given. Unit reliability is also discussed.
Reliability with Preventive Maintenance.
Resource allocation in a mobile telephone network : a constructive repair algorithm
To cope with its development, a French operator of mobile telephone network must periodically plan the purchase and the installation of new hardware, in such a way that a hierarchy of constraints (required and preferred) is satisfied. This paper presents the “constructive repair” method we used to solve this problem within the allowed computing time (1 min). This method repairs the planning during its construction. A sequence of repair procedures is defined: if a given repair cannot be achieved...
Resource allocation in a mobile telephone network: A constructive repair algorithm
To cope with its development, a French operator of mobile telephone network must periodically plan the purchase and the installation of new hardware, in such a way that a hierarchy of constraints (required and preferred) is satisfied. This paper presents the “constructive repair” method we used to solve this problem within the allowed computing time (1 min). This method repairs the planning during its construction. A sequence of repair procedures is defined: if a given repair cannot be achieved...
Simulation of Machine Interference in Randomly Changing Environments
Single-use reliability computation of a semi-Markovian system
Markov chain usage models were successfully used to model systems and software. The most prominent approaches are the so-called failure state models Whittaker and Thomason (1994) and the arc-based Bayesian models Sayre and Poore (2000). In this paper we propose arc-based semi-Markov usage models to test systems. We extend previous studies that rely on the Markov chain assumption to the more general semi-Markovian setting. Among the obtained results we give a closed form representation of the first...
Some approximate inspection policies for a system with imperfect inspections
Some estimations of system reliability with positively dependent survival times of critical paths
Some examples of non-monotonicities in a two-unit redundant system
A cold-standby redundant sytem with two identical units and one repair facility is considered. Units can be in three states: good , degraded , and failed . It is supposed that only the following state-transitions of a unit are possible: , , , . The paper deals with the comparison of some initial situations of the system and with a stochastical improvement of units (stochastical increase of time of work in state and/or stochastical decrease of times of repairs of the types and/or ) and...