Based on the range of supply interruption the proposed model generates variable set,and takes the minimum deviation from the due maintenance time of equipments and most reasonable distribution of workload as objective function,then by use of chaos particle swarm optimization(CPSO) the model is solved.

A new approach of reliability-based optimization of structures with the mixture of fuzzy and interval variables is presented.

When the fuzziness of the interval parameters was represented by the interval-valued membership function,the uncertainty of the interval variables was represented by fuzzy interval factors,and the interval variables were expressed as the product of their mean values and interval factors.

Reliability analysis of response surface method based on interval variables;

Uncertainties of parameters in control systems were described by interval variables, and some idea of the non-probabilistic reliability method that we proposed in previous papers were used for the delay stability analysis of uncertain systems.