A new load-share reliability model of systems under the changeable load is proposed in the paper. It is assumed that the load\nis a piecewise smooth function which can be regarded as an extension of the piecewise constant and continuous functions. The\ncondition of the residual lifetime conservation, which means continuity of a cumulative distribution function of time to failure,\nis accepted in the proposed model. A general algorithm for computing reliability measures is provided. Simple expressions for\ndetermining the survivor functions under assumption of the Weibull probability distribution of time to failure are given. Various\nnumerical examples illustrate the proposed model by different forms of the system load and different probability distributions of\ntime to failure.
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