Bayes confidence limit for domestic drilling mud pump piston life was given. Maximum likelihood estimation of mud pump piston life was discussed under Weibull life distribution. For further, failure mechanism of the same batch mud pump piston was studied, the shape parameter of Weibull distribution was considered to be constant. Bayes point estimation and confidence limit of distribution parameters and mud pump piston life were given, according to field life data collected from Daqing oil field, under non-information priori and conjugate prior information for scale parameter. Example shows the effectiveness of the proposed method.
This paper proposes a recursive least squares algorithm for nonlinear systemswith piece-wise linearities. By using a switching function, themodel of the nonlinear systems be changed to anidentification model, then based on the derived model, a recursive least squares algorithm is provided to estimate all theunknown parameters of the systems. An example is provided to showthe effectiveness of the proposed algorithm.
According to the reliability assessment of the SnO2 gas sensor, an accelerate degradation model was established by using temperature as the accelerated stress, the constant stress accelerated degradation testing (CSADT) was designed and conducted. The reliability of SnO2 gas sensor under the normal stress level was assessed based on pseudo life.
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