Optimal allocation of reliability improvement target based on multiple
correlation failures and risk uncertainty
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Publication date: 2023-01-27
Eksploatacja i Niezawodność – Maintenance and Reliability 2023;25(1):8
HIGHLIGHTS
- A risk assessment machinery is proposed under probability measure.
- The generalized risk models are established based on the cooperative game theory.
- A multi-objective optimal allocation model is presented for reliability improvement.
- The proposed method is more reasonable complete, and practical.
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ABSTRACT
Optimal allocation of the reliability improvement target is essential for
the system optimization design. In order to solve the problems that the
optimization model is with loss of generality and the validity of the
optimal solution is weakened, an optimal allocation method is proposed
by considering multiple correlation failures and risk uncertainty in this
paper. Two new concepts are presented, such as independent failure
results in basic risk, and correlation failure leads to disturbance risk.
A risk assessment machinery of “actual risk = basic risk + disturbance
risk” is proposed. The action mechanisms of the three correlation failures
are studied based on the cooperation game theory, and the generalized
risk models are given under probability measure. Considering the
improvement cost, the expectation and the variance of the reduction of
system risk, a multi-objective optimal allocation model is developed,
which is solved by using the PSO algorithm. Finally, the proposed
optimal allocation is implemented at the 2-stage NGW planetary reducer,
and the results show that it is more efficient and feasible for engineering
practice.