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Reliability assessment for micro inertial measurement unit based on accelerated degradation data and copula theory
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Online publication date: 2022-06-29
Publication date: 2022-06-29
Eksploatacja i Niezawodność – Maintenance and Reliability 2022;24(3):554–563
  • The reliability evaluation of MIMU is carried out by using accelerated degradation test.
  • The MIMU’s marginal ADT model is obtained by the general Wiener process.
  • A multivariate-dependent ADT model of MIMU is established based on copula theory.
  • Sufficient experiments and result analysis verify the effectiveness of proposed methods.
With its extensive use in industry, assessing the reliability of the micro inertial measurment unit (MIMU) has become a pressing need. Unfortunately, the MIMU is made up of several components, and the degradation processes of each are intertwined, making it difficult to assess the MIMU’s reliability and remaining useful life. In this research, we offer a reliability assessment approach for the MIMU, which has long-lifetime and multiple performance characteristics (PCs), based on accelerated degradation data and copula theory.Each PC model of MIMU is constructed utilizing drift Brownian motion to depict accelerated degradation process. The copula function is used to model the multivariate dependent accelerated degradation test data and to describe the dependency between multiple MIMU performance parameters. The particle swarm optimization algorithm is used to estimate the unknown parameters in the multi-dependent ADT model. Finally, the storage test and simulation example on MIMU’s accelerated degradation data verify the feasibility and effectiveness of the proposed method.