A Precision Reliability Evaluation Model for Multi-Units Chained System Based on Correlation Analysis of Units  
Author Hongwei Wang


Co-Author(s) Jiawei Xiang


Abstract Mechanical systems are usually composed of multiple motion pairs. The current precision reliability evaluation methods mainly focus on the analysis of error sources, ignoring the correlation between moving components, which will lead to unsatisfactory results. Therefore, we apply the Function-Motion- Action structural decomposition method to express the mechanical system as a chain transmission structure composed by multiple Meta-Action Units (MAUs), and provide a new precision reliability evaluation method based on the correlation analysis of intra-MAU and inter-MAU. Firstly, the precision representation model is developed to determine the performance state distribution parameters of each MAU. The precision reliability of intra-MAU is evaluated based on stochastic process discretization. Secondly, the conditional random field model is adopted to obtain the joint probability density function of two adjacent MAUs. The mechanical system is analyzed layer by layer and the precision reliability is comprehensively evaluated according to the transmission direction of power. Finally, the methodology is applied to a numerical control rotary table to verify its performance.


Keywords Mechanical system, Meta-Action Unit, Precision reliability evaluation, Correlation analysis, Conditional random field
    Article #:  RQD28-379

Proceedings of 28th ISSAT International Conference on Reliability & Quality in Design
August 3-5, 2023