Three-Parameter Bounded Intensity Process Model and Its Application in Reliability Assessment of NC Machine Tools[J]. 2014, 48(5): 107-112.
DOI:
Three-Parameter Bounded Intensity Process Model and Its Application in Reliability Assessment of NC Machine Tools[J]. 2014, 48(5): 107-112.DOI: 10.7652/xjtuxb201405019.
Three-Parameter Bounded Intensity Process Model and Its Application in Reliability Assessment of NC Machine Tools
To improve the reliability assessment accuracy of NC machine tools
a three-parameter bounded intensity process(3-BIP)model by intensity function with non-zero initial condition is proposed. The characteristic of the model is confirmed by differentiating with respect to the failure intensity function
and the relationship between the three-parameter bounded intensity process and the homogenous Poisson process is derived. The calculating formula for model parameters and reliability indexes are deduced by the maximum likelihood estimation and optimization. Two examples of the failure truncated data from single NC machine tool and the time truncated data from multiple NC machine tools are taken respectively to verify the proposed method. The results of log-likelihood function and goodness-of-fit show that the 3-BIP model is better than the BIP model
so the 3-BIP model accords with practical engineering well and provides a theoretical basis for making a reasonable maintenance strategy.
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