Hierarchical dispersion entropy and its application in fault diagnosis of high pressure common rail injectors

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (2) : 72-80.

KE Yun，SONG Enzhe，YAO Chong，DONG Quan，YANG Liping

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Abstract

With the rapid development of nonlinear scientific theory, the information entropy method has been widely used in fault diagnosis of engineering machinery.In the paper, hierarchical dispersion entropy (HDE) based on the combination of analytic hierarchy process and dispersion entropy was proposed and the influence of parameter variation on the calculation accuracy and computational efficiency of the entropy value was studied.The comparison of HDE with MSE, MFE, MDE, HSE and HFE was carried out, and the results show that the robustness and computational efficiency of HDE have certain advantages.By virtue of the advantages of HDE and the feature selection method PWFP, a fault diagnosis method for high pressure common rail injectors based on HDE and PWFP was proposed.The fuel pressure wave data of a common rail diesel engine were analyzed, and the method of PWFP combined with MSE, MFE, MDE, HSE or HFE was also tried.It is shown that compared with the existing information entropy fault diagnosis method, the fault diagnosis method based on hierarchical dispersion entropy and PWFP proposed in the paper has higher fault recognition rate and calculation effectiveness.

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hierarchical entropy / dispersion entropy / hierarchical dispersion entropy(HDE) / high pressure common rail injector / fault diagnosis

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KE Yun，SONG Enzhe，YAO Chong，DONG Quan，YANG Liping. Hierarchical dispersion entropy and its application in fault diagnosis of high pressure common rail injectors[J]. Journal of Vibration and Shock, 2021, 40(2): 72-80

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