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Remaining useful life prediction of cylinder liner based on nonlinear degradation model

Kang Jianxiong, Lu Yanjun, Zhao Bin, Luo Hongbo, Meng Jiacheng, Zhang Yongfang

Eksploatacja i Niezawodność

2022

Vol. 24, no. 1

62--69

In order to effectively monitor the wear and predict the life of cylinder liner, a nonlinear degradation model with multi-source uncertainty based on Wiener process is established to evaluate the remaining useful life (RUL) of cylinder liner wear. Due to complex service performance of cylinder liner, the uncertainty of operational environment and working conditions of cylinder liner wear are considered into the model by a random function. The probability density function (PDF) formula of RUL is derived, and the maximum likelihood estimation method is adopted to estimate the unknown parameters of PDF. Considering the evaluated parameters as the initial values, the model parameters are updated adaptively, and an adaptive PDF is obtained. Furthermore, the proposed model is compared with two classical degradation models. The results show that the proposed model has a good performance for predicting the life, and the error is within 5%. The method can provide a reference for condition monitoring of cylinder liner wear.

Analytical assessments of selected main engine pistons drawing out records and record of cylinder oil feed rates

Kamiński W.

Zeszyty Naukowe / Akademia Morska w Szczecinie

2013

nr 36 (108) z. 2

56--60

The paper presents the analytical assessment of main engine piston drawing out records and record of cylinder oil feed rates. Collated and analyzed the wear records of cylinder liners and piston rings of main engines installed in three ships on the basis of the measurements at main engine piston drawing out measured during dry dock main engine overhauls. An analytical data have been taken from operating records. Author presents a summary of the results of these surveys and analytical assessments made for selected three vessels (VLCC) with Main Engines B&W Man MC series.