Abstract
Although some reliability importance measures and maintenance policies for mechanical products exist in literature, they are rarely investigated with reference to weakest component identification in the design stage and preventive maintenance interval during the life cycle. This paper is mainly study reliability importance measures considering performance and costs (RIMPC) of maintenance and downtime of the mechanical hydraulic system (MHS) for hydraulic excavators (HE) with energy regeneration and recovery system (ERRS) and suggests the scheduled maintenance interval for key components and the system itself based on the reliability R i t . In the research, the required failure data for reliability analysis is collected from maintenance crews and users over three years of a certain type of hydraulic excavators. Minitab is used for probable distribution estimation of the mechanical hydraulic system failure times, and the model is verified to obey Weibull distribution. RIMPC is calculated by multiplying the reliability R i t and weighting factor W i and then compared with other classical importance measures. The purpose of this paper is to identify the weakest component for MHS in the design stage and to make appropriate maintenance strategies which help to maintain a high reliability level for MHS. The proposed method also provides the scientific maintenance suggestion for improving the MHS reliability of the HE reasonably, which is efficient, profitable, and organized.
Highlights
With development of society and the progress of science and technology, crisis of lack of energy and serious environmental pollution has become increasingly prominent
This paper mainly discusses the reliability importance measures considering performance and costs (RIMPC)
The proposed method is verified by the type of mechanical hydraulic system (MHS) with energy regeneration and recovery system (ERRS) which belongs to 30 Ton hydraulic excavators (HE)
Summary
With development of society and the progress of science and technology, crisis of lack of energy and serious environmental pollution has become increasingly prominent. Pollution reduction, and sustainable development, various energy-saving technologies have been applied in construct machinery, such as hybrid, energy recovery, electronic control, and new energies. The favorite for customers and manufacturers is energy recovery technology, for its low cost and high production efficiency. The hydraulic system of construction machines become more complicated when upgraded with energy recovery unit; quality and reliability analyses for complex hydraulic system become the most important task in the stages of design, running, and maintenance. The preventive maintenance policies or replacement scheme can be performed in right time by means of important measures analysis, which could ensure system operated normally
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