Abstract
In the marine industry, heave compensation systems are applied to marine equipment to compensate for the adverse effects of waves and the hydraulic system is usually used as the power system of heave compensation systems. This article introduces importance theory to the opportunistic maintenance (OM) strategy to provide guidance for the maintenance of heave compensation systems. The working principle of a semi-active heave compensation system and the specific working states of its hydraulic components are also first explained. Opportunistic maintenance is applied to the semi-active heave compensation system. Moreover, the joint integrated importance measure (JIIM) between different components at different moments is analyzed and used as the basis for the selection of components on which to perform PM, with the ultimate goal of delaying the degradation of the expected performance of the system. Finally, compared with conditional marginal reliability importance (CMRI)-based OM, the effectiveness of JIIM-based OM is verified by the Monte Carlo method.
Highlights
Heave compensation systems keep offshore operation platforms stable via active or passive compensation, thereby overcoming the adverse effects of sea wind, waves, ocean currents, etc., on offshore operations [6, 12]
Linear heave compensation systems have the advantages of high control accuracy and the convenient combination of active and passive control, but the compensation stroke is limited by the stroke of the hydraulic cylinder
joint integrated importance measure (JIIM)-based opportunistic maintenance (OM) was applied to the maintenance of a semi-active heave compensation system to slow down the degradation of expected system performance
Summary
Heave compensation systems keep offshore operation platforms stable via active or passive compensation, thereby overcoming the adverse effects of sea wind, waves, ocean currents, etc., on offshore operations [6, 12]. Maintenance strategy models and their optimization have always been an important branch of reliability engineering. Dui et al proposed a cost-based integrated importance measure to select the component or group of components for PM [8]. Wu proposed joint reliability importance measures to evaluate how two components interactively contribute to system performance, which guides the selection of another component for maintenance [29]. Dui et al proposed the extended joint integrated importance measure (JIIM) to select components for PM to optimally improve the system performance [7]. A maintenance model for the hydraulic system of the heave compensation system is presented based on the JIIM. Opportunistic maintenance strategies based on JIIM can provide faster and simpler component maintenance selection guidance for heave compensation systems.
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