Numerical Modeling of Wear Damage in Seals of a Wave Energy Converter with Hydraulic Power Take-Off under Random Loads

作者：Yang Limin^*; Moan Torgeir

来源：Tribology Transactions, 2011, 54(1): 44-56.

DOI：10.1080/10402004.2010.518340

• Abrasive Wear
• Piston Rings
• Dynamic Modeling
• Wave Energy Converter
• Hydraulic Power Take-Off
• Irregular Wave
• Wear Work Rate
• Short-Term Damage
• Long-Term Damage

Understanding and managing the safety and reliability issues of ocean energy converters is a key factor in the development of viable technologies. The present article deals with wear in the high-pressure hydraulic power take-off machinery in a heaving-buoy wave energy converter. In this study, an abrasive wear model for such machinery is developed for the steady-state operation by considering the effects of sealed pressure, relative velocity, material properties, time-varying environmental conditions, and lubrication, with a focus on the piston ring. In particular, the dependence of the wear damage on the sea state condition is investigated. The dynamic parameter named instantaneous wear work rate (Load x Velocity) is numerically calculated in the time domain. An estimate of the average wear work rate in each sea state is computed on the basis of a wave scatter table (significant wave heights versus peak period). Long-term wear damage can then be accounted for by summing up the short-term wear damage multiplied with the occurrence probability of each sea state. Finally, the relative contribution of wear damage from different sea states is obtained.

• 出版日期2011