Optimal Design of Wave Power Generating Device Based on a Parallel Mechanism with 3-RPS/3-SPS Redundant Link

doi:10.3901/JME.2019.23.093

Abstract

Abstract: A kind of 3-RPS/3-SPS parallel mechanism with redundant link is proposed, then a novel wave power generating device has been designed based on this mechanism. The kinematic model of floater under the action of wave has been analyzed to set up coupled motion equation, then the hydrodynamic coefficient is calculated by using of strip theory. It has been proved through analysis of the relationship between energy acquisition efficiency and size of floater that the wave energy efficiency has the highest value when the diameter of floater is 6 m. The velocity mapping relationship between 3-RPS/3-SPS link and end-effector have been established. The force analysis of hydraulic cylinder is conducted to obtain the equivalent viscous damping coefficient, and then the modified motion equations of floater have been established. This method is also applicable to other wave power generating devices based on parallel mechanism. The performance evaluation indexes of effective workspace and global kinematics, the output power index of mechanism have been defined together, then the distribution of these indexes in workspace is given. The multi-objective optimization design of wave power generating device based on performance evaluation indexes have been conducted, and a group of optimized geometric parameters are given. The optimization result shows that the performances of workspace, kinematics and output power have been improved in varying degrees when mechanism parameters R=5 m, r=2 m. This study provides the theories foundations for the development and applications of wave power generating device.

Key words: wave power generation, parallel mechanism, floating body movement, workspace, dimension optimization

CLC Number:

P7
TP242

ZHAO Yuming, JIN Zhenlin. Optimal Design of Wave Power Generating Device Based on a Parallel Mechanism with 3-RPS/3-SPS Redundant Link[J]. Journal of Mechanical Engineering, 2019, 55(23): 93-102.

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