Pressure matching of wave energy device based on digital hydraulic cylinder group

doi:10.3785/j.issn.1008-973X.2019.10.006

Journal of ZheJiang University (Engineering Science)

2019, Vol. 53

Issue (10): 1892-1897 DOI: 10.3785/j.issn.1008-973X.2019.10.006

Mechanical and Energy Engineering

Pressure matching of wave energy device based on digital hydraulic cylinder group

Yong-gang LIN(

),Jian-qiang XU,Hong-wei LIU,Wei LI

State Key Laboratory of Fluid Power Transmission and Mechatronic System, Zhejiang University, Hangzhou 310027, China

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Abstract

A new digital hydraulic cylinder group was proposed to replace traditional hydraulic cylinder in order to solve the pressure distribution imbalance among different hydraulic branches when the hydraulic oil of distributed wave energy conversion systems collected together. The proposed hydraulic cylinder group consisted of several cylinders with different piston areas and the number of the connected cylinders was controlled by high-speed switching valves, which meant that different hydraulic branches’ pressures could be controlled to reach pressure balance among them. The modeling simulation and semi-hydraulic experiment results show that the distributed wave energy convertor systems based on digital hydraulic cylinder group can effectively reduce the pressure imbalance among different wave forced hydraulic branches compared with those based on traditional hydraulic cylinder. All different flaps of different branches can absorb wave energy to drive the hydraulic motor to run steadily.

Key words： wave energy oscillating surge wave energy convertor digital hydraulic cylinder group distributed energy capture integrated power generation

Received: 26 August 2018 Published: 30 September 2019

CLC:

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	Yong-gang LIN
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Cite this article:

Yong-gang LIN,Jian-qiang XU,Hong-wei LIU,Wei LI. Pressure matching of wave energy device based on digital hydraulic cylinder group. Journal of ZheJiang University (Engineering Science), 2019, 53(10): 1892-1897.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.10.006 OR http://www.zjujournals.com/eng/Y2019/V53/I10/1892

基于数字液压缸组的波浪能装置压力匹配

为了解决分布式波浪能装置液压传动系统中不同支路液压油汇集时的压力不均衡问题，提出新型的数字液压缸组以替代常规的液压缸. 该液压缸组由多个面积不同的液压缸组成，由高速开关阀控制液压缸组切入传动系统的液压缸数目，这意味着可以控制不同液压支路的压力以实现不同支路之间的压力匹配. 通过建模仿真和半物理试验表明，与基于传统的液压缸的分布式波浪能装置相比，基于数字液压缸组的分布式波浪能装置能够有效减少在不同波浪载荷作用下的不同液压支路的压力不平衡，系统中不同浮力摆均能够吸收波浪能对外做功，驱动液压马达稳定持续运行.

关键词： 波浪能, 浮力摆波浪能发电装置, 数字液压缸组, 分布式捕能, 集中发电

Fig.1 Schematic of digital hydraulic cylinder group

Tab.1 Coding numbers of digital hydraulic cylinder under different situations

Fig.2 Schematic of distributed wave energy capture and integrated power generation

Fig.3 Simulation model of digital hydraulic cylinder group and power generation system

Fig.4 Structural dynamics analysis of oscillating surge wave energy convertor

Fig.5 Simulated wave force on flap of oscillating surge wave energy convertor

Fig.6 Comparison of simulation results under different control strategies

Fig.7 Schematic and setup of semi-physical system

Fig.8 Curve of semi-physical experiments


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