Properties Analysis of Hydraulic PTO Output Fluctuation Regulating Based on Accumulator

IF 2.2 3区工程技术 Q2 ENGINEERING, MECHANICAL

Actuators Pub Date : 2024-07-11 DOI:10.3390/act13070261

Han Jia, Z. Pei, Zhiyong Tang, Meng Li

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Abstract

Hydraulic power take-off (PTO) is increasingly favored as energy regulation and transmission system in wave energy converters (WEC), significantly smoothing the inherent randomness and fluctuation of wave energy. This paper designed a novel hydraulic PTO system composition of a double-acting hydraulic cylinder pump and accumulators. The dynamic process sub-division principle in an operating period of the hydraulic cylinder pump and accumulator and the mathematical model for explaining the fluctuations of pressure and flow rate in the hydraulic pump and accumulator circuit by means of the sub-division principle are put forward. The MATLAB/Simulink simulation model used to analyze pressure fluctuation in the hydraulic PTO system is established based on the mathematical model. The numerical results and MATLAB simulation results are mutually verified about the fine analysis of the accumulator smoothing fluctuation in the hydraulic PTO system. The results show that the pressure fluctuation amplitude of a hydraulic circuit is negatively correlated with the accumulator pre-charge pressure and the accumulator volume, and is positively correlated with the operating period of a hydraulic pump. The energy transfer efficiency of the hydraulic PTO system with accumulator fine compensation can be above 90%. The theory and model in this paper will serve as a valuable reference for designing fluctuation compensation parameters in hydraulic systems.

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基于蓄能器的液压 PTO 输出波动调节性能分析

液压动力输出（PTO）作为波浪能转换器（WEC）的能量调节和传输系统越来越受到青睐，它能显著平滑波浪能固有的随机性和波动性。本文设计了一种由双作用液压缸泵和蓄能器组成的新型液压 PTO 系统。提出了液压缸泵和蓄能器在一个工作周期内的动态过程细分原理，以及利用细分原理解释液压泵和蓄能器回路中压力和流量波动的数学模型。根据数学模型建立了用于分析液压 PTO 系统压力波动的 MATLAB/Simulink 仿真模型。数值结果与 MATLAB 仿真结果相互验证了对液压 PTO 系统中蓄能器平滑波动的精细分析。结果表明，液压回路的压力波动幅度与蓄能器预充压力和蓄能器容积呈负相关，与液压泵的工作周期呈正相关。带蓄能器精细补偿的液压 PTO 系统的能量传递效率可达 90% 以上。本文的理论和模型将为设计液压系统的波动补偿参数提供有价值的参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Actuators Mathematics-Control and Optimization

CiteScore

3.90

自引率

15.40%

发文量

315

审稿时长

11 weeks

期刊介绍： Actuators (ISSN 2076-0825; CODEN: ACTUC3) is an international open access journal on the science and technology of actuators and control systems published quarterly online by MDPI.