水力机械
液压蓄能器
执行机构
累加器(密码学)
变压器
液压泵
液压缸
汽车工程
储能
扭矩
工程类
电容器
计算机科学
控制理论(社会学)
控制工程
电气工程
机械工程
功率(物理)
电压
控制(管理)
物理
热力学
人工智能
量子力学
算法
作者
Lasse Schmidt,Søren Ketelsen,Robin Mommers,Peter Achten
标识
DOI:10.1115/fpmc2020-2719
摘要
Abstract The increasing focus on energy efficient systems and energy recuperation functionalities calls for multi actuator hydraulic systems to be tightly integrated with regards to energy distribution. Such systems need to allow power to pass back and forth between loads and the supply, while also enabling the ability to store energy. Here two approaches are obvious; namely the usage of hydraulic transformers interconnected via common pressure rails containing accumulators, and variable-speed pumps interconnected via a common electric dc-bus containing capacitors and/or batteries, both having the potential for energy storage and power sharing. A main question is when to apply which of these technologies, when considering specific requirements to actuator dynamics and control features. This paper presents an investigation into the analogy between hydraulic transformers and variable-speed pumps. The investigation takes offset in model based analyses of these technologies regarding their actuation dynamics related to torque generation, input-to-output pressure dynamics with and without a cylinder load. Finally a numerical study is presented, verifying and comparing their transient characteristics and energy losses. It is found that, disregarding the conventional speed control loop in variable-speed pumps, these are in fact equivalent with hydraulic transformers regarding secondary control abilities, dynamics and energy recovery, wheres hydraulic transformers generally must be expected to be more efficient than variable-speed pumps.
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