A novel architecture of electro-hydrostatic actuator with digital distribution

Yao, Jianyong; Wang, Pei; Dong, Zhaosheng; Jiang, Dongting; Tong, Sha

doi:10.1016/j.cja.2020.08.012

Cited by 26 publications

(8 citation statements)

References 27 publications

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“…Hydraulic cylinder power loss is divided into leakage loss and mechanical friction loss. The hydraulic cylinder leakage amount could be shown as Equation (28):…”

Section: Hydraulic Cylinder Power Lossmentioning

confidence: 99%

Multi-Objective Optimization of Kinetic Characteristics for the LBPRM-EHSPCS System

Zhang,

Chen,

Yan

et al. 2023

Processes

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As the ‘heart’ of energy vehicles, the lithium-ion battery is in desperate need of precision improvement, green production, and cost reduction. To achieve this goal, the electro-hydraulic servo pump control system (EHSPCS) is applied to the lithium-ion battery pole rolling mill (LBPRM). However, this development can lead to limited dynamic performance and large power loss as a result of the EHSPCS unique volume direct-drive control mode. At present, how to solve this conflict has not been studied and how the EHSPCS component parameters influence the dynamic response, power loss, and economic performance is not clear. In this paper, a multi-objective optimization (MOO) model for the LBPRM-EHSPCS is proposed by comprehensively considering the dynamic, efficiency, and economic characteristics. Firstly, the evaluation model of the dynamic response, power loss, and cost is investigated. Then, the NSGA-II algorithm is introduced to address the Pareto front of the MOO model. Finally, the power loss and dynamic response of the LBPRM-EHSPCS before and after optimization are tested to validate the viability of the raised method. Results indicate that power loss is decreased by as much as 7.2% while steady-state precision is greatly improved after optimization. The proposed framework enhances the performance in lithium-ion battery manufacturing and can be applied to other kinds of hydraulic systems.

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“…Hydraulic cylinder power loss is divided into leakage loss and mechanical friction loss. The hydraulic cylinder leakage amount could be shown as Equation (28):…”

Section: Hydraulic Cylinder Power Lossmentioning

confidence: 99%

Multi-Objective Optimization of Kinetic Characteristics for the LBPRM-EHSPCS System

Zhang,

Chen,

Yan

et al. 2023

Processes

View full text Add to dashboard Cite

show abstract

“…Digital hydraulic technology is considered to be a potential solution to replace traditional hydraulic servo control technology in the "Industry 4.0" era [10]. Digital hydraulic technology is now used in a wide variety of fields, such as aircraft braking systems [11], aircraft actuators [12], construction machinery [13,14], conveyors [15], and wave energy recovery systems [16]. Digital valves mainly consist of incremental digital valves and high speed on/off valves (HSV), of which the former have been abandoned by academia and industry due to its low-frequency and tendency to become out-of-step.…”

Section: Introductionmentioning

confidence: 99%

Research Status and Prospects of Control Strategies for High Speed On/Off Valves

et al. 2023

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As the working conditions of host equipment become more complex and severe, performance improvement and increased intelligence of high speed on/off valves (HSV) are inevitable trends in the development of digital hydraulic technology. The characteristics of HSVs can be regulated by control strategies, which determine the comprehensive performance of the system. This paper discusses the development of control strategies for HSVs. First, the results of research in relation to the discrete voltage and pulse control of single HSVs and the coding control of parallel HSVs are summarized. In addition, the advantages, disadvantages and application scope of different control strategies are analyzed and compared. Finally, the development trends are predicted from the performance regulation, intelligent maintenance, intelligent coding and function programmability.

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“…9 The output flow of the FSV is depending on the ratio of opening time and closed time in a cycle, which is controlled by the duty ratio of the PWM (pulse width modulation). 10,11 The switching frequency of the FSV has a significant influence on the output flow characteristics. Therefore, to improve the switching frequency, an intelligent PWM control strategy is usually used in which a boost voltage is optimized to get a faster opening speed of the FSV.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the transient impact characteristics of fast switching valve during excitation stage

Gao

2022

Journal of Low Frequency Noise, Vibration and Active Control

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Fast switching valve (FSV) inevitably experiences high-speed impact while obtaining high dynamics, which affects its control accuracy and service life. In this article, the impact characteristics of the FSV during the excitation stage are investigated. Firstly, a nonlinear mathematical model considering the magnetic saturation is established and verified. Then, the influences of three types of driving voltages on the initial impact velocity and the opening time of the FSV are analyzed, which proves that only the driving voltage featured by an interval of negative voltage (−24V) can obtain a good balance between the initial impact velocity and opening time. In addition, finite element simulations of transient impact characteristics show that smaller initial impact velocity is beneficial to reduce the impact displacement, equivalent stress, and wear volume. The influences of impact times on the flow area of the valve seat are quantitatively analyzed under different impact velocities. Theoretical results indicate that, compared to the high driving voltage, the variation of flow area per million impacts is reduced by 27.3% under the presented driving voltage. Finally, experimental results demonstrate that with the presented driving voltage, the average acceleration and the average noise are reduced by 65.7% and 12%, respectively. And the acceleration frequency spectrum and the modal simulation both reveal the composition of impact noise, in which the noise heard by the human ear is mainly impacted noise, not the ringing noise.

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A novel architecture of electro-hydrostatic actuator with digital distribution

Cited by 26 publications

References 27 publications

Multi-Objective Optimization of Kinetic Characteristics for the LBPRM-EHSPCS System

Multi-Objective Optimization of Kinetic Characteristics for the LBPRM-EHSPCS System

Research Status and Prospects of Control Strategies for High Speed On/Off Valves

Investigation on the transient impact characteristics of fast switching valve during excitation stage

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