Displacement and dual-pressure compound control for fast forging hydraulic system

Yao, Jianyong; Li, Bin; Kong, Xianwen; Zhou, Fang

doi:10.1007/s12206-015-1240-5

Cited by 18 publications

(8 citation statements)

References 14 publications

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“…Consensus on the formation and development mechanism of pressure relief has not yet been reached. At present, researches mainly focus on the valve-controlled hydraulic press system, including analyzing the transmission rule of the pressure wave in the pipeline [19,20], proposing the active compensation method for the pressure-impact prediction of the directional valve [21,22], using the electro-hydraulic proportional cartridge valve as the pressure-relief valve [23], and designing an energy sinusoidal pressure-relief curve [24]. However, research on the pressure-relief process of pump-controlled hydraulic presses has rarely been reported.…”

Section: Working Cylinder Oil Compression Energy Storagementioning

confidence: 99%

Pressure-Relief Impact Control of Open Circuit Hydraulic Pump-Controlled Forging Press System

et al. 2019

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Taking the open circuit hydraulic pump-controlled forging press system as the research object, according to the problems of pressure-relief impact of this system, the pressure-relief rules, mathematic models of the energy release rules, and the flow release rules were established, and the pressure-relief performance in different stages of each pressure-relief curve was analyzed. Based on the different requirements of the pressure gradient decrease, the combined pressure-relief curve (CPRC) was proposed to realize variable-pump eccentric magnitude planning. An experimental study on the pressure-relief process with CPRC was carried out. The results show that the pressure fluctuation of the pressure-relief pipe was reduced and the suppression effect of pressure-relief impact was better than that of the single regular pressure-relief curve. When the initial pressures were 10 MPa and 15 MPa, the pressure impact of the pressure-relief tube decreased by 45.45% and 37.5%, respectively, which realized the smooth pressure relief of the main cylinder.

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Section: Working Cylinder Oil Compression Energy Storagementioning

confidence: 99%

Pressure-Relief Impact Control of Open Circuit Hydraulic Pump-Controlled Forging Press System

et al. 2019

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“…In 2009, Chen and Zhou [19] from Lanzhou, China, proposed a strategy for increasing the size of variable pump between the gearbox and the generators in hydraulic wind turbines; however, the gearbox mechanism was retained. In 2012, the team of Professor Kong from Yanshan University, China, built a hydraulic wind turbine simulation platform, which verified the speed and power control theories of hydraulic wind turbines [20][21][22][23][24]. In summary, several countries have not in the recent past proposed theories on hydraulic wind turbines, constructed actual hydraulic wind turbines, built experimental prototypes, and/or developed initial production.…”

Section: Development Of Hydraulic Wind Turbinesmentioning

confidence: 99%

Review of fluid and control technology of hydraulic wind turbines

et al. 2017

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This study examines the development of the fluid and control technology of hydraulic wind turbines. The current state of hydraulic wind turbines as a new technology is described, and its basic fluid model and typical control method are expounded by comparing various study results. Finally, the advantages of hydraulic wind turbines are enumerated. Hydraulic wind turbines are expected to become the main development direction of wind turbines.

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“…Different hardness of the soil layer during the work of excavators can cause the pressure impact of the hydraulic circuit of the bucket [4]. The pressure impact during operations of various presses can affect their motion accuracy [5]. The foot-ground impact can produce displacement disturbance of the hydraulic actuator when the foot hydraulic robot is performing dropping or jumping action [6].…”

Section: Introductionmentioning

confidence: 99%

Experiment and analysis of drop-weight damping control of MR semi-active impact resistance-based hydraulic actuator

Ma,

Huang,

Tang

et al. 2023

Smart Mater. Struct.

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The impact vibration caused by sudden changes in the external load of hydraulic actuators reduces the service life of hydraulic components and limits the high-precision applications of hydraulic actuators. Therefore, to improve the underdamped characteristics and impact resistance of valve-controlled cylinder systems, a semi-active impact resistance control of hydraulic actuator based on magnetorheological damper (MRD) is proposed. Firstly, based on the shear force characteristics of magnetorheological fluid, a multi-stage flow channel MRD is designed, which is connected in series with the hydraulic actuator to form a Hydraulic Damping Actuator (HDA). Meanwhile, based on the mechanical experimental data, the parameters of MRD dynamic model are identified to ensure the accuracy of MRD output force. Secondly, a drop weight impact model is established, and a sliding mode controller which can track the command current in real time is designed, so as to realize the resistance force coupling between the MRD and the hydraulic actuator for improving the impact resistance control effect. Then the dynamic performance test and impact resistance simulation program are established to verify the excellent dynamic performance and impact resistance effect of the HDA with the sliding mode control. Finally, the drop weight impact experimental platform is built. The experimental results show that under the impact with a height of 200 mm, the dynamic offset of the HDA is only -1.14 mm, and the time to return to the original position is 0.07 s, which validate the excellent performance of the proposed scheme in improving the underdamped characteristics of the valve-controlled cylinder system and the dynamic response performance of the hydraulic actuator.

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Displacement and dual-pressure compound control for fast forging hydraulic system

Cited by 18 publications

References 14 publications

Pressure-Relief Impact Control of Open Circuit Hydraulic Pump-Controlled Forging Press System

Pressure-Relief Impact Control of Open Circuit Hydraulic Pump-Controlled Forging Press System

Review of fluid and control technology of hydraulic wind turbines

Experiment and analysis of drop-weight damping control of MR semi-active impact resistance-based hydraulic actuator

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