The method of restraining hydraulic impact with active adjusting variable damping

Wang, Chengbin; Quan, Long; Ou, Hengan

doi:10.1177/0954406218809740

Cited by 6 publications

(3 citation statements)

References 29 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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“…Hydraulic systems are widely used in aerospace [1,2], robotics [3,4], engineering machinery [5,6], and other fields [7][8][9]. With the rapid development of science and technology, all fields have set a higher request for the power-to-weight ratio.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Natural Heat Dissipation Capacity of Hydraulic Tank and Relevant Influencing Factors

Zhai

Wang

et al. 2022

Machines

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This paper aims to study the natural heat dissipation capacity of a hydraulic tank during its miniaturization revolution. A theoretical model of heat dissipation was built up on the basis of experimental analysis. Then, the natural heat dissipation power was deduced and shown to be relevant. Influencing factors were analyzed, which were the oil height proportion, design proportion, volume, material type, and wall thickness. The results showed that the heat dissipation power is proportional to the height of the oil in the tank. The power increases with the height proportional coefficient k2, while it first decreases and then increases with the length proportional coefficient k1. The lengthwise coefficient obviously has a more significant effect. The influence degree of reduction methods on natural heat dissipation is in the following order: length reduction > equal proportion reduction > height reduction > width reduction. Additionally, when the thermal conductivity λ is greater than 10 W/(m·K), the material and wall thickness of the tank slightly influence the heat dissipation capacity; otherwise, the influence is evident.

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“…Whereas, a number of articles are available to control the hydraulic motor speed using the active control scheme which is more costly and complex in nature compared to the passive control technique. 15–17 Therefore, implementing VIF to the hydraulic motor may be useful for applications where abrupt change in speed occurs. One such application is the wind-power generation, where gusty winds rotate the pump at fluctuating speed through the wind turbine that results in variable flow supplied to the hydraulic motor.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of a hydraulic motor drive with variable inertia flywheel

Kushwaha

Ghoshal

Dasgupta

2019

Proceedings of the Institution of Mechanical Engineers, Part I:

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A flywheel is presented in this article, which can adaptively generate variable inertia in response to the application requirements in a hydraulic drive. The said flywheel consists of four sliders in the guide track of a host flywheel frame which change its position as the rotational speed of the flywheel varies. The varying distance between the slider and the center of rotation leads to a variable inertial mass. This passive inertial mass has a potential to reduce the speed fluctuations of the drive. A comparative study has been made on the effects of the variable inertia flywheel on the hydraulic motor speed fluctuations with that of the fixed inertia flywheel. In this respect, a bond graph model of the hydraulic motor drive with the variable inertia flywheel and the fixed inertia flywheel is developed to analyze their performances. The variable inertia generated by the variable inertia flywheel reduces the hydraulic motor speed fluctuations in response to the changes in the excitation inputs. The tests were conducted to validate the model for step change in speed of the hydraulic motor. The test results of the hydraulic motor speed response are found in good agreement with the predicted response. The proposed design of the flywheel reduces the peak speed of the hydraulic motor that enhances the reliability and performance of the drive.

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The method of restraining hydraulic impact with active adjusting variable damping

Cited by 6 publications

References 29 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

Analysis of Natural Heat Dissipation Capacity of Hydraulic Tank and Relevant Influencing Factors

Dynamic analysis of a hydraulic motor drive with variable inertia flywheel

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