Electro-hydraulic servo plate-inclined plunger hydraulic transformer

Liu, Chengqiang; Liu, Yinshui; Liu, Jiaxin; Yang, Guang; Zhao, Xufeng; Quan, Weicai

doi:10.1109/access.2016.2628355

Cited by 15 publications

(15 citation statements)

References 16 publications

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“…It can be seen from Figure 8(ba) that the discharge pressure increases with the increase of the control angle, while deviating from the ideal delivery pressure curve proposed in the literature, 11 especially when the magnitude of the control angle exceeds 30°. The pressure increase can be explained by equation (13), in which the load torque is the result of the force balance based on D’Alembert’s principle.…”

Section: Resultsmentioning

confidence: 64%

“…Above all, the numerical results exhibit a good match with the test results and are compared with the previous studies, in which the test results showed that the pressure level and the rotating speed are around 10 MPa and 1000 r/min, respectively. 10,11 The robust rotor structure enables large pressure and rotating speed, which is the foundation of DRHT. Therefore, the novel double rotor structure and the mathematical model presented in this research are proved to be feasible and effective.…”

Section: Experimental Verificationmentioning

confidence: 99%

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Pressure characteristics of a novel double rotor hydraulic transformer

Jiang

Liu

2019

Proceedings of the Institution of Mechanical Engineers, Part I:

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The hydraulic transformer is the core component when it works with the common pressure rail system, which integrates the functions of the pump and the motor, and thus possesses sensitive pressure characteristics. The rotating speed has significant influence on the pressure characteristics of a hydraulic transformer while it has not been considered previously. In this study, aimed at improving the working performance, a novel double rotor hydraulic transformer is proposed and a comprehensive mathematical model considering the dynamic characteristics of the cylinder block is established. At the same time, a prototype is made and the experiment is conducted. The test results show that the robust rotor structure enables a larger pressure range, and the numerical results exhibit a good match with the test results. The parameter sensitivity study shows that the delivery pressure is mainly subject to the valve plate control angle δ and, under the effects of the resistance torques, pressure loss will occur especially under a large control angle and a high rotating speed. The magnitude of the instantaneous angular velocity fluctuation increases sharply when the speed is lower than 400 r/min, which is the main reason for the serious pressure pulsation at a low speed. As a result of the improved low-speed stability and output flow uniformity, the pressure pulsation rate of the double rotor hydraulic transformer is greatly reduced. However, the pulsation rate is still high at an extremely low speed. In addition, when the rotating speed exceeds the capability of the damping grooves, the pressure undershoot becomes serious at the A-T transition region around the control angle of −30°. Consequently, from the perspective of pressure characteristics, the limitation on the rotating speed under small control angles is suggested for the design of the double rotor hydraulic transformer controller.

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Section: Resultsmentioning

confidence: 64%

Section: Experimental Verificationmentioning

confidence: 99%

Pressure characteristics of a novel double rotor hydraulic transformer

Jiang

Liu

2019

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…(15,16) and Eqs. (17,18), in a period, the maximum instantaneous power (P jmax ), the minimum instantaneous power (P jmin ), and the average power (P jmean ) can be acquired. The power pulsation coefficients can be obtained: Power characteristics of a variable hydraulic transformer Namely, the power pulsation coefficient at the A-port is:…”

Section: Fixed Control Angle Of Swash Plate and Variable Control Anglmentioning

confidence: 99%

“…14 Like the noise in a pump or a motor, the noise reduction in the IHT is under study. [15][16][17] Recently, many achievements have been made in the research of the IHT's applications, specifically in the aspect of pressure control. [18][19][20][21] However, little has been reported on the flow control of the IHT.…”

Section: Introductionmentioning

confidence: 99%

Power characteristics of a variable hydraulic transformer

Yang

Jiang

2015

Chinese Journal of Aeronautics

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The flow control of hydraulic transformers is a great challenge. To meet this challenge, a new kind of hydraulic transformer, variable hydraulic transformer (VHT), is proposed in this work. This paper focuses on the power characteristics of the newly proposed VHT, including instantaneous power, average power, power pulsation, and efficiency. In the analyses, the concepts of efficiency, input power, output power, starting angle, and ceasing angle are defined or redefined. To investigate the power characteristics, their models are derived by considering the governing factors such as the control angle of the swash plate and the structure of the port plate. This work highlights that the load flow can be adjusted by adjusting the control angle of the swash plate, and the power characteristics at the B-port produce a remarkable change. In addition, the VHT has a starting angle and a ceasing angle, and these two angles can be adjusted by the influencing factors. The results reveal that the power pulsation and the jump points of the instantaneous power are the primary causes of a less smooth work. Then, it is shown that the control angle of the port plate, the control angle of the swash plate, and the pressures at the ports are the three key elements for a stable operation. The results also reveal that the adjustment of the influencing factors can improve the efficiency.

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“…The flow ratio at ports A and B is the reciprocal of the pressure ratio. If ports A and B of the new type of hydraulic transformer are connected to the hydraulic load circuit in series, when the pressure of the load circuit changes with the working condition, after passing through the hydraulic transformer, the flow output from port B changes with the working condition [9][10][11]. This makes it difficult to control the flow in the load.…”

Section: Introductionmentioning

confidence: 99%