Power characteristics of a variable hydraulic transformer

Yang, Guang; Jiang, Jihai

doi:10.1016/j.cja.2015.04.008

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…Recently, another type of HT, that is, variable hydraulic transformer (VHT), is presented by Yang and Jiang. 101,102 VHT is based on a variable pump or motor which meets the requirements that the load flow rate should vary with the change in the load pressure. It makes HT a power transducer rather than the pressure transducer.…”

Section: Different Strategies Of Energy Savingsmentioning

confidence: 99%

Energy-saving strategies on power hydraulic system: An overview

Mahato

Ghoshal

2020

Proceedings of the Institution of Mechanical Engineers, Part I:

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Different strategies for improving the energy efficiency of a power hydraulic system have been reviewed in this article. The energy-saving scheme is classified into three categories: S ystem design, Improving components or product functions and Loss reduction. The sub-categories of energy-saving strategies are discussed briefly. Also, different energy-saving potentials of power hydraulic system are presented in tabular form for clear understanding on the chronological development toward energy-efficient fluid power system.

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Section: Different Strategies Of Energy Savingsmentioning

confidence: 99%

Energy-saving strategies on power hydraulic system: An overview

Mahato

Ghoshal

2020

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…At present, the research of IHT mainly focuses on pressure control problem 32 and efficiency problems, 33,34 insufficient research has been done on flow control problems. Because the inclined angle of the swash plate is fixed, the load pressure and the load flow of IHT are corresponding to each other, that is, the flow cannot be controlled under the fixed load pressure.…”

Section: Introductionmentioning

confidence: 99%

Four-port hydraulic transformer with inlet and outlet equal flow and its flow characteristics

Zhang

Zhou

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Without changing the original valve control hydraulic system, a kind of hydraulic transformer, called four-port hydraulic transformer (FHT), is proposed to recover the energy loss caused by system throttling. The remarkable feature of FHT is that the flow rate at inlet and outlet ports are equal. This means that FHT can be connected into the load circuit of hydraulic system to recovery energy without refreshing flow rate. This paper investigates the flow characteristics of FHT, including instantaneous flow rates, average flow rates and flow pulsations in each port. The relationships between the structure of port plate and the flow characteristics are given. The variation rule of number of plungers connected to four ports is shown, and the relationship between the variation and the flow pulsation is revealed. The simulation results show that the flow rates and displacements of symmetrical ports are same, and the instantaneous flow rate of symmetrical ports has the same rule. The results also show the frequent changes of the number of plungers connected with each port lead to more flow jump points in instantaneous curves, and the jump point is the basic cause of its loud noise. The test shows that the flow rates of measurement data of the experiment are very close to the theoretical analysis, proved the theoretical analysis of flow characteristics for FHT are appropriate and reasonable, which has a certain reference for the development and energy-saving application for FHT.

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“…In addition, the frictional moment, the fluid elastic modulus and the influence of the swashplate angle were also not fully considered. 21,22 Above all, the establishment of an accurate mathematical model is also of great significance.…”

Section: Introductionmentioning

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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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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Power characteristics of a variable hydraulic transformer

Cited by 9 publications

References 6 publications

Energy-saving strategies on power hydraulic system: An overview

Energy-saving strategies on power hydraulic system: An overview

Four-port hydraulic transformer with inlet and outlet equal flow and its flow characteristics

Pressure characteristics of a novel double rotor hydraulic transformer

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