A Hydraulic-Oil Pump System using SR Drive with a Direct Torque Control Scheme

Dong-Hee Lee,Tae-Hyoung Kim,Jin-Woo Ahn 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.3

The hydraulic-oil pump is widely used for building machinery, brake systems of vehicles and automatic control systems due to its high dynamic force and smooth linear force control performance. This paper presents a novel direct instantaneous pressure control of the hydraulic pump system with SRM drive. The proposed hydraulic pump system embeds the pressure controller and direct instantaneous torque controller. Due to the proportional relationship between pump pressure and torque, pressure can be controlled by the motor torque directly. The proposed direct torque controller can reduce inherent torque ripple of SRM, and develop a smooth torque, which can increase the stability of the hydraulic pump. The proposed hydraulic pump system has also fast step response and load response. The proposed hydraulic pump system is verified by computer simulation and experimental results.

전차 유압펌프용 ISG(Idle Stop & Go) 시스템 개발

권유나,오은빈,김윤곤,김상현 한국기계기술학회 2024 한국기계기술학회지 Vol.26 No.4

The main hydraulic pump is a device that generates the hydraulic pressure needed for the K2 tank. It is a pressure-compensated swash plate piston pump that generates the hydraulic power necessary to drive the hydraulic device. Hydraulic pump design changes were made due to frequent failures of the hydraulic pump. As a result of checking the operation records of the hydraulic pump, about 71% of the total engine operation time was in a stationary state where hydraulic pressure was not needed. This has the problem of constantly running when the engine is started, consuming unnecessary endurance time, and generating high noise. In this study, ISG(Idle Stop & Go) was applied to improve operation method. When applying ISG, the pressure can be reduced to about 85% or less in an environment where the operation of the main hydraulic pump is not necessary. So, the lifespan of the main hydraulic pump increases as a result of ISG application, thereby reducing the waste of national funds due to maintenance costs. Also, it is expected to contribute to improving combat power by reducing crew fatigue due to noise reduction.

A Hydraulic-Oil Pump System using SR Drive with a Direct Torque Control Scheme

Lee, Dong-Hee,Kim, Tae-Hyoung,Ahn, Jin-Woo The Korean Institute of Power Electronics 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.3

The hydraulic-oil pump is widely used for building machinery, brake systems of vehicles and automatic control systems due to its high dynamic force and smooth linear force control performance. This paper presents a novel direct instantaneous pressure control of the hydraulic pump system with SRM drive. The proposed hydraulic pump system embeds the pressure controller and direct instantaneous torque controller. Due to the proportional relationship between pump pressure and torque, pressure can be controlled by the motor torque directly. The proposed direct torque controller can reduce inherent torque ripple of SRM, and develop a smooth torque, which can increase the stability of the hydraulic pump. The proposed hydraulic pump system has also fast step response and load response. The proposed hydraulic pump system is verified by computer simulation and experimental results.

The reliability Assessment Technique of the Hydraulic Pump for Agricultural Tractor during the Actual Agricultural Operations

( Abu Ayub Siddique ),백승민 ( Seung-min Baek ),이대현 ( Dae-hyun Lee ),김용주 ( Yong-joo Kim ) 한국농업기계학회 2022 한국농업기계학회 학술발표논문집 Vol.27 No.2

This study was focused on the development of the reliability test technique for the hydraulic pump of a tractor during major agricultural operations at various driving and PTO gear stages. The hydraulic pressure measurement system was installed on the tractor. The measured hydraulic pressure and engine rotational speed were converted to the equivalent pressure and engine speed for each agricultural operation using a mathematical formula. Also, the overall equivalent pressure and overall engine speed were calculated to determine the acceleration lifetime. Finally, the developed reliability test technique was evaluated by RS-B-0063, which is the existing reliability evaluation standard for agricultural hydraulic gear pumps. The overall equivalent pressure of the hydraulic pump and the engine rotational speed were found around 10.07 MPa and 1,512.93 rpm, respectively. The acceleration factor was calculated using the overall pressure and engine speed accounting for 336. The evaluation results proved that the developed reliability test method for the hydraulic pump of a tractor satisfied the standard criteria. The warranty life was increased 1.64 times and fault-free test time was decreased 22.73 times, which indicate that the developed technique is efficient and economic. Therefore, it could be said that the developed reliability test technique could be applicable to the hydraulic pump of the tractor during agricultural field operations.

굴삭기 전기동력시스템의 동작점 제어 알고리즘에 관한 연구

이지혜(Jihye Lee),이지호(Jeeho Lee),오창은(Chang Eun Oh),이형철(Hyeongcheol Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5

This paper presents an optimal operation point control algorithm for a hydraulic pump and an electric motor in an electric excavator system. The system consists of a hydraulic pump and a motor: the one delivers the power to hydraulic actuators and the other conveys the power to the hydraulic pump. The system requires an operating point control with efficiency maps of the motor and the hydraulic pump respectively because the efficiency feature of the system is different from that of conventional diesel engine excavator. In this paper, an integrated efficiency map is derived from each efficiency map of the motor and the hydraulic pump. Operation points are produced where the integrated efficiency is the maximum under the same power and the same pressure condition. An optimal operating point control algorithm of the electric-hydraulic system is proposed and simulations are performed through the MILS (Model-In-the-Loop Simulator). The efficiency of this system is improved compared with that of the uncontrolled electric-hydraulic system.

Performance Prediction and Flow Characteristics of a Hydraulic Pump for ABS and ESC Systems Using FSI Simulation

모장오,이영호 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.6

The electronic stability control (ESC) system is a computerized technology that improves vehicle stability by detecting and reducing the loss of traction. The hydraulic control unit for an anti-lock braking system (ABS) or an ESC system in a car includes a hydraulic pump located between the wheel and master cylinder. The function of the hydraulic pump is to allow the brake fluid to return from the wheel to the master cylinder when the ABS or ESC is actuating. This study performs numerical investigations with the aim of predicting the performance of the hydraulic pump by better understanding the dynamic behavior characteristics of the inlet ball under instantaneous fluid forces during the suction cycle and the corresponding flow characteristics under various motor speeds. A fluid-structure interaction (FSI) simulation of the hydraulic pump is conducted under various motor speeds with an unsteady three-dimensional approach considering laminar flow and the user-defined function (UDF). Experimental verification of the simulation results at the standard pump pumping test system of the Mando Corporation in Korea indicates considerable reliability. The findings of this research can provide valuable insights into designing high-efficiency pumps.

Hydraulic performance and flow resistance tests of various hydraulic parts for optimal design of a reactor coolant pump for a small modular reactor

배병언,정재호,유제용 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.3

Hydraulic performance and flow resistance tests were performed to confirm the main parameters of the hydraulic instrumentation that can affect the pump performance of the reactor coolant pump. The flow resistance test offers important experimental data, which are necessary to predict the behavior of the primary coolant when the circulation of the reactor coolant pump is stopped. Moreover, the shape of the hydraulic section of the pump, which was considered in the test, was prepared to compare the mixedflow- and axial-flow-type models, the difference in the number of blades of the impeller and diffuser, the difference in the shape of the impeller blade and its thickness, and the effect of coating at the suction bell. Additionally, five models of the hydraulic part were manufactured for the experiments. In this study, the differences in performance owing to the design factors were confirmed through the experimental results

Hydraulic components’ matching optimization design and entropy production analysis in a large vertical centrifugal pump

Gang Yang,Xutao Zhao,Desheng Zhang,Linlin Geng,Xueqi Yang,Xiongfa Gao 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11

The large vertical centrifugal pump is the core power equipment for longdistance water division and large-scale irrigation projects. The power of the matching motor can reach 40 MW. In view of reducing the operating energy consumption of this kind of pump, the efficiency under the design condition was taken as the optimization objective, and a matching optimization on hydraulic components was proposed in this research. The optimization process was divided into two stages. The first stage focused on improving the configuration of the vane diffuser. In the second stage, the Plackett-Burman test design was used to screen out the optimization design variables of the vane diffuser and the volute, the optimal Latin hypercube sampling method was adopted to generate 106 sample cases, and an automatic numerical simulation optimization platform was built. Then, different approximate models were employed to construct the relationship between the optimization design variables and the objective function, and their fitting accuracy and robustness were compared. Finally, the optimal design parameters were determined by particle swarm optimization, and entropy production theory was used to analyze the internal flow pattern of the model before and after optimization. Results showed that D 3 , b 4 , β 3 , and S 8 have the greatest impact on the hydraulic efficiency of the pump. The multilayer backpropagation neural network has a higher fitting accuracy and better robustness compared with the other three approximate models. The efficiency of the optimized model under the design condition is increased by 4.22 %, reaching 90.82 %. Reducing the number of layers and vanes of the diffuser and improving the matching of hydraulic components can dramatically improve the hydraulic performance and hump characteristics of large vertical centrifugal pumps. Entropy production theory is a reliable approach to visualizing flow loss. The turbulent flow dissipation in the vane diffuser can be reduced the most after optimization.

양경전 사판구조의 유압펌프 개발

성태성(S. T. Sung),김명식(M. S. Kim),한진희(J. H. Han) 유공압건설기계학회 2018 유공압건설기계학회 학술대회논문집 Vol.2018 No.11

In this study, we will introduce the development of an engine driven pump that applies to ship electronic control engines. In ship engines, the Hydraulic Power Supply(HPS) is a key device. If a problem occurs with the hydraulic pump applied to the HPS, there is a big problem. To prevent this, specifications and factors that are required by users were identified and designed. For this purpose, the operating environment of the HPS was identified and the components needed for electronic control were applied to the hydraulic pump. The components of the hydraulic pump are designed based on the level of durability required by the user. The last hydraulic pump was introduced and the durability level was identified.

Effect of O-ring Deformation on Saturated Load Pressure of the Small Piezoelectric-Hydraulic Pump Brake System

NGUYEN ANH PHUC,황재혁,배재성 한국항공우주학회 2020 International Journal of Aeronautical and Space Sc Vol.21 No.1

This paper examines the effect of deformation of the O-ring on maximum pressure in the load side of the small piezoelectric-hydraulic pump brake system. In the previous study, the small piezoelectric-hydraulic pump braking system used for small- and medium-sized unmanned aerial vehicles was developed. To operate the brake system, load pressure must be formed. The magnitude of the load pressure is determined by the pressure in the chamber and the adapted check valve type. Therefore, a study of the parameters affecting the chamber pressure is necessary to improve the load side pressure. The volume change of the O-ring seal has a complicated effect on the maximum pressure in the chamber of the piezoelectric-hydraulic pump. Accordingly, this study analyzed the effect of the O-ring on chamber pressure, considering the changing volume of the O-ring seal with nonlinear property material. The deformation of the O-ring made of nitrile-butadiene rubber was investigated using the finite-element method. In addition, the optimal radius of the piston was determined to obtain the maximum chamber pressure. The obtained maximum pressure and optimal radius are verified by comparison with the pressurization experiment using the developed small piezoelectric-hydraulic pump brake system.