Research on the Deep-Sea Pressure Adaptive Hydraulic Manipulators and Its Flow Distribution Control Technique

2006 ◽  
Author(s):  
Yan Zhang ◽  
Linyi Gu ◽  
Feng Wang ◽  
Huiqiang Qiu ◽  
Xirong Yang ◽  
...  
Keyword(s):  
Hydraulic System ◽  
Flow Distribution ◽  
Control Technique ◽  
Theoretical Principle ◽  
Distribution Method ◽  
Load Sensing ◽  
Hydraulic Manipulators ◽  
Sensing System ◽  
Inner Pressure ◽  
Multiple Actuators

How to realize the pressure-resist and seal of the components is the key point for the development of the deepsea hydraulic manipulators. In this paper, a novel hydraulic system with the outer-inner pressure balanced technique is presented. Another key problem is that oil supply could not provide enough oil for the actuators when the joints are operated simultaneously. So, an electro-hydraulic digital flow distribution method based on meter-in flow feedback for multiple actuators load sensing system is put forward to distribute flows when two or more actuators are operated together. The corresponding theoretical principle is analyzed and the performances are evaluated through simulations.

Performances analysis of a novel load-sensing hydraulic system with overriding differential pressure control

2016 ◽  
Vol 231 (23) ◽  
pp. 4331-4343 ◽  
Author(s):  
Hu Quanyi ◽  
Zhang Hong ◽  
Tian Shujun ◽  
Qin Xuxin
Keyword(s):  
Hydraulic System ◽  
Graph Model ◽  
Pressure Control ◽  
Bond Graph ◽  
Differential Pressure ◽  
Operating Conditions ◽  
Control Mode ◽  
Variable Pressure ◽  
Load Sensing ◽  
Sensing System

The traditional load-sensing hydraulic system is an energy-saving fluid power transmission, which supply “on-demand” flow at a prescribed pressure margin greater than the highest load pressure of the system. In this paper, a novel load-sensing system that has a variable pressure margin through overriding differential pressure control via integrating an electro-proportional three-way type pressure reducing valve into the hydro-mechanical load-sensing valve is proposed. Also, a bond graph model taking into account the dynamic characteristics of load-sensing valve and load-sensing path is constructed, and three group experiments are performed to verify the validation of the model. Based on the bond graph model, a series of theoretical simulations are carried out to prove that the proposed Load-Sensing system enables a satisfactory balance between energy efficiency and rapid dynamic response over a wide range of operating conditions. In addition, due to overriding differential pressure control, mode selection and power limit regulation can also be achieved.

The Development of Embedded System for Energy Saving in Electro-Hydraulic System

2013 ◽  
Vol 418 ◽  
pp. 63-69
Author(s):  
Sema Patchim ◽  
Watcharin Po-Ngaen
Keyword(s):  
Embedded System ◽  
Low Power ◽  
Hydraulic System ◽  
Fuzzy Controller ◽  
Low Cost ◽  
Operational Performance ◽  
Functional Design ◽  
Power Utility ◽  
Load Sensing ◽  
Oil Flow

In last decade, energy efficiency of hydraulic actuators systems has been especially important in industrial machinery applications [1-. And an advanced electronics world most of the applications are developed by microcontroller based embedded system. Energy processor based variable oil flow of hydraulic controller was presented to improve the efficiency of the motor by maintaining with the load sensing. These PIC processor combined with fuzzy controller were help to design efficient optimal power hydraulic machine controller. A functional design of processor and in this system was completed by using load sensing signal to control oil flow. The advantage of the proposed system was optimized operational performance and low power utility. Without having the architectural concept of any motor we can control it by using this method. This is a low cost low power controller and easy to use. The experiment results verified its validity.

Application of Load Sensing Technology in New Type of Steel Arch Installing Machine

2013 ◽  
Vol 655-657 ◽  
pp. 1456-1459
Author(s):  
Li Ping Xu ◽  
Chen Fei Zhan ◽  
De Zhi Ren
Keyword(s):  
Energy Efficient ◽  
Hydraulic System ◽  
Control Performance ◽  
Multiple Fault ◽  
Type Steel ◽  
Load Sensing ◽  
Sensing Technology ◽  
New Type ◽  
Actuator Control

Because ordinary hydraulic system exists multiple fault, power waste and hard controlling in actuators due to the complexity of actuators and variability of load. A new hydraulic system based on the load sensing technology is designed for the new type steel arch installing machine. The results of the simulation for forearm loop based on AMESim show that the designed hydraulic system is energy-efficient and load sensing function is effectively achieved, the actuator control performance is well.

A double variable control load sensing system for electric hydraulic excavator

Energy ◽  
2021 ◽  
Vol 223 ◽  
pp. 119999
Author(s):  
Tianliang Lin ◽  
Yuanzheng Lin ◽  
Haoling Ren ◽  
Haibin Chen ◽  
Zhongshen Li ◽  
...  
Keyword(s):  
Hydraulic Excavator ◽  
Load Sensing ◽  
Sensing System ◽  
Variable Control ◽  
Control Load

Research into the Variable Speed Pump Control System for Driving the Cutter Head of Shield Tunneling Machine

2009 ◽  
Vol 628-629 ◽  
pp. 257-262 ◽  
Author(s):  
Tong Xing
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Closed Loop ◽  
Control Method ◽  
Control Technique ◽  
Closed Loop Control ◽  
Variable Speed ◽  
Shield Tunneling ◽  
Loop Control ◽  
Cutter Head

The cutter head drive hydraulic system of φ1.8m simulate shield machine is introduced in this article, which has the variable speed pump control technique and the closed loop control method. The AMESim simulation model of the hydraulic system is built up, and the efficiency of the hydraulic system, speed control performance by open loop and closed loop control are analyzed. The result of the simulation shows that the variable speed pump control system has higher efficiency than the variable displacement pump control system about 4%-26% in the same condition when the cutter head speed is at the range of 0.5-4r/min, and the hydraulic system has good dynamic characteristics in closed-loop PID control.

Methodology Development for Transient Flow Distribution Analysis in High Temperature Gas-Cooled Reactor

2020 ◽  
Author(s):  
Takeshi Aoki ◽  
Hiroyuki Sato ◽  
Hirofumi Ohashi
Keyword(s):  
High Temperature ◽  
Hydraulic System ◽  
System Analysis ◽  
Molecular Diffusion ◽  
Transient Flow ◽  
Flow Distribution ◽  
Distribution Analysis ◽  
Design Improvement ◽  
Air Ingress ◽  
High Temperature Gas

Abstract In the thermal hydraulic design of the prismatic-type of the high temperature gas cooled reactor (HTGR), unintended flows such as gap flows between columns, cross flows between column layers and gap flows between permanent reflectors should be analyzed to minimizing the unintended flows. The flow distribution considering unintended flows in the reactor has been evaluated for steady and conservative condition. On the other hand, the transient thermal hydraulic analysis for satisfactorily realistic conditions will be helpful for the design improvement of prismatic-type HTGR. The present study aims to improve the thermal hydraulic system analysis code developed by Japan Atomic Energy Agency based on the RELAP5/MOD3 code and confirm its applicability for the transient flow distribution analysis for prismatic-type HTGRs during anticipated operational occurrences and accidents for its design improvement utilizing experiences on high temperature engineering test reactor (HTTR) design. The calculation model and code were developed and validated to evaluate the detailed flowrate distribution considering the unintended flows in the core and the molecular diffusion that is important to analyze beginning air ingress behavior in an air ingress accident triggered by a rupture of a primary coolant piping in HTGR. It is concluded that a prospect has confirmed to apply the improved thermal hydraulic system analysis code for transient flow distribution analysis for prismatic-type HTGRs.

Power management of multi-source network hydraulic system with multiple actuators

2020 ◽  
Vol 223 ◽  
pp. 113247
Author(s):  
Jing Yao ◽  
Pei Wang ◽  
Yuxin Yin ◽  
Mandi Li ◽  
Yao Li
Keyword(s):  
Power Management ◽  
Hydraulic System ◽  
Multiple Actuators
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