Modeling and Analysis on Servo Adjustment of Bidirectional Variable Displacement Pump in Hydraulic Drive System of the Cutter Head in a Shield Tunneling Machine

2010 ◽  
Vol 44-47 ◽  
pp. 1380-1386
Author(s):  
Bi Zhong Xia ◽  
Ping Fa Feng ◽  
Hua Yong Yang
Keyword(s):  
Transfer Functions ◽  
Hydraulic Drive ◽  
Drive System ◽  
Shield Tunneling ◽  
Modeling And Analysis ◽  
Initial Control ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Working Principle ◽  
Cutter Head

Based on introduction of the basic configuration, working features of hydraulic drive system of the cutter head in a shield machine, the internal structure of the bidirectional variable displacement pump, BVDP, as the kernel element in the above hydraulic system, is depicted and compared with the ordinary variable plunger pump. Then the working principle and process of hydraulic pilot operated servo displacement adjustment about the BVDP are discussed in detail, and then the mathematical models and its transfer functions of the positive and negative displacement adjustments are established respectively. Also, the relationships between the primary performance indices such as stability condition, positioning stiffness, steady-state error, as well as initial control pressure and system parameters are analysis and concluded.

Traction Force and Climbing Capacity Theoretical Analysis of Hydraulic In-Wheel Motor Drive System

2013 ◽  
Vol 765-767 ◽  
pp. 171-175 ◽  
Author(s):  
Xiao Hua Zeng ◽  
Hui He ◽  
Zhen Ping Zhou ◽  
Sheng Li ◽  
Xiang Hua Li ◽  
...  
Keyword(s):  
Traction Force ◽  
Drive System ◽  
Motor Drive ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Working Principle ◽  
Heavy Truck ◽  
Simulation Results ◽  
Passing Ability ◽  
Motor Drive System

The objective of this paper is to introduce a newly developed Hydraulic In-wheel Motor Drive System (HIMDS) mainly made up of a variable displacement pump and two motors. The new HIMDS is primarily applied to heavy truck to improve its passing ability when encountering the low-roads. This paper Not only illustrates the structure and working principle of the system, but also gives a detailed description of calculation of the improvement in traction force and climbing capacity of the vehicle after working with HIMDS. The Simulation results show that after using the system, the vehicle traction force was increased by 23%, and the climbing capacity was improved by 30% mostly.

Wheeled Off-Road Excavator with 2-Dof Articulated Body

2012 ◽  
Vol 220-223 ◽  
pp. 836-840
Author(s):  
Tong Jian Wang ◽  
Bo Bo Xi ◽  
Wei Chen ◽  
Chuan Xiang Lv
Keyword(s):  
Hydraulic Drive ◽  
Drive System ◽  
Adams Simulation ◽  
Key Technologies ◽  
Working Principle ◽  
Passing Ability

Proposed wheeled off-road excavator with 2-Dof articulated body, and analyzed the working principle of the 2-Dof articulated body, machine-hydraulic drive system and the key technologies .Through the study of the vehicle drive system matching calculation and the ADAMS simulation of articulated body, the results show that the articulated truck has good passing ability, stability and adaptability on a complex road.

Energy saving of cutterhead hydraulic drive system of shield tunneling machine

2014 ◽  
Vol 37 ◽  
pp. 11-21 ◽  
Author(s):  
Hu Shi ◽  
Huayong Yang ◽  
Guofang Gong ◽  
Huaiyin Liu ◽  
Dianqing Hou
Keyword(s):  
Energy Saving ◽  
Hydraulic Drive ◽  
Drive System ◽  
Shield Tunneling ◽  
Shield Tunneling Machine ◽  
Tunneling Machine

Modeling and Control Design of a Powertrain Simulation Testbed for Earthmoving Vehicles

1999 ◽  
Author(s):  
Eko A. Prasetiawan ◽  
Rong Zhang ◽  
Andrew G. Alleyne ◽  
Tsu-Chin Tsao
Keyword(s):  
First Principles ◽  
Control Design ◽  
System Response ◽  
Prime Mover ◽  
Linear Quadratic ◽  
Modeling And Control ◽  
Initial Control ◽  
Displacement Pump ◽  
Variable Displacement ◽  
And Control

Abstract A nonlinear model of an Earthmoving Vehicle Powertrain Simulator is developed using both first principles as well as I/O data. The model is an interconnection of subsystem models, which consist of a prime mover, a variable-displacement pump, proportional flow valves, and fixed-displacement motor models. In addition, a typical drive or tractive load of an earthmoving vehicle is also presented and implemented in the system as one of the loads. Efforts have been directed to develop a simple model in order to cater to developing and testing powertrain controllers as well as studying the dynamic behavior of such systems. An initial control design approach utilizing the Linear Quadratic technique is also presented. The controller is aimed at regulating load speeds in presence of a step load disturbance. The simulation results of the compensated system response are presented.

Simulation Study on Load-Sensing Hydraulic Drawing System of Coal Mining Machine

2010 ◽  
Vol 37-38 ◽  
pp. 1195-1198
Author(s):  
Tian Hao Peng ◽  
Mei Sheng Yang ◽  
Xiao Song Hao ◽  
Jia Dong Liu
Keyword(s):  
Coal Mining ◽  
Simulation Study ◽  
Mining Machine ◽  
Plunger Pump ◽  
Load Sensing ◽  
Drawing System ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Working Principle ◽  
New System

A new hydraulic drawing system of coal mining machine is proposed in this paper. The variable plunger pump adopted in the hydraulic drawing system of coal mining machine is replaced by load-sensing variable displacement pump. The working principle and energy-saving of the new system are introduced. The performance of the new system is obtained by the simulation study using AMESim.

Velocity and Load Characteristics Analysis of Pump-Control-Motor Hydraulic Drive System

2010 ◽  
Vol 139-141 ◽  
pp. 947-951 ◽  
Author(s):  
Ming Long ◽  
Ai Min Hu ◽  
Zhi Gang Gao ◽  
Xian Jian He
Keyword(s):  
Control System ◽  
Working Conditions ◽  
Hydraulic Drive ◽  
Drive System ◽  
Hydraulic Control ◽  
Pressure System ◽  
System Pressure ◽  
Characteristics Analysis ◽  
Cutter Head ◽  
Hydraulic Control System

Pump-control-motor hydraulic drive system is a common used volume speed-modulating loop in hydraulic control system. Aiming at the working conditions of the cutter head of the tunnel excavator used in the large underground excavation, a pump-control-motor hydraulic drive system was applied that composed of three variable displacement hydraulic pumps and eight hydraulic motors, which can control the rotate speed of the cutter head in real time. The simulation model of the pump-control-motor was established using the AMESim software. The relationships among the rotate speed, torque of the cutter head and the system pressure, system flow were investigated in detail under several typical working conditions in tunneling. The relevant results can provide theory references for design of pump-control-motor hydraulic control system in other occasions.

Stabilization of the Speed of the Hydraulic Motor Through Throttle Compensation for Volume Losses

2020 ◽  
Vol 26 (3) ◽  
pp. 126-130
Author(s):  
Krasimir Kalev
Keyword(s):  
Flow Rate ◽  
Hydraulic Drive ◽  
Pressure Change ◽  
Operating Conditions ◽  
Drive System ◽  
Inlet Pressure ◽  
Schematic Diagram ◽  
Hydraulic Characteristics ◽  
Hydraulic Motor ◽  
Flow Through

AbstractA schematic diagram of a hydraulic drive system is provided to stabilize the speed of the working body by compensating for volumetric losses in the hydraulic motor. The diagram shows the inclusion of an originally developed self-adjusting choke whose flow rate in the inlet pressure change range tends to reverse - with increasing pressure the flow through it decreases. Dependent on the hydraulic characteristics of the hydraulic motor and the specific operating conditions.

Energy-saving design of variable-displacement bi-directional pump-controlled electrohydraulic system

2020 ◽  
pp. 095965182097389
Author(s):  
Samir Kumar Hati ◽  
Nimai Pada Mandal ◽  
Dipankar Sanyal
Keyword(s):  
Energy Saving ◽  
Absolute Error ◽  
Fast Response ◽  
Maximum Energy ◽  
Radial Clearance ◽  
Simulation Based Design ◽  
Simulation Based ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Axial Piston

Losses in control valves drag down the average overall efficiency of electrohydraulic systems to only about 22% from nearly 75% for standard pump-motor sets. For achieving higher energy efficiency in slower systems, direct pump control replacing fast-response valve control is being put in place through variable-speed motors. Despite the promise of a quicker response, displacement control of pumps has seen slower progress for exhibiting undesired oscillation with respect to the demand in some situations. Hence, a mechatronic simulation-based design is taken up here for a variable-displacement pump–controlled system directly feeding a double-acting single-rod cylinder. The most significant innovation centers on designing an axial-piston pump with an electrohydraulic compensator for bi-directional swashing. An accumulator is conceived to handle the flow difference in the two sides across the load piston. A solenoid-driven sequence valve with P control is proposed for charging the accumulator along with setting its initial gas pressure by a feedforward design. Simple proportional–integral–derivative control of the compensator valve is considered in this exploratory study. Appropriate setting of the gains and critical sizing of the compensator has been obtained through a detailed parametric study aiming low integral absolute error. A notable finding of the simulation is the achievement of the concurrent minimum integral absolute error of 3.8 mm s and the maximum energy saving of 516 kJ with respect to a fixed-displacement pump. This is predicted for the combination of the circumferential port width of 2 mm for the compensator valve and the radial clearance of 40 µm between each compensator cylinder and the paired piston.

Analysis of Flow Resistance Influence on Step-Down Process of the Control Rod Hydraulic Drive System

2021 ◽  
Author(s):  
Linqing Yang ◽  
Benke Qin ◽  
Hanliang Bo
Keyword(s):  
Theoretical Model ◽  
Flow Resistance ◽  
Inflection Point ◽  
Great Influence ◽  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Drive System ◽  
Pressure Curve ◽  
Control Rod ◽  
Step Down

Abstract Control rod hydraulic drive system (CRHDS) is a new type of built-in control rod drive technology which is invented by INET, Tsinghua University. The integrated valve (IV) is the main flow control component of the CRHDS. Flow resistance of IV has a great influence on the control rod dynamic step-down process. The step-down performance experiments of CRHDS with different flow resistance of IV were conducted under room temperature conditions. Meanwhile, the theoretical model of hydraulic cylinder step-down process was established and combined with the relationship of the flow resistance of IV under the experimental conditions to get the dynamic response of the hydraulic cylinder. The calculation results of theoretical model agree well with the experimental data. On this basis, the theoretical model of hydraulic cylinder step-down process was applied to the high temperature working conditions with different flow resistance of IV. The analysis results show that at higher working temperature, with the increase of the flow resistance of IV control rod step-down average velocity decreases and step-down time increases correspondingly. There is an inflection point in the transient pressure curve and the pressure of the inflection point decreases gradually with the increase of the flow resistance. The pressure lag time after step-down also decreases. The research results lay the base for the design and optimization of the flow resistance of the IV for the CRHDS.

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