Design and Efficiency Analysis of Closed Loop Pump Controlled Circuit Hydraulic Lifting System of Wheel Loaders Based on Gravity Self-Balancing Hydraulic Cylinder

2021 ◽  
Author(s):  
Xiangyu Wang ◽  
Hongjuan Zhang ◽  
Xiaogang Zhang ◽  
Long Quan
Keyword(s):  
Potential Energy ◽  
Hydraulic System ◽  
Closed Loop ◽  
Hydraulic Cylinder ◽  
Gravity Potential ◽  
Gravitational Potential Energy ◽  
Controlled Systems ◽  
Working Principle ◽  
Wheel Loaders ◽  
Lifting System

Abstract In the hydraulic lifting systems of wheel loaders, the valve controlled systems are used to drive the hydraulic cylinder to complete frequent lifting and falling operations. The gravitational potential energy of the lifting system, accumulated in the lifting process, is converted into heat energy through the throttling port of the valve during the falling processes, which results in significant throttling loss and severe system overheating. To solve the problems, a potential energy regeneration and utilization system is proposed, where the closed loop pump controlled circuit based on the gravity self-balancing hydraulic cylinder is adopted to eliminate throttling loss, and the gravity self-balancing chamber of the cylinder is directly connected with accumulator to recycle gravity potential energy. In the research, the structure and working principle of the proposed hydraulic system is analyzed first, then the co-simulation model and the test prototype are established to investigate the working and energy characteristics of the proposed system. Test results indicate that, compared with the traditional valve controlled hydraulic system, 58.9% energy consumption reduction can be expected for the hydraulic pump by adopting the proposed system under the same working condition.

The Air Controlled Hydraulic System Design of 3201z-Type Dump Truck Lifting Mechanisms

2011 ◽  
Vol 383-390 ◽  
pp. 1202-1207
Author(s):  
Tao Ping Yan
Keyword(s):  
Hydraulic System ◽  
Hydraulic Cylinder ◽  
Dump Truck ◽  
Gear Pump ◽  
Technical Parameters ◽  
Technical Performance ◽  
System Pressure ◽  
Working Principle ◽  
The Stability ◽  
Hydraulic System Design

3201Z-type dump truck is modification desiged by EQ3208GJ dump truck chassis which the technical performance parameters are known, and using a lifting mechanism of air controlled hydraulic system. By analyzing the composition and working principle of air controlled hydraulic system and referring to similar models, the design of the tank, the limiting mechanism and power taker are conducted. By calculating the main technical parameters, including in the performances of the hydraulic cylinder and the hydraulic pump, the dump truck's special oil cylinder HG-E180X780 and gear pump CBT-E563 are selected. By the stability of the piston rod, the system pressure and cars lifting time are checked; the reasonability and safty of the design can be proved.

Simulation Analysis of Synchronization Control for Ultrahigh Pressure Sterilization Equipment Based on AMESim

2014 ◽  
Vol 496-500 ◽  
pp. 1340-1343
Author(s):  
Gui Hua Fang ◽  
Xiao Yan Li
Keyword(s):  
Hydraulic System ◽  
Simulation Analysis ◽  
Hydraulic Cylinder ◽  
Synchronous Motor ◽  
Ultrahigh Pressure ◽  
Synchronization Control ◽  
Working Principle ◽  
Working Performance ◽  
Sterilization Equipment ◽  
Synchrony Measure

This paper introduces the working principle of the ultrahigh pressure sterilization equipment, the hydraulic system of hydraulic cylinder promoting the plug moving is analyzed by simulation, and then the hydraulic system added synchronous motor is analyzed by simulation, which found that the latter hydraulic system has higher synchrony measure , and it can improve the working performance of the original equipment, and it has certain reference significance to the improvement of the hydraulic system of the equipment.

Simulation Study of the Hydraulic System of Concrete Pumping Truck Based on AMESim

2012 ◽  
Vol 170-173 ◽  
pp. 1920-1925
Author(s):  
Chang Ge Fan ◽  
Fa Lin Zeng ◽  
De Hua Li ◽  
Lei Liu
Keyword(s):  
Simulation Study ◽  
Hydraulic System ◽  
Hydraulic Cylinder ◽  
Hydraulic Shock ◽  
Buffer Effect ◽  
Concrete Pumping ◽  
Working Principle ◽  
Simulation Results ◽  
The Relationship ◽  
Buffer Structure

The working principle of concrete pumping hydraulic system was analyzed. And base on the AMESim software, the complete simulation model of concrete pumping hydraulic system was built. A simulation was made to get the dynamic characteristics curve of hydraulic cylinder velocity and displacement at some specific conditions. The simulation results indicate that the model is reasonable. Comparative simulations of the pumping hydraulic system with different positions of buffer structure were carried out to study the relationship between buffer effect and the buffer position which can be used to provide theory basis for deeper study of the hydraulic shock.

Research on the Startup Control for the Closed-Circuit Hydraulic System Based on Expert Control Method

2007 ◽  
Author(s):  
Dongming Hu ◽  
Bing Xu ◽  
Huayong Yang
Keyword(s):  
Hydraulic System ◽  
Closed Loop ◽  
Control Method ◽  
Static Friction ◽  
Work Conditions ◽  
Friction Model ◽  
Closed Circuit ◽  
Expert Control ◽  
Working Principle ◽  
Startup Performance

The closed circuit hydraulic system is a typical nonlinear and time-varying system. In order to get excellent startup performance, the controller based on expert control method was designed. The theoretical and experimental research of the controller was carried out. Firstly, the working principle of the closed circuit hydraulic system was introduced. The difficulties of pressure pre-balanced control and closed-loop speed control for the system starting were indicated because of its friction, high-inertia and time delay. The influence of nonlinear friction on the startup performance of the system was analyzed. And the initial model of the friction was established through experiments. Then, the intelligent controller was designed basing on expert control method. The startup performance was evaluated by the integral of difference between the desired and the practical speed while the system ran. The static friction model and the parameters of the controller can be modified by the expert controller according to the last two results. Finally, experiments were carried out under different work conditions, namely variable loads and oil-temperatures. The results show that the startup performance of the system is excellent. The robustness of the expert controller is strong under different work conditions. That is, the proposed method is robust in the presence of nonlinearities and uncertainties.

The Air Controlled Hydraulic System Design of 3201z-Type Dump Truck Lifting Mechanisms

2012 ◽  
Vol 433-440 ◽  
pp. 3852-3857
Author(s):  
Tao Ping Yan
Keyword(s):  
Hydraulic System ◽  
Hydraulic Cylinder ◽  
Dump Truck ◽  
Gear Pump ◽  
Technical Parameters ◽  
Technical Performance ◽  
System Pressure ◽  
Working Principle ◽  
The Stability ◽  
Hydraulic System Design

3201Z-type dump truck is modification desiged by EQ3208GJ dump truck chassis which the technical performance parameters are known, and using a lifting mechanism of air controlled hydraulic system. By analyzing the composition and working principle of air controlled hydraulic system and referring to similar models, the design of the tank, the limiting mechanism and power taker are conducted. By calculating the main technical parameters, including in the performances of the hydraulic cylinder and the hydraulic pump, the dump truck's special oil cylinder HG-E180X780 and gear pump CBT-E563 are selected. By the stability of the piston rod, the system pressure and cars lifting time are checked, the reasonability and safty of the design can be proved.

Design of the Hydraulic System for Carrying Manipulator with 6-DOF

2014 ◽  
Vol 989-994 ◽  
pp. 2802-2806
Author(s):  
Min Wang ◽  
Cai Dong Wang ◽  
Hui Zheng ◽  
Guo Feng Fan
Keyword(s):  
Mathematical Model ◽  
Hydraulic System ◽  
Degrees Of Freedom ◽  
Assembly Line ◽  
Industrial Robot ◽  
Structural Parameters ◽  
Hydraulic Cylinder ◽  
Six Degrees Of Freedom ◽  
Output Force ◽  
Working Principle

According to the requirements for wheel hub assembly line, the structure and hydraulic system of carrying manipulator with six degrees of freedom (DOF) is designed. The working principle of the hydraulic system is analyzed. To minimize the output force of the hydraulic cylinder, a mathematical model of hydraulic cylinder output force and structural parameters is established. And then the manipulator structure is optimized based on Matlab software. The key components of the hydraulic system are selected. This research provides reference for design of similar hydraulic system of industrial robot.

The Simulation Analysis of Control Performance on Closed-Loop Control the Digital Hydraulic Cylinder

2013 ◽  
Vol 288 ◽  
pp. 219-222
Author(s):  
Dong Hai Su ◽  
Xin Li ◽  
Yue Ling Wang
Keyword(s):  
Pid Control ◽  
Closed Loop ◽  
Simulation Analysis ◽  
Hydraulic Cylinder ◽  
Control Performance ◽  
Fuzzy Pid Control ◽  
Loop Control ◽  
Working Principle ◽  
Response State ◽  
Close Loop Control

The working principle and design features of close-loop control digital stepping hydraulic cylinder were described, the ways to improve precision were analyzed. Base on the detailed analysis to response state of PID control, technology of fuzzy control and table the arithmetic of fuzzy-PID control was applied, which preferably satisfied control request.

Electric Scissor Aerial Work Platform Solenoid Valve Research

2013 ◽  
Vol 380-384 ◽  
pp. 177-180
Author(s):  
Guo Jun Pan
Keyword(s):  
Hydraulic System ◽  
Hydraulic Cylinder ◽  
Comprehensive Analysis ◽  
Solenoid Valve ◽  
Main Function ◽  
Working Principle

Electric scissor aerial work platform generally uses hydraulic cylinder to lift. The decline solenoid valve is an important part of the entire hydraulic system, which usually installed in the bottom of the hydraulic cylinder. The main function is locking hydraulic cylinder to prevent the platform sinking due to its weight, protect workers safety. This paper first introduces its structure and working principle, and then does the experiments such as resistance pollutants, leakage, and a comprehensive analysis of the decline in the performance of the solenoid valve.

Gravitational Potential Energy Recovery and Recycle of Rotary Drilling Rig Kelly Bar

2014 ◽  
Vol 635-637 ◽  
pp. 159-162
Author(s):  
Xiu Lei Li ◽  
Yong Wu
Keyword(s):  
High Pressure ◽  
Potential Energy ◽  
Gravitational Potential ◽  
Hydraulic System ◽  
Energy Recovery ◽  
Economic Benefits ◽  
Gravitational Potential Energy ◽  
Rotary Drilling ◽  
Drilling Rig ◽  
Engine Power

In order to improve the economic benefits of tunneling to rotary drilling rig ,in this paper ,the rotary drilling rig main winch hydraulic system was improved ,by increasing an hydro pneumatic accumulator storage and releasing gravitational potential energy of kelly bar ,as well as increasing reversing motor and the main winch motor to form a hydraulic transformer .So ensured the high pressure when the energy release and reduced the rotary drilling rig engine power ,what’s more ,this system’s feasibility had been verified by theoretical calculation .

Reliability of nonlinear stochastic controlled systems considering the dynamics of sensors and actuators

2021 ◽  
pp. 107754632110037
Author(s):  
Sun Jiaojiao ◽  
Xia Lei ◽  
Ying Zuguang ◽  
Huan Ronghua ◽  
Zhu Weiqiu
Keyword(s):  
Closed Loop ◽  
First Passage Time ◽  
Hamiltonian Function ◽  
Small Time ◽  
Kolmogorov Equation ◽  
Sensors And Actuators ◽  
First Passage ◽  
Controlled System ◽  
Main Structure ◽  
Controlled Systems

A closed-loop controlled system usually consists of the main structure, sensors, and actuators. The dynamics of sensors and actuators may influence the motion of the main structure. This article presents an analytical study on the first-passage reliability of a nonlinear stochastic controlled system under the consideration of the dynamics of sensors and actuators. The coupled dynamic equations of the controlled systems with sensors and actuators are first given, which are further integrated into a controlled, randomly excited, dissipated Hamiltonian system. By applying the stochastic averaging method for quasi-Hamiltonian systems, a one-dimensional averaged differential equation for the Hamiltonian function is obtained. The backward Kolmogorov equation associated with the averaged equation is then derived for the first-passage reliability analysis, from which the approximate reliability function and probability density of first-passage time are obtained. The accuracy of the proposed procedure is demonstrated by an example. A comparative analysis of the reliability of the system with/without sensors and actuators is carried out, which indicates that ignoring sensors and actuators will make underestimation of the reliability of the closed-loop system with small time. However, when time increases, there appears the opposite trend. Our findings provide a reference for control strategy design.

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