scholarly journals Experimental Validation of a New Design Concept for the Increase of Efficiency of the Hydraulic Drive System in Mobile Working Machines

2021 ◽  
Vol 1097 (1) ◽  
pp. 012017
Author(s):  
S. Geffroy ◽  
A. Brautlacht ◽  
S. Wegner ◽  
S. Gels ◽  
K. Schmitz
Keyword(s):  
Experimental Validation ◽  
Hydraulic Drive ◽  
Drive System ◽  
Design Concept ◽  
Mobile Working

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.

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.

Adaptive Backstepping Control of the Gripping Process of Heavy Manipulators

2017 ◽  
Author(s):  
Lixin Yang ◽  
Xianmin Zhang
Keyword(s):  
Tracking Control ◽  
Hydraulic Drive ◽  
Adaptive Controller ◽  
Drive System ◽  
Uncertain Parameters ◽  
Backstepping Method ◽  
Nonlinear Characteristics ◽  
Cylinder Model ◽  
Stability Principle ◽  
The Stability

A valve-controlled asymmetrical cylinder model was established to study the gripping hydraulic drive system of the grip device of heavy manipulator. Due to the strong nonlinear characteristics and uncertain parameters of the model, the Lyapunov stability principle was used to design a multistage inversion adaptive controller based on backstepping method and by introducing the virtual control parameter. The simulation results reveal that the tracking control and adaptive of uncertain parameters are very effective, which confirm that the designed controller can guarantee the stability of the closed-loop clamping hydraulic drive system.

scholarly journals Online Monitoring Technique of Power Condition for Inverter-Fed Motor Driven Hydraulic System

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Lichen Gu ◽  
Yuan Shi
Keyword(s):  
Change Process ◽  
Hydraulic System ◽  
Frequency Conversion ◽  
Online Monitoring ◽  
Dynamic Change ◽  
Hydraulic Drive ◽  
Load Condition ◽  
Drive System ◽  
Dynamic Power ◽  
Term Operation

As a new type of global energy-saving transmission mode, frequency conversion hydraulic drive system has been widely used. Since hydraulic systems become more complex and transfer more power, operating accidents often occur unexpectedly. Therefore, online monitoring of the running state of the hydraulic system is significant during its long-term operation. The pressure, flow, and vibration signals obtained by traditional monitoring methods are nonstationary and susceptible to disturbance. In order to solve this problem, a method of monitoring power condition of the motor driven hydraulic system based on input voltage and current of the motor is proposed. The present study uses the amplitude and phase information of the voltage and current signals on the stator side of the AC motor to form a dynamic power circle graph and extracts feature information from the graph to monitor the power state and its dynamic change process of the hydraulic system. Results obtained from experiments conducted under different frequencies and loads indicate that the proposed method can realize the online monitoring successfully and effectively. Furthermore, the method has another advantage of monitoring the dynamic power change process of the hydraulic drive system and the power matching process between the motor and the system load condition in a visualized way.

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.

The Design Concept Application on RMS for Tail Drive System of Civil Helicopter

2011 ◽  
Vol 86 ◽  
pp. 120-124
Author(s):  
Wei Zhen Liu ◽  
Wen Qiang Ding ◽  
Yong Hong Wang
Keyword(s):  
Market Competition ◽  
Test Methods ◽  
Transmission System ◽  
Drive System ◽  
Design Concept ◽  
Maintenance Cost ◽  
Design Phase ◽  
Product Model ◽  
Detail Design ◽  
Concept Application

To raise the market competition ability of the civil helicopter, it is required to have high technical content in RMS including reliability, maintainability, safety, supportability and testability for the new generation civil helicopter. To meet the requirements of the civil helicopter, it is decided to follow strictly the maintenance matrix from the preliminary design phase of the transmission system. To decrease the maintenance cost, the structure will be optimized during the detail design phase and checked by DMU (Digital Mockup) in VPM (Virtual Product Model) system. And to get the high safety and reliability, some advanced design technical are applied and substantiated by some new test methods. This paper explains design concept application on RMS for tail drive system of the civil helicopter by showing some practice for an example. It can provide the method and reference for the development of civil helicopter transmission system.

Sign in / Sign up

Export Citation Format

Share Document