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.

scholarly journals Robust Diagnosis of Industrial Systems by Bond graph Model

2018 ◽  
Vol 7 (3.13) ◽  
pp. 55
Author(s):  
Abderrahmene Sellami ◽  
Dhia Mzoughi ◽  
Abdelkader Mami
Keyword(s):  
Hydraulic System ◽  
Graph Model ◽  
Research Problem ◽  
Causal Analysis ◽  
Bond Graph ◽  
Link Diagram ◽  
Linear Transformations ◽  
Sand Filter ◽  
Industrial Systems ◽  
Theoretical Results

This paper aims to solve a research problem by a robust diagnosis of a hydraulic system with sand filter by approach of graph of connection using fractional linear transformations (BG-LFT). The method we develop is based on the use of analytic redundant relations by a bond graph graph model (BG-ARRs). These relationships not only allow the detection and isolation of defects on the various elements of the system, but also the location by structural and causal analysis. The results suggest that the use of the link diagram model for a valve fault (eg an R1 valve is blocked), figures 9.a), 9.b) and 9.c) show that the residual models r1 and r2 become non-zero, so the flow and pressure levels are zero at reservoir C2. These values mean that these residues are sensitive to the variation of the flow rate at the level of the valve R1, which is confirmed by the theoretical results presented in table 2. The simulation of the system is carried out by the software dedicated to the bond graph approach 

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.

Stability Analysis of a Load-Sensing Hydraulic System

1988 ◽  
Vol 202 (2) ◽  
pp. 79-88 ◽  
Author(s):  
S D Kim ◽  
H S Cho ◽  
C O Lee
Keyword(s):  
Mathematical Model ◽  
Stability Analysis ◽  
Stability Criterion ◽  
Hydraulic System ◽  
Operating Conditions ◽  
Conventional System ◽  
System Parameters ◽  
Hurwitz Stability ◽  
Load Sensing ◽  
The Stability

The load-sensing hydraulic system is an energy saving hydraulic system which improves the efficiency of transmitting power from the pump to the load. However, its stability characteristics deteriorate critically due to the addition of the load-sensing mechanism, compared with those of the conventional system. In this paper, a non-linear mathematical model of the load-sensing hydraulic system is formulated, taking into consideration the dynamics of the load-sensing pump. Based upon linearization of this model for various operating conditions, the stability analysis has been made using the Routh-Hurwitz stability criterion. The results of the theoretical stability analysis were assured through experiments. Both results show that stability is critical to the choice of system parameters such as the setting pressure of the pump compensator and the load inertia.

Bond Graph Simulation and Test on the Working Hydraulic System of ZL50 Type Loader

2011 ◽  
Vol 127 ◽  
pp. 390-394
Author(s):  
Hui Wang ◽  
Fei Yang
Keyword(s):  
Modeling And Simulation ◽  
Hydraulic System ◽  
Graph Model ◽  
Bond Graph ◽  
Simulation Software ◽  
State Function ◽  
Control Engineering ◽  
Simulation Results ◽  
Graph Simulation ◽  
Working Device

Based on the modeling and simulation software 20-sim developed by Control Engineering Group in University of Twebte in the Netherlands, the bond graph model of the hydraulic system for the working device of ZL50 wheel loader was established. During simulating the model, with the main parameters of the model were set based on the actual test result, which can skip deriving state function and simulate the system directly with the results of pressure response. The simulation results show that this method is feasible and convenience in the application of hydraulic dynamic simulation. Further more, through the test of cylinder pressure when the loader in the practical work, by comparing with the simulation results, which provides a new way in the field of dynamic modeling and simulation for hydraulic system.

Bond graph model of a PEM fuel cell stack

2008 ◽  
Vol 1 (06) ◽  
pp. 329-334
Author(s):  
S. Rabih ◽  
C. Turpin ◽  
S. Astier
Keyword(s):  
Fuel Cell ◽  
Graph Model ◽  
Pem Fuel Cell ◽  
Bond Graph ◽  
Fuel Cell Stack

Based on the technology of electromagnetic force driving and differential pressure control for producing solder balls

2021 ◽  
Vol 286 ◽  
pp. 129236
Author(s):  
Tongju Wang ◽  
Yongping Lei ◽  
Peng Zhao ◽  
Jian Lin ◽  
Hanguang Fu
Keyword(s):  
Electromagnetic Force ◽  
Pressure Control ◽  
Differential Pressure ◽  
Solder Balls

Analysing integration issues of the microgrid system with utility grid network

2021 ◽  
Vol 22 (1) ◽  
pp. 113-127
Author(s):  
Mulualem Tesfaye ◽  
Baseem Khan ◽  
Om Prakash Mahela ◽  
Hassan Haes Alhelou ◽  
Neeraj Gupta ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Distribution System ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Operating Conditions ◽  
Control Mode ◽  
Voltage Source ◽  
Modulation Scheme ◽  
Main Challenge ◽  
Utility Grid

Abstract Generation of renewable energy sources and their interfacing to the main system has turn out to be most fascinating challenge. Renewable energy generation requires stable and reliable incorporation of energy to the low or medium voltage networks. This paper presents the microgrid modeling as an alternative and feasible power supply for Institute of Technology, Hawassa University, Ethiopia. This microgrid consists of a 60 kW photo voltaic (PV) and a 20 kW wind turbine (WT) system; that is linked to the electrical distribution system of the campus by a 3-phase pulse width modulation scheme based voltage source inverters (VSI) and supplying power to the university buildings. The main challenge in this work is related to the interconnection of microgrid with utility grid, using 3-phase VSI controller. The PV and WT of the microgrid are controlled in active and reactive power (PQ) control mode during grid connected operation and in voltage/frequency (V/F) control mode, when the microgrid is switched to the stand-alone operation. To demonstrate the feasibility of proposed microgrid model, MATLAB/Simulink software has been employed. The performance of fully functioning microgrid is analyzed and simulated for a number of operating conditions. Simulation results supported the usefulness of developed microgrid in both mode of operation.

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