Distribution parameter modeling and experimental verification of constant-pressure variable displacement pump

2021 ◽  
Vol 13 (12) ◽  
pp. 168781402110671
Author(s):  
Zheng Yan
Keyword(s):  
Constant Pressure ◽  
Structural Parameters ◽  
Analytical Calculation ◽  
Pressure Control ◽  
Design Stage ◽  
Long Distance ◽  
Pressure Pump ◽  
Pressure Variable ◽  
Displacement Pump ◽  
Variable Displacement

To provide a precise model of dynamic components in the constant pressure pump, and to improve the accuracy of dynamic calculation of the constant-pressure hydraulic system in its design stage, the research undertook mapping on a particular constant pressure pump and determined its basic structural parameters. Then, with the AMESim software, the research adopted separate structures from the level of basic components to establish the model of single-piston pump, the model of variable displacement pump, and the model of adjustable mechanism for the swashplate, respectively. The three models were combined with the constant-pressure variable displacement pump before it was encapsulated in a super component. By controlling the flow discharge of the constant pressure pump, and by switching on and off the constant pressure valve with the internal and long-distance pressure control, the research undertook the simulative test and the corresponding experimental test on the characteristics of pressure response of the constant pressure pump. The results of both tests agreed well with each other. Thus, it verifies the precision of the established constant pressure pump model in performing accurately in response design and analytical calculation.

Robust Nonlinear Control of a Novel Indexing Valve Plate Pump: Simulation Studies

2002 ◽  
Vol 124 (4) ◽  
pp. 613-616 ◽  
Author(s):  
X. Zhang ◽  
S. S. Nair ◽  
N. D. Manring
Keyword(s):  
Pressure Control ◽  
Plate Motion ◽  
Nonlinear Simulation ◽  
Response Characteristics ◽  
Model Free ◽  
Swash Plate ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Robust Adaptive ◽  
Improved Performance

A robust adaptive pressure control strategy is proposed for a novel indexing variable-displacement pump. In the proposed approach, parametric uncertainties and unmodeled dynamics are identified to the extent possible using a model free learning network and used to decouple the dynamics using physical insights derived from careful reduced order modeling. The swash plate motion control is then carefully designed to provide the desired pressure response characteristics showing improved performance with learning. The proposed control framework and designs are validated using a detailed nonlinear simulation model.

The Research of Oil Pressure Fluctuation Influence to Rolling Mill Control Precision

2013 ◽  
Vol 330 ◽  
pp. 624-628
Author(s):  
Chun Ming Chen ◽  
Ya Jun Liu ◽  
Yun Xia Zhang ◽  
Dan Xia Guo
Keyword(s):  
Pressure Fluctuations ◽  
System Control ◽  
Hydraulic Control ◽  
Control Precision ◽  
Pressure Variable ◽  
Displacement Pump ◽  
Practical Engineering ◽  
Variable Displacement ◽  
Oil Source ◽  
And Control

Oil source made up of constant pressure variable displacement pump, accumulator, and pipeline is widely used to provide stable pressure for electro-hydraulic control system in practical engineering. Based on the experiment, the relationship between initial charging pressure & volume of the accumulator at inlet of the servo valve and control precision is analyzed in detail, and coupling rules between the load variation and the pressure fluctuations of oil-source are obtained, the rules can give reference for selecting initial charging pressure & volume of the accumulator according to the requirement of system control precision, which can further improve control precision and product quality by optimizing equipment parameters.

Robust Nonlinear Control of a Novel Indexing Valve Plate Pump

2001 ◽  
Author(s):  
X. Zhang ◽  
S. S. Nair ◽  
N. D. Manring
Keyword(s):  
Pressure Control ◽  
Plate Motion ◽  
Nonlinear Simulation ◽  
Response Characteristics ◽  
Model Free ◽  
Swash Plate ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Robust Adaptive ◽  
Improved Performance

Abstract A robust adaptive pressure control strategy is proposed for a novel indexing variable-displacement pump. In the proposed approach, parametric uncertainties and unmodeled dynamics are identified to the extent possible using a model free learning network and used to de-couple the dynamics using physical insights derived from careful reduced order modeling. The swash plate motion control is then carefully designed to provide the desired pressure response characteristics showing improved performance with learning. The proposed control framework and designs are validated using a detailed nonlinear simulation model.

Leakage Based Condition Monitoring and Pressure Control of the Swashplate Axial Piston Pump

2019 ◽  
Author(s):  
Neeraj Kumar ◽  
Bikash Kumar Sarkar ◽  
Subhendu Maity
Keyword(s):  
Hydraulic System ◽  
Pressure Control ◽  
Piston Pump ◽  
Chamber Pressure ◽  
Leakage Flow ◽  
Axial Piston Pump ◽  
Highly Nonlinear ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Axial Piston

Abstract This research mainly focused on the axial piston variable displacement pump, which is the most important part of the fluid power system. The variable displacement axial piston has been found as versatile and flexible for electro-hydraulic applications. Heavy industries such as automobile, aircraft, and mining use an axial piston pump due to its high power to weight ratio, continuous variable power transmission, low inertia, self-lubricating properties, and good controllability. The main challenges with the hydraulic system are highly nonlinear, leakages, unknown external disturbance, etc. The mathematical model of the variable displacement pump along with swashplate control has been developed. The model is used to identify the pump health condition with pressure and flow measurement, i.e., ripple pattern. The pressure and flow ripple will vary from the regular pattern due to wear and tear, i.e., increased leakage flow. The main source of the increase in leakage flow is due to wear in piston and cylinder bore. The piston chamber pressure, kinematical flow, and discharge area model of the pump has been validated with the existing results. The pump pressure control is very much essential for the enhancement of the performance of the electro-hydraulic system. In the present study, a conventional PID controller has been used as a backup to maintain system performance within the permissible faults. The electro-hydraulic system has been employed for swash-plate control of the pump to obtain desire pressure flow at the exit of the pump. MATLAB Simulink has been used for the simulation study of the pump.

Dynamic Analysis of a Variable Displacement Pump

1990 ◽  
Vol 112 (1) ◽  
pp. 122-132 ◽  
Author(s):  
G. J. Schoenau ◽  
R. T. Burton ◽  
G. P. Kavanagh
Keyword(s):  
Dynamic Performance ◽  
Critical Factor ◽  
Pressure Control ◽  
Control Signal ◽  
Hydraulic Control ◽  
New Techniques ◽  
Swash Plate ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Time Trace

The ability of a variable displacement pump to respond to a control signal is a critical factor in assessing the dynamic performance of the circuit in which the pump is located. The need for a comprehensive dynamic response model of the pump is necessary if new techniques for control are to be realized. This paper presents a mathematical model, based on fluid mechanics considerations, of a variable displacement pump modulated by a hydraulic control signal. Many of the coefficients in the model depend on the pump model. In this study, a Vickers No. PVB5 pump is used. The describing equations are complex, nonlinear, and comprehensive in the initial model. Some nonlinear terms are simplified using linear approximations without significantly affecting accuracy. The model is subjected to a simulated pressure control signal and the output of the swash plate rotary displacement compared to an experimentally generated displacement time trace. The model and the experimental results show a good correlation.

scholarly journals Fuel Flowrate Control for Aeroengine and Fuel Thermal Management for Airborne System of Aircraft—An Overview

2021 ◽  
Vol 12 (1) ◽  
pp. 279
Author(s):  
Dong Li ◽  
Jie Hang ◽  
Yunhua Li ◽  
Sujun Dong
Keyword(s):  
Thermal Management ◽  
Pressure Difference ◽  
Constant Pressure ◽  
Control Valve ◽  
Future Directions ◽  
Survey Paper ◽  
Fuel Flow ◽  
Displacement Pump ◽  
Tank System ◽  
Variable Displacement

Fuel flowrate control system and fuel thermal management are very important for aeroengine and the overall aircraft, and it has been researched for several decades. This survey paper makes a comprehensive and systematic overview on the exiting fuel flowrate regulation methods, thermal load of fuel metering units, fuel-based thermal management, and the fuel tank’s thermal management topology network with drain and recirculation. This paper firstly reviews the mechanism, technical advantages, and technical challenges of the fuel metering unit with flowrate control valve and constant pressure difference valve compensator, flowrate control valve and variable displacement pump-based pressure difference compensator, and motor-based flowrate regulation. Then, the technical characteristics of above fuel flowrate control methods related to thermal management are discussed and compared. Meanwhile, the behaviors of recirculated fuel flow within single tank system and dual tank system are explored. Thirdly, the paper discusses the future directions of fuel flowrate control and thermal management. The survey is significant to the fuel flowrate control and fuel thermal management of the aircraft.

The Character Research of Oil Source with Load of Rolling Screw System

2012 ◽  
Vol 184-185 ◽  
pp. 743-747
Author(s):  
Chun Ming Chen ◽  
Jia Liu ◽  
Li Xu
Keyword(s):  
Energy Source ◽  
Control System ◽  
Constant Pressure ◽  
Frequency Variation ◽  
Hydraulic Control ◽  
Pressure Variable ◽  
Displacement Pump ◽  
Practical Engineering ◽  
The Stability ◽  
Oil Source

Oil source made up of constant pressure variable displacement pump, accumulator, and pipeline is widely used to provide stable pressure for electro-hydraulic control system in practical engineering. The control system is non-linear and real-time, each part of which is interactive, a simulation model of energy source system is built, which includes constant pressure pump, accumulator and pipeline and load by means of AMESim software. Based on the simulation and experiment, the relationship between the load frequency variation and the pressure fluctuation of oil-source are obtained, the research provides support on how to confirm the equipment parameter properly, improve the stability of energy source system and enhance the control precision by reasonable confirming the equipment parameter.

The Dynamic Characteristics Research of Oil Source with Load of Rolling Mill

2012 ◽  
Vol 271-272 ◽  
pp. 1700-1704
Author(s):  
Chun Ming Chen ◽  
Li Zhen Feng ◽  
Jin Miao Jia ◽  
Yang Wang
Keyword(s):  
Control System ◽  
Constant Pressure ◽  
Frequency Variation ◽  
Hydraulic Control ◽  
Control Precision ◽  
Pressure Variable ◽  
Displacement Pump ◽  
Practical Engineering ◽  
The Stability ◽  
Oil Source

Oil source made up of constant pressure variable displacement pump, accumulator, and pipeline is widely used to provide stable pressure for electro-hydraulic control system in practical engineering. The control system is non-linear and real-time, each part of which is interactive, a simulation model of energy source system is built, which includes constant pressure pump, accumulator and pipeline and load by means of AMESim software. Based on the simulation and experiment, the relationship between the load frequency variation and the pressure fluctuation of oil-source are obtained, the research provides support on how to confirm the equipment parameter properly, improve the stability of oil source system and enhance the control precision by reasonable confirming the equipment parameter.

Feed Forward Plus Feedback Control of an Indexing Valve Plate Pump

2000 ◽  
Author(s):  
X. Zhang ◽  
S. S. Nair ◽  
N. D. Manring
Keyword(s):  
Feedback Control ◽  
Control Problem ◽  
Control Strategy ◽  
Pressure Control ◽  
Valve Plate ◽  
Pump Design ◽  
Feed Forward ◽  
Displacement Pump ◽  
Variable Displacement ◽  
On Line

Abstract A feed forward plus feedback pressure control strategy is proposed for an indexing variable displacement pump design. Insights into the dynamics are developed to determine performance characteristics and limitations, prior to control development, and a methodology is proposed to estimate some of the parameters on-line. Theoretical as well as implementation insights for the control problem are also developed.

scholarly journals Experimental Validation of a Hydrostatic Transmission for Community Wind Turbines

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 376
Author(s):  
Biswaranjan Mohanty ◽  
Kim A. Stelson
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Pressure Control ◽  
Speed Ratio ◽  
Hydrostatic Transmission ◽  
Design Flexibility ◽  
Power Capture ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Hydrostatic Transmissions

Hydrostatic transmissions are commonly used in heavy-duty equipment for their design flexibility and superior power density. Compared to a conventional wind turbine transmission, a hydrostatic transmission (HST) is a lighter, more reliable, cheaper, continuously variable alternative for a wind turbine. In this paper, for the first time, a validated dynamical model and controlled experiment have been used to analyze the performance of a hydrostatic transmission with a fixed-displacement pump and a variable-displacement motor for community wind turbines. From the dynamics of the HST, a pressure control strategy is designed to maximize the power capture. A hardware-in-the-loop simulation is developed to experimentally validate the performance and efficiency of the HST drive train control in a 60 kW virtual wind turbine environment. The HST turbine is extensively evaluated under steady and time-varying wind on a state-of-the-art power regenerative hydrostatic dynamometer. The proposed controller tracks the optimal tip-speed ratio to maximize power capture.

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