Simulation on Electro-Hydraulic Proportional Position Control System under Pressure Boundary Conditions

2011 ◽  
Vol 186 ◽  
pp. 21-25
Author(s):  
Jin Yu ◽  
Yuan Li ◽  
Xiao Kang Xu
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Boundary Conditions ◽  
Position Control ◽  
Step Response ◽  
Quick Response ◽  
Bode Diagram ◽  
The Mathematical Model ◽  
Pressure Boundary Conditions ◽  
Position Control System

Nowadays, the hydraulic straightening presses play an important role in straightening mandrels. For different mandrels, straightening forces and reductions differ. So the proportional position control system under pressure boundary conditions is required. The mathematical model of the system is deduced, and simulation of the system is carried out by MATLAB. The curves of step response and Bode diagram show that the system is steady and quick-response. The error caused by load is analyzed, which meets the straightening requirements and validates its design. The work in this paper can provide a high guidance for presses of similar kinds.

Position Control System of a Trunk in an Upward Airflow

2014 ◽  
Vol 657 ◽  
pp. 699-703
Author(s):  
Petru Gabriel Puiu ◽  
Daniel Drilea ◽  
Dragoş Iulian Nedelcu ◽  
Dragoș Andrioaia
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Physical Model ◽  
Position Control ◽  
Flow Simulations ◽  
Paper Work ◽  
Solid Works ◽  
The Mathematical Model ◽  
Position Control System ◽  
Made In

This paper work presents some aspects of modeling the behavior an object in an upward airflow with possible applications in pneumatic elevators. In the premises known from the literature, was formulated the physical model of corp behavior at air flow varying. In the first stage of the work, was completed in Solid Works the physical model and the functioning simulation in Flow Simulations. The imput data was provided in solving the mathematical model in Matcad 13. To achieve the control system was chose an open sources software solution with SCADA interface made in Pro wiew.

Research on Position Recognition and Control Method of Single-leg Joint of Hydraulic Quadruped Robot

2021 ◽  
Vol 14 ◽  
Author(s):  
Bingwei Gao ◽  
Hao Guan ◽  
Wenming Tang ◽  
Wenlong Han ◽  
Shilong Xue
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Pid Control ◽  
Control Algorithm ◽  
Position Control ◽  
Quadruped Robot ◽  
Identification Method ◽  
Indirect Identification ◽  
The Mathematical Model ◽  
Position Control System

: In order to obtain the precise mathematical model of the position control system of the hydraulic quadruped robot, and to meet the requirements of the system parameters in different stages of motion, this paper studies the position control system of the single-leg joint of the hydraulic quadruped robot: First of all, this paper uses the closed-loop indirect identification method to identify the position of the leg joints of the hydraulic quadruped robot to obtain the mathematical model of the system; And then, the speed PID control algorithm and speed planning algorithm are designed, so that the system can quickly respond to the changes of system input according to the requirements of different speeds; Finally, the joint position control system of the hydraulic quadruped robot is simulated and verified by experiments. Background: The mathematical model of the positioning system of the hydraulic quadruped robot is clear, but the parameters in the model have the characteristics of uncertainty and time-variation. In the joint position control system of a hydraulic quadruped robot, different motion stages have different requirements for system parameters. Objective: The purpose of this study is to obtain the precise mathematical model of the position control system of the hydraulic quadruped robot and to meet the requirements of the system parameters in different stages of motion. Method: This research takes the hydraulic quadruped robot single-leg system as the research object and uses the closed-loop indirect identification method to identify the position of the leg joints of the hydraulic quadruped robot to obtain the mathematical model of the system. Then, the speed PID control method is designed and compared with the ordinary PID control by taking the positioning control accuracy of the robot before touching the ground as a standard to carry out the controlled trial. Results: In this research, the identification method and control algorithm are designed, and finally, the simulation and experimental research are carried out. The results of the simulation and experiment verify the correctness of the identification method and the effectiveness of the control algorithm. Conclusion: First of all, this paper uses the closed-loop indirect identification method to identify the position of the leg joints of the hydraulic quadruped robot to obtain the mathematical model of the system. Then, the speed PID control algorithm and speed planning algorithm are designed so that the system can quickly respond to the changes of system input according to the requirements of different speeds.

Angular Position Control of Fluid-Driven Spindle

2009 ◽  
Author(s):  
Yohichi Nakao ◽  
Naoya Asaoka
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Steady State ◽  
Disturbance Observer ◽  
Position Control ◽  
Angular Position ◽  
Experimental Results ◽  
The Mathematical Model ◽  
Position Control System ◽  
State Error

A precise spindle is essential to achieve precision machining, such as diamond turning. A fluid driven spindle supported by hydrostatic bearings was thus designed and tested. A feature of the spindle is that several flow channels are designed in its rotor so that driving torque can be generated by supplying pressurized flow into the channels. Rotational speed of the spindle can be controlled by the flow rate. In addition, the rotational direction of the spindle can be controlled by switching supply ports. Thus angular position control of the spindle is achieved by designing appropriate feedback controller. In the present paper, mathematical model of the spindle was thus derived in order for designing an angular position control system. Then spindle characteristics calculated by the mathematical model were compared with experimental results. Furthermore, the angular position control system that has a disturbance observer in its feedback loop was designed based on the mathematical model. The performance of the designed control system was experimentally investigated through the step response. Experimental results verified that the designed controller minimizes the steady state error of angular position of the spindle. Consequently, the steady state error was comparable with the resolution of the rotary encoder, 0.018 degree. In particular, the experimental results indicated that the disturbance observer effectively reduced the influence of various load torque on the angular position of the spindle.

Research on the Servo Position Control System of the Carrying Manipulator Based on Pneumatic Drive

2012 ◽  
Vol 462 ◽  
pp. 748-752
Author(s):  
Mei Ning Zhao ◽  
Fang Wang ◽  
Miao Xin Dong
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Position Control ◽  
Heating Furnace ◽  
Pneumatic Drive ◽  
Molding Machine ◽  
Driving System ◽  
Control Character ◽  
Position Control System

Ammunition fuse shell is carried rapidly by the carrying manipulator from heating furnace to molding machine, so manipulator need accurate repeated position. The servo position control system is established to meet manipulator multi-point and flexible location based on pneumatic driving system. Linear mathematical model of the servo position control system is built based proper assumption, and model was used to analyze control system theoretically. The carrying manipulator can satisfy demands including decided order and positions; the control character is good by debugging.

Hydraulic Position Control System With Variable Speed Pump

2009 ◽  
Author(s):  
Hakan C¸alıs¸kan ◽  
Tuna Balkan ◽  
Bu¨lent E. Platin
Keyword(s):  
Position Control ◽  
Time Windows ◽  
Open Loop ◽  
Step Response ◽  
Feedback Signal ◽  
Test Results ◽  
Variable Speed ◽  
Set Up ◽  
The Mathematical Model ◽  
Position Control System

In this study, a valveless energy saving hydraulic position control servo system controlled by two pumps is investigated. In this system, two variable speed pumps driven by servomotors regulate the flow rate through a differential cylinder according to the needs of the system, thus eliminating the valve losses. The mathematical model of the system is developed in MATLAB Simulink environment. A Kalman filter is applied to reduce the noise in the position feedback signal. In the test set up developed, open loop and closed loop frequency response and step response tests are conducted by using MATLAB Real Time Windows Target (RTWT) module, and test results are compared with the model outputs.

Modelling and characteristics of a fluid-driven bi-directional motor for an angular position-control system

2010 ◽  
Vol 224 (4) ◽  
pp. 863-876 ◽  
Author(s):  
Y Nakao ◽  
M Ishikawa
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Water Flow ◽  
Cross Sections ◽  
Position Control ◽  
Water Pressure ◽  
Angular Position ◽  
Ultra Precision ◽  
Precision Machine Tools ◽  
Position Control System

A water-driven spindle was developed for use in ultra-precision machine tools. Features of this spindle are: (a) it utilizes water flow power to spin the spindle rotor and (b) it utilizes the water pressure to support the rotor. Bend flow channels are formed in the cross-sections of the spindle rotor so that the power of the water flow can be converted into driving power for spinning the rotor. This paper proposes a spindle structure similar to that of the water-driven spindle. A feature of the proposed spindle is that it can be driven in either rotational direction by switching the supply ports. By virtue of the feature of the proposed spindle, angular position control will become achievable by designing an appropriate control system. Prior to developing the angular position-controllable spindle, a testing device, named the fluid-driven bi-directional motor, was developed. This paper deals with the modelling of the motor that will be needed for designing the angular position control system. The derived mathematical model is then evaluated by comparison with the experimental results. It is then verified that the derived mathematical model is capable of representing the static as well as dynamic characteristics of the motor.

Application of Reduced Order Model to Automotive Engine Control System

1987 ◽  
Vol 109 (3) ◽  
pp. 232-237 ◽  
Author(s):  
E. Kamei ◽  
H. Namba ◽  
K. Osaki ◽  
M. Ohba
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Reduced Order Model ◽  
Step Response ◽  
Engine Control ◽  
Order Model ◽  
Reduced Order ◽  
Automotive Engine ◽  
Engine Control System ◽  
The Mathematical Model

This study deals with a multivariable automotive engine control system using a reduced order model. The system controls the engine torque and air fuel rate (A/F) simultaneously using linear quadratic (LQ) control theory. The mathematical model is obtained using a statistical identification method. The instrumental variable method is employed to estimate the parameters of the mathematical model. This model is reduced to an eighth-order one using minimal realization. A 16-bit microprocessor is employed for actual contruction of the control system, and a step response test was conducted. As a result, the system yielded a response similar to the simulation results.

A Model Improvement of a Supercritical Unit Coordination Control System

2013 ◽  
Vol 680 ◽  
pp. 488-494
Author(s):  
Hai Ming Niu ◽  
Zhong Xu Han ◽  
Huan Pao Huang ◽  
Hong Min Zhang
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Coordinated Control ◽  
Coordination Control ◽  
Model Improvement ◽  
Unit Coordination ◽  
The Mathematical Model ◽  
Controlled Object

Base on the mathematical model of a common coordinated control system in field of thermal, by analyzing characteristics of the controlled object supercritical once-through boiler coordinated control system, the article puts forward suggestions for improvement, and verifies the results of the analysis by test.

The Control of Vibration Transmissibility Using an Electrodynamic Actuator –Close-Loop Solution

2013 ◽  
Vol 436 ◽  
pp. 166-173
Author(s):  
A. Mihaela Mîţiu ◽  
Daniel Constantin Comeagă ◽  
Octavian G. Donţu
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Mechanical System ◽  
Closed Loop ◽  
Mechanical Systems ◽  
Vibration Transmissibility ◽  
Technical Solutions ◽  
The Mathematical Model

In this paper are presented some aspects of transmissibility control of mechanical systems with 1 DOF so that the effects of vibration on their action to be minimized. Some technical solutions that can be used for this purpose is analyzed. Starting from the mathematical model of an electro-mechanical system with 1 DOF, are identified the parameters which influence the effectiveness of the transmissibility control system using an electrodynamic actuator who work in "closed loop".

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