Proportional Pressure Control of Water Hydraulic System for Water-Assisted Injection Molding: Modeling and Simulation

2008 ◽  
Author(s):  
Zengmeng Zhang ◽  
Hua Zhou
Keyword(s):  
Injection Molding ◽  
Modeling And Simulation ◽  
Hydraulic System ◽  
Closed Loop ◽  
Injection Pressure ◽  
Pressure Control ◽  
Closed Loop Control ◽  
Load Characteristic ◽  
Loop Control ◽  
Water Hydraulic

The proportional pressure control of water hydraulic system for water-assisted injection molding (WAIM) is investigated through modeling and simulation. WAIM is an innovative process to mold plastic parts with hollow sections. A water hydraulic system is designed for WAIM and a differential pressure control strategy is provided to regulate the water injection pressure by a proportional relief valve. An accumulator and a pressure cylinder are applied in the system and modeled in MATLAB. The load characteristic is analyzed and the coupling relationship between load pressure and flow rate is approximately simulated. Based on the variable-parameter model with linearization, open-loop and closed-loop control with multi-point feedback are investigated. Integral compensation and PI control are used with slope control of injection pressure. In addition, the influence of load characteristic is also investigated. Results of the simulation show that the closed-loop control contributes to the stability and disturbance resistance performance under various load characteristics.

Research into the Variable Speed Pump Control System for Driving the Cutter Head of Shield Tunneling Machine

2009 ◽  
Vol 628-629 ◽  
pp. 257-262 ◽  
Author(s):  
Tong Xing
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Closed Loop ◽  
Control Method ◽  
Control Technique ◽  
Closed Loop Control ◽  
Variable Speed ◽  
Shield Tunneling ◽  
Loop Control ◽  
Cutter Head

The cutter head drive hydraulic system of φ1.8m simulate shield machine is introduced in this article, which has the variable speed pump control technique and the closed loop control method. The AMESim simulation model of the hydraulic system is built up, and the efficiency of the hydraulic system, speed control performance by open loop and closed loop control are analyzed. The result of the simulation shows that the variable speed pump control system has higher efficiency than the variable displacement pump control system about 4%-26% in the same condition when the cutter head speed is at the range of 0.5-4r/min, and the hydraulic system has good dynamic characteristics in closed-loop PID control.

Research on Airbags Overturning Device due to the PID Closed-Loop Control Technology

2013 ◽  
Vol 313-314 ◽  
pp. 395-398
Author(s):  
De Qiang Zhang ◽  
Li Ying Su ◽  
Duo Xing Zhao
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Pressure Sensors ◽  
Pressure Control ◽  
Closed Loop Control ◽  
Control Technology ◽  
Real Time Control ◽  
Loop Control ◽  
Time Control ◽  
Pressure Control System

Based on S7-200 PLC, pressure sensors and amplifiers, this paper uses PID instruction to establish the closed-loop pressure control system of the required thrust in turning airbags. So in the automatic overturning airbags, it is capable to real-time control the push rods running status.

Solidification sensing for closed loop control of injection molding hold time

1996 ◽  
Vol 15 (2) ◽  
pp. 151-163 ◽  
Author(s):  
Charles L. Thomas ◽  
Ampere A. Tseng ◽  
Anthony J. Bur ◽  
Joseph L. Rose
Keyword(s):  
Injection Molding ◽  
Closed Loop ◽  
Hold Time ◽  
Closed Loop Control ◽  
Loop Control
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