scholarly journals A Study of the Pneumatic Counterweight of Machine Tools Conventional and Active Pressure Control Method

2006 ◽  
Vol 49 (3) ◽  
pp. 890-896 ◽  
Author(s):  
Ming-Hung TSAI ◽  
Ming-Chang SHIH
Keyword(s):  
Machine Tools ◽  
Control Method ◽  
Pressure Control ◽  
Active Pressure

scholarly journals Stable Switching Control Strategy of the Support Pressure and Velocity of Shield Machine Gripper Shoes

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Nannan Liu ◽  
Jishen Peng ◽  
Liye Song ◽  
Pinhe Wang ◽  
Kun Zhang
Keyword(s):  
Position Control ◽  
Control Method ◽  
Control Strategies ◽  
Pressure Control ◽  
Surrounding Rock ◽  
Support Pressure ◽  
Hydraulic Pressure ◽  
Compound Control ◽  
Hydraulic Servo ◽  
Shield Machine

An electro-hydraulic servo position and pressure compound control method was investigated considering the working principle of a hydraulic stepping motor of a shield machine gripper shoe and its practical working characteristics in the supporting process. The control targets were to improve the support efficiency and reduce the disturbance of gripper shoes on the surrounding rock. In this method, a fuzzy switching controller was used to switch between electro-hydraulic position control and electro-hydraulic pressure control. Numerical and prototype simulation experiments were conducted on the control method. The theoretical analysis and experimental results showed that the control method could effectively convert the gripper shoes from an unsupported state to a supported state in a short amount of time, as well as realize surge-free switching between position control and pressure control. Thus, disturbance of the gripper shoes on the surrounding rock could be reduced. The results of this study provide a theoretical basis for research on control strategies of hydraulic stepping propulsion of shield machines.

Research on the Key Technology of NC Abrasive Belt Grinding for the Leading and Trailing Edges of Aeroengine Blades

2012 ◽  
Vol 565 ◽  
pp. 76-81 ◽  
Author(s):  
Yun Huang ◽  
Xiao Xiao Ye ◽  
Ming De Zhang ◽  
Hong Wen Fang
Keyword(s):  
Control Method ◽  
Dimensional Accuracy ◽  
Pressure Control ◽  
Grinding Process ◽  
Belt Grinding ◽  
Key Technology ◽  
Abrasive Belt ◽  
Model Research ◽  
Trailing Edges ◽  
Blade Machining

This document provides an analysis of the structure characteristics and grinding process requirements of leading and trailing edges, and proposes a grinding process of leading and trailing edges, established a uneven grinding margin model, research the quantitative grinding pressure control method of uneven margin, as well as the error compensation technology of blade machining deformation, and experiments were carried out on the basis of theories above. The experimental results demonstrate that: after grinding, the edge roundness improved greatly, dimensional accuracy of edge radius can reach ±0.07mm.Compared with the traditional manual polishing method, the grinding quality improved significantly.

Control and Optimization of Negative Pressure in Scrap Copper Smelting

2011 ◽  
Vol 103 ◽  
pp. 399-403
Author(s):  
Ying Dao Li ◽  
Wei Hong Zhong ◽  
Hong Wei Guan ◽  
Xiu Shui Ma
Keyword(s):  
Pid Control ◽  
Negative Pressure ◽  
Control Method ◽  
Control Variable ◽  
Pressure Control ◽  
Copper Smelting ◽  
Smelting Process ◽  
Adjustment Process ◽  
Optimization Control

Negative pressure is the main control variable in scrap copper smelting process, the control of negative pressure is not only closely related with producing safely, but also produces a direct impact on the quality of the anode plate, it is also a key breakthrough in energy saving. This paper first analyses the characteristics of negative pressure control in scrap copper smelting process, aims to larger overshoot and longer regulation under conventional PID control method, and then utilizes fuzzy control to correct the PID parameters online, to achieve the optimization control of negative pressure. Simulation result shows that the adjustment process of optimized control of negative pressure is steady and rapid, usually no or slightly overshoot, and the settling time is also reduced significantly.

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