LNG Tank Dome Air Raising Technology Research Based on Closed-Loop Tension Control

2014 ◽  
Vol 511-512 ◽  
pp. 569-572
Author(s):  
Wen Da Zhu ◽  
Jie Jiang ◽  
Gong Sheng Yang ◽  
Nan Jin Gao ◽  
Jing Peng Yan ◽  
...  
Keyword(s):  
Hydraulic System ◽  
Closed Loop ◽  
Control Device ◽  
Wire Rope ◽  
Tension Control ◽  
Control Technology ◽  
Technology Research ◽  
Efficient Energy ◽  
Lng Tank ◽  
Installation Technology

LNG gains popularity as a kind of clean and efficient energy, LNG tank dome air raising installation technology is a key problem for tank construction, chain preloaded is adopted in traditional balance guidance device, the wire rope tension cant maintain a constant in air raising, which brings great safety hidden trouble. In this paper, the tension control technology based on closed-loop was put forward, the tension control device was designed and the hydraulic system principle was designed. Tensioning force can be adjusted automatically in the air raising process by researching on LNG dome air raising technology based on closed-loop tension control. It is of great significance for improving the efficiency and safety in the process of air raising .

scholarly journals Pumping wells super flexible closed-loop control technology research and testing applications

2020 ◽  
Vol 1654 ◽  
pp. 012012
Author(s):  
Zhang Shengli ◽  
Wang Fang ◽  
Yang Song ◽  
Chang Penggang ◽  
Wei Siqi ◽  
...  
Keyword(s):  
Closed Loop ◽  
Closed Loop Control ◽  
Control Technology ◽  
Technology Research ◽  
Loop Control ◽  
Pumping Wells

scholarly journals APPLICATION OF THREE-DIMENSIONAL MODELING TO OPTIMIZE THE DIMENTIONS OF THE SPEED CONTROL DEVICE WITH ROTARY STOPPER IN THE FORM OF A CLOSED-LOOP HYDRAULIC SYSTEM

2021 ◽  
pp. 91-96
Author(s):  
Oleh Strilets ◽  
Oleh Malashchenko ◽  
Anton Stepaniuk
Keyword(s):  
Hydraulic System ◽  
Closed Loop ◽  
Three Dimensional ◽  
Control Device ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Speed Change ◽  
Gear Differential

The aim of this work is to create a three-dimensional model of a new speed change control device using an engineering CAD system Solidworks. In particular, the article describes the methods of computer construction of a three-dimensional model of a rotary stopper in the form of a closed-loop hydraulic system of the device for smooth control of speed changes through a gear differential. The control link can be either a ring gear, or a carrier, or a sun gear. Ways of creating new parts of the device, use of elements from standard libraries and coordination of their dimensions in assembly have been considered. The ability to parameterize the dimensions allows you to automate the creation of both a single part and the whole device of a particular design, based on the specified source data. The application of special meshes for modeling movable and fixed joints allows you to correctly place the parts, control the correctness of their assembly, and then conduct kinematic and power studies of the device, animate its elements in motion. It has been concluded that the use of computer three-dimensional modeling in the design of such stoppers allows: at the initial stage of design to get a visual idea of the stopper of rotational motion; use a computer to view the created model from any point; easy to edit three-dimensional models, i.e. make the necessary changes; achieve great savings in time and design costs; get a large number of possible design solutions that need to be analyzed in detail and in depth to choose the rational, i.e. the best fit. The created model of the stopper of rotational movement allows to choose the optimal place of its installation in a gear differential of the device of speed change from the point of view of use of the minimum sizes and volume. Based on this, computer simulation must precede design. Keywords: three-dimensional modeling; rotary stopper; closed-loop hydraulic system; gear differential

Torque Control of Electrorheological Fluidic Resistive Actuators for Haptic Vehicular Instrument Controls

2005 ◽  
Vol 128 (2) ◽  
pp. 216-226 ◽  
Author(s):  
M. A. Vitrani ◽  
J. Nikitczuk ◽  
G. Morel ◽  
C. Mavroidis ◽  
B. Weinberg
Keyword(s):  
Electric Fields ◽  
Closed Loop ◽  
Force Feedback ◽  
Haptic Feedback ◽  
Control Device ◽  
Torque Control ◽  
Feedback Mechanisms ◽  
Feedforward Loop ◽  
Integral Controller ◽  
Proportional Integral Controller

Force-feedback mechanisms have been designed to simplify and enhance the human-vehicle interface. The increase in secondary controls within vehicle cockpits has created a desire for a simpler, more efficient human-vehicle interface. By consolidating various controls into a single, haptic feedback control device, information can be transmitted to the operator, without requiring the driver’s visual attention. In this paper, the experimental closed loop torque control of electro-rheological fluids (ERF) based resistive actuators for haptic applications is performed. ERFs are liquids that respond mechanically to electric fields by changing their properties, such as viscosity and shear stress electroactively. Using the electrically controlled rheological properties of ERFs, we developed resistive-actuators for haptic devices that can resist human operator forces in a controlled and tunable fashion. In this study, the ERF resistive-actuator analytical model is derived and experimentally verified and accurate closed loop torque control is experimentally achieved using a non-linear proportional integral controller with a feedforward loop.

Research on Direct Tension Control of Underfeed Winder

2012 ◽  
Vol 203 ◽  
pp. 18-21
Author(s):  
Hui Fang ◽  
Wei Tang ◽  
Yan Jing Meng
Keyword(s):  
Load Distribution ◽  
Closed Loop ◽  
Pressure Control ◽  
Tension Control ◽  
Volume Control ◽  
Direct Tension ◽  
Dynamic Compensation ◽  
Compensation Control

The paper analyzes the method of direct tension control, provides repaired method of closed loop speed for tension control of underfeed winder, and designs the systematic hardware figuration and software to effectively meet the demands of different volume control. Furthermore, the problems including pressure control of pressing roller, load distribution control of two-drum winder, tension control of paper, and dynamic compensation control were analyzed and solved through the design of hardware and software of S7-300 PLC.

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.

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