Design of Control System for Concrete Mixing Station

2013 ◽  
Vol 712-715 ◽  
pp. 2779-2782
Author(s):  
Shuan Ji Zhang ◽  
Yi Da Jiang ◽  
Min Zhe Zhang
Keyword(s):  
Control System ◽  
Water Discharge ◽  
Good Effect ◽  
Software Project ◽  
Programmable Logic ◽  
Pressurized Water ◽  
Simple Operation ◽  
Storage Technology ◽  
Temporary Storage ◽  
Concrete Mixing Station

This paper analyzes the concrete mixing station control system problems, puts forward the total design scheme, and designs the hardware and software of programmable logic controller. In the software project, focusing on the automatic run program, aggregate discharge procedures, two feeding procedures, alarm procedures. The design also uses intermediate temporary storage technology, pressurized water discharge technology. The experiments prove that the system is reliable, simple operation, convenient maintenance, good effect.

Dynamic Modeling of the NSSS Based on NHR200-II Nuclear Heating Reactor

2018 ◽  
Author(s):  
Zhe Dong ◽  
Yifei Pan ◽  
Miao Liu ◽  
Xiaojin Huang
Keyword(s):  
Control System ◽  
System Design ◽  
Dynamic Modeling ◽  
Primary Circuit ◽  
Control System Design ◽  
Plant Design ◽  
Pressurized Water ◽  
Nuclear Heating Reactor ◽  
System Verification ◽  
Nuclear Heating

The nuclear heating reactor (NHR) is a typical integral pressurized water reactor (iPWR) developed by the institute of nuclear and new energy technology (INET) of Tsinghua University, which has the safety advanced features such as the primary circuit integral arrangement, full-range natural circulation, self-pressurization. Power-level control is crucial for the operational stability and efficiency of the NHR, and the dynamic modeling is a basis for control system design and verification. From the conservation laws of mass, energy and momentum, a lumped-parameter dynamical model is proposed for the nuclear steam supply system (NSSS) based on the 200MWth nuclear heating reactor II (NHR200-II). The steady-state model validation is given by the comparing the parameter values of this model and that for plant design. Then, both the open-loop responses under the disturbances of reactivity and coolant flowrates as well as the closed-loop responses under the case of power ramp are given, where the rationality of the responses are analyzed from the viewpoint of plant physics and thermal-hydraulics. This model can be utilized for not only the control system design but also the development of a real-time simulator for the hardware-in-loop control system verification.

scholarly journals Variations in the Sliding of a Temperate Glacier

1974 ◽  
Vol 13 (69) ◽  
pp. 349-369 ◽  
Author(s):  
Steven M. Hodge
Keyword(s):  
Water Discharge ◽  
Ice Flow ◽  
Sliding Speed ◽  
Temporary Storage ◽  
State Of Stress ◽  
Basal Sliding ◽  
Internal Deformation ◽  
Pressure Melting ◽  
Glacier Flow ◽  
Basal Shear

Detailed measurements of the positions of stakes along the center-line of the lower Nisqually Glacier were made over a period of two years. Variations in the basal sliding speed were calculated from the measured changes in surface speed, surface slope, and thickness, using the glacier flow model of Nye (1952) and allowing for the effect of the valley walls, longitudinal stress gradients, and uncertainties in the flow law of ice. The flow is predominantly by basal sliding and has a pronounced seasonal variation of approximately ±25%. Internal deformation contributes progressively less to the total motion with distance up-glacier. Neither the phase nor the magnitude of the seasonal velocity fluctuations can be accounted for by seasonal variations in the state of stress within the ice or at the bed, and the variations do not correlate directly with the melt-water discharge from the terminus. A seasonal wave in the ice flow travels down the glacier at a speed too high for propagation by internal deformation or the pressure melting/enhanced creep mechanism of basal sliding.The rate of sliding appears to be determined primarily by the amount of water in temporary storage in the glacier. The peak in sliding speed occurs, on the average, at the same time as the maximum liquid water storage of the South Cascade Glacier. The data support the idea that glaciers store water in the fall, winter and spring and then release it in the summer. This temporary storage may be greatest near the equilibrium line. The amount of stored water may increase over a period of years and be released catastrophically as a jökulhlaup. Any dependence of sliding on the basal shear stress is probably masked by the effect of variations in the hydrostatic pressure of water having access to the bed.

Design of Single Roller Scutcher Control System Based on PLC

2012 ◽  
Vol 546-547 ◽  
pp. 795-799
Author(s):  
Yin Feng Wu ◽  
Jian Wei Liang ◽  
Ling Liang
Keyword(s):  
Control System ◽  
Control Level ◽  
Control Program ◽  
Programmable Logic ◽  
Design Development ◽  
Test Program ◽  
Speed Test ◽  
Plc Control ◽  
Development Cycle ◽  
Pressure Stability

This paper analyzes the control requirements of scutcher and introduces the control system scheme which is composed of programmable logic controller, touch panel and inverter. And it emphasizes the hardware constitution of S7-200 PLC control system, the pressure detection and display of cotton feeding pipeline, together with the principles of the beater speed test program and the control program of cotton feeding motor.The scutcher control system can feed cotton continuously and equably and ensure the pressure stability of the cotton feeding pipeline. In this way, it can adjust process conveniently, decrease fault rate and cut the design development cycle of new equipments to improve the control level of textile machinery.

Design of Control System for Concrete Mixing Station Based on PLC and Touch Screen

2011 ◽  
Vol 317-319 ◽  
pp. 2473-2476
Author(s):  
Huan Zhang
Keyword(s):  
Control System ◽  
Energy Saving ◽  
Touch Screen ◽  
Automatic Production ◽  
Construction Machinery ◽  
Practical Operation ◽  
And Control ◽  
Technology Processes ◽  
Control Accuracy ◽  
Concrete Mixing Station

On the basis of analyzing technology processes and control demands of concrete mixing station, a design of control system for this construction machinery based on SIEMENS S7-300 PLC and eView touch screen was introduced in this paper, including hardware selection, PLC LAD diagram programming and HMI design, etc. All expected demands for weighing, batching, deposit, mixing, unloading, conveying of the whole technology processes of concrete mixing are reached, and a totally automatic production can be realized also. The practical operation verifies that the control system is highly reliable and stable, and it greatly enhances the control accuracy and meets the equipments requirements of energy-saving.

Modeling of the motion control system of an unmanned tracked vehicle with onboard gear units

2021 ◽  
pp. 15-19
Author(s):  
Keyword(s):  
Control System ◽  
Internal Combustion Engine ◽  
Motion Control ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Control Device ◽  
External Control ◽  
Programmable Logic ◽  
Cruise Control ◽  
Tracked Vehicle

The results of a study of the control processes of an automated transmission and internal combustion engine of a transport unmanned tracked vehicle when the speed of movement is set by an external control device are presented. Keywords: unmanned tracked vehicle, algorithm, motion control, onboard gear unit, programmable logic controller, cruise control. [email protected]

Simple System Dynamics and Control System Project Models

2014 ◽  
pp. 113-133
Author(s):  
A. S. White
Keyword(s):  
Control System ◽  
Software Project ◽  
Software Projects ◽  
Initial State ◽  
Control Models ◽  
Non Linear ◽  
Dynamics And Control ◽  
Control System Model ◽  
System Project ◽  
And Control

This chapter examines the established Systems Dynamics (SD) methods applied to software projects in order to simplify them. These methods are highly non-linear and contain large numbers of variables and built-in decisions. A SIMULINK version of an SD model is used here and conclusions are made with respect to the initial main controlling factors, compared to a NASA project. Control System methods are used to evaluate the critical features of the SD models. The eigenvalues of the linearised system indicate that the important factors are the hiring delay time, the assimilation time, and the employment time. This illustrates how the initial state of the system is at best neutrally stable with control only being achieved with complex non-linear decisions. The purpose is to compare the simplest SD and control models available required for “good” simulation of project behaviour with the Abdel-Hamid software project model. These models give clues to the decision structures that are necessary for good agreement with reality. The final simplified model, with five states, is a good match for the prime states of the Abdel-Hamid model, the NASA data, and compares favourably to the Ruiz model. The linear control system model has a much simpler structure, with the same limitations. Both the simple SD and control models are more suited to preliminary estimates of project performance.

Variations in the Sliding of a Temperate Glacier

1974 ◽  
Vol 13 (69) ◽  
pp. 349-369 ◽  
Author(s):  
Steven M. Hodge
Keyword(s):  
Water Discharge ◽  
Ice Flow ◽  
Sliding Speed ◽  
Temporary Storage ◽  
State Of Stress ◽  
Basal Sliding ◽  
Internal Deformation ◽  
Pressure Melting ◽  
Glacier Flow ◽  
Basal Shear

Detailed measurements of the positions of stakes along the center-line of the lower Nisqually Glacier were made over a period of two years. Variations in the basal sliding speed were calculated from the measured changes in surface speed, surface slope, and thickness, using the glacier flow model of Nye (1952) and allowing for the effect of the valley walls, longitudinal stress gradients, and uncertainties in the flow law of ice. The flow is predominantly by basal sliding and has a pronounced seasonal variation of approximately ±25%. Internal deformation contributes progressively less to the total motion with distance up-glacier. Neither the phase nor the magnitude of the seasonal velocity fluctuations can be accounted for by seasonal variations in the state of stress within the ice or at the bed, and the variations do not correlate directly with the melt-water discharge from the terminus. A seasonal wave in the ice flow travels down the glacier at a speed too high for propagation by internal deformation or the pressure melting/enhanced creep mechanism of basal sliding. The rate of sliding appears to be determined primarily by the amount of water in temporary storage in the glacier. The peak in sliding speed occurs, on the average, at the same time as the maximum liquid water storage of the South Cascade Glacier. The data support the idea that glaciers store water in the fall, winter and spring and then release it in the summer. This temporary storage may be greatest near the equilibrium line. The amount of stored water may increase over a period of years and be released catastrophically as a jökulhlaup. Any dependence of sliding on the basal shear stress is probably masked by the effect of variations in the hydrostatic pressure of water having access to the bed.

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