Papers by Keyword: Control

Abstract: Compared to current technologies, the advantages of the include : realizing the each and every terminal equipment's control and communication of the application of IoT on gas meter control system. Through the connection of IoT, the connection between the control terminal and gas meter terminal is no longer limited to the point-to-point control. It realizes the remote control of management and price adjustment, internet payment, cash amount settlement on the terminal gas meters, avoiding gas hoarding caused by the gas purchase volume calculation.

Abstract: To overcome the limitations of the independent stacked hybrid actuator with multiple sensors, a new hybrid linear actuator combines the advantages of both technologies: piezo actuator for extremely high accuracy and motorized stage for long travel ranges. A hybrid linear actuator prototype has been developed for testing in our satellite tracking antenna pointing control system. For the maximum absolute positioning accuracy, host positioning controller depends only on one common position sensor for both the coarse and fine positioning at the same time. Synchronization control scheme shows promising results for extremely small steps, high repeatability and good linearity over long travel ranges.

Abstract: The soil’s temperature plays an important role of soil ecology research. In order to gain and control soil’ temperature. A control system is proposed for soil’s temperature. And a new control algorithm which is based on the PID algorithm is designed in the control system to handle the complex change of the soil’s temperature. It does not need to know the mathematical model of soil’s temperature. At last, the control result is analyzed in this paper. The result shows that the soil’s temperature is controlled ideal by this control system which is accurate to 0.5°C.

Abstract: Nowadays, wire sawing becomes the most advanced brittle crystals slicing technology because of its advantages of slicing larger crystals ingots into very small thickness, high surface quality, high yield wafers. In the process, the thin wire, which is the processing tools, travels at high speed, and subjects to external excitation from many aspects. Wire saw tension control is the core and difficulty of the control system. Mathematical models of tension subsystems were studied. The control strategy of swing arm motor tension direct closed-loop combination of speed difference indirect closed-loop was proposed. The developed tension control hardware and software system reached the functional requirements and technical indicators, and constant tension precision control was solved effectively.

Abstract: The air separation part aims to clean up the air and separate air, it provides the demand gas for the factory. This process is automatically controlled by the progress which we code. The operating time and the valves reaction at each stage have strict requirements. If the operating time fails to meet requirements or the valve operations are improper, it will make the index of the air separation failed. Thus it will cause the whole process interruption and cause huge losses. Therefore, we must ensure that each valve operation of molecular sieve can be effectively controlled and monitored.

Abstract: For wind-induced vibration of transmission tower-line system, the vibration reduction effects are studied based on a new type steel-lead viscoelastic damper. Firstly, Calculate damped coefficient basing on the test of the new type steel-lead viscoelastic damper under slow reversed cyclic horizontal loads. Then, a finite element model of transmission tower was built by using ANSYS. And the time history samples of random fluctuating wind load is obtained with the linear auto-regressive filter law principle. Next, three installation plans of dampers on tower were proposed based on analyzing the working principle damper and the structure of tower. Finally, a wind-induced vibration transient response simulation was performed respectively for the different plans. The influences of SLVD dampers on the displacement and on the acceleration of the controlled nodes were compared. SLVD damper can reduce the top node displacement by about 37.89%. The results indicated that the SLVD damper can suppress the wind-induced vibration. And through comparison, the optimal installation scheme of SLVD dampers is obtained.

Abstract: At present most of the research is aimed at the end of the central air conditioning equipment, not considering the inner link between each component of the central air conditioning. In order to achieve economic operation of equipment and systems, to maximize energy saving of central air conditioning, we designed and implemented a monitoring system analysis which considered in the system more equipments linkage, multi parameter coupling, and a variety of factor. It collected energy consumption data of each device, to get the system running in typical operating conditions of the system by simulating the optimal process parameters and guide debugging critical control equipment.

Abstract: With the development of modern coal mining equipment, high-yield, high efficiency, high-speed mining technology was achieved, but also a sharp increase in the amount of dust generated in the mine at the same time, it damage workers health and bring insecurity to mine production. This paper has summarized the existing domestic and international prevention and control technology of dusts, elaborated mineral dust prevention and control work from the dust control, dust generation and dust diffusion three major aspects, and noted that the current technology trends.

Abstract: This paper presents design and control architecture of a small mobile robot with hybrid locomotion system. It consist the combination of wheel and track type motion system resulting as a hybrid mechanism. The wheel locomotion system helps the robot to move on flat surface or path platform with high velocity, high manoeuvrability at low energy consumption. The track system is designed for rough and unstructured path, where robot need to cross irregular surface with high stability. This system works on interchangeable locomotion phenomena by means of track tensioner unit (TTU). The TTU helps the loading and unloading of track system by means of rack and pinion mechanism. This design of small hybrid mobile robot is improves robot applications and also enhance its flexibilty, verstality to work in multi type of terrains.

Abstract: Even though actual composition of engine exhaust gases varies across diverse types of engines, such as gasoline, diesel, gas turbine and natural gas engines, engine exhaust temperature is always a major factor with strong impact on emission levels and catalytic converting efficiency. For spark ignition engines, exhaust temperature depends on various engine parameters, such as engine speed, engine load, A/F ratio, intake air temperature, coolant temperature and spark timing, etc. Due to complexity, it is impossible to share a unique analytical model of engine exhaust temperature. Instead, it is mostly modeled as a complicated nonlinear system. The model complexity increases significantly however accuracy cannot be guaranteed. On the other hand, a simple linear model with accurate system identification could serve as a versatile alternative to represent the engine exhaust temperature, while engine parameters are subject to model identification to be adaptable across different types of engines. Combination of linear functions in terms of dominant engine parameters of engine speed and engine load is used for exhaust temperature modeling. To identify optimal parameters, Markov Chain Monte Carlo (MCMC) is applied. The discrete-time Markov chain is introduced where the stationary probability replaces posterior density in Monte Carlo integration for numerical integration. Compared with the high order nonlinear approaches, low computation cost is involved in the simplified model. Good agreement between the model prediction data and testing results is observed. The approach could be easily extended to other types of engines.