Papers by Keyword: Temperature Control

Abstract: In the summer of southern cities of China, the duration of high temperature becomes longer which requires stricter temperature control and crack prevention measures for mass concrete in construction. By using finite element method for unsteady temperature field and stress field a simulation is made for a pump station built in summer. The cement hydration velocity of this engineering is so high that makes the temperature control very difficulty. Through result analysis of different cases, some optimized measures which include surface preservation and water cooling are proposed. It has an important significance for concrete structure in the same area.

Abstract: As a new product of integration of mechanics and electrics, electric boiler is acomparatively environment-friendly and energy-saving heating equipment at the present time. For the electric boiler, the performance of intelligent temperature control will directly affect the effect of energy saving, satisfaction of consumers andthe competitive ability of products in the market. Temperature control with large timelag and disturbances is widely used in the production of industry and daily necessities.It is affected by many factors such as the control plant and production condition, so itis very difficult to build the accurate mathematical model. Thus, the conventionalcontrol method such as PID control can’t meet requirements. Fuzzy control instead of establishing a precise mathematical model by simulation comparison of electric boiler control objects have very good results

Abstract: The electric boiler as object controlloed has the characteristics of nonlinear, time-varying and large lag, and the temperature control system of it has been a challenge. In order to improve the control performance, a novel temperature control system was designed. The system consists of temperature controller, temperature acquisition, temperature display, serial communication, and warning circuit. The core controller was relized by DSP 2407, which can execute advanced control algorithm. A hybird control algorithm was presented, which mergeed PID and fuzzy control. Simulation experiment of PID and presented algorithms were carried on respectively, and the simulation results showed that the system designed has good dynamic and still performance. Furthermore, the system is simple and has a certain application value.

Abstract: In the thesis the adaptive ability of neural network strong and good nonlinear approximation ability, A controller is designed based on BP neural network by the adaptive ability of neural network strong and good nonlinear approximation ability in this paper, this method changed defect of the usual PID controller that parameters of annealing furnace condition are not easy set and the ability to adapt is poor. The new method is not only has good stability, but also has high control precision and strong adaptability.

Abstract: Vacuum annealing is an important part in rare metal tube production, accurate control of the annea ling temperature has enormous influence on the quality of tubes.According to the technological characteristics and temperature control requirements of the vacuum annealing furnace ,a high precision temperature control system was built based on IPC, intelligent temperature controller and thyratron transistor power-regulator.The neural network-PID strategy was proposed to control temperature online through OPC interface, which realized accurate control and automatic detection of the whole process of annealing temperature. Field data indicates that this system has realized the accurate control of the vacuum annealing temperature, effectively improves the quality of rare metal tubes and has extensive application value.

Abstract: Temperature is the main environment parameter to industrial and agricultural production. To timely and accurate measurement is having great significance. A lot of production equipment, thermal equipment and large warehouse need for temperature measurement. Therefore, design a kind of ability of temperature automatic detection system has widely application value. This design is mainly on the Labview virtual instrument platform to develop a temperature acquisition system. We use good interface of Labview for data acquisition which is real-time display data in Labview. It can realize serial port function and will transfer to PC owners system. The data collected in the Labview environment for data processing and analysis, and it can accord the analysis of the results to control the singlechip microcomputer temperature.

Abstract: According to the arrangement of laminar cooling equipment in Desheng 1150mm hot strip mill, two-dimensional finite difference method has been used for coiling temperature online control model basing on the analysis of heat transfer characteristics, practical data are used to optimize water heat coefficient for self-learning as amended, this model are used to calculate the steel temperature change and distribution in the process of laminar cooling. Analysis of different cooling strategies on the cooling rate and organization of steel show that: In the same number of opened cooling tubes, the cooling capacity is not the same in the different strategies, the cooling to back direction is the strongest, followed by intermittent cooling, the cooling to front direction is the smallest. Cooling strategy was applied to the scene and simulated results match with the actual observation. The system has a wide range of cooling rate adjustment, the operation and control is well, which meet to the development and the requirements of new varieties.

Abstract: large-scale temperature stability control method is studied in this paper. In the process of large-scale temperature control, the stability of control is a very important indicator. To this end, this paper proposes a large-scale temperature stability control algorithm based on hierarchical control method. Balance equation of large-scale temperature stability control is created for the effective transmission of control data. According to the constant control theory, large-scale temperature stability control system design is achieved. Experimental results show that the proposed algorithm for large-scale temperature stability control system design, can greatly improve the stability of control, and get the satisfactory results.

Abstract: Aiming at the water bath temperature control system of great inertia, pure time-delay, non-linear and time changeable characteristics, a kind of simple and practical control algorithm is put forward in this paper：ITGC (Intelligent Track Guiding Control). ITGC and PID control system was carried out respectively step response test and the disturbance test in the MATLAB/SIMULINK simulation platform; And can be successfully applied in practical projects. Studies have shown that: ITGC control on the overshoot and adjustment time are better than the conventional PID method, the control scheme has stronger robustness and anti-jamming capability under various operating conditions and an increase in external disturbance case. Successfully resolved the difficulty of time-varying parameters and large lag in the temperature control system.

Abstract: A comprehensive set of experiments used to study the temperature distribution inside the chamber of a heat treatment furnace is presented, considering the surface and the core of steel SAE 8640 samples. The objective is to evaluate the best control strategy in order to achieve a better uniformity between the temperature of the core and the surface of the part with the desired temperature of treatment.