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Temperature Control System of Thermostatic Water Bath in Gravity-capillary Viscometer

Author: YangYanHua
Tutor: WangLuCai
School: Hunan Normal University
Course: Circuits and Systems
Keywords: Water bath Temperature Compound Intelligent Control Digital Temperature Sensor Error compensation
CLC: TP273
Type: Master's thesis
Year: 2010
Downloads: 65
Quote: 0
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Gravity-capillary viscometer to measure fluid viscosity equipment, which are widely used in petroleum, chemical fiber, food, medicine and many other sectors. Water bath is gravity capillary viscometer of the core components, the temperature accuracy, stability control is one of the key technologies for the instrument. In this paper, long Shawei Te Technology Development Co., commissioned by the project \water bath temperature control method of the status quo. To viscosity measurement national standard \fuzzy control and the organic integration of humanoid intelligent control, combined with DSP processor PWM control mode, constructed a composite intelligent temperature control method: When the target temperature and the actual temperature of the water bath large errors, the system uses an improved Bang-Bang Control to reduce the temperature rise time; when the target temperature and the actual temperature of the water bath error is small, the system uses self-tuning fuzzy control to minimize temperature overshoot; when the target temperature and the actual temperature of the water bath in a self-tuning fuzzy control error control dead zone, simulated intelligent control system uses self-tuning fuzzy control to reduce the steady state error. Through a large number of experiments show that this approach thermostatic bath temperature overshoot, steady speed, steady-state error ≤ 0.1 ℃, better than the national standard specifies the technical indicators. For water bath digital temperature sensor nonlinearity error exists, the establishment of an approach based on improved RBFNN integrated digital temperature sensor error compensation method: First, according to the error characteristics of digital temperature sensors and member network builder to construct multiple independent Sub-RBFNN networks, respectively, to complete each section of the sensor nominal range error compensation; estimator and then use the output weights regulator to determine the value of integrating the right conclusion, complete digital temperature sensor full scale non-linear error compensation, to obtain accurate measurements temperature results and verified by experiment the validity of this approach. Discusses the gravity capillary viscometer composition and working principle, design a water bath temperature acquisition and control module, human interface module hardware circuit, completed a complex intelligent control, digital temperature sensor linear error compensation software design. The temperature control system with heating and cooling functions, control range is 15-40 ℃, temperature sampling resolution of 0.01 ℃, temperature control accuracy of less than 0.1 ℃. These studies of gravity capillary viscometer constant temperature water bath laid the foundation for engineering applications.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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