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In order to adapt the needs of development of multi-span greenhouse,the monitoring system of greenhouse environment parameters is developed, such as temperature, humidity,carbon dioxide concentrations and soil moisture content.The system uses modular design of the master-slave structure.The measure and control instrument takes a new and dual serial single chip microcomputer STC12C5A60S2 as core,it...
An image detection system based on DSP is designed for the length of vehicle queue at crossroad. The whole hardware structure of the system is described firstly, and the circuitry to process image by DSP is detailed. Also, the main program of the image detection system and the multi-threshold extraction method for the vehicle queue length are presented in the paper. By applying the system to the urban...
A greenhouse carbon dioxide concentration measurement and control system is designed based on fuzzy control with infrared carbon dioxide gas sensor, and the choice of the control structure parameters are given. According to the experience, the main points of the design of control rules are induced, and the carbon dioxide concentration fuzzy controller is constructed with relevant fuzzy logic. The...
Teachers are the utmost important resource of the education, and their quantity and quality have direct relation to the scale and speed of the educational development. So does the secondary vocational education. We have been exploring appropriate teachers' education and training pattern for the secondary vocational school. The system of the teacher education and training is being improved gradually...
To obtain high quality and high ratio of performance to price of the control system of solar cell lamination machine, and improve temperature control precision, double Microcontroller Unit (MCU) parallel control system was designed, used expert PID control algorithm, which can make the system get a further improvement on dynamic and static quality. In addition, a series of hardware and software measures...
As for large-scale solar cell laminators, a new type of control and management based on the network was produced. Firstly, an acquisition and control system was established upon the IPC and FP21 controller. And then, using Brower/Server (B/S) structure, the OPC technology and real-time database technology, a measurement and control system with integration of detecting was designed, which could make...
The temperature control is the key step in the laminating process of solar cell lamination machine. The traditional controlling method is PLC temperature control. The method being used has some shortages such as high price, low control precision, and so on. In order to improve the control precision and its performance-price ratio, a new control system taking the double microcontroller (MCU) as its...
In many problems about stationary or time-variant physical fields of 2D plane or 3D space, application of Lagrange's interpolation is very difficult. Because the purpose of interpolation is to predict function value of unknown points according to that of known and limited points, a new method of polynomial interpolation named as weighted average method is suggested and linear equations about weights...
On the basis of analysis of mechanism about crankshaft fillet rolling, the sliding motion in rolling process is classified into elastic sliding caused by elastic deformation of material and geometry sliding caused by geometrical shape and relative position of sliding pair. Aiming at the issue of sliding in crankshaft rolling process, the kinematical model of fillet rolling machining is established...
In this paper, the equivalent mechanics model of strengthening crankshaft fillet through the rolling process is established. The calculation formulae of limit rolling load are deduced by considering of the influence of structural parameters of crankshaft and rolling cutter, layout situation of rolling cutter and material property parameters. The relationship between rolling load and stress is studied...
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