Ma Shuying

Design of a new measurement and control system of CO 2 for greenhouse based on fuzzy control

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 modular structure is used for system hardware and software design, enhance the versatility and flexibility of the use of system. The application shows that the carbon dioxide measurement and control system achieved using fuzzy control is running stable, fast response, has broad application prospects.

The Construction of the Secondary Vocational Teachers Training System Based on 'Cooperation between School and Enterprise'

Vocational education teachers’ training is important for vocational education development. Although China’ secondary vocational education teachers’ training system has been set up and made considerable progress, there are some problems that can not be neglected during the teachers training. In this paper, the existing problems of the secondary vocational teachers’ training are introduced, and a new training system for the secondary vocational teachers based on ‘Cooperation between School and Enterprise’ is put forward. The system consists of three training levels of ‘teacher’s professional qualifications training’, ‘teacher improving training’ and ‘the backbone teacher’s training’. The training system emphasizes the training methods of the three trainings. The system accords with the current vocational education development situation, and it is helpful for sending the teachers’ comprehensive ability.

Research on the Science and Technology Innovation Ability of Undergraduates Based on the Fuzzy Evaluation Approach

Based on establishing scientific and rational science and technology innovation ability evaluating index system of the university student, a fuzzy comprehensive evaluation approach of the university student innovation ability synthetic evaluation has been established through establishing and weighing the evaluation index set, the index weight, the reviews set, the membership matrix and fuzzy comprehensive evaluation vectors. The method has overcome the shortcoming which the sole assessment method exists. And verifies through example, we provided one kind of newly and feasible method for synthetic evaluating innovation ability of university students.

Notice of Retraction Development of Multi-Span Greenhouse Measure and Control System

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 is the host of parameters gathered,and the slave of upper PC computer. The PC computer software is developed by configuration software,and the MCU software is developed by C51.The system can use single,and can the unify management of multi-span greenhouse by PC,it offers flexible integrated ,reliable operation and very easy in maintenance.

Theoretical Model and Loading Analysis of Crankshaft Fillet Rolling

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 and the correcting method by using the plastic coefficient is put forward: the selection of rolling load should not only rely on the structural parameters of crankshaft but also should consider of the influences of material properties, structural dimensions of crankshaft and rollers and layout situation of rolling cutters. Calculation and test verification is carried out by example of 480Q crankshaft. the calculating formulas of the limited rolling loads and the principle about selecting the rolling loads which is provided by this paper are propitious to turn away the situation of ldquono evidence to rely onrdquo in selecting loads of rolling equipments at present.

The Student-Oriented Teaching Reform of Engineering Testing Technology

This paper begins with an analysis of present teaching conditions of Engineering Testing Technology. Aiming at the problem in the course teaching, in order to adapt teaching request, and guarantee the quality of teaching, and arouse student’s study enthusiasm fully, and raise student’s project practical ability, this paper carries on the reform exploration in the course content, the teaching method, the experiment teaching and the inspection way, and so on, and makes the good teaching progress.

Design of the temperature control system of solar cell lamination machine

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 core is introduced in this paper. Based upon the system, the expert PID was designed to adjust the requirements of the temperature control. The method can adjust the temperature parameters and establish an accurate laminating temperature under the condition of changing temperature and different control targets. The practical operation results show that the controller has a better robustness and a higher control precision. In addition, it can adapt to an external changing condition, and has a strong anti-jamming capability.

Research on control and management system of solar cell laminators based on network platform

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 an integration of solar cell laminating, real-time monitoring and production management. On the condition of large-scale laminators, using network to control and manage the lamination has a broad prospect of development.

An Optimal Design Method for Fillet Rolling

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. Velocities of contact-arc on journal and the corresponding point on roller are described by mathematic functions. By drawing line graph about contact-arc velocity between rolling tool and work piece, analysis on kinematics matching is executed. In order to enhance surface quality, reduce heating value, bring down power loss and achieve the double effect of rolling and polishing, the optimal mathematical model by taking minimum sliding friction as objective function and by taking crankshaft rotating speed, radius of roller and Strutting angle of roller as design variables. Solving is carried out by method of penalty function of interior point and by taking 480 crankshaft as an computational example and satisfying polishing effect is received.

A New Weighted Average Method and It's Applications in Finite Element Method

In many problems about stationary or time-variant physical fields of 2D plane or 3D space, application of Lagranges 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 based on the physical meaning of interpolation is deduced succinctl by this paper. The equations of this method possess the special and uniform format i.e. row vectors of coefficient matrix and that of the right side of the equations have the same format. Therefore, weighted coefficients are easy to be gotten with the aid of Cramers rule and then interpolation polynomial is obtained easily. Methods suggested by this paper avoid cockamamie steps in process of constructing interpolation basis functions repeatedly and also avoid complex iteratively solving process of linear equations about polynomial coefficients efficiently. Compared with Lagrange or other traditional interpolating methods which rely on seeking interpolating basis functions or solving equations directly, the weighted average method suggested by this paper is both simpler in deduction and more significant in physics. Furthermore, the weighted average method is also applied into shape functions’ derivations of triangular element and quadrilateral isoparametric element so that the correctness of this method is gained verification. At the same time, from view of deduction process, the method of this paper not only possesses simple deducting steps because of no solving linear equations which takes 6 undetermined coefficients as unknown quantities, but also takes on distinct meaning in physics and geometry and so it is easier to make people understand the cause of shape function in finite element method.