Fu Zhang

Adaptive fuzzy PID temperature control system based on single-chip computer for the autoclave

The autoclave is one of main preparation equipments of crystal preparation by hydrothermal method. The preparation temperature will seriously influence crystals quality and crystals size at high temperature, how to measure and control precisely the autoclave temperature can be of real significance. The characteristic of hysteresis, nonlinearity and difficulty to acquire the precise mathematical model existing in the temperature control of the autoclave was researched. The general PID controller adopted usually in the autoclave temperature control system is hard to improve temperature control performance. Based on the advantages of fuzzy controller that does not depend on the precise mathematical model and the stabilization of PID controller, single-chip computer integrated fuzzy PID control algorithm is adopted, and the temperature system is designed, the foundational working principle was discussed. The control system includes SCM (AT89C52), temperature sensor, A/D converter circuit and corresponding circuit and interface, can make the autoclave temperature measure and control accurately. The system hardware includes main circuit, thyristor drive circuit, audible and visual alarm circuit, watchdog circuit, clock circuit, keyboard and display circuit so on, which can achieve gathering, analyzing, comparing and controlling the autoclave temperature parameter. The program of control system includes the treatment and collection of temperature data, the dynamic display program, the fuzzy PID control system, the audible and visual alarm program, et al, and the systems main software, which includes initialization, key-press processing, input processing, display, and the fuzzy PID control program was analyzed. The results showed that the fuzzy PID control system makes the adjustment time of temperature decreased and the precision of temperature control improved, the quality and the crystals size of the preparation crystals can achieve the expect experiment results.

Reconstruction of the abridged cloud data with long and narrow surface by Imageware software

The reason of cloud data with long and narrow surface lack was explored, and the reconstruction method was researched. In order to get the best reconstructed surface, the surface trend and the surface cloud data errors in different surface orders were compared during the process of surface reconstruction. The results showed that the reconstruction of cloud data with long and narrow surface lack was realized. The free surface was generated through sectional breakpoint cloud data which was cut by the cloud data nearby the lack cloud data. The surface of the original cloud data was obtained through the adjustment of control points of free surface. The reconstruction of cloud data with long and narrow surface lack was finished through the generation of surface to cloud data. The research will provide new methods for the defect of the cloud data to realize surface reconstruction, and the research on reconstruction of the abridged cloud data with narrow and long surface by Imageware software will provide theoretical foundation for development and application of reverse engineering.

Research on Traction Characteristics Model of High-Powered Tractor

Through an analysis of tractor traction balance, a mathematical model which can easily calculate the traction force and efficiency of tractors under different operating conditions was built up, this model offers a basis for tractor-implement matching. Bases on above analyses, the best efficiency rating value was deduced and the traction characteristic curve was also plotted, this study provides a theoretical basis for tractor traction characteristic research.

Data Exchange Method between ADAMS, CATIA and Solid Works Software

Three kinds of data transmission standards of IGES, parasolid and STEP on the SolidWorks and ADAMS software were contrasted to get the Parasolid for the most suitable software standards. CATIA 3D software has powerful function of modeling, but ADAMS has poor function of modeling. It has built the four feet completion institutions of 3D modeling by CATIA, then through among the middle media of SolidWorks software format to conversion and import CATIA 3D entity modeling into ADAMS/View environment to make up for the problem of insufficient ADAMS modeling ability. This paper focused on the discussion of data exchange process among ADAMS, CATIA and SolidWorks software.

The Model and Simulation of the Potato Harvester

The model of potato harvester was established by Solidworks software aiming to resolve the problems of low design efficiency and backwards design methods. The potatoes harvester included the chassis, the depth wheel, the dithering and elevating device, the digger blade, the universal joint, the suspension bracket, the gearbox, the tilting ring mechanism, the riddler, and so on. The virtual assembly and the simulation of potato harvester were researched by Solidworks software, and the motion and the assembly had not existed interference phenomenon when the model run the static and dynamic interference inspection. The results showed that the assembly and design of potato harvester will improve the design quality and efficiency and reduce the design cycle, and the research on the motion simulation of potato harvester will provide theoretical foundation for development and application of potato harvester.