Advanced Materials Research Vols. 291-294

Abstract: Data Acquisition System Based-on TMS320F2812 can quickly and easily for analog-digital converting, arbitrarily switching to 16 analog input channels. Serial Communication interfaces Make the system easy to use .The system is in design modular, can flexible debugging and modify.

Abstract: In order to increase the sensitivity, a new measuring method is proposed that two sensing fiber gratings change differentially modulated with a matching grating. The simulation of this method indicates that it can raise the sensitivity one time higher than that of a sensing fiber grating, as well as restrict the effect of temperature.

Abstract: This paper introduces digital control hydraulic variable pump based on mechatronic-hydraulic- air integration driven by compressed air. By inserting the toggle force amplifier in between double-acting rodless air cylinder and variable pump, this pump, driven by compressed air, utilizes small forced air to create big output power. The displacement of air cylinder piston is measured by using digitally linear displacement sensor and it is compared with input signal by computer in order to control pressure and flow rate output by hydraulic cylinder. This pump provides high flexibility and high reliability, simple structure and compact; it is easier to control by artificial intelligence and it will be widely used in the industry.

Abstract: An adaptive predictive controller is proposed to solve the time-varying characteristics of the industrial process control system. The arithmetic of implicit expression generalized predictive control（IGPC） is put forward to compute the optimal control signal increment. In order to decrease the computing work and increase the computing speed, the system input/output data are used to identify the controller parameters directly and the plant model parameters are unnecessary. Simulation results show that the controller can track the change of setting value excellently even though without any prior information of controlled system, and have excellent adaptive abilities for the changes of system external disturbing signals and model parameters.

Abstract: In order to suppress the noise in the magnetic flux leakage, the algorithm considering signal correlation, in which an optimal predictor and an optimal updater were chosen for every sample at all scales according to the magnitude of the correlation coefficient, was proposed. So the wavelets obtained through designing predictor and updater can perfectly fit the local features of signal. The actually processing effect of the simulation and the magnetic flux leakage signal of damage in wire rope show that the proposed method, compared with the classical wavelet, can effectively remove noise in original signal and principally retain the local features of the original signal.

Abstract: SPI (Serial Peripheral Interface) is a full-duplex serial communication interface bus. Now, many devices adopt SPI. However, in many other aspects, microcontroller and microprocessor have no SPI interface, data transmission is inconvenient. With the development of FPGA technology, the problem can be solved absolutely by the I/O port of FPGA. In this paper, after introducing the principle of SPI, we designed SPI interface with FPGA and implemented the communication between SPI interface and the device of CRG20 which has a SPI interface. The algorithm of design SPI interface through FPGA is implemented with VHDL. The results of simulation in Quartus II and FPGA simulation are also described. The SPI bus interface modules fulfill the goal demanded.

Abstract: As the development of the coal producing, the flexible rubber transfer with long distance, high speed and power were used in most of the high productive mines in China. However, large tension was caused by the high speed moving, which resulted in sliding. The large addition Displacement and shock was to influence the normal work. Therefore, a special design with controllable start is able to fulfill the requirement.

Abstract: On the basis of analyzing the structure and working principle of MRF brake, braking torque calculation formula of two disc MRF brake is established. Dynamic yield stress changing with the applied magnetic field is analyzed. Braking torque generated by MRF’s viscous changing with disk rotation velocity is also analyzed when magnetic field is zero. Furthermore; braking torque changing with magnetic field intensity is analyzed under a certain rotation velocity. The study provides a theoretical basis for MRF design.

Abstract: Digital open-loop fiber-optic gyroscope detection scheme based on sinusoidal phase modulation is introduced. A novel implementation of the detection scheme is developed with digital signal processor (DSP) and field programmable gate array (FPGA). The design and implementation of the detection system are discussed. Timing control and open-loop signal preprocessing are realized in FPGA. Rotation rate calculation is finished in DSP. Experiments result shows that good performances have been achieved and the implementation scheme is of great practical value.

Abstract: Based on the geometric relationship of the tetrahedron, 3-R target location theorem and calculation principle are given, and analytical model of locating built on distances between three stations and the target is put forward. In theory, we analyze its location precision and present its emulation about the precision. Besides, we give an analysis of some application examples on radar network and target tracking. This method is convenient to operate and easy to implement, without variable coupling.