Advanced Materials Research Vols. 889-890

Abstract: This paper focuses on the overall implementation process of RLC Layer in the Terminal Side of TD-LTE, which is based on the Nucleus Plus operating system. It contains primitive processing procedure and the realization of RLC layer entry function, which contains multi-instance module and state machine processing module. This helps to learn RLC layer and grasp the overall protocol stack.

Abstract: Combined with practical research project, a novel discharge method using high voltage pulsed power technology was put into practice for a special kind of underground sonic source device. The sonic source guaranteed large power as well as broad and thick sonic wave. Simulation as well as field test confirmed the correctness and effectiveness of the design method.

Abstract: This paper studied the in-band frequency modulation technology based on fractional-N PLL, first elaborated the basic principle and transfer function analysis of FM PLL, and according to the fractional-N theory gives the realization principle and the concrete algorithm of the modulation signal frequency in the loop modulation loop bandwidth of PLL, gives the design of key circuit, and the result shows that the technology can realize the frequency of modulation signal low to the DC, and high precision modulation, good frequency stability.

Abstract: The data parallel implementation scheme of zero-order interpolation and first-order interpolation of backward mapping is proved and discussed. It is shown that the complexity of data parallel implementation scheme presented in this paper is Ο(M+N) instead of Ο(MN) in sequential processing, thereby it can easily meet the real time requirements of the digital image processing.

Abstract: This paper analyzes the function of chirp. A design solution based on SOPC technology chirp signal put forward after the function had been studied both the hardware design and implement method. The chirp signal generator based on SOPC is designed according to the design process of Matlab/Simulink/DSP Builder/ QuartusII. The generator can produce the chirp signal well which is verified by the Matlab/Simulink and QuartusII. The starting frequency, bandwidth, and frequency resolution of chirp signal can be revamped by utilizing SOPC technology. This method is easier to implement since it is simple to design, easy to modify, low cost, no programming.

Abstract: This paper presents a new approach for making a four bit priority resolution circuit using current mode winner Take all (WTA) analog computation cells, the winner-takes-all circuit is employed to evaluate the highest input among a set of competing inputs and inhibit the others. This circuit consists of an input stage, a current mode Lazzaros WTA circuit and an output stage consisting of current mirror and load resistor. This circuit is compact, consisting of a total of 28 transistors including the input stage, and a good linearity is observed in response. Simulation of proposed circuit is performed on cadence virtuoso software in 0.18 μm CMOS process technology.

Abstract: Actuators made of giant magnetostrictive materials (GMM) have good application prospect in the precise driving. Because characteristics of GMM are very sensitive to temperature, the coil thermal effect will cause phenomenon of heat expansion and cold contraction in GMM, which affects the precise displacement output of the actuator. Coil skeleton and water cooling system are installed between the coil and the GMM rod in this design. The effect of water cooling system on the coil temperature rise is experimental studied. It is found that water cooling system can effectively reduce the influence of the coil temperature rise on displacement output of the GMM rod. Water cooling system has greatly improved the coil operating temperature when current is low, while cooling effect is not big for the larger current. That is because the coil heating is strong and the water can not immediately take away the heat. But coil temperature rise is still limited in allowable range. Thus, experiment results show that water cooling system can effectively ensure output precision of the GMM actuator.

Abstract: Electromagnetic components with coils, soft and hard magnetic materials of different power are assembled in modular joints, the coupling of magnetic fields in which has impact on other electrical components. The electromagnetic field of joint studied in this paper is mostly from the motor and safe brake. Firstly, the electromagnetic field of torque motor is analyzed by 2D model, the electromagnetic fields produced by coil current and permanent magnet are compared, the results show that the field produced by coil is much smaller, which can be omitted in the 3D model. The coupling electromagnetic field of torque motor and safe brake is analyzed by simplified 3D model; the field distribution curve is built with position change. Calculating the field distribution can be used to properly design the placement of electrical components such as sensors to avoid the magnetic interference. The experiment shows that adjusting the position according to the analysis results can solve the problem of magnetic encoder instability.

Abstract: Make use of programmable logic controller (PLC) to control stepper motor to drive the lift of seals of the hydraulic support eccentric loading test bench, in order to make the test bench meet the demand of eccentric loading. Using the Mitsubishi FX series PLC as an example, introduce the methods and principles and realization of lifting action.

Abstract: Electro-hydraulic control system of hydraulic support in addition to being able to control the basic movements of hydraulic support, also can work for signal acquisition of mining environment, including pressure of column pressure, displacement of push lutetium and pull support etc. The electro-hydraulic control system is presented in this paper, on the basis of the original control function added signal acquisition module, and designed the hardware and software.