Applied Mechanics and Materials Vols. 385-386

Abstract: In the field of fuzzy control, the generation of fuzzy control rules has always been a problem, because the industrial data is generally expressed in the order of time ,so it strongly depends on the time, it does not take the factors of temporal constraints into account in the previous extracting rule process.This paper uses temporal constraint association rule ,and uses the data mining methods to generate temporal fuzzy control rules. The method is verified by using the MATLAB7.1 ,the simulation shows that the method can achieve good fuzzy control rules.

Abstract: Taiankou is one of the most advanced semi-submerged ships in the world; it adopted an SSP electric propulsion system and a dynamic positioning technique with high technical content. Wuhan University selected Taiankou as a model ship for which to develop a set of marine electric propulsion simulation system. The paper introduces the composition, structure, functions and key techniques and main characteristics.

Abstract: An improved power flow control method of UPFC was proposed with consideration of the dynamic performance of dc capacitor: the line power flow was controlled based on current prediction in the series side, while the bus voltage and the dc capacitor voltage were controlled by the modulation ratio and phase shifting angle, respectively. The transient model of UPFC was established by Power System Analysis Software Package (PSASP) using its User Program Interface (UPI). The simulation results indicate that the model shows a good dynamic performance of UPFC.

Abstract: Finite-time chaos synchronization of Lorenz chaotic system applying the passive control method is investigated in this paper. Based on the finite-time stability theory and the passive control technique, the passive controller are proposed to realize finite-time chaos synchronization of Lorenz chaotic system. The controller is simple and robust to noise. Both theoretical and numerical simulations show the effectiveness of the proposed method.

Abstract: In order to improve the efficiency of offshore oil drilling, simplify the structure of drilling rigs, a new type of heave compensaton drawworks is put forward to realize decoupling control of motion and energy saving by hydraulic energy storage. In order to study the compensation performance of drawworks, mathematical simulation model is built, heave compensation displacement controller of fuzzy-PI and bit pressure controller of BP neural network are designed based on the high inertia load and nonlinear time-varying characteristics of the system. The simulation results show that the heave compensation maintains the absolute displacement of the hook within certain premises and reduces the effects on bit pressure by platform heave movement, automatic bit feeding keeps bit pressure steady, the bit pressure is kept in the scope prescribed by work. The research result shows that the device well meets the performance requirements of offshore drilling.

Abstract: A study based on FPGA controller, is used to solve the problems of control mechanism of this kind of dynamic process of coal chemical distillation process complex, process variables, controlled variables, it is difficult to establish mathematics model.

Abstract: Aiming at the problems of the poor extensibility, complicated routing and inconvenient for real-time monitoring of the traditional data acquisition of the Overhead Crane, the wireless data acquisition system was designed based on the industrial wireless transmission equipment. This system takes the use of ND250 digital radio, the Schenck weighting sensor and the industrial control computer. Combining with the weighting data management software in the upper system, the wireless data acquisition system of the Overhead Crane has been realized in this paper. Compared with the traditional data acquisition system, this system own the superiority of low power consumption, large network capacity and flexible organized-manners .

Abstract: In rural waterworks automatic control application and development situation are discussed in this paper, aiming at the characteristics of rural waterworks, the design principles of automatic control system are put forward, and the rural waterworks automatic control system model and unit control technology solutions are analyzed, in order to provide scientific and effective means for rural water construction, and promote modernization operation and management level of rural water supply project.

Abstract: According to many temperature measuring points, the large delay, nonlinear and time-varying characteristics of the temperature control system of test bench for thermal insulating property, By combining fuzzy-PID control technology with Zigbee WSN technology, a design scheme of the automatic control system of test bench for thermal insulating properties of building doors and windows is put forward, which is low-cost and high precision. The microprocessor of sensor node adopts CC2530 wireless MCU. The system adopts Zigbee wireless network and RS-485 bus to transmit digital temperature and humidity signals, and is no wiring, intermediate links are lessened, transmission error is reduced and temperature measuring accuracy is improved. By adopting Fuzzy-PID control, the self-adaptability of controller and the precision of temperature control is improved.

Abstract: This document analyze the important impact of soil temperature and humidity on the tea trees growth, and design a kind of remote monitoring system of soil temperature and humidity of tea garden based on GPRS. In this system AT89C2051 is used as controller, and it control SHT11 timing collect soil temperature and humidity information, and using AT commands control the GPRS module to access internet, establish TCP connection between the detection terminal and the data center, then remote transmit collection data to monitoring center, store and manage data by database. The application results proved that the solution is feasibility.