Advanced Materials Research Vols. 433-440

Abstract: In order to obtain the controlled object’s better tracking performance within the reference signals’ boundary region, an adaptive fuzzy sliding-mode controller is designed aiming at the uncertain second-order nonlinear system. After taking account of the control sensitivity’s requirement for the membership function, the controller capitalizes on the generalized membership function’s adaptability of the generalized T-S fuzzy model without the supervisory control and boundary control that may compensate the system’s modeling error. So, the generalized T-S fuzzy logic system can better approximate to the controlled object and effectively decrease the tracking error within the reference signals’ boundary region. Using Lyapunove’s stability theory, it is proved that the control system is stable. Simulation results show that the design of the controller is reasonable and available.

Abstract: For the problems of parameters disturbance, nonlinear and uncertainty of distribution static compensator (DSTATCOM), this paper studies on sliding mode control based on radial basis function (RBF) network. The fast tracking of DSTATCOM reactive current is achieved by using of RBF neural networks and equivalent sliding mode control. The method has a strong adaptability and robustness for load disturbances and system parameters change, and integrates the advantages of neural network and sliding mode control, so it is an ideal intelligent control strategy .The MATLAB simulation results show that the controller has good dynamic and static quality, and provides an effective way for improving the performance of DSTATCOM.

Abstract: To realize the efficient and stable real-time monitoring and intelligent management of the urban public lighting, the remote monitoring system is developed. The system is composed of monitoring center and monitoring terminals, and realizes network connection via the advanced remote wireless communication technology GPRS. It uses TI Company’s MSP430 processor chip as the monitoring terminal controller, which integrates automatic control, data acquisition, communication and other technologies and has such functions as monitoring, remote control, anti-electricity theft, remote meter reading and communication. It’s proved by practice that the designed controller features reliable running, sound real-time performance and low cost, and has a broad and bright application prospect. The monitoring and management of public lighting is a typical sector and important part of the civil work. Due to the continuous development of urban construction and ever-enlarging lighting coverage, the traditional lighting management methods can not realize centralized monitoring, have poor real-time performance and cost lots of human and material resources; thus, can not satisfy the requirements of energy saving and efficiency improvement[1]. GPRS (General Packet Radio Service), the wireless packet exchange technology based on the second generation mobile communication system GSM, is very suitable for transmitting non-continuous, unexpected and small sets of street lamp monitoring data. Also, quick & easy log-on, real-time online, high-speed transmission, sound economical efficiency and many other advantages make GPRS become the first choice for remote measurement and control system[2]. Therefore, the development of GPRS-based public lighting remote monitoring system becomes a necessity. The designed monitoring system in this article is a typical distributed monitoring and data acquisition system integrating computer technologies, modern communication technologies and automatic control technologies. It conducts centralized monitoring and control on the cabinet transformer substations, transformer cabinets, control cabinets and other slave monitoring systems of the public lighting such as street lamps and landscape lamps of the city, to realize the real-time, remote monitoring and intelligent management of public lighting and ensure the efficient, all-weather running and on-demand, energy-saving lighting.

Abstract: For gantry CNC Machining Center Gantry suspension system, adopting a method of fuzzy synchronization controller and disturbance observer combined control strategy. The disturbance observer Robust feedback controller design compensate the disturbance caused by cutting the time, un-modeled dynamics, system parameter changes, ensure the robustness of a single suspension system. In order to further suppress the gantry beams carrying knife leaning, on the double suspension synchronization system uses fuzzy synchronization control strategy, the two systems through the design of the regulating role of fuzzy controller, and further to overcome suspension height deviation of the double suspension systems, to achieve synchronized suspension purposes. Simulation results show that the proposed control scheme in ensuring the system to achieve stability synchronization suspension, but also has strong robustness, dynamic process synchronization error is small, allowing to meet high accuracy requirements of the controlled objects.

Abstract: By analysing the formation mechanism of human facial expressions and summary of existing research about facial expression robot, the paper summarized the facial expression robot, developed three technical difficulties, and proposed the improvements according to the technical difficulties. Based on the above, the paper presented one facial robot with eight facial expressions of basic emotions. In mechanical part, the mechanical structure with 20 degrees of freedom is designed; in control part, SSC32 V2 is used to control 20 servo coordination movements; in simulation modelling part, a special silicon rubber material is developed and the soft part of material is used to as the skin of facial expression robot. The facial expression of robot substantially increased the extent of such robot simulation.

Abstract: Through the establishment of dynamic model of tractor-semitrailer, calculate its transfer function. In the case of the third and fourth state of balanced coefficient is very small in the original model, the model of the tractor-semitrailer of fourth-order drop for second-order using MATLAB-modred () function and balreal () function, seek of relationship between damping ratio and the speed of tractor-semitrailer, The results show that: the tractor-semitrailer shimmy of high-speed is speed inversely proportional to the damping ratio, the higher the speed, the smaller the damping ratio, and thus more likely to shock and shimmy.

Abstract: Based on heat transfer theory and thermal-structure coupled in sequence method of finite element, the stress and displacement distribution of a certain high power density diesel engine cylinder liner under the action of thermal-structure coupled loads was calculated. The results showed that the highest temperature field of cylinder liner appeared on the upper part of the cylinder liner inner surface. Furthermore, the maximum stress value and displacement value of cylinder liner were obtained, which will give a gist for designing and calibrating cylinder liner in practical.

Abstract: Principle of triangle carrier amplitude modulation is equivalent with sinusoidal modulator amplitude modulation, and principle of sinusoidal modulator phase-shifting is equivalent with the triangle carrier phase-shifting are proposed. A digital natural sampling based on multi-channel SPWM generator is developed using time-division multiplexed access (TDMA). Flip time computation by CPU is no needed in the generator which has an accuracy flip time. Design principle and implementation based on FPGA are introduced, and testing results are presented.

Abstract: At present, the development of power industry is facing the pressure of energy saving and emission reduction. This paper reviewed briefly the strategy for development in optimizing power cycle and improving comprehensive utilization of heat energy. A economic analysis was made to the combined power cycle/refrigerating cycle air cooling system (hereinafter called ‘combined cycle air cooling system’ or ‘CCACS’) which presented previously and estimated its contribution to energy saving and emission reduction in this paper. An analog computation example shows that the combined cycle air cooling system based on the compression refrigeration is feasible and effective. Finally this paper pointed out that the air-cooling system is facing the re-selection under the new situation, the indirect air-cooling system will be of importance to the development, and the combined cycle air cooling system will become a kind of new options.

Abstract: The distribution of oil Wells is mainly in the field or by sea, most of the oil Wells are using human inspectors for condition monitoring, the problems of this are low efficiency and lack of real-time monitoring. Nevertheless, the problems can be solved by introducing Beidou satellite data reporting system, with the installation of RTU on each oil Well, the pressure, temperature, beam-pumping unit load and displacement data will be sent to the data monitoring center in the oil field. The monitoring software makes a full use of the LabVIEW’s data flow driven language features and operation control technology, along with the use of serial communication technology to achieve the long-distance data acquisition of the beam-pumping, therefore, not only that operation data of oil wells are gained promptly and having safety under control, but also greatly improve efficiency and reliability of oil wells’ condition monitoring.