Applied Mechanics and Materials Vol. 577

Abstract: This paper concerns trajectory tracking control of AGV. The model of forked AGV was simplified from a three-wheeled vehicle model to a “bicycle” model. The dynamic model of vehicle lateral motion was built depending on Newtown’s second law and the analysis of lateral tire forces. The optimal control linear quadratic regulator was applied to achieve trajectory tracking control. Use the MATLAB and CarSim to simulate. The satisfied results proved that the control algorithm was effective and could make the system stable.

Abstract: In view of the unstable phenomenon of the visual system of the AGV in the automatic system, the paper adopts the MEMS gyroscope MPU6050 to collect the status of the visual holder. We can guarantee the stability of the holder, obtain clear pictures and improve the operating validity of the vision-based guided AGV by controlling the brushless motor through the Arduino single chip microcomputer program.

Abstract: To integrate chemical reagent retrieve/storage (R/S) device with management information system, an intelligent mechatronic system is developed. Three kinds of unit cabinets for reagent bottles are constructed. A Single-chip Microcomputer and a Personal Computer are served as a slave and host control system respectively. A set of special application software is programmed by VC++ and Access to accomplish reagent retrieve/storage, usage reports and surplus warning by short massage based on the Internet of Things. The integration of chemical reagent R/S device with MIS is realized which could make the storage device automation, data visualization and measurement precision.

Abstract: In this paper, a systematic control strategy has been proposed for specific problems with the various key performance indicators of the high-power photovoltaic (PV) inverter when it connects to the grid. it proposes fast and accurate variable-step-size perturbation and observation combined with power prediction as a Maximum Power Point Tracking-based (MPPT) control strategy. To meet the requirements for low voltage ride through (LVRT), it proposes a strategy for LVRT control. It adopts an active method used for anti-islanding detection of reactive power disturbance so as to realize anti-islanding detection quickly. Finally, it carries out testing on the control strategy by means of an experimental platform with a 500 kW PV inverter to prove the effectiveness of the proposed control strategy.

Abstract: In order to decrease the signal integrity problems caused by Simultaneous Switching Noise (SSN) in the high speed circuit, it has designed an improved planar electromagnetic band-gap (EBG) structure, which based on metamaterials. We want to model and simulate the stop-band characteristics by using the electromagnetic simulation software HFSS. The results show that, compared with the traditional UC-EBG structure, when the inhibition of depth is-30 dB, the bandwidth of this new type EBG of inhibition is 3.7 GHz, the upper cut-off frequency is 4.7 GHz, the lower cut-off frequency is 1 GHz, relative bandwidth is 130%.Compared with the traditional UC-EBG structure relative bandwidth increase 15%.

Abstract: This paper presents steady-state characteristics analysis of a self-excited single-phase induction generator (SPIG) which supplies an isolated load. The self-regulated characteristics of a SPIG by connecting external capacitors are examined. The system consisting of both shunt and series capacitors in short shunt and long shunt connections to improve voltage regulation of SPIG has been analyzed. Based on two-phase symmetrical components equivalent circuit model, a fast iterative approach to simulate the operated state of a SPIG is developed. To demonstrate the effectiveness of the proposed approach, the approach has been tested on a practical motor-driven SPIG. Very close agreement between experimental and simulated results has been obtained.

Abstract: A new current mode circuit which can maintain the maximum output and minimum output at the same time is presented in this paper. The design technique is achieved by the combination of trans linear loop, winner take all (WTA) circuit and loser take all (LTA) circuit. Therefore, the proposed circuit can be more practical than conventional circuits and can be easily designed in 0.5 μm CMOS technology for CSMC. Analysis and simulations of WTA and LTA circuit have been shown to display the usability of the proposed circuit, where the input frequency range is around 10 MHz. The proposed circuit can also play a neuron role in artificial neural network (ANN) implemented in the form of an integrated circuit.

Abstract: Due to global environmental deterioration, photovoltaic (PV) system (i.e., solar panels) is becoming more common as a renewable energy source. So the rational use of renewable energy put forward higher requirements. This article will explain how to combine Buck converter and MPPT technology to optimize the process of solar panels while charging the battery. The article will analyze the working states of Buck converter. The combination of the application of MPPT technology and Buck converter will be clarified.

Abstract: Based on the single-phase H-H power unit topology in the novel co-phase power supply system, with the back-to-back grid-connected operation method, this paper aimed at solving the problem that in experiment, system capacity constraints caused the failure to achieve unit full power output and proposed the strategy of rectifier voltage, current double closed loop and full disturbance feed-forward control. Finally, based on the digital signal processor (DSP) and complex programmable logic device (CPLD), this study constructed a hardware platform of the power unit control system. Experimental results show that the system is stable, achieving two-way flow of energy.

Abstract: With the reduction of non-renewable energy resources, energy conservation and development of new energy has become an important strategic plan around the world. Photovoltaic technology is also developing rapidly with more and more applications of solar energy. The project designed a set of solar photovoltaic grid-connected power generation analog devices. In this paper, the maximum power point tracking, DC-AC inverter technology, SPWM control technology related to single-phase grid-connected PV system have been studied, a comprehensive theoretical has been analyzed and to develop the relevant control scheme and design a set of simulator based on MSP430F169 microcontroller. The experimental results have met the target and achieved the desired effect.