Advanced Materials Research Vols. 756-759

Abstract: This article is to do a research for flight simulation modified meter, to design a basic control circuit of stepping-motor modified meter, to control the signal supplied by PIC MCU, and get to the result of clockwise and anti-clockwise rotation, speed regulation, reversion to zero position of index and other controls. The control request can be achieved as a real modified meter after the improvement under the foundation of the basic control circuit.

Abstract: The monitoring system developed by traditional configuration software is extensively used in the industrial field, and application of keyboard & mouse and single-touch is the main operation mode. The multi-touch is a fresh human-computer interaction mode, which can provide the user with safer and more convenient operation experience. This design takes configuration software ControlEase (INSPEC) based on .Net framework in WINDOWS7 as development platform, and next-generation Microsoft graphics system development software WPF (Windows Presentation Foundation) is selected as development tools. WPF multi-touch control is realized based on .NET 4.0, which can be appropriately embedded in various kinds of the configuration software that run on different platforms. WPF multi-touch software frame is accomplished, which can combine with varieties of configuration software to make common configuration software in industrial application creatively own multi-touch functions.

Abstract: This paper is concerned with the problem of multiple chemical sources localization using multi-robot system. A multi-robot cooperation strategy with virtual physics force, which includes structure formation force, goal force, repulsion force and rotary force, is proposed. First, in order to test the effectiveness of the proposed strategy, two sources plume model are constructed by computation fluid dynamics simulations. Second, parallel search by two groups robots is used to locate two sources in simulation environment. With the purpose of preventing two groups from locating the same source, we proposed a rotary force which made each subgroup can locate different chemical source. Simulation experiment discussed the influence of the varied wind direction/ speed frequency and methane release frequency and different initial positions of two groups to the search performance. Finally, the comparative result about them is illustrated.

Abstract: In this paper, we compare the common plume-tracing algorithms: chemotaxis and anemotaxis in obstructed multi-source environment using multi-robot system. A multi-robot cooperation strategy with virtual physics force, which includes structure formation force, goal force, obstacle avoidance force, repulsion force and rotary force, is proposed. First, plume model with two sources in three obstacles environment is constructed by computation fluid dynamics simulations. Second, parallel searches by two groups robots with chemotaxis and anemotaxis are used to locate two sources in obstructed environment. Simulation comparison experiment with two plume-tracing algorithms discussed the influence of the varied wind direction/ speed frequency and methane release frequency and different initial positions of two groups to the search performance. Finally, the comparative result is illustrated.

Abstract: In order to improve the efficiency of welding, the automotive body pre-assembly was implemented in an automatic welding line. The author designed a robot welding gripper for the pre-assembly station, and simulated the motion of cylinder on each unit by using the CATIA DMU module to inspect the interferences and optimize the structure. The practical application indicated this robot gripper could make good use of the high-accuracy and the flexibility of robots to handle workpiece accurately and assemble quickly.

Abstract: 3G welding gun is a new kind of welding guns which uses servo motor as the driving device. And it is of modularity, simplicity, robustness and high performance and has obvious advantages compared with traditional welding guns. This paper exploited robot payload check program to make comparison of the differences between OBARA welding guns and 3G welding guns. The results verified the advantages of 3G welding guns. A case study to the application of 3G welding guns to the body side was conducted, and Delmia, a 3D platform for robotic simulation and OLP, was used to create the robot welding programs. Finally, the timing chart of welding process by means of 3G welding guns was analyzed.

Abstract: In this paper, the usual feedrate control methods are introduced. The characters of them are analyzed. The shortcomings such as the discontinuity of acceleration and jerk in these methods will influence the accuracy of CNC. In order to overcome the weaknesses, a novel feedrate scheme based on fractional power polynomial is proposed. The constraint condition is discussed. The jerk-time curves, acceleration-time curves feedrate-time curves are contrasted. The simulation result shows that this feedrate scheme can fulfill the requirements of high-speed and high-accuracy through the interpolation process.

Abstract: The methods for subsynchronous oscillation mitigation based on SVC and STATCOM are analyzed in this paper. According to the IEEE first benchmark model, the electrical damping coefficients respectively provided by SVC and STATCOM connected at the generator terminal, as well as positive damping condition, are deduced by complex torque coefficient approach. Correlative factors which influence the two positive dampings are compared. The analysis results indicate that the positive damping provided by SVC is proportional to the size of system voltage. The positive damping provided by STATCOM is not affected by the size of system voltage, which is mostly proportional to the subsynchronous voltage produced itself. The controllers of SVC and STATCOM are designed and the positive dampings separately offered by SVC and STATCOM are optimized by phase compensation with test signal method. The time domain simulation reveals that STATCOM has stronger damping ability than SVC in the case of short circuit fault.

Abstract: Converter control model plays an essential function for HVDC system dynamic simulation in real time simulator (RTDS). RTDS can provide approach for detailed studies of options and predictions of the system performance. This paper first presents the basic principle of the power control, firing control and transformer tap control. Then the paper presents our modeling effort for these control models. The configuration of control models includes major sections of practical controls. The paper also makes final verification test of these sections with a typical power system model. The validity of proposal methods and designed simulation model is verified by tests and computed results. The built HVDC control model is competent for the RTDS simulation.

Abstract: This Paper focuses on the semi-active control application in the Mega-Sub Controlled Structure System (MSCSS) subjected to seismic excitation. The semi-active control devices, which are installed in the MSCSS between the mega-structure and sub-structure, were designed by using fuzzy neural network, and those semi-active control rules were optimized to enhance the control efficiency by using the genetic algorithm. A semi-active control problem of the MSCSS subjected to seismic excitation was investigated, the time history analyses under different seismic excitation, which like El Centro seismic wave and Taft seismic wave, were performed by using MATLAB. The calculation results demonstrate that the semi-active control combining the fuzzy neural network and genetic algorithm can clearly enhances the seismic performance of the MSCSS and it also provides an improved reduction in the dynamic response when compared to the passive control scheme.