Applied Mechanics and Materials Vol. 620

Abstract: In order to improve the level of automation of elevator flexible sheet metal processing production line, flexible sheet metal processing production line based on an open architecture CNC system is proposed. The basic idea of the project is combining CNC bending machine, roller conveyors, robotic welding and other general processing equipment through reasonable project, supplemented by the necessary gauge, mobile unit, feeding positioning equipment, according to the special requirements of sheet metal processing, so that automation of elevator sheet metal production can be achieved, quality of sheet metal processing improved and production costs reduced. In all, the development of the production line can reduce our dependence on labor in the Production and processing of sheet metal.

Abstract: This study attempts to make cognitive evaluation about pre-optimizing and post-optimizing digital monitoring HCI in nuclear power plant through 18 quintessential eye movement data of 20 test subject using eye-tracking technology. The result suggests that the optimized monitoring system excels cognitive evaluation in fixation time, saccade distance, pupil size and other quota, thus proving its validity.

Abstract: Compared with the conventional piston engines, the new rotary engine has many significant advantages, such as smaller volume and higher power density. Current studies at home and abroad are mainly focusing on aspects of its structural design, kinematics, dynamics analysis, except mechanical efficiency. In conventional piston engines, frictional loss of the piston group accounted for 65% of the total friction power loss ^[1]. In order to provide the scientific basis for designing low friction piston of the rotary engine, this paper combine the average two-dimensional Reynolds equation, the asperity contacts equation, viscosity-temperature equation and loads balance equation, proposing a method for calculating the friction power loss, and the applying the method to calculate the friction power loss of piston group of a new rotary engine.

Abstract: The Haokou power station is located in the south of Wu Long in chongqing, which is a medium-sized hydropower project given priority to electricity. The Dam located in south bank of Wujiang river downstream of Furong river has the catchment area of 7400 km², total capacity of 94.12 million m³, installed capacity of 125 MW power . After the excavation of the main building, trailing edge to form 30 m high rock slope is tangential. Slope rock mass is given priority to with weakly weathered shale, mudstone, shallow accumulation horizon, thickness is about 0.5 m to 6.0 m. In analysis of slope stability, the FLAC 3d and the strength subtraction method was used. Considering of gravity, the shore web of pressure, water pressure and reinforcement bolt load combination, the stress response, displacement response, plastic zone as well as the safety factor of slope was analyzed. The calculation results show that the slope is stable.

Abstract: This paper investigates methods to improve the flow coefficient of diesel nozzles so that the combustion efficiency can be improved and the emissions from diesels can be reduced. And abrasive suspend flow was introduced as the last process step of improving the flow coefficient and controlling the flow at a small range. To find appropriate parameters to make the measured flow after processing as far as close to the set flow, an orthogonal experiment was designed and implemented. According the analysis to the orthogonal experimental result, several line charts about the fluctuation caused by parameter were shown and a group of appropriate parameters was determinate.

Abstract: This paper presents 66kv capacitor canceled fuse after the differential current protection setting calculation method, analyzes the application effect in practical engineering.The detailed calculation method has been analyzed in this paper, and the idea can be helpful in some cases

Abstract: While the system is equipped with Petersen coil caused by the switching operation can prevent a different period , single-phase disconnection and other factors neutral point displacement , so that the neutral point voltage is too high, the threat of insulation safety equipment . Also in the normal operation of the power grid , but also effectively prevent resonance over-voltage , prevent system damage caused thereby , better protection of system security , stability, and high-quality operation. Summary of small current grounding system after the formation of arc suppression coil compensation compensation network system , in order to better prevent arc short-circuiting the system of single phase , which is to ensure security of supply , improve reliability and power quality .In the paper, small current grounding system Petersen coil with the compensation adjustment is carried out and some analysis, study and research is done in order to improve the operating personnel awareness and emphasis on small current grounding system , and better ensure the safety of the small current grounding system , stable operation.

Abstract: Equipped Petersen coil systems can compensate for the capacitance of the line current, the single-phase ground fault current flows through the capacitor grounding point for the minimum point of the arc of a reliable ground fault arc , to avoid reigniting , prevent arcing ground fault point phase faults caused by short circuit . But will also prevent the neutral point displacement due to different switching operation of single-phase disconnection caused by other factors , to avoid the neutral point voltage is too high, the threat of insulation safety equipment . In addition Petersen coil in the normal operation of the power grid , and can effectively prevent resonance over-voltage , prevent equipment damage caused thereby , better protection of system security , stability, and high-quality operation. Automatic tuning arc suppression coil can meet the common good basis to eliminate the role of the Petersen coil grid resonance occurs , install and use the effect is significant.

Abstract: This dissertation proposes a method of constructing a delay matrix using the output signal sequence of single voltage transformer instead of the multiple sensor output signal arrays. The matrix satisfies the basic requirement of BSS so that each frequency component is separated from flicker,harmonics and inter-harmonics which contain a number of frequencies.

Abstract: CuO nanostructures materials were prepared by thermal process using carbon charcoal assisted. The copper powder and copper sheet were mixed and covered with carbon charcoal. The starting materials and Si substrates were put in the furnace and heated at various temperatures under atmosphere of nitrogen gas. The prepared products were characterized by scanning electron microscope and X-ray diffraction technique and then studying for changing of the electrical resistance with temperature. The results revealed that the nanostructures of material consisting of CuO and Cu₂O phase and the electrical resistance was changed with temperature.