Applied Mechanics and Materials Vols. 58-60

Abstract: In recent years, remarkable progress has been made in the field of MIG welding technology. In this paper, three kinds of innovative MIG welding technology were introduced － pulsed MIG welding, double wire MIG welding and MIG hybrid welding. Recent development and achievements were summarized, including features of the various processes and applications. In the end, the future tendency was discussed.

Abstract: For the characteristics and needs of temperature and humidity control in current industrial environment, the paper proposes a fuzzy-based embedded temperature and humidity control system，which enables consumers monitor and control temperature and humidity parameters through the PDA when moving. The article first introduces the hardware structure of the temperature and humidity fuzzy control system, then based on the theory of fuzzy set and the fuzzy number operations of l - cut set, focusing on the transition rules of fuzzy controlling fuzzy conditions of the temperature and humidity control systems, and finally introduce the key technologies of embedded software system of the PDA,. The experimental results show that the system is very practical and flexible.

Abstract: To solve the difficulties in increasing large number of knowledge, with unstable irresponsible quality and acquiring automatically and implicitly dynamic individual knowledge needs of designers, an approach of knowledge service implementation in complex product design (CPD) process is put forward. The knowledge affair-matter-element model is proposed, achieving the organic integration between knowledge and design activities. Finally, the method of extensible knowledge optimization and the method of self-adaptive knowledge service are discussed.

Abstract: Huangshi is a resource based city; it needs to re-examine the traditional mineral recourses development and utilization system in terms of sustainable development concept. On dealing with the transformation of resource-exhausted cities, we can apply the city identity system into urban landscape design through the guidance of mining and metallurgy culture, so as to highlight the city resources and geographical features to promote sustainable economic development in Huangshi city, and change situation of "one side thousands cities " in the urban landscape.

Abstract: Since the financial crisis happened in the first half of 2007, the influence had been widely spread. In China, export has declined rapidly, and many companies are turning to domestic market, and when they are doing so, many of them are asking for help from internet. As well, consumers have turned to shop online. And now, with the gradual reduction of the influence of the financial crisis, the online purchase intention for consumers is changing subtly. Faced with this new situation, this article aims to investigate the online purchase intention during the post-crisis era, so as to help the internet companies to grasp the trend, and also to provide companies with appropriate advice on their corresponding marketing strategies.

Abstract: According to the failure of wind turbines in operation, the failure cause and phenomenon of wind turbines is analyzed, combined with the reliability of wind turbine subsystems, measures aiming at cooperation parts and purchased parts are proposed, the reliability of the whole wind turbines is improved in a certain extent. At the same time, condition monitoring system can carry through the early detecting and diagnosing to potential component failure maintain. Besides, automatic lubrication system can realize accurate and timeliness lubrication, also can reduce maintenance workload, preserve correct lubrication and smooth running of all parts.

Abstract: This article describes an information management system for the design of equipment and carried out in the power state companies. From software design to software development, and ultimately the results of completion,this system is of integration of today's most advanced technology RFID, with a three-dimensional structure, the use of personnel to operate on it. The system has the quick search features such as faults and statistics, this can shorten the time for fault location, greatly improved work efficiency.

Abstract: To improve the utilization of the inverter of the photovoltaic grid connected systems and decrease the harmonic of the grid, a novel selective harmonic detection method based on the synchronous rotator frame is proposed. Utilizing three-phase Park transform, the rotator vector is transferred to the static vector, and the synchronous harmonic is separated and acquired. The characteristic of negative and positive sequence harmonic is fleetly and exactly presented in all frequency domains. Additional, a new control strategy based on this harmonic detection is proposed for the integration photovoltaic grid connected generation and active power filter. Validity and practicality of the proposed selective harmonic detection method and control strategy are proved.

Abstract: In this paper the usability of using polarized filters for reading lamp to reduce disturbing reflected glare was tested based on a within-subject design ergonomic research. Results show that with the increasing polarization degree the subjective rating score decreases, which means that increasing polarization of the optical film reduces the reflected glare. Statistical analysis shows that there is high correlation (0.05 level, 2-tailed) between the subjective rating score on reflected glare and the degree of polarization. An univariate analysis of variance proves that the different evaluation caused by the optical films with different polarization degrees has statistically significant meaning (F=108.4, p<0.001). The results of this research is very useful for optical design of reading lamp, which occupies a big market in China, affecting the visual comfort of huge numbers of readers, such as students and office people.

Abstract: This paper discusses the current situation and problems of large bearing size measurement technology, and analyses the principle and the features of mechanical measurement, optical electronic measurement and modern optical measurement. Focus on the principle and the key technology of the light pen measurement as well as its application into the size measurement of the large bearings.