Applied Mechanics and Materials Vol. 443

Abstract: This thesis researches mathematical models and optimization problems of solar photovoltaic cells. According to the defined priority, the arrays of photovoltaic cells on every wall are given. The thesis then identifies the optimal inclination and the optimal direction angle with the help of spherical coordinate system, thereby further optimizing the model. Meanwhile, according to the given data of the problem B of China Undergraduates Mathematical Contest of Higher Education Cup in 2012, the thesis demonstrates example analysis of optimization model of solar photovoltaic architecture.

Abstract: C30 concrete has been universally used. To improve its quality, the author of this paper made an experiment so as to obtain the optimal proportions of flag, fly ash and silica fume in green concrete. She used granulated blast furnace slag, fly ash and silica fume as concrete admixtures by means of equivalent replacement of cement, mixed them with water reducing agent. She compared the maximum compressive strengths of concretes with different ages and minerals in four schemes and obtained their respective optimal proportions: (1) when slag dosage is 35%, fly ash is 10%, the maximum compressive strength values of concrete with different ages are 27.4 Mpa, 38.6 Mpa, 40.6 Mpa and 45.1 Mpa; (2) when slag dosage is 35% and fly ash additive is 10% and water reducing agent 1%, the maximum compressive strength values with different ages are accordingly 42.3 Mpa, 43.8 Mpa, 46.3 Mpa and 47.0 Mpa; (3) when 30% of fly ash alone is added and 1% of water reducing agent is added, the maximum compressive strength values with different ages are 35.3 Mpa, 39.0 Mpa, 39.8 Mpa and 43.1 Mpa; (4) when fly ash is 30%, slag 20%, silica fume 10% and 1% of water reducing agent is added, the maximum compressive strength values with different ages are 37.2 Mpa, 38.7 Mpa, 40.0 Mpa, and 44.4 Mpa. In addition, the role of performance and mechanism of the above admixtures and uses of green concrete are also expounded..

Abstract: smart power technology is an important part of the smart grid, based on the analysis of the concept of smart grid and smart power technology and research status,the paper propose a new type of two-way interactive customer intelligent power marketing system. With reality, from the surface of the information collection system, intelligent demand-side management, customer knowledge management, load control, customer credit risk management, customer relationship management, customer resource valuation analysis of the basic functions of each sub-system and path, in-depth analysis of smart power technology and power marketing work.

Abstract: Gas is a flammable, explosive and high-pressure medium. Gas pipelines are passing through many different geographical conditions of changing natural environment with gas. Therefore, a lot of adverse consequences will be bought by the gas pipeline failure, however not all consequences have a great impact on assessment of the losses. The rough set theory is used to simplify the accident loss. In this paper, the accident loss of gas pipelines of the gas enterprise in one city taken as an example is evaluated and forecasted with the rough set theory, which can bring the scientific foundation for the managers management and decision.

Abstract: In the face of the energy crisis and environmental pressures , the development and construction of low-carbon building has become a forceful measures to promote the development of building industry science, which is also an important factor to improve the people's living and living standards .From the perspective of the entire cycle of life, we use the analytic hierarchy process to explore the constructional project in the decision-making , planning and design , construction , and the effect of the usage and demolition disposal phase of the carbon emissions , we build the model of cycle of the low carbon building initially; it makes clear that we will face difficulties and challenges to develop the low carbon in the field of building codes, providing a theoretical basis for the development of the healthy and effective low-carbon building.

Abstract: To construct low-carbon city, the development trend of green living is gradually clear, low-carbon has become the new trend of various fields development, and green planning, green building and low-carbon consumption also have become the mainstream of society. From the green low-carbon and minimalistic design of the packaging field starting, first expounded the importance of packaging materials green low-carbon and its superiority analysis, and then the use of random choice model makes science choice analysis of packaging materials, further using the deterministic model analyzes the layout and color of packaging design, to provide the theoretical basis and practical new model for green low-carbon packaging and minimalistic design.

Abstract: Large scale electric vehicles integration into power grid, as nonlinear loads, will pose inevitable impacts on the operation of power system, one of which the harmonic problem will affect the power quality greatly. Firstly, the article analyzes the characteristics of harmonic caused by electric vehicle charging. And then, the harmonic flow distribution is analyzed based on the IEEE standard node systems. During transient analyses, the electric vehicle charging stations connected to electric grid are represented as harmonic sources. Results show that structure and voltage grade of electric grid, capacity and access points of electric vehicle charging load will have different effects on harmonic problem. At last, a few conclusions are given for connecting electric vehicles to electric grid.

Abstract: Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point.Vibration platform uses machine, control system and information technologies to optimize human performance. In order to explore the mechanical effect of vibration based on machines and control systems on human performance, twenty participants were voluntarily involved in this trial. The findings of this study indicated that automation vibration has significant difference on human performance. It has a positive effect on human body. Therefore, vibration can be used in auto regulation.

Abstract: For stepper motor motion control problem of tailoring machine,the paper designed control system based on the LPC2138 and SLA7062 stepper motor subdivision , and realize of high-precision stepping motor subdivision control. Experimental results show that the stepper motor can be subdivided under the control of the control system stable and accurate operation, tailoring machines can meet the accuracy requirements.

Abstract: In the study of high speed cutting technology of complex parts, cutting methods and techniques must be closely combined with the selection of geometric parameters of cutting tool materials and cutting tool integrated. Numerical control machine tools and cutting tools without good guidance technology, cannot give full play to the advantages of NC machining. Based on this, this article mainly aimed at the complex parts NC cutting parameter selection, therefore cutting parameter optimization mathematical model is set up, and optimize it.