Applied Mechanics and Materials Vols. 268-270

Abstract: With the development of manufacturing technology, modern CNC machine tools are greatly improved in machine processing range, dynamic performance, the processing precision and reliability with the help of the modern design technology, process intensification and the new function part. The research object is mainly based on a CNC milling machine spindle system, using ANSYS software for the spindle of machine tool modeling, and then puting the design parameters into the already built parameterized model. It is known that the spindle is in high speed operation of the deformation and vibration characteristics by analyzing, the some unreasonable parameters were improved using some assumptions, so that the spindle is more stable and reliable in high speed and super high speed running dynamic performance, thus improving the processing precision fastly. Through the model analysis, this step is simplified in manufacturing prototype, thereby simplifying the cost, shorten the design cycle.

Abstract: With the increase in wind power generation and network capacity, Wind farm power fluctuations on the grid greatly. In order to improve the operational stability of wind farm grid, at its outlet to increase the energy storage system for the new environmentally friendly vanadium redox flow battery (VRB) to effectively regulate the grid power. According to the VRB equivalent mathematical model using a bidirectional DC/AC converter as VRB storage system power regulator, the corresponding charge discharge control and energy management strategy are designed , and grid-connected wind farm system with VRB energy storage unit are modeled and simulated. Simulation results show that the fluctuations in wind speed Circumstances, the VRB energy storage system can quickly and effectively smooth the fluctuations of the active power of the wind farm output, and can provide reactive support to the grid, effectively improve the operating performance of wind farm.

Abstract: Chaos is a kind of quasi-stochastic behaviors of determinate nonlinear system. As one of the most important achievements of nonlinear science, chaos attracted common attention and had been extensively studied in the last four decades. Recently, how to apply chaos has become the researching focus. Chaos control and anti-control is the basic problem of the application of chaos. After introducing the characteristic of chaos and some typical PV systems, this article has a discussion about DC-DC converter that chaos would emerge and the methods to restrain and take advantage of chaos. At last, an example of chaos anti-control is given to verify the effect of controlling. However, there is no certain method for the universal systems and structures. And the diversity of chaotic system leads to diversity of chaos control. Therefore, looking for effective and feasible methods for special plants and control aims is a very important task.

Abstract: Nowadays energy is the important foundation of modern national economic development. Electric power as the main form energy supply is very close to the national economy, the consumption of social power energy represents the development of modern society [2]. In recent years all countries in the world are seeking to develop alternative energy in actively, exploring the sustainable development of the energy strategy. The wind power is a renewable energy which can be used in large-scale, and this power is friendly to environmental and makes for sustainable development.

Abstract: This study focuses on the recycling of massive waste materials and their thermal impact to buildings, which then adapt the indoor thermal environment. It is observed that the role of construction materials modify the building interior and consequently regulates the indoor thermal environment and focus on the reduction of energy consumption at large. The rapid growth of energy consumption has raised concerns in worldwide. This has caused mainly the exhaustion of energy resources. Efficient employs of energy play a vital role in minimizing the energy usage. Having in mind the aim to seek for contextual alternative building material from waste to obtain continuing improvement in building energy performance, then this study has been designed to do experiments on locally available massive waste material (end-of-life tires, or ELTs) and investigate its thermal impact on indoor energy management strategy. For that reason, it is needed to set up an experiment to observe the role of ELT for thermal comfort in a tropical climate as compared to conventional construction materials and other waste. This contribution mainly focuses on the literature and a proposed methodology.

Abstract: A hot model is established to study the cohesive zone of COREX melter gasifier in this paper., in this experiment, the paraffin and corn are used to simulate DRI, coke and lump coal respectively, the influences of ore/coke volume ratio, raceway gas temperature and raceway gas volume on the cohesive zone are analyzed using image processing method.

Abstract: with the development of new technologies, investment costs and operatingcosts of large-scale wind farms has dropped significantly, the market has begun to enter the operational phase. As global demand for energy and environmental pollution in the form of increasingly severe, the development of renewable energy has become a strategic arrangement of the world scientific and technological developmen. Wind power renewable energy in the near future will be the most promising-scale energy.. Foreign large-scale construction of wind power reached 8,000 yuan/kW 0. 4 yuan/kWh is exoected in the next 15years there is a 40% price cut. The large-scale wind farm is about to become a competitive option in the electricity market. The key prospects depend on the cost of the wind power market, and reducing costs is the key to scientific and technological progress and industrial scale.

Abstract: Energy consuming condition of thermal power unit is reflected by its historical operation data, but the amount of data and the number of energy consumption indices are large. And there are complex and strong correlations among them. These make it difficult to assess the energy consuming condition of unit. This paper proposes a model and method based on improved Principal Component Analysis(PCA) assessing the energy consuming condition of unit. Those assessment problems are solved well by the application of feature extraction and dimensions reducing functions of improved PCA. Meanwhile, traditional assessments’ drawbacks-subjectivity and uncertainty are avoided because the weights of components are determined completely according to the data. Finally, the feasibility and effectiveness of the proposed model are demonstrated with a case study involving energy consumption condition analysis of a 600MW unit in China.

Abstract: The aim of this paper is to investigate the heat sink properties of ELT (end-of-life tyres) waste. A hazardous waste, ELT or massive scraped tyre waste created environmental load to the local environment. Today, when researchers think of the environmental impacts of tyres, they mostly focus on the management of tyres at the end of their useful lives. From Global perspective it is found that one billion tyres reach the end of their useful lives annually, out of which about four billion ELTs are currently in landfills and as stockpiles worldwide. Study revealed that most of the developing countries currently are not experienced with the disposal method of ELT. Besides, developed countries from Europe, USA, Japan and Singapore have framed specific law or regulation to the disposal of ELT. Recently it is obvious that should find out alternative ways as to reduce the load of massive ELT waste. Furthermore, this study has been designed to manage ELTs massive waste, experimentally. Due to fact that this research followed by an effective experimental set up to observe the real phenomena of ELT for passive cooling in hot humid and tropical climate and make comparison with conventional construction materials and systems.

Abstract: The success of numerical simulation of solidification process depends to a large extent on boundary condition. Interfacial heat transfer coefficient (IHTC) can be used to measure heat resistance between casting and mold. Boundary condition of casting and mold varies with the temperatures during solidification process. However, determination of heat exchange on the boundary is very complicated. A new simple reverse method has been introduced in this paper. A casting with simple geometry acts as the standard sample and a thermal couple records the temperature history at the center of the casting during solidification. The solidification simulation of the casting was conducted with different IHTCs. The equivalent IHTC that best fits the measured temperature can be determined by comparing the measured cooling curve with the calculated one.