Applied Mechanics and Materials Vols. 155-156

Abstract: A large amount of image and video streaming need to be transmitted in wireless multimedia sensor networks (WMSNs), and a single path can not meet the requirement of image and video streaming transmission. Multipath routing protocol can increase transmission capability and be appropriate for WMSNs. TPGF is the first multipath routing protocol which is suitable for WMSNs. After TPGF is analyzed deeply, we propose an Energy Balancing Multipath Routing protocol (EBMR) which considers nodes' residual energy and the distance between the node and the sink. Compared to TPGF, EBMPR can more evenly consume nodes' energy and prolong the network lifetime. Simulation results show the advantage of EBMR.

Abstract: The extraction of information in the layout space is a basis and key to realize automatic pipe-routing layout for complex products such as aero-engines. This paper proposes the filling-surrounding spatial information extraction method. The layout space was first divided into several regions according to the location of accessories, which resulted in the parallel extraction of information in the layout space. Then by means of the filling idea, accessories in each region were filled one by one. After accessories’ rough containing boxes were determined, each accessory and free space was represented with discrete points by using grids to divide the rough containing box. Finally, the outside-in surrounding scanning was used for the rough containing box to identify the state of spatial points. In addition, the flow of information extraction and the storage mode of the extracted information were given. The case study illustrates its feasibility and effectiveness.

Abstract: In this paper we investigate the structure of the machine for high-precision radial tire production and design a new center machine with low-ring hub that can be adjusted. This new machine consists of Top Center Machine Assembly, Frame Assembly and Bottom Center Machine Assembly. The new design resolve the problem of compatibility of multi-specifications, make the procee of replacing bladder become convenient and improve the productivity of the machine.

Abstract: The research introduce the present situation of nationwide fitness in china and construct a “material database for nationwide fitness” which contains three subsystems (health consult, fitness guidance and online information comunication). We can make guidance selection for fitness mode according to different demands of fitness groups and give suggestions to different fitness groups. Which make them select convenient modes and achieve satisfied effect. The material database for nationwide fitness have features of convenient, easy to universal, effetive, pratical and resource share. By construction of the material databasesystem of nationwide fitness, material databaseas a medium and play sports resource sharing effetive to make good foundation for nationwide fitness development.

Abstract: MAP is a effective measure of food conservation. How to determine the proportion of different gases filled is a problem, and BP Network is fit for nonlinear problem solving of this kind.In this paper, the defect of common MAP is discussed, the basic principle of BP Network is introduced. To resolve the problem of MAP evaluating, the parameters of MAP is analyzed, the process of evaluating is introduced. Based on BP Network, the model of MAP evaluating is set up and is proved by example. From the result, it is easily be concluded that this method is effectively and is adapt to all MAP evaluating and capable of afford basis for MAP.

Abstract: Super precise is one of the primary requirement of the high-speed motorized spindle. Temperature distribution, speed control loading characteristics, precision maintenance, liberation intensity and circumgyration error are not only the key demand of motorized spindle's capability but also an important index to evaluate it's performance. The paper has detailed described the main structure of motorized spindle. A 3D motorized spindle model was established and carried out thermal analysis to study the heat generation and heat transfer. Under the ANSYS finite element software circumstance, the temperature field distribution and the temperature rise condition for motorized spindle are researched. From the result, we can find the front bearing has a higher temperature than that of back bearing. The maximum temperature of inner ring is bigger than that of outer ring. The results contribute to selection of appropriate bearing for motorized spindle system.

Abstract: According to the traction calculation and energy saving control strategy, the energy-saving method of the urban rail vehicle’s running is optimized. The running characteristic curve and energy consumption are calculated based on the actual running conditions of the Shanghai metro line 2 by using the optimizing algorithm and the calculated results are analyzed comparatively with the actual test data of Shanghai metro line 2. The research results show that the energy¬-saving efficiency of Hybrid optimization algorithm which the rail braking for two times is higher than the braking for one time. These works will provide the important reference value for the research on the energy-saving of the urban railway vehicle.

Abstract: The most uncertain input parameters that often considered for calibration in water distribution system hydraulic model are pipe roughness coefficients and nodal demands. Both pipe roughness coefficients and nodal demands are considered to be calibrated in the calibration process, which works alternately. The calibration model was formulated as a constrained optimization problem. The entire head losses under different loading conditions are introduced in the objective function to guide the calibration direction, which can make consistent calibration effects on different loading conditions. The calibration model uses real-coded genetic algorithm along with a general network solver (EPANET 2.0) to adjust pipe roughness coefficients and nodal demands multipliers until the preset criteria are meet. The approach was applied in the calibration of a real-life water distribution system hydraulic model in China, which takes three loading conditions (max, min and average hour) into consider. The results show that the approach works well in achieving good calibration results, which match field observation in a reasonable level and meet engineering requirements.

Abstract: With a motivation to understand microscopic aspects of TiN relevant to the electronic structure, phonon and thermal properties of transition metal nitride TiN superlattices, we determine its electronic structure, phonon spectra and thermal properties using first-principles calculations based on density functional theory with a generalized gradient approximation of the exchange correlation energy. We find that the electronic bands crossed by EF are half occupied, TiN has the ability of taking part in chemical reactions and also has the surface activity; A large gap in its phonon spectra, anomalies in the phonon dispersion of metallic TiN, manifested as dips in acoustic branches, but it do not contain soft modes in any direction; The specific heat (Cv) of TiN rises rapidly at low temperatures, the Cv values of the material, is identical to the Dulong-Petit value at high temperatures. Under the quasi-harmonic approximation (QHA), the thermal expansion, specific heat and bulk modulus B(T) are obtained, and the B(T) decreases along with the increase of temperature.

Abstract: After introducing the design method of digital current (DC) power supply and the circuit schematic diagram and software flow chart of the key part, the paper designs the core processor based on ARM 32-bit Cortex™-M3 as controller, which, in hardware, has the features of high accuracy and simple circuit, and in function, parameters can be set both through keystroke and computer serial port. Meanwhile, the voltage and current of power supply are of high accuracy, quick in adjust response and with small output voltage ripple.