Advanced Materials Research Vols. 228-229

Abstract: In this paper, we use survey data from 165 enterprises in Hunan Province, in addition, we take in the Probit model to make empirical analysis about the willing for companies to build the logistics cost control system of supply chain and its influence factors from the following four aspects: the features of enterprise, the features of senior management, the external environment as well as the expected market. The results show that the willing for companies to build the logistics cost control system of supply chain is not strong. Among them, the willing is significantly correlated with the firm size, the type of senior management, the awareness of cost control system of logistics, government support policies and cost management techniques as well as its methods of development, while the willing has negative correlation with the nature of corporate, the risk expectations and the expected cost. In addition, the education of senior management and the behavioral factors of peer competitors have the same expected direction with our paper, but not significantly.

Abstract: This paper investigates an unconventional honeycomb cellular structure featuring a negative Poisson’s ratio with the ability to undergo large overall displacements with limited straining of its solid material in the spanwise direction. Numerical analyses are performed to exploit such properties in the design of a morphing airfoil. The commercial simulation software ANSYS is used to carry on these processes. The cellular structure is designed to satisfy the requirements of configuration changing occurred while wing morphing. Finally, detailed numerical models of the structures are presented as a possible approach to evaluate the stress distribution of the structure. According to simulation results, the airfoil designed in this paper has the property of negative Poisson’s ratio, which is useful to the morphing wing aircraft design.

Abstract: As the core equipment of the metallurgy, cement, chemical production enterprises, the mechanics status analysis of rotary kiln cylinder is paid close attention on engineering site because of its frequent damage and expensive maintenance cost. With two supporting the lime rotary kiln was studied in the paper, the cylinder shell, kiln lining and materials were looked as a whole system, the cylinder and kiln lining were modeled with lamination and partition, the various factors to stress of the kiln cylinder were researched, such as the cylinder axial thickness, the cylinder axial materials and materials in it, the finite element software ANSYS was used to analyze the structure stress and thermal stress distribution status of cylinder, the analysis results are helpful for the design and optimization of rotary kiln cylinder.

Abstract: Since the transitive closure of a lattice matrix can be used to analyze the maximum road of network of traffic control and logistics, the study of the transitive closure of a lattice matrix is valua- ble. A matrix is called a lattice matrix if its elements belong to a distributive lattice. In this paper, the transitivity of powers and the closure of a lattice matrix are studied. Also, an optimal algorithm for co- mputing the transitive closure of a lattice matrix is posed.

Abstract: Along with the rapid development and popularization of modern computer technology, Virtual tactile design software have been born, which is mainly characterized by its simple operation, quick production lines and the low cost of production, showing the powerful vitality. This article, based on the virtual touch-type design software--Freeform, adopting advanced technologies, "virtual sludge", "virtual design", and "force feedback" to design, takes Dongba sculpture as an example to analyzes the advantages, such as design process, innovative consciousness, mass production, and ways of reducing the product cost, which paves the road of prospects for this software and the sustainable development of modern sculpture in Dongba.

Abstract: Application of doubly-fed variable speed system in motor-generator station is a new field in marine. This paper introduced the theory of doubly-fed variable speed and the design of doubly-fed system, adopted stator flux orientation vector control in induction motor by rotor current control with inverter. A kind of simple and fast starting device was designed, thus the power demand of inverter was reduced greatly. Experiment results showed that doubly-fed induction machine was good for speed adjusting and transient speed change rate was smaller than 1%.

Abstract: The loading pressing on slide block universal spindle under the friction situation is studied, and the calculation formula of the strength is derived in this original paper. Using the calculation formula, the strength of the slide block universal spindle in the 1100-mm blooming mill in an Iron And Steel Company is calculated. Through analysis, the conclusion is obtained. The distribution law in the stressed surface of the spindle drum’s unit pressure will be changed consequence of friction and wear, and the change of the loading condition promotes the wear of the slide block and the destruction of the fork.

Abstract: Fan is a major part of the cooling system in the vehicle, axial flow fan is used very common recently. In order to improve the cooling capability, cooling fan’s structure has been changed; experiment research and numerical simulation are done for it. The result show that after adding guide vane to axial flow fan, its mass flow increases. At the same speed, the mass flow is increased by 20% when a rear guide vane is installed, and 15% of mass flow increase when the front guide vane is installed, which indicates that a mixed flow fan could be increased in flow and improved in performance if the guide vanes are installed. Rear guide vane is better than front guide vane in the aspect of improving mass flow. Take front guide vane as an example, adopting the NUMECA for numerical simulation, the result is as similar as the experiment’s.

Abstract: Flow boiling heat transfer in vertical narrow annular channels with dual tube heating has been experimentally investigated using distilled water as the working fluid. The experiments were made on two types of test section within the experimental range: heat flux, 40-210 kW/m2; mass flux, 45-180 kg/m2s; system pressure, 2-3.5MPa; gap size, 2mm and 3mm. The intention of this paper is to experimentally survey the flow boiling dryout mechanism of liquid film on the tube wall of vertical narrow annular channels with heated length of 1300mm. The values of dryout temperature, while the heating rate reaches critical heat flux, could be measured in the experiments. And the values of the critical quality xcr were calculated by thermodynamic equilibrium. The main factors which have influence on critical quality, such as mass flux, dimension of the narrow channel, heat flux and water inlet temperature were analyzed based on the experimental data. The empirical correlation which used to calculate critical quality in vertical narrow annular channels in similar conditions was given here. The calculation results of this correlation were compared with experimental data and agreed well with it while the deviation is less than 15%.

Abstract: Two-dimensional nanomaterials are becoming the focus of intensive research due to their novel physical properties and the potential applications in nanodevices. We define a quantum spectrum function using the eigenvalues and the eigenfunctions in the system of two-dimensional nanomaterials. We find that the Fourier transform of the quantum spectrum function reveals a lot of information of the classical orbits from one point to another for a particle in the two-dimensional nanomaterials. These results give new evidence about the classical-quantum correspondence. All the methods and results can be used in a lot of other systems, including some one-dimensional and three-dimensional systems. The researches about these systems are very important in the field of applied science.