Abstract: The propagation of the stress wave in axial direction during the impact between the front-end-coated projectile and the substrate coated by ceramic films is described by the stress wave theorem. The impact process is numerically simulated by ANSYS/LS-DYNA, where the shell unit is used for precision. The effects of thickness of the front-end coating on the interfacial stress are discussed in detail. Dependence of different ceramic films are also considered. Simulation results show that interfacial normal stress is much greater than tangential stress. The interfacial normal stress is greatest when the thickness of the projectile coating is 0.2 mm. The interfacial tangential stress increases slightly as the thickness of coating increases. Similar stress history in the interface occurs when the acoustic impedance of the films are close. Greater acoustic impedance results in smaller stress.
Abstract: In this study, a system composed of real electrical communication system and virtual machine part has been used on NC machining simulation. By establishing a interface based on socket protocol, communication is established between real CNC systems and virtual machine tools. So, processing information of CNC system can be accurately passed to the virtual machine tools. Virtual machine is driven to work in accordance with the instructions of the CNC system. Experiments show that the system is steady and process is repeatable. With structure diagram of communication based on socket protocol shown, the system can be used to detect the manufacturability of the product design process or debug the electrical equipments more efficiently at low cost. It’s also helpful in testing the reliability of NC code in virtual machining.
Abstract: The purpose of this study is to investigate the effects of two kinds of total contact insoles (TCI). Traditional TCI reflects the shape of foot, while deformed total contact insole(DTCI) was established basing on the shape of footprints on clay prototypes. A female experimenter was asked to exert different loadings on clay prototypes to make footprints. Shapes of the footprints have been recorded by a reverse engineering method. Force distribution results in given preconditions were reflected and recorded for quantified comparison. shapes of two total contact insoles were rebuilt under different loadings. Having deformation of different magnitude over each area as a reference, effect and possibility of further improvement have been explored. Our findings showed that insoles based on larger deformation can be utilized to redistribute peak pressure effectively under normal loading. The results indicates that DTCI in this study can be used as a more important tool in adjusting functions or comfort ratings of shoes.
Abstract: Building a fault tree for the refined oil pipeline on the basis of fault tree analysis method. By analyzing the potential risks existing in the refined oil pipeline, the main sources of risks have been figured out based on FTA. This paper aims to find out the key risk factors existing in the oil pipeline as followed: corrosion, machinery and material failure, the third-party damage and maloperation. The main risk sources and the vulnerable spots are found out through the structural importance analysis of the fault tree, including neglecting the construction supervision, corrosion detection, poor corrosion resistance, operation inspection and supervision and bad alarm system, cathodic protection failure and the third-party damage.
Abstract: The operation phase is not only the longest stage of the life cycle of a project, but also the moment when people accumulates most information of the project. Because of the secular and complexity of property management during the operation period, and as there is large amount of information loss during the several periods before operation, it is very difficult to manage equipments all through the way. Based on the BIM technology, authors build a database of the equipment operation parameters to solve this problem. This paper realizes the real-time monitoring of the update of equipment information, equipment maintenance and fault handling during the operation stage. The research puts forward a new way to improve the standards of property management which will lead to a better economic benefits.
Abstract: In view of target attribute value for different sector number, moreover, also attaches a target constraint condition kind of mix sector multi-attribute decision making question, this paper presents set pair analysis decision-making method. Firstly this paper puts forward three typical interval type attribute value representation; Then using set pair analysis theory, the interval type attribute value unified convert the correlate form, Finally has given complex decision-making criterion function, which collected Conformity degree criteria and Criteria for membership degree. Through the construction plan changes decision-making example analysis shows that this method is a simple and effective method for solving multiple attribute decision making.
Abstract: This paper is intended to describe a new algorithm, which makes entropy function method with Lagrange function and Taylor formula for solving inseparable variables of quadratic programming. Quadratic programming problem are an important in the fields of nonlinear programming problem. Entropy function also called KS function. The nature and related certificate of KS function and its convergence have already been proved at home and abroad. The application of KS function nature for solving quadratic programming is a very good method, and it is one of the advantages of making more constraint programming problem become a single constraint programming problem, and the original problems are simplified. Electing three examples of separated variables for quadratic programming problems, that is cross terms of zero, and then contrasted with the new method. The algorithm resolves implementation of separated variables of quadratic programming. Our numerical experiments show the proposed algorithm is feasible.
Abstract: Motivated by Pachpatte difference inequalities and Abdeldaim integral inequalities, this paper establishes two generalized iterated difference inequalities, which consist of multiple iterated sums and contain both linear terms and nonlinear terms inside the sums. We obtain two new results which provide explicit bounds on unknown functions by difference inequality technique. The inequalities given here can be used as tools in the study of boundedness, uniqueness, stability and boundary value problem of a difference equation, which are important tools in studying of natural science, engineering technology, and the laws of social economic development.
Abstract: This paper invesigates the peak ground acceleration (PGA) and peak ground velocity (PGV) regression equations as well as the PGA or PGV middle values in Chinese seismic intensity scale 2008 (the CSIS 2008), using the Wenchuan earthquake records of China with the full seismic information. Based on the analytical results, the PGA-V method is proposed to assess the instrumental intensity which combines both PGA and PGV. Besides, a problem is raised to further verify and modify the middle values of PGA or PGV for the seismic intensity VI and VII in the CSIS 2008.
Abstract: With the appearance of high temperature resistance alloy steel and the requirement of light weight for vehicles, more and more exhaust manifolds are made from newly developed alloy steel. The changing of material directly affects the design and manufacturing process. To estimate the thermal load of the tight-coupled exhaust manifold, the joint analysis methods of CFD and FEM are put forward to predict the temperature distribution, thermal stress and deformation. Using Computational Fluid Dynamics (CFD) method, gas temperature and convective heat transfer coefficient, adjoining the inside and outside surfaces of the exhaust manifold, are estimated firstly in this paper. Then these results are mapped to the finite element mesh of exhaust manifold, which are created for the heat transfer analysis. At last, thermal stress and thermal deformation analysis are presented by taking nonlinear material properties into account, which provide some reference to evaluate the cooling capacity and structure design of exhaust manifold.