Advanced Materials Research Vols. 479-481

Abstract: The arm system is the central part in the design of a portable crane. The purpose of this program is to assure that the load moves approximately along the path of the horizontal direction in the process of luffing, through the optimization of the bars’ length of the arm system. Using vectors in the mathematical model, we figured out the coordinates of the bottom point of the truck-beam according to the geometric relationships of the four-bar linkage. With the appliance of proper algorithm and the idea of visualization, we calculated the reasonable length of the bars in MATLAB and transformed the results into software ultimately. The design is suitable for different types of portable cranes, and the software is very convenient and can be used in engineering.

Abstract: In many fields such as wind engineering, ocean engineering, soil engineering and so on, it is obvious that the development of effective methods to generate sample functions of non-Gaussian stochastic processes and fields is of paramount significance for many systems subjected to non-Gaussian excitations. In this paper, neural network technique is proposed for the conditional simulation of non-Gaussian stochastic processes and fields. In machine learning of neural network, interpolation is employed to train finite non-Gaussian samples. As numerical examples, the conditional simulation of non-Gaussian fluctuating wind pressures is carried out through using back propagation neural network and generalized regression neural network respectively.

Abstract: A new kind of swarm intelligence algorithm called stochastic focusing search(SFS) is proposed and applied to optimize sheet metal forming process in this paper. The steps of the optimization procedure include combining numerical simulation technology with orthogonal experiments to provide training samples for BP net, and producing the fitted function as optimization function for SFS algorithm. The validation of the final optimization results by a rectangular box part stamping case shows that this kind of optimization methodology is correct and reliable for the design of deep drawing process. Advantages of the SFS algorithm are demonstrated that SFS has good global searching ability and fast convergence speed in finding optimal solutions, which means the optimization method using SFS algorithm can provide a competitive way of solving the optimization design problems in sheet metal forming.

Abstract: This paper is applied non-linear operators for image enhancing. The efficient algorithm of MRI enhancement is provided by decomposition of localized information at different spatial frequencies. So the MRI edge textures was enhanced while suppresses the noise maximally. Experiment was show more obvious unseen or barely seen features, and the visual effect is improved after the method, and help for diagnosing the state of an illness.

Abstract: In the detailed analysis of the data transmission needs of the intelligent fire control training system, the network management is modeled based on Unified Modeling Language (UML). In order to improve the reliability of network transmission, authentication part is designed in the server side, and a connected state detecting method is proposed, which is based on heartbeat mechanism and with data-carrying. Test results show that the network system has got higher reliability while satisfying the real-time constraints. It can provide certain valuable reference to network system designing of the similar corresponding systems.

Abstract: Molded Interconnect Devices (MID) is an innovative technology which abandoned the conventional board and integrates the mechanical and electronic functions directly on materials. Due to the complex process, the existing MCAD and ECAD do not meet the requirements of MID, so an MID prototype system for design and simulation of 3D layout based on Open CASCADE has been developed in this paper. Through studying on the algorithm of 3D automatic routing, realized the functions of placement of 3D electronic components and 3D automatic routing. Also, simulation for 3D laser direct structuring and placement of electronic components with a six-axis robot has come true after studying manufacturing process of MID.

Abstract: The multi-power grid generation system will be the main technology in the future use of energy. It can provide high quality uninterruptible power supply for users through the grid-connected system of photovoltaic system, wind power, batteries, and gas-fired power and other clean energy source. Due to the instability of energy source system and the special conditions of the energy storage system, an important factor of affecting the multi-power grid generation system is the energy storage system. So, this paper aims to design an optimized battery management system (BMS). It not only can take advantage of solar, wind, gas and other clean energy source but also have an efficient management and maintenance system to batteries, which can reduce the costs of battery maintenance, and improve the battery packs' efficiency. This design has outstanding advantages over low-medium power applications.

Abstract: In order to develop new electrical contact materials with better properties, small amounts of rare earth (RE) oxides were selected as additions into AgSnO2-based composites. The effects of different RE oxide additions with different content in the matrix on the microstructure of AgSnO2, were investigated. In general, the resulting RE oxide-doped materials are found to have better performances than their original ones. Results indicate that the newly developed AgSnO2/La2O3 materials in this paper are leading candidates for environmentally friendly electrical devices and RE oxides would play an important role in improving performance of AgSnO2.

Abstract: In order to improve measurement accuracy and for choosing the best ratio of hole depth to bore (h/d), a model based on 16Mn was setup for studying the influence of different hole depth h and bore d to the coefficients with finite element method (FEM). The stress and strain on hole edge was simulated and the influence of h/d to the strain relief coefficient A, B were studied. By applying different loads, the relation of A, B vs. stress σ was studied under the conditions of σ=1/3σs. The results showed that more accurate coefficients were achieved when h/d was set to 1.25.

Abstract: In the paper, the axial stiffness and bending stiffness of single-layer reticulated shell’s joint are considering together, non-linear beam-column element with rigid springs and rigid ends is taken as the analysis model of members of single-layer reticulated shell, a tangent stiffness matrix of members of single-layer reticulated shell considering joint’s stiffness is derived on the basis of the beam-column theory. In this matrix, not only coupling effects of bending in two axes but also joint’s stiffness and joint’s size are considered, not only the effect of axial force on bending but also the effect of axial force on torsion are considered. All higher order terms in the displacement function are considered. So this matrix is perfect and more precise than the tangent stiffness matrix from C.Oran, and this model can be suited to the non-linear stablity analysis of single-layer reticulated shell.