Advanced Materials Research Vols. 308-310

Abstract: Compiled nc programs, perfect quality parts processing of nc machining process, is compiling personnel, nc machining operation personnel most concern. This paper discusses correct understanding circular interpolation principle and processing technology analysis[1]; When the manual programming how correct establishment self-positioning presended car parts, accurate discriminant number of circular interpolation instructions as an example, this paper expounds the direction of running direction accurately arc discriminant method, remove programming staff for professional too strong and difficult to understand the confusion generated.

Abstract: In this paper, a new method of the preparation of mica composite insulation material without making mica paper is introduced. Firstly, the mica pulp and modified starch is mixed, and then preformed by ultrasonic dispersion, finally formed with three separation steps of hot-pressing. The flexural strength of mica composite insulation material can reach 229.5 N/mm2, the dielectric strength can reach 23.80KV/mm.

Abstract: The modern embedded multimedia electronic devices rely on dynamically-allocated data structures to store and process their data, as a result, the demand of its memory capacity and dynamic are increasing unceasingly. In order to better solve the memory application optimization in embedded device, this paper represents multimedia application’s dynamic data structures optimization flow and improved or modified NSGA-II multi-objective evolutionary algorithm (MNSGA-II), and uses three objective functions: embedded device’s memory accesses, memory use and energy consumption. The MNSGA-II algorithm adopts repeat crowded distance sorting tactics to improve NSGA-II based on keeping the advantage of the original NSGA-II for multi-objective optimization problem. The experiment results show that MNSGA-II has better performance of the convergence and the diversity of solutions than original NSGA-II, and the optimal dynamic data structure implementation is successful by performing our method for one real embedded multimedia device’s memory application.

Abstract: Aiming at the problems of Tucker3 to large-scale tensor when applied to feature extraction, a new factorization based on Tucker3 is proposed to extract feature from the tensors. First, the large-scale tensor is divided into multiple sub-tensors so as to conveniently compute cores of sub-tensors in parallel mode with Matlab Parallel Computing Toolbox; Then, the cores of each sub-tensor are updated for reducing deviation in calculating and the similar characteristics of sub-tensors are clustered to obtain the features. Experiment results show that this methods is able to extract features rapidly and efficiently.

Abstract: In this article, the working conditions and the failure mechanism of the four tubes in Boiler have been studied. On the base of these researches, a new kind of Fe-based/Cr3C2/B-Fe cored wire was designed. And arc spraying technology was used to produce coatings which had high performance and price ratio. The results of test show that the cored wire was easy sprayed with arc spray equipment. The coatings have dense microstructure, good bond with substrate, and excellent wear-resistance and corrosion-resistance at high temperature.This coating can prolong the using life of heated tubes of circulating fluidized bed boiler effectively and is worthy to be widely used in industry.

Abstract: The 6012 type aerial work platform is mainly used in the construction of steel structure occasions, and the overall and local stability of the studies to ensure construction safety and reduce accidents are of great significance. In this paper, I apply finite element analysis software ANSYS to model the hydraulic legs, and conduct static structural analysis of the hydraulic legs for 6012 type aerial work platform. At last, I will calculate the maximum deformation of single hydraulic legs and maximum stress of the situation in the maximum stress conditions, compared with the theoretical values and the actual test results.

Abstract: An actual packaging structural of high power three-chip white LED lamp is designed. The highest temperature of LED chip is 111.2°C, and the temperature range of heat sink is 72.6°C～73.8°C by finite element method (FEM). The respective temperature of lead frame and heat sink are 76.0°C and 71.0°C, which are measured by the thermocouples experiment. Based on the consistency between simulation results and experiment data, considering the steady temperature distribution of the lamp and heat transfer theory, several optimization methods are proposed. The effects of copper pad dimension, solder paste area and natural convection coefficient on the temperature field distribution are calculated.

Abstract: The parameters influencing the whirling vibration characteristic is more for the CPP (Controllable-Pitch Propeller) propulsion shafting, comparing to the traditional shafting. Verified by a ship’s CPP propulsion shafting, the method of transfer matrices is used for analyzing whirling vibration, by building a hybrid model fosr lumped parameter elements and distributed parameter elements. Then the parameters influencing the whirling vibration characteristic are analyzed, which could provide evidence for the analysis on the whirling vibration for the CPP propulsion shafting.

Abstract: This paper has given hardware configuration of monitoring system based on the process of the waste heat recovery system. It has described S7-300 PLC software design of the lower computer, and has created monitoring interface of the waste heat recovery system based on configuration software WinCC. In practice, the monitoring system has high reliability, friendly interface, and convenient operation is very suitable for waste heat recovery industry.

Abstract: Amorphization and crystallization behaviors of Ti55Al45 powders during mechanical alloys (MA) and subsequent Spark Plasma Sintering are studied. It is found that the nanocrystallization process of the Ti-Al alloy proceeds and the sintering temperature can control the microstructure of alloy. The sintering of the compacts is carried out at the temperatures of 1100—1200°C with a compaction pressure of 30MPa and a heating rate of 30°C min-1. Specimens with high densities and approaching the equilibrium state can be obtained in short time of 180s by spark sintering than conventional sintering. Such shorter high temperature is important to prevent grain growth. The microstructures of the alloy contains equiaxed gamma TiAl with sub-micron grain size and small amount alpha Ti3Al phase.