摘要：
The objective of this paper is to investigate the effect of rapid thermal cycling on microstructure and optical property (luminous flux and luminous efficiency) of high power light emitting diode (LED) by induction heating. Under an application of induction heating as rapid heating source, the specimens that were being non-operating and operating life tests in the experiment were rapidly heated and cooled based on a control system that employs a fuzzy logic algorithm, respectively. The optical performances, including luminous flux, luminous efficiency and radiant power of two kinds of LED specimens were compared and analyzed. It was found that the rapid thermal cycling have similar evident influence on them. The results showed that the color purity of LED was also descended, the correlated color temperature (CCT) was also risen, but their changing rate and extents are different. The high and low temperature distribution in LED chip was simulated by finite element modeling (FEM) which is helpful for the failure analysis and design of the reliability of the LED packaging. The microstucrue of LED chips are analyzed after different rapid thermal cycling time. The results are showed that rapid thermal cycling can affect greatly the LED properties and interface microstructures. All the results indicate that this approach to rapid thermal cycling by using rapid heating source is feasible to investigate the optical performance of high power LED, so it can also effectively verify the reliability of LED devices.
摘要：
The movement model of self-adjusting bolt is built in this paper, then the kinematical and mechanical analysis is taken to determine the movement of bolt under the converters working condition.Via the mechanical model analysis of self-adjusting bolts, the load applied to the self-adjusting bolt support including the static weight load of converter and steel liquid, the tilting torque, the dynamic load produced by frequent startup, brake, impact, and the boiling of steel liquid is calculated to determine the distribution of load forcing on the three groups of the self-adjusting bolt. According to the results of stress analysis, the bolt facing tapping hole is the most dangerous when converter tilts 63°. The maximum torque is 281.5101tm.
摘要：
Converter is the main equipment in steel making, and its work reliability decides the security and economy of steel production. Therefore, how to design and test analysis of converter has been an important subject of industry research. Through the static centric calculation of converter, combining independent software, compute dynamic center and dynamic torque of mass in the process of sampling and the tapping of converter. The reliable operation of converter through qualitative analysis are guaranteed by taking necessary measures.
摘要：
The Support Vector Classification(SVC) model was constructed in this study by applying the near infrared(NIR) analysis technology combined with the chemometrics method toclassify and distinguish 11 ty
作者机构：
[赵满全; 张宁] College of Mechanical and Electrical Engineering, Inner Mongolia Agricultural University, Hohhot, 010018, China;[史艳花] College of Mechanical and Electrical Engineering, Wuhan Polytechnic University, Wuhan, 430023, China;[杨铁军] Hohhot Branch, Chinese Academy of Agricultural Mechanization Sciences, Hohhot, 010010, China
通讯机构：
College of Mechanical and Electrical Engineering, Inner Mongolia Agricultural University, Hohhot, China
期刊：
Applied Mechanics and Materials,2014年687-691:631-636 ISSN：1662-7482
通讯作者：
Chen, Ge
作者机构：
[Ren X.C.; Zheng X.; Chen G.] Department of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 4300233, China
通讯机构：
[Chen, G.] D;Department of Mechanical Engineering, Wuhan Polytechnic UniversityChina
会议名称：
International Conference on Manufacturing Technology and Electronics Applications
会议时间：
2014-11-08
会议地点：
Taiyuan
会议论文集名称：
Manufacturing technology, electronics, computer and information technology applications: Selected, peer reviewed papers from the 2014 International Conference on Manufacturing Technology and Electronics Applications (ICMTEA 2014), November 8-9, 2014, Taiyuan, Shanxi, China
摘要：
The pressed oil-extraction process is essentially a process of oil seepage through porous cake-shaped media. Permeability of seepage field changes along with the change of porous media caused by press pressure. The change of permeability affects fluid pressure and effective pressure of oil cake pores, which means that porosity is influenced. On the contrary, the change of porosity also has an impact on permeability. The interaction between the seepage and rheology fields is termed as fluid-solid coupling. If rheology of oil cakes is considered, the fluid-solid coupling seepage with the rheological properties is the essence of the pressed oil-extraction process. In the present study, we studied a permeability model based on the deformable and rheological properties of oilseed cakes and the effective stress. The seepage and rheology fields were analyzed by alternative application of the finite difference and finite element methods. The finite element calculation model of nonlinear rheology field was established by the time step-initial strain method. We used flax and cotton seeds as examples to perform numerical simulation and calculate the displacement and pore fluid pressure dissipation of flaxseed and cottonseed oil during the press process.
期刊：
Applied Mechanics and Materials,2014年543-547:164-167 ISSN：1660-9336
作者机构：
[Yu, Nan Hui] School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 430023, China;[Fan, Ji Jun] School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan, 430023, China
会议名称：
International Conference on Vehicle and Mechanical Engineering and Information Technology, VMEIT 2014
会议时间：
19 February 2014 through 20 February 2014
关键词：
Finite Element Method (FEM);Press Cage;Screw Press;Stress Analysis
摘要：
A new method for partial eigenstructure assignment using acceleration and displacement feedback for undamped vibration systems is presented in this paper. Firstly, a necessary and sufficient condition is proposed for the incremental mass and stiffness matrices that modify some eigenpairs while keeping other eigenpairs unchanged. Secondly, based on this condition, an algorithm for determining the required control gain matrices of acceleration and displacement feedback, which assign the desired eigenstructure, is developed. This algorithm is easy to implement, and works directly on the dsecond-order system model. More importantly, the algorithm allows the control matrix to be specified beforehand and also leads naturally to a small norm solution of the feedback gain matrices. Finally, some numerical examples are given to demonstrate the effectiveness and accuracy of the proposed algorithm. (C) 2013 Elsevier Ltd. All rights reserved.
期刊：
IFIP Advances in Information and Communication Technology,2014年420:145-151 ISSN：1868-422X
作者机构：
[Zhang, Ning; Zhao, Manquan] Mechanical and Electrical Engineering College, Inner Mongolia Agricultural University, Hohhot, 010018, China;[Liu, Yueqin] Mechanical and Electrical Engineering of Inner Mongolia Technical College of Mechanics and Electrics, Hohhot, 010070, China;[Shi, Yanhua] College of Mechanical and Electrical Engineering, Wuhan Polytechnic University, Wuhan, 430023, China
会议名称：
7th IFIP WG 5.14 International Conference on Computer and Computing Technologies in Agriculture, CCTA 2013
会议时间：
18 September 2013 through 20 September 2013
关键词：
ANSYS workbench;Double disc mower;Finite element analysis;Optimization design;Virtual Prototyping
期刊：
Applied Mechanics and Materials,2014年530-531:911-914 ISSN：1662-7482
作者机构：
[Yu, Nan Hui; Li, Shi Long; Liu, De Wen] School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 430023, China
关键词：
Finite Element Analysis (FEA);Pressing Screw;Screw Press
摘要：
Screw pressing technology provides a pressing process superior to those traditional ones. Screw press has been used in oil extraction with a long history, both for cold and hot pressing of vegetable oil materials. Pressing screw is the core component of screw press, as a very important working part, its strength is a precondition for ensuring normal operation of the whole machine. Considering the complexity and drawbacks of conventional analysis and check methods for pressing screw, a simplified three-dimensional model of which was set up, then finite element analysis was done, thus obtaining its continuous deformation and stress distribution with the results close to those from theoretical calculation. Hence, this method can be applied to rapidly and correctly find those dangerous positions and existing imperfections of its structure, thus providing valuable data to judge its structural rationality before practical manufacture, so as to make further improvements and optimizations for its structural design.
期刊：
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing,2014年607:6-9 ISSN：0921-5093
通讯作者：
Mei, Q. S.
作者机构：
[Li, J. Y.] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Peoples R China.;[Mei, Q. S.] Wuhan Univ, Sch Power & Mech Engn, Dept Mat Engn, Wuhan 430072, Peoples R China.;[Cui, Y. Y.; Yang, R.] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
通讯机构：
[Mei, Q. S.] W;Wuhan Univ, Sch Power & Mech Engn, Dept Mat Engn, Wuhan 430072, Peoples R China.
关键词：
High temperature property;Composite;Mechanical characterization;Ceramic;Hot pressing;Microstructure
摘要：
Al2O3–Ti2AlN composite with a high volume fraction (~40%) of Al2O3 was successfully fabricated by in situ solid reaction of nanoparticles produced by co-evaporation. The composite, characterized by small Al2O3 particles dispersed homogenously in a fine-grained Ti2AlN matrix, showed a novel combination of high temperature mechanical properties and oxidation resistance.
摘要：
Owing to the excellent tensile strength and corrosion-resistance of fiber reinforced unsaturated polyester composite, it is expected to solve the corrosion problem of building instead of steel bars in some special occasions. Bonding performance between concrete and FRP rebars was studied by pull-out test,the influences of the surface form, anchorage length and diameter of FRP rebar on bonding strength were discussed in detail.
摘要：
In this work, TiC coating on a copper alloy electrode, which is prepared by a special electron-spark deposition process (ESD), was modified by friction stir processing (FSP). The microstructure evolution of the coating was investigated, while the mechanical properties of the coating and interface were measured. The results show that FSP eliminates the cracks within TiC coating and improves the interface bonding between the TiC coating and substrate. The hardness of the FSPed TiC coating is increased about 800 HV by decreasing cracks. The elimination of the cracks within the coating is ascribed to the thermal-mechanical effect on the coating during the FSP. The increase in hardness is attributed to the decreasing number of cracks and the disappearance of columnar Cu grains, which are modified by FSP.
