会议名称:
International Conference on Mechanical, Material Engineering (MME 2013)
会议时间:
NOV 23-24, 2013
会议地点:
Hubei Univ Automot Technol, Shiyan, PEOPLES R CHINA
会议主办单位:
Hubei Univ Automot Technol
会议论文集名称:
Applied Mechanics and Materials
关键词:
manipulator;simulation;kinematics analysis
摘要:
On the basis of calculation, kinematics analysis and simulation were carried out on a hydraulic manipulator by using the positive solution of manipulator's position. The calculation results can be intuitive to inspect the kinematic characteristics of the manipulator structure, and provide the basis for the design of the control system.
摘要:
We report the synthesis of ceria nano-octahedrons using a simple yet efficient hydrothermal technique free of surfactant and template. A comprehensive microscopic characterization reveals that the nano-octahedrons exposed with eight {1 1 1} planes have shape corners and well-defined edges at the nanoscale. Atomic-resolution imaging uncovers that a couple of atomic layers are disappeared at corner, the atomic density of oxygen is reduced at surface, and there occur stacking faults inside the nano-octahedrons, which should have implications for our understanding of catalytic activity of ceria. We also propose a growth mechanism for the nano-octahedrons and provide an explanation to the easy formation of nano-octahedrons with the eight {1 1 1} facets. (C) 2014 Elsevier B.V. All rights reserved.
期刊:
Journal of Physical Chemistry C,2014年118(8):4437-4443 ISSN:1932-7447
通讯作者:
Chen, Chunlin
作者机构:
[Fan, Xiangfang; Chen, Yong; Qiu, Changjun] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Chen, Chunlin; Lv, Shuhui; Wang, Zhongchang; Chen, Yong] Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Aoba Ku, Sendai, Miyagi, Japan.;[Chen, Chunlin] Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi, Japan.
通讯机构:
[Chen, Chunlin] T;Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi, Japan.
摘要:
We investigate, by a systematic first-principles calculation, the surface energies of ceria {100} crystal planes with adsorption of 13 kinds of nonmetallic elements and nine kinds of metallic elements. We predict theoretically that adsorption of nonmetallic B, C, F, Si, P, S, Cl, Br, OH, and I and metallic Sr, La, Mg, Na, K, Y, Ca, and Ba can stabilize the ceria {100} planes through lowering their surface energies. Experimentally, we purposely select KOH as a mineralizing agent by taking into account the calculated surface energies and the factors in hydrothermal synthesis, and demonstrate a successful production of cube-shaped ceria nanoparticles of high purity via carefully optimizing the synthesis parameters. Further comprehensive transmission electron microscopy study identifies all the exposure planes of the cube-shaped ceria nanoparticles as the uniform {100} crystal planes. As a result of this unique morphology, the nanoparticles are found to show markedly enhanced UV-absorption capability as compared to either octahedron-shaped ceria nanoparticles or bulk ceria.
作者机构:
[李必文; 张春良] School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;[张春良; 金坤文; 李必文] School of Mechanical Engineering, University of South China, Hengyang 421001, China
通讯机构:
[Zhang, C.-L.] S;School of Nuclear Science and Technology, University of South China, China
作者机构:
[陈磊; 王坚; 李晓华] School of Electronic Science and Engineering, Southeast University, Nanjing, China;[夏振平] College of Electronic and Information Engineering, Suzhou University of Science and Technology, Suzhou, China;[陈磊] School of Physics Science and Technology, Yangzhou University, Yangzhou, China
通讯机构:
School of Electronic Science and Engineering, Southeast University, Nanjing, China
摘要:
The effects of Cu addition on the microstructure and mechanical properties of the as-cast magnesium alloy ZK60 were investigated with optical microscope, SEM, TEM, XRD, EPMA and tensile tester. The mechanism by which the mechanical properties are affected by Cu addition was discussed. The results show that Cu can effectively eliminate the intragranular solute segregations in the alloy, and the grain size of the alloy is decreased considerably with increasing the Cu amount. A ternary eutectic phase MgZnCu with a face-centered cubic structure is identified in the Cu-bearing alloys, which predominantly distributes at the grain boundary and acts as the nucleation sites of microcracks during the plastic deformation process. It is also found that the tensile properties of the alloy firstly increase by the trace addition of 0.5%-1%Cu and then decrease by a further addition up to 2.0%.
作者机构:
[Jia Guo-hai; E Jia-qiang; Gong Jin-ke; Zuo Qing-song; Chen Tao] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.;[Zuo Qing-song] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Zhang, D. M.] Calif State Univ Fresno, Dept Ind Technol, Fresno, CA 93740 USA.
通讯机构:
[E Jia-qiang] H;Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.
摘要:
In order to reveal the mechanics of composite regeneration by coupling cerium-based additive and microwave for a diesel particulate filter, a composite regeneration model by coupling cerium-based additive and microwave for a diesel particulate filter was established based on field synergy theory. Performance evaluation on field synergy and composite regeneration of the diesel particulate filter was conducted by using the vortex crushing combustion and field synergy mathematical models. The results show that the peak temperature of the particulate filter body reaches 1180-1190 K when the regeneration time is 175 s, and there are optimal coordination degree between the velocity vector and temperature gradient of the filter body and the maximum ratio0.56-0.60 of the best burning regeneration region is obtained. Accordingly, the largest regeneration combustion rate inside the particulate filter body and the highest regeneration efficiency at the moment are achieved.
期刊:
Computer Modelling and New Technologies,2014年18(11):1340-1345 ISSN:1407-5806
通讯作者:
Yuan, Fengwei
作者机构:
[Yuan, Fengwei; Zou, Jiazhu; Deng, Qian] College of Mechanical Engineering, University of South China, Hengyang, Hunan, China
摘要:
A numerical simulation for heat exchanger with continuous helical baffles was carried out. The study focuses on the effects of helix angle on flow and heat transfer characteristics, and heat exchanger performance is evaluated by entropy generation number based on the analysis of the second law of thermodynamics. The results show that both the shell-side heat transfer coefficient and pressure drop decrease with the increase of the helix angle at certain mass flow rate. The latter decreases more quickly than the former. The tangential velocity distribution on shell-side cross section is more uniform with continuous helical baffles than with segmental baffles. The axial velocity at certain radial position decreases as the helix angle increases in the inner region near the central dummy tube, whereas it increases as the helix angle increases in the outer region near the shell. The heat exchange quantity distribution in tubes at different radial positions is more uniform at larger helix angel.
作者机构:
[王新林; 李月华; 唐一波; 朱卫华; 陈志勇] Department of Electrical Engineering, University of South China, Hengyang, China;[王新林; 陈冰] Department of Mechanical Engineering, University of South China, Hengyang, China
通讯机构:
Department of Electrical Engineering, University of South China, Hengyang, China
期刊:
Computer Modelling and New Technologies,2014年18(10):462-467 ISSN:1407-5806
通讯作者:
Yuan, Fengwei
作者机构:
[Yuan, Fengwei; Zou, Jiazhu; Deng, Qian] College of Mechanical Engineering, University of South China, Hengyang, Hunan, China
摘要:
Due to the complex structure of nuclear facilities in a high irradiation environment, people are hard to approach it, In view of these situation a fault diagnosis method based on HMM (Hidden Markov Model) of capturing the audio signal while facilities are operating is proposed. With the strong modelling ability, HMM can be applied to analysing such as audio signal non-stationary time signal. By using this method, the original mechanical structures of nuclear facilities are not destroyed. The proposed sensors were needed as few as possible by the whole diagnosis system and which has a simple structure, low cost structure, the fault diagnosis rate is high and so on. State monitoring and fault diagnosis system of complex nuclear power equipment can timely and effective to provide running status and potential failure information for operating personnel, which has a vital significance for the safe and reliable operation of nuclear power equipment.
摘要:
In this paper, the thermal spraying powder, which was made by sintering, was respectively mixed by Cr2O3 and glass glaze at the mass ratio of 85%, 95%, and 100%.The three mixed powders were sprayed on the surface of 45 steel by CP-3000 subsonic spray gun. Then the samples were heated in the resistance furnace until the temperature reached 1050 degrees C. At room temperature,the wear resistance of these three kinds of coatings were investigated along with load and time changing under water lubricating. The impact of glass glaze on coatings was found after analyzing the change of the weight loss of the coatings. The result showed that there was not the shedding of splat except some brittle micro-peeling at the rim of splat and furrow on the surface of 85% and 95% Cr2O3 ceramic coatings. The wear resistance of the coatings was improved with the increase of the percentage of glass glaze, and began to desend when the percentage arrived at a certain degree. It indicated that the wear resistance was the best when the percentage was about 95% in this experiment.
期刊:
Proceedings of the 26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2013,2013年
通讯作者:
Chen, G.J.(cgjsccgj@126.com)
作者机构:
[Chen, Guo-jie; Liu, Xiang-wei; Chen, You-ming; Tan, Ying-ying] College of Civil Engineering, Hunan University, Changsha, 410012, China;[Guo, Xing-guo] School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China;[Chen, Guo-jie] College of Mechanical Engineering, University of South China, Hengyang 421001, China
摘要:
There is an increasing interest to decrease the building energy consumption all over the world. One way is decreasing building energy consumption by optimizing hydrothermal performance of building envelope. Most building materials are porous, composed of solid matrix and pores. Moisture transfer and accumulation within porous building material has an important impact on the hydrothermal performance of building envelope, energy consumption and indoor environment, however often not taken into consideration adequately. This paper focused on the effect of moisture transfer on building energy performance, by predicting moisture transfer in building envelope and analyzing the impact of moisture transfer on thermal conductivity of porous building envelope material. At first, a transient dynamic model for the coupled heat and moisture transfer in porous media was developed with the driving potentials of temperature and air humidity ratio. This model takes into consideration the phase change of water and can deal multi-layers building envelope. And then two typical walls (brick wall and aerated concrete wall) were calculated with this model, and thermal conductivity of three main materials (brick, aerated concrete and cement mortar) was analyzed. The results show that: 1) both the two frequently-used walls are affect by the high temperature and humidity moisture under the hot and humid climate, and both keep high value of moisture content ;2) in the three main materials moisture transfer can affect its thermal conductivity in a great extent.