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Flow visualization of silicon-based micro pulsating heat pipes

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science china(Technological sciences) 2010年第4期53卷 984-990页

作者： QU Jian & wu huiYing Key Laboratory for power Machinery and engineering of Ministry of Education,school of mechanical engineering,shanghai Jiaotong university,shanghai 200240,china Key Laboratory for power Machinery and engineering of Ministry of Education School of Mechanical Engineering Shanghai Jiaotong University Shanghai China

Two sets of silicon-based micro pulsating heat pipes(SMPHPs) with trapezoidal cross section having hydraulic diameters of 352 μm(#1) and 394 μm(#2) respectively were fabricated for the first time using MEMS *** FC-72 as the working fluid,the start-up,steady operation state,as well as flow patterns were investigated using a CCD *** was found that the start-up process of these two SMPHPs was rather *** the start-up period,no nucleation was observed,and the vapor plugs at the evaporator U-bends were formed mainly due to the breakup of liquid *** the steady operation state,self-sustained oscillation with large amplitudes dominated the flow behavior when the inclination angle varied from 10° to 90°,but the nucleate boiling and bulk circulation were observed only in SMPHP #*** bubbly,slug/plug,annular/semi-annular,and wavy-annular flows were observed in both two SMPHPs,the injection flow only appeared in SMPHP #2.

关键词： micro pulsating heat pipe flow visualization start-up flow pattern injection flow

Simulation on the Melt Flow in Laser Full Penetration Welding with a Model Including a Non-Rotational Symme-try Keyhole Based on Energy Balance

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稀有金属材料与工程 2011年第S4期40卷 120-124页

作者： Zhang L J1,Zhang J X1,wu B1,2,Chen L2,Gong S L2,Wang H R3 1 State Key Laboratory of mechanical Behavior for Materials,Xi’an Jiaotong university,Xi’an 710049,china2 power Beam Processing Dept.,Avic Beijing Aeronautical Manufacturing technology Research Institute,Beijing 100024,china3 school of Energy and power engineering,Xi’an Jiaotong university,Xi’an 710049,china Xi An Jiao Tong Univ Sch Energy & Power Engn Xian 710049 Peoples R China Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China Avic Beijing Aeronaut Mfg Technol Res Inst Power Beam Proc Dept Beijing 100024 Peoples R China

A three dimensional model including a non-rotational symmetry keyhole of which the geometry is calculated base on the energy balance at keyhole wall is created to simulate the heat transfer and fluid flow within the molten pool during laser full penetration welding of titanium alloy *** order to take into account the effects of multiple reflections within the keyhole,a ray tracing method is employed and the coordinate dependent heat flux obtained is exerted on keyhole wall during the simulation on the heat transfer and fluid flow within molten ***,the computed weld cross sectional profile is compared with the experimental result to verify the model and it is fond that the simulation result is consists with experimental result.

关键词： laser welding titanium alloy non-rotational symmetry keyhole simulation

Simulation and Optimization of Amplitude-adjusting Performance of Crane with Virtual Prototyping technology

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武汉理工大学学报 2006年第S3期28卷 908-912页

作者： wu Zhen~1 YU Meng~2 DENG Mingxing~1 (1.power & mechanical school,wuhan university,wuhan 430072,china, 2.school of Legistics engineering,wuhan university of Technolegy,wuhan 430063,china) power & mechanical school Wuhan UniversityWuhan 430072China school of Logistics engineering Wuhan University of TechnologyWuhan 430063China

In the design of crane,designers often have to study the trajectory of amplitude-adjusting of *** tradition- al methods,illustration and analytics both show their *** this paper,the simulation of process of amplitude-adjusting is presented and the optimization is also performed with virtual prototyping *** the comparison of original solution and optimal solution,the effectiveness of this technique is *** the platform ADAMS/View,the interactive optimization can be performed in a visual,intuitive and credible way,which deserves to be introduced to the design of crane.

关键词： virtual prototyping ADAMS/View amplitude-adjusting

Chaotic Characteristics of NC Table based on Phase Space Reconstruction

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Chaotic Characteristics of NC Table based on Phase Space Rec...

Acoustic impedance characteristics of linear compressors

第二届国际测量仪器与测试自动化学术会议

作者： Wang Linhong~(1 2)wu Bo~2 (1 Department of Mechatronics Nanyang Institute of technology china) (2 school of mechanical science and engineering Huazhong university of science and technology china)

＜正＞The dynamic properties of NC（Numerical Control） table interfere directly with the accuracy and surface quality of work piece machined by CNC（Computer Numerical Control） *** space reconstruction is an effective approach used to research dynamic behaviors of a system with measured time *** means of the theory and method of phase space reconstruction,correlation dimension and maximum Lyapunov exponent,dynamic time series measured from NC table are *** characteristic quantities as power spectrum, phase trajectories,correlation dimension and maximum Lyapunov exponent etc are extracted from measured time series. The chaotic characteristic of dynamic properties of NC table is revealed via various *** a judgment can be formed that NC table is a nonlinear dynamic *** research represents a basis for the dynamic system discrimination of CNC machine.

关键词： NC table chaotic characteristic phase-space reconstruction correlation dimension maximum Lyapunov exponent

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Journal of Zhejiang university-science A(Applied Physics & engineering) 2013年第7期14卷 494-503页

作者： Zhi-hua GAN Long-yi WANG Sheng-ying ZHAO Yu-jing SONG Wei-wei WANG Yi-nong wu Institute of Cryogenics and Refrigeration Zhejiang University school of Information and Electrical engineering Zhejiang University City College shanghai Institute of Technical Physics Chinese Academy of Sciences

The acoustic field of a linear compressor serves to deliver the compression work to the load, such as the connected cold head of a cryocooler; it plays an equivalently important role as the electrical and mechanical parts, especially in the impedance match issue. This paper studies the acoustic impedance characteristics of a linear compressor. The parameters including the current, the piston displacement, the pressure amplitude, the electrical power dissipation, the power factor, the pressure-volumetric (PV) power delivered, and the efficiency are theoretically and experimentally investigated. Different from previous theoretical studies, optimization for the operations away from the resonance is also included. More general optimization results imply relevance between thermoacoustic engines and linear compressors. The predicted results are validated by the experiments performed on a linear compressor with an adjustable resistive-capacitive (RC) acoustic load. The comparisons between the calculations and the measurements are presented and analyzed. The results provide deeper insight into the mechanism of the linear compressor and the impedance match in a cryocooler system.

关键词： Linear compressor Acoustic impedance Resistive-capacitive (RC) load

Preparation of(Lu,Y)_(3)(Al,Sc,Cr)_(2)Al_(3)O_(12)phosphor ceramics with high thermal stability for near-infrared LED/LD

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Journal of Advanced Ceramics 2024年第3期13卷 354-363页

作者： Yuelong Ma Xingcan Li Lan wu Chenyang Shao Boqiang Zhang Tao Pang Lili Lu hui Qiu Ye Tian Guilu Wang Yanbo hui Qianwen Guo Daqin Chen school of mechanical and Electrical engineering Henan University of TechnologyZhengzhou 450001China Huzhou Key Laboratory of Materials for Energy Conversion and Storage College of ScienceHuzhou UniversityHuzhou 313000China College of Physics and Energy Fujian Normal UniversityFuzhou 350117China SongShan Laboratory Zhengzhou 450046China College of Food science and engineering Henan University of TechnologyZhengzhou 450046China school of mechanical engineering Zhengzhou University of Science and TechnologyZhengzhou 450064China

Near-infrared(NIR)phosphor-converted light-emitting diodes/laser diodes(LEDs/LDs)are prospective lighting sources for NIR ***,developing NIR phosphor materials with desired thermal robustness and high photoelectric efficiency is a crucial challenge for their *** this work,based on the cationic radius matching effect,a series of(Lu,Y)_(3)(Al,Sc,Cr)_(2)Al_(3)O_(12)NIR phosphor ceramics(LuYScCr NIR-PCs)were fabricated by vacuum *** thermal stability(95%@150℃)was obtained in the prepared NIR-PCs,owing to their weak electron-phonon coupling effect(small Huang-Rhys factor).Being excited at 460 nm,NIR-PCs realized a broadband emission(650-850 nm)with internal quantum efficiency(IQE)of 60.68%.Combining NIR-PCs with LED/LD chips,the maximum output power of the encapsulated LED prototype was 447 mW@300 mA with photoelectric efficiency of as high as 18.6%@180 mA,and the maximum output power of the LD prototype was 814 mW@2.5 *** working temperatures of NIR-PCs were 70.8℃@300 mA(LED)and 102.8℃@3 A(LD).Finally,the prepared NIR-PCs applied in food detection were verified in this study,demonstrating their anticipated application prospects in the future.

关键词： thermal stability electron phonon coupling effect photoelectric efficiency near-infrared phosphor ceramics(NIR-PCs) NIR light-emitting diode/laser diode(LED/LD)prototype

Experimental Teaching System of Series-parallel Hybrid power Vehicle

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Experimental Teaching System of Series-parallel Hybrid Power...

2009 9th International Conference on Electronic Measurement & Instruments（ICEMI’2009）

作者： Ruiming wu 1 Deyu Song 2 1.school of mechanical & Automotive engineering Zhejiang university of science and technology Hangzhou Zhejiang Province china 2.school of mechanical & Automotive engineering Zhejiang university of science and technology Hangzhou Zhejiang Province china

Hybrid electric vehicle are one new energy resources vehicle. Hhbrid power experimental teaching system was developed as part of auto *** experimental teaching system is on the basis of the use of simulation technology, CAN fieldbus, VBA technology and other relevant information processing. For vehicle students or new employees, the system is an user-centered, open and programmable test method. Based on the frame of simulation experiment, the article developed one realizable economic theory of simulation experiment method in Series-parallel hybrid power training *** theory was helpful for power test, power hybrid and hybrid power manipulate .

关键词： Series-parallel hybrid auto experiment simulation experiment teaching system.

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一拖三变频空调系统建模方法及控制研究

系统仿真学报 2004年第10期16卷 2123-2127页

作者：陈武蔡振雄周兴禧集美大学轮机工程学院福建厦门361021 上海交通大学机械与动力工程学院上海200030

一拖多变频空调系统由于各蒸发器状态参数间的相互影响,使得系统的控制特性相当复杂,也增加了对系统进行动态建模的难度。为此,本文以一拖三系统为例,采用集总参数法,建立起系统的动态热力学模型;同时提出了系统中变频压缩机和电子膨胀... 详细信息

一拖多变频空调系统由于各蒸发器状态参数间的相互影响,使得系统的控制特性相当复杂,也增加了对系统进行动态建模的难度。为此,本文以一拖三系统为例,采用集总参数法,建立起系统的动态热力学模型;同时提出了系统中变频压缩机和电子膨胀阀的控制策略,引入了吸气压力控制和以电子膨胀阀直接控制室温的思路;制定了带有调整因子的模糊控制方法;利用系统热力学模型对控制策略和方法进行仿真研究,仿真结果表明所提出的控制策略和方法是有效可行的,能取得满意的控制效果。

关键词：一拖三系统动态热力学模型控制吸气压力

超级电容和电池相结合的HEV动力和经济性仿真研究

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系统仿真学报 2008年第23期20卷 6529-6534页

作者：董悦航殷承良张建武陈俐上海汽车集团股份有限公司商用车技术中心上海200438 上海交通大学机械与动力工程学院上海200240

采用理论和实验数据相结合的方法,利用Cruise软件对装配有超级电容和电池相结合使用的并联混合动力大客车SWB6105HEV进行了仿真建模,对其动力性经济性进行了仿真分析,在仿真分析的基础上进行了道路试验验证。仿真和试验结果表明,混合动... 详细信息

采用理论和实验数据相结合的方法,利用Cruise软件对装配有超级电容和电池相结合使用的并联混合动力大客车SWB6105HEV进行了仿真建模,对其动力性经济性进行了仿真分析,在仿真分析的基础上进行了道路试验验证。仿真和试验结果表明,混合动力大客车可以准确、合理地实现各种预定的控制功能。燃油经济性比原型车有较大提高。仿真分析很好的为混合动力大客车以后的设计开发、控制策略优化发提供了理论依据。

关键词：并联混合动力城市公交车动力性燃油经济性仿真超级电容