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Fan flutter computations using the harmonic balance method

Fan flutter computations using the harmonic balance method

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作者： Bakhle, Milind A. Thomas, Jeffrey P. Reddy, T.S.R. NASA Glenn Research Center Cleveland OH 44135 United States Duke University Durham NC 27708 United States University of Toledo Toledo OH 43606 United States Structures and Dynamics Branch United States Dept. of Mechanical Engineering and Materials Science United States Mechanical Industrial and Manufacturing Engineering United States

ISBN: (纸本)9781563479434

An experimental forward-swept fan encountered flutter at part-speed conditions during wind tunnel testing. A new propulsion aeroelasticity code, based on a computational fluid dynamics (CFD) approach, was used to model the aeroelastic behavior of this fan. This three-dimensional code models the unsteady flowfield due to blade vibrations using a harmonic balance method to solve the Navier-Stokes equations. This paper describes the flutter calculations and compares the results to experimental measurements and previous results from a time-accurate propulsion aeroelasticity code.

关键词： Aeroelasticity

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Recycling of electronic wastes: Degradation and combustion

Recycling of electronic wastes: Degradation and combustion

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Extraction and Processing Division - EPD Congress 2008 - Held during TMS 2008 Annual Meeting and Exhibition

作者： Lifeng, Zhang Xiangjun, Zuo Kers, Jaan Peetsalu, Priidu Shengming, Xu Dept. of Materials Sci. and Engr. Missouri University of Science and Technology 223 McNutt Hall Rolla MO 65401 United States Trondheim Norway Faculty of Mechanical Engineering Tallinn University of Technology Estonia Tsinghua University Beijing China

ISBN: (纸本)9780873397155

In this paper, firstly recycling methods of Printed Circuit Boards (PCBs) were briefly reviewed. Then PCB materials from a waste printer and waste TV were heated in TG/DTA and MS machines with the aim of separating and recovering the organic and metallic materials. The effects of top temperature, holding time, gas flow rate, heating rate were investigated. Synthetic air and argon were used as working gases respectively. The mass loss, conversion fraction with the temperature, reaction temperature and activation energy were summarized.

关键词： Flow of gases

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Single-point diamond turning of plasma-nitrided stainless steel

Single-point diamond turning of plasma-nitrided stainless st...

引用

作者： Chao, Choung-Lii Chen, Chun-Chieh Chang, Chia-Jong Dong, Hanshan Ma, Kung-Jeng Hsu, Wei-Yao Huang, Kuo-Cheng Chao, Chung-Woei Department of Mechanical Electro-mechanical Engineering Tam-Kang University Taipei Taiwan Department of Metallurgy and Materials University of Birmingham Birmingham B15 2TT United Kingdom Dept. of Mechanical Engineering Chung Hua University Hsin Chu Taiwan Instrument Technology Research Center Hsinchu Science Park Hsinchu Taiwan Department of Information Management Hsing-Wu College Taiwan

Stainless steel and other ferrous metals are normally classified as not diamond turnable for the unacceptable tool wear caused by the thermal-chemical reaction between diamond and ferrous metals. In the present research, stainless steel specimens were plasma nitrided at a relatively low temperature (4N. Diamond turning experiments were subsequently carried out under the following machining conditions: single crystal diamond tool, cutting speed up to 180 m/min, cut dept. up to 5μm and light mineral oil as the cutting fluid. The results showed that, given the same machining conditions, while rapid tool wear and poor surface finish were obtained when turning the as-received stainless steel, surfaces with Ra better than 3nm and no obvious tool wear were achieved when turning the plasma nitrided specimens.

关键词： Stainless steel

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THE effect of residual stress and microstructure on distortion in thin welded steel plates

THE effect of residual stress and microstructure on distorti...

引用

2007 ASME Pressure Vessels and Piping Conference, PVP 2007

作者： Davies, C.M. Lightfoot, M.P. O'Dowd, N.P. Wimpory, R.C. Dye, D. Bruce, G.J. Béreš, M. Oliver, E. Nikbin, K.M. Dept. of Mechanical Engineering Imperial College London South Kensington Campus London SW7 2AZ United Kingdom Marine Science and Technology University of Newcastle Newcastle Upon Tyne NE1 7RU United Kingdom Dept. of Mechanical and Aeronautical Engineering University of Limerick Ireland Hahn-Meitner-Institut Glienicker Strasse 100 D-14109 Berlin Germany Dept. of Materials Imperial College London South Kensington Campus London SW7 2AZ United Kingdom ISIS Facility Rutherford Appleton Laboratory Chilton Didcot OX11 0QX United Kingdom

ISBN: (纸本)0791842843

The current trend in ship construction is to reduce the thickness of the ship panels, in order to minimize weight and maximize vessel speed. The ship panels of interest consist of 4 mm thick butt welded plates. This reduction in panel thickness may lead to excessive plate distortion during welding, resulting in significant additional costs during assembly. A ferritic-pearlitic DH-36 steel is used, in which phase transformations during welding may affect the distortion and stress states observed. Two large plates, representative of ship panels, have been butt welded using a metal inert gas (MIG) process. The temperature histories have been recorded during welding and the resulting distortion profile has been obtained using digital photography. Neutron diffraction measurements have been performed to determine the residual stress state in the plates before welding, due to e.g. processing and laser cutting, and after butt welding of the plates. Reference matchsticks from the weld, heat affected zone (HAZ) and parent plate have been taken from similar locations in nominally identical plates and measured to obtain the strain/stress free lattice parameter, a0. A Rietveld analysis has been performed on the diffraction data. Post welding, hardness surveys have indicated the microstructural variation in the weld, parent plate and HAZ. Results from these on-going studies are presented which identify the key factors responsible for thin plate distortion. Copyright © 2007 by ASME.

关键词： Residual stresses

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In-situ UHV TEM investigation of the reduction of Cu 2O islands on Cu(100) surfaces

In-situ UHV TEM investigation of the reduction of Cu 2O isla...

引用

2008 MRS Fall Meeting

作者： Zhou, Guangwen Dai, Weiying Yang, Judith C. Dept. of Mech. Eng. and Multidisc. Prog. in Mat. Sci. and Eng. State University of New York Binghamton NY 13902 United States MR Physics Center Department of Radiology Harvard University Boston MA 02215 United States Department of Mechanical Engineering and Materials Science University of Pittsburgh Pittsburgh PA 15261 United States

ISBN: (纸本)9781615677726

In situ ultrahigh vacuum (UHV) transmission electron microscopy (TEM) is utilized to study the thermal reduction of Cu 2O nanoislands on Cu(l00) surfaces. A linear decay behavior of the oxide islands is noted from in situ visualization of the oxide reduction. Complete reduction of the oxide islands leads to the formation of surface craters. Kinetic Monte Carlo (KMC) simulations are employed to elucidate the growth processes of the surface craters. © 2009 materials Research Society.

关键词： High resolution transmission electron microscopy

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Plasma induced damage of aggressively scaled gate dielectric (EOT less than or equal 1.0nm) in metal gate/high-k dielectric CMOSFETs

Plasma induced damage of aggressively scaled gate dielectric...

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46th Annual 2008 IEEE International Reliability Physics Symposium, IRPS

作者： Min, Kyung Seok Kang, Chang Yong Yoo, Ook Sang Park, Byoung Jae Kim, Sung Woo Young, Chadwin D. Heh, Dawei Bersuker, Gennadi Lee, Byoung Hun Yeom, Geun Young SEMATECH 2706 Montopolis Drive Austin TX 78741 United States Department of Advanced Materials Science and Engineering Sungkyunkwan University Suwon. 440-746 Korea Republic of University of Texas Austin TX 78758 United States Dept. of Electronics Engineering Chungnam National Univ. Korea Republic of National Program for Tera-Level Nanodevice Hawolgok-dong Sungbuk-ku Seoul 136-791 Korea Republic of

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ISBN: (纸本)9781424420506

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Freeform fabrication of organic electrochemical transistors

Freeform fabrication of organic electrochemical transistors

引用

18th Solid Freeform Fabrication Symposium, SFF 2007

作者： Havener, Robin Boyea, John Malone, Evan Bernards, Daniel Defranco, John Malliaras, George Lipson, Hod Dept. of. Mechanical and Aerospace Engineering Cornell University Ithaca NY United States Dept. of. Materials Science and Engineering Cornell University Ithaca NY United States

Solution-processable organic semiconductors can be used to print transistors under ambient conditions which are robust enough to function on flexible substrates, and are useful for inexpensive, disposable, and/or flexible applications. Specifically, organic electrochemical transistors (ECT) function at low voltages and with large feature sizes, making them good candidates for freeform fabricated devices. Here we report the first functional ECTs produced via freeform fabrication on glass substrates. These show robust behavior over at least one hour and several measurement cycles, have a source-drain current of 0.1|iA at -0.5Vsd, which is an order of magnitude larger than the gate (leakage) current, and an on/off ratio of 2 at 0.2Vgate. These preliminary devices have source- drain current three orders of magnitude lower than literature values for similar ECTs. This work has enabled us to study ECT behavior on printable substrates, necessary to ultimately incorporating ECTs into fully integrated freeform fabricated electromechanical devices.

关键词： Drain current

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Development of quantum dot-embedded nanoparticles for biothermal imaging

Development of quantum dot-embedded nanoparticles for biothe...

引用

2007 ASME Summer Bioengineering Conference, SBC 2007

作者： Hanson, Willard L. Michael, Nancy L. Kim, Choong-Un Han, Bumsoo Dept. of Mechanical and Aerospace Engineering University of Texas at Arlington Arlington TX 76019 United States Dept. of Materials Science and Engineering University of Texas at Arlington Arlington TX 76019 United States

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Control of multiple mobile agents via artificial potential functions and random motion

Control of multiple mobile agents via artificial potential f...

引用

ASME 2007 International mechanical engineering Congress and Exposition, IMECE 2007

作者： Kumar, Manish Garg, Devendra P. Zachery, Randy Dept. of Mechanical Industrial and Nuclear Engineering University of Cincinnati CincinnatiOH United States Dept. of Mechanical Engineering and Materials Science Duke University DurhamNC27708 United States Army Research Office RTP NC United States

ISBN: (纸本)0791843033

This paper investigates the effectiveness of designed random behavior in cooperative formation control of multiple mobile agents. A method based on artificial potential functions provides a framework for decentralized control of their formation. However, it implies heavy communication costs. The communication requirement can be replaced by onboard sensors. The onboard sensors have limited range and provide only local information, and may result in the formation of isolated clusters. This paper proposes to introduce a component representing random motion in the artificial potential function formulation of the formation control problem. The introduction of the random behavior component results in a better chance of global cluster formation. The paper uses an agent model that includes both position and orientation, and formulates the dynamic equations to incorporate that model in artificial potential function approach. The effectiveness of the proposed method is verified via extensive simulations performed on a group of mobile agents and leaders. Copyright © 2007 by ASME.

关键词： Decentralized control

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Improved haptic fidelity via reduced sampling period with an FPGA-based real-time hardware platform

Improved haptic fidelity via reduced sampling period with an...

引用

ASME 2007 International mechanical engineering Congress and Exposition, IMECE 2007

作者： Sevcik, Kevin S. Kopp, Emilie O'Malley, Marcia K. Dept. of Mechanical Engineering and Materials Science Rice University HoustonTX77005 United States National Instruments AustinTX United States

ISBN: (纸本)0791843033

Impedance based haptic interfaces face inherent challenges in displaying stiff virtual environments. Fidelity of a virtual environment is enhanced by stiff virtual walls combined with low damping and passive behavior of the interface. However, the stiffness of virtual walls displayed on an impedance based interface is limited by the damping inherent in the controller, the sampling rate of the control loop, and the quantization of the controller's position. Attempting to display a stiffness larger than this limiting value destroys the passivity of the interface, leading to active controller behavior and eventually closed loop instability. We propose a method of increasing the fidelity of a PHANToM Premium 1.0 commercial haptic interface by controlling it via a Field programmable Gate Array (FPGA) both alone and with a Real Time Operating System (RTOS) control system. This custom controller enjoys several benefits over the standard control achieved via a proprietary control card in a Multitasking OS, including reduced system overhead and deterministic loop rate timing. The performance of the proposed FPGA/RTOS controller compares favorably with the performance of an FPGA/Multitasking OS controller. The FPGA/RTOS controller achieves control loop rates an order of magnitude greater than that of the proprietary controller, allowing virtual walls to be displayed with greatly increased stiffnesses, while retaining the passivity and low damping of the PHANToM interface. Copyright © 2007 by ASME.

关键词： Controllers

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