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the 5th International Conference on mechanical engineering and Mechanics

作者： Yingchun CAO Xuegong HUANG Jiong WANG Yingfu SUN School of Mechanical Engineering Nanjing University of Science and Technology Luoyang Ship Material Research Institute

Electrorheological(ER) damper, a kind of intelligent mechanical device which can adjust the force steplessly by using the controllable characteristic of the electric field. ER damper has many advantages such as simple structure, low power consumption, fast response time and so on, so it has been successfully used in many fields. There are few reports on the study of impact load vibration with ER damper. In this paper, operating principle of ER damper was introduced, and the mechanical model between damping force and controlled electric field based on Bingham model was built. The control system model of ER damper under impact load was built and simulation analysis of Fuzzy-pi control algorithm was completed by use of Simulink. The simulation results show the Fuzzy-pi control algorithm has excellent control effect.

关键词： Impact Load Electrorheological Damper Fuzzy-pi Control Algorithm Simulation

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Verification of flowtex solver using ansys CFX - Examining the permeability prediction method on a range of textile architecture models 16

Verification of flowtex solver using ansys CFX - Examining t...

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16th European Conference on Composite materials, ECCM 2014

作者： Swery, Elinor E. Meier, Reinhold Lomov, Stepan V. Hahn, Christoph Kelly, Piaras Straumit, Ilya Centre for Advanced Composite Materials Department of Mechanical Engineering University of Auckland Private Bag 92019 Auckland New Zealand Institute for Carbon Composites Technische Universität München Faculty of Mechanical Engineering Boltzmannstraße 15 Garching b. MünchenD-85748 Germany Department of Metallurgy and Material Engineering Katholieke Universiteit Leuven Leuven Belgium Department of Engineering Science University of Auckland Private Bag 92019 Auckland New Zealand

Predicting reinforcement textile permeability properties through simulation approaches is a repeatable and robust method which can capture complex behaviours during Liquid Composite Moulding processes. This paper compares the predicted permeability values obtained from conducting flow simulations on the same textile models using the FlowTex and Ansys CFX solvers. An automated tool, which has been developed and is presented, has been used for this, performing flow simulations on WiseTex generated meshes using Ansys CFX. This tool converts the voxel files exported from WiseTex into voxel meshes compatible with Ansys, representing the volume of resin within the unit cell. The voxel meshes are automatically cleaned, deleting any floating elements and the boundary regions are defined based on the unit cell size. The permeability comparison results for a range of idealised textile models are presented. Furthermore, the ability of both solvers to capture variations in unit cell geometric parameters is demonstrated. Finally, both solvers were used to predict the permeability values of unit cell models based on the textile used in the second permeability benchmark exercise [1]and these are compared with the experimental permeability values.

关键词： Textiles

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Special Section on Nanoscale materials, Devices, and Systems for Biosensing, Biomanipulation, and Biofabrication

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Journal of Nanotechnology in engineering and Medicine 2014年第4期5卷 040201页

作者： Fu, Jianping Fan, Donglei Department of Mechanical Engineering University of Michigan Ann ArborMI United States Materials Science and Engineering Program Department of Mechanical Engineering University of Texas at Austin AustinTX United States

This special section of ASME Journal of Nanotechnology in engineering and Medicine focuses on reporting state-of-the-art nanoscale materials, devices, and systems for advanced biosensing, biomanipulation, and biofabrication. Such nanoscale materials, devices, and systems can be organic, inorganic, and hybrid, and their applications for advanced biosensing, biomanipulation, and biofabrication have generated significant impact for important biology and biomedical applications. Nanotechnology has seen rapid progress in recent years, with advanced capabilities to generate and manipulate precisely engineered nanoscale organic and inorganic materials and their assemblies pointing toward the emergence of disruptive functionalities for diverse biological and biomedical applications. Furthermore, nanofabricated devices and systems such as nanofluidics, nanoelectromechanical systems, and nanophotonic structures with critical dimensions comparable to the molecular scale open up new possibilities for direct observation, manipulation, and analysis of biomolecules, thus providing a novel basis for ultrasensitive and high-resolution sensors and diagnostic systems. Nanoscale surface patterning...

关键词： Nanoscale phenomena Nanotechnology

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Formability prediction of aluminum sheet alloys under isothermal forming conditions 42

Formability prediction of aluminum sheet alloys under isothe...

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42nd North American Manufacturing Research Conference 2014, NAMRC 2014

作者： Abovyan, Tigran Kridli, Ghassan T. Friedman, Peter A. Ayoub, Georges College of Engineering and Computer Science University of Michigan-Dearborn DearbornMI United States Ford Research and Innovation Center Ford Motor Company DearbornMI United States Mechanical Engineering Program Texas A and M University at Qatar Doha Qatar

ISBN: (纸本)9781634394178

The forming limit diagram (FLD) is a tool that is used by automotive engineers to assess and compare the formabilities of sheet metals. The FLD is experimentally determined by portraying the biaxial strain distribution in the plane of the sheet under proportional loading paths. However, experimental determination of the FLD is time consuming. With increasing interest in warm forming of aluminum sheets, the process for determining the forming limit diagram is further complicated and more cumbersome as the forming limits change with increasing temperatures. Accordingly, a process for predicting the FLD based on the material constitutive model is of interest. This paper presents a finite element based criterion for predicting the FLD under isothermal conditions. The paper provides experimental validation for the predicted results using select automotive 5xxx series aluminum alloys. The findings indicate that the developed criterion can adequately predict the forming limit for each strain path. Copyright © (2014) by the Society of Manufacturing Engineers All rights reserved.

关键词： Aluminum sheet

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Strengthening of 3D Printed Robotic Parts via Fill Compositing

Strengthening of 3D Printed Robotic Parts via Fill Compositi...

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IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Joseph T. Belter Aaron M Dollar Yale University Department of Mechanical Engineering & Material Science New Haven CT 06511 USA

ISBN: (纸本)9781479969357

Three-dimensional printing technology, also known as additive manufacturing, has shown a significant increase in popularity as the cost of printers comes down and part accuracy and build quality continually improves. To date, the major limitation of the various additive manufacturing techniques is the limited range of print materials and properties, with 3d printed parts unable to be used in most load-bearing applications in robotics and other domains. In this paper, we present a technique for increasing the strength of 3d printed parts while retaining the benefits of the process such as ease and speed of implementation and complex part geometries. By carefully placing voids in the printed parts, which are later filled with higher-strength resins, we can improve the overall part strength and stiffness by up to 45% and 25%, respectively. We show three-point bend testing data comparing solid printed ABS samples with those strengthened through the fill compositing process, as well as examples of 3D printed parts used in robotic applications.

关键词： Printing, Three-Dimensional Reinforcement Printed materials FILL complex part Additive manufacturing Three Dimensions PART robotics Popularity

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Fatigue Crack Growth in Aluminum Lithium Riveted Lap Joints

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Procedia engineering 2014年 74卷 413-416页

作者： Babak Anasori Franklin Saillot David Stanley Jonathan Awerbuch Tein-Min Tan Drexel University Department of Material Science and Engineering Philadelphia PA 19104 USA Drexel University Department of Mechanical Engineering and Mechanics Philadelphia PA 19104 USA

Fatigue crack initiation sites and the subsequent fatigue crack growth rate in riveted lap joints made of 2198-T8 Al-Li alloy were investigated through fractographic examinations. Two crack initiation sites were identified: 1) near the rivet holes and 2) at multiple sites along the faying surface. Fatigue crack tunneling was developed during the fatigue crack progression in all specimens, yielding final ductile fracture during the catastrophic fracture of the specimens. The fracture surface morphology exhibited shallow fatigue striations. The second phase constituents did not affect the fracture surface morphology. Multiple micro cracks and long interlaminar cracks occurred. Stereo (3-D) fracture surface morphologies indicate a meandering fracture surface, with local fatigue crack progressing along multiple directions and at different rates. Average crack growth rate ( da/dN ) along the width, thickness of the specimens and the feather lines were recorded, showing the effect of grain direction, alloying, and stress level on the fatigue crack growth behavior. The number of cycles to failure was also affected by the grain direction.

关键词： AA2198-T8 Fatigue crack growth Fractography Fatigue striation

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A multispectral nondestructive approach for imagebased damage monitoring 29

A multispectral nondestructive approach for imagebased damag...

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29th Annual Technical Conference of the American Society for Composites, ASC 2014;16th US-Japan Conference on Composite materials;ASTM-D30 Meeting

作者： Vannaimparambil, P.A. C, J. R, A. Bartoli, I. Kontsos, A. Mechanical Engineering and Mechanics Department Drexel University 3141 Chestnut Street PhiladelphiaPA19104 United States Material Science and Engineering Department Drexel University 3141 Chestnut street PhiladelphiaPA19104 United States Civil Architectural and Environmental Engineering Department Drexel University 3141 Chestnut Street PhiladelphiaPA19104 United States

ISBN: (纸本)9781605951249

Damage in composite materials even in well-controlled laboratory conditions is a stochastic process. The main reason for the variability in observed damage patterns is primarily the spatial randomness of damage initiation sites, which is a direct result of the current manufacturing procedures for common composite materials. In an effort to provide a practical method for visualizing damage progression that could assist mechanical and damage behavior characterization, the combined use of two emerging non-contact and full field nondestructive methods is presented in this article. Digital Image Correlation (DIC) and passive Infrared Thermography (IR) can be readily applied during testing of composite materials. The advantage of both techniques is that they provide high resolution deformation and thermal fields, respectively. Such fields especially under varying fatigue loading conditions have the potential to provide correlations between macroscopically observed changes in the mechanical behavior and spatially resolved "hot spots", directly related to final failure. Going beyond the simple combined use of the two techniques and based on their individual properties, a path to stitch information extracted from both and perform image-based monitoring of evolving damage in composites is described. Custom data acquisition, noise reduction and post-processing algorithms were created to allow the calculation of features that can provide information related to volume-dependent development of surface damage patterns and their correlations with both mechanical and other nondestructive information (i.e. provided by acoustics). This approach has the potential to provide a quantitative tool for the multispectral description of continuously evolving material states, which if reliably identified can also serve as direct inputs to physics-based computational models for progressing damage quantification and remaining useful life prediction.

关键词： Composite materials

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Hall-sensor-based orientation measurement method in three-dimensional space for electromagnetic actuators

Hall-sensor-based orientation measurement method in three-di...

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2014 IEEE International Conference on Automation science and engineering, CASE 2014

作者： Yan, Liang Zhu, Bo Jiao, Zongxia Chen, Chin-Yin Chen, I-Ming School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Research Institute Beihang University in Shenzhen Shenzhen518000 China Institute of Advanced Manufacturing Technology Ningbo Institute of Material Technology and Engineering Ningbo315201 China School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue Singapore Singapore

This paper proposes an orientation measurement method of a novel permanent magnet spherical actuator with 3D magnet array based on several hall sensors. This measurement method could avoid additional inertial moment and friction, as there is no contact between the measurement system and the rotor. And the accuracy of Hall sensors could be enhanced by the higher flux density produced by the 3D magnet array. A novel distribution of Hall sensors is proposed in this paper. Compared with the magnetic field model formulated analytically, the rotor orientation could be derived from the measured value of flux density by these Hall sensors. Numerical computation is utilized to validate the accuracy of the analytical equations between the orientation of rotor and the measured value of Hall sensors. Also the numerical computation shows that the accuracy of the orientation measurement method is influenced by the 3D magnet array. These researches could be used for subsequent control implementation of the novel permanent magnet spherical actuator. © 2014 IEEE.

关键词： Permanent magnets

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Development of a high temperature transducer backing element with porous ceramics

Development of a high temperature transducer backing element...

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IEEE International Ultrasonics Symposium

作者： Mohammad Hossein Amini Anthony N. Sinclair Thomas W. Coyle Mechanical and Industrial Engineering Department University of Toronto Toronto Canada Material Science and Engineering Department University of Toronto Toronto Canada

In this study, porous ceramics are introduced as a backing element suitable for high temperature transducers. Acoustic impedance and attenuation can be regulated through control of the porosity and pore size, using scattering from micropores as the attenuation mechanism. Porosity is induced by mixing the ceramic powder with polyethylene particles. The polymer component burns during the sintering process and leaves behind spherical voids. Porosity and pore size are controlled through the polymer-to-ceramic weight ratio and poltyethylene particle size, respectively. In this manner, a porous mullite material is designed and manufactured to act as the binding agent for a gallium phosphate (GaPO_4) piezocrystal;this yields our goal of a wide-band signal with center frequency of 2.8 MHz and operating temperature up to 700 - 800℃. The design and fabrication process can be employed in manufacturing backing elements for a variety of transducers with specified center frequency and signal bandwidth.

关键词： High temperature ultrasonic transducer backing element porous ceramics ceramic manufacturing

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Growth of anatase and rutile TiO2@Sb:SnO2 heterostructures and their application in photoelectrochemical water splitting

Growth of anatase and rutile TiO2@Sb:SnO2 heterostructures a...

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作者： Park, Sangbaek Lee, Chan Woo Cho, In Sun Kim, Sanghyeon Park, Jong Hun Kim, Hae Jin Kim, Dong-Wan Lee, Sangwook Hong, Kug Sun Department of Materials Science and Engineering Seoul National University Seoul151-744 Korea Republic of Department of Mechanical Engineering Stanford University CA94305 United States Department of Energy Systems Research Ajou University San 5 Woncheon-dong Yeongtong-gu Suwon443-749 Korea Republic of Department of Material Science and Engineering University of California at Berkeley CA94720 United States

We report three-dimensional (3D) nanostructures based on shape- and phase-controlled TiO2 coated transparent conducting oxide (TCO) nanowire array. Core-shell and branched nanostructures were obtained using an aqueous chemical bath deposition (CBD) method at room temperature. Adjusting the pH of a TiCl4 solution is a key factor that determines the morphology of the nanostructure. Spherical TiO2 anatase covered a Sb-doped SnO2 (ATO) nanowire when pH was maintained at a high level. In contrast, branched nanostructures with TiO2 rutile nanorods were synthesized by keeping a TiCl4 solution going down to a low pH. Nanorods were grown epitaxially along the [001] direction on ATO nanowires. Morphological and structural analysis indicates that phases and shapes of the 3D hybrid nanostructure are determined by the pH of the solution and the reaction time. A two-fold higher photoconversion efficiency of rutile TiO2 rod@ATO was obtained under simulated solar illumination compared to that of the anatase TiO2 nanoshell@ATO. These 3D hybrid nanostructures can offer (i) a large surface area and efficient charge transport in the TiO2 nanostructure, and (ii) an effective charge collection path through one-dimensional TCO, which is promising for various areas, including photoelectrochemical water splitting, as well as for application in electronic and photonic nanodevices. © 2013 Hydrogen Energy Publications, LLC.

关键词： Room temperature

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