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Inverse kinematics of a dual linear actuator pitch/roll heliostat

AIP Conference Proceedings 2017年第1期1850卷

作者： Joshua Freeman Balakrishnan Shankar Ganesh Sundaram 1PhD Scholar MS Electrical Engineering. Amrita Center for Wireless Networks & Applications (AmritaWNA) Amrita School of Engineering Amritapuri Amrita Vishwa Vidyapeetham Amrita University Kollam Kerala 690515 India 690525 (+91) *** (+001) 415-516-9196 2PhD Associate Dean Head of Department. Mechanical Engineering. Amrita School of Engineering Amritapuri Amrita Vishwa Vidyapeetham Amrita University Kollam Kerala India 690525. (+91)944749080 3PhD Department of Physics. Amrita School of Engineering Amritapuri Amrita Vishwa Vidyapeetham Amrita University Kollam Kerala India 690525. (+91)***

This work presents a simple, computationally efficient inverse kinematics solution for a pitch/roll heliostat using two linear actuators. The heliostat design and kinematics have been developed, modeled and tested using computer simulation software. A physical heliostat prototype was fabricated to validate the theoretical computations and data. Pitch/roll heliostats have numerous advantages including reduced cost potential and reduced space requirements, with a primary disadvantage being the significantly more complicated kinematics, which are solved here. Novel methods are applied to simplify the inverse kinematics problem which could be applied to other similar problems.

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Effect of damping coefficient on power generated & comfort index in energy regenerative damper for automobile suspension system

Effect of damping coefficient on power generated & comfort i...

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International Conference on Renewable Energy Research and Applications

作者： Prashant Eknath Todmal Stefano Melzi Phd candidate Department of Mechanical Engineering Politecnico Di Milano Milan Italy Associate Professor Department of Mechanical Engineering Politecnico Di Milano Milan Italy

ISBN: (纸本)9781479999835

In this paper performance of ElectroMagnetic Damper (EMD) for a car suspension system is analyzed. A 2-D model of a vehicle developed in SimMechanics? was initially used to determine the amount of power wasted by conventional viscous dampers. On the basis of the output of numerical simulations, i.e. force developed and power wasted by viscous dampers, specifications for an ElectroMagnetic damper (EMD) were driven. The 2D model of the vehicle was then interfaced with models of EMDs. This kind of device allows not only to recover energy while damping the relative motion between carbody and unsuspended masses, but also to tune the damping coefficient to alter the response of the vehicle in terms of heave and pitch dynamics. Tuning of EMDs was eventually changed to put into evidence the trade-off between the power generated & comfort levels.

关键词： Power regeneration Comfort Index Damping coefficient Power Spectral Density (PSD) Electro-Magnetic Damper (EMD) Carbody Road surface SimMechanics? Simulink 2-D Model

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A New Volumetric Parameter for a Comparative Finite-Element Analysis of a Six- or Four-Implant Mandibular Total-Arch Rehabilitation

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Open Journal of Stomatology 2016年第1期6卷 12-21页

作者： Alfredo Natali Enrico Bertocchi Andrea Baldini Giuseppe Antonio Mulas Matteo Martinolli Bortolini Sergio DDS Teacher at the PhD “Enzo Ferrari” in Industrial and Environmental Engineering University of Modena and Reggio Emilia Modena Italy Department of Engineering “Enzo Ferrari” University of Modena and Reggio Emilia Modena Italy Tecnopolo di Mirandola Science and Technology Park for Medicine Mirandola Italy School of High Mechanics and Automotive Design & Technology Department of Mechanical and Civil Engineering University of Modena and Reggio Emilia Modena Italy Department of Surgery Medicine Dentistry and Morphologic Science with Interests in Transplant Oncologic and Regenerative Medicine University of Modena and Reggio Emilia Modena Italy

In a full-arch implant rehabilitation ad modum Branemark, the distribution of stress and strain in mandibular bone is influenced by the type, number and position of implants used. In particular, the biomechanical behaviour of the bone structure after complete osseointegration depends on the load transferred to the bone by each fixture. In this study, a finite-element analysis of two models was performed. Models of an all-on-four configuration and a six-implant configuration were compared in a worst-case scenario. A new V parameter is presented to aid the quantitative and comparative analysis of the all-on-four and six-implant configurations. The influence of orthotropy was also investigated, and a geometric change in the all-on-four configuration is presented.

关键词： Finite-Element Analysis Oral Implants All-on-Four Configuration Six-Implant Configuration Bone Mechanics Comparative Analysis

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Computational Flow Optimization of Heliostat Aspect Ratio for Wind Direction and Elevation Angle

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Energy Procedia 2015年 69卷 148-157页

作者： M.D. Marais K.J. Craig J.P. Meyer Graduate student Department of Mechanical and Aeronautical Engineering University of Pretoria Pretoria 0002 South Africa PrEng PhD Professor Department of Mechanical and Aeronautical Engineering University of Pretoria Pretoria 0002 South Africa PrEng PhD Professor HOD Department of Mechanical and Aeronautical Engineering University of Pretoria Pretoria 0002 South Africa

The choice of heliostat aspect ratio has previously been shown to have an effect on the wind loading coefficients experienced by the structure due to an attacking atmospheric wind. Knowing the wind loads on heliostats is important in order to allow for adequate sizing of all components. The preferred method for determining such loadings is experimental wind tunnel studies, with Computational Fluid Dynamics (CFD) being less popular. A CFD model capable of predicting the mean wind loadings on a heliostat structure subjected to an attacking atmospheric wind and turbulence intensity profile was developed and validated using experimental results available in the open literature. The commercial software package ANSYS Fluent V15.0 was used together with the ANSYS Workbench Design Explorer toolset to study the influence of aspect ratio on the wind loading coefficients.

关键词： heliostat optimization aspect ratio concentrated solar power solar tower wind load computational fluid dynamics

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The Effect of Jet Shape on Jet Injection

The Effect of Jet Shape on Jet Injection

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Geehoon Park Ashin Modak N. Catherine Hogan Ian W. Hunter the Department of Mechanical Engineering Massachusetts Institute of Technology Room 3-147 77 Massachusetts Ave Cambridge MA 02139 USA PhD candidate in the Department of Mechanical Engineering Massachusetts Institute of Technology the BioInstrumentation Lab Massachusetts Institute of Technology Professor of the Department of Mechanical Engineering Massachusetts Institute of Technology

ISBN: (纸本)9781424492695

The effects of the dispersion pattern of a needle-free jet injector are explored. The shape of the jets were compared using a high-speed video camera and jet injections of collimated and dispersed fluid jets with a Lorentz-force actuated jet injector were made into acrylamide gel and post-mortem porcine tissue. A custom-built high-speed X-ray imaging system was used in order to observe the dynamics of the dispersion mechanism for each injection in real time. We show that a collimated jet stream results in greater tissue penetration than a dispersed jet stream.

关键词： Effect Jet Shape Jet Injection

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Influence of the gap size on the wind loading on heliostats

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AIP Conference Proceedings 2016年第1期1734卷

作者： Pierre E. Poulain Ken J. Craig Josua P. Meyer 1PhD student Department of Mechanical and Aeronautical Engineering University of Pretoria Pretoria 0002 South Africa 2PrEng PhD Professor Department of Mechanical and Aeronautical Engineering University of Pretoria Pretoria 0002 South Africa

Generally built in desert areas, heliostat fields undergo various wind loading conditions. An ANSYS Fluent CFD model of an isolated heliostat in worst-case orientation for the drag force is realized via numerical simulations using the realizable k-ε turbulence model. This paper focuses on the gap width between the panels and its influence on the wind loading that heliostats are subjected to. An atmospheric boundary layer profile is generated based on a wind tunnel experiment. For a heliostat in upright and tilted orientations with the wind angle being zero degrees, the gap width is varied and the force and moment coefficients are calculated. In the range tested, all the coefficients globally increase with the widening of the gaps.

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Assessment of the Impact of Window Size, Position and Orientation on Building Energy Load Using BIM

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Procedia engineering 2016年 145卷 1424-1431页

作者： Soojung Kim Puyan A. Zadeh Sheryl Staub-French Thomas Froese Belgin Terim Cavka MASc Candidate Department of Civil Engineering University of British Columbia Vancouver BC V6T 1Z4 Canada Ph.D. Postdoctoral Fellow Department of Civil Engineering University of British Columbia Vancouver V6T 1Z4 Canada Ph.D. Assoc. Prof. Department of Civil Engineering University of British Columbia Vancouver V6T 1Z4 Canada Ph.D. Prof. Department of Civil Engineering University of British Columbia Vancouver V6T 1Z4 Canada Ph.D. Postdoctoral Fellow Department of Mechanical Engineering University of British Columbia Vancouver BC V6T 1Z4 Canada

In improving energy efficiency of buildings, windows play a significant role as they largely influence the energy load. Although there are many studies about the energy efficient window design, a rigorous study is missing which analyzes the mutual impact of windows’ size, position and orientation on the energy load. This study aims to address this gap through a case study on a single family house. For this aim, 65 different design scenarios are created which vary by window size, position and orientation. Building information models (BIMs) are created for each scenario via Autodesk Revit®, and are used for the calculation of the total energy load conducted by Autodesk Green Building Studio®. In the first analysis stage, window-to-wall ratio (WWR) and the windows’ position are studied to assess their effect on the energy load. The preliminary results at this stage indicate that the total energy load increases when the WWR grows, and the windows’ position has the biggest impact on the load when the WWR is 20. Using these results, in the next stage, the position of windows in different orientation is studied to assess how the energy load changes by windows’ position in each orientation. The results show that the building requires the lowest load when the windows are located in the middle height in all orientations, and the east windows’ positioning affects the total energy load the most.

关键词： Building energy load Window design Energy simulation Building information modeling

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Multi-stage and robot assisted incremental sheet metal forming: A review of the state of art and comparison of available technologies 15

Multi-stage and robot assisted incremental sheet metal formi...

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2015 Conference on Advances In Robotics, AIR 2015

作者： Mohanty, Swagatika Regalla, Srinivasa Prakash Daseswara Rao, Y.V. PhD Scholar Department of Mechanical Engineering Birla Institute of Technology and Science Pilani Hyderabad Campus Jawahar Nagar Shamirpet Mandal Ranga Reddy District Hyderabad Telangana State500078 India

ISBN: (纸本)9781450333566

Incremental sheet metal forming is a recently innovated technology of achieving asymmetric sheet metal parts without using a die and through computer numerical control machine tool based path programming by inducing localized plastic deformation with a spherical ended tool. One of the major limitations of the existing method of incremental sheet metal forming is the limiting wall angle, where a wall angle of greater than about 70° is difficult to obtain. The recently proposed solution of multi-stage incremental forming can enable obtaining wall angles close to 90° but it takes longer manufacturing time and may pose problems for materials that severely strain harden. Robot-assisted incremental forming has a potential to offer an alternative solution for steel wall angle limitation but the existing work in the literature on robot-assisted incremental forming mostly focused only on the use of a standalone robotic manipulator instead of the limiting 3-axis CNC vertical machining center or a more expensive 5 or 6-axis vertical machining center. In this paper a review and comparative study of existing multistage incremental forming and robot-assisted incremental forming technologies in solving the limiting wall angle problem is presented. © 2015 ACM.

关键词： Motion planning

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3-D CFD Modeling of a Slanted Receiver in a Compact Linear Fresnel Plant with Etendue-Matched Mirror Field

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Energy Procedia 2015年 69卷 188-197页

作者： A.E. Rungasamy K.J. Craig J.P. Meyer Graduate student PrEng PhD Professor PrEng PhD Professor Head of Department Department of Mechanical and Aeronautical Engineering University of Pretoria Pretoria 0002 South Africa

Compact linear Fresnel receivers can be modified to include an etendue conserving mirror field as opposed to a flat field. Etendue can be used as an indicator of the losses within the system and therefore the optical optimization of the mirror field seeks to conserve incoming etendue. This can be done once for peak conditions and subsequently fixed with mirrors rotating throughout the day; or the mirror axis points can also be allowed to move up and down throughout the day, creating new etendue conservation curves. Radiation is modeled using discrete ordinates with no conduction in a two-dimensional and the absorbed radiation flux profiles are subsequently patched onto a three-dimensional slanted receiver as a heat source. The commercial software package ANSYS Fluent v15.0 was used together with the Matlab toolset to study the influence of different mirror fields on the amount of radiation transferred to the collector pipes.

关键词： etendue matched mirror field discrete ordinates radiation modeling concentrated solar power compact linear fresnel

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Production of Hybrid Composite by a Novel Process and Its Physical Comparison with Single Reinforced Composites

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Materials Today: Proceedings 2015年第4期2卷 2698-2707页

作者： Pardeep Sharma Dinesh Khanduja Satpal Sharma PhD. Research Scholar Mechanical Engineering Department N.I.T Kurukshetra 136118India Professor Mechanical Engineering Department N.I.T Kurukshetra 136118India Assistant Professor Mechanical Engineering DepartmentSchool of Engineering G.B.U Greater Noida 201306 India

The influence of silicon nitride, graphite and ball milled (silicon nitride + graphite) reinforcement on the microstructures and physical properties of Al6082 alloy composites manufactured by conventional stir casting method have been studied. The result showed that the density increased by 2.18%, decreased by 4.1% and increased by 10.33%, whereas porosity increased from 0.37% to 1.43%, from 0.37% to 2.27% and from 0.37% to 1.64% as the weight % of reinforcement particles increased from 0 to 12% in case of silicon nitride, graphite and ball milled (silicon nitride + graphite) reinforced composites respectively.

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