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Transducer models in the ultrasound simulation program FIELD II and their accuracy

J. A. Jensen, D. Bk
2010 Journal of the Acoustical Society of America  
coordinate system and utilizes the split-step Fourier technique and a 3-D variant of the Thomson and Chapman wide-angle approximation.  ...  In this paper, the impact of submarine canyons on low-frequency sound propagation is studied using a three dimensional ͑3-D͒ parabolic approximation numerical program, which is implemented in a Cartesian  ...  A finite element method will be used to analyze the vibration transfer paths of an engine and a boundary element method will be used to predict the radiated noise from the rear fender.  ... 
doi:10.1121/1.3384240 fatcat:m5fvh5cecjceneniqfd5w2y3xy

Quantitative assessment of spatial sound distortion by the semi-ideal recording point of a hear-through device

Pablo Hoffmann, Flemming Christensen, Dorte Hammersho/i
2013 Journal of the Acoustical Society of America  
the finite element method.  ...  Numerical simulation of acoustic waves in air and poroelastic media using the partition of unity finite element method.  ...  Geo-acoustic parameter estimation using a multistep inversion technique based on normal mode method.  ... 
doi:10.1121/1.4805375 fatcat:u4bvxh6karet3avpjdhpfwqpf4

Cost Effectiveness of Replacing Sand with Crushed Granite Fine (CGF) In the Mixed Design of Concrete

Muritala Ashola
2013 IOSR Journal of Mechanical and Civil Engineering  
Compressive strength and slump tests were performed on fresh and hardened concrete using two nominal mixes of 1:1:2 and 1:1½: 3 with the sand component being partially replaced with Crushed Granite Fines  ...  Based on the economic analysis of the test results, replacement of sand with 25 -37.5% Crushed Granite Fines is recommended for use in concrete production.  ...  Saad Parvez for critically examining the design and providing various useful suggestions. We are also thankful to Mr. G M Khan for giving us the basic idea of the project and Mr.  ... 
doi:10.9790/1684-1010106 fatcat:boszrubdlzdbflqiucspq5bmwm


2014 Fiabilitate şi Durabilitate  
- in terms of information to come on one hand from the organization's employees and other part of the organization's managers.  ...  Therefore, it is well known be taken into account and apply effective listening in managerial communication, while avoiding - as far as possible, where this process has a maximum yield for the organization  ...  Finite element analysis method allows the study of static and dynamic behavior of the active and actívate elements of rotary and linear ultrasonic motors.  ... 
doaj:f15cf4d2fdcc45a18ae970ddf40df0cb fatcat:ydaxiawy7ve25fcbgjt7ald3de

Hydrogen storage in wind turbine towers

2004 International journal of hydrogen energy  
The gearbox is usually the element of the wind turbine that breaks more easily and needs more maintenance.  ...  trucks.  ... 
doi:10.1016/s0360-3199(04)00003-5 fatcat:ehxsz5uusra6xjotwclpeuznya

Hydrogen storage in wind turbine towers

2004 International journal of hydrogen energy  
The gearbox is usually the element of the wind turbine that breaks more easily and needs more maintenance.  ...  trucks.  ... 
doi:10.1016/j.ijhydene.2003.12.003 fatcat:7xzrdibr2ja6bjdwsch66rmkou

Gemination in Italian: the GEMMA project

Maria‐Gabriella Di Benedetto
2000 Journal of the Acoustical Society of America  
Today, mode-coupling effects are most often addressed using finite-element analysis methods.  ...  The performance of a bulb as a sound barrier was the focus of this study. The vibration response of a bulb seal together with the radiated sound was modeled using a finite element method.  ...  The method is, in fact, analogous to a copy machine. We make the image of sound, instead of duplicating light image, which has to do with a copy machine. The theory ͓Y.-H. Park and S.-H. Kim, J.  ... 
doi:10.1121/1.4743263 fatcat:obqdn75v75agre5yrl3zvndhce

Determination of the One-to-One Correspondence between the Kinematic Screw of the Output Link and the Gradient Screw in a Singular Configuration of a Parallel Mechanism
Определение взаимного соответствия кинематического винта выходного звена и винта-градиента в особом положении механизма параллельной структуры

Е.С. Гебель, В.А. Глазунов
2017 Proceedings of Higher Educational Institutions Маchine Building  
ACKNOWLEDGEMENTS The authors would like to thank the Natural Sciences and Engineering Research Council (NSREC) of Canada for their financial support of this work.  ...  ACKNOWLEDGMENT The authors would like to thank the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canada Research Chair program for their financial support.  ...  The Finite Element Method (FEM) is a computational tool most often used to calculate bending stress, strain and deformation [6] .  ... 
doi:10.18698/0536-1044-2017-7-3-9 fatcat:5xx3qrdmqjfr7ng5oecrdzeb34

Avian interactions with renewable energy infrastructure: An update

Jennifer A. Smith, James F. Dwyer
2016 The Condor  
Increased understanding of aeroelastic loads and the ability to incorporate this knowledge into finite element models and structural dynamics codes make the machines of today more robust but also more  ...  Many current megawatt-scale turbines use a three-stage gearbox consisting of varying arrangements of planetary gears and parallel shafts.  ...  Nacelle: The cover for the gearbox, drivetrain, and generator of a wind turbine.  ... 
doi:10.1650/condor-15-61.1 fatcat:ebkw7qhbrjgktavaqzhxdwxq3m

Motion Systems [chapter]

2009 Principles of Flight Simulation  
There may be a dearth of data for ground handling situations (e.g. a tyre burst) and consequently, elements of the dynamic model may be derived from computed estimates or pilot experience of similar events  ...  This approximation is the basis of the multi-step integration methods used in numerical analysis.  ...  There are several useful observations of the outcome of this programme that apply to most motion systems: • The model of the human vestibular system may not be accurate; • There is a wide variation in  ... 
doi:10.1002/9780470685662.ch10 fatcat:4w57z4rbojbavjc42xzsj45o4q


Kifilideen Lekan Osanyinpeju
2022 Zenodo  
Matrix was used in this study to arrange the terms of the series of the negative power of the Kifilideen trinomial theorem.  ...  The Kifilideen general term formula to determine the term of a given power combination was also originated.  ...  ACKNOWLEDGMENTS ''The Authors'' will like to acknowledge and appreciate members and staff of Structures and Concrete Laboratory of the Department of Civil Engineering, Ahmadu Bello University, Zaria for  ... 
doi:10.5281/zenodo.6409368 fatcat:h2mofg25dna6lavjhupclnkhxq

System Level Monitoring for Time-Varying Conditions with Application to Ground Engaging Equipment

Nima Yousefi
Shovels and wind turbines are primary examples of systems exposed to such conditions.  ...  These external changes, similar to the internal ones, trigger a nonstationary operating envelope, and therefore need to be monitored at a system level.  ...  Shovels can be represented as a multi-body mechanism consisting of a series of connected elements, and actuators at each joint [Koivo et al., 1996] .  ... 
doi:10.7939/r3j67949d fatcat:dklrfolkefggpgsmgw2cuykqku

Fundamentals and advances in magnesium alloy corrosion

M. Esmaily, J.E. Svensson, S. Fajardo, N. Birbilis, G.S. Frankel, S. Virtanen, R. Arrabal, S. Thomas, L.G. Johansson
2017 Progress in Materials Science  
In spite of the greatest historical Mg usage at present, the wider use of Mg alloys remains restricted by a number of inherent limitations, including vulnerability to corrosion, poor formability and low  ...  This review covers recent research that has led to advances in Mg-alloy corrosion; including the application of contemporary methods for understanding Mg corrosion, the establishment of an electrochemical  ...  Thus, in today's automobiles, many components, such as the crank case, camshaft sprocket, gearbox housing, several covers, and the arm of the electric generator, can be replaced with light alloys to meet  ... 
doi:10.1016/j.pmatsci.2017.04.011 fatcat:blgbznb675ewbeluzhm4soomem

The transient behavior of the co-axial non-synchronous rotating assembly of a decanting centrifuge [article]

Brian Donohue, University Of Canterbury
This study was undertaken to understand the dynamics of decanting type centrifuges and develop a methodology for identifying their critical speeds and cause of unstable vibration.  ...  As part of the study, the main rolling element bearings were replaced by oil-film journal bearings to assess the viability of their use.  ...  The popular methods using discretized elements of the rotating system are the transfer matrix method and the finite element method.  ... 
doi:10.26021/3151 fatcat:vn3zh2wzazhddiqlgn5n5rtdrq

Automatic Generation of Assembly Sequence for the Planning of Outfitting Processes in Shipbuilding

Yan Wei
2012 Journal of Ship Production and Design  
Acknowledgments This thesis had been made possible by Delft University of Technology (TUD), China Scholarship Council and IHC Merwede.  ...  the fatigue life of the seam welds joining the vehicle components and body structure (Hung, 2002) .  ...  Some application examples are also included, which shed further light on the nature of outfitting processes and the potential use and current limitations of the method.  ... 
doi:10.5957/jspd.28.2.120002 fatcat:akvvjtxdxfdxtgj3rowoefdrry
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