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Shape Optimization of a Labyrinth Seal Applying the Simulated Annealing Method

V. Schramm, J. Denecke, S. Kim, S. Wittig
2004 International Journal of Rotating Machinery  
The characteristics of the flow fields of selected seal configurations are compared and discussed against the background of the leakage behavior of the seal.  ...  A program for a parameterized, automated grid generation is coupled with a commercial Computational Fluid Dynamics (CFD) flow solver and an optimization algorithm.  ...  The geometry of this seal is the same seal as presented in Schramm et al. (2000) therefore experimental values were available to evaluate the precision of the leakage predictions.  ... 
doi:10.1155/s1023621x04000375 fatcat:plkefpmj6rddbhkov3i2v6ps3i

About the Influence of Eco-Friendly Fluids on the Performance of an External Gear Pump

Gabriele Muzzioli, Luca Montorsi, Andrea Polito, Andrea Lucchi, Alessandro Sassi, Massimo Milani
2021 Energies  
A computational fluid dynamics (CFD) approach based on the overset mesh technique was developed for the simulation of the full 3D geometry of an industrial pump, including all the characteristic leakages  ...  A sensibility analysis of the numerical model with respect to different fluid properties was performed on a commonly used mineral oil, showing the key role of the fluid compressibility on the prediction  ...  Finally, a sincere acknowledgement goes to the research team and to the partners of the project "Efflics-Eco Friendly Fluidics for Fluid Power" for the key support in this work's development.  ... 
doi:10.3390/en14040799 fatcat:ml2h5piwsjgm3cwrvjq5m2v3im

Characterization of an exchange-based two-qubit gate for resonant exchange qubits

Matthew P. Wardrop, Andrew C. Doherty
2016 Physical review B  
This approach uses energy gaps to suppress leakage rather than conventional pulse sequences.  ...  As such, exchange-coupled resonant exchange qubits remain an attractive approach for quantum computing.  ...  Research was supported by the Office of the Director of National Intelligence, Intelligence Advanced Research Projects Activity (IARPA), through the Army Research Office grant W911NF-12-1-0354 and by the  ... 
doi:10.1103/physrevb.93.075436 fatcat:vyl26zvuqbdszmzw5xbz6odcau

Novel Actuation Methods for High Force Haptics [chapter]

Stephen P., Neville Hog
2010 Advances in Haptics  
Calculations based on this particular model are summarized below to illustrate the relationship between transmission geometry and system performance.  ...  Changes to system geometry improve certain aspects of performance at the expense of others.  ... 
doi:10.5772/8702 fatcat:s5judyqdj5ci7mwwccxv7ajmni

Modification of electron-phonon coupling by micromachining and suspension [article]

Olli-Pentti Saira, Matthew H. Matheny, Libin Wang, Jukka Pekola, Michael Roukes
2019 arXiv   pre-print
Standard power laws, describing the heat flow in the majority of experiments, have been identified and derived theoretically.  ...  Weak electron-phonon interaction in metals at low temperatures forms the basis of operation for cryogenic hot-electron bolometers and calorimeters.  ...  We realize a similar non-suspended device geometry with heater and thermometer connections [ Fig. 3(a) , only one half of the device was tested].  ... 
arXiv:1910.10126v1 fatcat:tnxheba23ba63dtbvzzscxxpai

A Polarization Sensitive Bolometric Detector for Observations of the Cosmic Microwave Background [article]

W.C. Jones, R.S. Bhatia, J.J. Bock, A.E. Lange
2002 arXiv   pre-print
Numerical modelling of the structures has been used to optimize the bolometer geometry and coupling to optics. Comparisons of numerical results and experimental data are made.  ...  Devices using NTD Ge thermistors have achieved NEPs of 2 x 10^-17 W/sqrtHz with a 1/f knee below 100 mHz at a base temperature of 270 mK.  ...  Tom Montroy and Ted Kisner provided invaluable information about the performance of the PSBs installed in the Boomerang focal plane, and Eric Torbet has measured the polarized spectra of the PSBs integrated  ... 
arXiv:astro-ph/0209132v1 fatcat:z6jynrpl3bg25lzgajer3x5bqq

Turbomachinery simulation challenges and the future

James Tyacke, N.R. Vadlamani, W. Trojak, R. Watson, Y. Ma, P.G. Tucker
2019 Progress in Aerospace Sciences  
This will bring about changes in the role and design of aero-engines, requiring a greater degree of high fidelity, coupled modelling.  ...  These include use of higher order schemes, internal and external zonalisation and coupling, exploitation of hardware and pre and post-processing.  ...  Subsequent processing of lower order meshes may offer a non-ideal answer. One could mesh a compatible FV mesh and morph this to high order geometry, requiring only one extra pre-processing step.  ... 
doi:10.1016/j.paerosci.2019.100554 fatcat:zwnbebr7nvde7apzzvk47jsc3m

Voltage controlled sub-THz detection with gated planar asymmetric nanochannels

H. Sánchez-Martín, J. Mateos, J. A. Novoa, J. A. Delgado-Notario, Y. M. Meziani, S. Pérez, H. Theveneau, G. Ducournau, C. Gaquière, T. González, I. Íñiguez-de-la-Torre
2018 Applied Physics Letters  
A simple quasi-static model based on the DC measurements of the current-voltage curves is able to predict the role of the gate bias in its performance.  ...  interest in security, medical imaging, and high speed short range communications, among other fields. 1 A non-classic architecture based on a single nanolithography step allowing to define an asymmetric  ...  A simple quasi-static model based on the DC measurements of the current-voltage curves is able to predict the role of the gate bias in its performance.  ... 
doi:10.1063/1.5041507 fatcat:pr6jaec43nenhgsahu3ifrvkra

Study of mechanical aspects of leak tightness in a pressure relief valve using advanced FE-analysis

Yevgen Gorash, William Dempster, William D. Nicholls, Robert Hamilton, Ali A. Anwar
2016 Journal of Loss Prevention in the Process Industries  
The valve geometry is simplified to an axisymmetric problem, which comprises a simple geometry consisting of only 3 components.  ...  All the components are made of AISI type 316N(L) steel defined using the multilinear kinematic hardening model based on monotonic and cyclic tests at 20 • C.  ...  The Strathprints institutional repository (http://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs.  ... 
doi:10.1016/j.jlp.2016.04.009 fatcat:qvpgmwg6bvavxcrqhhji2sd7qq

Lubricated Loaded Tooth Contact Analysis and Non-Newtonian Thermoelastohydrodynamics of High-Performance Spur Gear Transmission Systems

Gajarajan Sivayogan, Ramin Rahmani, Homer Rahnejat
2020 Lubricants  
This comprehensive approach based on established TEHL analysis, particularly including the effect of LLTCA on the TEHL of spur gears, has not hitherto been reported in literature.  ...  Energy efficiency and functional reliability are the two key requirements in the design of high-performance transmissions.  ...  Furthermore, the study prompts future investigations into a detailed analysis of gear efficiency and overall performance, based on the LLTCA approach reported here.  ... 
doi:10.3390/lubricants8020020 fatcat:4mldqwkugbaetfik7loxxqshxe

A Review of Gerotor Technology in Hydraulic Machines

Pedro Javier Gamez-Montero, Esteve Codina, Robert Castilla
2019 Energies  
From the historical background, this literature review reports the current approaches in gerotor pumps (geometry and performance approaches, modeling and numerical simulations), orbital motors and new  ...  The report gives a catalogue of guidelines based on the trochoidal-envelope definition, a background analysis, the worldwide distribution of articles in each continent and country and the most frequently  ...  An evolution to simplicity presented by Pellegri and Vacca [120] was the coupled lumped-parameter 2D CFD approach just requiring CAD drawings and a new submodule of lateral leakage.  ... 
doi:10.3390/en12122423 fatcat:j4l3iyywbzhcpnawcjl42246om

Precision medicine in human heart modeling : Perspectives, challenges, and opportunities

M Peirlinck, F Sahli Costabal, J Yao, J M Guccione, S Tripathy, Y Wang, D Ozturk, P Segars, T M Morrison, S Levine, E Kuhl
2021 Biomechanics and Modeling in Mechanobiology  
In cardiovascular health, precision medicine has emerged as a promising paradigm to enable cost-effective solutions that improve quality of life and reduce mortality rates.  ...  Precision medicine is a new frontier in healthcare that uses scientific methods to customize medical treatment to the individual genes, anatomy, physiology, and lifestyle of each person.  ...  Magnetic Resonance of the Millennium Science Initiative to FSC, the NIH grant R01 HL131753 to PS, the NIH grant U01 HL119578 to JMG and EK, and a Stanford Bio-X IIP seed grant to EK.  ... 
doi:10.1007/s10237-021-01421-z pmid:33580313 pmcid:PMC8154814 fatcat:yt4jb7s445fdri6l4r65o47tba

Effect of Edge Roughness on Static Characteristics of Graphene Nanoribbon Field Effect Transistor

Yaser Banadaki, Ashok Srivastava
2016 Electronics  
In this paper, we present a physics-based analytical model of GNR FET, which allows for the evaluation of GNR FET performance including the effects of line-edge roughness as its practical specific non-ideality  ...  Also, the effect of rough edges on decreasing on-current was modeled by a fitting equation regardless of the physical scattering mechanisms in a GNR channel.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/electronics5010011 fatcat:lpriyf7f5zhdtgeo4jjewtdb4a

An Intelligent Predictive Model-Based Multi-Response Optimization of EDM Process

N. Ganesh, R. K. Ghadai, A. K. Bhoi, K. Kalita, Xiao-Zhi Gao
2020 CMES - Computer Modeling in Engineering & Sciences  
It does not require a cutting tool and can machine complex geometries easily. However, it suffers from drawbacks like a poor rate of machining and excessive tool wear.  ...  The predictive models, which are based on the symbolic regression approach exploit the machine intelligence of Genetic Programming (GP).  ...  ANOVA is then performed to identify and eliminate the non-significant terms of the fitted RSM model [24, 25] .  ... 
doi:10.32604/cmes.2020.09645 fatcat:xz226muohvgwtg2mtdo4p5hffe

Prediction of Charge-Discharge and Impedance Characteristics of Electric Double-Layer Capacitors Using Porous Electrode Theory

Muhammad R. Hasyim, Danhao Ma, Ramakrishnan Rajagopalan, Clive Randall
2017 Journal of the Electrochemical Society  
Two first-principles modeling methods were used to analyze and quantitatively predict performance characteristics of Electric Double-Layer Capacitors (EDLCs), namely Time-Domain Current Method (TDCM) and  ...  materials characteristics and device performance.  ...  The authors would also like to acknowledge the financial support from NSF I/UCRC Center for Dielectrics and Piezoelectrics and ETCE Research Development grant from The Pennsylvania State University.  ... 
doi:10.1149/2.0051713jes fatcat:djy5panbhrgthcltgiepwfj2wq
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