On The Use Of Model Order Reduction Techniques For The Elastohydrodynamic Contact Problem

Author : Maier, Daniel
Publisher : KIT Scientific Publishing
Page : 182 pages
File Size : 51,6 Mb
Release : 2015-05-12
Category : Technology (General)
ISBN : 9783731503699

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On the Use of Model Order Reduction Techniques for the Elastohydrodynamic Contact Problem by Maier, Daniel Pdf

The objective of this work is to develop a method which solves the nonlinear elastohydrodynamic contact problem in a fast and precise way using model order reduction techniques. The reduction procedure is based on a projection onto a low-dimensional subspace using different hyper-reduction procedures. The method provides fast and highly accurate reduced order models for stationary and transient, Newtonian and Non-Newtonian EHD line and point contact problems.

Author : Daniel Maier
Publisher : Unknown
Page : 170 pages
File Size : 54,7 Mb
Release : 2020-10-09
Category : Technology & Engineering
ISBN : 1013280636

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On the Use of Model Order Reduction Techniques for the Elastohydrodynamic Contact Problem by Daniel Maier Pdf

The objective of this work is to develop a method which solves the nonlinear elastohydrodynamic contact problem in a fast and precise way using model order reduction techniques. The reduction procedure is based on a projection onto a low-dimensional subspace using different hyper-reduction procedures. The method provides fast and highly accurate reduced order models for stationary and transient, Newtonian and Non-Newtonian EHD line and point contact problems. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.

Author : Wassim Habchi
Publisher : John Wiley & Sons
Page : 464 pages
File Size : 45,7 Mb
Release : 2018-07-23
Category : Technology & Engineering
ISBN : 9781119225126

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Finite Element Modeling of Elastohydrodynamic Lubrication Problems by Wassim Habchi Pdf

Covers the latest developments in modeling elastohydrodynamic lubrication (EHL) problems using the finite element method (FEM) This comprehensive guide introduces readers to a powerful technology being used today in the modeling of elastohydrodynamic lubrication (EHL) problems. It provides a general framework based on the finite element method (FEM) for dealing with multi-physical problems of complex nature (such as the EHL problem) and is accompanied by a website hosting a user-friendly FEM software for the treatment of EHL problems, based on the methodology described in the book. Finite Element Modeling of Elastohydrodynamic Lubrication Problems begins with an introduction to both the EHL and FEM fields. It then covers Standard FEM modeling of EHL problems, before going over more advanced techniques that employ model order reduction to allow significant savings in computational overhead. Finally, the book looks at applications that show how the developed modeling framework could be used to accurately predict the performance of EHL contacts in terms of lubricant film thickness, pressure build-up and friction coefficients under different configurations. Finite Element Modeling of Elastohydrodynamic Lubrication Problems offers in-depth chapter coverage of Elastohydrodynamic Lubrication and its FEM Modeling, under Isothermal Newtonian and Generalized-Newtonian conditions with the inclusion of Thermal Effects; Standard FEM Modeling; Advanced FEM Modeling, including Model Order Reduction techniques; and Applications, including Pressure, Film Thickness and Friction Predictions, and Coated EHL. This book: Comprehensively covers the latest technology in modeling EHL problems Focuses on the FEM modeling of EHL problems Incorporates advanced techniques based on model order reduction Covers applications of the method to complex EHL problems Accompanied by a website hosting a user-friendly FEM-based EHL software Finite Element Modeling of Elastohydrodynamic Lubrication Problems is an ideal book for researchers and graduate students in the field of Tribology.

Author : Schmidt, Jan Henrik
Publisher : KIT Scientific Publishing
Page : 165 pages
File Size : 47,8 Mb
Release : 2019-01-14
Category : Electronic
ISBN : 9783731508724

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An efficient solution procedure for elastohydrodynamic contact problems considering structural dynamics by Schmidt, Jan Henrik Pdf

Author : Burgert, Jens
Publisher : KIT Scientific Publishing
Page : 122 pages
File Size : 43,8 Mb
Release : 2021-05-07
Category : Technology & Engineering
ISBN : 9783731510871

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On direct and inverse problems related to longitudinal impact of non-uniform elastic rods by Burgert, Jens Pdf

The impact of two non-uniform elastic rods is considered and a recursive method was developed that solves the inverse problem: Find the location-dependent impedance function of the impacting rod that generates a prescribed impact force. The developed method delivers exact solutions in closed-form. Moreover, a condition is derived which states if a physically meaningful solution exists. Finally, the underlying 1D model has been validated experimentally.

Author : Aramendiz Fuentes, Jimmy Alberto
Publisher : KIT Scientific Publishing
Page : 180 pages
File Size : 42,9 Mb
Release : 2023-09-12
Category : Electronic
ISBN : 9783731512677

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On the Influence of Piecewise Defined Contact Geometries on Friction Dampers by Aramendiz Fuentes, Jimmy Alberto Pdf

This work considers dampers that do not solely focus on a single strategy but instead combine them. The capabilities of conventional dry friction dampers are expanded by taking into account piecewise defined contact geometries. This leads to friction dampers that change their behavior depending on the amplitude of the oscillations. The vibration damping device in this work, introduces damping at high oscillation amplitudes and takes advantage of absorption at low oscillation amplitudes.

Author : Kenderi, Gábor
Publisher : KIT Scientific Publishing
Page : 241 pages
File Size : 47,7 Mb
Release : 2018-11-11
Category : Electronic
ISBN : 9783731508342

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Nonparametric identification of nonlinear dynamic systems by Kenderi, Gábor Pdf

Author : Klima, Joachim
Publisher : KIT Scientific Publishing
Page : 206 pages
File Size : 51,7 Mb
Release : 2018-11-13
Category : Electronic
ISBN : 9783731508144

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Lubricant transport towards tribocontact in capillary surface structures by Klima, Joachim Pdf

To counter lubricant shortage at a frictional contact (starvation), lubrication liquids, e.g. oils, are actively transported from a distant location towards the undersupplied tribocontact. This is done via small channels or generally via structures cut into a flat surface. In this way one can use capillary force as a cheap and reliable driver of the lubricant flow. Numerical modeling and experiments show that this method can be considered a promising new option to enhance tribocontact operation.

Author : Leister, Tim
Publisher : KIT Scientific Publishing
Page : 192 pages
File Size : 44,7 Mb
Release : 2021-10-28
Category : Technology & Engineering
ISBN : 9783731511120

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Dynamics of Rotors on Refrigerant-Lubricated Gas Foil Bearings by Leister, Tim Pdf

The gas foil bearing (GFB) technology is a key factor for the transition to oil-free rotating machinery. Among numerous advantages, GFBs offer the unique ability to be lubricated with working fluids such as refrigerants. However, the computational analysis of refrigerant-lubricated GFB–rotor systems represents an interdisciplinary problem of enormous complexity. This work pushes forward existing limits of feasibility and establishes a new strategy that enables stability and bifurcation analyses.

Author : Jan Henrik Schmidt
Publisher : Unknown
Page : 154 pages
File Size : 46,8 Mb
Release : 2020-10-09
Category : Technology & Engineering
ISBN : 1013278798

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An Efficient Solution Procedure for Elastohydrodynamic Contact Problems Considering Structural Dynamics by Jan Henrik Schmidt Pdf

This work presents an efficient solution procedure for the elastohydrodynamic (EHD) contact problem considering structural dynamics. The contact bodies are modeled using reduced finite element models. Singly diagonal implicit Runge-Kutta (SDIRK) methods are used for adaptive time integration. The structural model is coupled with the nonlinear Reynolds Equation using a monolithic coupling approach. Finally, a reduced order model of the complete nonlinear coupled problem is constructed. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.

Author : Marco Paggi,David Hills
Publisher : Springer
Page : 330 pages
File Size : 50,7 Mb
Release : 2019-06-26
Category : Technology & Engineering
ISBN : 9783030203771

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Modeling and Simulation of Tribological Problems in Technology by Marco Paggi,David Hills Pdf

This book conveys, in a self-contained manner, the fundamental concepts for classifying types of contact, the essential mathematical methods for the formulation of contact problems, and the numerical methods required for their solution. In addition to the methodologies, it covers a broad range of applications, including contact problems in mechanical engineering, microelectronics and nanomechanics. All chapters provide both substantial background on the theory and numerical methods, and in-depth treatments of cutting-edge research topics and applications. The book is primarily intended for doctoral students of applied mathematics, mechanics, engineering and physics with a strong interest in the theoretical modelling, numerical simulation and experimental characterization of contact problems in technology. It will also benefit researchers in the above mentioned and neighbouring fields working in academia or at private research and development centres who are interested in a concise yet comprehensive overview of contact mechanics, from its fundamental mathematical background, to the computational methods and the experimental techniques currently available for the solution of contact problems.

Author : Matthew R.W. Brake,Ludovic Renson,Robert J. Kuether,Paolo Tiso
Publisher : Springer Nature
Page : 291 pages
File Size : 51,8 Mb
Release : 2022-07-28
Category : Technology & Engineering
ISBN : 9783031040863

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Nonlinear Structures & Systems, Volume 1 by Matthew R.W. Brake,Ludovic Renson,Robert J. Kuether,Paolo Tiso Pdf

Nonlinear Structures & Systems, Volume 1: Proceedings of the 40th IMAC, A Conference and Exposition on Structural Dynamics, 2022, the first volume of nine from the Conference brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Nonlinear Dynamics, including papers on: Experimental Nonlinear Dynamics Jointed Structures: Identification, Mechanics, Dynamics Nonlinear Damping Nonlinear Modeling and Simulation Nonlinear Reduced-Order Modeling Nonlinearity and System Identification

Author : D. Dowson,G. R. Higginson
Publisher : Elsevier
Page : 254 pages
File Size : 49,8 Mb
Release : 2014-07-18
Category : Technology & Engineering
ISBN : 9781483181899

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Elasto-Hydrodynamic Lubrication by D. Dowson,G. R. Higginson Pdf

Elasto-Hydrodynamic Lubrication deals with the mechanism of elasto-hydrodynamic lubrication, that is, the lubrication regime in operation over the small areas where machine components are in nominal point or line contact. The lubrication of rigid contacts is discussed, along with the effects of high pressure on the lubricant and bounding solids. The governing equations for the solution of elasto-hydrodynamic problems are presented. Comprised of 13 chapters, this volume begins with an overview of elasto-hydrodynamic lubrication and representation of contacts by cylinders, followed by a discussion on equations relevant to lubrication, including the Reynolds equation. The reader is then introduced to lubrication of rigid cylinders; the importance of film thickness in highly loaded rigid contacts; the elasticity of solids in contact; and the theory of elasto-hydrodynamic lubrication. Subsequent chapters focus on apparatus and measurements of film thickness and film shape; friction and viscosity; and lubrication of gears and roller bearings. This book will be of interest to tribologists.

Author : Zhang, Xiaoyu
Publisher : KIT Scientific Publishing
Page : 218 pages
File Size : 44,8 Mb
Release : 2015-05-13
Category : Technology (General)
ISBN : 9783731503767

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Crosswind stability of vehicles under nonstationary wind excitation by Zhang, Xiaoyu Pdf

This work has studied the crosswind stability of vehicles under nonstationary wind excitation in various scenarios. Railway vehicles running on curved and straight track with varying vehicle speed are studied. Road vehicles are classified into different categories. For each vehicle class, a corresponding worst-case vehicle model has been built. As the wind excitation on the vehicle is a stochastic process, a risk analysis has to be carried out and failure probabilities are computed and analyzed.

Author : Walter Sextro
Publisher : Springer Science & Business Media
Page : 163 pages
File Size : 51,5 Mb
Release : 2013-11-11
Category : Science
ISBN : 9783540468714

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Dynamical Contact Problems with Friction by Walter Sextro Pdf

The aim of this book is to describe an efficient procedure to model dynamical contact problems with friction. This procedure is applied to different practical problems and validated by experiments. Friction contacts are used to transmit forces or to dissipate energy. Examples for dynamical engineering systems with friction are brakes, machine tools, motors, turbines, bearings or wheel-rail systems. A better understanding of friction phenomena can result in improvements like the reduction of noise and maintenance costs, increased life time of machines and improved energy efficiency. Dependent on the features of the friction contact, different contact models and solution methods are applied.