Author : Rugerri Toni Liong
Publisher : KIT Scientific Publishing
Page : 212 pages
File Size : 39,49 MB
Release : 2014-09-03
Category : Technology & Engineering
ISBN : 3866447914
Ein Riss im Rotor ruft eine lokale Steifigkeitsänderung hervor. Die vorliegende Arbeit ermittelt die Steifigkeitsänderung einer angerissenen Welle. Dazu wird ein Kohäsivzonenmodell eingesetzt. Das Modell wurde für die erste Rissöffnungsmode bei ebenem Verzerrungszustand in Abhängigkeit der Mehrachsigkeit des Spannungszustandes (Triaxialität) entwickelt. Außerdemwird das Kohäsivzonenmodell bei einem eindimensionalen Kontinuumsrotor als FE Modell ausgeführt.
Author : Rugerri Toni Liong
Publisher :
Page : 0 pages
File Size : 38,52 MB
Release : 2012
Category : Fracture mechanics
ISBN :
Author : Maier, Daniel
Publisher : KIT Scientific Publishing
Page : 182 pages
File Size : 23,8 MB
Release : 2015-05-12
Category : Technology (General)
ISBN : 3731503697
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 : Leister, Tim
Publisher : KIT Scientific Publishing
Page : 192 pages
File Size : 45,84 MB
Release : 2021-10-28
Category : Technology & Engineering
ISBN : 3731511126
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 : Schmidt, Jan Henrik
Publisher : KIT Scientific Publishing
Page : 164 pages
File Size : 39,7 MB
Release : 2019-01-14
Category : Structural dynamics
ISBN : 3731508729
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.
Author : Buuren, Sietze van
Publisher : KIT Scientific Publishing
Page : 182 pages
File Size : 24,96 MB
Release : 2014-07-30
Category : Technology & Engineering
ISBN : 3731500841
A specific cost-efficient type of plain journal bearing is the porous journal bearing, which possesses a pervious bush that serves as a lubricant reservoir. The current work is concerned with modeling porous journal bearings in multibody systems, for which dynamical models are needed to investigate the bearing's behavior. Such porous journal bearing models as well as models of elementary rotor-bearing systems including these, were developed and investigated during the course for this work.
Author : Burgert, Jens
Publisher : KIT Scientific Publishing
Page : 122 pages
File Size : 10,22 MB
Release : 2021-05-07
Category : Technology & Engineering
ISBN : 3731510871
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 : Klima, Joachim
Publisher : KIT Scientific Publishing
Page : 206 pages
File Size : 31,34 MB
Release : 2018-11-13
Category :
ISBN : 3731508141
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 : Zhang, Xiaoyu
Publisher : KIT Scientific Publishing
Page : 218 pages
File Size : 38,50 MB
Release : 2015-05-13
Category : Technology (General)
ISBN : 373150376X
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 : Kenderi, Gábor
Publisher : KIT Scientific Publishing
Page : 240 pages
File Size : 22,1 MB
Release : 2018-11-11
Category : Identification
ISBN : 3731508346
A nonparametric identification method for highly nonlinear systems is presented that is able to reconstruct the underlying nonlinearities without a priori knowledge of the describing nonlinear functions. The approach is based on nonlinear Kalman Filter algorithms using the well-known state augmentation technique that turns the filter into a dual state and parameter estimator, of which an extension towards nonparametric identification is proposed in the present work.
