Crosswind stability of vehicles under nonstationary wind excitation
Crosswind stability of vehicles under nonstationary wind excitation

Author: Zhang, Xiaoyu

Publisher: KIT Scientific Publishing

Published: 2015-05-13

Total Pages: 218

ISBN-13: 373150376X

DOWNLOAD EBOOK

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.

On direct and inverse problems related to longitudinal impact of non-uniform elastic rods
On direct and inverse problems related to longitudinal impact of non-uniform elastic rods

Author: Burgert, Jens

Publisher: KIT Scientific Publishing

Published: 2021-05-07

Total Pages: 122

ISBN-13: 3731510871

DOWNLOAD EBOOK

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.

Lubricant transport towards tribocontact in capillary surface structures
Lubricant transport towards tribocontact in capillary surface structures

Author: Klima, Joachim

Publisher: KIT Scientific Publishing

Published: 2018-11-13

Total Pages: 206

ISBN-13: 3731508141

DOWNLOAD EBOOK

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.

An efficient solution procedure for elastohydrodynamic contact problems considering structural dynamics
An efficient solution procedure for elastohydrodynamic contact problems considering structural dynamics

Author: Schmidt, Jan Henrik

Publisher: KIT Scientific Publishing

Published: 2019-01-14

Total Pages: 164

ISBN-13: 3731508729

DOWNLOAD EBOOK

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.

Nonparametric identification of nonlinear dynamic systems
Nonparametric identification of nonlinear dynamic systems

Author: Kenderi, Gábor

Publisher: KIT Scientific Publishing

Published: 2018-11-11

Total Pages: 240

ISBN-13: 3731508346

DOWNLOAD EBOOK

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.

Dynamics of Rotors on Refrigerant-Lubricated Gas Foil Bearings
Dynamics of Rotors on Refrigerant-Lubricated Gas Foil Bearings

Author: Leister, Tim

Publisher: KIT Scientific Publishing

Published: 2021-10-28

Total Pages: 192

ISBN-13: 3731511126

DOWNLOAD EBOOK

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.

On the Influence of Piecewise Defined Contact Geometries on Friction Dampers
On the Influence of Piecewise Defined Contact Geometries on Friction Dampers

Author: Aramendiz Fuentes, Jimmy Alberto

Publisher: KIT Scientific Publishing

Published: 2023-09-12

Total Pages: 180

ISBN-13: 373151267X

DOWNLOAD EBOOK

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.

Microbial Mitigation of Stress Response of Food Legumes
Microbial Mitigation of Stress Response of Food Legumes

Author: N. Amaresan

Publisher: CRC Press

Published: 2020-03-31

Total Pages: 0

ISBN-13: 9781000047004

DOWNLOAD EBOOK

Microbial Mitigation of Stress Responses of Food Legumes provides knowledge on the impact of abiotic and biotic stress on the agriculture of grain legumes especially pulses and it critically reviews the cutting-edge research in exploring plant microbe interactions to mitigate the stress. It helps in understanding the fundamentals of microbial-mediated management of abiotic and biotic stress in grain legumes. Salient features:  Describes the usefulness of microbiome of plant/insects for enhancing the production of grain legumes  Focuses on recent advances in microbial methods for mitigating the stress and their application in sustainability of legume production  Provides a unique collection of microbial data for the improvement of legume productivity  Details microbial metabolites at the gene and molecule levels for plant stress management The reader will get all essential and updated information on various stress factors, crop responses, and microbial-mediated stress management for better food legume production.