ESTIMATION OF WEAR IN DRY FRICTION DAMPERS AND ITS EFFECT ON VIBRATION REDUCTION

Download

Thesis_Aykut_Cardak.pdf

Date

2022-8-31

Author

Çardak, Aykut

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

205
views

16
downloads

Although friction is mostly considered an undesirable phenomenon due to its energy dissipation characteristic, specially designed dry friction dampers utilize this feature to reduce the dynamic response of the system at the resonant frequencies. However, fretting wear due to dry friction during the operational life of the structure may drastically shift the performance from the initial design point and eventually cause drastic failures. Hence, it is important to establish a sophisticated algorithm that couples nonlinear dynamic response solver of frictionally constraint problems with a fretting wear model. In this thesis, the proposed methodology is utilized to find the evolution of dynamic response and surface topography of two widely used case studies which are shrouded blade and grounded blade platforms under ongoing vibration cycles.

Subject Keywords

Nonlinear Vibration, Harmonic Balance Method, Dry Friction Damping, Fretting Wear

URI

https://hdl.handle.net/11511/99671

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Vibration reduction by using two tuned mass dampers with dry friction damping Doğan, Muhammed Emin; Ciğeroğlu, Ender (null; 2019-02-20) Vibration reduction of a single-degree-of-freedom system connected to two tuned mass dampers (TMDs) equipped with dry friction dampers is considered in this work. The system is subjected to sinusoidal base excitation. Parameters of TMDs are optimized to minimize the peak values of the response of the primary system. Harmonic balance method (HBM) is used to obtain the steady state solution of the three-degrees-of-freedom nonlinear system in frequency domain. Newton’s method with arc length continuation is ut...
Nonlinear 3D Modeling and Vibration Analysis of Horizontal Drum Type Washing Machines Baykal, Cem; Ciğeroğlu, Ender; Yazıcıoğlu, Yiğit (2020-01-01) In this study, a nonlinear 3-D mathematical model for horizontal drum type washing machines is developed considering rotating unbalance type excitation. Nonlinear differential equations of motion are converted into a set of nonlinear algebraic equations by using Harmonic Balance Method (HBM). The resulting nonlinear algebraic equations are solved by using Newton’s method with arc-length continuation. Several case studies are performed in order to observe the effects of orientation angles of springs and damp...
Vibration analysis of washing machines in the drum plane Baykal, Cem; Ciğeroğlu, Ender; Yazıcıoğlu, Yiğit (Springer, Cham; 2019-02-20) In this study, a nonlinear mathematical model for drum-type washing machines is developed considering rotating unbalance type excitation. Nonlinear differential equations of motion are converted into a set of nonlinear algebraic equations by using harmonic balance method (HBM). The resulting nonlinear algebraic equations are solved by using Newton’s method with arc-length continuation. Several case studies are performed in order to observe the effects of orientation angles of springs and dampers supporting ...
A new jacobian matrix calculation method to decrease computational time in periodic force response analysis of nonlinear structures Kızılay, Hazım Sef; Ciğeroğlu, Ender; Department of Mechanical Engineering (2019) The contact interfaces between the components used in high speed systems such as the turbo machinery cause nonlinear vibrations. In order to understand the dynamic characteristic of nonlinear systems, it is important to perform nonlinear vibration analysis. In nonlinear vibration analysis, due to the properties of nonlinear elements used, it is not possible to calculate the Jacobian matrix analytically or it becomes very complicated and difficult, therefore, Jacobian matrix is calculated as numerically. In ...
Adaptive Harmonic Balance Methods, A Comparison Sert, Onur; Ciğeroğlu, Ender (2016-01-28) Harmonic balance method (HBM) is one of the most popular and powerful methods, which is used to obtain response of nonlinear vibratory systems in frequency domain. The main idea of the method is to express the response of the system in Fourier series and converting the nonlinear differential equations of motion into a set of nonlinear algebraic equations. System response can be obtained by solving this nonlinear equation set in terms of the unknown Fourier coefficients. The accuracy of the solution is great...

Citation Formats

A. Çardak, “ESTIMATION OF WEAR IN DRY FRICTION DAMPERS AND ITS EFFECT ON VIBRATION REDUCTION,” M.S. - Master of Science, Middle East Technical University, 2022.