Experimental and finite element analysis of vibrations of a rotating annular plates

Abstract

Abstract-The aim of this study is to investigate the small amplitude transverse vibration characteristics of an annular thin plate (disk) which rotates about its axis with the rotational speed. The disk is clamped at the inner circumference and free at the outer circumference. This study contains two sections, irst one is the experimental investigation of the transverse dynamical behavior of the disk at various rotational speeds, the second section includes modelling the disk numerically using Finite Element Method (FEM). For the experimental part of the study, a Hard Disk Drive (HDD) is used. The disk is rotated with various rotational speeds and measurements are made using non-contacting systems for each rotational speed value. For the numerical part, a inite element model is built and the natural frequencies with the related mode shapes are obtained. The natural frequencies are plotted for various rotational speeds. Using the data obtained from the results of the study Campbell diagrams are drawn. In order to validate the results of this study, the numerical and experimental results are compared to each other and also to the literature.

Comparison of Fatigue Analysis Results in the Frequency Domain using PSD data and specific load

“…Theoretical background to ind equivalent fatigue load in the time domain and frequency domain was described, and fatigue loads were obtained by applying uniaxial and multiaxial loads to the cantilever beams [3]. Various fatigue damage models ap-plied to fatigue damage analysis of a broadband response spectrum were introduced, and numerical comparative studies for selecting fatigue damage models suitable for riser fatigue analysis were conducted [4,5] Eight types of PSD analysis methods were introduced, and their accuracies and errors were analyzed [6,7]. Four types of PSD analysis methods used for the frequency domain fatigue analysis were compared, and the fatigue life of the aircraft was predicted using Dirlik and Benasciutti-Tovo methods [8] Time domain and frequency domain fatigue analysis were performed for a F-5 plane and compared [9].…”