Researches Regarding Modal Analysis of a Pressure Wave Supercharger Rotor

2013 ◽  
Vol 332 ◽  
pp. 319-324
Author(s):  
Catalin George Atanasiu ◽  
Daniel Eugen Buzea
Keyword(s):  
Modal Analysis ◽  
Experimental Analysis ◽  
Pressure Wave ◽  
Experimental Modal Analysis ◽  
Virtual Simulation ◽  
Good Thing

This paper aims on comparison between virtual modal analysis and experimental modal analysis of a PWS rotor. A virtual simulation and an experimental analysis were conducted in order to successfully determine the eigen modes of the PWS rotor. Those frequencies are a good thing to know in case of a new PWS development.

An Experimental Analysis of the Real Dynamic Behavior and the Reliability Verification of an Existing Footbridge

2016 ◽  
Vol 827 ◽  
pp. 308-311
Author(s):  
Eva Fanfulová ◽  
Tomáš Plachy ◽  
Michal Polak
Keyword(s):  
Modal Analysis ◽  
Experimental Analysis ◽  
Experimental Modal Analysis ◽  
Load Test ◽  
Dynamic Experiment ◽  
Natural Vibrations ◽  
Dynamic Load Test ◽  
Dynamic Experiments ◽  
Vertical Accelerations ◽  
Partial Variation

The investigated existing footbridge, on which the dynamic experimental analysis was concentrated, was built across Vltava River in Prague in 1984. Since putting into operation, the footbridge was apparently sensitive to dynamic excitation by passing pedestrians. Above that in the course of its existence the considerable part of the footbridge deck was overflowed by two great floods that happened in August 2002 and in June 2013. After the second flood, a visible damage on the footbridge deck was detected by a visual inspection. The described dynamic experiment was divided into two basic parts. The experimental modal analysis was carried out first and then the dynamic load test was realized. It was focused to the deck vibrations induced by different pedestrians groups. It was found out the footbridge deck vertical accelerations exceed the pedestrian comfort limit in some normal situations. On the basis of comparison between modes of natural vibrations, which were evaluated by the experimental modal analysis and the equivalent ones from previous dynamic experiments, it was validated that the discovered deck damage caused the partial variation of fundamental dynamic footbridge behavior.

Effect of Bass Bar Tension on Modal Parameters of a Violin's Top Plate

2015 ◽  
Vol 39 (1) ◽  
pp. 145-149 ◽  
Author(s):  
Ewa B. Skrodzka ◽  
Bogumił B.J. Linde ◽  
Antoni Krupa
Keyword(s):  
Modal Analysis ◽  
Experimental Modal Analysis ◽  
Mode Shapes ◽  
Modal Parameters ◽  
Normal Value ◽  
Modal Damping

Abstract Experimental modal analysis of a violin with three different tensions of a bass bar has been performed. The bass bar tension is the only intentionally introduced modification of the instrument. The aim of the study was to find differences and similarities between top plate modal parameters determined by a bass bar perfectly fitting the shape of the top plate, the bass bar with a tension usually applied by luthiers (normal), and the tension higher than the normal value. In the modal analysis four signature modes are taken into account. Bass bar tension does not change the sequence of mode shapes. Changes in modal damping are insignificant. An increase in bass bar tension causes an increase in modal frequencies A0 and B(1+) and does not change the frequencies of modes CBR and B(1-).

The Use of Modan 3D in Experimental Modal Analysis

2013 ◽  
Vol 486 ◽  
pp. 36-41 ◽  
Author(s):  
Róbert Huňady ◽  
František Trebuňa ◽  
Martin Hagara ◽  
Martin Schrötter
Keyword(s):  
Modal Analysis ◽  
Vibration Analysis ◽  
High Speed ◽  
Mechanical Vibration ◽  
Steel Sample ◽  
Experimental Modal Analysis ◽  
Image Correlation ◽  
Optical Methods ◽  
Mode Shapes ◽  
Vibration Modes

Experimental modal analysis is a relatively young part of dynamics, which deals with the vibration modes identification of machines or their parts. Its development has started since the beginning of the eighties, when the computers hardware equipment has improved and the fast Fourier transform (FFT) could be used for the results determination. Nowadays it provides an uncountable set of vibration analysis possibilities starting with conventional contact transducers of acceleration and ending with modern noncontact optical methods. In this contribution we mention the use of high-speed digital image correlation by experimental determination of mode shapes and modal frequencies. The aim of our work is to create a program application called Modan 3D enabling the performing of experimental modal analysis and operational modal analysis. In this paper the experimental modal analysis of a thin steel sample performed with Q-450 Dantec Dynamics is described. In Modan 3D the experiment data were processed and the vibration modes were determined. The reached results were verified by PULSE modulus specialized for mechanical vibration analysis.

Comparison of Prestressed Concrete Railway Sleepers and New LCR Concrete Sleepers with Experimental Modal Analysis

2021 ◽  
pp. 105821
Author(s):  
Bekir AKTAŞ ◽  
Ferhat ÇEÇEN ◽  
Hakan ÖZTÜRK ◽  
Burhan M. NAVDAR ◽  
İrfan Ş. ÖZTÜRK
Keyword(s):  
Modal Analysis ◽  
Prestressed Concrete ◽  
Experimental Modal Analysis

scholarly journals EXPERIMENTAL MODAL ANALYSIS OF A FLOOR OF A WOODEN HOUSE An Analysis of the floor vibration which is predominanted with high frequency by running train

2009 ◽  
Vol 15 (29) ◽  
pp. 151-154
Author(s):  
Yasuyuki SANO ◽  
Yasuhiko IZUMI ◽  
Shigenori YOKOSHIMA ◽  
Ryuta TOMITA ◽  
Toshihisa ISHIBASHI ◽  
...  
Keyword(s):  
Modal Analysis ◽  
High Frequency ◽  
Experimental Modal Analysis ◽  
Wooden House ◽  
Floor Vibration
Sign in / Sign up

Export Citation Format

Share Document