On determination of vibration characteristics of a beam with a closing crack in bending vibrations

2000 ◽  
Vol 32 (3) ◽  
pp. 211-224 ◽  
Author(s):  
V. V. Matveev ◽  
A. P. Bovsunovskii
Keyword(s):  
Vibration Characteristics ◽  
Bending Vibrations ◽  
Closing Crack

scholarly journals Flexural Vibration Test of a Beam Elastically Restrained at One End: A New Approach for Young’s Modulus Determination

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Rafael M. Digilov ◽  
Haim Abramovich
Keyword(s):  
Young Modulus ◽  
Flexural Vibration ◽  
Force Sensor ◽  
Frequency Equation ◽  
Bending Vibrations ◽  
Flexural Vibration Test ◽  
Elastically Restrained ◽  
Fixed End ◽  
Partially Restrained

A new vibration beam technique for the fast determination of the dynamic Young modulus is developed. The method is based on measuring the resonant frequency of flexural vibrations of a partially restrained rectangular beam. The strip-shaped specimen fixed at one end to a force sensor and free at the other forms the Euler Bernoulli cantilever beam with linear and torsion spring on the fixed end. The beam is subjected to free bending vibrations by simply releasing it from a flexural position and its dynamic response detected by the force sensor is processed by FFT analysis. Identified natural frequencies are initially used in the frequency equation to find the corresponding modal numbers and then to calculate the Young modulus. The validity of the procedure was tested on a number of industrial materials by comparing the measured modulus with known values from the literature and good agreement was found.

A SEARCH OF AN INDUCER GEOMETRY THAT IS BENEFICIAL FOR LIFTING PARAMETERS OF A LIFTED OBJECT OF A SELECTED SHAPE

Tribologia ◽  
2019 ◽  
Vol 287 (5) ◽  
pp. 13-17
Author(s):  
Bartosz BASTIAN ◽  
Rafał GAWARKIEWICZ
Keyword(s):  
Fluid Dynamics ◽  
Experimental Verification ◽  
Vibration Characteristics ◽  
Squeeze Film ◽  
Acoustic Levitation ◽  
Dynamics Calculation ◽  
Dimension Ratio

The literature describes acoustic levitation phenomena with the utilization of air squeeze film between the vibrating inducer and the lifted object. The objective of the study is to determine the shape of the inducer with vibration characteristics that would allow the levitation of an object of the assumed geometry. In this paper, the influence of the dimension ratio of the inducer on the frequency of the first mode of vibration was presented. CFD calculations for a selected dimension series were performed with the goal of the determination of lifting conditions. The data obtained from the analysis will be used to manufacture an inducer that will serve as an experimental verification for the fluid dynamics calculation.

Experimental Determination of Vibration Characteristics of Vertical Steam Generator Involute Screens for WWER Reactor

2017 ◽  
Vol 14 (4) ◽  
pp. 113-121
Author(s):  
A.M. Besedin ◽  
V.M. Kovalenko ◽  
S.Yu. Chesnakova ◽  
A.Yu. Smolin
Keyword(s):  
Experimental Determination ◽  
Steam Generator ◽  
Vibration Characteristics

scholarly journals A Study of Vibration Characteristics and Determination of the Conditions of Nanopores Formation in Metallic Materials during Laser Action

2015 ◽  
Vol 106 ◽  
pp. 266-271 ◽  
Author(s):  
Serguei P. Murzin ◽  
Evgeniy V. Shakhmatov ◽  
Alexander A. Igolkin ◽  
Luiza F. Musaakhunova
Keyword(s):  
Laser Action ◽  
Vibration Characteristics ◽  
Metallic Materials
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