scholarly journals Damage Diagnostics in a Vertical Rod with Concentrated Masses on the Elastic Suspender

2012 ◽  
Vol 2 (5) ◽  
pp. 70-73 ◽  
Author(s):  
A. G. Khakimov
Keyword(s):  
Damage Diagnostics ◽  
Concentrated Masses

APPLICATION OF THE EARLY DAMAGE DIAGNOSTICS TECHNIQUE TO EXAMINATION OF THE AVIATION PANEL

2019 ◽  
Vol 85 (6) ◽  
pp. 53-63 ◽  
Author(s):  
I. E. Vasil’ev ◽  
Yu. G. Matvienko ◽  
A. V. Pankov ◽  
A. G. Kalinin
Keyword(s):  
Acoustic Emission ◽  
Damage Detection ◽  
High Speed ◽  
Early Stage ◽  
Video Data ◽  
High Speed Video ◽  
Damage Diagnostics ◽  
Subsurface Defect ◽  
Sensitive Coating ◽  
Early Damage

The results of using early damage diagnostics technique (developed in the Mechanical Engineering Research Institute of the Russian Academy of Sciences (IMASH RAN) for detecting the latent damage of an aviation panel made of composite material upon bench tensile tests are presented. We have assessed the capabilities of the developed technique and software regarding damage detection at the early stage of panel loading in conditions of elastic strain of the material using brittle strain-sensitive coating and simultaneous crack detection in the coating with a high-speed video camera “Video-print” and acoustic emission system “A-Line 32D.” When revealing a subsurface defect (a notch of the middle stringer) of the aviation panel, the general concept of damage detection at the early stage of loading in conditions of elastic behavior of the material was also tested in the course of the experiment, as well as the software specially developed for cluster analysis and classification of detected location pulses along with the equipment and software for simultaneous recording of video data flows and arrays of acoustic emission (AE) data. Synchronous recording of video images and AE pulses ensured precise control of the cracking process in the brittle strain-sensitive coating (tensocoating)at all stages of the experiment, whereas the use of structural-phenomenological approach kept track of the main trends in damage accumulation at different structural levels and identify the sources of their origin when classifying recorded AE data arrays. The combined use of oxide tensocoatings and high-speed video recording synchronized with the AE control system, provide the possibility of definite determination of the subsurface defect, reveal the maximum principal strains in the area of crack formation, quantify them and identify the main sources of AE signals upon monitoring the state of the aviation panel under loading P = 90 kN, which is about 12% of the critical load.

The Anchor-Last Deployment Problem for Inextensible Mooring Lines

1975 ◽  
Vol 97 (3) ◽  
pp. 1046-1052 ◽  
Author(s):  
Robert C. Rupe ◽  
Robert W. Thresher
Keyword(s):  
Numerical Model ◽  
Equations Of Motion ◽  
Simultaneous Equations ◽  
Mooring Line ◽  
Integration Scheme ◽  
Lumped Mass ◽  
Mooring Lines ◽  
Concentrated Masses ◽  
Predictor Corrector ◽  
Lagrange’S Method

A lumped mass numerical model was developed which predicts the dynamic response of an inextensible mooring line during anchor-last deployment. The mooring line was modeled as a series of concentrated masses connected by massless inextensible links. A set of angles was used for displacement coordinates, and Lagrange’s Method was used to derive the equations of motion. The resulting formulation exhibited inertia coupling, which, for the predictor-corrector integration scheme used, required the solution of a set of linear simultaneous equations to determine the acceleration of each lumped mass. For the selected cases studied the results show that the maximum tension in the cable during deployment will not exceed twice the weight of the cable and anchor in water.

A note on vibrating polar orthotropic circular plates carrying concentrated masses

1986 ◽  
Vol 106 (2) ◽  
pp. 181-186 ◽  
Author(s):  
R.O. Grossi ◽  
P.A.A. Laura ◽  
Y. Narita
Keyword(s):  
Circular Plates ◽  
Concentrated Masses ◽  
Polar Orthotropic

On new types of vibrations of thick cascade junctions with concentrated masses

2013 ◽  
Vol 87 (1) ◽  
pp. 102-106 ◽  
Author(s):  
T. A. Mel’nik ◽  
G. A. Chechkin
Keyword(s):  
Concentrated Masses

A New Mode of Shape Function Approach to Bending Vibrations of a Circular Dise with Concentrated Masses.

1991 ◽  
Vol 57 (537) ◽  
pp. 1440-1445
Author(s):  
Ken-ichi NAGAI ◽  
Yoshihiro OSASA ◽  
Kosuke NAGAYA ◽  
Sadahiko TAKEDA ◽  
Katsuya TANIFUJI
Keyword(s):  
Shape Function ◽  
Function Approach ◽  
Bending Vibrations ◽  
Concentrated Masses
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