An experimental investigation into the use of scaling laws for predicting vibration responses of rectangular thin plates

2008 ◽  
Vol 311 (1-2) ◽  
pp. 314-327 ◽  
Author(s):  
Pairod Singhatanadgid ◽  
Anawat Na Songkhla
Keyword(s):  
Experimental Investigation ◽  
Scaling Laws ◽  
Thin Plates ◽  
Vibration Responses

Experimental Investigations on ThermoMechanical Tensioning (TMT), comparison with Heat Sink, and Its Application to a Grillage Structure

2020 ◽  
pp. 1-8
Author(s):  
Amith Gadagi ◽  
Nisith Ranjan Mandal ◽  
Om Prakash Sha ◽  
Sharat Kumar ◽  
Sanyappa Pujari ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Control Mechanism ◽  
Thin Plates ◽  
Experimental Investigations ◽  
Ship Structures ◽  
Buckling Strength ◽  
Distortion Control ◽  
Out Of Plane ◽  
Transverse Welds ◽  
Heat Sinking

Thin plates, which are widely used in ship structures, undergo weld-induced buckling distortions because of their lower critical buckling strength. Thus, there is a need for an active in-process distortion control mechanism in the welding involving thin plates. In this regard, a ThermoMechanical Tensioning (TMT) method was developed and implemented successfully. In the current work, experimental investigation of the effect of TMT pull on the resulting welding distortions is studied and also the TMT process is compared with a heat sinking technique. The experimental results indicate that an increase in the TMT pull would reduce the extent of weld-induced buckling distortions. The results also suggest that a complicated heat sinking technique can be effectively replaced by a TMT process in reducing the welding out-of-plane distortions. The concept of TMT is further extended to the fabrication of grillage structures used in ship structures, which includes longitudinal and transverse welds.

Experimental Investigation of Vortex-Induced Vibration Responses of Tension Riser Transporting Fluid

2009 ◽  
Author(s):  
Yongbo Zhang ◽  
Fanshun Meng ◽  
Haiyan Guo
Keyword(s):  
Experimental Investigation ◽  
Frequency Spectrum ◽  
Cross Flow ◽  
Internal Flow ◽  
Strain Gauges ◽  
Test Results ◽  
Amplitude Response ◽  
Flowing Fluid ◽  
Vortex Induced Vibrations ◽  
Vibration Responses

This paper presents the test results of a vertically tensioned riser model under vortex-induced vibrations. The influence of internal flowing fluid and top tensions on the riser behavior is investigated. Twelve strain gauges were mounted on the riser and both the in-line and cross-flow responses at locations were measured. The frequency spectrum and amplitude response were derived from the strain date. The influences of internal flow and top tensions on two kinds of model risers are analyzed and some conclusions are drawn.

An Experimental Investigation on the Vibration Responses of a Mild Steel Sandwich Shaft Disc System

2012 ◽  
Vol 584 ◽  
pp. 391-395 ◽  
Author(s):  
R. Venkatachalam ◽  
S. Balasivanandha Prabu
Keyword(s):  
Experimental Investigation ◽  
Mild Steel ◽  
Natural Frequency ◽  
Software Package ◽  
Length Variation ◽  
Analysis Software ◽  
Shaft Length ◽  
Element Analysis ◽  
Vibration Responses ◽  
Parameter Values

The main aim of this work is to identify the natural frequency of mild steel sandwich shaft disc system. An experimental evaluation is completed to evaluate the natural frequency and damping response of mild steel sandwich shaft disc system using Lab VIEW 8.5 software and National Instrument’s data acquisition (DAQ) system. The validation of the experimental results carried out using ANSYS 13.0, a finite element analysis software package. In addition, the effect of shaft thickness, disc thickness, shaft length variation, second, third, four and five systems also studied. The outcome of the results show that the increase in the parameter values have significant effect in the vibration responses of the mild steel sandwich shaft disc system which provide very much helpful information for the designers and researchers.

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