Experimental Analysis on the Influence of Supports in Performing Pipes Inspection Using Longitudinal Guided Waves
Journal Title: Romanian Journal of Acoustics and Vibration - Year 2013, Vol 10, Issue 1
Abstract
In the last decades, have been investigated guided waves in pipes, due mainly to their capacity of traveling long distances without substantial attenuation. The long range propagation is however limited, among other causes, by the unavoidable pipe supports. These mechanical structures are supporting the pipe weight and reduce its vibrations. Along a certain length, of several centimeters for small diameter pipes, up to tens of centimeters larger diameters, the pipe is in contact with other structures. For small diameters pipes, especially used in aeronautical industry, a rubber circular layer is placed between the pipe and the metallic support. These supports are reducing the guided waves energy sent through the pipe for inspection purposes. For a particular type of support, the resulting amplitudes of the scattered waves can be obtained as function of frequency. In this paper, a particular ultrasonic signal is sent from one end of the pipe and reflected signals are measured. Comparisons of experimental values with numerical simulations are presented and an acceptable agreement was obtained. These are only preliminary results obtained in our laboratory and further work is necessary to include more parameters in the study and obtain individual mode contribution to the scattered field.
Authors and Affiliations
Mihai PREDOI, Ovidiu VASILE, Cristian PETRE
Keywords
Related Articles
- EP ID EP115310
- DOI -
- Views 79
- Downloads 0
The Analysis of Factors That Influence the Sound Absorption Coefficient of Porous Materials
In this paper are presented researches on the identification of factors that influence the sound absorption coefficient of porous materials used for absorption of the sound wave. To achieve these researches were used thr...
Evaluation of the Dissipated Energy in Viscoelastic or Hysteretic Seismic Isolators
This paper represents the result of experimental and theoretical researches concerning the behaviour and the performance level specific to neoprene bearings subjected to conformity assessment. The tandardized test involv...
The influences of undissolved air into the hydraulic agent on dynamics of hydraulic system with rotational drive unit
It is well known from the exploitation activities of hydraulic driving systems that the undissolved air into the hydraulic agent of technological equipments actuating system generates the negative effects regarding the s...
Modal Analysis of the Viaducts Supported on the Elastomeric Insulators within the Bechtel Constructive Solution for the Transilvania Highway
The article presents an approach of six degrees dynamic model of a rigid-solid with some types of symmetries. These symmetries lead to simplified mathematical models, which are easier to solve. If the rigid-solid is join...
Influence of Composite Neoprene upon the Energy Internal Dissipation in case of Harmonic Process
This paper presents the approach performed on viscoelastic systems with such geometrical configuration determining the behaviour as composite neoprene, tested under dynamic regime in two distinct cases, as follows: - sy...