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Experimental identification of finite cylindrical shell vibration modes
Lionel Haumesser1, Dominique Décultot, Fernand Léon
1Laboratoire d'Acoustique Ultrasonore et d'Electronique, UMR CNRS 6068, Université du Havre, Le Havre, France.
The Journal of the Acoustical Society of America
|June 8, 2002
Summary
This study investigates acoustic scattering from a stainless steel cylindrical shell in water. It identifies vibration modes using bistatic measurements, correlating them with guided wave propagation for enhanced understanding of shell acoustics.
Area of Science:
- Acoustics
- Mechanical Engineering
- Materials Science
Background:
- Investigates acoustic scattering phenomena.
- Focuses on finite air-filled elastic cylindrical shells immersed in water.
- Utilizes a stainless steel shell with a 17% thickness to outer radius ratio.
Purpose of the Study:
- To identify vibration modes in a cylindrical shell.
- To understand the relationship between guided wave propagation (T0) and acoustic scattering.
- To analyze the influence of incidence angle on resonance spectra.
Main Methods:
- Employs bistatic acoustic measurements.
- Uses a rotating receiver transducer to identify circumferential vibration modes.
- Moves the receiver transducer axially to identify longitudinal vibration modes.
- Corroborates experimental data with theoretical calculations for thick finite cylindrical shells.
Main Results:
- Identifies vibration modes related to the phase matching of the first guided wave (T0).
- Presents results as functions of dimensionless frequency, azimuthal angle, and axial wave number.
- Discusses the evolution of mode positions with respect to incidence angle.
Conclusions:
- Experimental results are validated by theoretical approximations.
- The study clarifies peak patterns in backscattered resonance spectra.
- Provides insights into the acoustic behavior of elastic cylindrical shells.