Vibration characteristics of a corrugated cylindrical shell piezoelectric transducer

2008 ◽  
Vol 55 (11) ◽  
pp. 2502-2508 ◽  
Author(s):  
Limei Xu ◽  
Min Chen ◽  
Hualong Du ◽  
Hongping Hu ◽  
Yuantai Hu ◽  
...  
Keyword(s):  
Cylindrical Shell ◽  
Piezoelectric Transducer ◽  
Vibration Characteristics ◽  
Corrugated Cylindrical Shell

scholarly journals Wave Based Method for Free Vibration Analysis of Ring Stiffened Cylindrical Shell with Intermediate Large Frame Ribs

2013 ◽  
Vol 20 (3) ◽  
pp. 459-479 ◽  
Author(s):  
Meixia Chen ◽  
Jianhui Wei ◽  
Kun Xie ◽  
Naiqi Deng ◽  
Guoxiang Hou
Keyword(s):  
Cylindrical Shell ◽  
Free Vibration ◽  
Boundary Conditions ◽  
Natural Frequencies ◽  
Free Vibration Analysis ◽  
Structure Type ◽  
Vibration Characteristics ◽  
Mode Shapes ◽  
Arbitrary Boundary ◽  
Stiffened Cylindrical Shell

Wave based method which can be recognized as a semi-analytical and semi-numerical method is presented to analyze the free vibration characteristics of ring stiffened cylindrical shell with intermediate large frame ribs for arbitrary boundary conditions. According to the structure type and the positions of discontinuities, the model is divided into different substructures whose vibration field is expanded by wave functions which are exactly analytical solutions to the governing equations of the motions of corresponding structure type. Boundary conditions and continuity equations between different substructures are used to form the final matrix to be solved. Natural frequencies and vibration mode shapes are calculated by wave based method and the results show good agreement with finite element method for clamped-clamped, shear diaphragm – shear diaphragm and free-free boundary conditions. Free vibration characteristics of ring stiffened cylindrical shells with intermediate large frame ribs are compared with those with bulkheads and those with all ordinary ribs. Effects of the size, the number and the distribution of intermediate large frame rib are investigated. The frame rib which is large enough is playing a role as bulkhead, which can be considered imposing simply supported and clamped constraints at one end of the cabin and dividing the cylindrical shell into several cabins vibrating separately at their own natural frequencies.

scholarly journals Free Vibration Characteristics of Cylindrical Shells Using a Wave Propagation Method

2001 ◽  
Vol 8 (2) ◽  
pp. 71-84 ◽  
Author(s):  
A. Ghoshal ◽  
S. Parthan ◽  
D. Hughes ◽  
M.J. Schulz
Keyword(s):  
Cylindrical Shell ◽  
Wave Propagation ◽  
Free Vibration ◽  
Periodic Structure ◽  
Natural Frequencies ◽  
Vibration Characteristics ◽  
Structural Element ◽  
Lower Bounding ◽  
Nodal Points ◽  
Wave Propagation Method

In the present paper, concept of a periodic structure is used to study the characteristics of the natural frequencies of a complete unstiffened cylindrical shell. A segment of the shell between two consecutive nodal points is chosen to be a periodic structural element. The present effort is to modify Mead and Bardell's approach to study the free vibration characteristics of unstiffened cylindrical shell. The Love-Timoshenko formulation for the strain energy is used in conjunction with Hamilton's principle to compute the natural propagation constants for two shell geometries and different circumferential nodal patterns employing Floquet's principle. The natural frequencies were obtained using Sengupta's method and were compared with those obtained from classical Arnold-Warburton's method. The results from the wave propagation method were found to compare identically with the classical methods, since both the methods lead to the exact solution of the same problem. Thus consideration of the shell segment between two consecutive nodal points as a periodic structure is validated. The variations of the phase constants at the lower bounding frequency for the first propagation band for different nodal patterns have been computed. The method is highly computationally efficient.

Application of Squeeze Film Ultrasonic Levitation

2014 ◽  
Vol 1049-1050 ◽  
pp. 1067-1070
Author(s):  
Lin Hao Cong ◽  
Dong Ming Li
Keyword(s):  
Piezoelectric Transducer ◽  
Vibration Characteristics ◽  
Squeeze Film ◽  
Loading Capacity ◽  
Main Application ◽  
Cylindrical Shaft

In this article the principle of gas squeeze film levitation is described and the main application of it is introduced respectively according to the vibration mode.A new piezoelectric transducer applied for squeeze film bearing which is used for cylindrical shaft and can realize equably circumferential fixed support is proposed, the vibration characteristics of it is studied and the bearing’s loading capacity is tested.

Acoustic and Vibration Characteristics of Finite Cylindrical Shell-Circular Plate Based on Lagrange Equations

2013 ◽  
Vol 302 ◽  
pp. 401-405
Author(s):  
Qi Zheng Zhou ◽  
De Shi Wang ◽  
Shu Yang
Keyword(s):  
Cylindrical Shell ◽  
Boundary Conditions ◽  
Circular Plate ◽  
Acoustic Radiation ◽  
Vibration Characteristics ◽  
Finite Cylinder ◽  
Lagrange Equations ◽  
Coupling Conditions ◽  
Set Up ◽  
Finite Cylindrical Shell

An analysis based on Lagrange equations was presented for acoustic and vibration characteristics of finite cylindrical shell-circular plate underwater. The boundary conditions and coupling conditions between the shell and plate expressed using springs, the model of finite shell with circular plate was set up. Considering the elastic potential energy in springs and the work due to fluid loading, the vibro-acoustic equations of finite cylinder with circular plate under excitation were established by Lagrange equations. The influences of boundary conditions and coupling conditions to the acoustic and vibration characteristics were researched. The results show that . The results could be used to control the underwater vehicle’s vibration and acoustic radiation.

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