An experimental–numerical modal analysis for the study of shell-fluid interactions in a clamped hemispherical shell

Eslaminejad, Ashkan; Ziejewski, Mariusz; Karami, G.

doi:10.1016/j.apacoust.2019.03.029

Cited by 16 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The coupling ASI of the FE method was defined as the equal normal direction displacement in acoustic fluid and solid at the interaction surfaces nodes. The governing equation of motion of the ASI coupling condition is given as Equation () [ 13 ] :

([], \begin{matrix} ([], M_{s}) & 0 \\ ρ_{0} {[R]}^{T} & ([], M_{F}) \end{matrix}) ({}, \begin{matrix} \overset{U}{true} \\ \overset{P}{true} \end{matrix}) + ([], \begin{matrix} ([], C_{s}) & 0 \\ 0 & ([], C_{F}) \end{matrix}) ({}, \begin{matrix} \overset{U}{true} \\ \overset{P}{true} \end{matrix}) + ([], \begin{matrix} ([], K_{S}) & - ([], R) \\ 0 & ([], K_{F}) \end{matrix}) ({}, \begin{matrix} U \\ P \end{matrix}) = ({}, \begin{matrix} F_{S} \\ F_{F} \end{matrix})

where U , P , M , C , K , F , and R are the displacement and rotation DOF vector, fluid acoustics pressure DOF, mass, damping, stiffness, force, and reaction impedance, respectively. The subscript S indicates solid properties and subscript F indicates fluid properties.…”

Section: Methodsmentioning

confidence: 99%

Section: Finite Element Formulationmentioning

confidence: 99%

“…Rawat et al [ 12 ] investigated a seismic analysis of a ground‐supported, three‐dimensional, rigid‐base steel cylindrical liquid storage tank, using a coupled acoustic‐structural FE method for fluid–structure interaction. Eslaminejad et al [ 13 ] considered the vibration of an aluminium hemispherical shell filled with inviscid compressible fluid, and the modal frequencies, damping ratio, and mode shapes of the shell were experimentally determined using a roving hammer‐impact test. Hafiz and Schumacher [ 14 ] employed an instrumented hammer used for impulse response testing to initiate vibrations and to subsequently estimate the natural frequencies up to the 13th mode and modes of a large‐scale laboratory concrete girder.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental and numerical modal analysis of wall tubes in the coal‐fired boiler or radiant syngas cooler

et al. 2021

View full text Add to dashboard Cite

The slag deposited on the wall tubes in the coal-fired boiler or radiant syngas cooler (RSC) of the entrained flow gasifier could reduce the heat transfer efficiency and degrade the tubes by corrosion. During the operation of the boiler or RSC, the rapping-off-ash method is an effective method to remove slag deposits, especially in a high-pressure environment. The operating parameters of the rapping-off-ash method are related to the modal parameters of wall tubes, including the natural frequency, damping ratio, and mode shapes. In

show abstract

([], \begin{matrix} ([], M_{s}) & 0 \\ ρ_{0} {[R]}^{T} & ([], M_{F}) \end{matrix}) ({}, \begin{matrix} \overset{U}{true} \\ \overset{P}{true} \end{matrix}) + ([], \begin{matrix} ([], C_{s}) & 0 \\ 0 & ([], C_{F}) \end{matrix}) ({}, \begin{matrix} \overset{U}{true} \\ \overset{P}{true} \end{matrix}) + ([], \begin{matrix} ([], K_{S}) & - ([], R) \\ 0 & ([], K_{F}) \end{matrix}) ({}, \begin{matrix} U \\ P \end{matrix}) = ({}, \begin{matrix} F_{S} \\ F_{F} \end{matrix})

Section: Methodsmentioning

confidence: 99%

Section: Finite Element Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and numerical modal analysis of wall tubes in the coal‐fired boiler or radiant syngas cooler

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The vibration analyses, consisting of modal analysis and harmonic analysis, were performed using the finite element method (FEM). Modal analysis was conducted to get the characteristics of the system, including its natural frequency and corresponding vibration modes (Eslaminejad et al, 2019). These parameters are the foundation for harmonic response analysis, which results in a response at every determined frequency.…”

Section: Ultrasound Prototype Design and Manufacturementioning

confidence: 99%

Bacterial Cell Inactivation Using a Single-Frequency Batch-Type Ultrasound Device

Sambegoro¹,

Fitriyanti²,

Budiman³

et al. 2021

Indonesian J. Sci. Technol

View full text Add to dashboard Cite

Ultrasound technology employs cavitation to generate high-pressure soundwaves to disrupt bacterial cells. This study reveals the effectiveness of a single frequency ultrasound device for bacterial cell inactivation. A low-cost ultrasound device having a single frequency, i.e. 22 kHz for lab-scale application, was developed first, and the prototype was mechanically designed and analyzed using the finite-element method to assure the targeted natural frequency could be achieved. The prototype was then tested inactivating bacterial cells, Escherichia coli (E. coli) and Bacillus subtilis (B. subtilis), in a simple medium and a food system, and the results were then compared to a commercial system. A treatment time of up to 15 minutes was able to reduce E. coli and B. subtilis cells by 3.3 log and 2.8 log, respectively, and these results were similar to those of the commercial system. The effectiveness of bacterial cell inactivation using the developed single-frequency ultrasound device is then discussed. The findings are useful for designing low-cost ultrasound devices for application in the food industry.

show abstract

“…The shells were meshed using Shell 181 elements 18,19 and FSI was modelled using acoustic elements 12,20 . The fluid was modelled using 3D Fluid 30 elements.…”

Section: Modal Analysis Using Ansysmentioning

confidence: 99%

Study of Vibration Behaviour of Stiffened Polymer Composite Shells for Underwater Structural Applications

Patil¹,

Murthy²,

Srivatsa³

et al. 2020

Def. Sc. Jl.

View full text Add to dashboard Cite

This paper presents vibration behavior of ring stiffened polymer composite thick shells used for underwater structures. Filament wound shells stiffened with internal and external rings and with hemispherical ends were tested for vibration in air and water in free-free boundary condition using roving hammer and fixed response method. Modal testing of the shells was performed under hydrostatic loading in a custom designed buckling tester for determining natural frequency at higher sea depths. Accelerometer was mounted on the inner surface of the shell. It was excited using a plumbob, rope and pulley arrangement. Experimental results were validated by modal analysis using Hyperworks and ANSYS. Vibration behavior in water was simulated by Fluid structure interaction approach. Experimental first natural frequency in water was lesser than that in air. With increase in hydrostatic pressure, the shell showed moderate variation in natural frequency. The experimental and numerical results of natural frequency and mode shapes were in good agreement with each other. Natural frequencies were lower in long and thick shells.

show abstract

An experimental–numerical modal analysis for the study of shell-fluid interactions in a clamped hemispherical shell

Cited by 16 publications

References 24 publications

Experimental and numerical modal analysis of wall tubes in the coal‐fired boiler or radiant syngas cooler

Experimental and numerical modal analysis of wall tubes in the coal‐fired boiler or radiant syngas cooler

Bacterial Cell Inactivation Using a Single-Frequency Batch-Type Ultrasound Device

Study of Vibration Behaviour of Stiffened Polymer Composite Shells for Underwater Structural Applications

Contact Info

Product

Resources

About