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![A.N. Podgorny Institute of Mechanical Engineering Problems, National Academy of Sciences, Ukraine kharkov](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-1.jpg)
A.N. Podgorny Institute of Mechanical Engineering Problems,
National Academy of Sciences, Ukraine
kharkov
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![CONTENTS Introduction and problem statement Mode superposition method for coupled](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-2.jpg)
CONTENTS
Introduction and problem statement
Mode superposition method for coupled dynamic problems
Systems of
the boundary integral equations and some remarks about their numerical implementation
Some numerical results
Conclusion
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![A. Podgorny Institute of Mechanical Engineering Problems The A.N.Podgorny Institute](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-3.jpg)
A. Podgorny Institute of Mechanical Engineering Problems
The A.N.Podgorny Institute for Mechanical Engineering Problems
of the National Academy of Sciences of Ukraine
(IPMash NAS of Ukraine) is a renown research centre in power and mechanical engineering.
IPMash has 5 research departments with a staff of 346 specialists (133 research workers, including one Academician and five Corresponding Members of NAS of Ukraine; and 32 Doctors and 77 Candidates of Science). The Institute also has a special Design-and-Engineering Bureau, and a pilot production facility.
Key research areas
optimisation of processes in power machinery
energy saving technologies
predicting the reliability, dynamic strength and life of power equipment;
simulation and computer technologies in power machine building
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![LIQUID FILLED SHELLS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-4.jpg)
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![PROBLEM STATEMENT with the next set of boundary conditions relative](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-5.jpg)
PROBLEM STATEMENT
with the next set of boundary conditions relative to ϕ
w=(U,n)
fixation
conditions of the shell relative to U
Initial conditions
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![BOUNDARY CONDITIONS ON ELASTIC AND RIGID SURFACES HARMONIC VIBRATIONS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-6.jpg)
BOUNDARY CONDITIONS ON ELASTIC
AND RIGID SURFACES
HARMONIC VIBRATIONS
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![MODE DECOMPOSITION METHOD FOR COUPLED DYNAMIC PROBLEMS Displacements are linear](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-7.jpg)
MODE DECOMPOSITION METHOD FOR COUPLED DYNAMIC PROBLEMS
Displacements are linear combination
of structure natural modes without liquid
uk are the normal modes of vibrations of the empty shell.
the first system of basic functions
Representation for velocity potential
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![BOUNDARY VALUE PROBLEM FOR POTENTIAL POTENTIAL DEFINES ELASTIC WALL VIBRATIONS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-8.jpg)
BOUNDARY VALUE PROBLEM FOR POTENTIAL
POTENTIAL DEFINES ELASTIC WALL VIBRATIONS second system
of basic functions
Boundary value problems for functions
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![Boundary value problem for velocity potential third system of basic](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-9.jpg)
Boundary value problem for velocity potential
third system of basic functions
representation
for velocity potential
harmonic vibrations of liquid in rigid shell
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![SPRING- PENDULUM ANALOGY](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-10.jpg)
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![Three systems of basic functions At first we obtain the](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-11.jpg)
Three systems of basic functions
At first we obtain the natural modes
and frequencies of structure without liquid – the first system of basic functions
Second, we represent the velocity potential
as a sum and for each component consider the corresponding boundary value problem for Laplace equation.
The potential corresponds to the problem of elastic structure vibrations with the liquid but without including the force of gravity - the second system of basic functions
The potential corresponds to the problem of rigid structure vibrations with the liquid including the force of gravity -
the third system of basic functions 12
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![EIGENVALUE PROBLEM fWfe uFOR HARMONIC VIBRATIONS WE HAVE se the](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-12.jpg)
EIGENVALUE PROBLEM
fWfe uFOR HARMONIC VIBRATIONS WE HAVE
se the
We use the
direct BEM formulation
direct BEM formulation
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![FIRST AND SECOND BASIC FUNCTIONS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-13.jpg)
FIRST AND SECOND BASIC FUNCTIONS
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![VIBRATIONS OF RECTANGULAR PLATES MODES OF VIBRATIONS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-14.jpg)
VIBRATIONS OF RECTANGULAR PLATES
MODES OF VIBRATIONS
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![VIBRATIONS OF SECTORIAL PLATES MODES OF VIBRATIONS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-15.jpg)
VIBRATIONS OF SECTORIAL PLATES
MODES OF VIBRATIONS
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![VIBRATIOBS OF FRANSIS TURBINE Without added liquid masses With added liquid masses](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-16.jpg)
VIBRATIOBS OF FRANSIS TURBINE
Without added liquid masses
With added liquid masses
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![FRANSIS TURBINE MODES OF VIBRATIONS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-17.jpg)
FRANSIS TURBINE MODES OF VIBRATIONS
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![Free vibrations of liquid in rigid shells. Boundary value problem. Third system of basic functions.](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-18.jpg)
Free vibrations of liquid in rigid shells. Boundary value problem. Third
system of
basic functions.
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![Singular boundary method THIRD GREEN’S IDENTITY](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-19.jpg)
Singular boundary method
THIRD GREEN’S IDENTITY
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![ONE-DIMENSIONAL BOUNDARY ELEMENTS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-20.jpg)
ONE-DIMENSIONAL BOUNDARY ELEMENTS
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![Singular boundary method](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-21.jpg)
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![Origin intensity factors](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-22.jpg)
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![Origin intensity factors](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-23.jpg)
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![REDUCING TO ELLIPTICAL INTEGRALS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-24.jpg)
REDUCING TO ELLIPTICAL INTEGRALS
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![The system of integral equations Notations The natural modes (third](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-25.jpg)
The system of integral equations
Notations
The natural modes (third system of basic
functions) and eigenvalues problem
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![First five eigenmodes for cylindrical shell with different bottoms using BEM and SBM](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-26.jpg)
First five eigenmodes for cylindrical shell with different bottoms using BEM
and SBM
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![VALIDATION OF SINGULAR BOUNDARY METHOD](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-27.jpg)
VALIDATION OF SINGULAR BOUNDARY METHOD
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![Vibrations of compound cylindrical-spherical elastic shells fluid-filled elastic shell composed](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-28.jpg)
Vibrations of compound cylindrical-spherical elastic shells
fluid-filled elastic shell composed of a
cylindrical part bounded by a hemispherical edge with thickness h=0.01m, radius R=1m, height L=R+H=2m, elasticity modulus E=2,11•106 MPa, Poisson's ratio ν =0.3, mass density ρs=8000 kg/m3, and liquid density ρl=1000 kg/m3
Frequencies of empty and fluid-filled shells, Hz
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![FREE SURFACE VIBRATIONS IN DIFFEREBT SHELLS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-29.jpg)
FREE SURFACE VIBRATIONS IN DIFFEREBT SHELLS
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![BAFFLED SHELLS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-30.jpg)
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![INFLUENCE OF BAFFLES ON SLOSHING AMPLITUDES](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-31.jpg)
INFLUENCE OF BAFFLES ON SLOSHING AMPLITUDES
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![VERTICAL EXCITATIONS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-32.jpg)
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![VERTICAL EXCITATIONS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-33.jpg)
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![Ince-Strutt diagram](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-34.jpg)
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![Free surface elevation without (a) and with (b) longitudinal excitations (a) (b)](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-35.jpg)
Free surface elevation without (a) and with (b) longitudinal excitations
(a) (b)
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![LIQUID VIBRATIONS IN DIFFERENT FUEL TANKS](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-36.jpg)
LIQUID VIBRATIONS IN DIFFERENT FUEL TANKS
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![Thank you very much for your attention](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/316351/slide-37.jpg)
Thank you very much for your attention