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Vibrations of membranes - Сообщения
#1 Опубликовано: 28.12.2017 17:10:57
Vibrations of a circular membrane.The axisymmetric case
Solution are described with the help of Bessel functions .
https://en.wikipedia.org/wiki/Vibrations_of_a_circular_membrane



Bessel'2.sm (29 КиБ) скачан 165 раз(а).
Solution are described with the help of Bessel functions .
https://en.wikipedia.org/wiki/Vibrations_of_a_circular_membrane



Bessel'2.sm (29 КиБ) скачан 165 раз(а).
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#2 Опубликовано: 31.12.2017 13:46:43
Tanks Ber7: saved in your named file.
#3 Опубликовано: 06.01.2018 05:14:01
Vibrations of a rectangular membrane
Calculation formulas are taken from the book:S.Timoshenko,
Vibration Problems In Engineering
MemPl.sm (14 КиБ) скачан 170 раз(а).
Файл не найден.Файл не найден.
Файл не найден.Файл не найден.
Calculation formulas are taken from the book:S.Timoshenko,
Vibration Problems In Engineering
MemPl.sm (14 КиБ) скачан 170 раз(а).
Файл не найден.Файл не найден.
Файл не найден.Файл не найден.
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#5 Опубликовано: 19.01.2018 12:37:31
Deflection of simply supported equilateral triangular plate
The plate rests on a frame in the form of an equilateral triangle.
The triangular part of the plate is loaded uniformly distributed
load. The equation of the surface of deflections of a triangular plate is taken
from the book of S.P.Timoshenko.Timoshenko S.P., Woinowsky-Krieger S. Theory of plates and shells. New York, NY: McGraw-Hill; 1959.

triangular plate.sm (12 КиБ) скачан 114 раз(а).
The plate rests on a frame in the form of an equilateral triangle.
The triangular part of the plate is loaded uniformly distributed
load. The equation of the surface of deflections of a triangular plate is taken
from the book of S.P.Timoshenko.Timoshenko S.P., Woinowsky-Krieger S. Theory of plates and shells. New York, NY: McGraw-Hill; 1959.
triangular plate.sm (12 КиБ) скачан 114 раз(а).
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Andrey Ivashov 24.01.2018 16:37:00, Davide Carpi 19.01.2018 20:26:00, NDTM Amarasekera 19.01.2018 22:43:00
#6 Опубликовано: 19.01.2018 14:47:19
Thanks Ber7 for that one and the other one few days ago.
Jean
Jean
#8 Опубликовано: 25.01.2018 23:52:49
WroteI tried to use the plugin Maxima
Thanks Ber7, I love those 3D, though it will never beat Mathcad 8... 11.
On my own, I published several times more than the entire Mathcad Community.
I don't miss them in Smath 6179, why ? purely useless for the Engineer.
They are just for the Gallery [Tom G. would say Peanut Gallery].
We are just waiting for a stable Smath version delivered with Maxima plugin
and more of the possible plugins. Scilab looks far superior to Maxima ?
#9 Опубликовано: 29.01.2018 06:24:36
Deflection of a Circular Plate.Plate contains rigid
inclusion of radius b and loaded at the Center
(Timoshenko,S.and Woinowsky-Krieger, S.,Theory of plates and shells, 1959)



Inclusion.sm (32 КиБ) скачан 113 раз(а).
inclusion of radius b and loaded at the Center
(Timoshenko,S.and Woinowsky-Krieger, S.,Theory of plates and shells, 1959)



Inclusion.sm (32 КиБ) скачан 113 раз(а).
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Davide Carpi 29.01.2018 07:29:00
#10 Опубликовано: 26.01.2019 22:30:30
Hello Beer7, is this vibration of a rectangular membrane equivalent to the deflection of a simply supported, uniformly loaded, rectangular plate? (leaving aside the physical parameters like plate thickness, Young's modulus etc.) I am only interested in the curvature on various locations on the surface, not in absolute values (max deflection can be calculated using simple civil engineering formulaes).
Thanks,
Laurent
Thanks,
Laurent
WroteVibrations of a rectangular membrane
Calculation formulas are taken from the book:S.Timoshenko,
Vibration Problems In Engineering
MemPl.sm (14 КиБ) скачан 170 раз(а).
#11 Опубликовано: 27.01.2019 00:30:46
WroteVibrations of a circular membrane.The axis symmetric case
Solutions are described with the help of Bessel functions .
Thanks Ber7, works great. Beautiful work.
mwbesselj(0,x) is ~ 4 times faster 15 decimals
Hart JZERO 5852 is 23 decimals up to ± 8.
Cheers ... Jean
Bessel JY.sm (75 КиБ) скачан 93 раз(а).
#12 Опубликовано: 27.01.2019 01:55:42
WroteVibrations of a circular membrane.The axis symmetric case
Solutions are described with the help of Bessel functions .
What happened, your previous post is gone with the wind ???
Try this, so much faster !
Bessel mwbesselj Membrane Ber7 [20190126].sm (31 КиБ) скачан 109 раз(а).
#13 Опубликовано: 03.01.2021 05:47:58
Vibrations of a triangular membrane
Calculation formulas are taken from thearticle:
http://ivdon.ru/uploads/article/pdf/IVD_44__1_Chernyshov.pdf_30f490557a.pdf
Vibration triangular membrane.sm (319 КиБ) скачан 77 раз(а).
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Calculation formulas are taken from thearticle:
http://ivdon.ru/uploads/article/pdf/IVD_44__1_Chernyshov.pdf_30f490557a.pdf
Vibration triangular membrane.sm (319 КиБ) скачан 77 раз(а).
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Alvaro Diaz Falconi 04.01.2021 12:30:00
#14 Опубликовано: 03.01.2021 11:28:34
Thanks, works fine after doctoring CreateMesh.
#15 Опубликовано: 03.01.2021 13:23:53
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Alvaro Diaz Falconi 04.01.2021 12:30:00
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