modal analysis for a CANTILEVER BEAM

ACT

Hi there,

I am a beginner and I need to do analytical derivation of a beam and model it in matlab.

the beam is cantilever and it is excited at its cantilever end

any hints to start?

Cheers

Mech_Engineer

Have you learned how to derive the equations of state for a beam through multiple integrations of its loading or shear force diagrams?

ACT

nto really! would u recommend a book please? thanks

ACT

Hello,

I am looking for explanations and detailed studies or even brief ones about the differences in Vibration analysis and dynamic studies as well as static analysis between

Timoskenko beam and .Euler-bernoulli beam

when should i use Euler-bernoulli beam?

Thanks

Mech_Engineer

You shouldn't make a new thread each time you have a single new question, just ask in the related thread instead...

Anyway, they are two approximations that take into account a different depth of effects in the beam...

http://en.wikipedia.org/wiki/Timoshenko_beam_theory

http://en.wikipedia.org/wiki/Euler-B..._beam_equation

Timoshenko theory takes into account shear deformation, rotational inertia, and other effects while Euler-Bernoulli is a simple but effective theory that is easier to understand an solve for, but may be less accurate depending on the complex loading, geometry, or deflection of the beam.

In any case, it is necessary that a certain degree of "engineering discretion" is used to decide which theory is best for your application and how improtant and accurate a result will be.

ACT

am not quite sue what you mean here ?!

Mech_Engineer

This thread could be helpful for you:

http://www.physicsforums.com/showthread.php?t=209319

Mech_Engineer

It sounds to me like this is a homework question, have you done any looking in your text book on how to calculate the vibrational modes of a beam?

abhishek ghos

Here's our project on modal analysis of cantilever beam using Abaqus
http://www.scribd.com/doc/96781678/M...antilever-Beam