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Hi dear friends, I have a question about flutter phenomena. As you know, flutter occurs when two modes ( for example first mode and second mode ) coincide ( I mean after a specific velocity, the frequencies of two modes, will be the same and equal) and the damping term will change into positive...

Hi friends, I am working on piezoelectric patch and I have a question. I want to know if piezoelectric ceramic (PZT) material withstand the stress due to the applied maximum voltage. How is it possible to calculate it ?! What are the relations ? Thank you in advance.

Hi friends, I am working on piezoelectric patch and I have a question. I want to know if piezoelectric ceramic (PZT) material withstand the stress due to the applied maximum voltage. How is it possible to calculate it ?! What are the relations ? Thank you in advance.

Thank you all for your great help. I want to know how it is possible to plot the mode shapes ( a static display of a mode shape ) using Complex Eigen vectors ?! Assume that these are my Eigenvavlues : Landa1= 5+2i Landa2=5-2i and corresponding Eigenvectors are : V1=[1 1-2i]T V2=[1 1+2i]T

My structure is a continuous simply supported beam. I have problem with calculating its mode shapes using eigenvectors !! I mean I don't know how to use eigenvectors or eigenvalues to calculate mode shapes of a n-DOF ( n Degree Of Freedom ) system!! ( Here, my problem is a 6 DOF system! ) Does...

Dear friends, I am a beginner in the mechanical vibration field. I have the EOM ( Equation Of Motion ) of my problem in the standard form ( Mxtt+Cxt+Kx=0).Then, in the next stage, I uesd State-space form ( AXt+BX=0 ) of my EOM to calculate the eigenvalues of the system in order to extract the...

Hello Friends, I want to derive the vibration formulation of a sandwich beam with 7 layers using Hamilton principle. I have already searched on the internet for any possible book or paper, but I couldn't find anything useful. Could you please help and tell me a website, book, paper or...

Hi guys, I want to model non-Newtonian viscosity in MSC.PATRAN !! I have some points relating to my viscosity function. Does anyone know how it is possible to model it in MSC.PATRAN ??!! Thank you in advance.

Hi Dear friends, I want to model non-Newtonian viscosity in NASTRAN !! I have some points relating to my viscosity function. Does anyone know how it is possible to model it in NASTRAN ??!! Thank you in advance. [smarty]