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  1. harryhaller

    Animating complex shapes

    Please ignore the formula in the first post, thats not what I've written, I didn`t have the code in front of me when I wrote my original post, my brain must need defragmenting. My code goes as follows degrees = 0 to 360 in 10 degree steps real(mode shape) * cos(degrees) + imag(mode...
  2. harryhaller

    Animating complex shapes

    I've written my own software. I'm comparing it against Vibrant technology's Mescope.
  3. harryhaller

    Animating complex shapes

    Hello, I don't know if this is the right forum for this. I would like to animate some mode shapes, at the moment I have written my program so that it uses cos(real part of mode shape) + sin(imaginary part of the mode shape). This indeed produces a shape which seems correct, but when I...
  4. harryhaller

    psychoacoustics

    There are some good programs for calculating loudness here http://hearing.psychol.cam.ac.uk/Demos/demos.html
  5. harryhaller

    static stiffness from dynamic stiffness?

    Thank you very much Dr. Platten, that is very helpful indeed, I understand now from your excellent explaination, the importance of constraint. If I could bother you with one more question, If we did a modal analysis on the ruler in your example in free/free condition and determined the...
  6. harryhaller

    static stiffness from dynamic stiffness?

    Hmm, I think I'm confused. Dr. Platten, what you explain makes sense, but are not the modes present in the metal plate suspended in free/free condition entirely due to the stiffness and mass distribution and damping coefficient of the said plate? Maybe my terminology is wrong, I am interested...
  7. harryhaller

    static stiffness from dynamic stiffness?

    Thankyou Dr. Platten, It's true that the player does have an influence, although involving a player while taking measurements introduces too many factors that are not reproducible and therefore comparisons between instruments are made impossible. When making measurements, I usually support the...
  8. harryhaller

    static stiffness from dynamic stiffness?

    Thank you Mr. Locock, I am interested in the stiffness of the finished musical instrument in playing condition, so bolting it to a large block of concrete is out of the question. Until now I have been measuring the frf's in free/free condition. Is it possible to calculate the static stiffness...
  9. harryhaller

    static stiffness from dynamic stiffness?

    Hi, I'm an amateur vibration engineer. My real work is building bowed string instruments. But I have used modal analysis to observe the dynamic properties of the instruments and help me make descisions on how I could improve them. My question is it possible to calculate the static stiffness and...
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