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  1. aeroaero

    Nonlinear response of a cantilever beam

    Hi all, I am working on the geometrically nonlinear dynamic response of a cantilever beam using an in-house FEM code. I have a 16 m cantilever beam whose fundamental frequency is around 5 Hz. In a particular simulation, I discretized the beam into 50 elements and tried to use a time-step of...
  2. aeroaero

    Upgrade from 7.3 to a higher version of Red-hat

    Hi all, I have Red hat 7.3 on my system and would like to upgrade to a higher version preferably 9.0. I am wondering if I would lose my data if I do it. My hunch is that it should'nt. Can someone confirm this ? Thanks, aeroaero
  3. aeroaero

    4/rev HUB LOADS

    Hi all, Can someone explain to me briefly as to what 4/rev hub loads mean exactly ?? I know that I will see 4 wavelengths in the response if it is 4/rev and similarly for other kinds of response. But, I don't understand the physical significance behind this. Why am I seeing 4 wavelengths in the...
  4. aeroaero

    Basic book on helicopter theory

    Hello all, Can someone tell me if there is any really basic book on helicopter theory ? I was trying to understand concepts like 2/rev, 4/rev vibratory load variation/response and all that. There was no clear introduction of small things like this in books of Leishman and even Johnson too. I am...
  5. aeroaero

    MATLAB ARMA FUNCTION

    Hi all, Did anyone ever use the ARMA function of MATLAB system identification toolbox to estimate parameters of an ARMA model fitted to a time-series data ?? Thanks in advance, aero
  6. aeroaero

    ARMA / AR MODELS

    Hi all, Does anyone know of any good softwares (apart from MATLAB/MATHEMATICA) which could be used to estimate parameters of an ARMA model from time-series data ? Thanks in advance, aero
  7. aeroaero

    Sanity check of a stiffness matrix

    Hi all, I have a stiffness matrix sent to me and was asked to check the sanity of it and identify the physical process that it might have come from. I have gone through a number of FEM texts to get an idea about sanity, but was of no use. Can someone give me a clue atleast as to how I can do...

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