The evolution of multiple shaker induction of pure modes has nonetheless retained a key assumption and consequent test procedure a quarter of a century old -- mode vectors are real, i.e., in phase except for polarity and therefore an in phase force vector should be applied at a single frequency along the jω axis. The validity of the assumption and procedure is limited to undamped or proportionally damped structures. Modern, complex and inhomogeneous hardware seems less likely to satisfy the limiting assumption. The complex modes of non-proportionally damped structures can be induced with two improvements on existing procedure made possible by modern electronics and digital computers -- apply a force vector controlling AMPLITUDE and PHASE and allow COMPLEX FREQUENCY EXCITATION anywhere in the s plane.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Modal Survey Techniques and Theory


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Aerospace Engineering and Manufacturing Meeting ; 1975



    Publication date :

    1975-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Modal survey techniques and theory.

    Sloane,E. / Mc Keever,B. / Time/Data Corp. | Automotive engineering | 1975


    Survey of modal vibration test analysis techniques

    Mustain,R.W. / Rockwell International,Space Div.,US | Automotive engineering | 1976


    Survey of Modal Vibration Test/Analysis Techniques

    Mustain, R.W. | SAE Technical Papers | 1976


    Modal Survey

    NTIS | 1976


    NISAR Modal Survey

    Peng, Chia-Yen / Chen, Bing-Chung | NTRS | 2022