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  • 1
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    Unknown
    Direct system parameter identification of mechanical structures with application to modal analysis (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In this paper a method is described to estimate mechanical structure characteristics in terms of mass, stiffness and damping matrices using measured force input and response data. The estimated matrices can be used to calculate a consistent set of damped natural frequencies and damping values, mode shapes and modal scale factors for the structure. The proposed technique is attractive as an experimental modal analysis method since the estimation of the matrices does not require previous estimation of frequency responses and since the method can be used, without any additional complications, for multiple force input structure testing.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 82-0767 , In: Structures, Structural Dynamics and Materials Conference; May 10, 1982 - May 12, 1982; New Orleans, LA
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Multiple-input experimental modal analysis (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The development of experimental modal analysis techniques is reviewed. System and excitation assumptions are discussed. The methods examined include the forced normal mode excitation method, the frequency response function method, the damped complex exponential response method, the Ibrahim time domain approach, the polyreference approach, and mathematical input-output model methods. The current trend toward multiple input utilization in the estimation of system parameters is noted.
    Keywords: STRUCTURAL MECHANICS
    Type: Experimental Techniques (ISSN 0732-8818); 9; 16s-23s
    Format: text
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    NASA TECHNICAL REPORTS
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