• Login
    View Item 
    •   Shocker Open Access Repository Home
    • Engineering
    • Mechanical Engineering
    • ME Research Publications
    • View Item
    •   Shocker Open Access Repository Home
    • Engineering
    • Mechanical Engineering
    • ME Research Publications
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Finite element analysis, Ground Vibration Testing, and characterization of vibration modes for a cantilever plate representing an aircraft wing with and without secondary structure attached

    Date
    2016
    Author
    Nedukanjirathingal, Santhosh Kumar
    Tay, Yi Yang
    Lankarani, Hamid M.
    Metadata
    Show full item record
    Citation
    Nedukanjirathingal, Santhosh Kumar; Tay, Yi Yang; Lankarani, Hamid M. 2016. Finite element analysis, Ground Vibration Testing, and characterization of vibration modes for a cantilever plate representing an aircraft wing with and without secondary structure attached. ASME 2015 International Mechanical Engineering Congress and Exposition, Volume 1: Advances in Aerospace Technology Houston, Texas, USA, November 13–19, 2015
    Abstract
    One of the most critical testing procedures for an airplane certification is Ground Vibration Testing (GVT). With proper GVT analysts can determine the stiffness distribution, natural frequencies, mode shapes and structural damping of each airplane components, which are needed for flutter and dynamic loads analyses. Hence, the results from GVT are crucial. The problem identified in this study is focused on structural design, which can lead to catastrophic situations, if proper attention is not given to GVT results. In GVT, analysts attempt to instrument most of the primary components of the airplane while often neglecting secondary structures such as bungees, gears, control surfaces, etc. These secondary structures must also be considered during GVT in identifying the in-phase and out-of-phase modes in order to achieve higher accuracy when tuning the stiffness of the primary structure. During the stiffness tuning process for the flutter analysis, tuning the primary structure stiffness to in-phase torsion mode can be considered as a conservative approach and will require design change. Conversely, if the stiffness of the primary structure is tuned to out-of-phase torsion mode, which is always higher, the analysis becomes unconservative. The goal of this study is to reconstruct the above-mentioned problem of in-phase and out-of-phase vibration modes of a cantilever plate with an attached secondary structure, replicating a simple model of aircraft wing structure. This includes performing the modal experiments and finite element analysis (FEA) of a cantilever plate (primary structure) with and without flexible links (secondary structure) attached to the plate and characterizing the in-phase and out-of-phase modes of the flexible links. A thorough study using frequency response functions (FRFs) is performed to characterize the modes using different accelerometer 'raw data' readings measured from different locations on the dynamic system. For GVT of the cantilever plate, natural frequencies associated with the respective mode shapes are identified and calculated and a comparison is made between the test results, the FEA results, and from an analytical approach. A parametric study is then conducted to evaluate and quantify the change in the frequencies of the in-phase and out-of-phase modes with the change in the chord-wise and span-wise location of the flexible attachment of the secondary structure to the primary structure, and due to the change in the compliant stiffness of the flexible link to the plate. Proper identification and correlation of the modes and natural frequencies of the cantilever plate with and without the secondary structure are presented. It is concluded that the in-phase and out-of-phase torsion frequencies increased with higher compliant stiffness. With the chord-wise change in location of the flexible link, both the in-phase and out-of-phase frequencies increased when the center of gravity of the link move towards the center of the chord from both leading and trailing edges of the plate. With the span-wise change in CG of the link, the in-phase frequency reduced with span (i.e., when the CG moves away from the constraint location of the plate) and the out-of--phase frequency increased.
    Description
    Click on the DOI link to access the article (may not be free).
    URI
    http://dx.doi.org/10.1115/IMECE2015-51020
    http://hdl.handle.net/10057/12311
    Collections
    • ME Research Publications

    Browse

    All of Shocker Open Access RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsBy TypeThis CollectionBy Issue DateAuthorsTitlesSubjectsBy Type

    My Account

    LoginRegister

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    DSpace software copyright © 2002-2022  DuraSpace
    DSpace Express is a service operated by 
    Atmire NV