Self-excited limit cycle yaw oscillation instability of external sling payloads with dual-point suspension during level flight

    Research output: Contribution to journalArticle

    Abstract

    This work developed and verified a computational model to predict self-excited limit cycle yaw oscillation (SELCYO) instability of external sling payloads carried under aircraft with dual-point suspension. Inverted-V and inverted-Y slings during steady-state level flight are discussed. The primary goal was to provide a design tool for comparison of the onset of SELCYO between alternate sling geometries. The computational model incorporates steady-state aerodynamic loading during level flight based on scale-model wind tunnel testing. Scale-model sling tests of the onset of SELCYO in the same wind tunnel were used for validation. Predictions of cargo hook load for a full-size HMMWV-M1025 payload carried by inverted-V slings are compared to V-22 Osprey flight-test data. Predictions of stability indicate that stiffer slings are generally more stable, and inverted-V slings are significantly more stable than inverted-Y slings. Small differences between right and left front sling leg lengths caused by rigging error can significantly reduce stability.

    Original languageEnglish (US)
    Article number042008
    JournalJournal of the American Helicopter Society
    Volume60
    Issue number4
    DOIs
    StatePublished - Oct 1 2015

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Aerospace Engineering
    • Mechanics of Materials
    • Mechanical Engineering

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