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Related Experiment Videos

Frame junction vibration transmission with a modified frame deformation model.

J A Moore1

  • 1Cambridge Collaborative, Inc., Massachusetts 02138.

The Journal of the Acoustical Society of America
|December 1, 1990
PubMed
Summary
This summary is machine-generated.

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This study models vibration transmission in aircraft frames, considering skin panel constraints. Out-of-plane bending is crucial for vibratory energy transfer, validated by helicopter airframe data.

Area of Science:

  • Mechanical Engineering
  • Acoustics
  • Vibration Analysis

Background:

  • Previous models allowed bending, torsion, and longitudinal motions in frame junctions.
  • Aircraft skin panels restrict in-plane motion, coupling bending and torsional frame dynamics.
  • Deep web frames in aircraft structures necessitate accounting for transverse shear deformation.

Purpose of the Study:

  • To investigate vibration transmission through frame junctions with in-plane motion constraints.
  • To model the effect of skin panels prohibiting in-plane frame motion.
  • To incorporate transverse shear deformation in frame junction analysis for aircraft structures.

Main Methods:

  • Developed a model assuming skin panels completely prohibit in-plane frame motion.

Related Experiment Videos

  • Included transverse shear deformation for deep web frame analysis.
  • Implemented the frame junction model within a statistical energy analysis (SEA) code.

    • Main Results:

    • Out-of-plane bending deformation significantly impacts vibratory energy transmission in aircraft structures.
    • Model predictions show good agreement with measured vibration transmission data from a helicopter airframe.
    • The model successfully integrates into a general-purpose SEA code for airframe analysis.

    Conclusions:

    • In-plane constraints imposed by skin panels are critical for accurate vibration transmission analysis in aircraft.
    • Out-of-plane bending is a dominant factor in vibratory energy propagation through frame junctions.
    • The developed model provides a valuable tool for predicting and mitigating vibration in airframe structures.