Cheng Chi
Vacuum and hover tests of a dihedral–anhedral tip composite rotor
Chi, Cheng; Datta, Anubhav; Panda, Brahmananda
Authors
Anubhav Datta
Brahmananda Panda
Abstract
This paper presents test data from vacuum and hover tests of a 2.8-ft-radius dihedral–anhedral tip composite rotor. The paper describes the blades, their fabrication, properties, instrumentation, the test conditions, and the data acquired. The blades were Mach-scaled to a generic but representative modern rotor. Vacuum chamber tests measured rotating frequencies and strains. Hover tests measured performance, blade loads, pitch-link loads, and strains under steady and cyclic loading conditions. Three-dimensional finite element structural models were developed to ensure completeness and consistency of property definition. The three-dimensional analysis was also used for a preliminary assessment of the test data. The test data revealed that the dihedral–anhedral tip influences the torsional and higher frequencies of a rotor blade significantly. The oscillatory blade loads show patterns consistent with the vertical center-of-gravity offset introduced by the tip. The surface strains reveal interesting higher-harmonic patterns of loading particularly near the dihedral junction.
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 25, 2023 |
Online Publication Date | Mar 31, 2023 |
Publication Date | Sep 30, 2023 |
Deposit Date | Mar 1, 2024 |
Journal | Journal of Aircraft |
Print ISSN | 0021-8669 |
Electronic ISSN | 1533-3868 |
Publisher | American Institute of Aeronautics and Astronautics |
Peer Reviewed | Peer Reviewed |
Volume | 60 |
Issue | 5 |
Pages | 1700-1711 |
DOI | https://doi.org/10.2514/1.c037321 |
Keywords | Aerospace Engineering |
Public URL | https://uwe-repository.worktribe.com/output/11753339 |
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