Vibration-based damage detection for a composite helicopter main rotor blade
نویسندگان
چکیده
منابع مشابه
Multiple-Surrogate Approach to Helicopter Rotor Blade Vibration Reduction
The advantages of usingmultiple surrogates for approximation and reduction of helicopter vibration are studied. Multiple approximation methods, including a weighted-average approach, are considered so that pitfalls associated with only using a single best surrogate for the rotor blade vibration-reduction problem are avoided. A vibration objective function corresponding to a flight condition in ...
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Introduction Rotor blade lllJunes are uncommon in the Armed Forces because of continual safety training and protection in relation to the use of helicopters. Rarely, accidents do still happen as a reminder that even with acute awareness of ground movements, incidents will occur. A review of the total United States Army rotor blade accidents between 1972 and 1991 reported 24 strike injuries, 12 ...
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The advantages of employing multiple approximation methods and the effectiveness of weighted average surrogate modeling for approximation and reduction of helicopter vibrations is studied. Multiple surrogates, including the weighted average approach, are considered so that the need to identify the “best” approximation method for the rotor vibration reduction problem is eliminated. Various appro...
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The compatibility between a composite beam cross-sectional analysis based on the variational asymptotic approach, and a helicopter rotor blade model which is part of a comprehensive rotorcraft analysis code is examined. It was found that the finite element cross-sectional analysis code VABS can be combined with a moderate deflection rotor blade model in spite of the differences between the form...
متن کاملUltrasonic Guided Wave Nondestructive Testing for Helicopter Rotor Blade
Ultrasonic guided waves are used to detect the delamination between skin and honeycomb of a composite helicopter rotor blade. Theoretical work is carried out for guided waves in the trailing edge of a rotor blade, which is a multilayer composite skin/NOMEX half space structure. The dispersion relation is obtained with the global matrix method. Theoretically driven experiments are conducted on a...
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ژورنال
عنوان ژورنال: Case Studies in Mechanical Systems and Signal Processing
سال: 2016
ISSN: 2351-9886
DOI: 10.1016/j.csmssp.2016.01.001