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Experimental study of rotorcraft including modal testing (vibration test), rotor blade deformation measurement, and performance measurement (thrust, pitching moment, and power); Optical measurement techniques such as digital image correlation and particle images velocimetry; Extensive experience in design and fabrication of rotorcraft components from top to bottom with conceptual/detail design by Computer-aided design (CAD); Airload reconstruction from measured rotor blade deformation and modal parameters; Flight power modeling of VTOL aircraft for deep space exploration
January 2020 - March 2020
Honda Aircraft Company
June 2018 - August 2018
NASA Jet Propulsion Laboratory
- Summer Intern
Link to the full text (http://arc.aiaa.org/doi/abs/10.2514/1.C035469): In a closely spaced, coaxial counter-rotating (CCR) rotor, the passage of upper and lower rotor blades over each other results in transient loads and blade deformation. This paper describes the measurement and numerical modeling of these transient loads and blade deformations in...
"Link to the full text: (https://doi.org/10.1016/j.ymssp.2019.106265)": This study describes the deformation measurement and operational modal analysis (OMA) of an extremely flexible rotor blade in hover. Blade deformation of a 0.45 m-diameter two-bladed rotor was measured at two different root pitch angles and two rotational speeds up to 1500 RPM...
Flight power and energy requirement models were developed for Titan Aerial Daughtercraft (TAD) mission concepts, in which a small-scale (e.g. ≤ 10 kg) VTOL aircraft would conduct multiple sorties on Titan from a mothership (lander or balloon), recharging batteries from a radioisotope power source (RPS) on the mothership between sorties. The current...
The present study describes the measurement of transient blade deformation and rotor loads of a single-bladed, rigid, closely-spaced coaxial counter-rotating rotor (CCR) system in hover. Three-dimensional rotor blade deformations were measured using a time-resolved digital image correlation (DIC) technique, simultaneously with the rotor thrust and...
Hover testing was performed on a 2-m-diameter coaxial corotating (stacked) rotor system to investigate the effect of azimuthal spacing, or index angle, on performance. Individual rotor thrust and power measurements were performed as a function of the index angles. It was found that the contributions of individual rotors to the total stacked rotor p...
This study describes the measurement of transient hub loads and blade deformations due to blade passage in a 1×1-bladed, 2m-diameter rigid coaxial counter-rotating rotor system in hover. The experimental results were analyzed and evaluated in combination with a comprehensive analysis model using CAMRAD II. Lower rotor blade deformations were measur...
This study describes the deformation measurement and automated operational modal analysis (OMA) of a rotor blade in hover. Blade deformation of a 0.4 m-diameter two-bladed rotor was measured at two different root pitch angles and four rotational speeds up to 1500 RPM by a time-resolved digital image correlation technique (DIC). The DIC technique su...
This present study describes the deformation measurement and modal identification of an extremely flexible rotor blade in hover. Deformation measurement were performed on two-bladed rotors at four different root pitch angles and rotational speeds by means of a time-resolved digital image correlation technique (DIC). The rotor blade deformations wer...
Experiments were performed in hover on a 2 m diameter, isolated single rotor system, a coaxial counter-rotating rotor (CCR) system, and coaxial co-rotating (stacked) rotor system to quantitatively extract the swirl recovery of a CCR system. The performance comparison was based on induced power factors obtained from curve fits to momentum theory. Th...
A Mach-scale, rigid, counter-rotating coaxial rotor system, 80 inches in diameter and operating at a tip speed of 190 m/s was tested in hover in two configurations: two-bladed single rotor and two bladed counter-rotating coaxial rotor. Individual upper and lower rotor steady and vibratory hub loads were collected at four operating conditions for ea...
The main goal is to develop an analytical model to estimate flight power and energy required by the Titan Aerial Daughtercraft concepts and assess the feasibility and affordability of the whole mission with hybrid fixed/rotary-wing aircraft (with total mass up to 10 kg) for providing greater range with VTOL capability.
Deformation measurement and operational modal analysis (OMA) of an extremely flexible rotor blade in hover using a time-resolved digital image correlation (DIC) technique and the Complexity Pursuit (CP) algorithm