All Outputs (6)

Structural design and aeromechanical analysis of unconventional blades for future mars rotorcraft (2023)
Journal Article
Lumba, R., Chi, C., Datta, A., Koning, W., Perez, N. P., & Cummings, H. (2023). Structural design and aeromechanical analysis of unconventional blades for future mars rotorcraft. Journal of the American Helicopter Society, 68(4), 42003-42018. https://doi.org/10.4050/JAHS.68.042003

The structural design of rotor blades with ultra-thin, unconventional airfoils is conducted in support of the NASA Rotor Optimization for the Advancement of Mars eXploration (ROAMX) project. The outer mold line was provided by NASA, and the internal... Read More about Structural design and aeromechanical analysis of unconventional blades for future mars rotorcraft.

Vacuum and hover tests of a dihedral–anhedral tip composite rotor (2023)
Journal Article
Chi, C., Datta, A., & Panda, B. (2023). Vacuum and hover tests of a dihedral–anhedral tip composite rotor. Journal of Aircraft, 60(5), 1700-1711. https://doi.org/10.2514/1.c037321

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... Read More about Vacuum and hover tests of a dihedral–anhedral tip composite rotor.

Aeromechanical analysis of a next-generation Mars Hexacopter rotor (2022)
Journal Article
Chi, C., Lumba, R., Jung, Y. S., & Datta, A. (2022). Aeromechanical analysis of a next-generation Mars Hexacopter rotor. Journal of Aircraft, 59(6), 1463-1477. https://doi.org/10.2514/1.C036739

A three-dimensional (3D) aeromechanical analysis is carried out on the rotor blades of a 20 kg conceptual Mars Hexacopter. The objectives are to understand the aeroelastic behavior of its unique ultrathin low-Reynolds-number and high-Mach-number blad... Read More about Aeromechanical analysis of a next-generation Mars Hexacopter rotor.

Three-dimensional strains on twisted and swept composite rotor blades in vacuum (2020)
Journal Article
Chi, C., Datta, A., Chopra, I., & Chen, R. (2021). Three-dimensional strains on twisted and swept composite rotor blades in vacuum. Journal of Aircraft, 58(1), 1-16. https://doi.org/10.2514/1.C035746

This paper presents an investigation of the effects of tip sweep on highly twisted composite rotor blades by acquiring strain data in vacuum. Three parametric test cases were designed for strain measurements, and predictions from a special three-dime... Read More about Three-dimensional strains on twisted and swept composite rotor blades in vacuum.

Mars science helicopter conceptual design (2020)
Report
Johnson, W., Withrow-Maser, S., Young, L., Malpica, C., Koning, W. J., Kuang, W., …Grip, H. F. (2020). Mars science helicopter conceptual design. NASA

Robotic planetary aerial vehicles increase the range of terrain that can be examined, compared to traditional landers and rovers, and have more near-surface capability than orbiters. Aerial mobility is a promising possibility for planetary explorati... Read More about Mars science helicopter conceptual design.

Analysis of low-speed height-velocity diagram of a variable-speed-rotor helicopter in one-engine-failure (2019)
Journal Article
Chi, C., Yan, X., Chen, R., & Li, P. (2019). Analysis of low-speed height-velocity diagram of a variable-speed-rotor helicopter in one-engine-failure. Aerospace Science and Technology, 91, 310-320. https://doi.org/10.1016/j.ast.2019.05.003

This work analyzes the effects of variable operating rotor speed on the helicopter low-speed Height–Velocity (H-V) diagram in one engine inoperative (OEI) situation. Using the UH-60A helicopter as baseline helicopter, a flight dynamics model and the... Read More about Analysis of low-speed height-velocity diagram of a variable-speed-rotor helicopter in one-engine-failure.