Experimental study of the effect of blade curvature and aspect ratio on the performance of a rotary-wing decelerator

Martiarena, Juan Francisco; Mora, Vicente Nadal; Piechocki, Joaquín

doi:10.1016/j.ast.2015.04.002

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…In the present study, the flight and rotation speed of SIV are chosen to be approximately 20-80 m s −1 , 20-40 r/s, respectively, which are higher than those for decelerators with parachutes (≈10 m s −1 , 4 r/s [1,38]) or wings (≈20 m s −1 and 12 r/s [2,13,14,[39][40][41][42][43]). However, compared with aviation vehicles, (e.g., rockets, missiles, airplanes, etc) that rely on rotation and fins to achieve a stable flight [44], the flight speed and rotation speed of SIV are much lower.…”

Section: The Force Acting On Sivmentioning

confidence: 99%

Dynamic analysis of a skeet-inspired vehicle to achieve a spiral scanning detection motion

Yang,

Ding,

Sun

2024

Phys. Scr.

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A short cylindrical vehicle (the ratio of length to diameter is less than 2) equipped with an outer/inner detector is developed, which is inspired by the Tennis racket theorem and Olympic skeet shooting sports to achieve a regular scanning spiral on the ground. The sensitivity of the asymmetric mass distribution of the skeet-inspired vehicle (SIV) to the spatial position of the inertial principal axis is evaluated. Subsequently, a dynamics model with six degrees of freedom for the SIV at a large initial angle of attack (≈60–90°) is established. The numerical results of solving the dynamic differential equations indicate that the special initial conditions—namely, high initial flying velocity and rotational speed—are prerequisites for achieving the regular scanning spiral. Additionally, the analysis demonstrates that asymmetric mass distribution, rather than asymmetric aerodynamics, serves as the key factor in achieving the regular scanning spiral in the present skeet-inspired vehicle. Our new strategy, using the principal axes as the initial rotation axis, offers better scanning performance (such as a larger detection area, faster scan frequency, and more stable scanning motion) compared to the other platforms (e.g., rotating decelerators with wings or parachutes) that rely on asymmetrical aerodynamics. The analyses can provide guidance for the structural design of various types of spiral scanning vehicles.

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Section: The Force Acting On Sivmentioning

confidence: 99%

Dynamic analysis of a skeet-inspired vehicle to achieve a spiral scanning detection motion

Yang,

Ding,

Sun

2024

Phys. Scr.

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“…Nadal-Mora and Sanz-Andr es (2006) obtained the stability range of pararotors via equations of motion, and Piechocki et al (2008) developed an analytical model and analyzed the stability of a type of pararotor whose blade is aligned with the mass center of the whole system. Additionally, in Piechocki et al (2014Piechocki et al ( , 2016, parameters such as displacement of mass center affecting their dynamic behavior were examined, and in Francisco-Martiarena et al (2015), the influence of aspect ratio on their performance was shown experimentally. Kellas (2007) designed, constructed and controlled a singlebladed vehicle deploying no motors in the auto-rotating phase.…”

Section: Introductionmentioning

confidence: 99%

An analytical solution and stability analysis of asymmetric non-actuator guided projectiles

Taban,

Novinzadeh

2024

AEAT

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Purpose One of the challenges encountered in the design of guided projectiles is their prohibitive cost. To diminish it, an appropriate avenue many researchers have explored is the use of the non-actuator method for guiding the projectile to the target. In this method, biologically inspired by the flying concept of the single-winged seed, for instance, that of maple and ash trees, the projectile undergoes a helical motion to scan the region and meet the target in the descent phase. Indeed, the projectile is a decelerator device based on the autorotation flight while it attempts to resemble the seed’s motion using two wings of different spans. There exists a wealth of studies on the stability of the decelerators (e.g. the mono-wing, samara and pararotor), but all of them have assumed the body (exclusive of the wing) to be symmetric and paid no particular attention to the scanning quality of the region. In practice, however, the non-actuator-guided projectiles are asymmetric owing to the presence of detection sensors. This paper aims to present an analytical solution for stability analysis of asymmetric decelerators and apprise the effects of design parameters to improve the scanning quality. Design/methodology/approach The approach of this study is to develop a theoretical model consisting of Euler equations and apply a set of non-dimensionalized equations to reduce the number of involved parameters. The obtained governing equations are readily applicable to other decelerator devices, such as the mono-wing, samara and pararotor. Findings The results show that the stability of the body can be preserved under certain conditions. Moreover, pertinent conclusions are outlined on the sensitivity of flight behavior to the variation of design parameters. Originality/value The analytical solution and sensitivity analysis presented here can efficiently reduce the design cost of the asymmetric decelerator.

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“…Inflatable heat shields use flexible air-tight chambers that are folded before inflation, then deploy and rigidise under internal gas pressure. Flexible thermal protection layers based on commercial materials are wrapped onto the chambers to maintain an acceptable structural temperature [11,12,13,14,15,16,17,18,19,20,21,22,23]. The foldable mechanisms utilise umbrella-like designs where a skirt made of flexible thermal protection materials is bounded onto rigid deployable ribs.…”

Section: Introductionmentioning

confidence: 99%

Deployable self-regulating centrifugally-stiffened decelerator (DESCENT): Design scalability and low altitude drop test

Roberts

et al. 2021

Aerospace Science and Technology

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Experimental study of the effect of blade curvature and aspect ratio on the performance of a rotary-wing decelerator

Cited by 6 publications

References 12 publications

Dynamic analysis of a skeet-inspired vehicle to achieve a spiral scanning detection motion

Dynamic analysis of a skeet-inspired vehicle to achieve a spiral scanning detection motion

An analytical solution and stability analysis of asymmetric non-actuator guided projectiles

Deployable self-regulating centrifugally-stiffened decelerator (DESCENT): Design scalability and low altitude drop test

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