An Overview of Advanced Concepts for Near Space Systems

Young, Marcus; Keith, Stephanie; Pancotti, Anthony

doi:10.2514/6.2009-4805

Cited by 70 publications

(33 citation statements)

References 12 publications

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“…Near-space is quantitatively defined as the range of earth altitudes from 20 km to 100 km, below which commercial aircraft can produce sufficient lift for steady flight and above which the atmosphere is rarefied enough for satellites to orbit with meaningful lifetimes [1]. There has been recent interest in near-space long duration vehicles motivated by the possibility of operating such vehicles with the relative benefits of both high-altitude aircrafts and low-altitude satellites [2].…”

Section: Introductionmentioning

confidence: 99%

Dynamics modeing and maneuverability analysis of a near-space earth observation platform

Yang

Xie

et al. 2011

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011

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Near-space autonomous airship represents a unique and promising platform for earth observation and surveillance that involve a long duration airborne presence. In this paper, a six-degrees-of-freedom dynamics model and maneuverability of a near-space earth observation platform are presented. First, the near-space earth observation platform is introduced, including the concept design, configuration, energy sources, propeller and payload. Second, reference frames and motion parameters of the platform are defined, and the kinematics equations describing the platform's dimensional motion are derived. The effects of gravity, buoyancy, added inertia, aerodynamics and thrust on the platform are incorporated into the dynamics analysis, and a dynamics model in vector form of the platform is derived based on Newton-Euler principle. Finally, a simulation program has been developed to implement the dynamics model and applied to analyze the maneuverability of the platform. It is hoped that this work is useful to support the evaluation of maneuverability and the development of control system for the near-space earth observation platform.

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Section: Introductionmentioning

confidence: 99%

Dynamics modeing and maneuverability analysis of a near-space earth observation platform

Yang

Xie

et al. 2011

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011

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“…As a kind of multifunctional material which protect communication, telemetry, guidance and other systems of near space vehicle, wave-transparent material is widely used in radio systems of launch vehicles, highspeed missiles, flying wings, unmanned aerial vehicles and other aircraft [1,2].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Constraint, Size and Aspect Ratio on Thermal Shock Resistance of ZNS Wave-Transparent Ceramic in its Actual Service

Cheng

et al. 2015

J. mech.

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The thermal shock resistance (TSR) of ZnS wave-transparent ceramic depends on not only the mechanical and thermal properties of materials, but also the aerodynamic heating, pneumatic pressure, external constraint, size, aspect ratio and other factors in its actual service process. The theoretical model was established by introducing the analytical solution of transient heat conduction problem of ZnS plate under aerodynamic heating into its thermal stress field model and the pneumatic pressure was introduced. The present work mainly focused on the influences of constraint, size and aspect ratio on the critical rupture temperature difference of ZnS plate subjected to aerodynamic heating and pneumatic pressure. The numerical simulation was also conducted to verify the theoretical model. The results show that the large heat transfer condition corresponds to the poor TSR unless the constraint is too strong; the square plate provides the better TSR in case of different pneumatic pressures; a reasonable side length according to the range of pneumatic pressure would lead to the better TSR.

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“…Near space is quantitatively defined as the range of earth altitudes from 20 km to 100 km, below which aerial aircraft is able to produce sufficient lift for steady flight, above which the atmosphere is rarefied enough for satellites to orbit with meaningful lifetimes (Young, 2009), and in which the space from 20 km to 50 km belongs to the stratospheric space. In the development of technologies in energy and material, the research of near space platforms comes to the front in recent years, which involves the hypersonic flight vehicle, the solar powered aircraft, the stratospheric airship and the stratospheric balloon.…”

Section: Introductionmentioning

confidence: 99%