Engineering Fundamentals of Balloons

Yajima, N.; Imamura, Takeshi; Izutsu, Naoki; Abe, Toyoo

doi:10.1007/978-0-387-09727-5_2

Cited by 6 publications

(11 citation statements)

References 6 publications

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“…The theoretical basis for the simulation tool that is capable of trajectory prediction and performance evaluation of balloons is discussed in this Section. The theoretical model description is based on [22,36,37].…”

Section: Theoretical Modelmentioning

confidence: 99%

“…, where M t is the total mass of the balloon system, C mass is the virtual mass coefficient and it is taken as 0.5 in this work [37]. M t is the total mass and can be written as: M t = m p + m b + m e + m g .…”

Section: Equations Of Motionmentioning

confidence: 99%

“…The balloon flight is affected by radiant thermal energy as indicated in Figure 2, which shows involved radiant heat fluxes. The heat transfer model used in this work is from [37]. While the balloon ascends, the gas is expanding and the energy flux impinging the balloon envelope is constantly changing.…”

Section: Envelope Temperaturementioning

confidence: 99%

“…α g is the solar absorptivity of the lifting gas, and r e is the solar reflectivity of the envelope. Next, in Equation ( 19), I 0 is the solar constant defined as a flux density measuring the mean solar radiation (solar irradiance) per unit area [37]. A e is the effective surface area.…”

Section: Envelope Temperaturementioning

confidence: 99%

“…Here, Nu a and Nu g denote the Nusselt numbers for the atmosphere and the lifting gas, respectively. More details for calculating the Nusselt numbers can be seen in [23,26,37].…”

Section: Envelope Temperaturementioning

confidence: 99%

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Balloon Design for Mars, Venus, and Titan Atmospheres

Garg

Kühn

2020

Applied Sciences

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This paper studies the specifications of balloons for the exploration of bodies with different atmospheric conditions. Three types of balloons, i.e., zero-pressure, super-pressure, and over-pressurized, with four different shapes, i.e., sphere, oblate, prolate, and airship, were analysed. First, the development of a simulation tool is described, which was used for analysing the behaviour of balloons for different exploration missions. Next, the developed software was verified by comparing its output with recorded data from a set of flights at the Esrange Space Center. Based on the simulation results, recommendations are given for different balloon types and shapes for operation on Mars, Venus, and Titan.

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Section: Theoretical Modelmentioning

confidence: 99%

Section: Equations Of Motionmentioning

confidence: 99%

Section: Envelope Temperaturementioning

confidence: 99%

Section: Envelope Temperaturementioning

confidence: 99%

“…Here, Nu a and Nu g denote the Nusselt numbers for the atmosphere and the lifting gas, respectively. More details for calculating the Nusselt numbers can be seen in [23,26,37].…”

Section: Envelope Temperaturementioning

confidence: 99%

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Balloon Design for Mars, Venus, and Titan Atmospheres

Garg

Kühn

2020

Applied Sciences

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Dynamics simulation of folding wing UAVs launched from a high-altitude balloon platform

Zhang

Yang

Cai

2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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It is a new application of the high-altitude balloon system to launch multiple small folding wing unmanned aerial vehicles (UAVs). Based on the design of the launching system, we conduct numerical simulations of the ejection process from the balloon platform and the subsequent UAV wing deployment with trajectory leveling operation. We use the Kane method to establish the dynamic model of the balloon launching platform in the inertial coordinate system (ICS). By introducing the degree of freedom of UAV sliding along the sliding track, we realize the dynamic simulation of eight UAV launching processes and obtain the instantaneous separated states. The folding wing UAV first deploys its wings after ejection, which has the coupling characteristics between structural deformation and attitude adjustment. It is regarded as a multi-rigid body connecting structure composed of the fuselage and four wings. We establish the dynamic simulation model by the Kane method in the UAV body coordinate system (BCS). The Radau pseudo-spectral method is used to calculate the flight trajectory of each UAV. This paper is an engineering application research and can provide a simulation reference for the launching test of the balloon-borne folding wing UAV program.

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