Hazardous Situations and Accidents Caused by Light and Medium Unmanned Free Balloon Flights

Hegyi, Norbert; Jósvai, János

doi:10.14513/actatechjaur.v13.n4.560

Cited by 2 publications

(8 citation statements)

References 2 publications

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“…For a safer payload outer shell a Polyurethane (PUR) flexible porous elastomer was chosen [4]. It must be added that protein-based biodegradable PUR foams might be also possible in future as an option.…”

Section: Design and Manufacturementioning

confidence: 99%

“…The new dodecahedron payload had a soft Smooth-On FlexFoam-iT! III Polyurethane foam (PUR foam) outer shell which was chosen in a previous work [4].…”

Section: Drop Test With the Complete Modelmentioning

confidence: 99%

“…In the development of light, unmanned balloons, which serve mostly scientific purposes, one major point is safety. A malfunction, namely the fall of a balloon, can cause directly hazardous situations, even lethal accidents [1]. Light unmanned free balloons usually have a radiosonde as payload.…”

Section: Introductionmentioning

confidence: 99%

“…The payload of balloons usually has a relatively high stiffness. As for the soft outer shell of the payload, a flexible polyurethane foam has been chosen with soft, flexible, heat insulating properties, described in our earlier work [4]. The inner frame structure has multiple roles.…”

Section: Introductionmentioning

confidence: 99%

“…2 It must also be mentioned that the outer part is usually hard, and it has a sharp form. These features can cause serious damage or injury at a collision [1], therefore our research aim is to provide possible forms and build-ups which in one hand secures the survival of the payload and on the other hand it also decreases the To achieve this goal, a proper combination of material and geometrical structure must be created by the use of pairwise comparison. The advantage of this method it that comparison of the factors is already adequate to draw optimal conclusions about the geometrical forms or the material.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Introduction of a Novel Structure for Light Unmanned Balloon’s Payload: A Comprehensive Hybrid Study

Hegyi,

Fekete,

Jósvai

2024

Preprint

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This article introduces a novel payload structure, which has been experimentally proven to have smaller impact force while the carried internal electronics remains intact. The study describes in details how materials and geometric structures were chosen based on information analysis. It is clarified how possible geometric structures and materials can be chosen to yield optimal efficiency. Finite element method simulations were carried out to investigate the mechanical properties of several geometric structures, which has led to the dodecahedron form. For the frame, Polylactic Acid were chosen as an optimal material. A low air pressure test for parts of the structure, and also the whole structure were carried out with successful results. Drop tests, with force measuring sensors and high speed videos, were carried out for measuring and comparing the maximal impact force of classical payloads and the novel one. Laboratory and real life tests demonstrated that the developed new structure is safer and it is applicable.

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Section: Design and Manufacturementioning

confidence: 99%

“…The new dodecahedron payload had a soft Smooth-On FlexFoam-iT! III Polyurethane foam (PUR foam) outer shell which was chosen in a previous work [4].…”

Section: Drop Test With the Complete Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Introduction of a Novel Structure for Light Unmanned Balloon’s Payload: A Comprehensive Hybrid Study

Hegyi,

Fekete,

Jósvai

2024

Preprint

View full text Add to dashboard Cite

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Introduction of a Novel Structure for a Light Unmanned Free Balloon’s Payload: A Comprehensive Hybrid Study

Hegyi,

Fekete,

Jósvai

2024

Sensors

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Payloads for light unmanned free balloons must meet several safety requirements such as being able to protect the inner electronics in order to extract scientific data and to reduce the chance of inflicting personal injury in case of an accidental fall. This article proposes a novel payload structure, which exhibits the form of a dodecahedron. The actual form was determined by carrying out theoretical drop tests on different polyhedrons using the finite element method (FEM). From the simulations, it could be deduced that the dodecahedron was the optimal choice, since the duration of the impact was longer, while the impact force was slightly lower. The payload was produced by additive technologies; therefore, after performing tensile tests on probable materials, PLA was selected as the optimal candidate. The theoretical results about the dodecahedron’s ability were validated by laboratory and real-life drop tests, where the new payload was subjected to 56% less impact force under a 78% longer collision time compared to a classic, rectangular cuboid design. Based on these tests, it was demonstrated that the new structure is safer and it is applicable.

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Hazardous Situations and Accidents Caused by Light and Medium Unmanned Free Balloon Flights

Cited by 2 publications

References 2 publications

Introduction of a Novel Structure for Light Unmanned Balloon’s Payload: A Comprehensive Hybrid Study

Introduction of a Novel Structure for Light Unmanned Balloon’s Payload: A Comprehensive Hybrid Study

Introduction of a Novel Structure for a Light Unmanned Free Balloon’s Payload: A Comprehensive Hybrid Study

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