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Effects of Downwash When Measuring G...

Brinkman, Jacob Lane.

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Effects of Downwash When Measuring Gas Concentrations with UAV-Mounted Gas Sensors.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Effects of Downwash When Measuring Gas Concentrations with UAV-Mounted Gas Sensors./
Author:	Brinkman, Jacob Lane.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	134 p.
Notes:	Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
Contained By:	Dissertations Abstracts International85-01B.
Subject:	Engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30417267
ISBN:	9798379919849

Effects of Downwash When Measuring Gas Concentrations with UAV-Mounted Gas Sensors.
Brinkman, Jacob Lane.

Effects of Downwash When Measuring Gas Concentrations with UAV-Mounted Gas Sensors. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 134 p.

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

Thesis (Ph.D.)--Missouri University of Science and Technology, 2023.

This research concludes that the downwash region of a rotary-wing unmanned aerial vehicle (UAV) does not produce pressure variations substantial enough to cause significant changes in density-based gas concentration measurements. US regulations evaluate gas concentration as a function of gas density, and accurate concentration measurements are critical for protecting health and safety, which means evaluation of actual downwash effects on measured gas concentration is essential.During experimentation, the UAV was fixed to a stand in a sealed chamber filled with NOx (NO and NO2) of constant concentration. The UAV rotors ran at hovering speeds, and gas concentrations were measured at various locations around the UAV. NOx was chosen due to intended US regulations on surface mine blasting NOx emissions, though the results should be applicable to most emissions of interest that are monitored by a UAV system. All variables other than the presence of downwash were held constant or accounted for, so the only source of concentration variation would have been caused by pressure changes in the downwash region. No significant variations were observed, providing evidence that downwash pressure variations are not substantial enough to alter density-based gas concentration measurements.Numerous researchers have suggested that downwash may affect gas concentration measurements, though no researcher has previously isolated and defined the effect. This dissertation's findings allow researchers to safely assume this source of previously undefined error is statistically negligible, provided the UAV and gas sampling point are located entirely within the gas cloud and the downwash region has stabilized.

ISBN: 9798379919849Subjects--Topical Terms:

586835
Engineering.
Subjects--Index Terms:

NOx emissions

Effects of Downwash When Measuring Gas Concentrations with UAV-Mounted Gas Sensors.
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520 $a This research concludes that the downwash region of a rotary-wing unmanned aerial vehicle (UAV) does not produce pressure variations substantial enough to cause significant changes in density-based gas concentration measurements. US regulations evaluate gas concentration as a function of gas density, and accurate concentration measurements are critical for protecting health and safety, which means evaluation of actual downwash effects on measured gas concentration is essential.During experimentation, the UAV was fixed to a stand in a sealed chamber filled with NOx (NO and NO2) of constant concentration. The UAV rotors ran at hovering speeds, and gas concentrations were measured at various locations around the UAV. NOx was chosen due to intended US regulations on surface mine blasting NOx emissions, though the results should be applicable to most emissions of interest that are monitored by a UAV system. All variables other than the presence of downwash were held constant or accounted for, so the only source of concentration variation would have been caused by pressure changes in the downwash region. No significant variations were observed, providing evidence that downwash pressure variations are not substantial enough to alter density-based gas concentration measurements.Numerous researchers have suggested that downwash may affect gas concentration measurements, though no researcher has previously isolated and defined the effect. This dissertation's findings allow researchers to safely assume this source of previously undefined error is statistically negligible, provided the UAV and gas sampling point are located entirely within the gas cloud and the downwash region has stabilized.
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650 4 $a Automotive engineering. $3 2181195
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