Global Optimized Isothermal and Nonlinear Models of Earth’s Standard Atmosphere

Daidzic, Nihad E.

doi:10.15394/ijaaa.2015.1064

Cited by 4 publications

(10 citation statements)

References 24 publications

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“…We use the International Standard Atmosphere (ISA) for aircraft performance computations. Unlike several ISA's discrete-regions, the environmental NLPAM introduces smooth and continuous changes of atmospheric parameters following the ISA closely (Daidzic 2015b). ISOAM is used for the local cabin atmosphere.…”

Section: Atmospheric Modelsmentioning

confidence: 99%

“…The ISA consists of many discrete layers with discontinuous temperature lapse rates (TLRs), which complicates the computations (Daidzic 2015a). Instead, the NLPAM model of the ISA troposphere-stratosphere, recently developed by Daidzic (2015b), is used. In the NLPAM model, the temperature versus geopotential height H (in meters) is expressed with a smooth polynomial:…”

Section: Terrestrial Atmospherementioning

confidence: 99%

“…If the average height (about 237 m) of the terrestrial topography (Trenberth, Smith 2005) is neglected, then δ o = 1. The relationship between the geopotential H and the orthometric z altitudes, due to the spherical Earth Newtonian law of gravitation, is given in Daidzic (2015aDaidzic ( , 2015b. The difference between the geopotential and the orthometric (MSL) altitude for the troposphere and stratosphere are neglected (Daidzic 2015a(Daidzic , 2015b H , which is a bit steeper than in the NLPAM troposphere.…”

Section: Terrestrial Atmospherementioning

confidence: 99%

“…No re-pressurization was considered. Isothermal ISOAM and the nonlinear parabolic NLPAM environmental atmosphere models, developed by Daidzic (2015b), are used in decompression and ED dynamics. The aircraft considered here are high-subsonic transport-category (T-category) airplanes cruising in the 30,000-45,000 feet range (9-14 km), SST flying at about 60,000 ft (18 km), and future HST spaceplanes flying at altitudes of about 130,000 feet (40 km).…”

Section: Introductionmentioning

confidence: 99%

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An algebraic model of high-altitude aircraft decompression and emergency descent

Daidzic

2018

Aviation

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An emergency descent maneuver initiated by pilots shortly after the onset of the decompression recognition was developed for subsonic, supersonic and hypersonic cruisers. Among other findings, the times when a passenger cabin is exposed to altitudes above 25,000 and 40,000 ft and the maximum cabin altitude reached are estimated. An airplane descent aerodynamic model was incorporated for high-speed and low-speed high-drag emergency descents. Airplane cabin atmosphere is assumed to be isothermal. The environmental atmosphere is simulated using the NLPAM nonlinear atmospheric model valid up to 47 geopotential kilometers. Rapid and slow decompressions at several discrete cruising altitudes ranging from 12 to 40 km and varying pilot reaction times in initiating the emergency descent were simulated. The main motivation for this work was to estimate times and altitudes a cabin reaches during depressurization for various flight conditions. This model can be utilized in optimizing the emergency-descent piloting techniques, calculating oxygen supplies, evaluating aeromedical factors, estimating harmful exposures to low pressures, and for other important high-altitude aircraft operations.

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Section: Atmospheric Modelsmentioning

confidence: 99%

Section: Terrestrial Atmospherementioning

confidence: 99%

Section: Terrestrial Atmospherementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An algebraic model of high-altitude aircraft decompression and emergency descent

Daidzic

2018

Aviation

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“…We can define an arbitrary vertical temperature profile for linear troposphere as: (1) Geopotential (H) and orthometric (z) heights differ little for lower terrestrial atmosphere (Daidzic, 2015a(Daidzic, , 2015bIribrane and Godson, 1981). ALR (Γx) will depend on the nature of the thermodynamic process and air properties:…”

mentioning

confidence: 99%

On Atmospheric Lapse Rates

Daidzic¹

2019

IJAAA

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Global Optimized Isothermal and Nonlinear Models of Earth’s Standard Atmosphere

Cited by 4 publications

References 24 publications

An algebraic model of high-altitude aircraft decompression and emergency descent

An algebraic model of high-altitude aircraft decompression and emergency descent

On Atmospheric Lapse Rates

High-elevation equatorial catapult-launched RBCC SSTO spaceplane for economic manned access to LEO

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