Download Polyethylene Free Balloon Design From The Perspectives Of User And Designer full books in PDF, epub, and Kindle. Read online Polyethylene Free Balloon Design From The Perspectives Of User And Designer ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Those who use large polyethylene balloons for experimental programs are presented with background information on the processes of selecting and designing balloons to meet their respective mission requirements. The effects of payload weight, altitude, duration, and vertical control on both the total payload weight and the balloon size are discussed with respect to these processes. The need to define missions success in terms of realistic requirements is emphasized and a mission planning procedure is proposed. Assumptions and problems in contemporary balloon design are discussed, and design and analysis procedures based on the loads and geometry at the time of launch are developed. Dynamic launch shock is proposed as a criterion for shell thickness, and a model of polyethylene film modulus is developed to account for strain rate and stress and strain relaxation at a launch temperature of 23 degrees C. Computer codes have been written for the processes of balloon selection and balloon design to meet mission requirements. They are intended to be a basis for more efficient, interactive mission planning. Finally, improvements to the balloon design process are proposed and discussed.
Book Synopsis Polyethylene Free Balloon Design from the Perspectives of User and Designer by : James F. Dwyer
Download or read book Polyethylene Free Balloon Design from the Perspectives of User and Designer written by James F. Dwyer and published by . This book was released on 1982 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Those who use large polyethylene balloons for experimental programs are presented with background information on the processes of selecting and designing balloons to meet their respective mission requirements. The effects of payload weight, altitude, duration, and vertical control on both the total payload weight and the balloon size are discussed with respect to these processes. The need to define missions success in terms of realistic requirements is emphasized and a mission planning procedure is proposed. Assumptions and problems in contemporary balloon design are discussed, and design and analysis procedures based on the loads and geometry at the time of launch are developed. Dynamic launch shock is proposed as a criterion for shell thickness, and a model of polyethylene film modulus is developed to account for strain rate and stress and strain relaxation at a launch temperature of 23 degrees C. Computer codes have been written for the processes of balloon selection and balloon design to meet mission requirements. They are intended to be a basis for more efficient, interactive mission planning. Finally, improvements to the balloon design process are proposed and discussed.
The history of the development of free balloons to carry heavy payloads into the stratosphere is reviewed with the objective of developing a design based on existing technologies for a balloon to carry 9000 lb to 90,000 ft. Reinforced polyester balloons, in tandem balloon configurations, are discussed with respect to materials, design criteria, and performance. The problem of launch dynamics for single cell polyethylene balloons is also discussed and it is concluded that a capped single cell polyethylene balloon can be dynamically launched, successfully, with the 9000-lb payload. Further, it is concluded that the single cell polyethylene balloon is the best means to meet the objective. Specifications for such a balloon are provided.
Book Synopsis A Balloon Design for 9000 Pounds at 90,000 Feet by : James F. Dwyer
Download or read book A Balloon Design for 9000 Pounds at 90,000 Feet written by James F. Dwyer and published by . This book was released on 1983 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The history of the development of free balloons to carry heavy payloads into the stratosphere is reviewed with the objective of developing a design based on existing technologies for a balloon to carry 9000 lb to 90,000 ft. Reinforced polyester balloons, in tandem balloon configurations, are discussed with respect to materials, design criteria, and performance. The problem of launch dynamics for single cell polyethylene balloons is also discussed and it is concluded that a capped single cell polyethylene balloon can be dynamically launched, successfully, with the 9000-lb payload. Further, it is concluded that the single cell polyethylene balloon is the best means to meet the objective. Specifications for such a balloon are provided.
Download or read book Instrumentation Papers written by and published by . This book was released on 1982 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
This paper critiques existing aerodynamic-thermodynamic models for predicting the vertical motion of free balloon systems. It demonstrates that: a) the aerodynamic drag coefficient model should be based on Froude number and fractional volume as well as Reynolds number; b) there has been a widespread error in definition of the instantaneous mass of the balloon film involved in the heat transfer process; c) the gas bubble cannot be modelled as a sphere; d) the gas bubble is asymmetrical except when near or at its natural ceiling altitude; and e) the actual gas bubble shape, and most probably the added mass, is directly related to the type of gore pattern. Finally, a procedure is proposed for the analysis of actual flight data to enable the development of a practical, but also theoretically sound, model of the aerodynamic drag coefficient of a zero-pressure, free balloon- and subsequent refinement of the heat transfer models for direct and reflected solar energy.
Book Synopsis Factors Affecting the Vertical Motion of a Zero-pressure, Polyethylene, Free Balloon by : James F. Dwyer
Download or read book Factors Affecting the Vertical Motion of a Zero-pressure, Polyethylene, Free Balloon written by James F. Dwyer and published by . This book was released on 1985 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper critiques existing aerodynamic-thermodynamic models for predicting the vertical motion of free balloon systems. It demonstrates that: a) the aerodynamic drag coefficient model should be based on Froude number and fractional volume as well as Reynolds number; b) there has been a widespread error in definition of the instantaneous mass of the balloon film involved in the heat transfer process; c) the gas bubble cannot be modelled as a sphere; d) the gas bubble is asymmetrical except when near or at its natural ceiling altitude; and e) the actual gas bubble shape, and most probably the added mass, is directly related to the type of gore pattern. Finally, a procedure is proposed for the analysis of actual flight data to enable the development of a practical, but also theoretically sound, model of the aerodynamic drag coefficient of a zero-pressure, free balloon- and subsequent refinement of the heat transfer models for direct and reflected solar energy.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1988-08 with total page 1234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1983 with total page 1376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interference Problems on Wing-fuselage Combinations in Inviscid, Incompressible Flow by : Aeronautical Research Council (Great Britain)
Download or read book Interference Problems on Wing-fuselage Combinations in Inviscid, Incompressible Flow written by Aeronautical Research Council (Great Britain) and published by . This book was released on 1974 with total page 1212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index: Keyword A-L by :
Download or read book Government Reports Annual Index: Keyword A-L written by and published by . This book was released on 1983 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Announcing the new revised edition of the classic industry reference! Landscape Graphics is the architect’s ultimate guide to all the basic graphics techniques used in landscape design and landscape architecture. Progressing from the basics into more sophisticated techniques, this guide offers clear instruction on graphic language and the design process, the basics of drafting, lettering, freehand drawing and conceptual diagramming, perspective drawing, section elevations, and more. It also features carefully sequenced exercises, a complete file of graphic symbols for sections and perspectives, and a handy appendix of conversions and equivalents.
Book Synopsis Landscape Graphics by : Grant Reid
Download or read book Landscape Graphics written by Grant Reid and published by Watson-Guptill. This book was released on 2012-08-01 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Announcing the new revised edition of the classic industry reference! Landscape Graphics is the architect’s ultimate guide to all the basic graphics techniques used in landscape design and landscape architecture. Progressing from the basics into more sophisticated techniques, this guide offers clear instruction on graphic language and the design process, the basics of drafting, lettering, freehand drawing and conceptual diagramming, perspective drawing, section elevations, and more. It also features carefully sequenced exercises, a complete file of graphic symbols for sections and perspectives, and a handy appendix of conversions and equivalents.
