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Author: Helmut G. Heinrich Publisher: ISBN: Category : Equations of motion Languages : en Pages : 14
Book Description
The study is concerned with identification of significant terms in the process of parachute inflation. For finite mass cases, the equations of motion for parachutes inflating in free air and in wind tunnel experiments are established and organized in view of the nonsteady terms of canopy size, systems velocity, included and apparent masses, and the time derivatives of these terms. Wind tunnel experiments are described, the results of which yield graphical and numerical time functions for the significant terms of the equation of motion and the force-time histories. The wind tunnel results are compared with full size test information and certain identities are shown. The significant terms are combined to functions unique for the test conditions and substituted in the equation of motion. Force-time functions so derived compare satisfactorily with measured force histories and the contributions of the individual terms to the instantaneous parachute force can be seen.
Author: Helmut G. Heinrich Publisher: ISBN: Category : Equations of motion Languages : en Pages : 14
Book Description
The study is concerned with identification of significant terms in the process of parachute inflation. For finite mass cases, the equations of motion for parachutes inflating in free air and in wind tunnel experiments are established and organized in view of the nonsteady terms of canopy size, systems velocity, included and apparent masses, and the time derivatives of these terms. Wind tunnel experiments are described, the results of which yield graphical and numerical time functions for the significant terms of the equation of motion and the force-time histories. The wind tunnel results are compared with full size test information and certain identities are shown. The significant terms are combined to functions unique for the test conditions and substituted in the equation of motion. Force-time functions so derived compare satisfactorily with measured force histories and the contributions of the individual terms to the instantaneous parachute force can be seen.
Author: Helmut G. Heinrich Publisher: ISBN: Category : Languages : en Pages : 80
Book Description
The equations of motion for parachutes inflating under finite mass conditions in a horizontal flow wind tunnel are established and organized in view of the nonsteady terms of canopy size, velocity, included and apparent masses, and the time derivatives of these terms. Wind-tunnel experiments with solid flat and ringslot parachutes are described, the results of which yield graphical and numerical time functions for the terms of the derived equation of motion. The wind-tunnel results are compared with full-size test information and certain identities are shown. The numerical functions are substituted in the equation of motion and force-time histories are calculated.
Author: Helmut G. Heinrich Publisher: ISBN: Category : Parachutes Languages : en Pages : 138
Book Description
The equation of motion for parachutes inflating under finite mass conditions in a horizontal flow wind tunnel is established and organized in view of the nonsteady terms of canopy size, velocity, included and apparent masses, and the time derivatives of these terms. Wind-tunnel experiments with solid flat and ringslot parachutes are described, the results of which yield graphical and numerical time functions for the terms of the equation of motion. In the test range under investigation, these functions appear to be unique. The wind-tunnel results are compared with fill-size test information and certain identities are shown. The numerical functions are substituted in the equation of motion and force-time histories are calculated. Calculated and measured forces agree fairly well, and the calculations show the contributions of the various terms to the total farachute force.
Author: Charles H. Whitlock Publisher: ISBN: Category : Parachutes Languages : en Pages : 30
Book Description
Exploratory wind-tunnel tests of the disk-gap-band and modified ringsail parachute configurations have been conducted at dynamic pressures between 0.24 and 7.07 lb/ft2 (11 and 339 N/m2). Both parachutes exhibited positive inflation characteristics over the range of the tests within technique limitations. The disk-gap-band configuration required less time and distance to inflate than the modified ringsail configuration did.
Author: H. D. Melzig Publisher: ISBN: Category : Parachutes Languages : en Pages : 78
Book Description
An experimental investigation and correlative analysis were conducted to determine the pressure distribution over the surface of parachute canopies during the period of inflation for the infinite mass case and to correlate pressure coefficients with inflating canopy shapes. Parachute canopy models of Circular Flat, 10% Extended Skirt, Ringslot, and Ribbon designs were tested under infinite mass conditions in a 9 x 12 ft low speed wind tunnel. External and internal pressure values were measured at various locations over the surface of the model canopies throughout the period of inflation, and generalized canopy profile shapes were obtined by means of photographic analysis.
Author: Stanley H. Scher Publisher: ISBN: Category : Drag (Aerodynamics) Languages : en Pages : 34
Book Description
An investigation has been conducted to determine the opening characteristics of several hemispherical parachutes and to study the influence of the parachute design variables on these opening characteristics. The effects of design variables on the drag and stability characteristics of the parachutes were also evaluated.
Author: Helmut G. Heinrich Publisher: ISBN: Category : Languages : en Pages : 57
Book Description
The characteristic times and opening forces were studied for various inflation aid configurations of a model T-10 parachute. Finite mass wind tunnel tests were conducted in the horizontal return wind tunnel at a snatch velocity of 70 fps with a suspended load of 1.1 lbs. Relative to results of the standard T-10 parachute, the percentage decrease in the characteristic time and the corresponding percentage increase in the peak force were presented for five centerline, three internal parachutes and two centerline-internal combinations.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 580
Book Description
A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA)
Author: Helmut G. Heinrich
Author: Helmut G. Heinrich
Author: Helmut G. Heinrich
Author: Helmut G. Heinrich
Author: Charles H. Whitlock
Author: H. D. Melzig
Author: Stanley H. Scher
Author: Helmut G. Heinrich
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