Study of Parachute Forces and Canopy Pressure Distribution Measured in a Subsonic Wind Tunnel Under Infinite Mass Conditions PDF Download
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Author: Helmut G. Heinrich Publisher: ISBN: Category : Parachutes Languages : en Pages : 147
Book Description
For the purpose of parachute canopy stress analysis during the period of inflation, the pressure distribution measured on a ring-slot parachute model is related to the instantaneous parachute force. The correlation of pressure and force data is based on test results established at the Deutsche Forschungsanstalt fuer Luft-und Raumfahrt (DFLR), Braunschweig, Germany. The final pressure-force-time relationship incorporate individual as well as averaged test data. A fair agreement could be shown between measured forces and those obtained from numerical integration of differential pressure over the canopy surface.
Author: Helmut G. Heinrich Publisher: ISBN: Category : Parachutes Languages : en Pages : 147
Book Description
For the purpose of parachute canopy stress analysis during the period of inflation, the pressure distribution measured on a ring-slot parachute model is related to the instantaneous parachute force. The correlation of pressure and force data is based on test results established at the Deutsche Forschungsanstalt fuer Luft-und Raumfahrt (DFLR), Braunschweig, Germany. The final pressure-force-time relationship incorporate individual as well as averaged test data. A fair agreement could be shown between measured forces and those obtained from numerical integration of differential pressure over the canopy surface.
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: H. D. Melzig Publisher: ISBN: Category : Parachutes Languages : en Pages : 141
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 10 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 obtained by means of photographic analysis. Pressure coefficients derived for the steady state (fully open canopy) are quite comparable to the results of previous measurements. Peak pressure values during the unsteady period of inflation were found to be up to 5 times as great as steady state values. The relationships between the pressure distribution and time for each of the canopy models deployed at free-stream velocities between 70 and 160 ft/sec. are presented.
Author: H. D. Melzig Publisher: ISBN: Category : Parachutes Languages : en Pages : 94
Book Description
An experimental investigation was conducted to determine the differential pressure distribution over the surface of parachute canopies during the period of inflation under mass conditions. Full scale parachute canopies of the circular flat, 10% extended skirt, ringslot and ribbon types were utilized during the free-flight test program, and differential pressures on the gore centerline and on the cord line were measured by means of four pressure transducers distributed over the canopy in equal distances from the skirt to the vent. In order to analyze the relationships and dependencies between the pressure distribution, projected canopy area, canopy shape, generated force, and dynamic pressure, graphical displays of these quantities were made as a function of time for each type of parachute canopy. The results of the pressure distribution measurements permit a better understanding of the physical nature of the dynamic process of parachute inflation. The stress distribution in a parachute canopy can be calculated if the corresponding canopy shape is known. For this purpose, the evolvement of the canopy shape with the corresponding time is presented for each of the canopy types. (Author).
Author: William B. Pepper Publisher: ISBN: Category : Aerodynamic load Languages : en Pages : 8
Book Description
Pressure distribution data for solid and ribbon parachutes are presented. Three-foot diameter model parachutes of 0, 10, 15, 20, 25, 30, and 40 percent geometric porosity were tested. Suspension line lengths of 1.0, 1.5, and 2.0 constructed diameters were used. Reefing line lengths of 19, 38, and 57-in. were tested. Two 7 x 10-ft, wind tunnels were used to test over a range of dynamic pressure from 35 to 600 lb/ft2. Integration of the measured pressures over the inflated canopy profiles generally resulted in drag force values which agree within 10 percent of force balance drag data.
Author: H. G. Heinrich Publisher: ISBN: Category : Parachutes Languages : en Pages : 6
Book Description
Circumferential stresses were measured on 5-ft flat circular block-constructed solid cloth and ring slot parachutes in a wind tunnel during inflation under infinite mass condition and at steady state. Five Omega sensors placed along gore centerlines and a force link measured stresses and the parachute force versus time. Radial stresses were measured on a 3-ft solid flat circular block-constructed parachute at steady state. Stress measurements were evaluated in view of maximum and steady-state stresses versus location and time, as well as in respect to the parachute force. The measurements indicated strong stress variations, being different for both types of parachutes. In the 3-ft solid cloth parachute, the radial stress was, at certain locations, greater than the circumferential stress.
Author: Helmut G. Heinrich
Author: Helmut G. Heinrich
Author: H. D. Melzig
Author: H. D. Melzig
Author: 
Author: H. D. Melzig
Author: 
Author: Kenneth Kenichiro Muramoto
Author: William B. Pepper
Author: H. G. Heinrich
Author: Earl C. Myers