[PDF] Stress Analysis Of A Parachute During Inflation And At Steady State eBook

Author : Helmut G. Heinrich
Publisher :
Page : 58 pages
File Size : 34,64 MB
Release : 1966
Category : Aeroelasticity
ISBN :

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The stresses occurring in the cloth of a parachute during the period of inflation and at a steady state are calculated for a number of instantaneous shapes that are characteristic of the opening process and the steady state. The method is general and may be applied to any type of parachute built out of solid cloth, concentric rings, or ribbons. The presented analysis is related to canopies consisting of triangular gores but can be extended to other gore patterns. A numerical calculation is made for a solid flat circular parachute during the period of opening and at steady state.

Author : H. G. Heinrich
Publisher :
Page : 23 pages
File Size : 24,37 MB
Release : 1964
Category : Aeroelasticity
ISBN :

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The stresses occurring in the cloth of a parachute during the period of inflation and under steady state are calculated for a number of instantaneous shapes which are characteristic of the opening process and the steady state. The method is general and may be applied to any type of parachute built out of solid cloth, concentric rings or ribbons. The presented analysis is related to canopies consisting of triangular gores but can be extended to other gore patterns. A numerical calculation is made for a solid flat circular parachute during the period of opening and at steady state.

Author : Helmut G. Heinrich
Publisher :
Page : 62 pages
File Size : 42,14 MB
Release : 1965
Category : Parachutes
ISBN :

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The stresses occurring in the cloth of an opening parachute and at steady state are calculated. The method is based on assumed instantaneous and steady state shapes and related pressure distributions. It is general and may be applied to any type and size of canopy built out of solid cloth. The presented analysis is limited to canopies constructed of triangular gores, but can be extended to other gore patterns. A numerical calculation is made for the Solid Flat, Circular Parachute during the opening and at steady state.

Author : H. G. Heinrich
Publisher :
Page : 35 pages
File Size : 10,69 MB
Release : 1963
Category :
ISBN :

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The stresses occurring in the cloth of a parachute during the period of inflation and under steady state are calculated for a number of instantaneous shapes which are characteristic of the opening process and the steady state. The method is general and may be applied to any type of parachute built out of solid cloth, concentric rings or ribbons. The presented analysis is related to canopies consisting of triangular gores but can be extended to other gore patterns. A numerical calculation is made for a solid flat circular parachute during the period of opening and at steady state. (Author).

Author : H. G. Heinrich
Publisher :
Page : 76 pages
File Size : 48,42 MB
Release : 1969
Category : Aeroelasticity
ISBN :

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During the period from 1965 to 1969, two new methods for stress calculations have been proposed and general remarks primarily concerning the elasticity characteristics of a parachute cloth and pressure distribution have been made. The conservative way of performing a parachute stress snalysis consists of first establishing the geometry of the parachute canopy and then applying a certain pressure distribution. Subsequently, the pressure distribution has been linked to the instantaneous parachute force which can be obtained from an opening shock calculation. In this manner one can possibly obtain closed solutions with a minimum of empirical factors. An example of this approach is presented in detail in the following chapters.

Author : Helmut G. Heinrich
Publisher :
Page : 26 pages
File Size : 36,82 MB
Release : 1973
Category : Parachutes
ISBN :

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At the 4th Aerodynamic Deceleration Systems Conference, 1973, the development of the Omega Stress Sensor and initial canopy circumferential stress measurements were reported. Following the first success, the Omega sensor was tested under conditions of rapid loading. No dynamic effects were recorded at strain rates up to 100% per second. In the further pursuit of experimental stress analysis, initial measurements of radial canopy stress were made, and it was found that at certain locations the radial stress is as high or higher than the circumferential stress. Finally, exploratory tests were made in which circumferential stresses were measured on a 5 ft model parachute during the periods of inflation and at the following steady state. All tests were made under infinite mass conditions. The stresses were measured versus time, and their instantaneous values vary with respect to time and location on the parachute canopy.

Author : L. R. Jamison
Publisher :
Page : 174 pages
File Size : 19,68 MB
Release : 1965
Category : Aerodynamic load
ISBN :

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A stress analysis of the 70 ft Para-Sail during inflation and at steady state was performed under consideration of empirical parameters obtained in full size drop tests and from wind tunnel experiments. The calculations are related to a suspended weight of 4750 lbs, an initial and terminal speed of 310 fps and 30 fps, respectively. A reefing process is employed and the initial altitude is 10,600 ft above sea level.

Author : William L. Garrard
Publisher :
Page : 66 pages
File Size : 20,81 MB
Release : 1980
Category : Detectors
ISBN :

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This paper describes the results of an experimental study of canopy stresses in bias constructed solid flat parachutes. Stresses were measured in the warp and fill directions during inflation and at steady state for different values of dynamic pressure. Omega sensors were used to measure stress. These sensors were mounted along the gore center lines so that the warp and fill stress distributions could be determined as a function of distance from the vent. It was found that stresses in the fill direction were substantially larger than stresses in the warp direction.

Author : H. G. Heinrich
Publisher :
Page : 6 pages
File Size : 27,10 MB
Release : 1978
Category : Parachutes
ISBN :

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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.