Download or read book A Discussion of Parachute Inflation Theories written by Bryan W. Roberts and published by . This book was released on 1975 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last decades numerous attempts have been made to describe the inflation performance of aerodynamic decelerators. The most popular approaches of filling time and filling distance are based on two questionable assumptions. These assumptions relate to the form of a family of canopy profiles, and the volume flow into and from the canopy volume. More recently there has emerged new and important approaches to this basic problem. It will be shown how these newer methods can be used to predict the inflation shapes and the canopy pressure distribution as a function of time.
Download or read book A Contribution to Parachute Inflation Dynamics written by Bryan W. Roberts and published by . This book was released on 1968 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical model of the inflation process is presented. The resulting stress-displacement equations for the canopy and lines are solved in the steady state condition of uniform descent. Some comments are made on the form of the unsteady pressure distribution on an inflating canopy. A close connection between the parachute stress, displacement and pressure equations has been demonstrated. This relationship is fundamental to any inflation theory. A plastic film parachute is to be used to verify the theoretical work. The permanent set properties of the plastic are to be used to measure the maximum stress history in the inflating canopy. The plastic film parachute will be air-dropped at the conference.
Download or read book A Collection of Technical Papers written by and published by . This book was released on 1975 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dimensional Analysis of the Inflation Process of Parachute Canopies written by Saul Kaplun and published by . This book was released on 1951 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Observations on Parachute Scale Factors for Modeling Parachute Deployment and Steady State Performance written by William P. Ludtke and published by . This book was released on 1979 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: A New approach to the scaling of parachute performance is presented, based upon variables inherent in the inflation process such as weight, time, geometry, etc. Limitations of conventional scaling parameters such as Reynold's, Froude, and Mach numbers as applied to parachutes are discussed. Examples of parachute inflation and steady state performance are correlated with a scale factor designated as a Mass Ratio, which is the ratio of the system mass to a mass of atmosphere associated with the parachute size, inflation time, altitude and deployment velocity. For advanced opening shock analyses, the concept of variable mass ratio during canopy inflation is proposed, and the effects of partial canopy inflation at suspension line stretch are discussed. Although the solid cloth types of parachutes are primarily used as examples, the ideas of mass ratio, initial area, and analysis techniques are applicable to all types of parachutes. (Author).
Download or read book AIAA 81 1912 AIAA 81 1952 With omissions in numbering written by and published by . This book was released on 1981 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Parachute Stress Analysis During Inflation and at Steady State written by H. G. Heinrich and published by . This book was released on 1964 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Parachute Stress Analysis During Inflation and at Steady State written by H. G. Heinrich and published by . This book was released on 1969 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Parachute Inflation Process Wind tunnel Study written by Edwin Pounder and published by . This book was released on 1956 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents results of an experimental study of the parachute inflation process. The investigation was carried out in a low speed wind tunnel using small cloth models, and an analysis is presented which gives a basis for extrapolation of the data recorded to any reasonably low Mach number case. The drag of the parachutes and the shapes of the canopies during the inflation process are studied in considerable detail, and some qualitative studies of the flow fields are conducted. The principle variables studied are parachute type, velocity (dynamic pressure), and canopy porosity. The theoretical analysis develops a procedure by which full scale characteristics can be predicted from wind tunnel data, and several examples are computed to illustrate the technique.
Download or read book Parachute Stress Analysis During Inflation and at Steady State written by Helmut G. Heinrich and published by . This book was released on 1966 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book U S Government Research Reports written by and published by . This book was released on 1958 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Deployment and Inflation of Large Ribbon Parachutes written by D. F. McVey and published by . This book was released on 1973 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for predicting deployment and inflation of reefed ribbon parachutes is presented. The method is based on integration of axial and radial momentum equations developed in the paper. Axial and radial forces are assumed to be describable by drag and radial force coefficients. Computer solutions of the equations are compared to measured parachute loads and to parachute mouth and maximum diameters from tests of 23- and 76-ft diameter conical ribbon parachutes. Comparison of load histories indicated that snatch loads depend to a large extent on deployment bag design and packing influences. Computed loads and parachute size histories for the inflation process compared favorably with flight data. The concept of a radial force coefficient appears to have considerable merit as a means of computing inflation for most parachutes.
Download or read book Analytical Investigation of Parachute Inflation Time written by Richard Charles Cutshall and published by . This book was released on 1959 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1971 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronautical Engineering written by and published by . This book was released on 1971 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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)
Download or read book Stress Analysis of a Parachute During Inflation and at Steady State written by Helmut G. Heinrich and published by . This book was released on 1965 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1991 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt:
