[PDF] A Parachute Recovery System Dynamic Analysis eBook
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Multi-stage parachute recovery systems are used for (1) aerial delivery systems, (2) escape of personnel from disabled aircraft and (3) recovery of spacecraft. Factors related to the dynamics of the payload-parachute system are very importamt in the optimum design of parachute recovery systems. A three-degree-of-freedom mathematical analysis is presented here giving the motion of a typical vehicle during recovery. This analytical method is a useful tool because it yields parachute loads for a variety of vehicle dynamic conditions and parachute configurations, and enables the designer to predict undesirable recovery attitudes.
The purpose of this manual is to provide recovery system engineers in government and industry with tools to evaluate, analyze, select, and design parachute recovery systems. These systems range from simple, one-parachute assemblies to multiple-parachute systems, and may include equipment for impact attenuation, flotation, location, retrieval, and disposition. All system aspects are discussed, including the need for parachute recovery, the selection of the most suitable recovery system concept, concept analysis, parachute performance, force and stress analysis, material selection, parachute assembly and component design, and manufacturing. Experienced recovery system engineers will find this publication useful as a technical reference book; recent college graduates will find it useful as a textbook for learning about parachutes and parachute recovery systems; and technicians with extensive practical experience will find it useful as an engineering textbook that includes a chapter on parachute- related aerodynamics. In this manual, emphasis is placed on aiding government employees in evaluating and supervising the design and application of parachute systems. The parachute recovery system uses aerodynamic drag to decelerate people and equipment moving in air from a higher velocity to a lower velocity and to a safe landing. This lower velocity is known as rate of descent, landing velocity, or impact velocity, and is determined by the following requirements: (1) landing personnel uninjured and ready for action, (2) landing equipment and air vehicles undamaged and ready for use or refurbishment, and (3) impacting ordnance at a preselected angle and velocity.
This document serves as the third revision of the USAF Parachute Handbook which was first published in 1951. The data and information represent the current state of the art relative to recovery system design and development. The initial chapters describe representative recovery applications, components, subsystems, material, manufacture and testing. The final chapters provide empirical data and analytical methods useful for predicting performance and presenting a definitive design of selected components into a reliable recovery system.
The objective of this report is to present the derivation and application of an analytical technique to quantitatively predict and measure the performance/stability of a tandem parachute Mid-Air Recovery System (MARS). In this system, a main parachute is used to control the rate of descent of the payload and a smaller parachute, tethered to the apex of this main chute, serves as an engagement target for the recovery aircraft. Significant parameters relevant to the position and stability of the engagement parachute are identified and quantified. Those parameters relevant to system stability, as viewed by the pilot of the retrieval aircraft, are combined into a single numerically valued stability factor. Sensitivity of the stability factor to variation of its components is assessed. The stability quantification technique is applied to flight test data from two different systems. On one system, the performance of gliding and nongliding main canopy configurations is analyzed and compared. For the other system, an estimation is made of the potential change in performance obtainable through conversion from a non-gliding to a gliding main parachute. Potential refinements of the stability quantification technique to improve its sensitivity are presented. (Author).
A complete reference text to airdrop recovery systems with self-inflating airbags, focusing on analysis, test data, and engineering practicalities Comprehensively covers the fundamental theories, design, matching, and analysis of airdrop recovery systems that include a parachute and self-inflating airbag system Gives step-by-step guidance to aid readers in analyzing and designing their own recovery systems Highlights advanced research programs in the field of airdrop recovery systems, such as simulation and optimization methods.
An analysis yielding six-degree-of-freedom equations of motion is presented for predicting the dynamic behavior of a general parachute-payload system. The parachute canopy and associated air-mass are approximated as a rigid body, and separate equations of motion are derived for the canopy and payload subject to the constraint of the risers and suspension lines. The analysis determines the forces and the response of various riser and suspension-line geometries subjected to large displacements, under the assumption that these lines are linearly elastic. The euqations are readily adaptable to computer solutions and should be of interest in analyzing the dynamic performance of lifting-parachute payload systems.