Accession Number : ADD017476

Title :   Energy Absorption Device For Shock Loading.

Descriptive Note : Patent, Filed 30 Jun 93, patented 28 Feb 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Howard, C D ; LaGrange, Donald E ; Beatty, David A ; Littman, David C

Report Date : 28 Feb 1995

Pagination or Media Count : 5

Abstract : A shock energy absorbing device provides shock protection for the riser line employed to attach an aerodynamic deceleration device to a primary body during deployment of the system into an airstream. During deployment, for example, by dropping an unopened parachute and attached load or by rocket delivery of the unopened parachute and attached load, the parachute is made to open at a desired altitude whereupon very large shock tension forces are generated which are applied to the line. In order to protect the line from failing under these forces and to reduce the requirement for a bulky, heavy line, a shock absorber is provided in the form of a block having one or more breakable web portions formed therein and through which the riser line is threaded. Upon deployment of the system into an airstream, the shock tension forces operate to fracture some or all of the breakable web portions thereby dissipating the shock energy generated during deployment and protecting the riser line from failure. (MM)

Descriptors :   *SHOCK ABSORBERS, *AERODYNAMIC FORCES, *PARACHUTES, *SUSPENSION DEVICES, *PATENTS, *ENERGY ABSORBERS, SHOCK WAVES, FRACTURE(MECHANICS), AERODYNAMIC DRAG, FAILURE(MECHANICS), DECELERATION

Subject Categories : Gliders and Parachutes
      Couplers, Fasteners, and Joints
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE