Propellant Actuated Device for Parachute Deployment during Seat Ejection for an Aircraft Application

Abstract

Propellant Actuated Devices (PAD) are installed on various combat aircraft of Air Force and Naval bases to perform extremely important operations such as parachute deployment, harness and leg restrain, cable cutting, pullers, seat ejection, bomb release or fuel tanks etc. They are basically called as gas generators. Such devices produce the high temperature and pressure combustion gases on initiation and used to perform different operations. These cartridges are single-shot operating devices. The performance of such kind of PADs cannot be tested by non-destructive techniques. Hence, cartridges are designed to function with high reliability and stringent quality control checks at all levels during entire development cycle. The safety features required during handling, storage and transportation are built in the design of PAD. The cartridges are required to undergo different exhaustive design qualification tests to qualify design aspects. Total life of 6 years is assigned to cartridge after performance degradation study of the propellant which includes 2 years installed life. This paper explains about the development aspects of PAD, its use, function, testing and performance evaluation methodology in a suitable fabricated Velocity Test Rig (VTR). The maximum slug velocity is 121.14 m/s in hot condition and minimum slug velocity is 99.14 m/s in cold condition. The main objective of this paper is to device a novel method to measure actual slug velocity of the aircraft gun inside a cartridge using VTR and Doppler RADAR.

Shear Stress Distribution in Double-lap Adhesive Joints Reinforced with Nylon Fabric: Numerical Investigation

“…In numerous industrial applications (e.g., automotive [4], naval [5] and aerospace [6]), these characteristics are fundamental and therefore adhesive technology takes a preferential role over traditional joining methods, such as bolted or riveted joints [7][8][9]. Some of the most studied adhesive joints are singlelap (SLJ) and double-lap (DLJ) types [10][11][12]; both types are used to study adhesive shear joint behaviour [13].…”

Performance Assessment of Shockwaves of Chute Spillways in Large Dams

“…In 1998, they also investigated the effects of chute lateral wall convergence and chute floor slope on the rooster tail waves. ey suggested a method for reducing transverse waves and designing lateral walls of a chute [23,24]. In another study, investigations on this type of flow were presented as the standing wave analysis in a chute spillway [25,26].…”