ankush doc

Views:
 
Category: Entertainment
     
 

Presentation Description

No description available.

Comments

Presentation Transcript

PowerPoint Presentation:

SEMINAR REPORT ON EJECTION SEATS PRESENTED BY:- ANKUSH BADYAL ECE(B1),301/08 MODEL INSTITUTE OF ENGINEERING & TECHNOLOGY JAMMU

CONTENTS:

Introduction History Modes of ejection Electronic sequencer Rocket motor Bailing out Canopy scattering Pilot safety Precaution Drawback Conclusion CONTENTS

INTRODUCTION:

INTRODUCTION Emergency escape from aircraft has been of utmost importance Survival of crewmembers have been a major thrust of the entire safety program in the Air Force. Engineering sciences have made major contributions to individualizing the ejection seat operating mode to the specific circumstances of the ejection.

HISTORY:

HISTORY a. First took place in 1910 (Bungee-Assisted ecape from an aircraft). b. In 1916 Everard calthrop, inventor of parachutes, patented an ejector seat using compressed air. c. First aircraft was heinkel He 280 fighter which used compressed air.

PowerPoint Presentation:

d. Helmut schenk , first Person to escape with an enjector seat on 13 Jan 1942. e. In 1944 Heinkel He 162 featured a new type of ejection seat, fired by an explosive cartridge. f. Early seats used solid propellant charge, Later Rocket Propulsion began. g. F-102 Delta Dagger was the first aircraft with a rocket propulsion seat Ejection.

KEY DEVICE OF AN EJECTION SEAT :

KEY DEVICE OF AN EJECTION SEAT Catapult Rocket Trigger handle. Parachutes

EJECTION EVENTS :

EJECTION EVENTS Pre-Ejection Primary Acceleration Forces of Wind Blast Parachute Descent and landing

MODES OF EJECTION :

MODES OF EJECTION THERE ARE THREE POSSIBLE MODES OF EJECTION :- Mode 1 :- Low altitude, Low Speed (>463 kph />15,000 ft).

PowerPoint Presentation:

Mode 2 :- Low altitude, High Speed (<463 kph/>15,000 ft).

PowerPoint Presentation:

Mode 3 :- High altitude, Any Speed (15000ft).

Timing an ejection :

Timing an ejection 0 Second :- Pilot Pulls cord ; canopy is shattered, sending seat up rails. 0.15 Second :- Seat Clears ejection rails at 15m/s, rocket catapult ignites. 0.50 Second :- Seat has lifted to about 100 to 200 ft from ejection altitude. 0.52 Second :- Seat man separates motor fires, Crew members release his equipment 2.5 to 4 Second :- Main Parachute is Fully deployed.

PowerPoint Presentation:

ELECTRONIC SEAT SEQUENCER

The electronic seat sequencer controls the automatic functions of the seat after it has left the aircraft. When the ejection initiates, thermal batteries power up the sequencer. Seat-mounted sensors within the sequencer measure the flight conditions of speed and altitude as soon as the seat separates from the aircraft. :

The electronic seat sequencer controls the automatic functions of the seat after it has left the aircraft. When the ejection initiates, thermal batteries power up the sequencer . Seat-mounted sensors within the sequencer measure the flight conditions of speed and altitude as soon as the seat separates from the aircraft.

Within a few milliseconds,the seat and ports clear the aircraft. The environmental data is processed through the analog to digital circuits and MUXed to the triple redundant microprocessor circuits, which solve algorithms to determine the parameters (altitude and velocity) of this ejection. All of the recovery events are timed to within 1 millisecond. :

Within a few milliseconds,the seat and ports clear the aircraft. The environmental data is processed through the analog to digital circuits and MUXed to the triple redundant microprocessor circuits, which solve algorithms to determine the parameters (altitude and velocity) of this ejection . All of the recovery events are timed to within 1 millisecond .

PowerPoint Presentation:

UNDER SEAT ROCKET MOTOR

The under seat rocket motor is sealed unit and consists of a manifold (machined, drilled, and threaded to accept ten propellant tubes), a lateral thrust motor tube, a cartridge tube, and four efflux nozzles:

The under seat rocket motor is sealed unit and consists of a manifold (machined, drilled, and threaded to accept ten propellant tubes), a lateral thrust motor tube, a cartridge tube, and four efflux nozzles

PHYSICS OF EJECTING :

PHYSICS OF EJECTING Ejection is an violent sequence. Force exerted on person being ejected is by Newton’s 2 nd law of motion.

PowerPoint Presentation:

4. Newton’s 2 nd law of motion. F = MxA F = Force Exerted M = Mass of body + Mass of the seat A = Acceleration created by the catapult. Acceleration is measured in terms of G. 1G = 32 ft/s 2 or 9.8 m /s 2

BAILING OUT :

BAILING OUT Ejection takes Place within 4 seconds from the time the ejection handle is pulled. The exact amount of time depends on the seat modes and the crew members body weight. Ejects when ejection handle is pulled

CANOPY OR CEILING SCATTERING :

CANOPY OR CEILING SCATTERING

PILOT SAFETY :

PILOT SAFETY Purpose of an ejection seat is pilot survival not comfort. Pilot experiences force of 20 Gs. i.e. force = to 20 times his or her body weight, Which can cause severe injury and even death. Parachute is present for the safe landing.

Precaution only qualified operator should operate the ejection seat. The seat must be disarmed before removal from the aircraft. only authorized personnel may work on, remove or install ejection seat component. :

Precaution only qualified operator should operate the ejection seat. The seat must be disarmed before removal from the aircraft. only authorized personnel may work on, remove or install ejection seat component.

DRAWBACKS :

DRAWBACKS Cause Injury Ejection seat “G” force : spinal : compression fracture Impact with canopy structure :severe laceration :spinal fracture Wind blast : petechial hemmorage Parachute opening shock : cervical strain : vertebral dislocation fracture

CONCLUSION :

CONCLUSION Ejection Seats Aim at providing safe ejection for fighter Pilot

authorStream Live Help