초록 ▼

An ejection sequencing system used particularly in an ejection seat operation includes continuous sensing of both airspeed and altitude. The continuous airspeed sensing is accomplished by continuously measuring the airstream temperature and then determining the optimum instant for parachute deployme

An ejection sequencing system used particularly in an ejection seat operation includes continuous sensing of both airspeed and altitude. The continuous airspeed sensing is accomplished by continuously measuring the airstream temperature and then determining the optimum instant for parachute deployment from the measured temperature, thus making the deployment event temperature-responsive. When the sensed airspeed is within a predetermined acceptable limits, a first signal is generated. Continuous altitude sensing is accomplished by an aneroid barometer and when the sensed altitude is within predetermined acceptable limits, a second signal is generated. When these first and second signals are transmitted to the parachute container, they initiate parachute deployment. Redundant, failsafe system operation can be provided through the use of two or more interconnected airspeed sensing devices having fixed time delays for backup.

대표청구항 ▼

An ejection sequencing system for controlling the deployment of a recovery parachute from its container, said recovery parachute being connected to an ejected load, said system comprising: first means for continuously sensing pressure altitude and for generating a first signal when the pressure alti

An ejection sequencing system for controlling the deployment of a recovery parachute from its container, said recovery parachute being connected to an ejected load, said system comprising: first means for continuously sensing pressure altitude and for generating a first signal when the pressure altitude of the ejected load is less than a predetermined maximum amount; second means for continuously sensing the true airspeed of the ejected load in the airstream and for generating a second signal when the ejected load true airspeed is less than a predetermined maximum amount; and means responsive to said first and second signals for initiating deployment of the recovery parachute from its container; said second means including an airstream probe having an air inlet end, an air outlet end and a flow passage extending therebetween, said flow passage having a restricted portion therein; a first temperature sensing device disposed in said restricted portion of said flow passage for measuring the free-stream temperature of the airstream; a second temperature sensing device disposed between said restricted portion and said outlet end for measuring the ambient temperature of the airstream; means for determining the true airspeed of the ejected load from the difference between the ambient temperature and the free-stream temperature; and an interior housing for said second temperature sensing device disposed within said flow passage between said restricted portion and said outlet end, said interior housing being connected to said probe by vanes. An airspeed sensing system comprising probe means positionable in the airstream, said probe means having an air inlet end, an air inlet end and a flow passage extending therebetween, said flow passage having a restricted portion therein; and temperature sensing means for measuring the free-stream static and total temperatures, said temperature sensing means including computing means for solving the formula: V =109.5 √Tt -T where V is the true airspeed, Tt is the free-stream temperature and T is the ambient temperature, said temperature sensing means comprising a first temperature sensing device disposed within said restricted portion of said flow passage for measuring the free-stream temperature of the airstream; a second temperature sensing device disposed between said restricted portion and said outlet end for measuring the ambient temperature within said probe; and an interior housing for said second temperature sensing device disposed within said flow passage between said restricted portion and said outlet end, said interior housing being connected to said probe by vanes.