Controlled energy absorption of seats for impact
Controlled energy absorption of seats for impact is described herein. One disclosed example method includes determining a weight of an occupant of a seat of an aircraft, and calculating, using a processor, a stroke load of a seat energy absorber operatively coupled to the seat based on the weight of the occupant. The example method also includes setting the seat energy absorber to the calculated stroke load.
1. A method comprising:
determining, via a sensor, a weight of an occupant of a seat;
calculating, using a processor, a height of the occupant based on an adjustment of a seat position by the occupant;
predicting, using the processor, that an impact will occur;
calculating, using the processor, impact conditions of the predicted impact;
calculating, using the processor, a stroke load of a seat energy absorber operatively coupled to the seat based on the weight of the occupant, the height of the occupant and the impact conditions; and
setting the seat energy absorber to the calculated stroke load prior to the impact.
2. The method as defined in claim 1 , further including determining an available stroke of the seat, and wherein calculating the stroke load is further based on the available stroke.
3. The method as defined in claim 2 , wherein the available stroke is determined based on an optical sensor.
4. The method as defined in claim 1 , wherein setting the energy seat absorber includes adjusting, via an actuator, a length of the energy seat absorber.
5. The method as defined in claim 1 , wherein the sensor is a first sensor, and further including a second sensor to detect an external condition of a vehicle in which the seat is disposed.
6. The method of claim 1 , wherein the height of the occupant is calculated based on measurements from an optical sensor operatively coupled to the seat.
7. The method as defined in claim 1 , wherein calculating the stroke load is further based on one or more of:
terrain topography;
velocity;
acceleration;
altitude; and
weight.
8. The method as defined in claim 1 , wherein the weight is determined by a load cell.
9. The method of claim 1 , wherein calculating the impact conditions is based on terrain topography.
10. A tangible machine readable medium having instructions stored thereon, which when executed, cause a processor of a seat controller of a seat to:
receive a weight of an occupant from a weight sensor of the seat;
calculate a height of the occupant based on an adjustment of a seat position by the occupant;
predict that an impact will occur based on a sensor that detects external conditions of a vehicle in which the seat is disposed; and
calculate predicted impact conditions of the impact and a stroke load of an energy absorber operatively coupled to the seat based on the received weight, the calculated height and the predicted impact conditions.
11. The machine readable medium having instructions stored thereon as defined in claim 10 , which when executed, further cause the processor to receive a relative position of a bucket of the seat from a position sensor mounted to the seat, wherein the stroke load is calculated further based on the relative position of the bucket.
12. The machine readable medium having instructions stored thereon as defined in claim 10 , which when executed, further cause the processor to set the energy absorber to the calculated stroke load prior to the impact.
13. The machine readable medium having instructions stored thereon as defined in claim 12 , wherein the predicted impact conditions are calculated based on:
terrain topography;
velocity;
acceleration;
altitude; and
weight.