| 摘要 |
A variable K factor energy absorber for an aircraft arresting system has a movable control element which is moved into different positions to adjust the K factor. The movement of the control element is programmed during payout of the arresting system in accordance with the speed of the arrested aircraft. The speed is sensed by a pump driven by the arresting gear tape reel. The program is provided by a cam (also driven by the tape reel through a reduction gear). The control element is moved by a hydraulic drive actuated by an electrical shifting switch, which is triggered when the detected speed of the arrested aircraft exceeds the predetermined speed established by a cam during initial and final phases of payout. The control element is thereby moved from an initial low K to an intermediate K position during the initial phase of payout if the predetermined speed established by the cam is exceeded. During the final phase of payout, the switch shifts the control to the high K position if the predetermined speed is exceeded. The cam also causes the control element to be driven to a high K position at the end of payout if it is not already there. The hydraulic drive shifts from an initial high speed to low speed operation during the final phase of payout. Rewind is accomplished by actuating the drive system to set the control element in the low K position to minimize the required rewind force.
|
