2006-09-21 05:18:33 · 8 answers · asked by canard63 1 in Cars & Transportation ➔ Aircraft
One of the method:
The adaptive brake application and initial skid detection system allows rapid brake application and prevents deep initial skids. Brake pressure is compared with a predetermined threshold brake pressure. Wheel velocity error signals are also generated to indicated the difference between the wheel velocity and a reference velocity signal. A pressure bias modulator integrator responsive to brake pressure signals adjusts the wheel velocity error signals to provide an anti-skid control signal. The pressure bias modulator integrator can also be initialized to the value of the measured brake pressure when the wheel velocity error signals indicate the beginning of a skid. Brake pressure difference signals are generated to indicate the difference between brake pressure and a commanded brake pressure, and an adjusted brake pressure error signal is generated in response to the brake pressure difference signals.
2006-09-21 05:33:04 · answer #1 · answered by Mai N 3 · 0⤊ 1⤋
Inside each wheel is a small generator. The generator spins with the turning of the wheel. If the wheel stops turning then the signal from the generator is broken.
2006-09-23 03:48:39 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Mai_N is very technical about it, but in short, there is a tiny generator (wheel speed transducer) attached to the wheel so that when the wheel spins the generator turns and the frequency of the generator is related, sometimes a 1:1 ratio, to the speed of the wheel.
2006-09-21 14:01:56 · answer #3 · answered by Jerry L 6 · 2⤊ 0⤋
In the airplane I fly it simply compares the wheels rotation speed to each other. there are a number of logic events that go into it, (ie if your airspeed is >40 and you have weight on wheels but the wheels aren't spinning, your anti-skid is broken) but under normal condition it actuates when the slowest wheel's RPM drops to 30% of the fastest wheel's. When that wheel's rotation speed returns to 70% of the fastest wheel's, hydraulic pressure is reapplied.
2006-09-23 18:07:48 · answer #4 · answered by Jason 5 · 0⤊ 0⤋
Keep it simple. Sensors detect when a tire is in a skid and releases hydraulic pressure to the brake. It reapplies the pressure when the tire is no longer skidding. It all happens so rapidly that is feels like a light vibration in the brake pedals.
2006-09-21 13:08:59 · answer #5 · answered by RANDLE W 4 · 0⤊ 0⤋
An unregulated dc generator under the bearing cap.
One test we do is spin the generator with our fingers while applying the brakes. When we stop spinning it the brakes should release.
2006-09-21 20:33:17 · answer #6 · answered by Anonymous · 1⤊ 0⤋
Man this must be a hard question on the A&P exam. It seems to be asked everyday. Just study the darn book.
2006-09-21 21:27:43 · answer #7 · answered by Tegeras 4 · 0⤊ 0⤋
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2006-09-21 12:20:35 · answer #8 · answered by Anonymous · 0⤊ 0⤋