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  • Author Author: phoenixcomm
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NexGen TPMS or Tire Pressure Monitoring System: The Gap

phoenixcomm

Ok this is more of a bather than a post. Buckle up the ride will not be smooth! The US National Highway Traffic Safety Administration (NHTSA) in April 8, 2005 said it should be on all cars by 2008 and now trucks.. ok thats cool. Commercial Aircraft have had them for years BC (Before Cars) .. But in between those 2 camps there is a huge Black Hole. Whatever  you wish to call the tires, ie: rubber, skins, sneakers, and others. Tires are the most ignored, or understood part of your plane.image

Your cars tires life is pretty easy compared to an aircraft tire. You could use your car's tires to take off.. But landing is a whole nother kettle of fish. You, that is your wheels hit the runway at 70 to 200  knots. Try this stunt with car tires and they will shred.  And then you most likely will die. Game over. No do overs. Why is this you ask? Well it has to do with several factors: strong centrifugal forces,  and Traction Waves. Every time you land your tires distort. The forces on a Boeing 747 is about 6,000G. This has to do with the weight of the plane and the speed that you touch down.. Even a light aircraft landing at 100kn you tires will take a wallop.

Analysis:  Ok now what do we need? Ok lets use a car's TPMS as a model.

  1. We need the sensor in the tire with a transponder.. The data that we need and would like to capture:
    • Tire Pressure.. most of the damage is to under inflation.
    • Tire Temperature..
    • Tire mounted accelerometers to generate X and Y This tell you the amount of defection in the tire.
  2. We need a rf receiver at 428Mhz to acquire the data
  3. We need a rf transmitter near each wheel sending 127Khz to be the initiator.
  4. The receiver should send data to the embedded microprocessor via a bus, ie. CAN, TCPIP  etc.
  5. The display system and master caution will receive its data from the embedded microprocessor via a bus.


Parents

  • I had some friends who worked at the Wright Patterson tire test center where they tested various aircraft tires for landing abuse.

     

    I had suggested that it would be easy to have the tires rotate at the airspeed with just a few modifications.  A moving tire would reduce the wear and tear on the tires by a considerable degree, but no body wanted to propose it as a solution.

     

    So I am not surprised that tire issues are still a problem in the aviation field.

     

    Car and truck tires suffer more from operator neglect than just about any other form of abuse.

    A low inflation value is usually a sign of more serious problem and I suspect that all the warning will do is have the people just put more air into the tire rather than doing a close examination for other problems.

     

    DAB

Comment

  • I had some friends who worked at the Wright Patterson tire test center where they tested various aircraft tires for landing abuse.

     

    I had suggested that it would be easy to have the tires rotate at the airspeed with just a few modifications.  A moving tire would reduce the wear and tear on the tires by a considerable degree, but no body wanted to propose it as a solution.

     

    So I am not surprised that tire issues are still a problem in the aviation field.

     

    Car and truck tires suffer more from operator neglect than just about any other form of abuse.

    A low inflation value is usually a sign of more serious problem and I suspect that all the warning will do is have the people just put more air into the tire rather than doing a close examination for other problems.

     

    DAB

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