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TKPH rating calculation

  1. Dec 2, 2009 #1
    I've just started a research on the tyre of mining trucks and am a bit unsure on how to calculate the TKPH ratings.

    Say for this set of data from VIMS,

    GMW = 390 tons
    Payload = 245.1 tons
    Total cycle time = 15:29 minutes
    Total cycle distance = 6.8 km

    And that is one shift.

    So, mean tyre load = 390 + 245.1/2 = 512.55 tons
    AWSS = (6.8*1)/(15.5/60)

    TKPH rating = mean tyre load * AWSS > 13000 ton-kilometer per hour which is REALLY big.

    Can anyone see what I did wrong?
     
  2. jcsd
  3. Aug 15, 2011 #2
    Mean Tire Load=(tire load empty+tire load loaded)/2
    So GMW=390 thats vehicle loaded
    Payload=245.1 thats the load, SO Empty vehicle=390-245=145
    Then you have to obtain your vehicle information about weight disturibtion and number of wheels to get each tire load.
    Like for example--2 front tires and 4 rear tires with distribution......
    Empty Loaded
    Front% 55% 35%
    Rear% 45% 65%
    front 39.87 53.63 ---mean tire load .....46.75
    rear 16.31 63.37 ---mean tire load .....39.84


    AWSS=6.8/(15.5/60)=26.3226
    TKPH=MTL*AWSS
    front =46.75*26.3226 = 1230
    rear =39.84*26.3226 = 1048
    THATS TOO some high as distance=6.8 km and low time 15.5 for the whole cycle,and sure big payload 245.
    GOOD LUCK
     
  4. May 8, 2012 #3
    Mean Tire Load=(tire load empty+tire load loaded)/2
    So GMW=390 thats vehicle loaded

    THE BELOW PASTED TREAD, NEED CLARFICATION.
    ON LOADED CONDITION HOW IS THE LOAD DISCTRBUTION CALCULATED
    EG ( 390*65%)/4= 63.37 BUT ON THE FRONT
    (390*35%)/2=68.25,( IT HAS BEEN MENTIONED AS 53.63) HOW IT SI ARRIVED
    PLEASE CLARFY AS I HAVE TO WORK ON CERTAIN TKPH CALUALTION.

    CBC




    Payload=245.1 thats the load, SO Empty vehicle=390-245=145
    Then you have to obtain your vehicle information about weight disturibtion and number of wheels to get each tire load.
    Like for example--2 front tires and 4 rear tires with distribution......
    Empty Loaded
    Front% 55% 35%
    Rear% 45% 65%
    front 39.87 53.63 ---mean tire load .....46.75
    rear 16.31 63.37 ---mean tire load .....39.84


    AWSS=6.8/(15.5/60)=26.3226
    TKPH=MTL*AWSS
    front =46.75*26.3226 = 1230
     
  5. May 8, 2012 #4
    it is mistake, use the weight distribution% mentioned
     
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