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  1. kosheboy

    Wheel skidding due to braking

    Thanks Brian, you were spot on, It is simpler than I thought, FYI the brake torque info supplied was incorrect, but that's all sorted now Re. Imcjoek's comments. hay, sorry for asking, and for mixing my P's & Q's. I'm not designing by forum, there are hundreds of calcs in our design, just got a...
  2. kosheboy

    Wheel skidding due to braking

    Also we are assuming the full effect of the brakes are applied in an instant
  3. kosheboy

    Wheel skidding due to braking

    I would like to work out if my wheels are going to skid, but am a bit stuck We have wheel diameter = 460 Speed = 50kph, 13.9m\s Weight on wheel = 3600kg Effective braking force = 300Nm (worked out from brake radius & brake clamp force Cf of pads) CF wheel to rail = 0.5 Can any one help with...
  4. kosheboy

    Hydraulic accumulator & ram as supension

    Correction, Ment to type P1xV1/T1=P2xV2/T2
  5. kosheboy

    Hydraulic accumulator & ram as supension

    I agree, and now see the light, I am a novice (hydraulically), but I did a simple P1xV1xT1=P2xV2xT2, and then P2xV2=P3xV3, (based on only 40° temp increase), or though this is very basic, it indicated to me that the increase in gas pressure was enough to fully lift the truck by an extra 200psi...
  6. kosheboy

    Hydraulic accumulator & ram as supension

    Thanks all, We have a spread sheet running with lots of numbers in it already that is giving us, stroke, shaft size, volumes, balance pressures and oil flows etc.., I'll churn over all this info, and shoe horn some of it into the spread sheet, I think, It could be a real problem, but if we look...
  7. kosheboy

    Hydraulic accumulator & ram as supension

    Oh, and the Payload is constant (will not change)
  8. kosheboy

    Hydraulic accumulator & ram as supension

    it's a 13ton truck.! so it will drop a mm or so when people get in, we are going to plumb up a test rig to check if its a problem or not, My gut feeling is that it will be in the 10's of mm rise, but we will soon see, I'll keep you posted, In the mean time If anyone has formula for me to...
  9. kosheboy

    Hydraulic accumulator & ram as supension

    We dont mind if the ride height increases a bit, but I need to know it the increase is going to use up x% of my spear stroke, if it turns out that the increase is to much for the design to handle then, we will have to look at ride height control valves.. Brendon
  10. kosheboy

    Hydraulic accumulator & ram as supension

    Ok, we have come up with a hydraulic suspension system for HiRailed truck, the suspension is needed to allow for twist in the rail network, and for any bad joints in the rail I am struggling with one issue, that is thermal expansion of the gas and the affect this will have on ride height, and...

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