Static Loads
Wfs= Wc/L
Wrs= Wb/L
Wfs = Static weight on front axle
Wrs = Static weight on rear axle
Dynamic Loads
-
Grades (θ)
Wf = Wfs – Whθ/L
Wr = Wrs + Whθ/L
Wf = Dynamic weight on front axle
Wr = Dynamic weight on rear axle
-
Accelerating
Wf = Wfs – Whax/(Lgc)
Wr = Wrs + Whax/(Lgc)
ax = acceleration in X-direction
gc = acceleration of gravity
Acceleration relation
Fx = M.ax = Wax/gc
P = Fx.V
ax = Fx gc/W = Pgc/(VW)
ax / gc = P/(VW)
Acceleration is
- Proportional to power to weight ratio.
- Inversely proportional to speed.
- Efficiency in utilizing available power depends on
- Minimizing friction losses and
- Ability to keep engine at peak power.
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