Download : CALCULATIONS FOR FNR GEAR BOX AND CVT COMBINATION

Gear Reduction Selection

Power Requirements against:

 

Fr: Wheel Resistance

FL : Air resistance

Fs: Gradient resistance

Fa: Acceleration resistance

 

Wheel Resistance= Rolling resistance + Slip Resistance + Road Resistance

Tr: Brake Torque

 

Assumption taken

 

Unmade road coefficient of friction fr= .16

mass of vehicle being=Mf

 

CALCULATIONS

 

Fr=fr*Mf*g*Cosαst     where αst=30˚

 

Fr=0.16*200*9.81*Cos 30

Fr=280N

 

Total Load R=113kg(driver)+200kg (vehicle)

R=313*9.81=3070.50N

 

Static Resistance=µR

=0.65*3070.5=1995.84N

 

Vmax=60kmph

Wheel Radius r=221.875mm

= .221m

Air Resistance

 

FL:0.5ρCwAv2

Ρ=Air Density

Cw=Drag Coefficient

A=Area

V=velocity

 

FL =0.5*1.99*0.0315*(16.66)2

=0.52N

 

 

Gradient Resistance:

Fst=Mf*g *Sinαst

 

Putting the corresponding value

Fst=131.725N

 

Acceleration resistance:

Fa=m*a

=956N

Ftotal=2662.247

 

Power Required: Ftotal*v/(Nrpm*η)