I want to do some calculations for two diesel engines drive a ship propeller through a gearbox. I want to know the speed reduction ratio, total inertia of the system, torque ratio, etc.
I know that the power delivered at the propeller which rotates at 150 rpm will be equal to the sum of power of the two engines running at 750 rpm.
P(load) = 2*p(eng)
T(laod) * 150 = 2*750*T(eng)
Is the speed reduction ratio is different from torque ratio ? is (2*750)/150 the correct reduction ratio ? or it is just 750/150 ?
Also, to model the shaft dynamics, i will use the following equation:
2*pi*Inertia of rotating parts*(dn/dt)= T(eng) - T(propeller) - T(friction)
The total system inertia at the shaft = inertia of propeller including entrained water + shaft + gearbox + engine inertia*(reduction ratio^2) ????
Many Thanks in advance
Your calculations are write, speed ratio: number of teeth on 1st gear *number of revolution of that gear = number of teeth on 2nd gear *number of revolution of 2nd gear
Torque ratio: Power is same i.e. Torque on first gear*angular velocity of the first gear= Torque on second gear*angular velocity of the second gear
Thank you Mr Patel for your kind reply and help.
So in my case speed ratio is 5 and torque ratio is 10 ?
I want to make a shredder machine using two shafts moving in the opposite direction and with different rpm. Can anyone help me how to determine the ratio of their RPMs? The feed is tea leaves.
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