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@IRstuff Thank you for your kind reply. I am agree with you that there is no sense in relating capacity to power and i am trying to contact with the author of this article. Regarding Table 3, it is written that continuous current at 0.5C and life cycle is measured at 0.3C. What i should use ...

@IRstuff Thank you for your kind reply. I read this article so many times trying to understand but it is written exactly as follows: '' charging power equals to discharging power with 30% capacity of battery and optimum power value is 20% capacity of the battery '' You can find it in...

@VE1BLL Thank you for your kind reply. How can I convert the capacity to power ?? If nominal current is 72 A. Then time for 30% of the capacity = 0.3*360/72 = 1.5 h and for 20% capacity is 1 hour. If I divide the energy of 30% capacity and 20% of the capacity over time of 1.5 hr and 1 hr, I have...

Hi There, In an article called 'An Energy Management System of a Fuel Cell/Battery Hybrid Boat', the author assumed values of charging, discharging, and optimum power of the battery as follows: charging, discharging, and optimum power values for battery (Poptchar, Poptdis, and PBATopt ), where...

Hi 3DDave I will use the mathematical equations into Matlab. So i need to know the speed ratio and torque ratio for this system which consists of two engines running one propeller through a twin input/single output gearbox.

Thank you all for the advices but this is an existing system and i just want to mathematically model it. What is the gear ratio for twin input/single output gearbox ??? is the gear ratio will be different from torque ratio ??? the total system inertia at the shaft should be = inertia of...

Hi MikeHalloran Thank you for your reply. This system is already existing and i am just trying to model and study it.

Hi Drawoh Thank you for your reply. what i am trying to do is mathematically model the shaft dynamics of this system which consists of two diesel engines driving a propeller through a gearbox. This equation should be used: 2*pi*Inertia of rotating parts*(dn/dt)= T(eng) - T(propeller) -...

I want to do some calculations for two diesel engines drive a ship propeller through a gearbox. I want to know the reduction ratio, total inertia of the system, torque ratio, etc. I know that the power delivered at the propeller which rotates at 151 rpm will be equal to the sum of power of the...

So @ Skogsgurra J and B in the last block are not only for the motor but for the load as well. am i right ? J total = J motor + propeller + shaft ???

Thank you for your kind reply. I can calculate load torque (propeller torque) but how will we take moment of inertia (J) of the propeller and the shaft into consideration ??

Hi There, I want to mathematically model a DC motor connected to a ship propeller through shaft but i am very confused because of the load torque. I am using the following block diagram to model my motor. Is the load torque is the propeller torque ?? or the motor torque should be equal to the...