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  • Users: ameenbassam
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  1. ameenbassam

    Battery power calculation from its capacity

    @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 ...
  2. ameenbassam

    Battery power calculation from its capacity

    @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...
  3. ameenbassam

    Battery power calculation from its capacity

    @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...
  4. ameenbassam

    Battery power calculation from its capacity

    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...
  5. ameenbassam

    Twin input/ Single output gearbox calculation help

    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.
  6. ameenbassam

    Twin input/ Single output gearbox calculation help

    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...
  7. ameenbassam

    Twin input/ Single output gearbox calculation help

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

    Twin input/ Single output gearbox calculation help

    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) -...
  9. ameenbassam

    Twin input/ Single output gearbox calculation help

    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...
  10. ameenbassam

    DC motor modelling to drive a ship propeller

    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 ???
  11. ameenbassam

    DC motor modelling to drive a ship propeller

    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 ??
  12. ameenbassam

    DC motor modelling to drive a ship propeller

    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...

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