- #1
Fluidman117
- 34
- 0
Hi,
I am designing a wave energy converter, which has one degree of freedom - heaving motion. Meaning it will move only in vertical direction.
My system can be considered as a Mass Spring Damper system.
Thus my equation of motion is:
F=Fh+Fe
Where,
Fe= Excitation force (Wave force)
F=m*a (mass times acceleration)
Fh= -m(a)*a - b(hyd)*v - k*x (hydromechanical load)
m(a) - added mass
b(hyd) - damping coefficient
v - velocity
k - spring coefficient
x - distance
However, I also want to add a power extracting device to my system, which can be considered a generator. I have read many papers and they usually add a external damping force to enable power extraction.
Fb(ext)=-b(ext)*v
Thus my new equation of motion would be:
F=Fh+Fb(ext)+Fe
And finally my question. I would like to understand the physical meaning behind the external damping force. Does it mean that it is just a resistance (load) applied to the system to enable power extraction?
I am designing a wave energy converter, which has one degree of freedom - heaving motion. Meaning it will move only in vertical direction.
My system can be considered as a Mass Spring Damper system.
Thus my equation of motion is:
F=Fh+Fe
Where,
Fe= Excitation force (Wave force)
F=m*a (mass times acceleration)
Fh= -m(a)*a - b(hyd)*v - k*x (hydromechanical load)
m(a) - added mass
b(hyd) - damping coefficient
v - velocity
k - spring coefficient
x - distance
However, I also want to add a power extracting device to my system, which can be considered a generator. I have read many papers and they usually add a external damping force to enable power extraction.
Fb(ext)=-b(ext)*v
Thus my new equation of motion would be:
F=Fh+Fb(ext)+Fe
And finally my question. I would like to understand the physical meaning behind the external damping force. Does it mean that it is just a resistance (load) applied to the system to enable power extraction?