ROV Stability Analysis: Calculating Time for System to Settle

In summary, the conversation discusses the stability of an ROV during flight. The participants consider using a pendulum as a model, taking into account torque, damping, and the angle between the pendulum and the ground. They also mention using a formula for a damped pendulum and determining the damping coefficient from a formula for drag force calculated using Solidworks. Further information is requested for a complete analysis.
  • #1
andesam
9
0
Hi.

Im designing an ROV and need to know it will be stabile during "flight".

I am considering the (imaginary) line between the center of flotation, CF, and center of mass, CM, as a pendulum. Where the tourqe around CF = -mgl*sin(theta). Theta being the angle between the pendulum and the direction of g (the ground).

Alsow, the pendulum is dampend. Tourqe = (ohmega^2)*konstant. Ohmega = rad/s, konstant is calculatet using computer CAD software. (Edit: I am not shure if ohmega skould be squared or not here. By definition, the damping ratio is not squared (Ff=-c*v), but for drag force, velocity is squared (Fd=K*v^2).

Now, how can i calculate the time needed for the system to settle (thetha = 0), given a initial angel and angular velocity? Anyting else i should calculate to determine system stability?

- Thanks
 
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  • #2
OK. so i have found a formula which describes a damped pendulum:

I*Theta''(t)+m*g*L*Theta(t)+Gamma*L^2*Theta'(t)=0

Assuming small variations in theta (-10 - 10 degrees) and that damping force is propotional to gamma.
I being the inertia (m*L^2) and Gamma the damping coff.

Now, i am wondering if its possible to determine Gamma. From the solidworks model i can calculate a formula for drag force (with respect to the water velocity), perpendiculary on to the vessle. Is it possible to calculate Gamma from this information?

(Please notify me if you need more information)

- Thanks
 

FAQ: ROV Stability Analysis: Calculating Time for System to Settle

What is ROV stability analysis?

ROV stability analysis is a process used to determine the stability of a remotely operated vehicle (ROV) in a given environment. This involves calculating the forces acting on the ROV and determining the time it takes for the system to settle into a stable position.

Why is ROV stability analysis important?

ROV stability analysis is important because it ensures the safe and efficient operation of the ROV. It allows us to understand the behavior of the ROV in different conditions and make necessary adjustments to maintain stability and control.

3. What factors are considered in ROV stability analysis?

There are several factors that are considered in ROV stability analysis, including the size and weight of the ROV, the buoyancy and drag forces, the current and wave conditions, and the placement of thrusters and other equipment on the ROV.

4. How is the time for the system to settle calculated?

The time for the system to settle is calculated by using the principles of fluid dynamics and Newton's laws of motion. This involves analyzing the forces acting on the ROV and using mathematical equations to determine the time it takes for the ROV to reach a stable position.

5. Can ROV stability analysis be done for any type of ROV?

Yes, ROV stability analysis can be done for any type of ROV, as long as the necessary information about the ROV and its environment is known. However, different types of ROVs may require different methods of analysis, and specialized software may be needed for more complex ROVs.

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