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  1. David Ren

    What is the ODE for a mass-spring-damper system with dynamic friction?

    I see, So if I understand correctly, the ODE would be: m*a + c*v + v/(abs(v))*m*g*mu + k*x = 0 And unlike the original ODE, it is unsolvable analytically. How is it solvable numerically? Does anyone know how I can use MATLAB numerical toolbox to solve it?
  2. David Ren

    What is the ODE for a mass-spring-damper system with dynamic friction?

    I know that the second order differential equation for a mass-spring-damper system, assuming some initial velocity and position and no external force is: m*a + c*v + k*x = 0 Where a is the second derivative of x, and v is the first derivative. Say I want to add dynamic friction to my system. I...
  3. David Ren

    What determains the steaty-state velocity of an open loop DC motor?

    Putting intuition aside, since inertia is the tendency of an object to resist change in its motion, it would imply that the higher the inertia the more the motor would resist the increase in speed. how does this not lower the final speed? Imagining the wagon setup you described, yes, i would...
  4. David Ren

    What determains the steaty-state velocity of an open loop DC motor?

    I have a Simulink model of an open-loop DC motor. I am trying to understand what parameters effect the final steady state angular velocity of the motor. From playing around with different values, it seems that: A. The input voltage, electric resistance, viscous resistance (damper) and torque...

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