Recent content by Dcat

  1. D

    Earth as return path for power transmission line?

    Form what I remember there is no return in 3phase system only becouse at the both end of the line the Y star center is at the same potential 0 and is grounded, but only if the loading of the line is symmetric which is not always true. If you don't have a symmetric loading of the 3 phase, there...
  2. D

    Can Jet Engines Accelerate a Spacecraft in Empty Space?

    It s the momentum conservation (or motion quantity p=mv), and the same explanation why gun slide recoil. The mas of gas that the jet engine blow out, multiplied for its velocity, must be the same of the mass of the space ship, multiplied for the spaceship velocity. mv=MV You have two...
  3. D

    What Are the Dynamics and Stability of Forced Undamped Harmonic Oscillators?

    So you mean in resonance the oscillator can store/absorbe energy, while not in resonance, the oscillator is somewhat transparent to the input vibration ?
  4. D

    What Are the Dynamics and Stability of Forced Undamped Harmonic Oscillators?

    Really thankyou for the math solution. This is exactly what I was looking for (and I already plotted some examples)! I need it for evaluating a system without damping factor, or without vibration absorber, just a metal frame joined with bolts very fixed. (I have a lot of cases and a lot of...
  5. D

    What Are the Dynamics and Stability of Forced Undamped Harmonic Oscillators?

    Undamped Harmoni Oscillator differential equation: mx''=-kx (solution (to IC: x(0)=A, x'(0)=0) : x=Acos(wt) with w2=k/m) I need to find out the solution to the forced case with (Initial Condition zero): mx''+kx=F (with F=AFcos(wFt) ) evaluating with the transfer function. But I m not sure...
Back
Top