- #1
emosier
- 2
- 0
Hi all,
Mechanical engineer needing some electrical help. So electrically piezo actuators are modeled as capacitors.
Power(P) = C*U*dU/dt, where U equals voltage.
I'm seeing several sites like here: http://www.piezo.ws/piezoelectric_actuator_tutorial/Piezo_Design_part3.php
They say for sinusoidal operation Pavg ≈ C*U^2*f and Pmax ≈ ∏*C*U^2*f (assuming you start from 0 Volts).
So my questions are:
1. How can you substitute U*f for dU/dt to get average power from the main power equation?
2. How is Pmax ≈ ∏*Pavg?
3. What does average power mean for a cycling device? Wouldn't RMS make more sense?
Hopefully someone with some familiarity and/or better math skills can help me out.
Thanks!
Mechanical engineer needing some electrical help. So electrically piezo actuators are modeled as capacitors.
Power(P) = C*U*dU/dt, where U equals voltage.
I'm seeing several sites like here: http://www.piezo.ws/piezoelectric_actuator_tutorial/Piezo_Design_part3.php
They say for sinusoidal operation Pavg ≈ C*U^2*f and Pmax ≈ ∏*C*U^2*f (assuming you start from 0 Volts).
So my questions are:
1. How can you substitute U*f for dU/dt to get average power from the main power equation?
2. How is Pmax ≈ ∏*Pavg?
3. What does average power mean for a cycling device? Wouldn't RMS make more sense?
Hopefully someone with some familiarity and/or better math skills can help me out.
Thanks!