A differentiation changes the position into the velocity. And it goes just before "Fv/m". You can change the value of elements by double-clicking. If this applet looks something weird, please reload it. The connection of the block diagram has changed and "Beta" has become "BetaS"(S is Laplace transfer element and that means a differentiation). Beta has changed to 1.0e-4 because we had the response slow due to a big value of Beta last time. If you choose "Step-Res", you can see how the pickup follows the "step" displacement. You see it has become faster!! You may implement a focus servo having a function (Alpha+BetaS) to feedback the position. "Alpha" affect the spring constant and "Beta" does the oppressiveness. Both of them are independent each other!! The basis of feedback control is to support some mechanical factor by some artificial ways as we introduced above. Actual servo implementation is more complicated than this class. For more useful technique, please wait until we make new classes!! Back to Page 1 This class is produced by DIGITALFILTER.COM and Ueno Design Factory