Click HERE to download a text file "mechanical_library.mdl" which contains SIMULINK models for an inertial mass (to illustrate putting blocks together) and several SIMULINK subsystems which implement the spring-mass-dashpot system and the electrostatic actuator examples of Chapter 7. The subsystems can be dragged into a model window just like SIMULINK function blocks. To see what is implemented inside the subsystems, use the "Look Under Mask" command. Once you drag a copy into a model window and look under the mask, you can modify the subsystem version in your model window at will. We recommend you NOT modify the elements in the library.