A Simple Model for Faraday Waves
  We show that the linear-stability analysis of the birth of Faraday waves on the surface of a fluid is simplified considerably when the fluid container is driven by a triangle waveform rather than by a sine wave. The calculation is simple enough to use in an undergraduate course on fluid dynamics or nonlinear dynamics. It is also an attractive starting point for a nonlinear analysis. 
John Bechhoefer (Dept. of Physics, Simon Fraser Univ., Burnaby BC,   Canada) Brad Johnson (Dept. of Physics, Western Washing...