@TechReport{	  it:2007-025,
  author	= {Peter Naucl{\'e}r and Torsten S{\"o}derstr{\"o}m},
  title		= {Polynomial Feedforward Design Techniques for a Mechanical
		  Wave Diode System},
  institution	= {Department of Information Technology, Uppsala University},
  department	= {Division of Systems and Control},
  year		= {2007},
  number	= {2007-025},
  month		= sep,
  abstract	= {This paper considers feedforward control of extensional
		  waves in a bar. The system is designed to have properties
		  analogous to those of an electrical diode and is therefore
		  referred to as a mechanical wave diode. We present three
		  different feedforward control strategies. Two of them
		  relies on an `ideal' design which is derived in the
		  noise-free case, whereas the third is based on Wiener
		  filtering theory.
		  
		  The control strategies are compared and evaluated for
		  different signal models and in the presence of measurement
		  noise. We show that the performance of the device is
		  improved by using the (optimal) Wiener feedforward filter.
		  }
}