  In this paper we investigate the dissipativity property of a certain class of
Duhem hysteresis operator, which has clockwise (CW) input-output (I/O)
behavior. In particular, we provide sufficient conditions on the Duhem operator
such that it is CW and propose an explicit construction of the corresponding
storage function satisfying dissipation inequality of CW systems. The result is
used to analyze the stability of a second order system with hysteretic friction
which is described by a Dahl model.
