A piecewise-linear reduced-order model of squeeze-film damping for   deformable structures including large displacement effects
  This paper presents a reduced-order model for the Reynolds equation for deformable structure and large displacements. It is based on the model established in [11] which is piece-wise linearized using two different methods. The advantages and drawbacks of each method are pointed out. The pull-in time of a microswitch is determined and compared to experimental and other simulation data. 
A. Missoffe, J. Juillard, Denis Aubry (LMSSM)