Piezoelectric Microactuators for Use in Magnetic Disk Drives

Abstract

The orthogonal collocation method is applied to the study ofwall-stabilised plasma arcs. The numerical implementation of this method is simpler a.nd faster than that of finite difference methods of comparable accuracy. The solutions obtained agree with experiments and with previous finite difference calculations.For the steady-state DC case, radial temperature results are obtained for arcs in nitrogen and sulphur hexafluoride a? atmospheric pressure. It is shown that the inclusion of radiative self-absorption in sulphur hexafluoride arcs leads to a reduction in the centre temperature. a broadening of the temperature distributions and a smail decrease in the axial electric field.Solutions are obtained also for the time-dependent behaviour of a nitrogen arc following an abrilpi current interruption. In this transient case. self-induced radial flow is considered, leading to the additional process of convective loss.

Improved design of polymeric composite electrothermal micro-actuator for high track density hard disk drives

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