A theoretical model for acoustic emission sensing process in contact/near-contact interfaces of magnetic recording system

This article presents a theoretical model to account for acoustic emission (AE) sensor dynamics in the measurement of head-disk contact/near-contact i n magnetic recording system. The AE transducing system is modeled as a line ar dynamic system excited by deterministic and random input. The impulse re sponse method and power flow method are applied, respectively, to character ize the system responses. An analytical model is established to describe th e dependence of AE output on system transfer functions, filter parameters, excitation forms, contact force, velocity, topographic and mechanical param eters, as well as lubricant thickness. (C) 1999 American Institute of Physi cs. [S0021-8979(99)71408-8].