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Piezoelectric Modal Sensor/Actuator Devices for DASD Active Damping Vibration Control

IP.com Disclosure Number: IPCOM000121627D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Related People

Chiang, WW: AUTHOR [+3]

Abstract

Disclosed below are specific devices developed using piezoelectric materials, such as polyvinylidene fluoride (PVF2) and lead zirconate titanate (PZT), to implement the modal sensor/actuator concept for active damping vibration control of direct access storage device (DASD) components, e.g., actuator arm, suspension, head disk assembly (HDA) housing, flexible cable, etc. In comparison to classical pas sive damping approaches, this approach is potentially more effective and has lower inertia increase. The physical concept behind the design of modal sensors and actuators lies in mapping the strain/stress created by the presence of a specific mode by using methods, such as shaping the effective surface electrode, varying the polarization profile, and skewing the principal axes, etc. [*].

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Piezoelectric Modal Sensor/Actuator Devices for DASD Active Damping
Vibration Control

      Disclosed below are specific devices developed using
piezoelectric materials, such as polyvinylidene fluoride (PVF2) and
lead zirconate titanate (PZT), to implement the modal sensor/actuator
concept for active damping vibration control of direct access storage
device (DASD) components, e.g., actuator arm, suspension, head disk
assembly (HDA) housing, flexible cable, etc.  In comparison to
classical pas sive damping approaches, this approach is potentially
more effective and has lower inertia increase.  The physical concept
behind the design of modal sensors and actuators lies in mapping the
strain/stress created by the presence of a specific mode by using
methods, such as shaping the effective surface electrode, varying the
polarization profile, and skewing the principal axes, etc. [*].

      The shape of the first mode of a 3380 type of suspension,
calculated by the finite element method is shown in Fig. 1a.  The
strain created by this first mode is then calculated by
differentiating the mode shape twice with respect to the spatial
coordinate along the longitudinal direction.  By shaping the surface
electrode and reversing the polarity of the piezoelectric material
across the neck of the pattern (Fig. 1b) according to the calculated
strain distribution, a modal sensor/actuator which senses and excites
only the first bending mode of a 3380 suspension can be created.
Furt...