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In hard drives, often low damped, in-plane arm modes couple with low damped suspension modes resulting in high amplitude modal peaks that reduce servo performance.
English (United States)
This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately
82% of the total text.
Hard Disk Drive Comb Arm to Suspension Compliant Damped
drives, often low damped, in-plane arm modes couple
with low damped suspension modes resulting in high amplitude modal
peaks that reduce servo performance.
invention consists of an arm/suspension (HSA) compliant
joint that increases damping and decreases coupling between comb arms
and suspensions that reduce the amplitudes of particular modes. In
effect, many of the higher frequency transfer function modes are
If the joint
stiffness is reduced (more compliant) to a precise
value, the arm and HSA dynamic modes have reduced coupling. This
results in an improved dynamic response over a local bandwidth. The
joint compliance increases the local strain in the joint, which
allows the designer to increase modal damping by adding damping
material under shear strain. The Figure
shows a HSA connected to an
arm tip. Section A-A shows the cross
sectional detail of the swivel
joint. Mount block (3) is swaged into
the arm tip (2). There is a
feature on the mount block that controls the spacing of the mount
block to the arm tip. Section B-B shows
between the mount block and
arm tip are two layers of visco elastic damping/adhesive material (4)
and the base of the load beam (1). This
assembly provides rotational
compliance about the z-axis and shear deformation in the damping