Locally Stiffened Loadbeam for Hard Disk Drive Vibration Control
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Solution Overview
Problem
Existing suspension designs for hard disk drives fail to provide adequate dynamic performance during head-disk interface interactions, leading to unstable air bearing conditions and degraded disk drive performance due to poor damping of vibrational modes.
Innovation Solution
A locally stiffened loadbeam design is implemented by adding or retaining material strategically, or through forming processes like crimping, to enhance stiffness and damping around the dimple and flexure attachment points, reducing vibrational mode peaks and improving dynamic response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the loadbeam is made thin and mass-reduced to achieve high operational shock performance, then shock resistance improves, but dynamic performance deteriorates due to increased vibrational mode peaks
Solution Approach 1:
The patent applies local stiffening by adding material or forming processes (crimping) at specific locations on the loadbeam, particularly around the dimple and flexure attachment points. This creates non-uniform stiffness distribution where local regions have enhanced rigidity to suppress vibrational modes, while the overall thin and mass-reduced structure maintains its shock resistance capabilities.
2Stability of the object's composition
If the loadbeam is stiffened to reduce vibrational mode peaks, then dynamic performance improves, but shock performance deteriorates due to increased mass and reduced flexibility
Solution Approach 1:
Rather than uniformly stiffening the entire loadbeam, the patent implements localized stiffening only at critical regions (dimple area, flexure attachment points). This selective approach provides the necessary dynamic performance improvement while minimizing added mass and preserving the loadbeam's overall flexibility for shock absorption.
Solution Approach 2:
The patent applies partial stiffening action only where dynamically critical, rather than excessive full-coverage stiffening. The stiffening is concentrated at specific locations that have the greatest impact on vibrational mode suppression, avoiding unnecessary mass addition in non-critical regions.
3Stability of the object's composition
If material is added to stiffen the loadbeam, then dynamic performance improves, but manufacturing complexity increases
Solution Approach 1:
The patent achieves stiffening by modifying geometric parameters of the loadbeam through forming processes like crimping, rather than adding separate material components. This changes the physical state and shape of existing material to provide stiffness, avoiding the need for additional assembly steps and reducing manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The locally stiffened loadbeam design significantly reduces adverse vibrational mode peaks, enhancing the dynamic performance of the slider while maintaining acceptable static properties, thereby stabilizing the air bearing and improving disk drive operation.
Implementation Method 1
hydrodynamic pressure causes an air flow between the ABS of the slider and the surface of the disk. This flow, called the air-bearing layer, lifts and suspends the slider
Implementation Method 2
A locally stiffened loadbeam design is implemented by adding or retaining material strategically, or through forming processes like crimping, to enhance stiffness and damping around the dimple and flexure attachment points
Data Source
AI summary
A loadbeam is locally stiffened by either, 1. the addition of strategically placed extra material to the loadbeam, 2. not removing material during the etching process to form the loadbeam, or 3. special forming, by crimping or bending, at specific sites on the beam. The use of local stiffening, when placed about the loadbeam dimple or between the dimple and flexure attachment points, with or without additional damping, can significantly improve the dynamical response of the loadbeam and eliminate vibrational modes of a slider mounted on the loadbeam during HDI interactions with disk surface asperities during disk drive operation.