HDD Baseplate Diverter and Spoiler for Flow Control
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Solution Overview
Problem
Hard disk drives face challenges in managing vibration induced by gas flow, which affects head positioning accuracy and can lead to track misregistration, as controlling gas flow within the device is complex due to limited space and varying flow patterns between disks and the baseplate.
Innovation Solution
The integration of a flow diverter and spoiler structure within the data storage device baseplate redirects gas flow away from the head-stack assembly and disrupts unstable wakes, creating a more stable flow environment that reduces flow-induced vibration and improves head positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas flow control structures are added to reduce flow-induced vibration, then head positioning accuracy improves, but device complexity increases
Solution Approach 1:
The flow diverter and spoiler structures are integrated into the baseplate itself, merging the flow control function with the structural support function. This eliminates the need for separate flow control components while achieving vibration reduction and improving head positioning accuracy.
Solution Approach 2:
The baseplate is designed to serve multiple functions: providing structural support for the disk stack and simultaneously acting as a flow control mechanism through integrated diverter and spoiler structures. This multi-functionality reduces overall device complexity while maintaining vibration control capabilities.
2Ease of manufacture
If flow control structures are integrated into the baseplate, then manufacturing complexity is reduced, but design precision requirements increase
Solution Approach 1:
By integrating the flow diverter and spoiler into the baseplate as a single unified structure, the number of separate manufacturing steps and assembly operations is reduced. The baseplate can be manufactured as one piece with built-in flow control features, simplifying the overall manufacturing process.
Solution Approach 2:
The design incorporates specific geometric parameters for the diverter and spoiler structures that can be optimized through simulation and testing. By carefully controlling key dimensions and angles during manufacturing, the flow control performance can be achieved without requiring excessively complex manufacturing processes.
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 solution effectively reduces flow-induced vibration and track misregistration by redirecting gas flow and stabilizing the wake effect, enhancing the operational stability and accuracy of the head-stack assembly.
Implementation Method 1
Because the recording disks spin within an HDD during operation, gas flow is generated
Implementation Method 2
redirects gas flow away from the head-stack assembly and disrupts unstable wakes
Data Source
AI summary
A unitary enclosure base for a data storage device integrally includes a first surface beneath a bottom disk, a bypass channel formed with an entry area with a lower surface below the first surface, a second surface lower than the first surface and beneath an actuator arm that services the bottom surface of the bottom disk, and a flow diverter extending upward from the first surface and positioned upstream of the actuator arm. The diverter may be positioned relative to the bypass channel such that disk-generated gas flow is diverted into the bypass channel away from the actuator arm. The base may further include a spoiler extending upward from the first surface and positioned downstream of the actuator arm. The spoiler may be positioned to inhibit a wake effect upon the actuator arm.