Disk Device Damping Member for Multi-Actuator Torsional Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-actuator disk devices, such as hard disk drives, the independent pivot operations of actuator blocks can lead to torsional resonant modes, causing vibrations that result in instability and interference between actuator assemblies, affecting the device's operational stability and reliability.
Innovation Solution
The implementation of damping members between the outer circumferential surface of the base shaft and the inner circumferential surface of the bearing shaft, specifically designed to reduce torsional vibrations by being placed in strategic locations, such as between actuator blocks, to prevent resonant modes and improve actuator assembly stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple actuator blocks are supported on the same base shaft to increase storage capacity, then the number of disks that can be accommodated increases, but torsional resonant modes occur causing vibrations and instability
Solution Approach 1:
A damping member is introduced as an intermediary element between the base shaft and the bearing shaft. This damping member absorbs and dissipates torsional vibrations generated during independent pivot operations of multiple actuator blocks, preventing resonant modes and stabilizing the system while maintaining the multi-actuator configuration for high storage capacity
Solution Approach 2:
The damping member changes the dynamic parameters of the shaft system by adding energy dissipation characteristics. This modifies the torsional vibration properties of the base shaft-bearing shaft assembly, shifting the system away from resonant conditions and reducing vibrations during actuator operation
2Adaptability or versatility
If actuator blocks operate independently to enable multi-actuator configuration, then the number of accessible disks increases, but vibrations from one actuator interfere with others
Solution Approach 1:
The damping member serves as a mediator that isolates the harmful vibrations generated by one actuator block from affecting other actuator blocks. It allows independent operation of multiple actuators while filtering out the harmful torsional vibrations that would otherwise cause mutual interference
Solution Approach 2:
The damping member converts the harmful torsional vibrations generated during actuator operation into beneficial energy dissipation. The vibrations that would cause interference are instead absorbed and dissipated as heat in the damping material, transforming a harmful effect into a useful vibration reduction mechanism
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 damping members effectively reduce torsional vibrations and prevent torsional resonant modes, enhancing the operational stability and reliability of the disk device by minimizing mutual interference between actuator assemblies.
Implementation Method 1
damping members effectively reduce torsional vibrations and prevent torsional resonant modes
Data Source
AI summary
A disk device includes one or more disks, a base shaft, a bearing shaft, first and second bearing units, first and second actuator assemblies, and a damping member. The bearing shaft has a tubular portion fixed around the base shaft. The first and second bearing units are attached around the bearing shaft and aligned in an axial direction of the bearing shaft. The first and second actuator assemblies are coupled to the first and second bearing units, respectively. The damping member is provided between an outer circumferential surface of the base shaft and an inner circumferential surface of the tubular portion of the bearing shaft.