Hard Disk Drive Vibration Isolation via Three-Isolator Mounting
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Solution Overview
Problem
Existing methods for isolating computer components from rotational vibration are expensive and ineffective at frequencies above 50 Hz, where recent low-cost hard disk drives are particularly sensitive, leading to increased latency and potential damage.
Innovation Solution
A vibration isolation system comprising three isolators spaced at different angular positions around a central point, with varying stiffness along different axes, configured to have a rotational natural frequency of less than 45 Hz, effectively isolating computer components from rotational vibration at sensitive frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If viscous damping material is used to mount components, then vibration isolation is improved, but cost increases
Solution Approach 1:
The patent applies different stiffness characteristics to different isolators in the mounting assembly. Specifically, the isolators have varying spring constants tailored to their positions and the vibration frequencies they need to isolate, rather than using uniform damping material throughout. This localized optimization achieves effective vibration isolation at critical frequencies while reducing overall cost.
Solution Approach 2:
The patent changes the physical parameters of the isolators by specifying different spring constants for different isolators. The first isolator has a first spring constant, the second isolator has a second spring constant, and the third isolator has a third spring constant, where these values are specifically selected to isolate vibrations at frequencies above 50 Hz. This parameter variation allows cost-effective isolation without requiring expensive viscous damping materials.
2Area of stationary object
If components are mounted on common support structure, then space utilization is improved, but vibration transmission between components increases
Solution Approach 1:
The patent introduces isolators as intermediary elements between the support structure and the hard disk drives. These isolators act as mediators that decouple the mechanical connection between components, allowing multiple drives to be mounted on a common support structure while preventing vibration transmission between them. The isolators absorb and isolate the harmful vibrational energy.
3Strength
If isolators with higher stiffness are used, then structural stability is improved, but isolation effectiveness at high frequencies decreases
Solution Approach 1:
The patent applies different stiffness characteristics to different isolators based on their specific functions and positions. Rather than using uniformly high stiffness throughout the structure, each isolator is optimized with appropriate spring constants for its location and the vibration frequencies it needs to isolate, achieving both stability and high-frequency isolation effectiveness.
Solution Approach 2:
The patent employs a composite approach by combining multiple isolators with different spring constants in a single mounting assembly. This composite configuration of isolators with varying stiffness properties allows the system to maintain structural stability while effectively isolating vibrations across a broad frequency range, particularly above 50 Hz.
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 reduces latency and prevents damage by isolating hard disk drives from rotational vibration at frequencies above 50 Hz, allowing for efficient packing and compatibility with existing server rack constraints while maintaining effective isolation from both rotational and vertical vibrations.
Implementation Method 1
A technique to reduce the transmission of vibrational energy is to mount the components on the support structure using a viscous damping material, e.g., a viscoelastic material.
Implementation Method 2
three springs connecting the carrier to the base plate
Data Source
Figure 1~2
Figure 3~4
Figure 5A~5B
AI summary
A computer component mounting assembly includes a base plate, a carrier configured to receive a vibration sensitive computer component, and a vibration isolation system including three isolators connecting the carrier to the base plate. The three isolators are spaced at different angular positions around a central point, and the vibration isolation system is configured such that the vibration isolation system has a rotational natural frequency about the central point of less than 45 Hz.