Sound Balancer Redistributes Acoustic Pressure to Suppress HDD Rotational Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-capacity data storage systems face challenges in managing rotational vibration (RV) due to increasing environmental vibrational energy, which affects the performance of hard disk drives (HDDs) by causing read-write head misalignment and reducing data access speed.
Innovation Solution
Implementing a sound balancer mechanism between the system cooling fan and HDDs to redistribute sound pressure, thereby reducing rotational vibration by positioning the sound balancer to minimize the position error signal (PES) and torque induced by sound pressure, using a variably mounted sound balancer that can be tuned for optimal placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple HDDs are housed in a common enclosure to increase storage capacity, then storage density is improved, but rotational vibration increases due to mechanical coupling and environmental vibrations
Solution Approach 1:
A sound balancer structure is introduced as an intermediary element between the cooling fan and the HDDs. This structure redistributes sound pressure in the enclosure to reduce rotational vibration of the HDDs, while still allowing airflow for cooling. The sound balancer acts as a mediator that addresses the harmful vibration effect without compromising the storage density or cooling requirements.
2Measurement precision
If classical rotational vibration feed-forward systems are used to compensate for read-write head off-track issues, then positioning accuracy is improved, but effectiveness decreases at vibration frequencies above 2 kHz
Solution Approach 1:
The patent replaces the classical mechanical/feed-forward vibration compensation system with an acoustic-based approach. Instead of using mechanical sensors and actuators to counteract vibration, the sound balancer redistributes sound pressure fields to prevent rotational vibration at its source. This substitution enables effective vibration reduction across a broader frequency range, including high frequencies above 2 kHz where classical methods fail.
3Temperature
If system fans operate at higher RPM to meet temperature demands in high-density HDD systems, then cooling performance is improved, but vibrational energy generated increases
Solution Approach 1:
The sound balancer converts the harmful sound pressure and vibrational energy generated by high-RPM cooling fans into a beneficial effect. By redistributing the sound pressure field, the structure transforms the fan-generated acoustic energy into a pattern that reduces rotational vibration of the HDDs. This allows the system to maintain high cooling performance while actually utilizing the fan-generated sound pressure to suppress vibration.
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 sound balancer effectively suppresses rotational vibration, improving the position error signal and data access speed by redistributing sound pressure, thus enhancing the performance and stability of HDDs in high-capacity data storage systems.
Implementation Method 1
positioned between a cooling fan and a data storage device, the sound balancer redistributes sound pressure imparted upon the data storage device from the cooling fan
Data Source
AI summary
A data storage system may include multiple data storage devices, such as hard disk drives, a cooling fan, and a sound balancer structure between the fan and the drives. The sound balancer is intentionally positioned where it substantially balances, about the center of rotation of and along at least one axis of a fan-facing storage device, the sound pressure from the fan that impinges upon the fan-facing face of the storage device. This redistribution of the sound pressure suppresses sound pressure-induced torque upon and therefore rotational vibration of the storage device, which in turn enhances the track following capability of the storage device.