Dynamic Fan Positioning for Destructive Noise Interference
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Solution Overview
Problem
The noise generated by multiple computer fans in datacenters and offices becomes a significant issue due to their operational requirements for cooling, which can lead to high noise levels that may damage hearing and disrupt environments.
Innovation Solution
A method involving a controller that senses sound pressure at specified locations and automatically adjusts the position or speed of fans to reduce noise levels, utilizing actuators and extendable ducts to achieve destructive interference and minimize noise through positioning and speed adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fan speed is increased to cool computer components, then cooling effectiveness is improved, but noise level increases
Solution Approach 1:
The patent applies destructive interference to convert the harmful noise effect into a beneficial reduction. By positioning fans to create sound waves that interfere destructively at the listener's location, the noise harm is transformed into quietness while maintaining the necessary cooling function through increased fan speeds.
2Productivity
If multiple fans are used to increase air flow, then cooling capacity is improved, but noise level increases
Solution Approach 1:
The patent merges the acoustic fields of multiple fans through coordinated positioning and control. By treating the combined sound waves from multiple fans as an integrated acoustic system, destructive interference patterns are created that reduce overall noise while maintaining the cumulative air flow benefit of having multiple fans operating.
3Device complexity
If fan position is fixed, then device complexity is reduced, but noise control capability is limited
Solution Approach 1:
The patent introduces dynamic positioning capabilities for fans, allowing them to move to optimal locations that create destructive interference patterns. This dynamic adjustment enables adaptive noise control while maintaining relatively simple overall device architecture through controlled movement rather than complex fixed mechanisms.
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
This approach effectively reduces noise levels by up to 3-6 decibels, providing a noticeable decrease in fan noise while maintaining effective cooling, and can be implemented in various settings with multiple compute nodes.
Implementation Method 1
utilizing actuators and extendable ducts to achieve destructive interference and minimize noise through positioning and speed adjustments
Data Source
AI summary
A method includes sensing sound pressure at a specified location, and a controller automatically adjusting a position of one or more fans among a plurality of fans to reduce the sound pressure sensed at the specified location. The position of the one or more fans may, for example, be adjusted using an actuator to change the distance from the fan and the specified location, which may be a location of a user. Optionally, the method may further include the controller automatically adjusting a speed of one or more fans among the plurality of fans to reduce the sound pressure sensed at the specified location. The position and speed of one or more fans may be adjusted to provide destructive interference at the specified location.