Asymmetrical Cooling Fan Frame Reduces Resonance
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Solution Overview
Problem
Conventional cooling fans increase noise and vibration when rotating speed is increased to enhance heat dissipation, as the symmetrical design leads to resonance.
Innovation Solution
An asymmetrical design for the cooling fan, featuring an impeller with blades extending from a hub and a fan frame with asymmetrical ribs and a supporting base, which reduces resonance and noise by varying the vibration frequencies across different locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotating speed of the blades is increased to improve heat dissipation, then the airflow is increased, but the vibration and noise generated by the cooling fan are increased
Solution Approach 1:
The patent applies asymmetry by making the supporting base and/or ribs of the fan frame non-symmetrical with respect to the impeller. This asymmetrical configuration breaks the resonance that occurs in symmetrical designs during high-speed rotation, thereby reducing vibration and noise while maintaining the ability to operate at higher speeds for improved heat dissipation
2Productivity
If the rotating speed of the blades is increased to improve heat dissipation, then the airflow is increased, but the resonance generated by the symmetrical design is increased
Solution Approach 1:
The patent applies asymmetry by making the supporting base and/or ribs of the fan frame non-symmetrical with respect to the impeller. This asymmetrical configuration breaks the resonance that occurs in symmetrical designs during high-speed rotation, thereby reducing vibration and noise while maintaining the ability to operate at higher speeds for improved heat dissipation
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 asymmetrical design effectively decreases noise and vibration by distributing vibration frequencies differently, improving the cooling fan's operational efficiency and reducing resonance.
Implementation Method 1
the asymmetrical design leads to resonance
Data Source
AI summary
A cooling fan with shapes, sizes, and placements of frame and supporting ribs tuned to reduce operational vibration and noise includes a fan frame, a supporting base, and a plurality of ribs. The fan frame includes a bottom plate and a sidewall connected to the bottom plate. The supporting base is formed at the bottom plate. The plurality of ribs extends from an outer circumferential surface of the supporting base to the sidewall. At least one of the plurality of ribs and the fan frame is asymmetrical with respect to the supporting base.