Active Acoustic Control of Cooling Fan Speed
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Solution Overview
Problem
Information handling systems face challenges in minimizing noise generation, particularly due to variations in fan components, which can lead to higher noise levels, necessitating a worst-case design approach to meet noise specifications across different environmental conditions.
Innovation Solution
An active acoustic control system is implemented, using embedded and acoustic controllers, along with microphones, to dynamically adjust the speed of cooling fans based on real-time noise analysis, considering both fan noise and ambient noise levels, to maintain noise within specified limits while optimizing cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fan speed is increased to meet cooling requirements, then cooling performance is improved, but noise generation increases
Solution Approach 1:
The patent implements dynamic fan speed control that adjusts operational parameters in real-time based on actual noise measurements and cooling requirements, transitioning from static worst-case design to adaptive dynamic operation
Solution Approach 2:
The system incorporates noise measurement feedback loops where microphones continuously monitor fan noise and ambient noise, and the controller adjusts fan speed accordingly to maintain noise within specifications while optimizing cooling
2Object-generated harmful factors
If worst-case design approach is used to meet noise specifications, then noise compliance is ensured, but cooling efficiency decreases
Solution Approach 1:
The system performs self-adjustment by autonomously monitoring its own noise output and cooling performance, making real-time decisions to optimize the balance between noise compliance and cooling efficiency without external intervention
Solution Approach 2:
The patent changes operational parameters dynamically by adjusting fan speed based on measured noise levels and cooling demands, moving from fixed worst-case parameters to variable optimized parameters
3Object-generated harmful factors
If fan speed is reduced to minimize noise, then noise generation decreases, but cooling performance deteriorates
Solution Approach 1:
The system dynamically adjusts fan speed to the minimum necessary level at each moment based on actual thermal conditions and noise constraints, rather than operating at fixed high speeds for safety margins
4Adaptability or versatility
If ambient noise varies, then environmental adaptability is improved, but noise control complexity increases
Solution Approach 1:
The system uses feedback from ambient noise measurements to adjust fan operation, automatically adapting to environmental conditions through continuous monitoring and real-time control adjustments
Solution Approach 2:
The controller acts as an intermediary that processes both fan noise and ambient noise measurements, mediating between these two noise sources to determine optimal fan speed settings
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 solution effectively reduces noise pollution by dynamically controlling fan speeds, ensuring that information handling systems operate within noise specifications while maintaining optimal cooling performance, even in varying environmental conditions.
Implementation Method 1
an acoustic controller operable to control the operating speed of the cooling fan based on a sound level
Implementation Method 2
cooling fan... receiving fan speed information indicating a present operating speed of the cooling fan
Data Source
AI summary
An initial operating speed of a cooling fan at an information handling system is determined. A microphone is located at the system to favor acquisition of ambient sound relative to acquisition of sound emanating from the cooling fan. An audio signal is received from the microphone. The operating speed of the cooling fan is adjusted based on a level of the audio signal.