Vacuum Cleaner Active Noise Control for Low-Frequency Fan Noise
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Solution Overview
Problem
Vacuum cleaners generate noise due to impeller rotation, causing discomfort and poor cleaning experience, with existing sound insulation limitations and variable noise levels based on user position, and interference issues with speaker performance.
Innovation Solution
A noise control module with a speaker and detection unit that reduces noise levels of 1500 Hz or less by shifting phase signals, combined with a separate sound outlet to synchronize noise and sound emissions, ensuring consistent noise reduction and preventing air or dust interference with the speaker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If sound insulation structure is added to exhaust outlet, then noise reduction is improved, but exhaust function is compromised
Solution Approach 1:
The exhaust outlet is divided into multiple separate outlets (first exhaust outlet and second exhaust outlet) positioned at different locations. This segmentation allows independent control of exhaust flow paths, enabling noise reduction at specific outlets without compromising overall exhaust function.
Solution Approach 2:
A noise control module is introduced as an intermediary device between the fan module and the exhaust outlets. This module actively generates anti-noise signals to cancel out harmful noises while allowing the exhaust function to proceed uninterrupted through the separated outlets.
2Object-generated harmful factors
If noise control module is added, then noise level is reduced, but device complexity increases
Solution Approach 1:
The noise control module is extracted as a separate, independent component from the main cleaner body. This modular approach allows the noise control function to be added without fundamentally redesigning the entire device, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The noise control module incorporates feedback mechanisms that automatically detect and respond to noise levels, adjusting its operation accordingly. This self-regulating feature reduces the need for complex manual controls and external adjustments, simplifying the overall system.
3Reliability
If exhaust outlet and sound outlet are positioned differently, then speaker performance is protected, but noise reduction effectiveness varies by user position
Solution Approach 1:
The exhaust function is segmented into multiple outlets positioned at different locations around the device. This spatial distribution ensures that regardless of user position, at least one exhaust outlet remains effective while the separate sound outlet maintains speaker performance.
Solution Approach 2:
Different outlets are assigned different functions: exhaust outlets are optimized for air flow and positioned for effective dust extraction, while the sound outlet is specifically designed and positioned to protect speaker performance. This local optimization allows each component to perform its function effectively without interfering with others.
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 provides a more pleasant user experience by reducing low-frequency noise, stabilizing noise levels regardless of user position, and preventing air or dust from affecting the speaker performance, while ensuring effective noise reduction through destructive interference.
Implementation Method 1
a detection unit detecting noise or vibration
Implementation Method 2
induce destructive interference to reduce the noise of the cleaner to be efficiently performed
Implementation Method 3
a speaker and a detection unit detecting noise or vibration, and configured to control an output of the speaker
Data Source
AI summary
To achieve the objects described above, the cleaner according to some embodiments of the present disclosure includes a main body forming an airflow path through which air is sucked and exhausted; a dust separation unit disposed in the airflow path and configured to separate dust from air; a fan module disposed in the airflow path and configured to move the air in the airflow path; and a noise control module including a speaker and a detection unit detecting noise or vibration, and configured to cause an output of the speaker to be reduced a level of the noise of at least one frequency range of 1500 Hz or less the noise generated when the fan module is operated, based on the detection signal of the detection unit. wherein the main body includes an exhaust outlet through which air in the airflow path is exhausted and a sound outlet through which the sound of the speaker is exhausted, wherein the exhaust outlet and the sound outlet look the same direction relative to the main body.