Laminated Glass Vibration Control for Wideband Window Noise Shielding
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Solution Overview
Problem
Existing sound insulation devices struggle to effectively reduce noise in both low-frequency and medium-to-high-frequency bands, particularly high-frequency noise above 150 Hz, which can enter vehicle interiors through windows.
Innovation Solution
A sound insulation device utilizing a glass sheet composite with a vibration output unit, exterior and interior sound detection units, and a control unit to generate a cancel signal that vibrates the glass sheet to block noise across a wide frequency band, including high frequencies, by dividing the glass sheet into excitation and vibration regions and using adaptive algorithms to synchronize and cancel noise signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a general speaker with a vibrating body such as a cone paper is used to output anti-phase sound, then noise in low-frequency band can be effectively reduced, but noise reduction in medium-to-high-frequency band is poor
Solution Approach 1:
The invention divides the sound insulation function into two separate systems: a passive sound insulation structure (glass sheet composite) for high-frequency noise and an active noise control system (speaker) for low-frequency noise. This segmentation allows each subsystem to optimize its performance for its designated frequency range, resolving the contradiction between low-frequency effectiveness and high-frequency coverage.
Solution Approach 2:
The invention employs a glass sheet composite material with specific properties (loss coefficient and longitudinal wave sound velocity) to create a passive sound insulation barrier that effectively blocks high-frequency noise. This composite material approach, combined with the active speaker system, enables broad frequency band coverage while maintaining effectiveness in both low and high-frequency ranges.
2Object-affected harmful factors
If a passive sound insulation structure is used to block high-frequency noise, then high-frequency noise reduction is improved, but the ability to reduce low-frequency noise is insufficient
Solution Approach 1:
The invention clearly segments the noise control task by frequency band: the glass sheet composite passive structure handles high-frequency noise blocking, while the active speaker-based noise control system handles low-frequency noise reduction. This division of labor ensures both high-frequency and low-frequency noise are effectively addressed without compromising either frequency range.
Solution Approach 2:
The invention changes the approach parameter from a single unified system to a dual-system architecture with different operational principles. The passive glass sheet uses physical barrier properties optimized for high frequencies, while the active speaker system uses anti-phase sound generation optimized for low frequencies, thereby achieving comprehensive noise reduction across the full frequency spectrum.
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 device effectively reduces noise in a wide frequency range, including high frequencies, by preventing noise transmission through windows and enhancing sound insulation in vehicle interiors.
Implementation Method 1
a vibration output unit (13) fixed to the glass sheet composite (11) and vibrating the glass sheet composite (11) according to an input signal
Implementation Method 2
an exterior sound detection unit (1) detecting a sound from a noise source or a vibration source and outputting a reference signal according to a detection result
Implementation Method 3
an interior sound detection unit (3) detecting a sound in the interior space and outputting an error signal according to a detection result
Implementation Method 4
a control unit (5) including an adaptive filter that generates a cancel signal having a phase opposite to a phase of the reference signal to minimize the error signal
Data Source
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AI summary
The present invention comprises: a glass sheet structure that is configured so as to include an intermediate layer between glass sheets and partitions an indoor space and an outdoor space; a vibration output unit that is fixed to the glass sheet structure and causes the glass sheet structure to vibrate in accordance with an input signal; an outdoor sound detection unit that detects sound from a noise source or a vibration source in a correlative relationship with sonic vibration induced in the glass sheet structure, and outputs a reference signal corresponding to the detection result; an indoor sound detection unit that detects sound in the indoor space and outputs an error signal corresponding to the detection result; and a control unit that has an adaptive filter that generates a cancel signal of a phase opposite that of the reference signal so as to minimize the error signal, and causes the cancel signal from the adaptive filter to be output by the vibration output unit.