Vehicle Window Laminate for Active Noise Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern passenger vehicles face challenges in minimizing noise from external sources, particularly through windows, which transmit vibrations and sound waves effectively, affecting passenger comfort and acoustic quality.
Innovation Solution
A sound management system for vehicles featuring a laminate on the window with a ply-type construction, including a base layer, intermediate sound-attenuating layer, and cover layer, combined with a sound sensor and actuator to actively control noise levels by generating counter-vibrations and sound waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If standard safety glass is used for vehicle windows, then safety requirements are met, but noise transmission from outside is high
Solution Approach 1:
The patent applies composite materials by creating a laminate structure that combines multiple layers including glass layers and polymer layers with different acoustic impedances. This composite structure reduces noise transmission while maintaining the safety requirements of standard safety glass, as the layered composite design provides both structural integrity and acoustic attenuation properties.
Solution Approach 2:
The patent implements the nesting principle by placing the laminate structure within the existing vehicle window assembly. The laminate is positioned between the interior and exterior environments, nested within the window frame structure, allowing it to function as an acoustic barrier while integrating with the existing safety glass system.
2Object-affected harmful factors
If a vibration reduction film with electrodes is applied to the window, then vibration control is achieved, but device complexity increases
Solution Approach 1:
The patent extracts the complex electrode pattern requirement by focusing on the laminate's inherent acoustic attenuation properties rather than relying on complex electrode configurations. The solution takes out the need for sophisticated piezoelectric actuation systems and instead uses the laminate's material properties to achieve vibration reduction, simplifying the overall device complexity.
Solution Approach 2:
The laminate structure provides self-service by utilizing its own layered construction and material properties to attenuate vibrations and noise passively, without requiring external power sources, control systems, or complex electrode patterns. The structure serves its acoustic function inherently through its design.
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 system effectively reduces external noise transmission, enhancing passenger comfort and acoustic quality by actively canceling out unwanted vibrations and sounds, while maintaining a compact footprint and compatibility with existing vehicle configurations.
Implementation Method 1
The laminate is configured to reduce noise in the interior space of the vehicle
Implementation Method 2
The windows are good transmitters of vibrations and sound waves... which has the benefit of damping outside sounds
Implementation Method 3
actuating, by the controller, a sound actuator to control generation of vibrations and transmission of sound into the interior space of the vehicle
Data Source
AI summary
A sound management system for a vehicle is provided. The sound management system includes a vehicle window coupled to a vehicle body. The vehicle body defines an interior space of the vehicle. The sound management system also includes a laminate disposed on the vehicle window. The laminate is configured to reduce noise in the interior space of the vehicle.