Elastic Outer Damper for Microphone Sensor Vibration Isolation
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Solution Overview
Problem
Vehicle components' vibrations interfere with microphone sensors, causing noise interference and reducing signal quality, especially in autonomous driving applications where precise sound detection is crucial.
Innovation Solution
A sensor device with an elastic outer damper and hold-down, integrated into the sensor housing, minimizes mechanical vibrations and decouples acoustic signals, allowing the microphone sensor to be mounted closer to vehicle components, reducing sound attenuation and enhancing signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor housing is mounted close to a vehicle component, then the sound channel length is reduced and sound attenuation is minimized, but the risk of mechanical contact with vibrating vehicle components increases
Solution Approach 1:
The patent introduces an elastic outer damper as an intermediary element between the sensor housing and the vehicle component. This damper serves as a mediator that allows the housing to be mounted close to the component while preventing direct mechanical contact. The elastic material absorbs vibrations and creates a compliant interface, enabling the dual benefits of short sound channel length and protection against vibration-induced interference.
Solution Approach 2:
The elastic outer damper provides beforehand cushioning by being pre-installed on the sensor housing before mounting. This cushioning layer is positioned in advance to absorb and attenuate mechanical vibrations from the vehicle component, preventing them from reaching the microphone sensor. The damper is designed with appropriate hardness and thickness to provide sufficient vibration isolation while maintaining close mounting proximity.
2Object-affected harmful factors
If the sensor housing is mounted away from the vehicle component, then mechanical contact interference is reduced, but the sound channel length increases and sound attenuation increases
Solution Approach 1:
The elastic outer damper acts as a mediator that enables close mounting without direct contact. It fills the gap between the housing and component, providing vibration isolation while maintaining acoustic coupling. This intermediary solution allows the housing to be positioned optimally for acoustic performance while the damper handles the mechanical vibration isolation function.
Solution Approach 2:
The patent changes the physical parameters of the mounting interface by introducing an elastic material with specific hardness and thickness properties. This parameter change allows the system to achieve both close proximity (for acoustic performance) and vibration isolation (for interference reduction). The elastic damper's material parameters are selected to optimize both acoustic transmission and mechanical vibration attenuation.
3Stability of the object's composition
If a rigid mounting structure is used, then mechanical stability is improved, but vibration transmission to the microphone sensor increases
Solution Approach 1:
The patent replaces the rigid mounting structure with a flexible elastic outer damper that covers the exterior of the sensor housing. This flexible element maintains the structural stability needed for mounting while its elastic properties allow it to deform and absorb vibrations from the vehicle component, preventing them from being transmitted to the microphone sensor.
Solution Approach 2:
The mounting structure becomes a composite system combining the rigid sensor housing with the elastic outer damper material. This composite approach leverages the stability of the rigid housing for structural integrity while the elastic material layer provides vibration isolation. The combination of rigid and elastic materials creates a hybrid mounting structure that achieves both stability and vibration attenuation.
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 solution effectively reduces noise interference, improves sound signal differentiation, and enables better detection of quiet sounds, enhancing autonomous driving functions such as responding to horn signals or sirens.
Implementation Method 1
at least one elastic outer damper, which is arranged on an outer side of the sensor housing
Implementation Method 2
the elastic outer damper is configured to at least reduce mechanical vibrations and/or an acoustic vibration of a component of a vehicle relative to the sensor housing
Data Source
AI summary
A sensor device. The sensor device has a sensor housing, which includes a circuit carrier including a microphone sensor, a cover, and a housing body, which has an internal space. The circuit carrier is arranged in the internal space. The sensor device includes at least one elastic outer damper, which is arranged on an outer side of the sensor housing on the cover and/or on the housing body.