Microphone Housing for Fluidic Noise Diagnosis
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Solution Overview
Problem
Existing measurement devices for diagnosing noise in fluidic systems, such as those using structure-borne sound microphones, are prone to failure due to high sensitivity and inability to withstand pressure surges, making them unsuitable for robust and miniaturized applications in pneumatic and hydraulic systems.
Innovation Solution
A microphone with a housing open on both sides of the membrane, equipped with filter means for attenuating and time delaying frequencies above a threshold, allowing lower frequencies to pass through, which equalizes pressure and prevents membrane damage, while enabling sensitive noise detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a structure-borne sound microphone is used to detect noise in fluidic systems, then measurement precision is improved, but reliability deteriorates due to membrane failure from pressure surges
Solution Approach 1:
The housing is segmented into multiple pressure equalization chambers separated by the membrane, with each chamber having its own opening. This segmentation allows the membrane to experience balanced pressure forces while still detecting acoustic signals, resolving the contradiction between sensitivity and robustness.
Solution Approach 2:
The patent creates equipotential pressure conditions on both sides of the membrane by providing openings that allow pressure equalization. This ensures that the membrane operates under balanced pressure conditions, preventing failure from pressure surges while maintaining noise detection capability.
2Reliability
If the microphone housing is made robust to withstand pressure fluctuations, then reliability is improved, but measurement precision deteriorates due to reduced membrane sensitivity
Solution Approach 1:
Different parts of the housing have different properties: the housing structure provides robustness for pressure resistance, while the membrane area maintains high sensitivity for acoustic detection. The filter means are selectively placed to affect only specific frequency ranges, preserving low-frequency noise detection while filtering high-frequency interference.
Solution Approach 2:
The patent introduces filter means that change the frequency parameter of transmitted signals. By filtering high-frequency components while allowing low-frequency signals to pass, the system maintains measurement precision for relevant noise frequencies while the robust housing structure provides pressure surge resistance.
3Object-affected harmful factors
If filter means are added to attenuate high frequencies, then harmful factors are reduced, but device complexity increases
Solution Approach 1:
The filter means are merged with the existing housing structure rather than being separate components. The housing itself is configured to provide both structural robustness and acoustic filtering functionality, reducing overall device complexity while still attenuating high-frequency harmful signals.
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 allows for reliable noise detection in fluidic systems, even under severe pressure fluctuations, by equalizing forces on the membrane and filtering out high-frequency noise, thereby enhancing sensitivity and robustness compared to standard microphones.
Implementation Method 1
The pressure fluctuations of the sound signal are thus converted quite directly, by a membrane, to mechanical oscillations of the membrane
Implementation Method 2
filter means for at least one of attenuation and time delay of frequencies which are equal to or greater than a threshold value, and for permitting frequencies which are below the threshold value to pass through
Data Source
AI summary
A measurement device and method for diagnosing noise in fluidic systems. A microphone, which is arranged at least partially in the area of the flow medium, compensates for pressure surges in the flow medium. The microphone receives the noise via a membrane and converts it to an electrical signal for evaluation of the noise source by an electronic diagnosis unit. To compensate for pressure surges in the flow medium, the membrane of the microphone is arranged in a housing, which is open on both sides of the membrane and whose two openings have pressure applied to them by the flow medium as a sound source, with at least one of the two openings being provided, in order to detect noise, with filter means for attenuation and/or time delay of frequencies which are in an expected noise spectrum, while the filter means allows lower frequencies produced by the pressure fluctuations in the flow medium to pass through.