Work machine
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Solution Overview
Problem
The collection of sound signals by microphones in work machines often includes pseudo-sound components, such as wind noise, which can interfere with active noise control (ANC) and reduce the accuracy of failure detection.
Innovation Solution
A work machine configuration that includes a housing with an opening and a path for airflow control, featuring a microphone positioned in a receiving space defined by a partition wall that extends over the entire height of the path, effectively inhibiting wind noise from reaching the microphone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the microphone is exposed to the airflow path to collect operating noise, then the noise collection capability is improved, but wind noise (pseudo-sound) is also collected which degrades measurement precision
Solution Approach 1:
The housing is divided into multiple chambers: a first chamber for airflow passage and a second chamber for microphone placement. The partition wall segments the internal space to separate the airflow path from the microphone, allowing operating noise to be transmitted through the partition while preventing direct wind noise exposure.
Solution Approach 2:
The partition wall acts as an intermediary structure that transmits operating noise vibrations to the microphone while blocking direct wind noise. The partition wall with its opening allows sound transmission but prevents the harmful airflow from directly reaching the microphone.
2Measurement precision
If the partition wall completely blocks the airflow path to protect the microphone, then wind noise is eliminated, but operating noise transmission is reduced
Solution Approach 1:
The partition wall is designed with localized openings at specific positions and orientations. The opening is configured to face away from the airflow direction, creating local quality differences that allow operating noise transmission while maintaining wind noise protection in other areas.
Solution Approach 2:
The solution moves from a one-dimensional blockage approach to a three-dimensional configuration where the partition wall opening's orientation and position are optimized. The opening faces a direction away from the airflow, utilizing spatial dimensionality to achieve both noise transmission and wind protection.
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 configuration allows for effective collection of operating noise while significantly reducing the influence of wind noise, thereby enhancing the accuracy of noise reduction and failure detection processes.
Implementation Method 1
A sound signal output as an electrical signal from the microphone by sound collection may sometimes contain a pseudo-sound component (specifically, a fluid pressure fluctuation component) as a wind noise component
Data Source
AI summary
The work machine includes a path leading into a housing from an opening. The path is provided to control an airflow generated by motion of a machine. The work machine includes a microphone. The microphone is configured to collect sound in the housing, including operating noise generated in the housing by the motion of the machine. The work machine further includes a structure that defines a receiving space for the microphone along the path through which the operating noise propagates outside the housing. The structure includes an open structure that connects the receiving space with the path and faces downstream in the path. The structure surrounds the receiving space upstream of the open structure in the path.