Work machine
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Solution Overview
Problem
Sound signals collected by microphones in work machines often contain unnecessary components such as pseudo-sound components, which can adversely affect noise reduction and failure detection processes due to their influence on active noise control (ANC) and the accuracy of failure detection.
Innovation Solution
The work machine is equipped with microphones arranged at different locations inside the housing to collect sound, allowing the processor to enhance the operating noise component and suppress undesired results from unnecessary components by superimposing sound signals and generating an operating noise signal, while also using a speaker to inhibit noise propagation outside the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single microphone is used to collect sound for ANC and failure detection, then the device complexity is low, but the measurement precision and reliability of noise reduction and failure detection are degraded due to unnecessary components in the sound signal
Solution Approach 1:
The patent divides the sound collection function into multiple microphones positioned at different locations inside the housing. Each microphone captures sound from a specific position, allowing the system to segment the sound field and later reconstruct the operating noise more accurately by combining signals while filtering out unnecessary components.
Solution Approach 2:
The patent combines sound signals from multiple microphones to enhance the operating noise component. By merging the signals with appropriate weighting and phase adjustment, the system amplifies the desired operating noise while suppressing unnecessary components through constructive and destructive interference patterns.
2Reliability
If multiple microphones are arranged at different locations to improve measurement precision, then the accuracy of failure detection and noise reduction is improved, but the device complexity increases
Solution Approach 1:
The patent segments the housing interior into multiple measurement zones by placing microphones at different locations. This segmentation allows the system to capture spatial variations in sound fields, improving the reliability of noise reduction by accounting for different propagation paths and sources of operating noise.
Solution Approach 2:
The patent implements a feedback mechanism where sound signals from multiple microphones are continuously processed, and the results are used to adjust ANC control signals and failure detection algorithms. This closed-loop feedback improves noise reduction effectiveness by adapting to changing operating conditions and filtering out unnecessary components dynamically.
3Productivity
If sound signals containing unnecessary components are used directly for ANC processing, then the processing speed is fast, but the reliability of noise reduction and failure detection deteriorates
Solution Approach 1:
The patent performs preliminary processing of sound signals from multiple microphones before ANC processing, including phase alignment, amplitude weighting, and preliminary filtering of unnecessary components. This preliminary action prepares enhanced operating noise signals that can be processed quickly by the ANC system while maintaining high reliability.
Solution Approach 2:
The patent extracts the operating noise component from the total sound signal by using multiple microphones and signal processing techniques. Through spatial filtering and component separation, the system extracts the desired operating noise while removing unnecessary components such as wind noise and other interference, maintaining both processing speed and reliability.
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 approach effectively reduces the impact of unnecessary components on processes within the work machine, enhancing the operating noise component and minimizing unwanted noise propagation, thereby improving the accuracy of noise reduction and failure detection.
Implementation Method 1
microphones which collect sound inside the housing and output a sound signal which is an electrical signal corresponding to the collected sound
Implementation Method 2
using a speaker to inhibit noise propagation outside the housing
Data Source
AI summary
A work machine includes microphones inside the housing. The microphones are configured to collect sound inside the housing, and output sound signals that are electrical signals corresponding to the collected sound. The sound includes an operating noise generated inside the housing due to motion of a machine. The microphones are arranged at different locations inside the housing. The work machine is configured to execute a process related to the operating noise based on the sound signals from the microphones.