Rotating Acoustic Monitoring With Differential Signal Transmission
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Solution Overview
Problem
Existing monitoring systems for movable components in machine tools, such as grinding machines, face challenges in accurately detecting machining or dressing actions in tight spaces with unstable signal processing and high noise interference, leading to reduced accuracy and increased complexity in installation.
Innovation Solution
A monitoring system with a contactless communication unit and processing device integrated into the rotating component, utilizing a differential signal transmission line and analog-to-digital conversion within the rotor to enhance signal quality and reduce noise, allowing for real-time processing and transmission of digital signals with optimized bandwidth and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a monitoring system is installed in tight spaces around rotating components, then the system can detect machining actions, but the signal processing becomes unstable and noise interference increases
Solution Approach 1:
The patent introduces a differential signal transmission line as an intermediary between the acoustic sensor and the processing device. This differential transmission mechanism acts as a mediator that filters out common-mode noise while preserving the actual machining signals, thereby resolving the contradiction between detection accuracy and signal stability in noisy environments.
Solution Approach 2:
The patent replaces traditional single-ended signal transmission with a differential signal transmission system. This substitution transforms the signal processing approach from vulnerable to noise interference into a robust system that inherently rejects electromagnetic interference and ground loops, improving both measurement precision and reliability.
2Reliability
If signal processing is performed externally, then processing power is available, but installation complexity increases and signal quality degrades
Solution Approach 1:
The patent merges the acoustic sensor, differential signal transmission line, and processing device into an integrated monitoring system. This combination eliminates the need for separate external processing equipment and complex wiring, thereby improving signal quality through direct differential transmission while reducing installation complexity through system integration.
Solution Approach 2:
The monitoring system is designed with multi-functional capabilities, where the same integrated system performs both signal acquisition and processing functions. This universal design reduces the number of separate components needed, simplifying installation while maintaining high signal quality through the differential transmission architecture.
3Measurement precision
If traditional signal transmission is used, then system simplicity is maintained, but noise interference increases and detection accuracy decreases
Solution Approach 1:
The differential signal transmission line serves as an intermediary that actively combats noise interference. By transmitting signals through differential pairs, the system rejects common-mode noise while preserving the actual machining signals, thereby improving detection accuracy without adding significant system complexity.
Solution Approach 2:
The patent converts the harmful effect of electromagnetic interference into a benefit by using differential signaling. The differential transmission method inherently rejects common-mode noise and ground loops, transforming potential sources of interference into a robust noise-rejection mechanism that improves detection accuracy.
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 solution improves signal-to-noise ratio, increases accuracy and stability of vibration detection, reduces installation complexity, and enables autonomous and self-configurable monitoring with reduced workload on control devices, while maintaining high miniaturization and low energy consumption.
Implementation Method 1
The balancing head also comprises a vibration sensor (i.e. a microphone) for detecting the ultrasonic acoustic emissions caused by the contact between the grinding wheel and the workpiece or between the grinding wheel and a dressing tool (dresser).
Implementation Method 2
a first transmission line adapted for providing a differential signal from the acoustic sensor to the processing device
Data Source
AI summary
Monitoring system (12) for a mobile component (3), for example a rotating component, supported by a stationary component (2). The monitoring system (12) comprises: an acoustic sensor (10) which is positioned in the mobile component (3); a first amplifier (18) which is positioned in the mobile component (3); a contactless communication unit (14) provided with a first transceiver device (15) positioned in the mobile component (3) and of a second transceiver device (16) which faces the first transceiver device (15) and is positioned in the stationary component (2); a first connection line (19) connecting the sensor (10) to the first amplifier (18), an analog-to-digital converter (37) which is positioned in the movable component (3) or in the stationary component (2) and is configured to receive an analog signal and convert the analog signal into a digital signal, and a processing device (38) that is positioned in the movable component (3) or in the stationary component (2) and is configured to receive the digital signal from the analog-to-digital converter (37), process the digital signal, and obtain and output a processed digital signal.