Wireless Rotating Shaft Deflection Measurement System
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Solution Overview
Problem
Existing systems for measuring the deflection of rotating shafts, particularly in large-size rotating shafts, face issues such as slippage during contact-type angle division, errors due to material and environmental influences in non-contact methods, and limitations in application range and reliability due to wired data transmission, making accurate and efficient measurement challenging, especially in complex structures like airplane engines and nuclear power plants.
Innovation Solution
A wireless system employing non-contact-type angle division devices and wireless contact-type displacement sensors, which transmit data via Bluetooth communication, eliminating slippage and errors, and allowing for easy installation and high mobility, while reducing radiation exposure in nuclear environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact-type division device is used to measure run-out and offset, then angle division can be performed, but slippage occurs during angle division causing measurement errors
Solution Approach 1:
The patent replaces the mechanical contact-type angle division device with a non-contact optical system. The optical encoder uses light beams to detect angular position without physical contact, eliminating slippage between mechanical components. The scale plate with radial lines and photodetectors create an optical measurement system that maintains measurement precision while removing the slippage problem inherent in mechanical contact systems.
2Reliability
If non-contact-type displacement sensors are used for measurement, then slippage is eliminated, but great error occurs depending on material and environment
Solution Approach 1:
The patent creates an optical copy or representation of the angular position using the scale plate with radial lines. Instead of directly measuring physical displacement that is sensitive to material and environmental factors, the system projects light patterns onto the scale plate and detects the optical pattern. This optical copying approach eliminates sensitivity to material properties and environmental conditions while maintaining high measurement precision.
3Reliability
If wired method is used for data transmission, then data can be transmitted, but many work hours are required for installing sensors and data transmission lines
Solution Approach 1:
The patent extracts and removes the data transmission lines from the measurement system by implementing wireless communication. The optical encoder and control unit communicate data wirelessly, eliminating the need for physical installation of cables and connectors. This extraction of the wired transmission component dramatically reduces installation time and complexity while maintaining data transmission reliability through wireless protocols.
4Length of stationary object
If wired method with long distance transmission is used, then data can be transmitted over distance, but noise is included in transmitted signal value
Solution Approach 1:
The patent replaces the electrical wired transmission system with wireless optical or electromagnetic communication. This substitution eliminates the long continuous cable that acts as an antenna for picking up electrical noise and interference. The wireless transmission method provides cleaner signal quality over distance by avoiding the physical transmission medium that introduces noise, while maintaining adequate transmission distance through wireless range.
5Reliability
If wired system is used for measurement, then data transmission can be achieved, but the system cannot be applied to narrow areas and complicated structures
Solution Approach 1:
The patent extracts and removes the physical data transmission cables from the measurement system, replacing them with wireless communication. This removal of physical constraints allows the system to be deployed in narrow spaces and complicated structures where cables would be difficult to route or physically obstructive. The wireless system maintains data transmission reliability while dramatically increasing adaptability to various installation environments including confined spaces and complex geometries.
Data Source
AI summary
Disclosed herein is a system for measuring the deflection of a rotating shaft in a wireless manner. The system includes a non-contact-type angle division device, a plurality of wireless contact-type displacement sensors, a plurality of wireless transmitters, a relay, and a data reader. The non-contact-type angle division device is placed on a vertical rotating shaft and measures and transmits the angle of rotation of the rotating shaft. The wireless contact-type displacement sensors are installed on the outer circumferential surface of the rotating shaft, and measure the strain of the rotating shaft. The wireless transmitters transmit data about the displacement of the rotating shaft measured by the wireless contact-type displacement sensor. The relay receives and relays transmission signals from the non-contact-type angle division device and the wireless transmitters. The data reader receives the transmission signals from the relay, and performs simulation reading.