Epicyclic Gearbox Sensor Mounting for Early Defect Detection
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Solution Overview
Problem
Epicyclic gearboxes in wind turbines face challenges in detecting initial and secondary damage due to small vibration amplitudes being modulated by heavy gear impacts, making it difficult to identify significant frequencies, which can lead to severe secondary damage and costly repairs.
Innovation Solution
Mounting sensors on rotating parts of the gearbox, such as planet gear shafts and carriers, to create a direct transmission path for structure-born noise and vibrations, using accelerometers and microphones for vibration and acoustic emission measurement, and connecting them to data transmitters for wireless data transmission to an external receiver for continuous monitoring and early defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are mounted on the gearbox housing, then the sensors are protected from gear oil and mechanical damage, but the vibration amplitudes from initial damage are modulated by heavy gear impacts and become difficult to detect
Solution Approach 1:
The patent uses the gearbox housing as an intermediary structure to mount sensors away from direct gear oil exposure while maintaining vibration transmission capability. The housing acts as a mediator that protects sensors from harmful factors (gear oil, mechanical damage) while still allowing structure-borne vibrations to reach the sensors for detection.
Solution Approach 2:
The patent transitions sensor mounting from a direct proximity approach (near gears) to a spatially separated approach (on housing), changing the dimensional relationship between sensors and gear components. This spatial repositioning allows sensors to detect vibrations through the housing structure while avoiding direct exposure to harmful environments.
2Measurement precision
If sensors are mounted close to the gears to detect vibrations directly, then vibration detection sensitivity improves, but sensors become exposed to gear oil and mechanical damage
Solution Approach 1:
The patent applies beforehand cushioning by positioning sensors on the gearbox housing before any damage occurs, creating a protected detection point that can monitor gear conditions without being directly exposed to the harsh environment. This preventive positioning allows early damage detection while shielding sensors from harmful factors.
Solution Approach 2:
The gearbox housing serves as an intermediary that transmits vibrations from gears to sensors while protecting sensors from gear oil and mechanical damage. This mediator approach allows sensors to benefit from close proximity vibration detection without directly facing the harmful factors present near the gears.
3Measurement precision
If complex filtering methods are used to process sensor output, then damage identification capability improves, but the system complexity and difficulty of identifying significant frequencies increase
Solution Approach 1:
The patent extracts the significant vibration signals directly at the source by mounting sensors on the gearbox housing, which captures structure-borne vibrations before they are modulated by heavy gear impacts. This extraction approach simplifies subsequent signal processing by obtaining cleaner, more directly relevant vibration data that requires less complex filtering and analysis.
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 enables early detection of defects, reducing the risk of major damage and allowing for preventive maintenance without shutting down the wind turbine, while minimizing the risk of sensor interference and damage from gear oil and providing a cost-effective solution.
Implementation Method 1
one or more sensors for measuring condition values of the wind turbine, wherein the one or more sensors are mounted on one or more rotating parts of the gearbox
Implementation Method 2
one or more sensors for measuring condition values of the wind turbine, wherein the one or more sensors are mounted on one or more rotating parts of the gearbox
Data Source
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AI summary
The invention relates to a wind turbine (1) comprising at least one gearbox (7). The gearbox (7) comprises one or more sensors (21) for measuring condition values of the wind turbine (1) and is characterized in that the one or more sensors (21) are mounted on one or more rotating parts of the gearbox (7). The invention further relates to an epicyclic gearbox (11) comprising a gearbox housing (20), one or more gearbox parts rotating in relation to the housing (20), and one or more sensors (21) for measuring condition values of the gearbox (11). The epicyclic gearbox (11) is characterized in that, the one or more sensors (21) are mounted on one or more of the rotating parts of the gearbox (11).