Wind Turbine Main Shaft Assembly for Accurate Deflection Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wind turbine systems face challenges in accurately measuring shaft deflection due to movement of the main bearing housing and differences in material response to loads, leading to reduced fidelity of bending moment measurements.
Innovation Solution
A shaft assembly with a non-loadbearing inner body within a cavity of the shaft body, where sensors are coupled to the inner body to detect deflection without being load-bearing, maintaining synchronized rotation and providing physical separation for accurate deflection measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are secured to the main bearing housing to detect shaft deflection, then deflection measurement is enabled, but measurement accuracy deteriorates due to housing movement under load
Solution Approach 1:
The shaft assembly is segmented into two distinct parts: an outer shaft body that carries the load and an inner non-loadbearing body that supports the sensors. This segmentation allows the measurement system to be isolated from load-induced movements, resolving the contradiction between enabling measurement and maintaining accuracy.
Solution Approach 2:
The inner non-loadbearing body acts as an intermediary between the load-bearing shaft and the sensors. It provides a stable reference frame that is not affected by external loads, thereby mediating the measurement process to maintain high accuracy while the outer shaft body experiences the full load.
2Speed
If sensors are directed at a moving surface to measure deflection, then dynamic measurement is enabled, but measurement accuracy deteriorates
Solution Approach 1:
The inner non-loadbearing body serves as a stable intermediary that rotates synchronously with the outer shaft but maintains a consistent reference frame. Sensors mounted on this inner body can accurately measure deflections even during rotation, as the inner body's motion is predictable and synchronized, resolving the contradiction between dynamic measurement capability and accuracy.
3Adaptability or versatility
If different materials are used for supporting and measured components, then design flexibility is improved, but measurement accuracy deteriorates due to differential movement
Solution Approach 1:
The inner non-loadbearing body and the outer shaft body are formed from the same material and exhibit the same degree of movement in response to load. This homogeneity eliminates differential movement between the two components, ensuring that measurements taken relative to the inner body accurately reflect shaft deflection while maintaining design flexibility for material selection.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A main shaft assembly of a wind turbine and method for manufacturing the same are provided. Accordingly, the main shaft assembly includes a structural/shaft body defining a cavity therein. The shaft body is configured to transmit a load of the wind turbine developed in response to the wind. An inner body is located within the cavity. The inner body is non-loadbearing with respect to the load. At least one sensor is coupled to the inner body and positioned within the cavity for detecting a deflection of the shaft body in response to the load.