Wind Turbine Blade Base Excitation Testing
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Solution Overview
Problem
Current wind turbine blade testing methods are time-consuming, expensive, and inefficient, particularly for larger blades, as they require sequential testing in multiple directions and rely on complex and costly hydraulic systems, limiting the ability to simulate real-world loads and delaying the implementation of new blade designs.
Innovation Solution
A multi-axis degree of freedom blade testing system that utilizes base excitation to simultaneously oscillate wind turbine blades in multiple directions, reducing testing time and costs by applying forces through a pivotally mounted blade support and excitation input assembly with actuators operating at different frequencies, allowing concurrent flapwise and edgewise testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sequential single-axis fatigue testing is used for large blades, then testing accuracy is maintained, but testing time increases to three to twelve months per direction and facility size becomes very large
Solution Approach 1:
The patent combines multiple single-axis testing operations into a single multi-axis testing system. The blade support structure is mounted to move simultaneously in flapwise, edgewise, and lead-lag directions, allowing all fatigue tests to be performed concurrently on one blade rather than sequentially, reducing testing time from months to days while maintaining accuracy through controlled multi-directional loading
Solution Approach 2:
The testing system transitions from static sequential positioning to dynamic simultaneous multi-axis motion. The blade support structure incorporates actuators and linkages that enable coordinated movement in multiple degrees of freedom, allowing the blade to experience realistic combined loading conditions that occur during actual wind turbine operation
2Force
If large hydraulic systems are used for testing large blades, then sufficient loading capacity is achieved, but system complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex hydraulic loading systems with a mechanically advantageous linkage system. The blade support structure uses levers, linkages, and pivot points to amplify actuator forces and achieve the required loading capacity for large blades, eliminating the need for large hydraulic pumps, valves, and fluid management systems while reducing overall system complexity
Solution Approach 2:
The system adds vertical dimension to the testing apparatus by mounting the blade support structure on an elevated platform or tower. This allows gravity to assist in applying downward loads on the blade while actuators provide controlled upward forces, effectively using the vertical dimension to reduce the mechanical work required from the actuators and simplifying the force generation system
3Reliability
If advanced fatigue testing is performed on proposed blade designs, then design validation is improved, but implementation time is significantly delayed
Solution Approach 1:
The patent performs preliminary multi-axis fatigue testing on prototype or proposed blade designs before full-scale manufacturing and deployment. By validating design assumptions and identifying potential failure modes early in the development process through accelerated multi-directional loading, the system prevents costly redesigns later and speeds up the overall implementation timeline despite the intensive testing performed
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 significantly reduces the time and cost of fatigue testing while providing accurate results, enabling faster implementation of new blade designs and allowing for more efficient testing of larger blades without the need for large, complex hydraulic systems.
Implementation Method 1
an actuator adapted to provide forcing functions in one or more directions to oscillate a base of an attached blade
Implementation Method 2
The loading apparatus is attached directly or through compliant linkages to the blade... to oscillate the blade or test article
Data Source
AI summary
An apparatus (500) for fatigue testing elongate test articles (404) including wind turbine blades through forced or resonant excitation of the base (406) of the test articles (404). The apparatus (500) includes a testing platform or foundation (402). A blade support (410) is provided for retaining or supporting a base (406) of an elongate test article (404), and the blade support (410) is pivotally mounted on the testing platform (402) with at least two degrees of freedom of motion relative to the testing platform (402). An excitation input assembly (540) is interconnected with the blade support (410) and includes first and second actuators (444, 446, 541) that act to concurrently apply forces or loads to the blade support (410). The actuator forces are cyclically applied in first and second transverse directions. The test article (404) responds to shaking of its base (406) by oscillating in two, transverse directions (505, 507).