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    Join Date
    Apr 2019

    Quick three-dimensional inspection of large wind turbine blades

    The structure, dimensions and process flows of wind turbine blades are the main factors that determine the conversion efficiency of wind energy. Subtle deviations may make the blades resonate and shorten the life cycle of the blades. Therefore, 3D reconstruction of the blades carries a big weight in researching numerical simulation and FEA (Finite Element Analysis).

    What Manufacturer Needs?
    The blade is the most important components for wind turbines to convert wind energy. Correct dimension is vital to ensure stable and efficient operation of the blades. Therefore, the structure characteristics and precision of the blade have very strict requirements.

    There is a batch of wind blade blanks with a volume of 6m1m0.4m. The manufacturer needs to obtain the parameters of the blanks so as to get and eliminate the deviations by comparing with the standard devices. The traditional measurement methods, however, are difficult to detect and time-consuming with inevitable manual errors. As a result, an efficient and accurate 3D inspection method is being sought.

    ScanTech 3D Solution
    In order to improve the scanning rate and efficiency, ScanTech uses HSCAN771 3D scanner with 7 red laser crosses (1 extra red laser) to detect the large wind turbine blade. However, the blade sizes up to 6m, the errors will continue to accumulate during the whole 3D scanning process, which will terribly reduce the accuracy.

    As the blade has a very strict requirement in high precision, our technical professionals will combine HSCAN771 3D scanner with MSCAN Photogrammetry System to handle it. The mutual work of HSCAN 3D scanner and MSCAN will increase the accuracy by 67% and greatly reduce the deviations of volumetric accuracy. This kind of combination method will make full use of its advantage when scanning larger workpieces.

    Scanning Process
    Step 1: attaching reflective markers and coding points

    Step 2: use the MSCAN photogrammetry system to capture the markers and code points with different angles.

    Step 3: scan the blade by HSCAN771 3D scanner and obtain 3D data.

    Step 4: import the 3D data to 3D software ScanViewer and save the data file in common output formats such as iges and stl.

    Step 5: fit and align the 3D model and CAD model.

    Step 6: modify the deviations and optimize product development based on contrast detection.

    Time Cost
    Attaching markers: 8 minutes

    Scanning: 15 minutes

    Generate inspection report: 5 minutes

    MSCAN photogrammetry system is usually used for measuring and locating large objects. On the one hand, it can collaborate with HSCAN 3D scanner to effectively reduce the cumulative errors. On the other hand, MSCAN system can be used for 3D inspection of large workpieces individually to detect product size, geometric deformation, etc.

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