RE: Cosine Curve HTURKAK (Structural) 27 May 21 06:37 However, no where in the code does it specify what a, b, and C values area derived from?Ĭan anyone help with this. What I am getting from this is theta is angular coordinate of the point, and a, b, and c are fitting parameters to be estimated. A typical starting point for a computerīest-fit cosine curve is a least-square fit where a, b, and c are chosen to minimize the sum of the square of theĭifferences between measured and predicted elevations. In API 653 it says: Where Elevpred is the elevation predicted by the cosine curve at angle theta. I have read through the entire annex and am pretty understanding of it, though cannot seem to understand how to acquire appropriate predicted elevations. I am in the process of creating a cosine curve for the settlement survey in accordance with API 653 annex B. I have been tasked with performing a complete external visual inspection in addition to an external settlement survey. I am working with a client that has little to no resources when it comes to inspection of their storage tanks.
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