ED: Implemented the ability to add concentrated masses to the tower #2953
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Feature or improvement description
This PR adds the ability to prescribe concentrated masses for the tower in ElastoDyn for convenience. Note that this is based on an approximated formulation where each concentrated mass is evenly spread over the discretized tower element it is located on. To more accurately localize the additional mass on the tower, finer tower discretization (increased
TwrNodes) in the primary ElastoDyn input file is necessary.A list of concentrated masses for the tower can be specified at the end of the ElastoDyn tower input file in an optional section that comes after TOWER SIDE-TO-SIDE MODE SHAPES. An example with two concentrated masses (
NTwCMass= 2) on the tower is shown below. The height fractionHtFractmust be in the range of [0,1], and the massTwCMassmust be non-negative. The entries do not have to follow any particular order, and multiple entries can be assigned to the sameHtFract.If this optional section is omitted, no concentrated mass is included, allowing existing ElastoDyn input files to work as normal.
Impacted areas of the software
ElastoDyn
Test results, if applicable
No change to existing input files or test results. No verification was performed. However, through the ElastoDyn summary file, it is confirmed that the addition of concentrated masses does modify the total tower mass and the local tower node mass density correctly.