# OpenFAST: Linearization of NREL 5MW Onshore Turbine

**URL:** <https://forums.nlr.gov/t/openfast-linearization-of-nrel-5mw-onshore-turbine/2573>\
**Category:** Computer-Aided Engineering Software Tools\
**Created:** [October 11, 2021, 7:16pm UTC](https://forums.nlr.gov/t/openfast-linearization-of-nrel-5mw-onshore-turbine/2573 "2021-10-11T19:16:51Z")\
**Posts on this page:** 1\
**Showing post:** 29

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**Author:** ![Jason.Jonkman](https://dub1.discourse-cdn.com/nrel/user_avatar/forums.nlr.gov/jason.jonkman/32/3086_2.png) [@Jason.Jonkman](https://forums.nlr.gov/u/Jason.Jonkman)\
**Post date:** [January 20, 2022, 1:39pm UTC](https://forums.nlr.gov/t/openfast-linearization-of-nrel-5mw-onshore-turbine/2573/29 "2022-01-20T13:39:51Z")

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Dear Dezheng.Zhu,

A similar question was asked and answered in the following forum topic: [FAST\_v8.15 OutList parameters - #2 by Jason.Jonkman](http://forums.nlr.gov/t/fast-v8-15-outlist-parameters/1347/2).

If the generator or drivetrain DOFs are enabled in ElastoDyn, I would expect large differences in the derivatives calculated from a linearization analysis between RotPwr from ElastoDyn and RtAeroPwr from AeroDyn because the former is effected by rotor acceleration/deceleration while the later is not. If the generator and drivetrain DOFs are disabled in ElastoDyn, then I would expect quite good agreement between the two.

Best regards,

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