# Validation of Linear System

**URL:** <https://forums.nlr.gov/t/validation-of-linear-system/1693>\
**Category:** Controls\
**Created:** [September 13, 2017, 4:33pm UTC](https://forums.nlr.gov/t/validation-of-linear-system/1693 "2017-09-13T16:33:47Z")\
**Posts on this page:** 1\
**Showing post:** 5

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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:** [October 2, 2017, 12:50pm UTC](https://forums.nlr.gov/t/validation-of-linear-system/1693/5 "2017-10-02T12:50:26Z")

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Dear Syed,

As discussed in the following forum topic: [FAST linearization V7](http://forums.nlr.gov/t/fast-linearization-v7/1680/1), once you linearize the FAST model, apply MBC3, and azimuth-average the resulting matrices, you’ll end up with a linear state-space model without the azimuth state. Thus, when comparing the linear and nonlinear models, I would suggest applying MBC3 to the result of the nonlinear model in order to compare to the result of the linear model.

Best regards,

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