Search found 45 matches

by KumaraRaja.Eedara
Fri Jul 12, 2019 2:23 pm
Forum: Controls
Topic: questions about reference control input
Replies: 61
Views: 19457

Re: questions about reference control input

Dear Jason, I understand this part of reply from you completely, but, I have one more question: Dear Kamineni, I would say that the angle (about minus z) from the rotor plane to the chord equals pitch + aerodynamic twist. Likewise, I would say that the angle (about minus z) from the rotor plane to t...
by KumaraRaja.Eedara
Tue Jan 02, 2018 6:44 am
Forum: Structural Analysis
Topic: Connection between tower and nacelle
Replies: 4
Views: 2882

Re: Connection between tower and nacelle

Ok, Thanks Jason.
by KumaraRaja.Eedara
Mon Jan 01, 2018 11:54 am
Forum: Structural Analysis
Topic: Connection between tower and nacelle
Replies: 4
Views: 2882

Re: Connection between tower and nacelle

Dear Jason, I'm assuming inner race of yaw-bearing is rigidly attached to the Nacelle and outer-race is rigidly attached to the tower nearly top (ref Fig 01). Strictly speaking, the inner race will have motion relative to the outer race (i.e in xy-plane) due to elasticity of the bearings. It might b...
by KumaraRaja.Eedara
Sun Dec 31, 2017 12:53 pm
Forum: Structural Analysis
Topic: Connection between tower and nacelle
Replies: 4
Views: 2882

Connection between tower and nacelle

Hi, Is it possible to model connection between tower and nacelle (base plate) connection shown in the figure attached herewith. I understand that its revolute joint with rotation about yaw axis. Suppose, wind turbine is locked in a particular position (i.e no yaw is allowed or required),I would like...
by KumaraRaja.Eedara
Mon Dec 18, 2017 1:27 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Not able to delete "pitcntrl.plt"
Replies: 2
Views: 621

Re: Not able to delete "pitcntrl.plt"

Dear Jason,

Your suggestion worked. Thank you!

Regards,
Kumara
by KumaraRaja.Eedara
Mon Dec 18, 2017 1:10 pm
Forum: Computer-Aided Engineering Software Tools
Topic: upwind and downwind turbines
Replies: 7
Views: 5139

Re: upwind and downwind turbines

When I look at the results, I see the same sign for the GenSpeed and Rotspeed? Shouldn't they have opposite in signs (+ , - or -, +) in any simulation?

Regards,
Kumara
by KumaraRaja.Eedara
Mon Dec 18, 2017 7:54 am
Forum: Computer-Aided Engineering Software Tools
Topic: Not able to delete "pitcntrl.plt"
Replies: 2
Views: 621

Not able to delete "pitcntrl.plt"

Hi, I was able to successfully run FAST using Simulink interface (sample files). After the run is completed, 'pitcntrl.plt' is created along with few other files. I'm trying to delete 'pitcntrl.plt' but not able to do so. Because it says "Unable to delete file: "...\pitcntrl.plt" beca...
by KumaraRaja.Eedara
Mon May 22, 2017 9:07 am
Forum: Structural Analysis
Topic: Structural design of the wind turbine blade
Replies: 18
Views: 15420

Re: Structural design of the wind turbine blade

Dear Brian Resor, Can you please email me at kumarraja.e@gmail.com the report and model files of 61.5m blade design. Thanks. I have downloaded 64bit version of NuMad from their webpage but it doesn't has any airfoil info in it. Regards, Kumara Hello, I'd like to advertise the availability of a basic...
by KumaraRaja.Eedara
Sun May 21, 2017 8:33 am
Forum: Computer-Aided Engineering Software Tools
Topic: PreComp help
Replies: 1
Views: 1474

Re: PreComp help

Hi, Xsec_node is defined in the PREComp's user guide Table:5, page num:11. I repeated the same info below for quick reference. Xsec_node: Real array input that identifies locations of sectors on the upper and lower surfaces. The array contains a sequence of values that specify x-coordinates of the s...
by KumaraRaja.Eedara
Sat May 20, 2017 11:14 am
Forum: Structural Analysis
Topic: Definition of parameters
Replies: 20
Views: 9962

Re: Definition of parameters

Dear Jason, Thanks for your quick response. Since the aero-twst and structural twst are defined (as per your reply) relative to blade axis system, I referred to the FAST Manual (page10) for the definition of blade coordinate system. The definition of y-axis of the blade coordinate system is given in...
by KumaraRaja.Eedara
Fri May 19, 2017 2:34 pm
Forum: Structural Analysis
Topic: Definition of parameters
Replies: 20
Views: 9962

Re: Definition of parameters

Dear Jason, strtwst is the angle made by the principal elastic axis with respect to what? similarly aerotwst is the angle made by the chord with respect to what? Also, could you please help me in understanding blade pitch angle. It is just a single value defined for the blade and not defined for eac...
by KumaraRaja.Eedara
Fri Mar 03, 2017 2:53 am
Forum: Computer-Aided Engineering Software Tools
Topic: PRECOMP to BLADED
Replies: 1
Views: 852

Re: PRECOMP to BLADED

Dear Fer,

Did you get any better clarity on this issue.I mean did you figure out about which axis the stiffness calculations are performed in PRECOMP.


Regards,
Kumara
by KumaraRaja.Eedara
Tue Jan 17, 2017 11:53 pm
Forum: Computer-Aided Engineering Software Tools
Topic: FAST theory manual
Replies: 303
Views: 45480

Re: FAST theory manual

Dear Jason,

Could you please send FAST theory manual.
my email id: raja.e@aero.iitb.ac.in
Thanks.

Kumara
by KumaraRaja.Eedara
Mon Jan 02, 2017 9:40 am
Forum: Computer-Aided Engineering Software Tools
Topic: FAST theory manual
Replies: 303
Views: 45480

Re: FAST theory manual

Dear Jason, Thanks for your response. I don't completely understand your response to my second question. I'm used to ADAMS modeling and the relevant theory, where the Differential-Algebraic equations are solved. But since you are saying no constraint equations are written, I'll probably have to go t...
by KumaraRaja.Eedara
Sat Dec 31, 2016 12:55 pm
Forum: Computer-Aided Engineering Software Tools
Topic: FAST theory manual
Replies: 303
Views: 45480

Re: FAST theory manual

Hi, 1) Is there a separate and independent code for ElastoDyn, similar to other modules like "BeamDyn", "TurbSim" which can be run without referring to FAST (using driver file and other input files) ? If yes, please direct me where to download it from? 2) In which module are the ...

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