Search found 11 matches

by Ha.Tran
Thu Sep 15, 2016 3:31 pm
Forum: Computer-Aided Engineering Software Tools
Topic: BModes : Input parameters about tower support subsystem
Replies: 39
Views: 12525

Re: BModes : Input parameters about tower support subsystem

Dear Jason, Thank you very much for your answer. I run Bmodes according to your guide and it works well. I also tried some software to calculate blade cross-section properties. However, the blades I am using are solid. They don't have any shear webs. The results I got didn't include all parameters r...
by Ha.Tran
Tue Sep 13, 2016 7:34 pm
Forum: Computer-Aided Engineering Software Tools
Topic: BModes : Input parameters about tower support subsystem
Replies: 39
Views: 12525

Re: BModes : Input parameters about tower support subsystem

Dear Jason, Thank you very much for your quick and useful response. In this case, I will make tension center coincide with mass center and the principal elastic axes of bending coincide with the principal inertia axes. I hope it will be right. One more problem is that as I run the example "Test...
by Ha.Tran
Mon Sep 12, 2016 6:49 pm
Forum: Computer-Aided Engineering Software Tools
Topic: BModes : Input parameters about tower support subsystem
Replies: 39
Views: 12525

Re: BModes : Input parameters about tower support subsystem

Dear Jason, I am really sorry if I make some inconvenience for you, but I am still confused with the coordinate system to determine structural twist angle, flapwise stiffness and edgewise stiffness in BModes. These following information I read in BModes' s guide: - Str_tw: for a blade, it is the ang...
by Ha.Tran
Sun Sep 11, 2016 6:39 pm
Forum: Computer-Aided Engineering Software Tools
Topic: BModes : Input parameters about tower support subsystem
Replies: 39
Views: 12525

Re: BModes : Input parameters about tower support subsystem

Dear Jason, One more question is about blade-tip mass. In my mind, blade-tip mass is mentioned as a tip brake is used on the blade. Am I thinking correctly? Can you explain me the meaning of this parameter and when should I use this parameter? Thank you very much. I am using Bmodes for the purpose o...
by Ha.Tran
Sun Sep 11, 2016 6:37 am
Forum: Computer-Aided Engineering Software Tools
Topic: BModes : Input parameters about tower support subsystem
Replies: 39
Views: 12525

Re: BModes : Input parameters about tower support subsystem

Dear Jason, I really appreciate your response. It helps me so much to simulate my model accurately. Now, I am having a trouble in determining flapwise and edgewise stiffness of cross-sections of a tidal turbine blade. I read in BModes 's guide. They said that flapwise stiffness is the section flap b...
by Ha.Tran
Thu Sep 01, 2016 10:57 pm
Forum: Computer-Aided Engineering Software Tools
Topic: BModes : Input parameters about tower support subsystem
Replies: 39
Views: 12525

Re: BModes : Input parameters about tower support subsystem

Dear Jason, Now, I can know how to run Bmodes. However, in the blade section property file, I need to supply the geometrical properties of the blade. I can obtain most parameters, except "shear center". I am trying to use PreComp to obtain this parameter. However, the blade I use to experi...
by Ha.Tran
Thu Aug 25, 2016 7:09 pm
Forum: Computer-Aided Engineering Software Tools
Topic: BModes : Input parameters about tower support subsystem
Replies: 39
Views: 12525

Re: BModes : Input parameters about tower support subsystem

Hi Jason, I solved that problem due to your answer. Thank you very much. Now, one more thing is as I run BModes with your example case "Test01_nonunif_blade.bmi", I always encounter the following error: "Running BModes (v1.03.01, 25-Sept-2007, compiled using double precision). Linked ...
by Ha.Tran
Sun Jul 31, 2016 8:49 pm
Forum: Computer-Aided Engineering Software Tools
Topic: BModes : Input parameters about tower support subsystem
Replies: 39
Views: 12525

Re: BModes : Input parameters about tower support subsystem

Hi Jason, I am using BModes for the purpose of gaining the coefficients of the polynomial equation used to model the fore-aft and side-to-side mode shape of the tower in FAST. I have 2 questions for modelling the tower in FAST and BModes. Firstly, in BModes, I am required to place the value of tower...
by Ha.Tran
Fri Jun 03, 2016 10:30 pm
Forum: Tidal Current
Topic: Aerodyn: Some input parameters for unsteady aerodynamic case
Replies: 3
Views: 5893

Aerodyn: Some input parameters for unsteady aerodynamic case

Hi, I am using Aerodyn v15.02 to calculate a horizontal axis tidal turbine in two cases: steady and unsteady. However, I encounter the requirements of providing some input parameters in unsteady aerodynamic case. Specifically, they are: 1. C_nalpha: the slope of the 2D normal force coefficient curve...
by Ha.Tran
Thu Jun 02, 2016 11:41 pm
Forum: Tidal Current
Topic: Harp_opt help
Replies: 19
Views: 15685

Re: Harp_opt help

Hi Mujahid Badshah,

Due to your suggestion, I can run Harp_opt v3 successfully.

I am really happy for this.

Thank you very much.

Best regards,
Ngoc Ha Tran.
by Ha.Tran
Wed Jun 01, 2016 10:08 pm
Forum: Tidal Current
Topic: Harp_opt help
Replies: 19
Views: 15685

Re: Harp_opt help

Hi Danny and Mujahid Badshah, I design a horizontal axis tidal turbine using BEM theory. Now, I try to use Harp_opt v3 for the purpose of optimizing. However, as I run VSFP case, I encounter the following error: Attempted to access WTPoup.rpm(2); index out of bounds because numel(WTPoup.rpm)=0. Erro...

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