Search found 37 matches

by Purushotham.Chinu
Thu Mar 09, 2017 1:02 am
Forum: Computer-Aided Engineering Software Tools
Topic: Free decay analysis and natural frequency
Replies: 49
Views: 12085

Re: Free decay analysis and natural frequency

Dear jason, I am trying to conduct free decay test using fast by your said procedure i am setting the wavemod to 0 and also ensuring that there is steady wind or uniform wind supply and i also gave displacements for platforms in the elastodyn file, but i am getting the following error http://farm3.s...
by Purushotham.Chinu
Sat Mar 04, 2017 7:21 am
Forum: Computer-Aided Engineering Software Tools
Topic: Free decay analysis and natural frequency
Replies: 49
Views: 12085

Re: Free decay analysis and natural frequency

Dear Jason, Thank you for quick reply, what could be the reason for noisy responses in pitch and roll, and is there a means of filtering the responses in fast and also jason the peaks correspond to natural frequency rite , so is it accurate to assume the one corresponding to the highest peak would b...
by Purushotham.Chinu
Fri Mar 03, 2017 5:03 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Free decay analysis and natural frequency
Replies: 49
Views: 12085

Re: Free decay analysis and natural frequency

Dear Jason,
I would just like to know your comments on the zoomed in frequency responses i have sent you a pic of.


regards
by Purushotham.Chinu
Fri Mar 03, 2017 7:40 am
Forum: Computer-Aided Engineering Software Tools
Topic: Dynamic Analysis of offshore wind turbine on triceratop floating platform
Replies: 25
Views: 5997

Re: Dynamic Analysis of offshore wind turbine on triceratop floating platform

Dear Jason, I have fixed that problem now, kindly reply to my post on free decay test and natural frequency also jason i would like to how accurate is my frequency response, And also jason how can i represent the effect of the platform on the wind turbine tower graphically, i mean what parameters ca...
by Purushotham.Chinu
Fri Mar 03, 2017 6:33 am
Forum: Computer-Aided Engineering Software Tools
Topic: Free decay analysis and natural frequency
Replies: 49
Views: 12085

Re: Free decay analysis and natural frequency

Dear Jason, In regards to the topic i coudlnt find your post where you have given ways to calculate eigen natural frequencies, also jason, i would like to know whether fast directly gives the natural frequencies subject to various conditions or is there a way to do this(in parked and unparked condit...
by Purushotham.Chinu
Thu Mar 02, 2017 8:04 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Dynamic Analysis of offshore wind turbine on triceratop floating platform
Replies: 25
Views: 5997

Re: Dynamic Analysis of offshore wind turbine on triceratop floating platform

Dear Jason, After following your advice the simulation ran for greater than 1000 seconds but stopped at 1149 seconds showing the following output http://farm4.staticflickr.com/3763/32374029584_0be735fa5f_b.jpg and the corresponding turbsim input is [img]blob:https://www.flickr.com/09d8108e-db85-4854...
by Purushotham.Chinu
Thu Mar 02, 2017 5:31 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Free decay analysis and natural frequency
Replies: 49
Views: 12085

Re: Free decay analysis and natural frequency

Dear jason, I am sending the zoomed pictures of the responses in the following figures http://farm1.staticflickr.com/741/33059565272_4071b3fd35_b.jpg http://farm1.staticflickr.com/579/32401492463_bac5b9459e_b.jpg http://farm4.staticflickr.com/3921/32372068024_64d84eb652_b.jpg Kindly go through it an...
by Purushotham.Chinu
Thu Mar 02, 2017 8:36 am
Forum: Computer-Aided Engineering Software Tools
Topic: Free decay analysis and natural frequency
Replies: 49
Views: 12085

Re: Free decay analysis and natural frequency

Dear jason, In follow up to my above question, i would just like to share my frequency responses, i have simulated it for 600 seconds and carried out a fft in matlab [img]blob:https://www.flickr.com/d76c95b7-cf21-4439-b612-952cb4dfff58[/img] http://farm4.staticflickr.com/3825/33080369021_5c4a09ed20_...
by Purushotham.Chinu
Thu Mar 02, 2017 8:18 am
Forum: Computer-Aided Engineering Software Tools
Topic: Free decay analysis and natural frequency
Replies: 49
Views: 12085

Free decay analysis and natural frequency

Dear Jason, I would just like to know how to carry out free decay test in all six degrees of freedom in fast for a floating platform such as a tlp,and also how can i find out the natural frequency of the system in all 6 degrees of freedom through fast, how is it possible to do so,also jason i went t...
by Purushotham.Chinu
Thu Mar 02, 2017 8:09 am
Forum: Computer-Aided Engineering Software Tools
Topic: Dynamic Analysis of offshore wind turbine on triceratop floating platform
Replies: 25
Views: 5997

Re: Dynamic Analysis of offshore wind turbine on triceratop floating platform

Dear Jason, [code][/coddde] FAST is crashing it is showing stack overflowing, forrt1:severe(170),it is showing pc is not recognised as a internal or external command [img]/http://farm4.staticflickr.com/3876/33079985161_4a0142503b_b.jpg[/img] Kindly follow the above link,kindly reply as soon as possi...
by Purushotham.Chinu
Thu Mar 02, 2017 4:15 am
Forum: Computer-Aided Engineering Software Tools
Topic: Dynamic Analysis of offshore wind turbine on triceratop floating platform
Replies: 25
Views: 5997

Re: Dynamic Analysis of offshore wind turbine on triceratop floating platform

Dear jason, When i am trying to simulate my test case for 1200 seconds, at 1000 seconds it shows stack overflow at 16:39 54(program exception) and it lists up four columns with titles image,pc, line, routine,source,kindly let me know as soon as possible, how i can overcome this difficuty, kindly rep...
by Purushotham.Chinu
Tue Feb 28, 2017 5:38 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Dynamic Analysis of offshore wind turbine on triceratop floating platform
Replies: 25
Views: 5997

Re: Dynamic Analysis of offshore wind turbine on triceratop floating platform

Dear jason, Thanks a million times, now it is running for 600 seconds,if i want to change the wind direction is it sufficient if i change the propagation direction in the turbsim input file which i will be calling in the inflow wind, also jason while changing the direction of wind should we also tak...
by Purushotham.Chinu
Tue Feb 28, 2017 8:20 am
Forum: Computer-Aided Engineering Software Tools
Topic: Dynamic Analysis of offshore wind turbine on triceratop floating platform
Replies: 25
Views: 5997

Re: Dynamic Analysis of offshore wind turbine on triceratop floating platform

Dear jason, Even after following your guidelines my arra y terminates at 16 seconds , my turbsim input for turbine is -Turbine/Model Specifications----------------------- 20 NumGrid_Z - Vertical grid-point matrix dimension 20 NumGrid_Y - Horizontal grid-point matrix dimension 0.01 TimeStep - Time st...
by Purushotham.Chinu
Mon Feb 27, 2017 5:00 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Dynamic Analysis of offshore wind turbine on triceratop floating platform
Replies: 25
Views: 5997

Re: Dynamic Analysis of offshore wind turbine on triceratop floating platform

Dear Jason, I guess what you are trying to say that my turbsim file is incompatible with the aerodyn file of my model, i am sending my aerodyn input and wind input file, kindly tell me what is wrong with it as i tried a lot but not achieving any success. AEODYN INPUT FILE ------- AERODYN v15.03.* IN...
by Purushotham.Chinu
Mon Feb 27, 2017 7:30 am
Forum: Computer-Aided Engineering Software Tools
Topic: Dynamic Analysis of offshore wind turbine on triceratop floating platform
Replies: 25
Views: 5997

Re: Dynamic Analysis of offshore wind turbine on triceratop floating platform

Dear Jason, As guided by you i have generated the wind file by turbsim but now i am getting a different error, saying that FFWind_calcoutput[position=(0,0,0) in wind file coordinates: FF wind array boundaries violated. grid too small in z direction(z=0) is below the grid and no tower points are defi...

Go to advanced search