Search found 9 matches

by Julius.Scherf
Fri Jul 17, 2020 11:10 am
Forum: Computer-Aided Engineering Software Tools
Topic: Using Mlife for a lifetime fatigue estimation
Replies: 10
Views: 325

Re: Using Mlife for a lifetime fatigue estimation

Dear Jason,

I'm sorry, I forget to tell you that the ultimate load for the lifetime damage was calculated for RootMMxy1, which was determined as described in the MLife manual.


Best wishes,
Julius
by Julius.Scherf
Fri Jul 17, 2020 11:02 am
Forum: Computer-Aided Engineering Software Tools
Topic: Using Mlife for a lifetime fatigue estimation
Replies: 10
Views: 325

Re: Using Mlife for a lifetime fatigue estimation

Dear Jason, I set the Weibull-Shape factor to 2, so I can assume a Rayleigh wind distribution. Further, I want to determine the lifetime damage for three different mean wind speed values (7.5; 8.5; 10 m/s). The strange thing that I observe is that the ultimate load decreases from 8.5 to 10 m/s. Is t...
by Julius.Scherf
Fri Jul 10, 2020 4:15 am
Forum: Computer-Aided Engineering Software Tools
Topic: Changing TMax to 600s simulation time
Replies: 3
Views: 84

Re: Changing TMax to 600s simulation time

Dear Jason,

thank you a lot. I changed the wind file and I could run the simulation for 600s. :)

Best wishes,
Julius
by Julius.Scherf
Tue Jul 07, 2020 3:40 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Changing TMax to 600s simulation time
Replies: 3
Views: 84

Changing TMax to 600s simulation time

Dear all, Im trying to do a 600s simulation on the 5MW NREL onshore turbine, as needed for the IEC-61400 standard. I'm currently running test 18 with TMAX=60s. If I changed it to 600s the following error occurs(see attachments). Do I have to change some other mode or parameters to perform a 600s sim...
by Julius.Scherf
Tue Jul 07, 2020 3:12 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Using Mlife for a lifetime fatigue estimation
Replies: 10
Views: 325

Re: Using Mlife for a lifetime fatigue estimation

Dear Jason,

thank you. I appreciate your effort.

Best wishes,
Julius
by Julius.Scherf
Mon Jul 06, 2020 4:12 am
Forum: Computer-Aided Engineering Software Tools
Topic: Using Mlife for a lifetime fatigue estimation
Replies: 10
Views: 325

Re: Using Mlife for a lifetime fatigue estimation

Hi Jason, thank you for your quick reply. The Problem concerning the DLC files solved itself. But regarding the S-N curve, I have a question. I understand that I can calculate the number of cycles using equation (2) with L_Ult and L_MF provided by MLife, but I'm not sure about L_i^RF. Can I understa...
by Julius.Scherf
Fri Jul 03, 2020 5:54 am
Forum: Computer-Aided Engineering Software Tools
Topic: Using Mlife for a lifetime fatigue estimation
Replies: 10
Views: 325

Re: Using Mlife for a lifetime fatigue estimation

Hi Jason, I managed to run the mlife_certification_test file provided by mlife. Now I want to adjust the input files in such a manner that I can determine the lifetime of the 5MW NREL turbine for all three cases specified in the IEC-61400 standard. 1. To do so, do I have to modify the DLC data files...
by Julius.Scherf
Thu Jun 18, 2020 1:25 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Using Mlife for a lifetime fatigue estimation
Replies: 10
Views: 325

Re: Using Mlife for a lifetime fatigue estimation

Thank you for your quick reply. That helps a lot.

Best wishes,
Julius
by Julius.Scherf
Thu Jun 18, 2020 10:11 am
Forum: Computer-Aided Engineering Software Tools
Topic: Using Mlife for a lifetime fatigue estimation
Replies: 10
Views: 325

Using Mlife for a lifetime fatigue estimation

Hi everyone, I want to use MLife to determine the fatigue lifetime for the 5MW NREL turbine. So far, I have run test 18 without problems. After reading up in the forum, I've to download MLife to do fatigue estimations, but I can't find the corresponding link. Can somebody help me? Thanks and best wi...

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