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  1. Kanwarosama

    CALCULATION OF THRUST FORCE

    Hi jhardy1, This is the same interpretattion that i have.
  2. Kanwarosama

    CALCULATION OF THRUST FORCE

    This here is more clear
  3. Kanwarosama

    CALCULATION OF THRUST FORCE

    Hi, Please have a look at the results from Abaqus regarding deflection and other aspects.
  4. Kanwarosama

    CALCULATION OF THRUST FORCE

    Yes, they have been built and they are under operation.
  5. Kanwarosama

    CALCULATION OF THRUST FORCE

    But then the question would arise that if tower is such ruggedly built why it displaces like 3 meters or so. I mean if based on structural engineering, this is very very huge. I know that when I tell someone this they always say its not possible and i also believe it so. Also the ooperator told...
  6. Kanwarosama

    CALCULATION OF THRUST FORCE

    Hi, Thank you all for your nice commemts. Bit Gr8blu, I have asked the operator that what kind of deflection they usually get, i got the answer that its about something less than a meter even when the full load is on. Also I want to test my model for very extreme situation, which will cause...
  7. Kanwarosama

    CALCULATION OF THRUST FORCE

    My structural model is that there is the tower which has diameter of about 6.5 m at base and 3.5 meters at top. Thickness about 45 mm at bottom and 18 mm at top Yes, its tapering as well. The deflection calculation i did theough fem and simplified by hand. Both match reasonably. So I am sure if...
  8. Kanwarosama

    CALCULATION OF THRUST FORCE

    Yes, I understand this. I have the fem model which I built from an already exisiting wind turbine. The fem model has the tower but not the blades. The model works fine for modes of vibration, etc but just this deflection is a problem. 800 kN also sounds reasonable but thats what i dont...
  9. Kanwarosama

    CALCULATION OF THRUST FORCE

    I am using air density as 1.25 kg/m3.
  10. Kanwarosama

    CALCULATION OF THRUST FORCE

    Hi, I have a mast that is 150 meters, the diameter of rotor is 162 m, the thrust coefficient is 0.635 and wind speed is 10 m/sec. Now, by the equation T= 1/2* density of wind*area of rotor*thrust coeffcient* speed of wind^2. So I get around 800 by this. Applying such huge force obviously...
  11. Kanwarosama

    CALCULATION OF THRUST FORCE

    HI, I am doing a project where i need to provide to do the structural anlysis of a wind turbine tower. For this purpose, I calculated the thrust force using the actuator disk theory. The problem with this is it provides me a huge point load of 800 kN. and when i apply this load on the tower it...
  12. Kanwarosama

    Joint Flexibility Huth, Grummann Formulas

    Hi, I was working on preloaded flange connections of wind turbine towers, trying to model them in abaqus. I need the axial and the shear stiffnesses of the joint. For the shear its the Huths formula that I am thinking of using. But I dont understand what is the effect of number of bolts on this...
  13. Kanwarosama

    Surface to Surface Contact- Cohesive Behavior

    Hi, I am trying to simulate the Preloaded flange bolted connection similar to the one in wind turbine towers. I am using the cohesive behavior to model the surface to surface contact where I need to provide knn, kss and ktt for the cohesive behavior. I have tried reading the abaqus manual for...
  14. Kanwarosama

    Flange-bolt joint, Abaqus, wind turbine tower

    The modes of frequency that I get from using cartesian and springs are almost same. First three as rigid body and afterwards some values which dont seem right.https://files.engineering.com/getfile.aspx?folder=79d232c0-d61c-42b0-8976-50913502230c&file=IMG_5176.jpeg
  15. Kanwarosama

    Flange-bolt joint, Abaqus, wind turbine tower

    This is what the whole model looks like. I think the fix boundary condition cannot be actually removed as this is considered that the foundation provides a complete restraint to all degrees of...
  16. Kanwarosama

    Flange-bolt joint, Abaqus, wind turbine tower

    Here I will attach a spring model assembly between two sections.https://files.engineering.com/getfile.aspx?folder=3bb3dee3-3048-46c2-867b-42fc18861669&file=IMG_5173.jpeg
  17. Kanwarosama

    Flange-bolt joint, Abaqus, wind turbine tower

    Hi, The tower model will be verified by the modes of frequency provided by the manufacturer. When I used a tie constraint between the tower section, i got very close to the actual modes. So, my assumption is that if i use a connector element which behaves like a bolt (as this is the actual...
  18. Kanwarosama

    Flange-bolt joint, Abaqus, wind turbine tower

    Thank you for your quick response. I have tried using cartesian connectors along the circumference of the sections. First I created a set of attachment points then I used tie to fix them to the tower sections on each ends. Then i used a very high stiffness of the cartesian in three directions...
  19. Kanwarosama

    Flange-bolt joint, Abaqus, wind turbine tower

    Hi all, I am trying to model a wind turbine tower. I was successful in modelling the geometry and thickness but I am stuck when it comes to connections which are flange-bolt type. I can simplify my problem by totally eliminating the need to model the flange and bolt and use the tie constraint to...

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