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  1. TEIF-RO

    How to do a reccurent substitution in a symbolic matrix in matlab withor the ''FOR'' loop?

    @Greg Locock Honestly I did not get what you said could you please give me the Matlab code you used to get your answer? My problem here is not the answer but how to get k for each value of Z without the loop. Kindly send me the code Thanks TEIF
  2. TEIF-RO

    How to do a reccurent substitution in a symbolic matrix in matlab withor the ''FOR'' loop?

    Hi I have this symbolic 2x2 matrix in Matlab. z is A Symbolic variable k(z)= [ z+1, z^2; exp(z), z^3]. I need a value of k(z) for z=1:N How to do this without a loop '' FOR'' Thanks
  3. TEIF-RO

    obtaining a NORMALISED POWER SPECTRUM DENSITY

    Hi EVERYONE Attached is the SIGNAL in FIGURE 1 its Power Spectral Density( PSD ) in FIGURE 2 as well as the matlab code to get FIGURE2. How will I get the Normalised Power Spectral Density of FIGURE 3? what to add in the matlab code? its a dynamic response of a wind turbine Thanks...
  4. TEIF-RO

    Hoew to connect a nonlinear visco damper to a flange

    Thanks once more for your reply!!! I used RPs for flanges and it kept showing me this message: ''2 nodes are missing degree of freedoms. The MPC/Equation/kinematic coupling constraints can not be formed. The nodes have been identified in node set ErrNodeMissingDofConstrDef'' Till I have decided...
  5. TEIF-RO

    Hoew to connect a nonlinear visco damper to a flange

    @ FEA way Thanks for your reply. I tried to do exactly what you explained but THE problem is, The point belonging to a connector must be tied to a connector(as we did with flange). Now I DON'T REAALY now how to tied a point to a connector!! Any suggestion should be welcomed!!!
  6. TEIF-RO

    Hoew to connect a nonlinear visco damper to a flange

    Hi Everyone I want to connect a visco damper(VD) on the steel-made flange of a tower in ABAQUS. The VD is modelled USING CONNECTORS. The connectors was linked to a flange using the RP (which are tied to a flange) as per the pictur attached. Im not getting the expected results. Now from a...
  7. TEIF-RO

    How to model a viscous damper in abaqus using nonlinear dashpot element?

    @Erik Panos Kostson (Structural) Just to have the full understanding of the following lines concerning nonlinear damper *Dashpot, elset=Springs/Dashpots-1-dashpot, nonlinear -0.001,-10 0.001,10 0.002,20 0.003,30 0.004,40 0.004,1000 Is the first COLUMN force? if yes whats the unit(F)? Is the...
  8. TEIF-RO

    How to model a viscous damper in abaqus using nonlinear dashpot element?

    I went into the manual but, This code was useful as well. Its showed me how to edit an imput file by inserting nonlinear damper Thanks a lot!!!
  9. TEIF-RO

    How to model a viscous damper in abaqus using nonlinear dashpot element?

    I want to use the viscous damper in abaqus. I firstly used spring/dashpot but it didn't work. Now I realized the best way is to uses the nonlinear dashpot element. Can someone explain me how to do it? Thanks
  10. TEIF-RO

    COUPLIND-TMD-IN -ABAQUS

    @ FEA way thanks for explanations!!! I did exactly what you said and it worked!!
  11. TEIF-RO

    COUPLIND-TMD-IN -ABAQUS

    Hi I want to mount a TMD (m,k,c) on my beam-like structure in Abaqus. The beam has a mass at its top(point mass in abaqus). Practically, a tmd should be placed inside the top mass. Its seems impossible to do this as the top mass here is a point!!! Should a TMD mass be also a point mass? if yes...
  12. TEIF-RO

    Looking for A DOF of Coupling (rotational-translational spring)

    attached the paper using ithttps://files.engineering.com/getfile.aspx?folder=35e38144-9bf8-4b5e-b68b-e056733ff16f&file=klr.pdf
  13. TEIF-RO

    Looking for A DOF of Coupling (rotational-translational spring)

    Element, type=Spring1, elset=Springs/Dashpots-KRL-spring KLR is cross coupling (lateral-rotational) stiffness of slender pile for homogeneous soil. For example the DOF of KL and KR here are 1 and 6 respectively. Whats KLR DOF?
  14. TEIF-RO

    Looking for A DOF of Coupling (rotational-translational spring)

    https://res.cloudinary.com/engineering-com/raw/upload/v1554422648/tips/DOF-OF-SPRINGS_el9291.docx
  15. TEIF-RO

    Looking for A DOF of Coupling (rotational-translational spring)

    Can you please tell me what DOF should be chosen for KLR spring in ABAQUS as per the attached ?
  16. TEIF-RO

    Negative cross-coupling spring in ABAQUS

    I activated. and thanks.
  17. TEIF-RO

    Negative cross-coupling spring in ABAQUS

    THANKS Its shows me ''Open PowerShell window here'' INSTEAD
  18. TEIF-RO

    Negative cross-coupling spring in ABAQUS

    Please can you give the steps to run it through commands? I'm new in this Thanks
  19. TEIF-RO

    Negative cross-coupling spring in ABAQUS

    1-I OPENED THE .inp file generated by my model using Textpad. 2-I modified and saved then I imported it in CAE and ran it. my spring is not non linear its a cross-coupled spring(In fact it's a cross-coupling stiffness KLR for slender piles in an homogeneous soil)
  20. TEIF-RO

    Negative cross-coupling spring in ABAQUS

    @FEA WAY.I opened the .inp file and added the negative value then save it. but when I run the model an re-opened the .inp file, the added value was no more there plus my results remained unchanged. So it did nor work

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