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  • Users: drir
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  1. drir

    Get deformation results in report file or PCL function

    Dear all, I have calculated the deformation of a beam (2D) in Patran/Nastran 2012. I can plot the deformation in Patran but I want to now the exact deformation along the length direction for further analysis in Matlab. How can I do this? Preferably, I would like to have a polynomial that...
  2. drir

    FEM NX7.5: specify load with formula

    Hi, I'm trying to add a load (pressure) on a surface. But I don't want to set a constant value for the pressure. I want to specify the pressure with a formula (polynomial). The dependent value is the z-coordinate. How can I do this in NX7.5? Thanks
  3. drir

    Permeability as a function of gas

    Hi, Can someone tell me why the permeability of a porous material is greater for nitrogen than for air? Thanks
  4. drir

    Cutting force: formula

    Hi, I want to calculate the tangential cutting force Ft. Can someone give me a good reference or the formulas?
  5. drir

    Thermal clamping of a ring: clamping force

    Hi, I want to machine the inside of a copper ring. Therefore, I want to clamp the ring (diameter 25 mm, length 6 mm) around its outside by making aluminium clamping part. By heating the aluminium clamping part, assembling the ring in the clamp and cool down, both are fixed. My question is: how...
  6. drir

    velocity field from pressure distribution

    Hi, I have calculated the pressure distribution over a 2D porous material with the finite difference method. However, now I want to calculate the velocity field or streamlines of the air flowing through this porous material from my pressure distribution. I have thus the pressure value on each...
  7. drir

    Pressure drop plenum chamber

    Hi, How can I calculate the pressure drop of air streaming in a plenum chamber? Thx
  8. drir

    How to add a new material to the library in NX 7.5?

    Hi, I want to add a new, user specific, material to NX 7.5 which I can use for each part I will make in the future without creating it each time. How to do this? I opened the physicalmateriallibrary.xml and phys_material.dat file already with the standard NX materials. However I tried to add a...
  9. drir

    NX 7.5: place balloons manually

    Hi, how can I place balloons manually in a drafting in NX 7.5? Under Insert > Symbol I can only choose 'Custom' or 'Define custom symbol' Thx
  10. drir

    Drafting: dimensions in dotted lines after update of views

    Hi, I'm making draftings of my models in NX 7.5. However, each time I change something in my model and I update my views in drafting mode the line of my dimensions I placed before changes from a solid line to a dotted line. How can I make them solid again without deleting them and place them...
  11. drir

    Hide chamfer lines in drafting

    Hi, I am making drafting of my parts in NX 7.5. However, for some parts I chamfered the edges for a nice look in my assembly but I don't want to see them in my drafting because it overwhelms everything. Is there somewhere a preferences that I can change to hide these double lines? I can also...
  12. drir

    Edit sketch for revolve

    Hi, Long time ago I mad a sketch witch I used for a revolve feature. However, now I have to edit/adapt the sketch because the form of my revolved part must be changed. I opened the sketch with edit and removed some lines of the sketch with trim and closed the curves with extend. I closed the...
  13. drir

    Which error should I calculate?

    Hi, I want to compare (statistically) different models which predict the values y at several x-values. Therefore I want to calculate the 'total error' between the exact (measured) y-values and the calculated y-values using different models. My problem is that I'm not sure which method to use to...
  14. drir

    Solving PDE for slip flow in porous media

    Hi, I'm solving a problem which determines the flow between a porous material and an impermeable material, using the slip-flow boundary conditions as proposed by Beavers and Joseph in '67. I can solve the whole problem as stated below, which gives the velocity 'u' of the fluid in the...
  15. drir

    Where does this equation come from?

    Hi, In a text book I found an equation for the volumetric flow rate of air through a channel (tube). I can't find from where the equation is coming, someone an idea? The equation which I mean is: Q = - pi*d^4/(128*viscosity)* dp/dx I know that Q = A*v = pi*d^2/4 *v Also from the simplified...
  16. drir

    Robust optimization problem

    Hi, For a measurement set-up I'm designing, I have to position two sensors which have to be placed at an angle (alpha, beta) wrt the x-direction (zero degrees). However, there is only one 'optimal' combination of angles (alpha-beta) in words of robustness. In order to determine this 'optimum'...
  17. drir

    Density of air for calculating the mass flow rate from Darcy's law

    Hi, I use Darcy's law to calculate first the volumetric flow rate of air through a porous material. From this I want to calculate the mass flow rate namely the product of the volumetric flow rate and the density. However the density is function of the pressure. Is it right the use the mean...
  18. drir

    Drafting: Load view preferences

    Hi, I have made a lot of draftings on my pc at work. Now I have also a laptop with Nx installed on. I want my view preferences of my draftings from my old pc at work, on my laptop so I don't have to set my preferences again, which will save me a lot of time!! I copied a part which I made on my...
  19. drir

    NX 7.5: problem with assembly

    Hi, I downloaded a part from a website which is drawn in inches but my other drawings and assembly are in metric units. I can assemble the downloaded part, but if I then draw a curve in this downloaded part and open my assembly again, I get the following error message: The work part has been...
  20. drir

    Locating with two diamond locators.

    Hi, I want to locate two parts (with each two holes) very precise with locatings pins. Normally one uses a round locating pin in combination with a diamond shaped pin. However, this set-up only prevents rotation around the round pin. Translation between the two holes is still possible (pitch of...

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