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  • Users: peglor
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  1. peglor

    Grid Independence checks

    I have a ProMech model that seems to give me the same displacement at several grid refinements, but gives quite drastically varying peak stresses. The stresses are linked to point features, but the behaviour of the model at these points is of interest for the results. I get the feeling that I...
  2. peglor

    Finding the Average Temperature of a Surface

    Is it possible to get ProMechanica WF2 to calculate the average temperature of a surface in a thermal model? I'm trying to extract an equivalent thermal conductivity for a multi-material model (Standard resistance network techniques aren't valid as there is side conduction as well as parallel...
  3. peglor

    ANSYS/LS-DYNA Memory Error

    Can someone help with the following error message for ANSYS/LS-DYNA? Bearing in mind that: I have 1GB of memory. I increased it yesterday from 512MB and the error message has not changed. I have also tried changing the memory settings, reducing the database memory and increasing the total...
  4. peglor

    Part colours association with assembly ProE2001

    I'm wondering how the colours are associated with parts in ProE 2001 assemblies? - I'm asking because I have the following problem: When I draw a part and assign it a colour it remains that colour. When I assemble the part to an assembly it is uploaded with the assigned colour. When I change...
  5. peglor

    Inlet/Outlet Loss due to sharp edged contraction

    This is a question that was put to me for which I can't find a satisfactory answer. Any fluids book will tell you that the pressure drop due to a sudden contraction or expansion is found by: PL = KL*rho*u^2/2 PL=Pressure Drop KL=Loss coefficient rho=fluid density u=fluid velocity KL is...
  6. peglor

    Strange Error Message

    I'm running a program in Matlab at the moment and I'm getting the following error: ??? Unable to find subsindex function for class char. The error is at an input statement of the following syntax: a=input('\n Text'); Even stranger than that is that the program executed this line perfectly the...
  7. peglor

    Extracting trendline equation information to be used in Excel calculat

    I'm wondering whether it is possible to take values from the equation Excel calculates for trendlines in a graph and use them in other calculations. I can copy and paste the values as text, but if the graph changes, my copied values do not update. Even getting the contents of the equation text...
  8. peglor

    To Select Items which can't be clicked on in Excel Graphs

    Here's one I discovered recently. It makes things a lot easier while working with graphs where the points fit a trendline too closely. If excel won't allow you to select the points on the graph with the mouse, select the trendline, hold down the CTRL key and use the right and left arrow keys to...
  9. peglor

    Plane Stress/Strain

    Hi all, I'm wondering what are there guidelines to use in order to decide whether a 2D model should be run as a plane stress or a plane strain model. I have results from FE runs using both options and I'm wondering which is more correct. The model is a socket in contact with a nut. The nut is...
  10. peglor

    Shell to Solid Links in ProM

    Is there an easy way to link shells and solids in a ProM model? I'm trying to build a model which contains a mixture of solids and shells but ProM won't run it, saying it's inadequately constrained. This inadequacy, I'm guessing, is due to there not being links between the shells of one part of...
  11. peglor

    Gaps between Extruded surfaces in ProE

    I'm currently working on a simplified model of a cylinder with angle irons welded around its circumference. A basic drawing is available here: http://www.csn.ul.ie/~ceason/proeng/cylinder.jpg The cylinder is made by extruding a trimmed circle to make the first surface. The angle irons were...
  12. peglor

    Line Thickness in printing ProE Drawings

    Is there a setting you can use to adjust the thickness of the lines in printed drawings from ProE? I've got a few drawings missing out on fine detail because the visible lines are so thick they obscure smaller details. The printer can print much thinner lines than ProE is using (It's a LASER...
  13. peglor

    Changing Part shape in Animation Mode

    Is it possible to make a part change shape during a ProE animation? My current application is to make a spring compress as the parts around it move. There doesn't seem to be the option to vary parameters and dimensions during an animation. All help and suggestions will be greatly appreciated.
  14. peglor

    Modelling Thermal Interface between two parts

    I'm trying to model the thermal bahaviour of an assembly of solid parts. A heat flux is applied to one surface and there is a convection condition from surfaces on another part in contact with it. The problem is in reality there isn't complete thermal contact between the two parts. The parts...
  15. peglor

    Visual Basic

    Where do people recommend I look to find useful tutorials in Visual Basic on the Web/Elsewhere? I don't know if this is the right forum to use, but since many people posting to it are writing macros in Visual Basic and my main reason for learning Visual Basic is to program macros, I'm hoping...
  16. peglor

    High aspect Ratio parts in ProMechanica Thermal

    I'm wondering what the best way is to model thermal bahaviour in a very long thin channel with heaters fitted outside it using ProMechanica. The channel is about 300microns by 400 microns by 30mm in size. Fluid speeds will be very low through the channel, so the fluid in the channel is being...
  17. peglor

    Parts that are Mirror images of eachother

    I'm currently designing a pair of pressure tapping manifolds which are mirror images of eachother. I can create one part from the other by mirroring it through one of its faces and cutting the original part away. This gives me the correct geometry, but changes in one part will not be reflected...
  18. peglor

    Correlating data to a given curve

    Has Excel a built in function to calculate the level of correlation between a set of data points and a given equation or other set of points? Since the trendline function for the graphs will already give the correlation coefficient between a given set of data points and a best fit trend line...
  19. peglor

    Thermocouple Specification

    I've spent the last few weeks unsucessfully looking for a decent guide on the selection and the fitting of thermocouples to take measurements from a system. I am looking for a means of collecting both surface temperatures for a block of Aluminium heated by power resistors and fluid temperatures...
  20. peglor

    Length of pipe as a parameter - saving toolbar config

    I'm currently working on a model which uses pipes made by joining datum points with a mix of splines and straight lines. If I look up the info list for the pipe it will tell me the length of each piece of the pipe, as well as the total length of the pipe. I now want to make the pipe a certain...

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