Jump to content

karl landet

Members
  • Content count

    6
  • Joined

  • Last visited

About karl landet

  • Rank
    Newbie

Profile Information

  • Country
    France
  • Are you University user?
    Yes

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. karl landet

    Eigenvalue along normal direction of surfaces

    Thank you for your help. But your expression doesn't work. I take time to understand how work the builder expression (from "Derived Results") and I did some corrections : Dot(BCElemToNode(ElementAxisVector("0.0 0.0 1.0","LC0F1.Elements","R1.LC0F1.V1","Bisect"),"avg","LC0F1.Elements"),"R1.V2") R1.LC0F1.V1 : Coordinates R1.V2 : Eigen mode BR Karl
  2. karl landet

    Eigenvalue along normal direction of surfaces

    I work on the acoustic optimization of gearboxes. I will do some measure in few months. I need to determine an optimal placement of my sensors to see my modal shapes. My sensors are 1D accelerometers (normal direction). To compute a good placement of my sensors I need a matrix (lines: modal basis; columns: my nodes) and the values in this matrix are the Eigen value along normal direction (because I have 1D accelerometers). With this matrix I can do a QR decomposition or a Monte Carlo method (where I select the smaller conditioning of the computed sub-matrix) to determine a good placement. Also I need these Eigen values to do a spectral iterative computation to get the dynamic response of my gearbox where I take account the non-linearity of my excitatory effort, transmission error, etc. Ok thank you I will try this week BR Karl
  3. karl landet

    Eigenvalue along normal direction of surfaces

    Yes I know that I'm speaking about nodes... and a node it's not a surface ... but values are define at nodes ... Normal to what ? As I said in my first message " their local surfaces ", It's not possible ? I don't know ... maybe it's possible to use the nearest element normal vector ? Or a mean of nearest element normal vector? To do my computation I need each value along its nearest normal vector... So, there is a mean to extract values along normal vector of local surfaces ?
  4. karl landet

    Eigenvalue along normal direction of surfaces

    Yes I checked. But it plot vectors in function of its global system (see "My_housing.jpg"). I would like something like my first picture called "Normal.jpg". BR Karl
  5. karl landet

    Eigenvalue along normal direction of surfaces

    ok, but how can I make 170 000 different local coordinate systems, 1 per node, where one of three axis is the local normal vector ? I need to extract values along normal vectors for each node of my gearbox' housing. If it's not possible in HV or HM. How can I extract normal vector's coordinates for each node ?
  6. Hi, I performed a modal analysis on a train gearbox with complex geometry, I obtain values for 170 000 nodes and I need to see or export eigen values of nodes along normal direction of their local surfaces. I saw in contour panel that it possible to display the magnitude or values along of x, y and z axis, but, I would like know if it's possible to display values (like eigen value or displacement) along normal direction of surfaces in HyperView ? Or a solution (like a local system for each node) before the computation with optistruct to display values along normal direction in HV ? BR, Karl
×