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  1. FSB1

    creating random vibration test specifications

    I am creating random vibration test specifications for multiple units following this reference https://femci.gsfc.nasa.gov/random/randomtestspec.html is there a software that implements automatically these rules in guideline 3 of this reference? it becomes useful if you have to create multiple...
  2. FSB1

    2d detail drawing of composite

    I have a panel made of cfrp layers doing the 2d drawings of this panel, how/where to specify the material layers? in a table ?
  3. FSB1

    RBE interface force

    How to evaluate the forces at RBE2 and RBE3 interfaces? Is it possible to do it without a spring or beam element in between? What I have is CQUAD4 - RBE2 - CQUAD4 and CQUAD4 - RBE3
  4. FSB1

    solidworks very slow (not assembly!)

    My solidworks suddenly became very slow, even if I am starting a new part, or clicking anything, for example "Front Plane", it makes my power usage to instantly spike to "very high" (image attachment) I have restarted the computer, I have enough space in the disk, and I don't see what could be...
  5. FSB1

    High response misplaced

    Running a frequency response in a structure and plotting the accelerations at specific locations, from 10-100 Hz The resonance modes in these locations are in the range 60-80Hz, but the maximum plotting the maximum accelerations, these maximum appear at 25-35Hz, which is not expected. Anyone...
  6. FSB1

    Generating random envelope

    See attachment picture I want to place orange structure in the blue structure. 1) The orange structure was analyzed, isolated, with a specific random input. Accelerations on the structure were extracted. 2) The blue was analyzed, together with the orange, and with a similar random input of the...
  7. FSB1

    sandwich panel cost, space

    What is, in your region the typical price of a sandwich panel for space application, with dimensions 300mm x 300mm x 10mm?
  8. FSB1

    honeycomb panels box

    What is the typical procedure to ensure the following: assembly a box made of 6 honeycomb panels what would be the connecting element between the panels? how to make sure the core is not visible?
  9. FSB1

    Mg with Al -> Problem?

    I read magnesium is soluble in aluminum is it reasonable to have one part of aluminum in contact with one part made of magnesium? Would I have degradation of the magnesium part? corrosion? ...
  10. FSB1

    Gear match, position of the center

    At what distance should the center of the gear be to have a perfect match? -I am including the 2 gears in a CAD, but need to know which position I should place the center of the gearshttps://files.engineering.com/getfile.aspx?folder=7a74cbbe-caed-4129-ba7d-f9a8c6e1d760&file=Capture.JPG
  11. FSB1

    reduce vibration levels

    what are the typical techniques to reduce the levels of random vibration (g_rms) passed to a DUT-device under testing?
  12. FSB1

    bracket load and stiffness requirements (space)

    For a bracket being design for space applications where do the structural requirements come from, for example frequency higher 120Hz acceleration x,y,z 20g,20g,25g random and so on where the exact numbers come from? because the documents I searched are generic
  13. FSB1

    vibration testing

    What is the criteria to decide if it would be better to test (or not) an structural item for the following tests: [ol 1] Sine testing Random testing Shock testing [/ol] Typically for structures 2. Random is tested But sometimes people decide that it is safe to not test 1.Sine, and 3.Shock What...
  14. FSB1

    relative strength of materials

    What are the properties that define if an arrow can pierce through a wall? I guess the material properties, as ultimate strength and the geometry - thickness of the wall, sharpness of the arrow but given particular examples arrow of steel wall of titanium, 10mm thick, how can we theoretically...
  15. FSB1

    spider in holes

    Is there anyway to place a spider in every hole present in a model?
  16. FSB1

    2D laminate composite plane stress

    For plane elememts, I can choose Laminate, Plate, Plot only, Plane Strain... Any way to generate a property for 2D laminate elements in plane stress state?
  17. FSB1

    FEMAP - nodes move by deform - recover

    Hi all by using custom tools > post processing > nodes move by deform all nodes will have the coordinates of the deformed model. is there a way to have the nodes at the previous, non-deformed, coordinates? thanks
  18. FSB1

    linear extrapolation

    how to do a linear extrapolation of stresses from integration points to the nodes in wedge element (6 nodes)? What is the fuction (linear) to use for this extrapolation?
  19. FSB1

    FEMAP - convection

    I'm trying to solve a simple convection in FEMAP How can I choose the properties of the air in FEMAP, namely its temperature, h, and eventually speed? Am I supposed to defined some sort of infinite reference point with the air properties? I'm also attaching the model as it is now, for those...
  20. FSB1

    PCOMPS stacking direction

    Modelling solid composite panel with PCOMPS, CHEXA I'm having this error: THE STACKING DIRECTION FOR THE COMPOSITE PENTA ELEMENT ID xxxx IS ONLY SUPPORTED ALONG THE NORMAL DIRECTION OF THE TWO TRIANGULAR FACES.

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