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NX nastran SEMODES 103 – Response Simlation. Rene Herrmann Spectral analysis. Starting. Create your 3D model and Start Advanced Simulation SEMODES 103 – Response Simulation. Eigenfrequencies.

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Presentation Transcript
starting
Starting
  • Createyour 3D model and Start Advanced Simulation SEMODES 103 – Response Simulation
eigenfrequencies
Eigenfrequencies
  • Define 3D mesh and create material properties, density, E modulus and poisonratio. (fem file)
  • Createconstraints - in my case 2 edgesarelocked (sim file)
  • Solve (Solution X) right mouseselection SOLVE and find EIGENFREQUENCIES first.
new solution process
NEW SOLUTION PROCESS
  • Select from sim file NEW SOLUTION PROCESS -> Response Simulation, obtain NEW RESPONSE SIMULATION WINDOW and press OK, afterthatyouhave in SIMULATION NAVIGATOR
normal modes
Normal Modes
  • Select under NORMAL MODES [X] -> EDIT DAMPING FACTOR
event
EVENT
  • Select under RESPONSE SIMULATION X (rigthmouse) -> NEW EVENT (OK)
excitations 1
Excitations 1
  • Select under EVENT_X, Excitations -> New Excitation -> TranslationalNodal
excitations 2
Excitations 2
  • Youwillnowselect a point (node) tostudy
  • Onceyouselected a nodeyoufind (SelectNode(1)
excitations 3
Excitations 3
  • Youselect on the right of a coordinate (z) and find a f(x) FUNCTION MANAGER
function manager
FUNCTION MANAGER
  • Youselect the ICON under bottom (NEW) and obtain a XY FUNCTION EDITOR
  • Select under CREATION STEPS [XY]
  • Select under XY DATA CREATE the lefticon KEY IN FROM TEXT EDITOR (fill in as bellow and press OK ONCE) - frequency is 0 to 2000 Hz and 10 N load
excitation ready
Excitation - ready
  • Whenyou come to NEW TRANSLATIONAL NODAL EXCITATION Window UNCHECK x and y directions – PRESS OK
solve
SOLVE
  • SELECT in SIMULATION NAVIGATOR under EVENT_X, right mouse, EVALUATE FUNCTION RESPONSE, MODAL and get RESPONSE FUNCTIONS
solve what we got
SOLVE – whatwe got
  • The Eigenfrequencieswecalculatedfirstarenowdampedwith 2% viscosdamping, the spectrumwesee is how a vibration at thatresonancemovestootherfrequencies and decreases in amplitude
solve more nodal response
SOLVE MORE – NODAL RESPONSE
  • First go back to fem file – toseeyoumodelagain.
  • SELECT under EVENT_X, EVALUATION FUNCTION RESPONSE and chose there EVALUATE NODAL FUNCTION RESPONSE.
  • OBSERVE : RESPONSE REQUEST , DATA COMPONENT [Z] and get
nodal response what we learn
NODAL RESPONSE – whatwelearn
  • From the nodalresponseweseehow ONE concrete NODE (point) on the modelbehaves.
  • Younaturallychoose a point (node) whereyouexpecteitherlargestresses(clappning positions) or largedeflections (long freestandingstructures)
  • Yousee the amplitudeofdeflection (vibrationalamplitude) a a given point and frequency