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NX nastran SEMODES 103 – Response Simlation

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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NX nastran SEMODES 103 – Response Simlation

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  1. NX nastran SEMODES 103 – ResponseSimlation Rene Herrmann Spectralanalysis

  2. Starting • Createyour 3D model and Start Advanced Simulation SEMODES 103 – Response Simulation

  3. 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.

  4. NEW SOLUTION PROCESS • Select from sim file NEW SOLUTION PROCESS -> Response Simulation, obtain NEW RESPONSE SIMULATION WINDOW and press OK, afterthatyouhave in SIMULATION NAVIGATOR

  5. Normal Modes • Select under NORMAL MODES [X] -> EDIT DAMPING FACTOR

  6. EVENT • Select under RESPONSE SIMULATION X (rigthmouse) -> NEW EVENT (OK)

  7. Excitations 1 • Select under EVENT_X, Excitations -> New Excitation -> TranslationalNodal

  8. Excitations 2 • Youwillnowselect a point (node) tostudy • Onceyouselected a nodeyoufind (SelectNode(1)

  9. Excitations 3 • Youselect on the right of a coordinate (z) and find a f(x) FUNCTION MANAGER

  10. 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

  11. Excitation - ready • Whenyou come to NEW TRANSLATIONAL NODAL EXCITATION Window UNCHECK x and y directions – PRESS OK

  12. SOLVE • SELECT in SIMULATION NAVIGATOR under EVENT_X, right mouse, EVALUATE FUNCTION RESPONSE, MODAL and get RESPONSE FUNCTIONS

  13. SOLVE – whatwe got • The Eigenfrequencieswecalculatedfirstarenowdampedwith 2% viscosdamping, the spectrumwesee is how a vibration at thatresonancemovestootherfrequencies and decreases in amplitude

  14. 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

  15. 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

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