《nCode-Intro_13.0_L08_Random_Vibration》.pdf

Customer Training Material LLectture 88 Random Vibration Fatigue IntroductionIntroduction toto ANSYSANSYS nCode DesignLife ANSYS, Inc. Proprietary Release 13.0 © 2011 ANSYS, Inc. All rights reserved. L8-1 August 2011 Introduction to ANSYS nCode DesignLife Random Vibration Background Customer Training Material • Fatigue damage is typically assessed for time based loading • RandomRandom loadingloading cannotcannot bebe effectivelyeffectively evaluatedevaluated inin thethe timetime domaindomain – can be evaluated in the frequency domain – statistical approach is required • Vibration fatigue determines the damage caused by random loading ANSYS, Inc. Proprietary Release 13.0 © 2011 ANSYS, Inc. All rights reserved. L8-2 August 2011 Introduction to ANSYS nCode DesignLife Random Vibration Background Customer Training Material • Harmonic vibration is caused by sinusoidal loading at one frequency • Random vibration is simultaneous loadings at different amplitudes, ffrequenciies, andd phhase anglles ANSYS, Inc. Proprietary Release 13.0 © 2011 ANSYS, Inc. All rights reserved. L8-3 August 2011 Introduction to ANSYS nCode DesignLife Random Vibration Fatigue Customer T