Random Vibration Analysis | Automotive Chassis | Basics of Ansys (ME) Tutorial 26

Random vibration analysis enables you to determine the response of structures to vibration loads that are random in nature. An example would be the response of a sensitive electronic component mounted in a car subjected to the vibration from the engine, pavement roughness, and acoustic pressure. .
Random vibration analysis can be used to calculate structure’s response to non-deterministic (random) loads such as turbulences or engine noise. Results are presented as statistical values because we don’t know the exact load history. Anyway, the following steps must be followed to perform random vibration analysis in ANSYS (and most of other FEA programs):
provide the excitation as PSD (Power Spectral Density) curve. It can be generated for time-dependent random signal or taken from design specifications. The unit of PSD is amplitude squared per unit frequency. Just remember that the original signal must have zero mean value as perturbation around base (zero) state is assumed in such analysis.
perform eigenfrequency simulation to find mode shapes needed for random vibration analysis (since it uses modal superposition technique)
apply base motion (motion in specified direction of the model’s fixed support) with PSD curved assigned; it can be applied in form of acceleration, velocity or displacement
in ANSYS multiple excitations can be applied at the same time but they can’t be correlated
after the analysis take a look at results - these will be in form of RMS values of field variables (RMS stress, RMS displacement and so on)

Links of all videos :-
1. Basics of Ansysworkbench
   • Ansys Tutorial | Basics of Ansys work...  
2. Extrude, Revolve, Sweeploft Method
   • Extrude, Revolve , Sweep , Loft | Bas...  
3. 1D Beam Analysis
   • 1D Beam Analysis Using ConceptTool Me...  
4. Tensile, Compressive, Bending Stress Analysis
   • Tensile, Compressive, Bending Stress ...  
5. Fixed -Fixed 1D Beam Analysis
   • Fixed -Fixed 1D Beam Analysis | Basic...  
6. 1D Meshing
   • Meshing | Basics of ansys (ME) 06  
7. Mesh Sizing
   • Mesh Sizing | Basics of ansys (ME) 07  
8. Simply Support Beam Analysis
   • Simple Support Beam | Basics of ansys...  
9. Truss Analysis
   • Truss Analysis | Basics of Ansys (ME)...  
10. 2D Model Analysis
   • 2D Model Analysis| Some design modell...  
11. 2D Meshing
   • 2D Meshing | Free Face Mesh | Basics ...  
12. How to improve quality of mesh
   • How to improve Quality of Mesh| Creat...  
13. How to generate high quality mesh
   • How to Generate quality Highmesh | Ba...  
14. 3D Meshing Theory
   • 3D Meshing Theory | Basics of Ansys (...  
15. Patch Conforming and Patch Independent Meshing Process
   • Patch Conforming & Patch Independent ...  
16. Cut Section of 3D Mesh Model
   • Cut Section View Of 3D Mesh Model | P...  
17. Sweep Method of 3D Meshing
   • Sweep Method of 3D Meshing | Basics o...  
18. Hex Meshing of 3D Meshing
   • Hex Meshing | 3D- Meshing | Basics of...  
19. Multizone Meshing of 3D Meshing
   • Multizone Meshing | 3D Meshing | Basi...  
20. Static Structural Analysis
   • Static Structural Analysis | Basics o...  
21. Transient Structural Analysis
   • Transient Structural Analysis | Basic...  
22. Mode Superposition Method
   • Mode Superposition Method | Transient...  
23. Inertia Relief Analysis
   • Inertia Relief Analysis | 3D Suspensi...  
24. Modal Analysis of 1D Supra Model Structure
   • Modal Analysis | 1D Supra Model Struc...  
25. Harmonic Analysis of A Fork
   • Harmonic Response Analysis of A Fork ...  
26. Random Vibration Analysis
   • Random Vibration Analysis | Automotiv...  
27. Response Spectrum Analysis of 3D Hinge
   • Response Spectrum Analysis | 3D Hinge...  
28. Steady State Thermal Analysis of Heatsink
   • Steady State Thermal Analysis | Heats...  
29. Transient Thermal Analysis of Heatsink
   • Transient Thermal Analysis | Heatsink...  

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