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
2. Extrude, Revolve, Sweeploft Method
3. 1D Beam Analysis
4. Tensile, Compressive, Bending Stress Analysis
5. Fixed -Fixed 1D Beam Analysis
6. 1D Meshing
7. Mesh Sizing
8. Simply Support Beam Analysis
9. Truss Analysis
10. 2D Model Analysis
11. 2D Meshing
12. How to improve quality of mesh
13. How to generate high quality mesh
14. 3D Meshing Theory
15. Patch Conforming and Patch Independent Meshing Process
16. Cut Section of 3D Mesh Model
17. Sweep Method of 3D Meshing
18. Hex Meshing of 3D Meshing
19. Multizone Meshing of 3D Meshing
20. Static Structural Analysis
21. Transient Structural Analysis
22. Mode Superposition Method
23. Inertia Relief Analysis
24. Modal Analysis of 1D Supra Model Structure
25. Harmonic Analysis of A Fork
26. Random Vibration Analysis
27. Response Spectrum Analysis of 3D Hinge
28. Steady State Thermal Analysis of Heatsink
29. Transient Thermal Analysis of Heatsink

#automotivechassis #randomvibrationanalysis #ansystutorials

[naderwilliam]

What is the volume of this chassis please as an error poped out saying invalid volume

[wijdaneelfadi]

Hello sir! can use this method to illustrate the frequencies and vibrations in a truck chassis caused by engine vibration and irregular road surfaces???

[wijdaneelfadi]

Hi! how and where did you get the values of PSD G acceleration ???

[nardinenabil]

Hey Dr please can you send me the chassis model in this video

[abhishektiwari]

Sir, Can you Share this file on my mail.

[AnuragGupta-opuz]

Sir, i want to perform random vibration analysis of cantilever beam in a coding environment ( especially in python). Can you please tell me what is the theory behind random vibration i.e what are the formulas can be used? How psd of load can be inputted? In the theoretical portion, i have read about psd matrix of load n hermitian matrix, can u please suggest me from where i will start in python ?

[antonaveendp]

Sir is it possible to share this file too...to my email I'd sir

[omkarsutar]

I have some doubts in this problem so can please reply me on mail

[alekyayadav]

Sir is it possible to share this file too...to my email I'd sir