January 25, 2023 at 7:34 amFAQParticipant
Grms is a relative feel. For an example, if you have cantilever beam subjected to 1000 N tip load in case-A and in case-B the same cantilever subject to 5000 N tip load. Now you will get a feel that Case-B loaded heavier than Case-A. Grms is used to qualitatively access both the Input PSD and Response PSD (RPSD). For an example, you have bracket mounted on a chassis subjected to base excitation, which is specified in terms of PSD and your objective is to access a bracket design through PSD analysis. Let say, this bracket is to be accessed for two different road conditions 1) Smooth Highway road < PSD-A input curve> 2) Rough Off road
. For both the PSD-A input curve and PSD-B input curve, Grms-A and Grms-B can be calculated respectively, as explained here (https://www.vibrationresearch.com/public_pdf/RandomRMSCalculation.pdf). More the Grms heavier the loading, again; its a relative feel. Like for input PSD, from the RPSD also Grms can be calculated. For an example ; for ONE give input PSD profile, you want to ascertain 2 different bracket design. After doing PSD analysis for both the brackets you will give two different RPSDs one from each bracket. Now you can also calculate two different Grms (output / response). Among there Output Grms values, higher Grms bracket qualitatively tells that there is more dynamics magnification, compared to other bracket. Just with the Grms value, an engineer can’t understand any thing, more details should be accompanied along with Grms.
Introducing Ansys Electronics Desktop on Ansys Cloud
The Watch & Learn video article provides an overview of cloud computing from Electronics Desktop and details the product licenses and subscriptions to ANSYS Cloud Service that are...
How to Create a Reflector for a Center High-Mounted Stop Lamp (CHMSL)
This video article demonstrates how to create a reflector for a center high-mounted stop lamp. Optical Part design in Ansys SPEOS enables the design and validation of multiple...
Introducing the GEKO Turbulence Model in Ansys Fluent
The GEKO (GEneralized K-Omega) turbulence model offers a flexible, robust, general-purpose approach to RANS turbulence modeling. Introducing 2 videos: Part 1 provides background information on the model and a...
Postprocessing on Ansys EnSight
This video demonstrates exporting data from Fluent in EnSight Case Gold format, and it reviews the basic postprocessing capabilities of EnSight.
- Why is damped frequency is lower than undamped frequency with viscous damping but larger with structural damping?
- How can I specify acceleration at a node? Could I use the ‘big mass method’?
- How can I change the normalization method of the vibration modes from modal analysis?
- ANSYS Mechanical: Vibration Housing Noise
- Why does the prestress from Static analysis does not add up to the stress in Random Vibration analysis?
- In a Modal Analysis of Mechanical, why aren’t the Participation Factors Summary under Solution Information displayed?
- A Shock absorber is represented as spring element with damping constant. Modal analysis is performed using Reduced Damped (QRDAMP) solver. How to perform a Modal super position harmonic or transient analysis further ?
- Can you output the frequency response for a total deformation?
- Is it possible to perform a sine-on-random vibration analysis in either Mechanical or Mechanical APDL?
- In the results of a modal analysis, how can I define that a frequency is an output parameter ?
© 2023 Copyright ANSYS, Inc. All rights reserved.