

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 caseA and in caseB the same cantilever subject to 5000 N tip load. Now you will get a feel that CaseB loaded heavier than CaseA. 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 < PSDA input curve> 2) Rough Off road
. For both the PSDA input curve and PSDB input curve, GrmsA and GrmsB 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 canâ€™t understand any thing, more details should be accompanied along with Grms.

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