Vibration Analysis in Mechanica

[simvt1]

Hello,


I am trying to figure out how to model an assembly. I have a bracket that is attached by wire ring vibration isolators to a gas motor. I am trying to model how much vibration that brackets sees from the motor though a set of frequencies. I am trying to figure out what type of isolators to choose so I would like to vary that in this model. Would Mechanica be good for this and is so how would I go about modeling this correctly. Or if mechanism is best how would I go about modeling this in that software package?





Thanks

 

[ghgarzon]

Of course you can use Pro-Mechanica.


1. Model the bracket as connected by springs to ground. Mechanica has a built in spring icon that when invoked allows you to define points of attachment and values of stiffnesses.


2- Run a modal analysis


3-Define a measure or measures at points where you want to know the behavior of the bracket.


4. Define a Dynamic Time Analysis for ground excitation. You'll have to input the known disturbance coming from the engine in the time domain. This you can input as a function or via a table of acceleration or displacement vs. time


5. Run the analysis.


Alternatively, you may run a Dynamic Frequency Analysis for ground excitation; instead of entering information in the time domain, you'll input information of excitation in the frequency domain. In this case, you need to know the amplitude vs. coming from the engine, that in your analysis is 'ground', (I assume you're not interested in modeling the engine itsef).


This is a generic procedure, of course the details will take a few more pages.