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Re: Dynamic Analysis[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Dynamic Analysis
- From: BCainse(--nospam--at)aol.com
- Date: Wed, 22 Nov 2006 09:50:51 EST
Jake's advice of looking at the model carefully and verifying by equivalent static methods is a good one. An additional gut check can be done by creating a simple dynamic model you think captures the basic elements of the response (unfortunately, this takes experience developed by doing analyses and carefully understanding the results). If there are differences with your more complex model, UNDERSTAND WHY before proceeding.
I find young engineers are frequently given powerful tools in the form of modeling software, whether it be for structural analysis, hydraulic networks or whatever but are generally given much too little guidance on understanding the results and how to verify that their model represents the physical situation they are trying to model. They run A MODEL and assume the results are correct without truly understanding what the model is portraying. Remember that a model is simply a mathematical attempt to understand a physical reality. Assumptions are made to simplify the analysis and it is usually these assumptions that make the model be a representation of the physical situation OR NOT. Too often I see people trying to use results they don't understand based on assumptions whose effects they also don't understand.
Christopher Wright has lectured this list for years on getting help from some one experienced in modeling and analysis. That is probably the best advice that can be given.
Bill Cain, S.E.
In a message dated 11/22/2006 4:21:47 A.M. Pacific Standard Time, jake.watson1(--nospam--at)gmail.com writes:
I picked it up under the supervision of two other senior engineers. The basic concepts are relatively easy. CSIBerkely has a some great white papers on their website. If you have never done this before, I strongly suggest your read them. You can find them at http://www.csiberkeley.com/support_technical_papers.html.
Bill Cain, S.E.
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