NM10_parameterest - Curve Fitting and Parameter Estimation...

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2002 1 Curve Fitting and Parameter Estimation Finding Physical Parameters Working With Experimental Data Chapter 10
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2002 2 In the “real world” A big part of engineering is being able to measure physical phenomena. This could be: Temperature Pressure Acceleration Force Velocity etc.
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2002 3 Why To verify a computer model. Finite Element analysis must be verified with experimentation on “real” hardware. When conducting an experiment Troubleshooting Need to measure strain to determine why a part fails To determine properties that are not easily obtained mathematically or to verify properties that were generated mathematically
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2002 4 What Sometimes it is sufficient to have a single data point The temperature at a certain time was 85 o C. Sometimes it is necessary to measure a phenomena over time To generate a load versus strain, you must measure both for the time necessary to perform the test.
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2002 5 How? Normally, this process involves a transformation of the phenomena (temperature, pressure, etc.) to a voltage output that can be measured by a voltmeter, oscilloscope or digital acquisition system. To “get the data into a computer” an analog to digital converter (ADC) is used to “read the data” (converts the data to digital form)
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2002 6 Digital Data
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2002 7 Digital Data
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2002 8 Digital Data Computers can only work with numbers. The sine wave on the previous slide is represented
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NM10_parameterest - Curve Fitting and Parameter Estimation...

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