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lec06_sysid

# lec06_sysid - System Identification Black Box...

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ME365 System Identification Slide 1 System Identification Black Box Identification Input/Output Characteristics Time (Step) Response Method First Order System Second Order System Frequency Response Method First Order System Second Order System

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ME365 System Identification Slide 2 Black Box Identification You were given a device to use in a temperature measurement task without any documentation and detailed information other than that it is a device for measuring temperature. How would you proceed? What is your next step? What information is essential in the successful operation of the measurement device? What are the experiments that will facilitate the gathering of the essential information? How do we derive the essential information from experiment data? Linear System Input Output x(t) y(t) Thermal Couple, Strain Gauge, Other Instrument Components,...
ME365 System Identification Slide 4 Time (Step) Response (1st Order System) 1st Order System (e.g. thermocouple) where t is the time constant and K is the static sensitivity . Step Response - The output of the system due to a step change in input. t dy dt y K x Given y ( t ) = y o at t = 0, Let x ( t ) = C for t 0 and x ( t ) = C o for t < 0 , then   y t y y y e y y y e f o f t o f o t t t 1 Time ( t ) x ( t ) 0 C C o Time ( t ) y ( t ) 0 y o y f

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ME365 System Identification Slide 3 System Identification Using Input/Output data to obtain information about the dynamic characteristics of a device or a system of devices. System identification involves selecting an appropriate governing diff. eq. and finding corresponding coefficients.
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