lec06_sysid

lec06_sysid - ME365 System Identification Slide 1 System...

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Unformatted text preview: 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 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 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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lec06_sysid - ME365 System Identification Slide 1 System...

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