Set11 - System Identification System Identification System...

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Unformatted text preview: System Identification System Identification System Identification System Identification • Black Box Identification – Input/Output Characteristics • Time (Step) Response Method irst Order System ME365 System Identification Slide 1 Galen King Purdue University – First Order System – Second Order System • Frequency Response Method – First Order System – Second Order System Black Box Identification Black Box Identification Black Box Identification Black Box Identification You were given a device to use in a temperature measurement task without y documentation and detailed information other than that it is a device for Linear System Input Output x(t) y(t) Thermal Couple, Strain Gauge, Other Instrument Components,... ME365 System Identification Slide 2 Galen King Purdue University 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? System Identification System Identification System Identification System Identification – Using Input/Output data to obtain information about the dynamic characteristics of a device or a system of devices. Linear System Input Output x(t) y(t) ME365 System Identification Slide 3 Galen King Purdue University – System identification involves selecting an appropriate governing diff. eq. and finding corresponding coefficients. – When the form of system model is known, system identification is analogous to dynamic calibration performed to obtain dynamic characteristics of a measurement device or a system of devices. – “Dynamic” Characteristics: • 1st Order Systems -- • 2nd Order Systems -- Time (Step) Response Time (Step) Response Time (Step) Response Time (Step) Response (1st Order System) (1st Order System) (1st Order System) (1st Order System) • 1st Order System (e.g. thermocouple) where τ is the time constant and K is the static sensitivity . ⇒ Step Response- The output of the system due to a step change in input....
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This note was uploaded on 12/26/2011 for the course ME 365 taught by Professor Merkle during the Fall '07 term at Purdue.

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Set11 - System Identification System Identification System...

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