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Unformatted text preview: ME365 System Identification 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 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 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. – 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 -- Linear System Input Output x(t) y(t) ME365 System Identification 4 Time (Step) Response (1st Order System) • 1st Order System (e.g. thermocouple) where τ is the time constant and K is the static sensitivity ....
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- Fall '07
- Decibel, Electronics terms