This is a Phenomological Bouc Wen model for 200 KN large-scale magneto-rheological fluid damper (a model of the PWM Servo-Amplifier used to drive the damper is also included) developed at the Purdue University.
The physical counterpart of this model is the 200 kN large-scale MR dampers that are manufactured by the Lord Corporation. The damper is 1.47 m (58 inches) in length, weighs approximately 2.734 kN (615 lbs), and has an available stroke of 584 mm (23 inches). The damper&#39;s accumulator can accommodate a temperature change in the fluid of 80oF (27oC). The damper can provide control forces of over 200 kN (45 kip). The MR damper is controlled with a low voltage, current driven command signal. The coil resistance is approximately 4.8 ohms, with an associated inductance measured to be approximately 5 henrys (H) at 1 ampere (A) and 3 H at 2 A.
An Advanced Motion Controls PWM Servo-Amplifier (30A8) powered by an 80 volts (V) DC, 5 A unregulated linear power supply is used to provide the command signal that controls the electromagnetic field for each damper. The PWM Servo-Amplifier is controlled by a 0 - 5 V DC signal and utilizes pulse-width modulation for current control. The input control signal can be switched at a rate up to 1 kHz, although the rise time of the current signal is limited by the inductance of the MR damper. Each damper has been fitted with a 1.5KE75A transient voltage suppressor to protect the MR damper electromagnetic coils from unintended and damaging voltage peaks, limiting the peak voltage to 75 V. A PWM amplifier model which is described as a second order transfer function with a constant delay is also included.
This model is representative of the MR dampers owned by Prof. Richard Christenson at the University of Connecticut. &nbsp;Currently (2012), these dampers are hosted at two real-time hybrid simulation test facilities: the Smart Structures Technology Laboratory at the University of Illinois at Urbana Champaign and the RTMD Facility at NEES@Lehigh Lab facility. &nbsp;This model may need to be slightly adjusted for a specific damper, as it has been noted that there may be variance in performance for dampers of the same model.
Researchers should cite this work as follows:
Anthony Friedman; Zhaoshuo Jiang (2012), "Phenomenological Bouc-Wen Model for 200 kN Large-Scale Magneto-Rheological Fluid (MR) Damper," http://nees.org/resources/4122.