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1:00 p.m.
2164 Glenn Martin Hall, DeWalt Conference Room
For More Information:
Heather Stewart
301 405 4195
ceegradstudies@umd.edu
Announcement: PhD Dissertation Defense
Name: Ashkan Keivan
Committee:
Dr. Brian Phillips, Chair
Dr. Balakumar Balachandran, Dean's Representative
Dr. Amde Amde
Dr. Mary Bowden
Dr. Chung Fu
Date/Time: Wednesday, May 9, 2018 at 1pm
Location: 2164 Glenn Martin Hall, DeWalt Conference Room
Title: RATE-INDEPENDENT LINEAR DAMPING IN VIBRATION CONTROL ENGINEERING
Abstract:
The focus of this dissertation is on incorporating rate-independent linear damping (RILD) in low-frequency dynamic systems such as base-isolated structures, inter-story isolated buildings, and vehicle suspension systems. RILD is a promising damping model for low-frequency structures because it provides direct control over displacement. Because the control force generated by RILD is proportional to displacement (advanced in phase by π/2 radians) and independent of frequency, it performs well under both low-frequency and high-frequency excitations (relative to the structure’s fundamental natural frequency). The π/2 radians phase advance makes RILD non-causal, which has hindered its practical applications. This dissertation proposes causal semi-active controllers and passive mechanical systems to approximate RILD in different areas of vibration control engineering. Numerical simulations, shake table tests, and real-time hybrid simulation (RTHS) tests are conducted to demonstrate the performance of the proposed causal approaches. The results compare well to non-causal simulations in both the achieved forces and system responses. RILD is demonstrated to be an attractive and practical damping alternative for vibration mitigation of low-frequency structures through the proposed algorithms and devices.
This Event is For: Public
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