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High‐performance vibration isolation technique using passive negative stiffness and semiactive damping
Author(s) -
Shi Xiang,
Zhao Fulei,
Yan Zhidan,
Zhu Songye,
Li JinYang
Publication year - 2021
Publication title -
computer‐aided civil and infrastructure engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.773
H-Index - 82
eISSN - 1467-8667
pISSN - 1093-9687
DOI - 10.1111/mice.12681
Subject(s) - vibration isolation , isolation (microbiology) , benchmark (surveying) , engineering , control theory (sociology) , power (physics) , vibration , stiffness , energy (signal processing) , vibration control , structural engineering , computer science , control (management) , acoustics , physics , geodesy , quantum mechanics , artificial intelligence , microbiology and biotechnology , biology , geography
Among active, semiactive, and passive vibration isolation methods, active control can provide the best isolation performances. However, high‐energy consumption hinders its wide applications in civil engineering field. This paper proposes a novel vibration isolation technique based on a passive negative stiffness spring (NSS) and a semiactive device (SAD), aiming to achieve an active isolation performance by using a low‐power semiactive technique. Due to its nature of negative potential energy, an NSS enables the semiactive isolation system to provide negative transient power flow that injects power into the structure and avoids the clipping phenomenon of semiactive control forces. Consequently, the combined NSS and SAD isolation system can perfectly generate the theoretical control forces calculated by an active control algorithm and achieve a considerably improved semiactive isolation performance. The prospects and performance advantages of the proposed NSS and SAD isolation system are validated through a series of numerical simulations of single‐degree‐of‐freedom and multi‐degree‐of‐freedom structures excited by various types of ground motions and a benchmark building model excited by seismic ground motions.