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Quasi-static cyclic behavior of wire rope isolators: comprehensive experimental study and improved mathematical
Moussa Leblouba1, P S Balaji2, E R Muhammad3
1Department of Civil & Environmental Engineering, University of Sharjah, P.O.BOX 27272, University City, Sharjah, United Arab Emirates.
Heliyon
|October 17, 2022
Summary
Wire rope isolators (WRIs) offer excellent shock and vibration isolation. This study reveals wire rope diameter is key to stiffness, while height-to-width ratio affects damping, with asymmetric behavior noted in vertical loading.
Area of Science:
- Mechanical Engineering
- Vibration Analysis
- Materials Science
Background:
- Wire rope isolators (WRIs) are critical components for shock and vibration mitigation in demanding sectors like military and aerospace.
- Understanding the complex hysteretic behavior of WRIs under various loading conditions is essential for optimizing their performance.
Purpose of the Study:
- To experimentally and mathematically investigate the cyclic hysteretic behavior of WRIs across all loading directions.
- To evaluate the effective stiffness and damping characteristics of WRIs in vertical (tension/compression) and lateral (shear/roll) directions.
- To develop a modified Bouc-Wen model capable of simulating asymmetric hysteretic loops observed in vertical loading.
Main Methods:
- Conducted extensive laboratory tests on WRIs with varying load-displacement amplitudes, rates, geometries, and sizes.
- Performed mathematical modeling to analyze stiffness and damping properties.
- Utilized the Bouc-Wen model for lateral directions and developed a modified version for vertical directions.
Main Results:
- Wire rope diameter was identified as the most significant factor influencing WRI stiffness.
- Damping characteristics were found to correlate with the height-to-width ratio for a specific wire rope diameter.
- Asymmetric load-displacement hysteresis loops were observed in the vertical direction, contrasting with the lateral directions.
Conclusions:
- The study provides critical insights into the factors governing WRI stiffness and damping.
- A modified Bouc-Wen model effectively captures the asymmetric hysteretic behavior in the vertical loading direction.
- Findings contribute to improved design and application of WRIs for enhanced shock and vibration isolation.
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