WEB DESK: Researchers have introduced a novel mechanical device designed to protect buildings and bridges from earthquake-induced damage, functioning independently of electricity. This advancement presents a promising solution for disaster scenarios involving intense shaking and power outages.
Developed by civil engineering professor Moussa Leblouba at the University of Sharjah, the patented system employs a hollow steel cylinder filled with solid steel balls. It works by absorbing and dissipating vibrational energy through friction, potentially safeguarding structures and delicate equipment during seismic events, strong winds, and other sources of high vibration.
According to a United States patent, the device’s energy dissipation relies on friction generated between the steel balls and connecting rods. Initial laboratory experiments have shown an effective damping ratio of approximately 14 percent.
How the Steel-Ball System Functions
Unlike high-tech systems reliant on sensors, computers, or smart sensors, this device operates purely on mechanical principles. It functions similarly to a shock absorber, with a central shaft moving back and forth within a cylinder packed with steel spheres.
When an external force—like an earthquake, gust of wind, train movement, or industrial vibration—causes a structure to sway or shake, the shaft oscillates through the packed balls. Small rods attached to the shaft press against these balls, creating friction that transforms some of the vibrational energy into heat and internal movement within the device, thereby reducing the force transmitted to the structure.
The simplicity of this system is deliberate. The inventor emphasizes that it functions through “basic physics,” relying solely on movement and contact, without the need for electronic components, software, or external power.
Significance of Friction-Based Damping
In earthquake resilience, the primary objective is not just to prevent collapse but also to minimize swaying, twisting, and impact forces that can crack structural elements, damage utility lines, or displace sensitive equipment.
This process, known as “energy dissipation,” involves absorbing and redirecting vibrational energy before it causes structural harm. The concept is comparable to how shock absorbers in vehicles mitigate the impact of bumps and uneven roads.
Previous research by the National Institute of Standards and Technology (NIST) has recognized passive dampers as effective tools for absorbing seismic energy and alleviating stress on structural components.
In major disasters, failures often cascade—leading to power outages, communication breakdowns, and blocked transportation routes. Systems that depend on continuous electrical power may become ineffective or non-operational during such crises.
This new device’s passive design means it requires no electrical power to operate. Its components—cylinder, steel balls, shaft, and rods—are separable, enhancing ease of installation and maintenance.
Its power-independent operation makes it especially suitable for critical infrastructure like bridges, hospitals, laboratories, and communication hubs, where maintaining stability and functionality during emergencies is vital.
