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Technical Note

Optimal positioning and distribution of magnetorheological damper

Chandan K1, Daniel C1,2, Anuroop P2, S. Vivekananda Sharma1,3, Arunraj E1, Hemalatha G1

1Department of Civil Engineering, Karunya Institute of Technology and Sciences, Coimbatore, India
2Department of Civil Engineering, Hindustan Institute of Technology and Science, Chennai, India
3Department of Civil Engineering, National Institute of Technology Meghalaya, Shillong, India

Keywords

Abstract


Magnetorheological (MR) damper; 

 MR damper placement; 

Semi-Active control; 

Equation of motion

During seismic events, devices are used to disperse energy in buildings, reducing structural damage and preventing collapse. One such device is the magnetically polarizable particle damper, consisting of a hydraulic cylinder filled with magnetically responsive particles in fluid. Recent research optimized damper placement and distribution using detailed mathematical modeling and mode shapes covering over 95% of the building's mass. Researchers identified critical damper positions by correlating these models with maximum force functions in the equations of motion. The study proposed a positioning strategy to reduce costs associated with damper installation in typical building practices. The number of dampers required varied with applied loads: 20kN, 30kN, 90kN, and up to 200kN. For instance, under 20kN and 30kN loads, optimal distribution included assigning 8 dampers to the ground, first, second floors, decreasing to 4 on floors three and four, and 2 on the fifth floor, totaling 14 and 20 dampers, respectively. Optimization values for these loads were calculated at 17.71. Dealing with a 90kN load required 44 dampers, distributed as 8 on lower levels, 4 on the third floor, and 8 each on floors four and five. Remarkably, while 20kN and 30kN damper counts reduced, 24 were added for 90kN, yielding an optimization score of 45.84. For a 200kN load, 17 dampers were strategically allocated, with specific placements adjusted per floor, achieving an efficiency score of 49.616. This underscores the effectiveness of the chosen damper arrangement in bolstering structural resilience against seismic forces.

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