Passive vibration control using a linear particle chain impact damper
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Passive control is preferred due to its simplicity and zero power consumption. A common passive control device is the impact damper which consists of a freely moving mass constrained by two stops inside a container mounted on the primary system. Typical application of impact dampers are vibration attenuation of cutting tools, television antennas, turbine blades, manufacturing machines, heavy armored personnel carriers (Armadillos), digger machines, structures, plates, tubing, and shafts. Researchers have attempted to develop the impact damper for many decades. The objectives have been to decrease the high accelerations, contact forces, and noise levels. The common types of impact damper are the following: single unit impact damper (1-dof or 2-dof), multi-unit impact damper, bean bag damper, particle (or granular) impact damper, resilient impact damper, and buffered impact damper. In this paper, a new type of impact damper consists of linear chain of spherical balls. Previous work proposed a new energy absorption scheme based on the multiple impact in the linear chain of spherical balls with different sizes. The new impact damper is based on placing a small ball between each two larger balls in the chain. Hence, the small ball will have numerous collisions with the larger balls during an impact event. This behavior leads to the dissipation of the kinetic energy due to the numerous collisions of the large balls. The linear chain impact damper is validated by comparing its responses with the single unit impact damper. A parametric study is conducted to specify the sufficient number of balls and the efficient diameters to be used in a specific available space in the primary system.
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Qatar Foundation Annual Research Forum Volume 2012 Issue 1
