Impact Damper With Granular Materials for Multibody System

Abstract

An efficient impact damper consists of a bed of granular materials moving in a container mounted on a multibody vibrating system. This paper deals with the damping characteristics of a multidegree-of-freedom (MDOF) system that is provided with the impact damper when the damper may be applied to any point of the system. In the theoretical analysis, the particle bed is assumed to be a mass which moves unidirectionally in a container, and collides plastically with its end. Equations of motion are developed for an equivalent single-degree-of-freedom (SDOF) system and attached damper mass with use made of the normal mode approach. The modal mass is estimated such that it represents the equivalent mass on the point of maximum displacement in each of the vibrating modes. The mass ratio is modified with the modal vector to include the effect of impact interactions. Results of the analysis are applied to the special case of a three-degree-of-freedom (3DOF) system, and the effects of the damper parameteres including mode shapes and damper locations are determined. A digital model is also formulated to simulate the damped motion of the physical system.

The damping capacity improvement of machine tool structures by balls packing

“…This type of damper is simple in structure and has wide flexibility in machine structure applications. The impact damper packed with granular materials has been reported by Yokomichi et al [1] There are also many other interesting studies on impact dampers [2][3][4][5][6]. However, the damping capacity of such structures packed with granular materials or balls is induced from various energy consumption mechanisms creating many parameters that affect the damping characteristics.…”

Optimizing lightweight structures with particle damping using frequency based substructuring

“…metal and sand), the damping performance is independent of environmental conditions such as temperature or moisture. In comparison to viscoelastic dampers, this can be an advantage in many applications (Yokomichi et al 1996;Michon et al 2013).…”

“…Many studies focus on analytical models to predict the damping behaviour, such as equivalent models with a single degree of freedom (S-DoF). Such approaches have continuously been investigated to the present day (Yokomichi et al 1996;Friend & Kinra 2000;Michon et al 2013). For simplified parametric models, the problem so far is the high number of design parameters for particle damping compared to the number of variables existing for this type of modelling approach (Wong et al 2009).…”

Effect of Seawater Exposure on Impact Damping Behavior of Viscoelastic Material of Pounding Tuned Mass Damper (PTMD)

“…One group of solutions involve replacing the single mass with a number of smaller masses [30]. This idea has evolved to be used in new types of dampers, such as multi-unit damper [56,57], particle damper [58,59] and multi-unit particle dampers [60]. These dampers have been used in applications in many fields.…”