The vibration serviceability of flooring structures has been of concern for decades. To date, design criteria classifying the dynamic behaviour of different types of timber flooring structures to an acceptable degree have not been well established. Parameters commonly used to investigate and assess vibrational performances of timber floors include natural frequencies, damping ratios, dynamic di...

Acoustic Black Holes (ABH), a new method of passive vibration damping, have received much interest recently due to their lightweight and economically efficient properties. This paper aims to establish the optimal shape of the damping layer treated on ABH under harmonic loading. Firstly, a validation of numerical scheme that is used throughout this paper is carried out. A good agreement of the n...

Cables, such as are used in cable-stayed bridges, suspension bridges, guy wires, transmission lines, and flexible space structures, are prone to vibration due to their low inherent damping characteristics. The mitigation of cable vibration is necessary to minimize negative impact. Transversely-attached passive viscous dampers have been implemented on some cables to dampen vibration. However, it...

A great difficulty is faced in the design of such structures due to the fact that the reduction in weight results in low rigidity and reduced vibration characteristics. Apart from the vibration is effectively controlled; it may destabilize the system and may, very often, result in complete failure of the system. Several advanced applications, such as those in jet fighters, automobiles and space...

This paper presents a new approach for the use of piezoelectric materials, PVDF and PZT, for vibration attenuation of a planar parallel manipulator. Since lightweight linkages of parallel manipulators deform under high acceleration/deceleration, such motion induced vibration would have to be damped quickly to reduce settling time of the platform position. An active damping controller is develop...

This paper explores the vibration damping properties of thermal barrier coatings (TBCs) containing thin plastically deformable metallic layers embedded in an elastic ceramic matrix. We develop an elastic–plastic dynamical model to study how work hardening, yield strain, and elastic modulus of the metal affect the macroscopic damping behavior of the coating. Finite element (FE) simulations valid...

As the 2nd report, we present a practical calculation method for torsional vibration of highly damped system with rubber couplings. This calculation system, constructed by a modal analysis technique, outputs frequency response characteristics, forced vibration responses, and mode animations. In respect of a damping model and calculation accuracy, it was verified that the assumption of general v...

The addition of sand to cement paste was found to degrade the vibration damping ability, as shown by decreases in both loss tangent and storage modulus under flexure. However, further addition of silica fume more than restored the vibration damping ability, due to the silica fume causing increases in both loss tangent and storage modulus. Silica fume increased the loss modulus of mortar by as m...

in this paper, a novel compensator based on magnetically controlled reactor with fixed capacitor banks (fc-mcr) is introduced and then power system stability in presence of this compensator is studied using an intelligent control method. the problem of robust fc-mcr-based damping controller design is formulated as a multi-objective optimization problem. the multi-objective problem is concocted ...