DEVELOPMENT OF FRICTION DAMPER WITH DISPLACEMENT DEPENDENT VARIABLE DAMPING FORCE CHARACTERISTICS

High Capacity Variable Friction Damper based on Band Brake Technology

Implementation of high performance controllable damping devices can ameliorate cost-effectiveness of structural systems for mitigation of natural hazards. However, the applications of these damping systems are limited due to a lack of 1) mechanical robustness; 2) electrical reliability; and 3) large resisting force capability. To broaden the implementation of modern damping systems, a novel sem...

Development of a New Semi-active Friction Damper

Control Characteristics of Mega-sub Controlled Structure System with Friction Damper under Rare Earthquake

In this paper, the seismic responses control characteristics of Mega-structure, Mega-sub Controlled Structure System (MSCSS) without dampers and MSCSS inserted friction dampers are investigated respectively under rare earthquake by using the elastic-plastic time history analysis method. The distribution of plastic hinges and different control efficiency of these structures under rare earthquake...

Free Vibrations of a Cable with an Attached Mr Damper – Experimental Analysis of Amplitude Dependent Damping

This paper presents results of experiments carried out on free vibrations of a cable with an attached magnetorheological (MR) damper. The attention is focused on the analysis of amplitude dependent damping of a cable with an MR damper operating in passive and controlled modes. In the case of the passive system, damping characteristics are nonlinear and display relevant drawbacks of the system. ...

Comparison of Friction Characteristics on TN and VA Mode Alignment Films with Friction Force Microscopy

Using frictional force microscopy (FFM), the friction surface characteristics were compared between twisted nematic (TN) mode and vertical alignment (VA) mode alignment films (AFs). The friction asymmetry was detected depending on temperature conditions on TN mode AF, but not on VA mode AF. The difference between two modes was explained by leaning intermolecular repulsion caused by the pre-tilt...