A Study of a Variable Friction Damper with a Stepped Force Characteristic

2009 ◽  
Author(s):  
B. Blostotsky ◽  
Y. Ribakov
Keyword(s):  
Force Characteristic ◽  
Friction Damper ◽  
Variable Friction

Passive Variable Friction Damper for Increased Structural Resilience to Multi-Hazard Excitations

2018 ◽  
Author(s):  
Austin Downey ◽  
MohammadKazem Sadoughi ◽  
Liang Cao ◽  
Simon Laflamme ◽  
Chao Hu
Keyword(s):  
Structural Control ◽  
Seismic Event ◽  
Active Damping ◽  
Friction Damper ◽  
Strength Based ◽  
Story Drift ◽  
Variable Friction ◽  
Wind Events ◽  
Better Than ◽  
Damping Systems

Structural control systems, including passive, semi-active and active damping systems, are used to increase structural resilience to multi-hazard excitations. While semi-active and active damping systems have been investigated for the mitigation of multi-hazard excitations, their requirement for real-time controllers and power availability limit their usefulness. This work proposes the use of a newly developed passive variable friction device for the mitigation of multi-hazard events. This passive variable friction device, when installed in a structure, is capable of mitigating different hazards from wind and ground motions. In wind events, the device ensures serviceability, while during earthquake events, the device reduces the building’s inter-story drift to maintain strength-based motion requirements. Results show that the passive variable friction device performs better than a traditional friction damper during a seismic event while not compromising any performance during wind events.

scholarly journals Numerical simulation of oscillations of a nonlinear mechanical system with a spring-loaded viscous friction damper

2019 ◽  
Vol 265 ◽  
pp. 05030
Author(s):  
Viktor Nekhaev ◽  
Viktor Nikolaev ◽  
Marina Safronova
Keyword(s):  
Differential Equations ◽  
Mechanical System ◽  
Degrees Of Freedom ◽  
External Disturbance ◽  
Viscous Friction ◽  
Force Characteristic ◽  
Friction Damper ◽  
System Of Differential Equations ◽  
Nonlinear Force ◽  
Linear Spring

The dynamics of a mechanical system consisting of a parallel-connected main elastic element, an external disturbance compensator having a nonlinear force characteristic, and a viscous friction damper sprung by a linear spring are studied. The resulting system of differential equations describing the behavior of the system has one and a half degrees of freedom and has specific properties depending on the ratio of stiffness of the main spring and the spring suspension of a viscous friction damper. It is established that a single nonlinear system with one and a half degrees of freedom has either one or two harmonics. In the general solution of the system of differential equations, there are always two harmonics in the above-resonance zone, one of which is always equal to the disturbance frequency, and the second one is sufficiently close to the frequency k0. In the linear conservative case and the absence of suspension of the viscous friction damper, the natural frequency of the displacement of the system k0 =14.046 s-1.

scholarly journals A new lever-type variable friction damper for freight bogies used in heavy haul railway

2016 ◽  
Vol 24 (3) ◽  
pp. 159-165
Author(s):  
Ximing Xu ◽  
Maohai Fu ◽  
Zhaoxia Xu ◽  
Zhongyi Chen
Keyword(s):  
Friction Damper ◽  
Heavy Haul ◽  
Variable Friction ◽  
Type Variable ◽  
Heavy Haul Railway

716 Passive Vibration Ioslation System by Variable Friction Damper

2003 ◽  
Vol 2003 (0) ◽  
pp. _716-1_-_716-5_
Author(s):  
Yoshihito SATOH ◽  
Hideya YMAGUCHI
Keyword(s):  
Friction Damper ◽  
Variable Friction
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