N2 - The nonlinear mathematical model of behavior of controllable viscosity fluid (CVF) under applied external field is presented. A large family of these fluids is commonly used to control responding forces of dampers in vibration control applications. The responding force of a damper with CVF has two components. The first one - uncontrollable - is proportional to the viscosity of a base fluid and velocity of its motion, the second one, which is controllable, depends on the strength of the applied external field. Both are involved in the process of dissipation of unwanted energy from the vibrating systems. An equivalent damping factor based on the principle of energy dissipated during one cycle of damper work under a constant strength external field was calculated. When mass or stiffness is variable the equivalent damping factor can be set accordingly by adjusting the strength of external field to have vibrating damped system purposely/continuously working in the critical or other chosen state. This paper also presents cases of applying periodically changing strengths of an external field synchronized with cycles of periodical motion of the vibrating system to continuously control the damping force within each cycle.
L1 - http://sp.czasopisma.pan.pl/Content/101521/PDF/10-paper.pdf
L2 - http://sp.czasopisma.pan.pl/Content/101521
PY - 2013
IS - No 2
EP - 222
DO - 10.2478/aoa-2013-0026
KW - noise control
KW - vibration control
KW - smart materials
KW - rheological fluids
A1 - Szary, Marek L.
A1 - Weber, Peter
PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics
VL - vol. 38
DA - 2013
T1 - The Study of Behavior of Vibrating Systems Controllable by Devices with Rheological Fluid
SP - 217
UR - http://sp.czasopisma.pan.pl/dlibra/publication/edition/101521
T2 - Archives of Acoustics