Abstract
Smoothness and discontinuous (SD) oscillator is a nonlinear oscillator with the variable frequency, whose frequency can be varied with the smoothing parameter. However, how to adjust the smoothing parameter has not been solved in the actual device. In this paper, the shape memory alloy (SMA) is introduced into the SD oscillator to form the SMA-SD oscillator to adjust the smoothing parameters. Combining the SMA-SD oscillator with MRF, a nonlinear dynamic vibration absorber (DVA) with variable frequency and damping is designed. The structure and control principle of the designed DVA is studied to achieve the two variable characteristics simultaneously by adjusting the current intensity. Numerical results on a two-degree-of-freedom coupled system show that the proposed DVA can adapt to different working conditions only by adjusting the current intensity.
Highlights
Vibration widely exists in civil engineering and mechanical industry
shape memory alloy (SMA) was introduced into the Smooth and discontinuous (SD) oscillator to adjust the smooth parameter α
When the SMA springs transformed from martensite to austenite phase, the SMASD oscillator possessed the variable and controllable smoothness parameter α, which was related to the natural frequency
Summary
Vibration widely exists in civil engineering and mechanical industry. Requirements of dynamic vibration absorbers (DVAs) are different for variable environments. erefore, it is an urgent problem to construct a DVA with the variable frequency which can meet the changeable working conditions. The applications of SD oscillator for the vibration reduction have been studied [2, 3], which showed that the desired effect of the vibration reduction can be achieved by adjusting the smooth parameter α In these papers, how to change α to realize the frequency conversion is barely mentioned. Erefore, the length of SMA springs can be controlled by using the thermal effect of the current, which will change the geometric nonlinear structure of the SD oscillator to achieve the variable frequency. Combining the SMA-SD oscillator and magnetorheological fluid (MRF), a nonlinear dynamic vibration absorber (DVA) with variable frequency and damping will be constructed, whose frequency and damping can be controlled simultaneously by adjusting the current intensity.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
