A light and fully flexible artificial muscle fabricated by 3D printing is able to instantly promote its stiffness an induced fringe electric field with different voltages, which then implemented as a semi-active absorber for vibration attenuation.

This paper presents a new method for a composite dictionary matching pursuit algorithm, which is applied to vibration sensor signal feature extraction and fault diagnosis of a gearbox. Three advantages are highlighted in the new method. First, the composite dictionary in the algorithm has been changed from multi-atom matching to single-atom matching. Compared to non-composite dictionary single-...

Abstract Hydraulic impact had an effect on pipeline vibration displacement, so it was important to study the external lateral periodic force fluid-structure coupling displacement of hydraulic pipeline. Based Bernoulli beam model, equation flexible established by analyzing stress under action internal flow. The system simulated whether subject force. displacement-time curves in x, y and z direct...

This paper addresses the development of a nonlinear control design for attenuating structural vibrations using magnetostrictive transducers operating in nonlinear and highly hysteretic operating regimes. We consider as a prototype a thin plate subjected to exogenous pressure waves and controlled via Terfenol-D transducers at the plate edges; however the methodology is sufficiently general to en...

Active control techniques aimed at reducing helicopter vibrations have been extensively studied in the last few decades. The most studied control law is the so-called T matrix algorithm; its implementation requires knowledge of the frequency response relating the control input to the output measurements at the disturbance frequency, which is very hard to characterise analytically. Adaptive sche...

According to experimental studies, low-amplitude high-frequency vibration is anabolic to bone tissue, whereas in clinical trials, the bone effects have varied. Given the potential of whole body vibration in bone training, this study aimed at exploring the transmission of vertical sinusoidal vibration to the human body over a wide range of applicable amplitudes (from 0.05 to 3 mm) and frequencie...

In built-up structures, one of the effective ways of dissipating unwanted vibration is to exploit the occurrence of slip at the interfaces of structural laminates. The present work focuses on the dynamic analysis of welded structures. A mathematical formulation has been developed for the mechanism of slip damping in layered and welded mild steel beams with unequal thickness subjected to both pe...

The United States Navy sponsored Truss Damping Program is a research study in the area of submarine noise reduction. The research explores the feasibility of effectively attenuating noise associated with vibration of rotating machinery by means of a truss support structure. Such a structure occupies the entire machinery space by supporting all internal equipment. This thesis explores the dynami...