The fundamental principles governing the reduction of energy in an acoustic or vibration field have been understood for decades. In recent years, the concept of active control has been investigated as a means of controlling the acoustic or vibration field [1-3]. To implement active control, a number of "secondary" sources are introduced into the system which interact with the original "primary"...

Rainbow trapping is a phenomenon that enables vibration confinement due to the gradual variation of wave velocity in space, which typically achieved by means locally resonant unit cells. In context electromechanical metastructures for energy harvesting, this strategy employed improve mechanical-to-electrical conversion and thereby maximize harvested power. contrast structures endowed with eithe...

Large-scale modern wind turbines at standstill are prone to vortex-induced vibrations. In this study, we propose the use of aero-damping map investigate complex vibration responses turbine airfoil 90° attack angle with different levels structural dampings. The amplitude and response frequency in lock-in condition soft conditions agree well contour line on which sum aerodynamic damping is equal ...

Abstract Recently, vibration control has been useful in various engineering fields such as aerospace, adaptive dynamic absorbers, and infrastructure. Magnetorheological elastomer (MRE) is an interesting material for controlling suppressing undesirable vibrations through the application of a magnetic field. The present study aims at analyzing pre-structure magnetorheological viscoelastic core re...

This paper reports dynamical effects in one-dimensional locally resonant piezoelectric metastructures leveraged by nonlinear electrical attachments featuring either combined quadratic and quartic, or essentially quartic potentials. The electromechanical unit cell is built upon a linear host oscillator coupled to circuit via piezoelectricity. Semi-analytical harmonic balance (HB)-based dispersio...

We present a method to calculate the sensitivity of two least stable eigenvalues with respect an external forcing added in fluid-structure interaction system (FSIS). Sensitivity computations are performed by setting proportional flow velocity applied local point domain. find that fields FSIS can be very different from its fixed structure counterpart. For elastic vary according reduced velocity....

To reduce the vibration of a ship’s high-temperature pipeline, long coated damping structure (LCDS) with entangled metallic wire material (EMWM) is proposed in this paper. The structural analysis for pipelines carried out. theoretical indicates that increasing thickness layer particular range can improve attenuation effect an LCDS. Additionally, experimental verification confirms after system p...