The nonlinear behavior of soils can significantly modify the wavelet radiated from vibrator trucks. In this paper, we describe a field experiment designed to measure the nonlinear response of a natural soil formation in the near-field of a vibrator truck. A 267-kN (30-ton) vibrator truck performed a step-sweep through a set of 201 discrete frequencies from 50-Hz to 10-Hz, which was repeated at ...

Ventilation tunnel wind-induced vibration piezoelectric energy collection MFC as in the ventilation and stores it storage device to provide electrical required by wireless sensor tunnel. According effect of materials, instantaneous accumulated positive negative charges generated at both ends vibrator wind speed are collected. By establishing a model, irregular transient captured stored Availabl...

A unimorph piezoelectric cantilever equipped with an Acoustic Black Hole (ABH) termination is designed for broadband energy harvesting. The ABH termination, its tapered region, induces a focusing of the flexural vibrations which can be used to increase efficiency harvesting device. modal-based analytical model presented, providing explicit form electro-mechanical coupling each beam eigenmode. C...

An alternative representation of a Green’s function for electric fields on surfaces of thin impedance vibrators is proposed. The representation can be applied in software packages for simulation of RF and microwave devices. Advantages of the approach were demonstrated by analyzing the wellknown problem of a thin symmetrical horizontal vibrator above a perfectly conducting plane. For a half-wave...

Simultaneous vibration welding of 304 stainless steel was carried out with an eccentric circulating vibrator and a magnetic telescopic vibrator at subresonant (362 Hz and 59.3 Hz) and resonant (376 Hz and 60.9 Hz) frequencies. The experimental results indicate that the temperature gradient can be increased, accelerating nucleation and causing grain refinement during this process. During simulta...

Abstract Lead-free epitaxial (K 0.47 Na 0.53 )NbO 3 (KNN) thin films were fabricated on (001)SrRuO /Pt/ZrO 2 /Si substrates by RF magnetron sputtering at 650 °C and post-annealed the same a rapid thermal annealing (RTA) process. The crystal structure of KNN changed RTA, i.e. lattice parameter c in out-of-plane direction decreased instead an increase in-plane direction. displacement–electric fie...