In congested cities the number of railway lines has rapidly increased. The close vicinity of rail tracks to buildings often gives rise to conflict in respect of the transmission of noise and vibration to people or sensitive equipment. Vibration attenuation can be safely achieved by well designed vibration control systems applied preferably to the source but also to the receiver. In both cases, ...

Metastructures are typically composed of periodic unit cells designed to present enhanced dynamic properties in which either single or multiple resonators periodically distributed. Even though the metamaterials can obtain bandgaps with outstanding vibration attenuation, widths still be narrow for some practical applications. Rainbow have been proposed based on gradient random profiles provide f...

Adaptive-passive vibration and acoustic control systems can provide significant attenuation without requiring significant power compared to an active control system. The control system includes an algorithm to evaluate a costfunction to be minimised, which is typically a time-averaged multiplication of the vibration or noise on the resonator and at a point in the system where the disturbance is...

In this paper, a fractional-order extension of negative position feedback (NPF) controller for active damping is proposed. The design the motivated by frequency-domain loop shaping analysis, and dynamics are defined to maintain high-pass characteristics an integer-order NPF. proposed provides greater attenuation resonance peak flexible plant than integer order equivalent with same high-frequenc...

Hepatic steatosis assessment is of paramount importance for living liver donor selection because significant hepatic steatosis can affect the postoperative outcome of recipients and the safety of the donor. The validity of various noninvasive imaging methods to assess hepatic steatosis remains controversial. The purpose of our study is to investigate the association between noninvasive imaging ...

Abstract Metamaterials have been proven to hold potential enhance the Noise, Vibration and Harshness (NVH) performance in several applications, as they can create stop bands, which lead frequency zones of pronounced noise and/or vibration attenuation. This paper investigates influence footprint between resonant inclusions host structure on band behavior metamaterials. The impact this design fea...