Abstract Metamaterials have been extensively studied because of their bandgap characteristics, which can be used in vibration isolation. Current studies on the effect attenuation metamaterials mainly focus amplitude, velocity, and acceleration. The structure intensity is a more effective approach to evaluating vibration. In this study, structural method adopted describe suppression elastic meta...

This paper presents a methodology for feedback adaptive control of active vibration attenuation systems in the presence of unknown narrow band disturbances. The proposed methodology consists in two algorithms based on the Internal Model Principle. The first one deals with an indirect adaptive control, the second one with a direct adaptive control. The feasibility of the two algorithms is illust...

Bolted connections are widely used in the machine tool manufacturing and equipment. As it is well known, bolt preload will be attenuated by vibration of tools, which degenerate working life tools. In this paper, a new experimental design method introduced into study on attenuation: quadratic general rotary unitized design. The dynamic analysis bolted connection carried out based finely fragment...

A power transmission system driven by a Cardan shaft may experience severe vibration due to fluctuating rotational speed and moments transferred the final drives, determined level of angular misalignment phasing joint yokes. This study investigates potential an out-of-phase position displaced phase angle in attenuating vibrations. The governing equations representing dynamics are derived. torsi...

It has been suggested that a suppression of maximal voluntary contraction (MVC) induced by prolonged vibration is due to an attenuation of Ia afferent activity. The purpose of the present study was to test the hypothesis that aftereffects following prolonged vibration on muscle activity during MVC differ among plantar flexor synergists owing to a supposed difference in muscle fiber composition....

With louder and louder weapon systems being developed and military personnel being exposed to steady noise levels approaching and sometimes exceeding 150 dB, a growing interest in greater amounts of hearing protection is evident. When the need for communications is included in the equation, the situation is even more extreme. New initiatives are underway to design improved hearing protection, i...