An analysis is given for the mechanical characteristics of multilayer elastomeric isolation bearings where the reinforcing elements-normally steel plates-are replaced by a fiber reinforcement. The fiber-reinforced isolator, in contrast to the steel-reinforced isolator (which is assumed to be rigid both in extension and flexure), is assumed to be flexible in extension, but completely without fle...

Vibration isolation control is the critical issue to guarantee the performance of various vibration-sensitive instruments and sensors in practical engineering systems. In this paper, single network adaptive critic (SNAC) based controllers are developed for vibration isolation applications. The SNAC approach differs from the typical action-critic dual network structure in adaptive critic designs...

A new class of quasi-zero-stiffness (QZS) vibration isolation systems, inspired by the origami metamaterial, is proposed to achieve high-performance suppression in this paper. According mechanical characteristics Tachi–Miura (TMO) with single degree-of-freedom, nonlinear geometric relationship developed folding angle as master variable. By utilizing equivalent transformation and virtual work pr...

This study aims to design vibration isolators, using two types of coil springs with different hysteresis, and evaluate the isolation performance each design. Vibration is achieved through nonlinear spring characteristics isolators an origami-inspired foldable structure attached spring, which have quasi-zero stiffness. However, exhibited load-displacement curves between expansion contraction pro...

A seismic isolated structure is usually a long-period structural system, which may encounter a lowfrequency resonance problem when subjected to a near-fault earthquake that usually has a long-period pulse-like waveform. This long-period wave component may result in an enlargement of the base displacement and a decrease of the isolation efficiency. To overcome this problem, a rolling-based seism...

OBJECTIVES Prolonged exposure to severe chipping hammer vibration may cause hand-arm vibration syndrome. A reliable test method is required to select appropriate tools and assist in the development of better chipping hammers. In the present study, the ISO standardized test method (ISO 8662-2, 1992) was examined through an investigation of the vibration characteristics of chipping hammers operat...