Purpose The existing Nonlinear Dynamic Vibration Absorbers (NLDVAs) have the disadvantages of complex structure, high cost, installation space requirements and difficulty in miniaturization. And most NLDVAs not been applied to reality. To address above issues, a novel Triple-magnet Magnetic Absorber (TMDVA) with tunable stiffness, only composed triple cylindrical permanent magnets an acrylic tu...

The pin-in-the-slot joint is a common element in machines, and the dynamics of joints with clearances an actively investigated topic. Important applications such can be found Geneva mechanisms, robotized gear selectors, centrifugal vibration absorbers (CPVA) other important mechanical devices. paper will review main analytical steps required to obtain equations characterizing different force co...

We have conducted a systematic survey for intervening OVI absorbers in available echelle spectra of 16 QSOs at zQSO = 0.17 − 0.57. These spectra were obtained using HST/STIS with the E140M grating. Our search uncovered a total of 27 foreground O VI absorbers with rest-frame absorption equivalent width Wr(1031) & 25 mÅ. Ten of these QSOs exhibit strong OVI absorbers in their vicinity. Our OVI su...

Mechanical vibration is mostly harmful, and it may not only generate noise but also affect the working life of equipment. Lever, inerter, grounded stiffness have good performance in field control, dynamic absorber simultaneously containing lever, rarely studied. Based on dampertype absorber, a with presented. And optimal system parameters are analytically researched detail. Firstly, differentia...

Ca ii λλ3934, 3969 absorbers, which are likely to be a subset of damped Lyman α systems, are the most dusty quasar absorbers known, with an order of magnitude more extinction in E(B−V) than other absorption systems. There is also evidence that Ca ii absorbers trace galaxies with more ongoing star-formation than the average quasar absorber. Despite this, relatively little is known in detail abou...

The special issue entitled “Mathematical modelling, nonlinear dynamics, bifurcation, synchronization and control of mechanisms driven by power supply,” published European Physical Journal: Special Topics (EPJST), aims to bring into discussion works involving dynamic chaotic behaviors, which are frequently found in mechanical electromechanical systems, circuits, biologically inspired stimulating...

The demand of ultra-precision micro-machine tools is growing day by due to exigent requirements miniaturized components. High accuracy, good dimensional precision and smooth surface finish are the major characteristics these machine tools. High-speed machining has been adopted increase productivity using high-speed spindles. However, tool vibration a issue in machining. Vibration significantly ...