The coupling between parametric and external resonances in inclined cables subjected to a motion of an anchorage with components both along and perpendicular to their axis is investigated. Besides posing theoretical challenges, this problem is of practical interest for inclined cables of cable-stayed bridges and guyed towers. First, the state of the art on the subject of multi-modal interaction...

The paper presents the research of flow instabilities in inlet part a centrifugal compressor channel equipped with radial guide vanes. A simplified model is created and for that, dimensional analysis carried out. Methods computational fluid dynamics (CFO) are employed parametric study, which gives basic information about influence dimensionless parameters to field. Reconstruction comprehensive ...

Frequency conversion in microresonators has revolutionised modern-day nonlinear and quantum optics. Here, we present a theory of the multimode second harmonic generation under conditions when parametric back to pump spectrum dominates through large domain resonator parameter space. We demonstrate that spectral tunability sideband this regime is governed by discrete sequence so-called Eckhaus in...

We present possibly for the first time Lattice-Boltzmann numerical simulations of thermo-acoustic instabilities premixed flames. study flames interacting with an imposed acoustic field where submitted to a parametric instability can be observed, as well plane re-stabilized by forcing. Self-induced oscillations propagating in narrow channels are also studied, indicating unexpected dependency cha...

A theoretical study analyzing three-dimensional combustion acoustic instabilities in a liquid propellant rocket engine combustor has been conducted. A linear theory based on Crocco’s pressure sensitive time lag model is used. To apply this theory the combustor is divided into two main components, including the combustion chamber and the converging part of the nozzle. The assumption of concentra...

Melt electrowriting (MEW) is a high-resolution additive manufacturing technology that balances multiple parametric variables to arrive at stable fabrication process. The better understanding of this balance underscored here using camera vision jet stability profiles in different electrical fields. Complementing visual information are fiber-diameter measurements obtained precise points, allowing...

We study the emergence of dissipative localized states in phase mismatched singly resonant optical parametric oscillators. These arise two different bistable configurations due to locking front waves connecting coexisting states. In one these configurations, bistability is mediated by coexistence uniform Here are organized a collapsed snaking bifurcation structure. Moreover, undergo oscillatory...

Starting from a general form of the Zakharov equations the relations for electric fields and wave energy distributions at the very beginning of parametric instabilities are derived in dependence on initial Langmuir wave parameters. The corresponding dispersion equations in general and approximative forms are presented. These equations of the order up to eleven, with a different level of physica...

We study the excitation and damping of tides in close binary systems, accounting for the leading order nonlinear corrections to linear tidal theory. These nonlinear corrections include two distinct physical effects: three-mode nonlinear interactions, i.e., the redistribution of energy among stellar modes of oscillation, and nonlinear excitation of stellar normal modes by the time-varying gravit...