Self-excited oscillation
WebOct 17, 2012 · Nonlinear self-excited thermoacoustic oscillations appear in systems involving confined combustion in the form of coupled acoustic pressure oscillations and … WebOct 1, 2000 · Combustors with fuel-spray atomizers are susceptible to a low-frequency oscillation, particularly at idle and sub-idle conditions. For aero-engine combustors, the frequency of this oscillation is typically in the range 50–120 Hz and is commonly called “rumble.” In the current work, computational fluid dynamics (CFD) is used to simulate this …
Self-excited oscillation
Did you know?
WebApr 8, 2024 · A novel self-excited oscillating mixer is developed for the descaling of strip steel, which synthesizes the post-mixed abrasive water jet and self-excited oscillation. The realizable k-ɛ model is selected to investigate the effects of different abrasive entrance, inlet pressure, mixing chamber diameter, and length on the jet characteristics. WebJun 11, 2024 · Morel investigated self-excited cavitation waterjets induced by a gas jet through an axisymmetric cavity, as shown in Figure 1, and discovered that self-resonating oscillations involved three mechanisms.
WebJan 6, 2024 · A mass-spring-damper system subjected to a displacement-dependent excitation force is developed to investigate the features in generalized self-excited oscillating systems. This work lays a solid foundation for understanding self-excited oscillation and provides design guidelines for self-sustainable soft robots. Received 23 … WebJun 10, 1991 · 1, a kind of self-excited oscillation pulsed jet nozzle, chamber wall 3 upper-thin-lower-thicks that it is characterized in that the resonance chamber 1 of this nozzle, form up big and down small...
WebApr 1, 2013 · Self-oscillation is the generation and maintenance of a periodic motion by a source of power that lacks a corresponding periodicity: the oscillation itself controls the phase with which the power source acts on it. WebJun 11, 2024 · In the self-excited cavitation waterjet issued from the axisymmetric cavity, the oscillations of the shear layer corresponded to three orders of hydrodynamic modes. …
WebJul 1, 2024 · A method of stabilizing the self-excited oscillation of a cantilevered pipe conveying fluid because of non–self-adjointness is proposed theoretically and experimentally. Complex eigenvalues...
WebThis paper investigates certain complex oscillatory phenomena taking place in multivariable relay control systems. A frequency based approach is applied, by making use of such tools of frequency-domain analysis as the Locus of a Perturbed Relay おりもの うっすら血 生理前WebThis article presents the application of a self-excited acoustic SAS system for non-destructive testing (NDT) for roof-bolt housings in laboratory and real mine conditions. The proposed system with a filtering mechanism was applied to the J64-27 composite anchors. The conducted tests allowed successful confirmation of the usefulness of the system in … partus sine complicationeWebJul 1, 1990 · Abstract We analyze the linearized version of an analytical model, which combines linear ocean dynamics with a simple version of the Bjerknes hypothesis for El Niño. The ocean is represented by linear shallow water equations on an equatorial beta-plane. It is driven by zonal wind stress, which is assumed to have a fixed spatial form. … partu professional vacuum sealerWebJan 1, 2009 · Self-excitedoscillations are encountered in a number of practical applications includingbrakes, clutches, belts, tires, and violins. To go beyond thederivation of the … おりもの シートWebApr 14, 2024 · A self-excited oscillating pulsed abrasive water jet polishing method is proposed to solve the problems of low removal efficiency in traditional abrasive water jet polishing and the influence of an external flow field on the material surface removal rate. おりもの-シートWebApr 25, 2011 · Therefore, a bounded saturation type feedback with controllable time-delay is proposed for inducing self-excited oscillations. The feedback signal is essentially an infinite weighted sum of a nonlinear function of the state variables of the system measured at equal intervals in the past. More recent is the measurement, higher is the weight. おりものシート 毛WebAug 19, 2024 · A self-oscillating microcantilever in a feedback loop comprised of a gain, a saturator, and an adjustable phase-shifter is used to measure the viscosity of Newtonian fluids. Shifting the signal of the loop with the adjustable phase-shifter causes sudden jumps in the oscillation frequency of the cantilever. おりものシート かぶれ