ACTIVE MINIMIZATION OF ACOUSTIC POTENTIAL ENERGY IN ACOUSTOELASTICALLY COUPLED SYSTEMS - AN ANALYTICAL APPROACH

Analysis of near field sound radiation from a resonant unbaffled plate using simplified analytical models Inalpolat, Murat; Çalışkan, Mehmet; Singh, Rajendra (Institute of Noise Control Engineering (INCE), 2010-03-01) Near field radiation behavior of an unbaffled square plate with free edges, which is excited by a harmonic force at its midpoint, is analytically, computationally and experimentally studied. Emphasis is on the applicability of simplified analytical models to predict the near field sound pressures and spatially-averaged surface and acoustic intensities. First, the plate is computationally discretized into equal segments that are replaced by simple, phase-correlated discrete acoustic sources. Piston radiator ...
Adaptive Fading UKF with Q-Adaptation: Application to Picosatellite Attitude Estimation Söken, Halil Ersin (American Society of Civil Engineers (ASCE), 2013-07-01) The unscented Kalman filter (UKF) is a filtering algorithm that gives sufficiently good estimation results for estimation problems of nonlinear systems even when high nonlinearity is in question. However, in the case of system uncertainty the UKF becomes inaccurate and diverges in time. In other words, if any change occurs in the process noise covariance, which is known a priori, the filter fails. This study introduces a novel adaptive fading UKF algorithm based on the correction of process noise covariance...
Effect analysis of bearing and interface dynamics on tool point FRF for chatter stability in machine tools by using a new analytical model for spindle-tool assemblies Ertuerk, A.; Özgüven, Hasan Nevzat; Budak, E. (Elsevier BV, 2007-01-01) Self-excited vibration of the tool, regenerative chatter, can be predicted and eliminated if the stability lobe diagram of the spindle-holder-tool assembly is known. Regardless of the approach being used, analytically or numerically, forming the stability lobe diagram of an assembly implies knowing the point frequency response function (FRF) in receptance form at the tool tip. In this paper, it is aimed to study the effects of spindle-holder and holder-tool interface dynamics, as well as the effects of indi...
Nonlinear structural modification and nonlinear coupling Kalaycioglu, Taner; Özgüven, Hasan Nevzat (Elsevier BV, 2014-06-03) Structural modification methods were proved to be very useful for large structures, especially when modification is local. Although there may be inherent nonlinearities in a structural system in various forms such as clearances, friction and cubic stiffness, most of the structural modification methods are for linear systems. The method proposed in this work is a structural modification/coupling method developed previously, and extended to systems with nonlinear modification and coupling. The method is most ...
Free forming of locally heated specimens Okman, O.; Ozmen, M.; Huwiler, H.; Tekkaya, A. E. (Elsevier BV, 2007-06-01) A novel manufacturing method is investigated, in which a steep temperature gradient within the workpiece is induced to facilitate material flow locally. By this method, complex shapes can be formed without complicated dies. The feasibility of the idea is analyzed experimentally and numerically. Local heating is realized either by means of induction or laser heating. Experiments using materials 16MnCr5, X5CrNi18/9, and Ti6Al4V have been conducted under various process conditions. These experiments have also ...

Citation Formats

G. ARZU and C. MEHMET, “ACTIVE MINIMIZATION OF ACOUSTIC POTENTIAL ENERGY IN ACOUSTOELASTICALLY COUPLED SYSTEMS - AN ANALYTICAL APPROACH,” 1993, p. 785, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/64689.