Showing papers in "Journal of Sound and Vibration in 1991"

TL;DR: In this article, a new parameter called curvature mode shape is investigated as a possible candidate for identifying and locating damage in a structure, and it is shown that the absolute changes in the curvature shape are localized in the region of damage and hence can be used to detect damage.

TL;DR: In this paper, the authors investigated the possibility of dissipating mechanical energy with piezoelectric material shunted with passive electrical circuits, and derived the effective mechanical impedance for the piezolectric element shunted by an arbitrary circuit.

TL;DR: In this article, the singularities caused by grazing impact are studied using analytical methods, and it is shown that as a stable periodic orbit comes to grazing impact under the control of a single parameter, a special type of bifurcation occurs.

TL;DR: In this article, a method of analysis of the effect of two open cracks on the frequencies of the natural flexural vibrations in a cantilever beam is presented, and two types of cracks are considered: double-sided and single-sided.

TL;DR: In this article, the Taylor series expansion of the forces about the equilibrium point is used to model small-amplitude motions of dynamic systems (structural, fluid, control, etc.) about an equilibrium state.

TL;DR: In this paper, the frequency response characteristics of a non-linear geared rotor bearing system with time-varying mesh stiffness k h ( t ) are examined, and the governing equations are solved using digital simulation technique and only the primary resonances are studied.

TL;DR: In this paper, a theoretical model for the aero-acoustic sources responsible for low-frequency self-sustained pulsations in pipes with closed side branches is proposed.

TL;DR: In this article, the nonlinear frequency response characteristics of a geared rotor-bearing system are examined, and the applicability of both analytical and numerical solution techniques to the multi-DOF nonlinear problem is investigated.

TL;DR: In this article, the dynamic problem of a simple supported beam subjected to a constant force moving at a constant speed is discussed, and analytical and finite element solutions to this fundamental moving load problem are presented.

TL;DR: In this paper, a higher-order plate theory is used in each individual layer to determine the natural frequencies and the relative stress and deflection distributions through the thickness of simply supported rectangular plates.

TL;DR: In this paper, a technique for the calculation of the time domain averages of the tooth meshing vibration of the individual planet gears and of the sun gear in an epicyclic gearbox is presented.

TL;DR: In this paper, a method for calculating the periodic solutions of non-linear mechanical systems with analytical nonlinearities is proposed, and the Jordan normalization procedure for the case of nonlinear autonomous systems is described and generalized to dampened harmonically excited oscillators.

TL;DR: A new efficient numerical scheme for the stability analysis of linear systems with periodic parameters is suggested based on the idea that the state vector and the periodic matrix of the system can be expanded in terms of Chebyshev polynomials over the principal period.

TL;DR: In this paper, a numerical model is described which enables the sound field in the region of outdoor noise barriers to be calculated by using the boundary element method, and the non-uniqueness of solution of the method, producing unreliable results in some conditions, is discussed.

TL;DR: In this paper, the dynamic behaviour of a section of whirling drill collars is analyzed in terms of rotor dynamics, with account taken of the nonlinear influences caused by drilling fluid, stabilizer clearance and stabilizer friction.

TL;DR: In this paper, the effect of fluid on the natural frequencies of circular plates vibrating axisymmetrically in contact with fluid was investigated. And the authors obtained the non-dimensionalized added virtual mass incremental (NAVMI) factor for circular plates having simply supported, clamped and free edges using the integral transformation technique in conjunction with the dual integral equation method.

TL;DR: In this article, active control of sound radiation from a rectangular panel by two different methods has been experimentally studied and compared and two main mechanisms for attenuation of radiated sound were observed to occur.

TL;DR: In this paper, the hierarchical finite element method is used to determine the natural frequencies and modes of a flat, rectangular plate, including free edges and point supports, under different boundary conditions.

TL;DR: In this paper, a method for calculating the non-linear mode shapes and natural frequencies of fully clamped beams at large vibration amplitudes is presented, and results are compared with those of previous studies and of experimental measurements.

TL;DR: In this paper, a single-degree-of-freedom nonlinear system subjected to periodic excitation is considered and the steady state response is analyzed by an extended incremental harmonic balance (IHB) method.

TL;DR: In this paper, a six-degree-of-freedom semi-definite model with time varying mesh stiffness has been developed for the dynamic analysis of spur gears, including a spur gear pair, two shafts, two inertias representing load and prime mover, and bearings.

TL;DR: In this paper, an exact analytical method for the vibration response of a finite, three-layered, rectangular sandwich plate with a visco-elastic core, subjected to a harmonic line force which varies sinusoidally across the plate.

TL;DR: In this article, the feasibility of using all-pole and all-zero model approximations of room transfer functions was examined especially in respect to the degree that such approximation models are suitable for removing room reverberation from signals.

TL;DR: In this article, a linear model for the corrugation of rails is described and the study of a transfer function between the initial wheel and rail roughness and the wear rate spectra in the contact patch is presented.

TL;DR: In this paper, the coupled nonlinear equations of motion of a sagged cable in its first symmetric mode of in-plane and out-of-plane oscillations are solved by the method of multiple scales for its forced vibration response.

TL;DR: In this article, the use of a direct velocity feedback controller to attenuate actively vortex-induced vibrations of a flexible circular cylinder is described, which relies on its operation on an electromagnetic actuator, placed at a critical location inside the cylinder, to generate the control action necessary to resist the flow-induced excitations.

TL;DR: In this paper, an identification procedure to determine the crack characteristics (location and size of the crack) from dynamic measurements is developed and tested, based on minimization of either the mean-square or the maximum measure of difference between measurement data (natural frequencies and mode shapes) and the corresponding predictions obtained from the computational model.

TL;DR: In this article, the Coulomb model is used to compute the dynamic response of a structure constrained by friction interfaces, and a single-term harmonic balance scheme, together with the receptance approach of decoupling the effect of the friction force on the structure from those of the external forces has been utilized to obtain the steady state response.