Showing papers in "Journal of Sound and Vibration in 1974"

TL;DR: In this paper, the dynamics and stability of flexible pipes containing flowing fluid are examined in a general way and it is shown that conservative systems are subject not only to buckling (divergence) at sufficiently high flow velocities, but also to oscillatory instabilities (flutter) at higher flow velocity.

TL;DR: In this article, a clamped-free beam with a finite mass, M, at the free end is analyzed for different (concentrated mass)/(beam mass) ratios, M/Mv.

TL;DR: In this paper, the analysis of flexural vibration of unsymmetrical sandwich beams and plates, with viscoelastic cores, has been carried out and the influence of inclusion of inertia effects, other than transverse ones, on the response due to forced harmonic excitation has been reported.

TL;DR: In this article, a novel method of local wall acoustic impedance measurement has been proved both feasible and viable for application to the walls of flow ducts with particular reference to the gas turbine environment.

TL;DR: In this article, a method is presented for using the finite element technique to evaluate the phase constant of an arbitrary periodic structure, which is applied to two types of periodic construction, a periodically supported infinite beam and a skin rib structure.

TL;DR: In this paper, an algorithm is developed to solve the classical problem of the dynamic response of a finite elastic beam supporting a moving mass, and the results are shown to compare very well with experimental results.

TL;DR: In this article, a unified analytical technique is presented for the prediction of both the discrete frequency and broadband acoustic signatures generated by aerodynamic rotors, based on a simplified point dipole, quasi-steady aerodynamic blade model for a B-bladed rotor.

TL;DR: In this paper, the authors deal with wind tunnel experiments in which measurements were made of the unsteady aerodynamic force acting on a bar with square cross section which was subjected to a forced sinusoidal oscillation in a heaving mode.

TL;DR: In this article, a theory is presented describing the noise generated by open rotors operating at supersonic tip speeds, based upon a combination of the LighthiIl aerodynamic sound theory and the Whitham weak shock theory.

TL;DR: In this article, the vibration response of a spacecraft shroud to a range of in-flight fluctuation pressures was analyzed using an Atlas-Agena 15 degree cone-cylinder shroud and three critical flight Mach numbers were considered.

TL;DR: The effects of aircraft noise on teaching and classroom activity were studied in a number of schools close to Heathrow Airport, both by direct observation and by a small sample survey of teachers' opinions as discussed by the authors.

TL;DR: In this article, it was shown that the acceleration of the shear wave is strongly influenced by the mean flow due to propellant combustion; for larger values of burning surface Mach number, the speed of propagation approaches that of the combustion gases.

TL;DR: In this article, the effects of transverse shear deformations and rotatory intertia on a cylindrical shell are studied on the basis of a shell theory in which the effect of the transverse deformations is retained.

TL;DR: In this article, the existence of combination resonances of columns under periodic axial loads has been surveyed for four typical cases of boundary conditions, and the effects of external and internal damping on combination resonance are discussed.

TL;DR: In this paper, the free vibrations of elastic beams with nonuniform characteristics are investigated theoretically by a new method, which combines the advantages of a finite element approach and of a Rayleigh-Ritz analysis.

TL;DR: In this paper, a rotationally periodic structure consisting of a finite number of identical sub-structures forming a closed ring is considered, and all the modes can be found from matrix analyses of a single sub-structure.

TL;DR: In this article, it was shown that for a regular sampled stationary randomly excited n degree-of-freedom differential equation model and the corresponding mixed autoregressive-moving average (AR-MA) time series of order 2n that is known to represent the sample sequence, the coefficient of variation (the ratio of the standard deviation to the mean) of natural frequency and damping parameters, can be of the order of 0·01 and 0·2 for N=1000 regularly sampled vibration observations and that the theoretically achievable values of cf and cξ have the following properties:

TL;DR: In this article, the authors examined the influence of the shape of the mean-velocity profile on the attenuation rate of acoustic propagation through a lined two-dimensional duct and found that the results from the "turbulent" boundary-layer profiles differ significantly from the results of the other profiles even when compared on the basis of displacement thickness.

TL;DR: Some of the simpler and more reliable techniques for measuring the complex modulus properties of elastomeric and other materials, as functions of frequency, temperature and strain, are reviewed.

TL;DR: In this paper, the effect of the simplifying assumption of zero hoop and shear strains on the natural frequencies of fixed-free circular cylindrical shells has been investigated and the results are compared with the experimental observations.

TL;DR: In this paper, a theoretical and experimental investigation of the vibrations of axially loaded stiffened cylindrical shells is presented, and three sets of equilibrium equations and boundary conditions are derived from the Donnell and Flugge theories.

TL;DR: In this paper, the interaction of a turbulent boundary layer with a compliant surface is studied experimentally in a rotating disk geometry, and a wave structure in the compliant surface-liquid interface develops when the quotient (free stream fluid velocity) × (square root of the liquid density) exceeds a critical value.

TL;DR: In this paper, the stability of columns on Winkler type elastic foundations subjected to stationary forces (conservative or non-conservative) is studied and a theorem on the influence of the foundation on the critical load is derived.

TL;DR: In this article, simple polynomial approximations and Galerkin's method are used to determine the fundamental frequency of vibration of thin, elastic plates with symmetric slope restraints and subjected to a bi-axial state of tensile stresses.

TL;DR: In this article, some aspects of diffraction theory relevant to design and performance of noise barriers are described and a suggestion for improving attenuation provided by an acoustic screen is put forward, and a diffraction model for noise barrier design is presented.

TL;DR: In this paper, a method is described for predicting the rise and decay of the noise (the noise profile) of a passing train, and good agreement between the predictions of the method and measured train noise profiles has been obtained.

TL;DR: In this article, the classical Rayleigh-Ritz method in conjunction with suitable co-ordinate transformations is found to be effective for accurate estimation of natural frequencies of circumferentially truncated circular sector plates with simply supported straight edges.

TL;DR: In this paper, the authors analyzed the radiated power due to a prescribed transverse beam motion by modeling the beam as a finite, long, slender strip with a thin elliptical cross section.