By Anders Nilsson, Bilong Liu
This three-volume publication supplies a radical and complete presentation of vibration and acoustic theories. assorted from conventional textbooks which generally take care of a few features of both acoustic or vibration difficulties, it truly is distinct of this e-book to mix these correlated matters jointly. furthermore, it presents basic research and mathematical descriptions for a number of the most important phenomena of Vibro-Acoustics that are rather priceless in noise aid, together with how constructions are excited, power flows from an excitation element to a legitimate radiating floor, and at last how a constitution radiates noise to a surrounding fluid. Many dimension effects incorporated within the textual content make the studying attention-grabbing and informative. Problems/questions are indexed on the finish of every bankruptcy and the suggestions are supplied. this may support the readers to appreciate the subjects of Vibro-Acoustics extra deeply. The ebook could be of curiosity to someone drawn to sound and vibration, automobile acoustics, send acoustics and inside plane noise.
This is the 1st quantity, and covers the next themes: Mechanical structures with one measure of freedom, Frequency area, Waves in solids, interplay among longitudinal and transverse waves, normal wave equation, Wave attenuation because of losses and transmission throughout junctions, Longitudinal vibrations of finite beams, Flexural vibrations of finite beams, Flexural vibrations of finite plates.
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Additional resources for Vibro-Acoustics, Volume 1
3. 1 Determine the energy dissipated over one period for a simple mass–spring system if the losses are (a) viscous and (b) hysteretic. Assume that the displacement of the mass is described by x(t) = x0 sin(ωt). 2 The displacement of the mass of a simple mass–spring system is given by x(t) = x0 sin(ωt). Determine the force required to maintain this motion if the damping force is due to (i) viscous losses and (ii) frictional losses. In a diagram, show the force as function of displacement. Make some appropriate assumption concerning the magnitude of the properties m, k0 , c and Fd .
Thus, the autocorrelation function of a harmonic signal is a harmonic function with the same period as the signal. 24) The time average of the product between a random and a harmonic function is equal to zero. The cross terms in Eq. 24) are consequently eliminated. 25) The derivatives with respect to τ should be the same for the two expressions. 27) If x(t) is stationary and describes the displacement of a structure and x(t) ˙ is the velocity at that point, then the time average of the product between velocity and displacement is equal to zero.
7 Time Averages of Power and Energy It is often of great interest to determine the time averages of kinetic and potential energies of a mechanical system. These energies can be determined as functions of the FT of displacement and velocity. The time average of the square of a signal x(t) is according to Eq. 49) 0 The time average of the power input to a system is equal to the average of the product between force and velocity, or in a general way, between the signals x(t) and y(t). Thus, 46 2 Frequency Domain E[x y] = Rx y (0) = 1 2π ∞ −∞ Sx y (ω)dω From Eqs.