Rotating Shell Dynamics by Hua Li

By Hua Li

There are a number of engineering purposes for high-speed rotating buildings which rotate approximately their symmetric axes. for instance, free-flight sub-munition projectiles rotate at excessive speeds so that it will in achieving an aerodynamically-stable flight.

This is the 1st e-book of its style to supply a finished and systematic description of rotating shell dynamics. It not just presents the fundamental derivation of the dynamic governing equations for rotating shells, yet records benchmark effects at no cost vibration, serious pace and parametric resonance. it really is written in an easy and transparent demeanour making it obtainable either the professional and graduate student.

  • The first monograph to supply an in depth description of rotating shell dynamics
  • Dynamic difficulties corresponding to unfastened vibration and dynamic balance are tested intimately, for uncomplicated shells of revolutions

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Example text

It appears that the frequencies f~ and ff* generally decreases with n until the m i n i m u m frequencies are reached, upon which they will subsequently increase with n. For a rotating cylindrical shell with larger L/R ratio, the m i n i m u m frequency parameters of both the traveling waves usually occur at lower circumferential wave number n. 002, L/R = 5). 037571 For example, the m i n i m u m frequency parameters of the traveling waves occur at n = 5 if the ratio L/R -- 5, and occur at n = 4 if the ratio L/R = 10.

All the frequencies of both backward and forward waves are always larger than those of the stationary shell after the fundamental frequency is attained. For any rotating velocity, the difference between the natural frequencies of the forward and backward waves is always greater for a smaller circumferential wave number, and this difference diminishes as the circumferential wave number increases. 002, L/R -- 20). 035627 b e t w e e n the natural frequencies of the two waves is small c o m p a r e d with the corresponding case when the rotating velocity is high.

1. In the figure, R is the constant mean radius, while the length and the thickness of the cylindrical shell are denoted by L and h, respectively. 1 Geometry and coordinate system of a rotating cylindrical shell. cylindrical shell is taken to be the middle surface on which an orthogonal coordinate system (x, 0, z) is fixed. Deformations of the rotating cylindrical shell are defined by u, v, and w in the longitudinal x, circumferential 0 and normal z-directions, respectively. 3) Based on the above descriptions, substituting Eqs.

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