By Fred T. Jane
Третий год издания знаменитого справочника по военно-морским флотам. Качество сканирования несколько подкачало, но прочесть и рассмотреть можно почти всё.
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Extra resources for All the world Fightings Ships. Cosmopolitan Naval Annual. 1900.
The mechanics of this excitation is demonstrated by the base-excited deckhouse example of Section 2. The natural frequencies corresponding to the twonoded vertical bending modes of conventional ship hulls can be estimated with reasonable accuracy using either the Burrill (1934−1935) or the Todd (1961) for- 30 VIBRATION mula, of which the latter can take account of the effect of long superstructures. A later formulation was given by Kumai (1968). 07 10 6 Iv 3 iL cpm (127) the two-noded value for the first few modes.
The important point is that the pressure is dominated by the uniform wake effects; the pressure associated with the uniform wake from the lower part of Fig. 12 is essentially identical to the total pressure shown in the upper. The nonuniform wake contribution to the blade-rate pressure is buried at a low level within the large uniform wake component. Interestingly, the integral of the pressure to a vertical force on the relatively flat stern has an entirely different character with regard to the relative contributions of the uniform and nonuniform wake components.
This is the case when the mass of the superstructure is small relative to the effective mass of the hull girder near the coupled natural frequencies of interest. Any consideration of vibratory response versus natural frequencies alone must, on the other hand, allow for the dynamic coupling. This is clear considering the fact that, in the preponderance of cases, superstructure vibration is excited by the hull girder vibration at its base. 1. For obtaining preliminary estimates of superstructure fore-and-aft rocking/bending natural frequencies, the semiempirical method of Hirowatari and Matsumoto (1969) has proved to have great utility (Sandstrom & Smith, 1979).
All the world Fightings Ships. Cosmopolitan Naval Annual. 1900. by Fred T. Jane