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Low to middle vibro-acoustic noise prediction in ship cabin by using plate-cavity coupling model

100%

Zhou Z. , Wu J.

tom S 2

149--157

A plate-cavity coupling method based on modal expansion technique in the closed sound cavity was introduced, aiming at ship cabin structural noise. Using this method, a coupled equation was established. The structural vibration acceleration of the target cabin was extracted from a ship vibration response calculation, applied to the model. Then the target cabin noise value was obtained through numerical calculation. The effectiveness and reliability of the method were validated through experiments. The coupled model predicts noise in the cabin does not require fluid finite element model of the cabin air, thus greatly reducing the calculation time compared with the pure finite element method. It was shown that the method is suitable for the calculation of noise in a single ship cabin; the method has a high calculation efficiency. Furthermore, the calculated result is a continuum. On the one hand, it can be conveniently converted to an octave or 1/3 octave according to the specification. On the other hand, the form of the continuum also provides a corresponding response to the subsequent vibration and noise control.

Household's changes in rural areas. Analysis models

86%

Eglite A.

nr 2

57-63

The paper has a theoretical and practical discussion about the household. There are provide the dynamic model of monetary indices system and the pattern of domestic accounting are developed, as well as the results of methodological evaluation for a five-person household in the countryside of Latvia. The developed analysis models for private households enable household advisory services to elaborate the methodological basis.

Referat stanowi teoretyczną i praktyczną dyskusję na temat gospodarstw domowych. Przedstawia zarówno model systemu wskaźników finansowych oraz wzorzec księgowości gospodarstw domowych, jak i metodologiczną ocenę pięcioosobowego gospodarstwa na Łotwie. Rozwinięte modele analityczne gospodarstw domowych pozwalają instytucjom doradczym na dokładne opracowanie podstaw metodologicznych do prowadzenia szkoleń w omawianym zakresie.