船体固有振動数の研究(第4報)

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For the purpose of obtaining the approximate formulae of estimating the natural circular frequency a_n, the logarithmic decrement δ_n, and the amplitude A_n caused by the exciting force of known magnitude F, the author has carried out some investigations, the results of which are as follows.(1) a_n=√(El_0g)/(w_0l^4) ((m_n^4+X-n))/((1+Z_n)(1+r_n)) (2) δ_n=πa_n{1/(1+r_n)α+(r_n)/(1+r_n)β+1/(a_n^2(1+Z_n)(1+r_n))γ} (3) A_n=(Fl^8)/(EI_0)・(πu_n(x)u_n(l_1))/(δ_n(m_n^4+X_n)) The results of calculations by the use of these approximate formulae to the actual cargo ships on which the author had carried out the vibration tests by means of vibration exciter are compared with the data experimentally obtained, and it is shown that if the magnitude and the location of exciting force on board a vessel are given, it is possible to estimate not only the natural frequency but also the order of amplitude of her vibration.
社団法人日本船舶海洋工学会の論文