錨鎖把駐力に関する実験研究

概要

論文の詳細を見る
In general, the Holding Power of the Chain is represented by the equation T=μ_1ωl when the chain is laid straight to the direction of force ; where μ_1 is the coefficent of friction, ω is a weight per unit length, l is the length of chain. But if the chain is laid with a bend, the above equation cannot be applied and we must introduce the transverse resistance μ_2ω l, then the equations are expressed as, (1) T=T_0e^<-λθ> [numerical formula] ρ=ρ_0e^<-λθ> [numerical formula] (2) [numerical formula] [numerical formula] where λ is μ_1/μ_2 ρ is the radius of curvature, θ is the angle between both ends of chain, x, y are values of co-ordinates of rectangular co-ordinate. In order to ascertain these equations the authors had tested on the transverse resistance and the transformation of chain in model tank, and obtained the conclusions as follows. (a) λ(μ_1/μ_2) is nearly 0.5 with fine sands. (b) The flexible chain makes exponential spirals when dragged on the sandy sea bottom. (c) As we know, the chain slightens the shock load to the anchor with the catenary part. Furthermore we can say that the laid part reduces the magnitude of load by the longitudinal resistance and slightens the directional change of load to the anchor by the transverse resistance.
社団法人日本航海学会の論文
1974-07-31