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Stability considerations of an anchor dragged in noncohesive sea bed
Abstract The maximum holding power and the stability of stockless anchors dragged in non-cohesive media are considered. Forces and moments acting on each structural element of the anchor, such as flukes, shank and stabilizing fins, were investigated experimentally, and the results are given in formulae. The maximum holding power of an anchor depends upon its configuration in the sea bed. Considering force resultants and moments acting on all the structural elements, equilibrium equations are formulated and the configuration of a dragged anchor and its maximum holding power can be determined by solving these equations. If its equilibrium configuration cannot be determined under the surface of the sea bed, the dragged anchor will turn over as soon as the flukes come out of the bed. This instability will be called lifting-up. Instability phenomena caused by turning around the shank are analysed by considering the resulting moments acting on the anchor in a disturbed condition from the equilibrium configuration. From the results, stability conditions for lifting-up and turning are proposed for the anchor dragged in noncohesive media, and an anchor of absolute-roll-stability is realized by attaching a pair of proper stabilizing fins.
Stability considerations of an anchor dragged in noncohesive sea bed
Abstract The maximum holding power and the stability of stockless anchors dragged in non-cohesive media are considered. Forces and moments acting on each structural element of the anchor, such as flukes, shank and stabilizing fins, were investigated experimentally, and the results are given in formulae. The maximum holding power of an anchor depends upon its configuration in the sea bed. Considering force resultants and moments acting on all the structural elements, equilibrium equations are formulated and the configuration of a dragged anchor and its maximum holding power can be determined by solving these equations. If its equilibrium configuration cannot be determined under the surface of the sea bed, the dragged anchor will turn over as soon as the flukes come out of the bed. This instability will be called lifting-up. Instability phenomena caused by turning around the shank are analysed by considering the resulting moments acting on the anchor in a disturbed condition from the equilibrium configuration. From the results, stability conditions for lifting-up and turning are proposed for the anchor dragged in noncohesive media, and an anchor of absolute-roll-stability is realized by attaching a pair of proper stabilizing fins.
Stability considerations of an anchor dragged in noncohesive sea bed
Ura, Tamaki (author) / Yamamoto, Yoshiyuki (author)
1978-05-13
8 pages
Article (Journal)
Electronic Resource
English
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