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PROJECT OF NEW RS REQUIREMENTS FOR ICEBRE AKING PROPELLER STRENGTH SIZES

机译：ICEBRE AKING螺旋桨强度尺寸的新型RS要求项目

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One of the main problem of the modem icebreaker building industry and the normative activity of Classification Societies is ensuring of operating safety for icebreaker propellers This is caused by the high level of ice loads, which act on the icebreaker propeller (IBP) blades at their direct contact with ice. In early 1990s it has become absolutely clear that existing IBP norms don't correspond to modern requirements of designing. Therefore Finland, Canada and Russia cany out intensive studies in this direction. During 1996-2000 years proposals on icebreaker propeller strength requirements has been developed by Russian Maritime Register of Shipping and Kiylov Shipbuilding Research Institute (KSRI). These proposals are the basis of this report. Ice loads are the governing factor for black scantlings assigning. Ice milling regime is taken as main design regime to assign design ice propeller loads. It is shown that blade scantlings of IBP should be assigned proceeding from both the static and fatigue strength. Ice loads are random. Therefore it is necessary to determine intensity of ice loads (frequency, distribution law, extreme values) to calculate fatigue and static strength Analysis of the stress blade condition under action ice loads and IBP blade damage has been performed It is demonstrated that it is necessary to take into account both ice blade bending moment and ice spindle torque to assign IBP blade scantlings. The proposals on these design ice loads for blade scantlings assigning has been developed and submitted The report presents proposals for calculation of permissible stresses proceeding from fatigue and static strength. Based on the calculation of permissible stresses and analysis of blade damage under action ice loads, it is shown that fatigue strength for steel icebreaker propellers is the most important factor for blade scantlings assignment. Based on the presented results, proposals on strength requirements of the open icebreaker propeller have been developed and submitted Checking calculations of IBP blade scantlings have been performed Designing blade scantlings is well coincide with blade scantlings of operating IBP which well recommended by operating experience under severe ice condition At present time the project of requirements to controllable pitch mechanism (CPM) of controllable pitch propeller (CPP) proceeding from selective (pyramidal) and fatigue strength has been developed by RS. The principle of the selective strength means that the failure of a propeller blade under action off-designed conditions (for example when a stopped propeller is dragged through ice) shall not cause damage in other propulsion line components. Within the framework above mentioned project the method to assign the failure blade load, methodology of the fatigue strength calculations, requirements for permissible stresses and for CPM material have been developed and are submitted The report submits the list of main articles, which were used to develop the project of requirements to icebreaking propellers. The numbering corresponding to RS requirements was used in the report.
机译：调制解调器破冰机建筑业的主要问题之一，以及分类社会的规范活动是确保破冰螺旋桨的操作安全，这是由高水平的冰负荷引起的，这在其直接的破冰螺旋桨（IBP）刀片上采取行动与冰接触。在20世纪90年代初，它已成为绝对清楚的是，现有的IBP规范与现代设计要求不符。因此，芬兰，加拿大和俄罗斯在这个方向上的密集研究。在1996 - 2000年期间，俄罗斯海事登记册和Kiylov造船研究所（KSRI）开发了关于破冰船螺旋桨强度要求的提案。这些提案是本报告的基础。冰负荷是黑色扫描分配的控制因素。冰铣制度被视为主要设计制度，以分配设计冰螺旋桨载荷。结果表明，应分配IBP的叶片缩小，从静态和疲劳强度分配。冰负荷是随机的。因此，有必要确定冰负荷（频率，分配法，极值）的强度，以计算应力叶片条件下的疲劳和静态强度分析，并进行IBP叶片损坏，证明了它是必要的考虑到冰刀弯曲矩和冰轴扭矩以分配IBP刀片扫描。制定并提交了这些设计冰负荷的提案，并提交了报告提供了从疲劳和静力量进行的允许应力计算的提案。在计算允许应力和叶片损伤的分析的基础上，表明钢破冰螺旋桨的疲劳强度是刀片扫描分配的最重要因素。基于所提出的结果，已经开发了开放式破冰船螺旋桨强度要求的提案，并提交了IBP刀片扫描的计算，这已经进行了设计刀片扫描良好的刀片扫描良好的操作IBP，这在严重冰下的运营经验建议。目前，可控间距螺旋桨（CPP）从选择性（金字塔）和疲劳强度的可控俯仰机构（CPM）的要求项目的要求已经开发出来。选择性强度的原理意味着螺旋桨叶片在动作下的螺旋桨叶片的故障（例如，当停止螺旋桨通过冰拖动时）不得导致其他推进线组件造成损坏。在上面提到的框架内，已经开发了分配故障刀片负荷的方法，疲劳强度计算的方法，允许的允许应力和CPM材料的要求，并提交了报告提交主要文章名单，用于发展对破冰螺旋桨的要求项目。报告中使用了对应于RS要求的编号。

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