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首页> 外文期刊>Journal of marine science and technology >Design and analysis of the propulsion shafting system in a ship with single stern tube bearing
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Design and analysis of the propulsion shafting system in a ship with single stern tube bearing

机译：单船管轴承船舶推进轴承系统的设计与分析

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In recently constructed vessels, minimization of engine room volume is required to maximize the volume of cargo to be shipped. Therefore, the main engine and the stern bulkhead mounted on the ship are installed as far as possible in the aftward direction. As a result, the length of the propeller shaft is reduced, along with the stern tube bearing span used to support it. In this case, the shaft flexibility is reduced, the reaction influence number is increased, and the point load of each bearing is easily influenced by change in displacement. Because the point load of each bearing is susceptible to hull deformation and thermal expansion, it is difficult to adjust the shaft arrangement and the bearing load change after large adjustment of the shaft arrangement. Therefore, in the past, the bearing was arranged to support the propeller shaft with two forward and afterward stern tube bearings. However, when the main engine and the stern bulkhead are installed as far aftward as possible to minimize the volume of the engine room, it is necessary to provide shaft flexibility by removing the forward stern tube bearing. As a result, the resonance revolution of the propeller blades during whirling vibration of the propulsion shafting system falls within the range of normal operating revolutions. This means that abnormal wear of the stern tube bearing, damage to the stern tube sealing device, and hull structure vibration may occur due to the whirling vibration. In this paper, the characteristics of shafting alignment and whirling vibration of a ship supporting a propeller shaft with double and single stern tube bearings are compared. Moreover, the changes in shaft flexibility and the characteristics of the whirling vibration of a corresponding shafting system in a 50 K-DWT petroleum product tanker were explored by applying a single stern tube bearing. In addition, the shafting alignment and whirling vibration are determined according to the installation position of the intermediate shaft bearing. A method is suggested for selecting the optimal shafting arrangement by which to secure the shaft flexibility of a ship to which a single stern tube bearing is applied, and to avoid resonance from the whirling vibration.
机译：在最近构造的血管中，需要最小化发动机室的体积来最大化要发货的货物量。因此，在船上安装在船上的主发动机和船尾舱壁在船尾方向上安装。结果，螺旋桨轴的长度减小，以及用于支撑它的船尾轴承跨度。在这种情况下，轴柔性降低，反应影响数量增加，并且每个轴承的点载荷容易受到位移变化的影响。因为每个轴承的点载荷易受船体变形和热膨胀，所以难以在大调节轴布置后调节轴布置和轴承负载变化。因此，在过去，轴承布置成支撑具有两个前向和后方船管轴承的螺旋桨轴。然而，当主发动机和船尾舱壁尽可能最小化发动机室的体积时，需要通过去除前向船尾管轴承来提供轴柔性。结果，在推进轴承系统的旋转振动期间螺旋桨叶片的共振旋转落在正常操作转速范围内。这意味着由于旋转振动，船尾管轴承的异常磨损，船尾密封装置的损坏和船体结构振动可能发生。在本文中，比较了支撑具有双和单船管轴承的螺旋桨轴的船的朝向对准和旋转振动的特性。此外，通过施加单个船尾管轴承探索了50k-DWT石油产品油罐机中相应的备道系统在50k-DWT石油产品油罐机中的旋转振动的变化。另外，根据中间轴轴承的安装位置确定轴切对准和旋转振动。建议采用方法来选择最佳轴系布置，通过该方法来保护施加单个船管轴承的船的轴柔性，并避免从旋转振动谐振。

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