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首页> 外文学位 >TIME-VARYING LATERAL RESPONSE OF A MARINE SHAFTING SYSTEM WITHIN A STERN BEARING (HYDRODYNAMIC, JOURNAL, VIBRATION, DYNAMIC, TRAJECTORY).
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TIME-VARYING LATERAL RESPONSE OF A MARINE SHAFTING SYSTEM WITHIN A STERN BEARING (HYDRODYNAMIC, JOURNAL, VIBRATION, DYNAMIC, TRAJECTORY).

机译：斯特恩轴承内水力轴系统的时变横向响应（水动力，轴颈，振动，动力，弹道）。

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摘要

A new direct iterative method for obtaining the time-varying lateral behavior of a statically indeterminate marine shafting system within its stern, hydrodynamic journal bearing is described. A modified Newmark's method is used to step in time. At each integration time step, an optimization technique iterates between the shafting system and the oil film analyses until a quasi-equilibrium is achieved. The three-dimensional shafting system structural analysis and the two-dimensional oil film hydrodynamic analysis utilize the finite element method. Rectangular, linear elements employing the "hourglass control" method are used for the construction of the oil film fluidity matrix. The bearing housing is modeled as a rigid body supported in two planes by linear springs. The exciting forces are due to a propeller operating in a spatially nonuniform wake field. The effect on the shafting dynamics of the oil filled stern tube, which surrounds a region forward of the stern tube bearing, is examined. Numerical examples are used to verify the method and the algorithm. A comprehensive ship example illustrates the usefulness of the present simulation. A physically reasonable periodic trajectory, reaching 25 percent of the clearance, and the corresponding periodic hydrodynamic bearing resultant forces and moments are achieved after about one shaft revolution.
机译：描述了一种新的直接迭代方法，用于获得船尾水动力轴颈轴承中静定的船用轴系的时变横向行为。修改后的Newmark方法用于及时调整。在每个积分时间步骤中，优化技术都会在轴系和油膜分析之间进行迭代，直到达到准平衡为止。三维轴系系统结构分析和二维油膜流体动力分析采用有限元方法。采用“沙漏控制”方法的矩形线性元件用于油膜流动性矩阵的构造。轴承箱建模为由线性弹簧在两个平面中支撑的刚体。激振力归因于螺旋桨在空间不均匀的尾流场中运行。研究了对充满油的tern管的轴系动力学的影响，which油围绕着tern管轴承的前方区域。数值算例验证了该方法和算法的有效性。一个全面的船舶示例说明了本模拟的有用性。大约旋转一圈后，就可以达到间隙的25％的物理上合理的周期性轨迹以及相应的周期性流体动力轴承合力和力矩。

著录项

  • 作者

    KARNI, ZVI.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Engineering Marine and Ocean.
  • 学位 Ph.D.
  • 年度 1986
  • 页码 172 p.
  • 总页数 172
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋工程;
  • 关键词

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