This study analyzes the characteristics of hybrid propulsion shafting and builds mathematical models and vibration equations of shafting using the lumped parameter method. Main focus is on the asymmetric double diesel propulsion shafting operation process and the impact of the phase angle and motor excitation on torsional vibration of shafting. Model result is validated by testing results conducted on double diesel propulsion shafting bench. Mathematical model and model-building methods of shafting are correct.

对于舰船或大型船舶轴系,由于其转速高、轴系超长等特点,进行轴系回旋振动计算时,采用传统的传递矩阵法求解往往容易出现数值不稳定和漏根现象,严重影响轴系固有特性计算的准确性,与轴系的实际运转情况不符.采用基于有限元法的计算模型,能较真实地反映物理模型,且计算精度高.分析考虑多种因素对回旋振动的影响,利用可视化编程软件VB与ANSYS参数化设计语言混合编程,实现回旋振动软件开发并通过实例验证了算法及软件的正确性.软件界面友好、使用方便、计算效率高,能满足舰船轴系回旋振动计算的需要.

Propulsion shaft, which is absorbing various loads in navigation, is significant in marine power plant. Based on the position relationship of shaft centerline and mass center, this paper derived unbalance force formula with coupling misalignment. Mathematical model of forced whirling vibration response magni-tude is established. Simulation calculation is carried out on a test bench and a ship’s shafting, experiment as well as test is also included. The result shows that coupling misalignment has effect on shaft vibration re-sponse magnitude.

Through the analysis of the characteristics of torsional vibration of the marine propulsion shafting system with nonlinear components, a single-mass nonlinear torsional vibration equation was established, and then the general equations for multi-DOF nonlinear torsional vibration of the system were derived. Harmonic balance method and perturbation method were used to solve these equations, and the advantage and disadvantage of these methods were analyzed. The general free-vibration formulas were formulated. This work may provide a theoretical guidance and a reference for multi-DOF nonlinear free vibration analysis.

Analysis of the characteristics of hybrid propulsion shafting, mathematical models and vibration equations of shafting are established by the lumped parameter method. Focus on the asymmetric double diesel propulsion shafting operation process, the influence of the phase angle and motor excitation makes on torsional vibration of shafting. Based on the test bench of double diesel propulsion shafting, test values and the theoretical calculation value were analyzed. The result shows that the mathematical models and methods of shafting are correct.

The influence of gear meshing transmission and universal coupling on the torsional vibration of shafting is studied . The calculation model of complex shafting coupled vibration and the vibration model of hybrid system are established .The solu-tion of propulsion shafting vibration system is put forward .The stern position and oil film stiffness on the fulcrum bearing variation optimization rational shafting alignment is obtained .The calculation software of shafting vibration and shafting alignment is devel-oped.On the basis of theoretical research , the test method of propulsion shafting vibration test and alignment test is carried out . Test instrument of the shafting vibration and alignment are developed , which provides a powerful technical support for the engi-neering application of the theoretical analysis .

Hybrid propulsion system is a new type of dynamic form. It has the characteristic structural complexity and the diversity of operating conditions. Due to the different vessel functions, different sailing areas or different control performance requirements of the ship, types of hybrid propulsion systems are not the same. In this paper, 6000HP platform supply vessel is an example. Hybrid propulsion the system is selected by the fuzzy comprehensive evaluation method.

针对船舶推进轴系中常用的油膜轴承,基于雷诺方程推导了轴承负荷对油膜流体形变的影响关系,建立了油膜轴承的动力学特性数学模型,应用有限元方法,建立相应的轴系回旋振动模型.以某实船数据为对象,根据不同的轴承负荷进行了仿真计算与模态分析.计算结果表明,轴承负荷的大小与其作用的轴承位置对轴系回旋振动固有频率有一定影响.

通过螺旋桨桨叶与冰块的相互作用过程,建立单冰块对螺旋桨扭转振动的激励函数;同时建立机电耦合振动数学模型,推导得到机电耦联动力学方程,研究电机电磁激励力对扭转振动的影响.以3500吨科考船电力推进轴系为研究对象,基于冰载荷激励力和电磁激励力对轴系扭转振动进行分析,为复杂的船舶电力推进轴系在冰区航行时的振动研究奠定了基础.

本文以某船舶混合动力推进系统为研究对象，分析其振动机理及建立复杂推进系统振动数学模型。选取混合动力推进轴系典型扭转振动运行工况进行计算与分析，研究其 扭转振动特性；同时借助混合动力推进轴系校中与回旋振动数学模型，阐述设计阶段轴承布置的合理性对其有重要意义。该研究为对混合动力推进系统的低噪声设计理论 研究及工程设计具有一定的指导意义。

In high load-carrying bearing-rotor system, bearings’ places usually change for load distribution or in continual work. It influences the system’s stability, and brings out different vibration response in rotor system. This article puts forward mathematical model of bearing’s stiffness under load which is calculated from bearing displacement. Then through numerical integration it studies system’s rotating vibration with different bearing settings. The results of the analysis show that bearing displacement has a great effect on dynamic characteristics of the bearing-rotor system.

基于CFX的滑移网格技术预报伴流场下螺旋桨的非定常水动力性能,为螺旋桨激振力数值计算提供可行的思路.以桨舵系统为计算分析对象,比较分析了均匀来流下螺旋桨的定常和非定常水动力性能的差别;计算了理论伴流下螺旋桨的非定常水动力性能,将所得结果与理论伴流的趋势进行了比较分析,验证了CFD计算模型的准确性.预报伴流场下螺旋桨的激振力,将计算结果与文献所给建议值进行了比较分析.结果表明,该方法可有效预报螺旋桨激振力,能够代替经验公式求解螺旋桨激振扭矩.

提要 在轴系合理校中过程中,目前仅仅是考虑单一目标函数进行最优化校中,而在实际校中过程中需要考虑多因素进行校中.本文考虑多目标因素下的合理校中,根据各目标对象所占的权重比,利用层次分析法求出满足轴系校中各项要求的轴承合理变位可行值.

对混合动力推进系统噪声的产生机理、低噪声轴系的设计方法及其控制技术的国内外研究进展进行较全面系统的综述.具体内容包括混合动力推进系统激励力研究、噪声产生机理分析、低噪声轴系设计方法研究.重点关注船舶推进轴系低噪声技术方面的研究进展,包括柴油机减振降噪改进设计、低噪声螺旋桨、复合材料,以及相关控制技术,并对今后的研究工作提出一些建议.

Through the establishment of motor electromechanical coupling vibration model, torsional vibration characteristics of motor is analyzed in starting process. With 1000T lubricating oil ship electric propulsion shafting as the object of study, the free vibration and the forced vibration characteristics are analyzed. In two cases of considering the electromagnetic excitation torque and without considering the electromagnetic excitation torque, the responded vibration of electric propulsion shafting is calculated. The low noise design of the motor and propulsion shafting provides a theoretical basis.

From the calculation method of natural frequency of single-rotor system whirling vibration, this article puts forward corresponding dynamic equations. Several modeling of single-rotor system are established, with different numbers of shaft elements, relative number of degrees of freedom, four types of modeling the shaft and disk interface. Error and accuracy of natural frequency are analyzed with modeling properties. The above all mentioned results make it possible to summary influence characteristics of modeling for rotor system.