弹性阻尼簧片减振器动力学仿真及疲劳寿命分析
发布时间：2019-03-14 11:37
【摘要】：弹性阻尼簧片减振器在减小船舶推进轴系的扭转振动方面起着十分重要的作用，安装减振器后，可通过改变轴系扭振系统的固有频率来降低轴系的扭振。利用减振器的减振作用，还可以有效地保护柴油机曲轴、凸轮轴、中间轴和螺旋桨轴，并消除轴系的临界频率，从而避免柴油机曲轴在禁止速度范围内工作。弹性阻尼簧片减振器通常安装在柴油机曲轴的自由端，由内部构件和外部构件两部分组成，二者之间置有簧片组。由于运行过程中主簧片和簧片组件反复弯折，承受交变载荷，减振器构件疲劳寿命问题必须加以重视。因此，开展弹性阻尼簧片减振器动力学仿真及疲劳寿命分析，对提高减振器运行安全的可靠性，具有十分重要的理论意义和工程实用价值。 论文应用多体系统动力学理论和疲劳寿命分析方法，并结合有限元数值仿真技术，对弹性阻尼簧片减振器进行动力学仿真及疲劳寿命计算。本文的主要研究工作如下： ①以柴油机推进轴系扭振系统为研究对象，对轴系扭振进行研究，建立了船舶推进轴系扭转振动系统的简化模型和集中参数模型，运用Holzer表格法和瞬态动力学方法对轴系的自由振动和强迫振动进行了计算。 ②在Ansys中建立了弹性阻尼簧片减振器模态分析模型，采用分块Lanczos法对簧片减振器进行模态分析，计算簧片减振器的固有频率及固有振型。 ③在ANSYS/LS-DYNA软件中，对弹性阻尼簧片减振器进行网格离散，生成多体接触动力有限元模型；通过动力接触有限元仿真分析，得出簧片减振器的应力云图、花键轴与主簧片间动态接触力曲线、簧片组件间动态接触力曲线，，以及减振器等效应力时间历程。 ④以减振器运转过程中花键轴和主簧片之间的动态接触力为疲劳分析的载荷谱，基于GL规范计算簧片减振器材料的S-N曲线，结合减振器静力分析所得的应力应变结果，利用ANSYS/FE-SAFE软件中的名义应力法对簧片减振器进行疲劳寿命分析，得出减振器的对数疲劳寿命及疲劳安全系数，对簧片减振器疲劳寿命影响因素进行分析。
[Abstract]:Elastic damping Reed damper plays a very important role in reducing torsional vibration of ship propulsion shafts. After installing the damper, the torsional vibration of shafting can be reduced by changing the natural frequency of shafting torsional vibration system. By using the vibration absorber, the crankshaft, camshaft, intermediate shaft and propeller shaft of diesel engine can be effectively protected, and the critical frequency of shaft system can be eliminated, so that the crankshaft of diesel engine can not work in the forbidden speed range. Elastic damping spring damper is usually installed at the free end of diesel engine crankshaft, which consists of two parts: internal component and external component, and there is a Reed set between them. Due to the repeated bending of the main Reed and the spring assembly and the bearing of alternating load, the fatigue life of the shock absorber must be paid attention to. Therefore, the dynamic simulation and fatigue life analysis of elastic damping spring damper have very important theoretical significance and engineering practical value to improve the reliability of vibration absorber operation safety. In this paper, the dynamic simulation and fatigue life calculation of elastic damping spring damper are carried out by means of multi-body system dynamics theory and fatigue life analysis method, combined with finite element numerical simulation technology. The main work of this paper is as follows: (1) taking the torsional vibration system of diesel propulsion shafting as the research object, the torsional vibration of the shafting is studied, and the simplified model and the lumped parameter model of the torsional vibration system of the marine propulsion shafting are established. The free vibration and forced vibration of shafting are calculated by Holzer table method and transient dynamic method. (2) the modal analysis model of elastic damping spring damper is established in Ansys. The modal analysis of spring damper is carried out by block Lanczos method, and the natural frequency and mode shape of spring damper are calculated. (3) in ANSYS/LS-DYNA software, the elastic damping spring damper is discretized to generate a multi-body contact dynamic finite element model. Through the finite element simulation analysis of dynamic contact, the stress cloud diagram of spring damper, the dynamic contact force curve between spline shaft and main spring, the dynamic contact force curve between Reed assembly and the equivalent stress time history of damper are obtained. (4) the dynamic contact force between spline shaft and main Reed during vibration absorber operation is taken as the load spectrum of fatigue analysis. Based on the GL criterion, the S-N curve of spring damper material is calculated, and the stress-strain results obtained from static analysis of shock absorber are combined with the stress-strain results obtained by static analysis of shock absorber. The fatigue life of spring damper is analyzed by using the nominal stress method in ANSYS/FE-SAFE software. The logarithmic fatigue life and fatigue safety factor of the damper are obtained, and the factors affecting the fatigue life of the damper are analyzed.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535.1
本文编号：2439944
[Abstract]:Elastic damping Reed damper plays a very important role in reducing torsional vibration of ship propulsion shafts. After installing the damper, the torsional vibration of shafting can be reduced by changing the natural frequency of shafting torsional vibration system. By using the vibration absorber, the crankshaft, camshaft, intermediate shaft and propeller shaft of diesel engine can be effectively protected, and the critical frequency of shaft system can be eliminated, so that the crankshaft of diesel engine can not work in the forbidden speed range. Elastic damping spring damper is usually installed at the free end of diesel engine crankshaft, which consists of two parts: internal component and external component, and there is a Reed set between them. Due to the repeated bending of the main Reed and the spring assembly and the bearing of alternating load, the fatigue life of the shock absorber must be paid attention to. Therefore, the dynamic simulation and fatigue life analysis of elastic damping spring damper have very important theoretical significance and engineering practical value to improve the reliability of vibration absorber operation safety. In this paper, the dynamic simulation and fatigue life calculation of elastic damping spring damper are carried out by means of multi-body system dynamics theory and fatigue life analysis method, combined with finite element numerical simulation technology. The main work of this paper is as follows: (1) taking the torsional vibration system of diesel propulsion shafting as the research object, the torsional vibration of the shafting is studied, and the simplified model and the lumped parameter model of the torsional vibration system of the marine propulsion shafting are established. The free vibration and forced vibration of shafting are calculated by Holzer table method and transient dynamic method. (2) the modal analysis model of elastic damping spring damper is established in Ansys. The modal analysis of spring damper is carried out by block Lanczos method, and the natural frequency and mode shape of spring damper are calculated. (3) in ANSYS/LS-DYNA software, the elastic damping spring damper is discretized to generate a multi-body contact dynamic finite element model. Through the finite element simulation analysis of dynamic contact, the stress cloud diagram of spring damper, the dynamic contact force curve between spline shaft and main spring, the dynamic contact force curve between Reed assembly and the equivalent stress time history of damper are obtained. (4) the dynamic contact force between spline shaft and main Reed during vibration absorber operation is taken as the load spectrum of fatigue analysis. Based on the GL criterion, the S-N curve of spring damper material is calculated, and the stress-strain results obtained from static analysis of shock absorber are combined with the stress-strain results obtained by static analysis of shock absorber. The fatigue life of spring damper is analyzed by using the nominal stress method in ANSYS/FE-SAFE software. The logarithmic fatigue life and fatigue safety factor of the damper are obtained, and the factors affecting the fatigue life of the damper are analyzed.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535.1
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