曲轴齿轮啮合冲击及过盈配合的有限元分析

利用有限元理论和数值计算方法,对曲轴齿轮和惰轮啮合状态进行了冲击载荷作用下的动应力分析,并对曲轴齿轮和曲轴段的过盈配合状态作了接触有限元计算.通过对曲轴齿轮综合接触应力和齿根应力的计算分析,为曲轴齿轮的设计和改进提供了理论依据.     

曲轴齿轮和曲轴的过盈联接技术研究

以某发动机曲轴齿轮为例,研究齿轮与曲轴之间过盈量的确定方法及影响过盈量的主要因素。通过理论计算确定过盈联接齿轮与轴之间不产生打滑所需的最小过盈量及满足材料屈服极限所需的最大过盈量,并选择合适的配合类型。然后通过理论计算与有限元法相结合来验证有限元模型的有效性。建立参数化的有限元分析模型,分别确定过盈量与各影响因素之间的关系。     

齿轮和曲轴配合轴段间过盈联结的有限元分析

通过建立以结构强度限制确定的过盈量为上限和以承受最大扭矩不打滑原则确定的过盈配合量为下限的有限元模型，对齿轮和曲轴配合轴段间的过盈联结进行分析研究，从中找出影响过盈联结接触状态的主要因素，以及过盈量与各影响因素之间的关系。     

发动机曲轴齿轮过盈接触有限元分析研究

结合某发动机曲轴齿轮过盈装配的实际参数,建立了三维实体模型,采用有限元分析方法,对曲轴齿轮过盈装配进行计算分析,探讨了曲轴齿轮过盈装配时最大主应力、等效应力、接触压力等随过盈量的变化关系,为后续的曲轴齿轮过盈装配设计分析提供参考依据。     

粉末冶金齿轮与齿轴过盈配合分析

通过对粉末冶金齿轮与齿轴过盈配合的分析,合理选择了齿轮和齿轴的过盈量及粉末冶金齿轮的强度,既保证了传递一定扭矩,又防止了粉末冶金齿轮运转中脆裂失效。     

基于静力子结构技术对轮轴接触下车轮的强度分析

利用有限元分析中的静力子结构技术,在考虑轮轴过盈配合接触非线性情况下,利用有限计算资源,应用有限元方法快速完成车轮的强度分析。计算结果表明,采用此方法可以更加真实而准确地反映车轮在多载荷工况下的应力分布。     

薄壁轴瓦的设计计算与改善

目前,薄壁轴瓦的设计计算仍采用两个无限长圆筒体过盈配合的弹性理论分析结果。但是,随着轴瓦厚径比的减小,这种计算方法对轴瓦的设计计算和轴瓦失效的分析已过于粗略。本文将轴瓦作为一薄壁弹性组合曲板,得到了有摩擦力时轴瓦的应力与应变的方程,作为轴瓦设计计算的基础,并以此对轴瓦的某些失效现象进行分析。     

EC_301旋转叶轮整体结构应力分析

通过对闭式离心叶轮ＥＣ—３０１的整体结构三维应力分析．提出了一种用温度处理过盈配合．用通用有限元分析程序对旋转叶轮进行整体结构应力分析的新方法。同时给出了确定叶轮与轴之间适宜过盈量和判断松脱的方法．     

HXN5型机车轮对压装工艺仿真研究

采用有限元软件ABAQUS建立机车轮对过盈配合的有限元模型,对HXN5型机车轮对压装过程进行弹性数值模拟,分析了不同过盈量和不同摩擦系数对压装压力曲线、最终压装压力的影响,对实际生产具有一定参考意义.     

汽轮机套装叶轮接触问题的有限元分析

提出了一种利用接触单元处理汽轮机中叶轮与轴的过盈配合问题,并运用有限元分析软件ANSYS进行分析,该方法为精确分析接触面间的过盈量及叶轮、轴的应力分布情况提供了有效手段。     

大功率柴油机曲轴飞轮圆锥过盈联结设计方法

针对某型柴油机螺栓端面压紧联结方式在发动机功率进一步强化时发生了部分螺栓松脱、甚至螺栓和定位销被剪断的情况,对该联结方式做了改进,将原先的端面压紧联结改为圆锥过盈联结。通过经典弹性力学方法计算出合理的过盈量以保证联结的可靠性;同时采用有限元仿真软件ABAQUS得到了连接面接触应力的分布情况,验证了过盈量的合理性;分析了危险区域的应力集中现象,提出了降低应力集中的优化方案。     

Vibration analysis of blade-disc coupled structure of compressor

While a 3D assembly model of blade-disc structure was established, a finite element model for calculating the vibration characteristics during blade-disc coupling was built by taking into consideration the coupling action of contact stress between the blade and the disc. The vibration characteristics of the blade-disc coupling structure was calculated and analyzed using cycle analysis method with the aid of ANSYS software. The modeling experiment shows that this method is feasible for analyzing the rabbet assembly structure.     

Finite Element Analysis of Heat Partition in a Pad/Disc Brake System

The heat partition ratio is an important input parameter in simulation carried out by the finite element method (FEM) of the transient temperature fields in such elements as brakes, a pad, and a disc. Therefore, the aim of this article is to study the influence of nine various (experimental and theoretical) formulas for heat partition ratio on temperature in a pad/disc tribosystem. The real dimensions, operating conditions, and thermophysical properties of materials of two different disc brake systems were adopted for the finite element analysis. The evolutions of the temperature on the contact surface of the pad, obtained for different heat partition ratios, are compared with corresponding experimental data. The results revealed a significant influence of heat partition ratio on the evolution of pad maximal temperature, whereas the disc contact temperature was reasonably stable and coincided with most cases under consideration.     

涡轮盘-片耦合场及接触问题建模与分析的新方法

针对某燃气轮机盘-片,运用存储与导入的思想提出了一套耦合场及接触问题的建模和分析的新方法。文中采用PRO／E建立了轮盘和叶片的三维实体模型,并结合ANSYS软件建立了其耦合场及接触有限元模型,详细介绍了该问题的有限元分析方法。文章最后给出了算例,其分析结果证明了文中的建模及分析方法是较好的适合工程应用的新方法。     

发动机主轴承座结构强度分析研究

建立了包括缸体、框架、轴瓦、曲轴及连接螺栓的发动机主轴承座网格模型,通过指定不同的接触区域、接触条件、载荷、约束边界条件及多点约束,分别建立了螺栓预紧、轴瓦过盈、曲轴动压力及热负荷四种工况主轴承座强度分析有限元模型。采用二阶修正单元并通过接触主从面上单元的对应性来保证计算精度和收敛性,采用小滑移接触算法计算出各工况下主轴承座的应力和变形情况,根据计算结果,对主轴承座的强度、变形、滑移表面的滑动以及轴瓦背面的压力分布进行了评价,对主轴承座结构提出了改进意见,改进方案满足结构设计要求。     

Three-dimensional FE model for calculation of temperature of a thermosensitive disc

An effect of variations of the temperature-dependent thermophysical properties of materials of a pad and a disc on the temperature generated due to friction was studied. A three-dimensional boundary-value problem of heat conduction of the disc heated locally within the contact area by the moving with the constant deceleration heat flux and the intensity proportional to the specific capacity of friction was formulated. An issue was solved numerically using the finite element method (FEM). The experimental dependences curves of the thermal conductivity and the thermal diffusivity on the temperature ranging from 20 to 500 °C indispensable for the calculations were approximated using Chichinadze's methodology. The comparative analysis of temperature values on the contact surface of the disc obtained with and without influence of temperature dependence of the four different pad and the same quantity of the disc materials was carried out. It was demonstrated that apparent temperature differences arose for each friction couple combining temperature-dependent and constant properties of materials, however, the largest observed discrepancy (13.7%) occurred for the disc made of aluminium alloy series Al MMC. Other disc materials i.e. iron alloy series FCD50, cast iron ChNMKh and steel EI-696 revealed relatively equal temperature differences of order of 6.4%. Furthermore incorporated in the formula for the heat partition temperature variability of the thermophysical properties of materials affected the resulting contact temperature of the disc for friction couple combined exclusively with the titanium pad VT-14 (3.1%).