H22(3)压缩机活塞杆、十字头颈断裂的故障分析

通过对活塞杆实际受力的强度核算,找出了引起活塞杆及十字头断裂的事故原因,根据设备的实际状况,制定了技术改造方案并实施,使问题得以解决。     

On the instantaneous and average piston friction of swash plate type hydraulic axial piston machines

Piston friction is one of the important but complicated sources of energy loss of a hydraulic axial piston machine. In this paper, two formulas are derived for estimating instantaneous piston friction force and average piston friction moment loss. The derived formula can be applicable for piston guides with or without bushing as well as for axial piston machines of motoring and pumping operations. Through the formula derivation, a typical curve shape of friction force found from several experimental measurements during one revolution of a machine is clearly explained in this paper that it is mainly due to the equivalent friction coefficient dependent on its angular position. Stribeck curve effect can easily be incorporated into the formula by replacing outer and inner friction coefficients at both edges of a piston with the coefficient given by Manring (1999) considering mixed/boundary lubrication effects. Novel feature of the derived formula is that it is represented only by physical dimensions of a machine, hence it allows to estimate the piston friction force and loss moment of a machine without hardworking experimental test.     

Generalized singular value decomposition in multidimensional condition monitoring of machines—A proposal of comparative diagnostics

With the modern metrology, we can measure almost all variables in the phenomenon field of working machine, and many of measuring quantities can be symptoms of machine condition. On this basis, we can form the symptom observation matrix (SOM) for condition monitoring. From the other side we know that contemporary complex machines may have many modes of failure, so-called faults, which form the fault space. Even if we apply some modern tool like singular value decomposition (SVD) for the fault extraction purpose, this multidimensional problem is not a simple one. Therefore, the question remains if one can learn considering similar problem when having SOM of similar machine observed just before. In this way, we can consider the application of generalized singular value decomposition (GSVD) to the machine condition monitoring problems, and uncover some new possibilities.     

压缩机十字头销故障分析及处理

从断口、设计、操作工况、安装等方面对往复式新氢压缩机Ⅲ级十字头销的断裂故障进行分析，指出连杆小头与十字头碰撞及入口压力降低是故障的主要原因。     

氢气压缩机十字头销断裂故障分析

针对渣油加氢装置氢压机运行中十字头销发生断裂破坏情况，分别从设计强度及操作参数的变化方面对断裂原因进行了分析。结果表明操作条件的变化引起工艺参数的改变是最直接的破坏因素，并提出了相应的改进措施。     

三缸单作用柱塞泵十字头理论计算及有限元分析

介绍将理论与有限元相结合进行三缸单作用柱塞泵十字头强度分析的方法,以某柱塞泵十字头为例阐述理论分析与有限元分析的过程,并找出它的了危险点位置及应力值,且结果与实际情况相吻合.此研究方法,对同类问题的解决具有一定的参考价值.     

斜盘型轴向柱塞马达柱塞受力分析

液压马达作为液压控制系统主要输出执行元件之一,它的性能对整个系统的性能有着重要的影响,因此对它的性能分析有着重要的意义。柱塞副是轴向柱塞马达中关键的摩擦副之一,该文对斜盘型轴向柱塞马达的柱塞副进行了受力分析。文中建立了柱塞副在不同转角位置时受力分析的数学模型,并针对某一马达进行实例分析,为柱塞副结构优化设计提供了参考。     

轴向柱塞泵的模态仿真

以斜盘式轴向柱塞泵作为研究对象,运用有限元分析的方法,对其施加满足实际工况的约束,在计算机容量允许的情况下,选择精度更高的单元和划分更细的网格密度,计算出柱塞泵的固有频率以及模态振型.为了验证有限元法计算结果,又通过实地的振动试验,具体测出了柱塞泵的共振频率,验证了有限元计算结果的正确性.利用经过验证的有限元模型,在计算机上作结构改进仿真设计,找到提高柱塞泵共振频率的措施.通过多种方案比较,本文采用将柱塞泵前端的圆柱滚子轴承改成深沟球轴承,可以实现在不改动柱塞泵其他零件尺寸的前提下,提高柱塞泵的模态频率,使柱塞泵更不易发生共振.     

柱塞泵的合理使用与故障分析

本文根据对冶金液压设备中柱塞泵应用实践与研究，提出合理使用柱塞泵的基本原则，对柱塞泵常见故障产生的原因、排除方法进行了分析，以利于柱塞泵研究设计、生产制造、使用维护者提高柱塞泵的技术性能，对故障进行预防、诊断与排除。     

恒功率变量柱塞泵动特性仿真与研究

基于AMESim软件建立了恒功率变量柱塞泵的仿真模型,调节仿真参数后的压力—流量特性曲线与样本曲线接近,验证了仿真模型的正确性,并通过所建模型分析得出了负载变化、换向阀开度对于恒功率控制柱塞泵变量的影响,为恒功率控制柱塞泵的优化设计提供了理论依据。     

斜盘式柱塞泵柱塞-缸体摩擦副的润滑计算与分析

通过对柱塞-缸体间的油膜厚度进行理论计算与分析,进一步分析柱塞-缸体间的倾角、供给压力、柱塞自转及偏心距等相关因素对油膜压力分布的影响,并从润滑角度提出改善其润滑状态、减少磨损和延长使用寿命的建议.     

发动机活塞的热结构耦合分析

用ANSYS计算了该发动机活塞二维轴对称简化模型单独在燃气压力和燃气温度作用下以及在燃气压力和温度共同作用下的温度分布、应力和位移,并且计算了活塞三维1/4模型的温度场;最后对计算结果进行了全面的综合比较分析.     

压缩机活塞故障分析及处理措施

通过对天然气压缩机活塞和活塞环损坏原因的分析,找出故障的解决对策。     

套装活塞盘式制动器的性能分析

对套装活塞盘式制动器的结构特性对该制动器性能的影响进行了分析,讨论了钳体刚度对制动性能的影响,并对该制动器的台架性能试验结果进行了分析。     

发动机活塞温度场试验与有限元分析

依据发动机活塞的热负荷,介绍热电偶法测量活塞温度的试验方法和过程,建立活塞有限元模型,分析热边界条件的施加方法。计算结果与试验结果很好地拟合,为发动机活塞的耦合分析和结构优化提供了可靠依据。     

A cam-quadrilateral mechanism for power transmission of a twin-rotor piston engine

A quadrilateral with four invariable lengths of sides has the characteristic of transforming the variation of the diagonal length to the variation of its interior angle. Thus, the combination of two quadrilaterals with a cam forms the differential velocity drive mechanism (DVDM) of a novel twin-rotor piston engine (TRPE). The DVDM restricts the two coaxial rotors to rotate with periodical but nonuniform velocity, and the volume of working chambers created by the adjacent vane pistons of the two rotors alternately expands and then contracts. The volumetric change of working chambers is used to generate the four-stroke engine cycle. The kinematic model and the detailed position, velocity, and acceleration analysis results of the TRPE are presented. The results show that this novel engine, associated with the advantages of higher uniformity of torque and power density due to multiple power strokes per revolution of the output shaft, has a compact and totally balanced design.     

混合动力总成的研究与开发

阐述了汽车用混合动力的不同结构型式和特点,分析了混合动力总成的关键技术,并介绍了上海内燃机研究所混合动力研究与开发的情况.     

轴向柱塞泵降噪结构分析

通过对轴向柱塞泵运动、降噪结构的分析,找出了在开式轴向柱塞泵斜盘上开减震槽以降低噪声的有效办法,以适应变排量工况的要求.     

柴油机活塞有限元分析与结构改进

活塞是发动机中工作情况最为恶劣的零部件之一.对495柴油机活塞的温度、热应力及变形、机械应力及变形进行了分析,并给出了活塞的热、机械耦合应力与变形,针对分析结果指出了活塞结构的改进方向.该分析可为类似发动机活塞的分析与结构改进提供理论参考与实践指导.     

中凸型活塞裙部的流体动力润滑分析

结合动力学方程及活塞裙部在缸套内的流体动压润滑方程,运用数值方法研究活塞的二阶运动,分析中凸型线对活塞裙部无量纲位移等方面的影响.通过与直线型线对二阶运动影响结果比较发现,中凸型活塞裙部更利于运转性能的提高.