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| 1 | 滑动轴承动力特性系数动态分析方法显示文摘采用滑动轴承动力特性系数动态分析方法用以研究滑动轴承动力特性系数瞬态响应。分别采用有限元法与有限差分法分析转子瞬态响应与油膜流场压力分布;数值积分油膜压力关于扰动的偏微分项求解滑动轴承动力特性系数;在每个时刻采用学科间迭代方法实现转子响应分析与滑动轴承动力特性系数分析之间的耦合。以某型涡轮增压器转子系统为例,分别采用动态滑动轴承动力特性系数与定滑动轴承动力特性系数分析转子系统瞬态响应;讨论间隙宽度、轴承长度和润滑油粘度对动态滑动轴承动力特性系数的影响,并与文献中的结论进行比对,验证该方法的有效性。 | 李元生 敖良波 李磊 岳珠峰 | 2010 | 机械工程学报2010，46，21： | 26 |
| 2 | 振动切削深孔加工初始偏差对孔直线度误差的影响显示文摘构建了振动切削深孔加工钻杆在轴向振动、振动切削力和切削液流体力影响下的多跨动力学有限元模型。引入自由模态综合技术,将钻杆线性自由度的特征模态进行缩减,仅保留具有非线性动力特征的模态,从而可有效降低耦合系统自由度数,减小计算量。利用该缩减后的模型,研究了辅助支撑位置和加工深度与孔直线度误差的作用关系,获得了孔直线度随初始偏差量变化的规律,为大跨度振动切削深孔加工机床的精度设计和加工误差分析提供了依据。通过试验与数值计算结果的对比,验证了所提出方法的有效性与准确性。 | 李言 孔令飞 | 2012 | 机械工程学报2012，48，13： | 16 |
| 3 | Bifurcation and Chaos Analysis of Nonlinear Rotor System with Axial-grooved Gas-lubricated Journal Bearing Support显示文摘Axial-grooved gas-lubricated journal bearings have been widely applied to precision instrument due to their high accuracy, low friction, low noise and high stability. The rotor system with axial-grooved gas-lubricated journal bearing support is a typical nonlinear dynamic system. The nonlinear analysis measures have to be adopted to analyze the behaviors of the axial-grooved gas-lubricated journal bearing-rotor nonlinear system as the linear analysis measures fail. The bifurcation and chaos of nonlinear rotor system with three axial-grooved gas-lubricated journal bearing support are investigated by nonlinear dynamics theory. A time-dependent mathematical model is established to describe the pressure distribution in the axial-grooved compressible gas-lubricated journal bearing. The time-dependent compressible gas-lubricated Reynolds equation is solved by the differential transformation method. The gyroscopic effect of the rotor supported by gas-lubricated journal bearing with three axial grooves is taken into consideration in the model of the system, and the dynamic equation of motion is calculated by the modified Wilson-θ-based method. To analyze the unbalanced responses of the rotor system supported by finite length gas-lubricated journal bearings, such as bifurcation and chaos, the bifurcation diagram, the orbit diagram, the Poincaré map, the time series and the frequency spectrum are employed. The numerical results reveal that the nonlinear gas film forces have a significant influence on the stability of rotor system and there are the rich nonlinear phenomena, such as the periodic, period-doubling, quasi-periodic, period-4 and chaotic motion, and so on. The proposed models and numerical results can provide a theoretical direction to the design of axial-grooved gas-lubricated journal bearing-rotor system. | ZHANG Yongfang HEI Di Lü Yanjun WANG Quandai MüLLER Norbert | 2014 | Chinese Journal of Mechanical Engineering2014，27，2： | 9 |
| 4 | 周向拉杆转子系统非线性动力行为及稳定性显示文摘针对周向拉杆转子轴承系统,将拉杆简化为无质量、受预紧的线性弹簧,得到周向拉杆提供的附加刚度矩阵和附加广义力矩;对具有粗糙表面的长方微元体进行有限元接触分析,得到不同载荷作用下的法向和切向界面接触刚度;计入界面接触刚度和周向预紧拉杆的影响,采用受轴向载荷的Timoshenko梁轴有限单元建立周向拉杆转子轴承系统的非线性动力学模型。基于系统的局部非线性特性进行自由度缩减后,运用结合预估—校正机理的Poincaré-Newton-Floquet方法对滑动轴承支承下周向拉杆转子系统的非线性动力特性进行研究,得到不同转速和质量偏心下系统稳态周期解的稳定性边界和分岔形式。结果表明,系统存在同步周期解、准周期解和倍周期解对应的参数区域,随着转速的增加,当质量偏心较小时,周期解发生准周期分岔,当质量偏心较大时,周期解发生倍周期分岔。考虑界面接触刚度后,系统的分岔失稳转速降低;预紧不均时,系统在更低的不平衡量下发生倍周期分岔。 | 李辉光 刘恒 虞烈 | 2011 | 机械工程学报2011，47，23： | 8 |
| 5 | 可倾瓦轴承-转子系统非线性动力行为显示文摘运用变分约束原理,在动力积分、迭代过程中修正了流体润滑的Reynolds方程的变分形式,使其等价为变分不等式。运用八节点等参有限元方法,计算了单块瓦的非线性油膜力,并通过组装技术求解得到5瓦可倾瓦滑动轴承的非线性油膜力。运用Poincar映射和Runge-Kutta方法,分析了5瓦可倾瓦滑动轴承支承的对称刚性转子系统的不平衡响应。数据结果显示了可倾瓦轴承-转子系统的周期解、倍周期解和混沌运动等非线性现象。 | 吕延军 张永芳 季丽芳 吴莹 于杨冰 虞烈 | 2010 | 振动.测试与诊断2010，30，5： | 8 |
| 6 | Characteristics of the Main Journal Bearings of an Engine Based on Non-linear Dynamics显示文摘Many simple nonlinear main journal bearing models have been studied theoretically,but the connection to existing engineering system has not been equally investigated.The consideration of the characteristics of engine main journal bearings may provide a prediction of the bearing load and lubrication.Due to the strong non-linear features in bearing lubrication procedure,it is difficult to predict those characteristics.A non-linear dynamic model is described for analyzing the characteristics of engine main journal bearings.Components such as crankshaft,main journals and con rods are found by applying the finite element method.Non-linear spring/dampers are introduced to imitate the constraint and supporting functions provided by the main bearing and oil film.The engine gas pressure is imposed as excitation on the model via the engine piston,con rod,etc.The bearing reaction force is calculated over one engine cycle,and meanwhile,the oil film thickness and pressure distribution are obtained based on Reynolds differential equation.It can be found that the maximum bearing reaction force always occurs when the maximum cylinder pressure arises in the cylinder adjacent to that bearing.The simulated minimum oil film thickness,which is 3 μm,demonstrates the reliability of the main journal bearings.This non-linear dynamic analysis may save computing efforts of engine main bearing design and also is of good precision and close connection to actual engine main journal bearing conditions. | NI Guangjian ZHANG Junhong CHENG Xiaoming | 2009 | Chinese Journal of Mechanical Engineering2009，22，5： | 6 |
| 7 | Duffing系统共存周期解的稳定性与分岔演化显示文摘以Duffing系统为研究对象,将延续算法和打靶法相结合,对系统共存的周期解进行延拓追踪,研究周期解的稳定性与分岔。结合吸引域、相图和Poincaré映射图揭示共存吸引子的吸引域随系统参数变化的侵蚀演变过程。结果表明:Duffing系统普遍存在多周期解的共存现象;鞍结分岔是共存吸引子产生或消失的重要原因,并且会导致其吸引域的拓扑结构发生突变;周期解的叉式分岔产生一个不稳定的周期解和两个稳定的反对称周期解;反对称吸引子的吸引域互相缠绕,导致系统的稳定性降低;当反对称吸引子经倍周期分岔进入或退出混沌时,会发生混沌吸引子的内部激变。 | 张锦涛 王昕 吕小红 金花 | 2022 | 噪声与振动控制2022，42，4： | 1 |
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