螺栓松动边界下纤维增强复合薄板的振动测试方法

提出了基于预埋压力传感器的量化测试方法,研究了螺栓松动边界对纤维增强复合薄板振动特性的影响。首先,自主设计并开发了带有预埋压力传感器的螺栓松动边界下复合薄板的振动测试系统,并详细介绍了系统各个部件的组成和功能;然后,归纳出一套合理、规范的松动边界下复合薄板的振动测试流程,并对HF10碳纤维/树脂复合薄板进行了实际测试。结果表明:随着螺栓松动程度的不断增加,复合薄板的固有频率逐渐降低,模态振型的节线位置也发生了不同程度的变化,但其阻尼结果呈现先增大后减小的趋势;而共振和非共振响应呈现先减小后增大的趋势。     

On the Operation sup for Subcategories of mer

We study properties of the operation , defined for structures corresponding to different subcategories of MER, as merotopies, filter merotopies, contiguities, -contiguities and closures. In particular, we examine commutativity of and the operation according to which a structure induces a structure of another type (as e.g.\ a merotopy induces a closure) and the inverse operations of the former.     

弹性支承有间隙的复合转子系统的混沌特性

用近代非线性动力学理论分析了支承有间隙的调整对对称刚性复合转子系统的复杂运动,用数值方法得到系统在某些参数区域内的轴心轨迹图、Poincare映射图和分岔图,讨论了转速变化时出现的周期、倍周期、拟周期和混沌运动,分析结果为定性地改善转子系统的稳定运动状态提供了理论依据。     

Coarsest and finest structures inducing a structure of a given subcategory of MER

The purpose of the paper is to present some kind of characterization for coarsest or finest elements in a subcategory of MER that induce an element of another given subcategory. This revised version was published online in June 2006 with corrections to the Cover Date.     

带有两端支座松动故障的转子系统的振动分析

应用现代非线性动力学理论，分析了带有两端支座松动故障的转子-轴承系统的复杂运动现象。模拟结果表明：带有两端支座松动故障的转子-轴承系统运动在未到共振区时以周期运动为主，在过共振区后，运动形式以拟周期和混沌为主，两个松动支座的振动在一定程度上相互抑制。同时，当支座发生松动时，轴颈的轴心轨迹以及支座的Poincare截面图和相轨迹都呈现出特殊的形状，并且这些形状又随松动支座的振幅是否达到最大间隙值而有所不同。上述结论可望为转子-轴承系统的松动故障的研究及故障诊断提供理论参考。     

Monogenic objects in subcategories of MER

As it is well-known, a structure C belonging to one of the subcategories of MER, induces another structure C' belonging to another subcategory. The purpose of the paper is to investigate those C' that can be induced by a single C. This revised version was published online in August 2006 with corrections to the Cover Date.     

不平衡量对非线性多转子系统动力特性的影响

用近代非线性动力学理论分析了弹性支承有间隙和摩擦的非线性刚性多转子系统的复杂运动．建立了支座有间隙和有摩擦的弹性支承的力学模型．导出了这类多转子系统的运动微分方程组．用数值方法得到系统在某些参数区域内的轴心轨迹图，Poincare映射图和分岔图等．以转子不平衡量为控制参数讨论了进出混沌区的不同路径和系统各种形式的拟周期，倍周期和混沌运动．分析结果为定性地改善转子系统的稳定运行状态提供了理论依据．     

裂纹转子在支承松动时的振动特性研究

以具有支承松动的Jeffcott裂纹转子为研究对象，分析了支承松动和轴上横向裂纹对转子系统刚度的影响，建立了转子系统振动的微分方程，并用数值方法分析了其振动特性。分析表明，转子在裂纹和支承松动这两种非线性因素的作用下，表现出复杂的非线性行为。