查询词典 mistuning

of the mistuning effects on thedynamics of the bladed disk are summarized. The bladed disk assemblies are cyclic symmetry structures.

谐调叶盘系统为循环对称结构，而失谐的存在破坏了这种循环对称性，并造成叶盘系统模态的局部化现象。

Cyclic symmetry in blade-disc assembles is often destroyed by small differences in the individual blades'structural properties that result from manufacturing and material tolerance, this phenomenon commonly knows as mistuning.

建立了某汽轮机叶片—轮盘的有限元模型，研究了离心力对失调叶片—轮盘系统振动的影响；利用概率分析方法，研究了所有叶片弹性模量在5%误差范围内随机失调叶片—轮盘振动情况。

The effects of this special mistuning type onthe features of the vibratory response of the bladed disk are studied and summarized.

建立了叶盘系统的有限元模型，探索性地研究了叶盘系统的频率转向与失谐敏感性的相互作用机理问题。

The effects of frequency veering features on mode localization of the mistuned system were analyzed with L. It is shown that the distance between the frequency veering curves at nodal diameters is a key parameter, and it exists a minimum value for the parameter, around which blade modes are very sensitive to mistuning, and can result in dramatic fluctuation of the mode localization degree.

研究表明，频率转向曲线之间关于节径的最小间隙是反映频率转向特征的重要参数，并存在一个转向频率间隙的极小值点，在该极值点附近，频率转向区内的模态对叶片失谐非常敏感，并会导致模态局部化程度剧烈变化。

Features of forced response of the mistuned bladed disk under different system parameters like coupling degree, mistuning strength, viscous damping and non-linear friction strength were investigated.

研究失谐叶盘系统在不同的耦合强度、失谐程度、粘性阻尼系数、干摩擦强度等系统参数影响下的受迫响应特性。

Theeffects of mistuning on the forced response are also analyzed in the frequency veeringregion. The outcomes of this dissertation improve the fundamental theories of thevibration localization of the mistuned bladed disk.

研究表明：在频率转向区中，叶盘系统模态高度密集，从而更容易导致叶盘系统产生较强的模态振型和振动响应的局部化。

The deterministic and statistic methods are employed respectively to study theforced response of the mistuned bladed disk under various system parameters withrespect to the deterministic and random mistuning. In the statistic analysis, wepropose a method that calculates and compares the statistics of the maximum andaverage vibratory responses.

在进行统计分析时，特别地提出了对失谐叶盘系统的最大振动响应和平均振动响应进行统计和比较的分析方法，利用该方法可对失谐叶盘系统振动能量的集中程度进行分析，从而更全面地认识失谐叶盘系统振动响应的局部化特性。

Because the error mainly comes from theresonant region, the error correction method can only be used in resonant region, andcan effectively improve the efficiency of the statistical analyzing solutions. Two types of the mistuned bladed disks, whose friction damping are blade dryfriction damping and blade-to-blade dry friction damping, are modeled respectively. Amulti-harmonic method which can employ the fast Fourier transformationtechnique is proposed to investigate the vibratory response of the bladed disks withthese two types of nonlinear friction damping. Formulations of the solution for thesetwo types of motion functions are deduced. The characteristics of the forced responseof the bladed disks with these two dry friction damping are analyzed and summarizedunder various system parameters. The vibratory response of the bladed disk with dryfriction scatter mistuning is investigated.

针对叶盘系统中两类主要的非线性干摩擦阻尼形式，分别建立了具有叶片干摩擦阻尼和叶间干摩擦阻尼的失谐叶盘系统的非线性力学模型；提出了一种可利用快速傅立叶变换技术的多谐波分析方法；分别推导了具有这两类干摩擦阻尼形式的叶盘系统运动方程的求解公式；在各种系统参数条件下，研究了干摩擦阻尼失谐叶盘系统的受迫振动响应特性；对具有干摩擦散乱失谐的叶盘系统振动响应进行了研究，分析总结了干摩擦散乱失谐对叶盘系统振动响应特性的特殊影响规律。

Based on the flutter equation developed, the influences of mistuning level and distribution on the flutter characteristics of the assemblies are investigated in detail, and two criteria for distribution optimization are proposed. The influences of structural coupling on the effectiveness of mistuning on flutter control are studied.

根据建立的颤振方程，详细研究了失调分布对非谐调叶盘颤振特性的影响，给出了最优错频分布的两个准则，研究了结构耦合对错频抑制颤振效果的影响。

The results show that mistuning is always beneficial to alleviating flutter, that the alternative and the optimum distribution of mistuning have nearly same effects on alleviation flutter under intensive structural coupling and mistuning is limited in the improving of the stability of the system.

研究表明，错频对抑颤总是有利的，在较强的结构耦合作用下，交叉错频分布与最优错频分布具有相近的抑颤效果，且错频对提高系统的稳定性是有限的。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。