模态

This paper describes the principle and method, by which the modal parameters of symmetrical plane structures can be measured by means of ganeral simple exciters and measurement instruments.

本文描述了用简单的通用激振器和测量仪器测量对称平面结构模态参数的原理和方法。

In the third part, modeling the shell of fan in finite element method, the mode analysis and harmonic analysis are carried out for two shell different in thickness.

第三部分建立了风机外壳的有限元模型，在ANSYS软件中对其做了模态分析和动力响应分析，分析了厚度不同的风机外壳的振动特性。

Chapter seven studies the methods of finding resonance frequency of centrifugal worm housing, analyses the relationship between the sound radiation of fan and wheel tip velocity index under different worm housing sound impedance and a new noise control method is presented for centrifugal fan.

第七章，研究了离心风机蜗壳基频共振频率及高阶模态频率的确定方法，分析了蜗壳声阻抗及其对叶轮声辐射轮缘速度指数的影响，为风机的降噪提供了一种新的途径。

In summary, when it is laterally impacted by flat-nosed rigid cylindrical missile at the center, the deformation course, final mode, local dent and energy distribution of a free-free tube are different from those of a free-free beam and a supported tube.

概括起来，当受到子弹的对心侧向正冲击时，自由管的变形历程、变形模态、局部破坏形式以及能量分配方式和自由梁以及有支撑的圆柱壳有很大的不同。

Because of the thin thickness, the skin of gun-bay structure, the frame plane, the oil tank floor, and the plane that hold up the smoke of aircraft gun is considered as shell element.

运用Lanczos算法对炮舱结构有限元模型进行模态分析，得到炮舱结构前20阶的固有频率和振型，分析前6阶频率下炮舱整体结构以及炮梁的振动特点。

Based on the background of practical engineering , modal parameters identification of a steel frame structure in this paper .

本文依照实际工程的背景，对一个钢框架结构模型进行模态参数识别。

A histogram showing the frequency of genome sizes for these 2802 species reveals a strongly skewed distribution with a very small modal size of 0-7 pg ( 675 Mbp), well within the bottom I % of the ange.

直方图显示频率的基因组大小为这些为2802种，揭示了强烈的分配倾斜与一个很小的模态的大小0-7编号（ 675人的MBP ），以及内部的底部i ％的昂热。

All mechanical loads are considered, including internal pressure, gravity, wind load and earthquake load, in which the modal analysis of the drum, functional wind load and temporal analysis for earthquake are the innovations of this paper.

分析焦炭塔在机械载荷，如内压、自重、风载和地震载荷作用下的应力情况，其中塔体的模态分析、风载的函数加载和地震载荷的时程分析是本文的创新。

The static and dynamic characteristics of the beam of a gantry-type machining center are analyzed by means of ADAMS and ANSYS. Considering effect of gravity and cutting forces, the static deformation of the beam is obtained after calculating the interacting forces between the guide and the slide block by ADAMS. Moreover, the contact parameters of the guide surface are acquired by dynamic tests and parameter identification, then they are applied to the simulation model of the beam-slide box system, whose natural frequencies and modal shapes are achieved by modal analysis. Furthermore, the effect of changes of the contact parameters on the dynamic behavior of the beam-slide box system is also investigated.

对一种国产龙门式加工中心的横梁关键部件，采用机械系统多刚体动力学仿真软件ADAMS和有限元分析软件ANSYS进行了静动态特性分析；在考虑重力和切削力作用下，由ADAMS计算出导轨与滑块间的作用力，从而计算出横梁部件的静态变形；通过动态测试和参数辨识方法获得导轨结合面特性参数并将其应用到横梁滑箱系统整体有限元模型中，经过模态分析得到系统固有频率和各阶振型图，并进一步分析了结合面参数变化对横梁滑箱系统整体动态特性的影响。

The normal direction motion of the head block tips is excited by the anti-symmetrical mode.

利用定子的对称和反对称振动模态，在驱动足上形成椭圆振动轨迹。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷