模态

The main purpose of this study is to detect the multiple cracks of an aluminum plate with stiffeners by wavelet transforms.

本研究主要是利用小波包节点范数来制作带有加强材之铝合金平板的第一模态振型值，并且利用二维离散小波分析来侦测裂缝之所在位置。

Using the measurement system to measure some stators and achieving good results.

利用所开发的测试系统进行一些定子的面内振动模态测试，取得了较好的结果。

Although a dual-mode scramjets configuration is simple and mainly consists of inlet, combustor and wake nozzle, its working process is complicated, especially in the combustor, involving a lot of subjects, including hypersonic aerodynamics, combustion chemistry, etc.

虽然双模态冲压发动机结构简单，主要由进气道、燃烧室和尾喷管三部分组成，但其工作过程却十分复杂，尤以超音速燃烧室的工作规律最为复杂，设计难度最大。

From the analysis of automobile vibration sources and the human responses to vibration, a mechanic model of man-chair-vehicle system with 13 degrees of freedom is built by vibration pattern analyzing technology. Using the random vibration theory, the calculating methods are developed for parameters, including vibration pattern, transfer function, wheel transient load, and acceleration of seat, automobile ride quality simulation software is developed.

通过分析汽车振动源和人体对振动的反应，用模态综合技术，建立了十三自由度人－椅－车系统的动力学模型，运用随机振动理论，给出了振动形态、传递函数、悬架动挠度、车轮动载荷、座椅加速度等参量的计算方法，开发了一套&汽车平顺性仿真软件&并利用已有的汽车数据，对汽车行驶时的振动特性进行了仿真，得到了重要结论：发动机与轮胎刚度、阻尼，后桥阻尼对驾驶员座椅处的振动影响不大；驾驶员座椅的垂直刚度增加很大时，对垂直方向振动响应比较大；前桥刚度、阻尼对驾驶员座椅处的振动影响较大；前轮胎刚度对前桥振动影响较大，前轮胎刚度增加，则振动加强；后桥刚度对汽车平顺性有一定影响，后桥刚度减小，则座椅处垂直加速度减小。

On the basis of Reiters model of default reasoning, a new modal operator has been introduced, and a cognitive model of default reasoning has been proposed.

在Reiter缺省推理的基础之上，引进新的模态算子，提出了认知缺省推理的模型。

Based on this, the surface sound pressure and outside sound field are computed. For the pipe under consideration, it is shown that the thickness of pipe and coupling mode may influence on vibro-acoustic radiation to some extent.

通过对管道声振模型的计算分析，发现壳体厚度、耦合振动模态等因素对结构声辐射具有一定的影响。

Using the software of I-DEAS, the dynamic finite element model of entire reducer was established including gear, ring plate, shaft, bearing and gearbox housing and used to analyze the vibration modal, the time-domain and frequency domain dynamic response and one-third octave velocity grade structural borne noise of double ring gear reducer under dynamic excitation.

利用I-DEAS软件，建立了包括齿轮、环板、传动轴、轴承和箱体的整个减速器系统的动力有限元分析模型，计算了减速器的振动模态、动态激励下的时域和频域响应，以及速度级1/3倍频程结构噪声。

Modal analysis ; non destructive tests ; steel penstocks ; injuries

模态分析；无损检验；压力钢管；损伤

The HHT is applied to array acoustic logging signal processing, and EMD is used to decompose the signal into several IMF, and then the smooth pseudo Wigner-Ville distribution is obtained.

将该方法应用于阵列声波测井信号处理上，对声波测井信号进行经验模态分解并得到各阶IMF，对IMF分量作平滑伪Wigner-Ville时频分布，通过分析得到干层与水层之间的差异。

Antiaircraft missile ; Aeroelasticity ; Servo system ; Quasi steady theory~+; Modal method~+; Nyquist method~+; Stability analysis

防空导弹；气动弹性；伺服系统；准定常理论；模态法；乃奎斯特法；稳定性分析

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。