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Firstly, this paper investigated roundly the basic theory of the ambient vibration method, analyzed systematically the main methods of ambient vibration identification, and discussed their advantages and disadvantages. Then we established the finite element model of structural dynamics and test model and analyzed their mutual relation, improved MUSIC method and correlation function method in the harmonic identification, and gave the subspace method and correlation function method based on continuous model, which is multi-harmonic retrieve technique. And then, this paper also puts forward least-squares method to estimate directly structural physical and modal parameters; this approach replaced the derivative operator in the continuous time model with an equivalent approximation, and estimated the physical parameters of structures by the least-squares method. And then, we discussed the approximation methods of derivative and their convergence. Finally, this paper researched the modal parameters of a frame structure by the simulation and test. The results demonstrated that subspace method, correlation function method and the least-squares method are effective and stable respectively.

全面地研究环境振动识别方法的基本理论,系统地分析环境振动识别方法的主要方法,讨论它们的优点和不足;建立结(来源:6666AB44C论文网www.abclunwen.com)构动力学的有限元模型和试验模型,分析有限元模型与试验模型之间的相互关系;改进谐波识别中的MUSIC识别方法和相关函数识别方法,给出大型结构模态识别的连续型的子空间分解识别方法和相关函数识别方法,这个方法是多元谐波识别方法;提出直接识别结构的物理参数和模态参数的最小二乘方法,这个方法利用导数的近似值代替导数值,并运用最小二乘方法识别结构的物理参数,讨论导数近似值的选择方法,分析算法的收敛性;通过仿真计算和模型实验,研究高层框架结构的模态参数识别,验证子空间分解识别方法、相关函数识别方法和最小二乘识别方法的有效性,算法的稳定性;从理论和试验两个方面分析和研究噪声对识别精度的影响,影响识别精度的因素,以及部分模态成分的模态参数不能够被识别的原因。

The Company is a professional production of long-term flexible coupling, gear-type coupling, flange coupling, coupling roller, slider coupling the main processing unit, my plant has a processing center, CNC Lathe , wire-cutting and all kinds of ordinary cars, milling, planing, grinding and other medium-sized processing equipment totaling more than 30 Units, or in the area of 1500 square meters, and its predecessor was the Wuhan plant, subordinate units of vehicles engaged in precision machining for decades, its technical strong, the company will not only provide high-quality machining products, but also provide a comprehensive service, from product design, processing, manufacturing, packaging, transportation and other integration services, our constant self-perfection, technology continues to improve, put all the targets set up at "Customers are our God" on the basis points.

本公司是一家长期专业生产弹性联轴器、齿型联轴器、凸缘联轴器、滚子联轴器、滑块联轴器为主的加工单位,我厂拥有加工中心,数控车床,线切割及各类普通车、铣、刨、磨等中型加工设备共计三十多台,占在面积1500平方米,其前身是武汉车辆厂的下属单位,从事精密加工数十年,其技术力量雄厚,公司不仅提供品质卓越的机械加工产品,更提供全面周到的服务,从产品设计、加工制造,包装运输等一体化服务,我们不断的完善自我,技术不断提高,把一切目标都建立在"客户是我们的上帝"的基点上。

A more allout study on a novel structure of the micromanipulator has been carried out based on a 6-DOF parallel micromanipulator with decoupled structure in this article.

本文在创新出的运动解耦并联六自由度微动机器人新构型的基础上对其进行了较为全面的研究。

Category: A Type: Semisoft Milk: Cow Origin: USA Good all-around cheese with superior melting qualities. Also slices and grates easily. Excellent table cheese. May have thin rind or no rind at all. Mild and nutty. When aged, dry and dark with pronounced nutty flavor.

类别:A 类型:半软奶:牛奶原产地:美国好的全面型奶酪,带有极好的融化性;也容易切片及磨碎;是很好的餐桌奶酪;可能有薄外壳或根本无外壳;温和、有坚果味;成熟后,干黑,且有明显的坚果味。

Over the past five years, the company has finished the technology transfer and market development and introduced the advanced management concepts and modes from Japan Taiko Kikai Industries Co., Ltd. while digested and absorbed process and manufacturing technologies of SBT treatment plant of ship wastewater and USH ship oil-water separator.

五年来,大晃康达已完成了技术转让以及市场开发工作,在全面消化吸收SBT型船舶污水处理装置及USH型船舶油水分离器的工艺技术和制造技术的同时,还全面导入了日本大晃机械工业株式会的先进管理理念和管理模式。

This text aim at the neutral spot not connect the ground or through eliminate arc coil to conncect ground of connecting a ground of system, put out to connect a ground of electricity arc ability existently low and starts of the system occurrence Human body feeling electricity connect the ground to conduct electricity to press, the equipments inner part breaks down to connect the ground, having no problem of protect the ability.On the foundation of the thorough research protection method, put forward to change into above-mentioned system the protection project that the intelligence connects a ground of system movement.At the same time, introduced the intelligence to connect a ground of composing of system, the work principle, function and characteristicses and system to circulate the circumstance.

本文简要分析了我国配电网自动化的现状和面临的主要问题,指出合理、高效的配电系统网络结构是提高供电可靠性和供电质量的前提条件,本文在对国内现有配网方式进行全面分析的基础上,结合我国城网改造的目标的显状,提出了一种科学&田&字型接线,对其技术性、经济性和可靠性进行了论证,(分析了不同故障情况下系统如何完成故障的定位、隔离,网络的重构及负荷的转移,指出该方案具有很高的供电可靠性和相对较低的备用容量,是一种符合国情国力并能适应配网自动化发展的组网方案);给出了适合该方案的不同控制模式并进行了优劣比较,指出集中远方控制模式划配网自动化发展的必然趋势;最后本文给出了该控制模式下的测控方式。

This first comprehensive analysis includes genes and proteins and their relation to human disease, repeated sequences, comparative genome-wide studies of mammalian orthologous chromosomal regions and rearrangement breakpoints, reconstruction of ancestral karyotypes and the events leading to existing species, rates of variation, and lineage-specific and lineage-independent evolutionary events such as expansion of gene families, orthology relations and protein evolution.

这次全面分析包含了三种动物的基因组序列和蛋白产物以及它们与人类疾病相关性分析,重复序列,哺乳动物同源染色体区域和重排断点的比较基因组研究,祖先核型的重建,产生现有种群的事件,变异率以及种系特异和不依赖种系的事件如基因家族扩展,同源关系以及蛋白进化。人类19号染色体序列被破译了。

This first comprehensive analysis includes genes and proteins and their relation to human disease, repeated sequences, comparative genome-wide studies of mammalian orthologous chromosomal regions and rearrangement breakpoints, reconstruction of ancestral karyotypes and the events leading to existing species, rates of variation, and lineage-specific and lineage-independent evolutionary events such as expansion of gene families, orthology relations and protein evolution.

这次全面分析包含了三种动物的基因组序列和蛋白产物以及它们与人类疾病相关性分析,重复序列,哺乳动物同源染色体区域和重排断点的比较基因组研究,祖先核型的重建,产生现有种群的事件,变异率以及种系特异和不依赖种系的事件如基因家族扩展,同源关系以及蛋白进化。生物谷评论:人类19号染色体序列被破译了。

The Company is a professional production of long-term flexible coupling, gear-type coupling, flange coupling, coupling roller, slider coupling the main processing unit, my plant has a processing center, CNC Lathe , wire-cutting and all kinds of ordinary cars, milling, planing, grinding and other medium-sized processing equipment totaling more than 30 Units, or in the area of 1500 square meters, and its predecessor was the Wuhan plant, subordinate units of vehicles engaged in precision machining for decades, its technical strong, the company will not only provide high-quality machining products, but also provide a comprehensive service, from product design, processing, manufacturing, packaging, transportation and other integration services, our constant self-perfection, technology continues to improve, put all the targets set up at "Customers are our God" on the basis points.

本公司是一家长期专业生产弹性联轴器、齿型联轴器、凸缘联轴器、滚子联轴器、滑块联轴器为主的加工单位,我厂拥有加工中心,数控车床,线切割及各类普通车、铣、刨、磨等中型加工设备共计三十多台,占在面积1500平方米,其前身是武汉车辆厂的下属单位,从事精密加工数十年,其技术力量雄厚,公司不仅提供品质卓越的机械加工产品,更提供全面周到的服务,从产品设计、加工制造,包装运输等一体化服务,我们不断的完善自我,技术不断提高,把一切目标都建立在&客户是我们的上帝&的基点上。

The American Water Spaniel was developed in the United States as an all-around hunting dog, bred to retrieve from skiff or canoes and work ground with relative ease.

美国水猎犬最初是作为一种全面型猎犬在美国发展起来的,训练它从小船或独木舟寻回并能相当轻松的工作。

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推荐网络例句

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石!

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻,也许正是在通往天国的路上,我体验着这白色的晕旋。

When you click Save, you save the file to the host′s hard disk or server, not to your own machine.

单击"保存"会将文件保存到主持人的硬盘或服务器上,而不是您自己的计算机上。