实验模态分析 meaning in English
experimental modal analysis
Examples
- Experimental modal analysis based on ambient vibration is mainly to deal with the engineering problems from with we can hardly achieve the input signals , such as the operational modes of a flight vehicle during the flight or the dynamic behavior of a large - scale structure like an offshore platform , a bridge as well as a skyscraper on which we can ’ t exert a heavy kick
基于环境振动的实验模态分析主要针对一些激励不可测的工程问题,如研究飞行器在飞行中的运行模态,或诸如海洋平台、桥梁、摩天大楼之类难以施加激励的大型结构的动态特性。本文重点研究了随机子空间方法在环境振动模态分析领域的应用。 - Secondly , two carbon fiber reinforced composite beams were fabricated , and their modal frequencies were measured by an experiment method . thirdly , delaminations were modeled by pairs of nodes with the same coordinates but different node numbers , while the modal frequencies of these beams with different delamination location and size were computed by an eas piezoelectric solid element . moreover , a novel method combining computational mechanics and neural network was demonstrated for composite health monitoring ; the first five flexure modal frequencies obtained by fem were modified by a primary revising approach and were used to train the neural network
本文较全面地评述了神经网络的应用模型、改进算法等，编制了bp神经网络程序：制备了纤维增强复合材料试件，并进行实验模态分析；利用坐标相同、节点号不同的方法模拟脱层损伤，基于eas列式的压电固体单元计算了不同脱层损伤情况下的频率信息；针对基于实验数据训练神经网络存在样本不足的缺陷，本文提出了利用有限元方法对含有脱层损伤的复合材料试件进行数值模拟，以前五阶弯曲模态频率构建训练样本的新思路，并提出了一种初步的计算值修正方法，以此构建神经网络的训练样本：将实验模态分析的结果送入训练好的神经网络进行预测，实现了对复合材料梁的脱层损伤的定位和损伤程度的评估。 - To meet this challenge , a research project was supported by ministry of communication and bv shanghai zhenhua port machinery co . . ltd . focusing on analysis of tdtcd ( traditional design theories of crane drums ) the paper has studied the impacts of features under the binding force of wire ropes , the end - plate and rope slot . this study is based not only on the thin shell theory and viscoelastic mechanics to calculate the strength and stability of drum , but also on an experiment with technology in " state of act "
本文结合交通部重点科技项目“港口起重机钢丝绳传动件高性能技术研究”和上海振华港机股份有限公司委托项目“起重机焊接卷筒极限壁厚研究” ，针对起重机卷筒传统设计方法偏于保守的情况，以薄壳理论和近代力学为基础，以现代试验技术为研究手段，对钢丝绳紧箍力作用下的外载特性、端板、绳槽等因素对卷筒强度和稳定性的影响进行了系统的理论研究，在深入开展卷筒强度、稳定性和实验模态分析等试验的基础上，提出了有别于传统方法的卷筒强度、稳定性计算方法。 - The aim of this paper is to relate structural inherent characteristic with exterior excitation , to wield experimental mode analysis technique and structure intension theory in order to separate structural leading mode under practical work state on base of spectrum analysis of exterior excitation and identification each rank mode parameter of structure . sequentially , the issue of space complex stress state in effect of static and dynamic coupling transforms into the issue of simple stress state ( under mode form ) in reciprocal effect of each rank mode in order to analyze structural dynamical intensity
将结构本身的固有特性和外部激励联系在一起，运用实验模态分析技术和结构强度理论，在对外部激励进行谱分析和识别出结构各阶模态参数的基础上，分离出实际工作状态下结构的主导模态，从而将一静动耦合力作用下的空间复杂应力状态问题转化为各阶模态相互作用下的简单应力状态(模态形态下)问题进行结构动强度分析。 - The vibration problems in pumped storage hydroplant are outstanding , due to their high - velocity flow , high - speed units , etc . on the base of summarizing the development of inverse analysis methods , this paper proposed a dynamic inverse model for underground hydroplant was built , combining the modal analysis and inverse numerical computation
点，提出采用实验模态分析与动力反演分析相结合，以试验模态与计算模态某种偏差为目标函数，建立通用的结构最优化动力反分析模型。引入改进的遗传算法，实现了其与ansys软件的接口。