检索结果-南通市图书馆

ANALYSIS ON DYNAMIC CHARACTERISTICS FOR FERROMAGNETIC CONDUCTING PLATES IN A TRANSVERSE UNIFORM MAGNETIC FIELD

Acta Mechanica Solida Sinica 2000年第1期13卷 9-16页

作者： Zheng, XJ Liu, X Lanzhou Univ Dept Mech Lanzhou 730000 Peoples R China

In this paper, a set of basic equations for free vibration of ferromagnetic conducting plates in a transverse magnetic field are presented, in which the coupled effects of magnetization and eddy current on the mechanical behavior of the plate are included. Based on the quantitative analyses on the vibration frequency and the values of the critical magnetic field for several supporting conditions of the plate, the effects of the conductivity, the magnetic permeability, the thickness of the plate and supporting conditions on the vibration frequency of the plate and the critical magnetic field are discussed.

关键词： ferromagnetic conducting plate magnetoelasticity effect of eddy current vibration frequency stability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experimental and Density Functional Theory Calculational Studies on 2,3-Diaryl-tetrazole-5-thione

引用

Chinese Journal of Chemistry 2005年第5期23卷 548-556页

作者：建方方赵朴素侯玉霞卑凤利 NewMaterialsandFunctionCoordinationChemistryLaboratory QingdaoUniversityofScienceandTechnologyQingdaoShandong266042China DepartmentofChemistry HuaiyinTeacher'sCollegeHuaianJiangsu223001China//MaterialsChemistryLaboratoryNanjingUniversityofScienceandTechnologyNanjingJiangsu210094China MaterialsChemistryLaboratory NanjingUniversityofScienceandTechnologyNanjingJiangsu210094China

2,3‐Diaryl‐tetrazole‐5‐thione (diaryl=diphenyl, di( p ‐methylphenyl) and di( p ‐chlorophenyl)) has been synthesized and characterized by elemental analysis, IR and electronic absorption spectroscopy. Two of them have also been characterized by X‐ray diffraction analysis. Density functional theory calculations of the structures, charge distribution, natural bond orbital and topological analysis of the three compounds were performed at B3LYP/6‐31G* level. The calculational results are in good agreement with the X‐ray data and show that different substitute group results in different charge distribution, the exocyclic sulfur atom has the biggest negative charge value and this site is the most likely site of protonation and methylation as well as the potential coordination site with metallic ions. The predicted harmonic vibration frequencies were compared with the experimental values. On the basis of vibrational analyses, the thermodynamic properties of these compounds at different temperatures were calculated, which reveal that , and temperatures have good linear correlations. The calculations of second order optical nonlinearity have also been carried out and relatively high molecular hyperpolarizability values of 1.0913×10 ‐29 ‐1.6518×10 ‐29 esu were predicted.

关键词： synthesis crystal structure density functional theory vibration frequency second order optical nonlinearity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

On frequency Sensitivity and Mode Orthogonality of Flexible Robotic Manipulators

引用

IEEE/CAA Journal of Automatica Sinica 2016年第4期3卷 394-397页

作者： Fei-Yue Wang Yanqing Gao IEEE State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of Sciences Research Center of Computational Experiments and Parallel Systems the National University of Defense Technology Department of Manufacturing & Mechanical Engineering & Technology Oregon Institute of Technology

This paper presents sensitivity analysis of vibration frequencies of flexible manipulators with respect to variations of systems parameters such as rotational inertia of hub,and mass,moment,and side of tip *** Euler-Bernoulli and Timoshenko dynamical models of flexible manipulators are *** using variational method,sensitivity indices are obtained with explicit expressions for measuring the sensitivity of *** on variational formulations,a novel method for deriving the orthogonal relations among vibration modal shape functions of flexible manipulators is *** this method,the orthogonal relations can be derived easily without invoking the tedious process of differentiation and integration by part,as commonly used in their derivation.

关键词： Flexible manipulators Euler-Bernoulli dynamical model Timoshenko dynamical model variational formulation vibration frequency frequency sensitivity sensitivity analysis mode orthogonality

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Exploring the Efficiency of Experimental Construction of Sorting Ginned Cotton Seed Machine

引用

Engineering（科研） 2021年第1期13卷 18-29页

作者： Avazbek Оbidov Muhiddin Vokhidov Jahongir Abdurahmonov Namangan Institute of Engineering and Technology Namangan Uzbekistan

In this paper, research has been conducted to increase the quantity of fiber produced in the enterprise by creating a sorting device for spun seeds, dividing them into fractions by geometric dimensions, and by re-ginning, separating those with long fibers. A new model was developed for geometric sorting of cotton seeds in the harvest, and experiments determined its effectiveness and the optimal values of the factors affecting the efficiency using mathematical modeling. Based on the results of the study, graphs of the influence of factors on device performance and on device efficiency were constructed.

关键词： Cotton Seeds Cotton Fiber Fractions Sorting Machine Short Fiber Air Flow vibration Machine vibration frequency

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Safety Assessment of Liquid Launch Vehicle Structures Based on Interpretable Belief Rule Base

引用

Computer Systems Science & Engineering 2023年第10期47卷 273-298页

作者： Gang Xiang Xiaoyu Cheng Wei He Peng Han Beihang University School of Automation Science and Electrical Engineering Beijing100083China Beijing Aerospace Automatic Control Institute Beijing100070China School of Computer Science and Information Engineering Harbin Normal UniversityHarbin150025China Rocket Force University of Engineering Xi’an710025China

A liquid launch vehicle is an important carrier in aviation,and its regular operation is essential to maintain space *** the safety assessment of fluid launch vehicle body structure,it is necessary to ensure that the assessmentmodel can learn self-response rules from various uncertain data and not differently to provide a traceable and interpretable assessment ***,a belief rule base with interpretability(BRB-i)assessment method of liquid launch vehicle structure safety status combines data and ***,an innovative whale optimization algorithm with interpretable constraints is *** experiments are carried out based on the liquid launch vehicle safety experiment platform,and the information on the safety status of the liquid launch vehicle is obtained by monitoring the detection indicators under the simulation *** MSEs of the proposed model are 3.8000e-03,1.3000e-03,2.1000e-03,and 1.8936e-04 for 25%,45%,65%,and 84%of the training samples,*** can be seen that the proposed model also shows a better ability to handle small sample ***,the belief distribution of the BRB-i model output has a high fitting trend with the belief distribution of the expert knowledge settings,which indicates the interpretability of the BRB-i *** results show that,compared with other methods,the BRB-i model guarantees the model’s interpretability and the high precision of experimental results.

关键词： Liquid launch vehicle belief rule base with interpretability belief rule base whale optimization algorithm vibration frequency swaying angle

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：