检索结果-南通市图书馆

damping performance and martensitic transformation of rapidly solidified Fe-17%Mn alloy

Journal of Materials Science & Technology 2022年第22期117卷 1-7页

作者： Na Yan Delu Geng Bingbo Wei School of Physical Science and Technology Northwestern Polytechnical UniversityXi’an 710072China

The rapid solidification of Fe-17%Mn alloy was performed to investigate the influence of cooling rate on its damping performance and martensitic transformation mechanism. A proper heat treatment was also carried out to clarify its coupled effects with rapid solidification. The stacking fault probability and martensitic transformation temperature were determined to demonstrate their relationship with the cooling rate and the heat treatment process. With the increase of cooling rate, the volume fraction of ε-martensite increased and the stacking fault probability of ε-martensite was enhanced. The formation ofε-martensite phase was remarkable for the increase of damping capacity and microhardness. It was found that rapid solidification was beneficial for the formation of ε-martensite and the improvement of damping capacity. This effect can be facilitated by the incorporation of the heat treatment process.

关键词： damping performance Rapid solidification Martensitic transformation Stacking fault probability

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

Fine-Grained Bulk NiTi Shape Memory Alloy Fabricated by Rapid Solidifcation Process and Its Mechanical Properties and damping performance

引用

Journal of Materials Science & Technology 2013年第9期29卷 855-862页

作者： Hongjie Jiang Shanshan Cao Changbo Ke Xiao Ma Xinping Zhang School of Materials Science and Engineering South China University of Technology

A near-equiatomic NiTi shape memory alloy was fabricated by rapid solidification process through vacuum arc melting followed by vacuum suction casting in water-cooled thick copper mold. The rapidly solidified （or suction cast） NiTi alloy shows much finer grains and homogenous microstructure, in particular a uniform distribution of various fine precipitates, compared to the conventional cast one. The resultant alloy also exhibits the homogenous Ni distribution in the matrix of the alloy, allowing the martensitic transformation to take place throughout the NiTi alloy matrix simultaneously and resulting in sharper transformation peaks compared to the conventional cast alloy. Moreover, the suction cast NiTJ alloy shows a significant improvement over the conventional cast one, in terms of possessing higher deformation recovery rates and displaying the increased compressive strength and damping capacity by 4% and 20%, respectively.

关键词： NiTi shape memory alloy Rapid solidification Mierostructure Mechanical property damping performance

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

Connection Between damping Torque Analysis and Energy Flow Analysis in damping performance Evaluation for Electromechanical Oscillations in Power Systems

引用

Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 19-28页

作者： Yong Hu Siqi Bu Xin Zhang Chi Yung Chung Hui Cai Department of Electrical Engineering and Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHong KongChina Shenzhen Research Institute The Hong Kong Polytechnic UniversityShenzhenChina Centre for Energy Systems and Strategy Cranfield UniversityCranfieldUK Department of Electrical and Computer Engineering University of SaskatchewanSaskatoonCanada State Grid Jiangsu Economic Research Institute NanjingChina

The damping performance evaluation for electromechanical oscillations in power systems is crucial for the stable operation of modern power *** this paper,the connection between two commonly-used damping performance evaluation methods,i.e.,the damping torque analysis(DTA)and energy flow analysis(EFA),are systematically examined and revealed for the better understanding of the oscillatory damping ***,a concept of the aggregated damping torque coefficient is proposed and derived based on DTA of multi-machine power systems,which can characterize the integration effect of the damping contribution from the whole power ***,the pre-processing of measurements at the terminal of a local generator is conducted for EFA,and a concept of the frequency-decomposed energy attenuation coefficient is defined to screen the damping contribution with respect to the interested *** this basis,the frequency spectrum analysis of the energy attenuation coefficient is employed to rigorously prove that the results of DTA and EFA are essentially equivalent,which is valid for arbitrary types of synchronous generator models in multi-machine power ***,the consistency between the aggregated damping torque coefficient and frequency-decomposed energy attenuation coefficient is further verified by the numerical calculation in case *** relationship between the proposed coefficients and the eigenvalue(or damping ratio)is finally revealed,which consolidates the application of the proposed concepts in the damping performance evaluation.

关键词： Electromechanical oscillation damping performance damping torque analysis(DTA) energy flow analysis(EFA) frequency spectrum

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

Dynamical mechanical behaviors of rubber-filled wood fiber composites with urea formaldehyde resin

引用

Journal of Bioresources and Bioproducts 2022年第4期7卷 320-327页

作者： Feiyu Tian Xinwu Xu College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China

Wood composites glued with thermosetting synthetic resins tend to show inadequate damping performance caused by the cured resinous *** rubber maintains prominent elasticity and is feasible to be an optional *** that end,composite panels of granulated tire rub-ber(GTR)powders and thermal-mechanically pulped wood fibers were fabricated in this *** formaldehyde(UF)resin was applied as the bonding agent(10%based on wood/rubber total weight).Dynamical mechanical analysis(DMA)was conducted to disclose the thermo-mechanical behaviors of the rubber-filled wood fiber *** of two technical pa-rameters,i.e.,GTR powder size(0.55-1.09 mm)and addition content(10%,20%and 30%based on wood/rubber total weight),was specifically *** results showed that storage modu-lus(E’)of the rubber-filled composite decreased while loss factor(tan𝛿)increased monotonously along with elevated temperature.A steady“plateau”region among 110-170°C was found where both E’and tan𝛿keep ***,tan𝛿showed two peak values at 103-108 and 231-233°C due to glass transition of lignin and thermal degradation of hemicellulose,*** of rubber fillers resulted in lower bending and internal bonding strengths as well as stor-age modulus *** the temperature was above 183°C,all the rubber-filled composites showed higher tan𝛿values than the *** findings above fully demonstrate the improved damping performance of the UF-bonded wood fiber composites on account of rubber *** work is still needed to optimize the rubber/fiber interfacial bonding strength.

关键词： damping performance Wood composite Recycled tire rubber Dynamical mechanical analysis Loss factor

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

Characterization for the Dynamics of an Adjustable Linear Oil Damper for Advanced Rail Vehicles

Characterization for the Dynamics of an Adjustable Linear Oi...

引用

第十一届IFTOMM世界大会

作者： Wenlin Wang Peien Feng State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

＜正＞A parametric model for the dynamics of an adjustable linear oil damper equipped in advanced rail vehicles is developed in this paper. Instantaneous leakage flows, oil compressibility, oil temperature and valve dynamics etc. are taken into account in the modelling process. A computer package based on the model is developed in MATLAB environment and numerical analyses are carried out on the damping performance by means of parameters identification. Experiments with a CAT rig are done at last and satisfied agreement is achieved between the numerical prediction and experiments.

关键词： Modeling Dynamics Adjustable linear oil damper Orifice damping performance Parameter identification

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

端环氧基丁腈橡胶插层蒙脱土纳米复合材料的制备与表征

端环氧基丁腈橡胶插层蒙脱土纳米复合材料的制备与表征

引用

2014年全国高分子材料科学与工程研讨会

作者：黄强邹华维梁梅陈洋高分子材料工程国家重点实验室四川大学高分子研究所

高分子阻尼材料由于其高阻尼性能而逐渐成为阻尼材料的研究方向和发展趋势。环氧树脂具有优异的力学强度、化学稳定性和电绝缘性,因而在机械、运输和航空航天等方面等到广泛的应用,一般可作为复合材料的基体。而由于其本身存在的阻尼温... 详细信息

高分子阻尼材料由于其高阻尼性能而逐渐成为阻尼材料的研究方向和发展趋势。环氧树脂具有优异的力学强度、化学稳定性和电绝缘性,因而在机械、运输和航空航天等方面等到广泛的应用,一般可作为复合材料的基体。而由于其本身存在的阻尼温域窄、质脆、抗冲击性能差和开裂应变低等限制了它的应用,因而对环氧树脂的阻尼改性受到了国内外的研究。复合阻尼结构的基本类型有自由阻尼和约束阻尼,约束阻尼材料由于振动时发生剪切变形,

关键词： intercalation epoxy OMMT damping performance

来源： cnki会议评论

在线全文

cnki会议

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

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

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：