检索结果-南通市图书馆

Leakage and wear characteristics of carbon seals for aero-engines

Chinese Journal of Aeronautics 2022年第11期35卷 389-400页

作者： Guoqing LI Shen ZHANG Zhong KANG Yanfeng ZHANG Xingen LU Junqiang ZHU Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China School of Aeronautics and Astronautics University of Chinese Academy of SciencesBeijing 100190China School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBejing 102206China

Experimental investigation has been performed to study the leakage and wear characteristics of carbon seal working at high circumferential speed. To expand the scope of application, two newly designed carbon seals were compared: #1 Carbon Seal(CS1) with the inner diameter of136 mm and including 4 segments, #2 Carbon Seal(CS2) with the inner diameter of 212 mm and including 6 segments. Air leakage tests were firstly conducted in the Medium-speed Seal test Rig. The pressure ratio changed from 1.04 to 2.02 with the rotating speed varying from 0 to18300 r/min. Of paramount concern was the durability test, including 300 h running time accumulated by three different working conditions, which was separately implemented on each carbon *** morphology variation of the friction surface, wear and leakage were recorded. Results indicated that the leakage monotonously increases with the pressure ratio and decreases with the rotating speed. Comparing with CS1, more typical features exist on the friction surface of CS2, which are generated by more severe wear. Continually, leakage characteristics deteriorate. Furthermore, fitted formula has been educed for the life prediction of carbon seal, which could provide some supports for aero-engine design.

关键词： Aero-engine Carbon seal durability test Leakage Rotating Wear

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

基于六自由度轴耦合道路模拟试验机的悬架耐久试验研究

引用

建模与仿真 2022年第5期11卷 1293-1300页

作者：王勇哲杨光詹永骁崔学鹏中汽研汽车检验中心(天津)有限公司，天津

本文基于六自由度轴耦合道路模拟试验机对悬架耐久试验的多种工况进行研究，重点分析了悬架在垂向回弹工况中无法直接进行垂向载荷迭代的原因，提出了将台架垂向位移作为目标信号进行迭代以实现模拟垂向回弹工况的方法。

关键词：悬架系统道路模拟迭代耐久测试 Suspension Road Simulate Iteration durability test

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Experimental investigation on freeze-thaw durability of polymer concrete

引用

Frontiers of Structural and Civil Engineering 2021年第4期15卷 1038-1046页

作者： Khashayar JAFARI Fatemeh HEIDARNEZHAD Omid MOAMMER Majid JARRAH Department of Civil and Environmental Engineering Pennsylvania State UniversityUniversity ParkPA16802USA Department of Civil Engineering Sharif University of TechnologyTehranIran Department of Civil and Environmental Engineering Washington State UniversityPullmanWA99164USA

Assessing the durability of concrete is of prime importance to provide an adequate service life and reduce the repairing cost of ***-thaw is one such test that indicates the ability of concrete to last a long time without a significant loss in its *** this study,the freeze-thaw resistance of polymer concrete containing different polymer contents was explored and compared to various conventional cement ***’fresh and hardened properties were assessed for their workability,air content,and compressive *** mass loss,length change,dynamic modulus of elasticity,and residual compressive strength were determined for all types of concretes subjected to freeze-thaw cycles according to ASTM C666-procedure *** showed that polymer concrete(PC)specimens prepared with higher dosages of polymer contents possessed better freeze-thaw durability compared to other *** high durability performance of PCs is mainly due to their impermeable microstructures,absence of water in their structure,and the high bond strength between aggregates and a polymer *** is also indicated that the performance of high-strength concrete containing air-entraining admixture is comparable with PC having optimum polymer content in terms of residual compressive strength,dynamic modulus of elasticity,mass loss,and length change.

关键词： durability test freeze-thaw resistance polymer concrete residual compressive strength ASTM C666-15

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

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

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

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：