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常时微动测试在汶川地震甘肃灾区建筑结构震害调查中的应用 被引量:16
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作者 吴志坚 车爱兰 +2 位作者 王兰民 陈龙珠 刑爱国 《西北地震学报》 CSCD 北大核心 2009年第1期86-90,共5页
为了调查2008年5月12日汶川MS8.0大地震所造成的建筑结构震害和次生地质灾害特点并研究其破坏机理,本文开展了对甘肃灾区部分典型场地和房屋的常时微动测试与分析研究。结果表明不同震害程度房屋的常时微动测试结果与其实际破坏情况有... 为了调查2008年5月12日汶川MS8.0大地震所造成的建筑结构震害和次生地质灾害特点并研究其破坏机理,本文开展了对甘肃灾区部分典型场地和房屋的常时微动测试与分析研究。结果表明不同震害程度房屋的常时微动测试结果与其实际破坏情况有着良好的一致性。 展开更多
关键词 汶川大地震 震害考察 房屋结构 常时微动测试 甘肃灾区
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古塔结构整体性损伤检测的微动测试技术应用研究 被引量:8
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作者 范岩旻 李森曦 +1 位作者 彭冬 车爱兰 《应用力学学报》 CAS CSCD 北大核心 2016年第1期61-66,180-181,共6页
在古建筑结构保护中,无损伤或微损且便携快速的高精度检测手段以及识别结构损伤的方法一直是重要的研究课题。本文基于古塔结构的动力特性,建立了基于模态信息的古塔结构损伤识别方法,采用损伤前后结构的低阶模态信息差异进行损伤定位... 在古建筑结构保护中,无损伤或微损且便携快速的高精度检测手段以及识别结构损伤的方法一直是重要的研究课题。本文基于古塔结构的动力特性,建立了基于模态信息的古塔结构损伤识别方法,采用损伤前后结构的低阶模态信息差异进行损伤定位和损伤程度评估。首次用将该方法对典型砖木混合古塔结构——上海市松江方塔开展了研究。采用微动测试技术,获取损伤结构的动力特性参数(模态信息),采用数值方法计算获取结构未损伤模型的特征值。对测试参数及计算参数进行统一物理量的数据归一化处理后,利用结构的单元刚度矩阵作为诊断项,根据损伤表征向量进行了损伤定位及损伤程度评估。通过微动测试技术评价的结构整体损伤与以往的历史记录及测绘结果进行比较,得出结构7层、8层刚度损失最大,达到0.56,其次为第9层,达到0.78。 展开更多
关键词 古塔结构 微动测试 固有模态 整体性损伤
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微动测试技术在古建筑拱桥结构检测中的应用
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作者 范岩旻 车爱兰 +1 位作者 陈峰 曹永康 《地震工程学报》 CSCD 北大核心 2015年第2期606-611,共6页
在古桥梁建筑结构保护中,无损高精度检测一直是一个重要的研究课题。为识别古桥梁拱桥的结构损伤问题,以上海青浦迎祥桥为研究对象,采用全站仪对桥梁结构的变形进行观测及分析,评价桥梁的变形及受力状态;采用微动测试技术,获取结构的损... 在古桥梁建筑结构保护中,无损高精度检测一直是一个重要的研究课题。为识别古桥梁拱桥的结构损伤问题,以上海青浦迎祥桥为研究对象,采用全站仪对桥梁结构的变形进行观测及分析,评价桥梁的变形及受力状态;采用微动测试技术,获取结构的损伤动力特性参数,包括固有频率及振动模态。通过分析现有桥梁的模态分布,观测振动模态的突变位置确定结构损伤位置,比较结构的变形特性,对结构的损伤程度进行评价。 展开更多
关键词 古建筑拱桥 损伤识别 微动测试 固有模态
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常时微动测试在工程场地评价中的应用与发展 被引量:1
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作者 蔡彩君 《建筑技术开发》 2012年第11期24-30,共7页
结合作者主持的上海中心大厦、2010年上海世博会中国国家馆等典型工程,在对常时微动测试发展历史及现状进行综合述评的基础上,详细介绍了常时微动测试的基本原理、现场测试、信号分析等内容,论述了常时微动测试技术在工程场地评价中的... 结合作者主持的上海中心大厦、2010年上海世博会中国国家馆等典型工程,在对常时微动测试发展历史及现状进行综合述评的基础上,详细介绍了常时微动测试的基本原理、现场测试、信号分析等内容,论述了常时微动测试技术在工程场地评价中的应用与发展,可以为相关的工程技术人员提供参考。 展开更多
关键词 常时微动测试 应用与发展 场地评价
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一种在线判断气动紧急切断阀拒动现象装置的技术开发
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作者 金斌 宋健 《中文科技期刊数据库(全文版)工程技术》 2023年第7期94-97,共4页
近些年来随着石油化工行业的飞速发展,全国范围内都在不断地开展石油化工新、改、扩建项目工厂建设,并且工厂的规模以及产能逐年扩大,如何保障安全生产的压力也随之增加,本文主要介绍的是一种应用在石油化工厂中与安全生产息息相关的气... 近些年来随着石油化工行业的飞速发展,全国范围内都在不断地开展石油化工新、改、扩建项目工厂建设,并且工厂的规模以及产能逐年扩大,如何保障安全生产的压力也随之增加,本文主要介绍的是一种应用在石油化工厂中与安全生产息息相关的气动紧急切断阀上的微动测试装置,该测试装置可以有效的提前判断出需要长期保持在全开状态下的气动紧急切断阀,例如火灾切断阀、燃料气紧急切断阀等,是否存在造成严重拒动事故的故障。拒动事故的发生不但直接关系到石油化工企业的安全和稳定,同时也会涉及到产品的质量以及原辅材料消耗,所以为实现可在线确认气动紧急切断阀是否存在拒动现象,进而及早发现故障,使技术人员能够提前制定预案采取应对措施,已成为各化工企业安全生产需攻克的难点问题。 。 展开更多
关键词 石油化工 气动紧急切断阀 微动测试措施 拒动排查
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土-结构动力相互作用对上部结构反应的影响:1/4大比例钢框架模型试验研究及其数值模型验证(英文)
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作者 尚守平 熊伟 +1 位作者 王海东 周方圆 《土木工程学报》 EI CSCD 北大核心 2009年第12期25-32,共8页
为更好地了解评估土-结构动力相互作用(SSI)对上部结构的反应影响,在1/4大比例7层钢框架模型上进行一系列常时微动试验。在模型上与自由场地面安装21通道加速度传感器记录微动测试中结构水平、摇摆及弹性变形。通过不同微动输入-输出组... 为更好地了解评估土-结构动力相互作用(SSI)对上部结构的反应影响,在1/4大比例7层钢框架模型上进行一系列常时微动试验。在模型上与自由场地面安装21通道加速度传感器记录微动测试中结构水平、摇摆及弹性变形。通过不同微动输入-输出组,在频域和时域中验证并获得柔性地基,拟柔性地基及固基条件下结构传递函数及有效频率。试验结果表明结构物在微动试验情况下两主轴方向SSI效应皆为显著,主要表征周期延长(10%~22%),此显著SSI效应可归因于两正交向卓越摇摆模态。采用Veletsos等提出单自由度SSI分析模型进行参数识别并与试验数据进行比较,结果表明此模型能较好预测结构微动激励下动力反应。 展开更多
关键词 土-结构动力相互作用 微动测试 有效频率 分析模型
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Experimental Investigation on Basic Prototype of Solid Propellant Impulsive Microthrusters 被引量:1
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作者 李世鹏 张平 《Journal of Beijing Institute of Technology》 EI CAS 2000年第3期347-352,共6页
A new type of impulsive microthruster and its measurement system were designed for the aim of testing the performance of a basic prototype of solid propellant impulsive microthruster. Two sets of tests were conducted.... A new type of impulsive microthruster and its measurement system were designed for the aim of testing the performance of a basic prototype of solid propellant impulsive microthruster. Two sets of tests were conducted. The tests show that the ignitor and the main charge of the microthruster match well, the dynamic and static capability of the test and measurement meets the test requirement and the result is creditable. The measured technical characteristics of the microthruster are that the ignition delay time is shorter than 0 3?ms, the total impulse is over 3?N·s, the operational time is shorter than 16?ms and the mass ratio of the thruster is 0 216. 展开更多
关键词 solid propellant rocket motor microthruster PROTOTYPE test and measurement technique
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A Method for Eliminating the Impact of Microwave Sweeper Power Fluctuation in BOTDA System 被引量:2
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作者 Shuo Jiang Jun Chang +7 位作者 Sasa Zhang Zongliang Wang Sha Luo Boning Sun Xiaohui Liu Yongning Liu Junqiang Tian Chuanwu Jia 《Photonic Sensors》 SCIE EI CAS 2014年第1期86-91,共6页
The impact of microwave sweeper power fluctuation in the BOTDA system has been theoretically analyzed and experimentally tested. And a novel method comparing real-time acquisition of probe wave power with a new algori... The impact of microwave sweeper power fluctuation in the BOTDA system has been theoretically analyzed and experimentally tested. And a novel method comparing real-time acquisition of probe wave power with a new algorithm to realize probe wave power normalization for eliminating this impact was proposed. The principle of the proposed method was described theoretically. And the contrast test between our new method and conventional one was carried out. The experiment results indicated that the temperature accuracy was effectively improved from +5 C to 2 C. 展开更多
关键词 Distributed temperature sensor microwave sweeper power fluctuation temperature accuracy
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Unsteady Internal Flow Conditions of Mini-Centrifugal Pump with Splitter Blades 被引量:19
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作者 T. Shigemitsu J. Fukutomi +1 位作者 K. Kaji T. Wada 《Journal of Thermal Science》 SCIE EI CAS CSCD 2013年第1期86-91,共6页
Mini centrifugal pumps having a diameter smaller than lOOmm are employed in many fields. But the design method for the mini centrifugal pump is not established because the internal flow condition for these small-sized... Mini centrifugal pumps having a diameter smaller than lOOmm are employed in many fields. But the design method for the mini centrifugal pump is not established because the internal flow condition for these small-sized fluid machines is not clarified and conventional theory is not suitable for small-sized pumps. Therefore, mini cen- trifugal pumps with simple structure were investigated by this research. Splitter blades were adopted in this re- search to improve the performance and the internal flow condition of mini centrifugal pump which had large blade outlet angle. The original impeller without the splitter blades and the impeller with the splitter blades were prepared for experiment. The performance tests are conducted with these rotors in order to investigate the effect of the splitter blades on performance and internal flow condition of mini centrifugal pump. On the other hand, a three dimensional unsteady numerical flow analysis was conducted to investigate the change of the internal flow according to the rotor rotation. It is clarified from the experimental results that the performance of the mini cen- trifugal pump is improved by the splitter blades. The blade-to-blade low velocity region was suppressed in the case with the splitter blades. In addition to that, the unsteady flows near the volute casing tongue were suppressed due to the splitter blades. In the present paper, the performance of the mini centrifugal pump is shown and the un- steady flow condition is clarified with the results of the numerical flow analysis. Furthermore, the effects of the splitter blades on the performance and the unsteady internal flow condition are investigated. 展开更多
关键词 Mini-centrifugal pump Unsteady flow condition PERFORMANCE Splitter blades
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Dynamic deformation behavior of a face-centered cubic FeCoNiCrMn high-entropy alloy 被引量:13
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作者 Junyang He Qi wang +7 位作者 Husheng Zhang Lanhong Dai Toshiji Mukai Yuan Wu Xiongjun Liu Hui Wang Tai-Gang Nieh Zhaoping Lu 《Science Bulletin》 SCIE EI CSCD 2018年第6期362-368,共7页
In this study, mechanical tests were conducted oil a face-centered cubic FeCoNiCrMn high-entropy alloy, both in tension and compression, in a wide range of strain rates (10^-4-10^4 s^-1) to systematically investigat... In this study, mechanical tests were conducted oil a face-centered cubic FeCoNiCrMn high-entropy alloy, both in tension and compression, in a wide range of strain rates (10^-4-10^4 s^-1) to systematically investigate its dynamic response and underlying deformation mechanism. Materials with different grain sizes were tested to understand the effect of grain size, thus grain boundary volume, on the mechanical prop-erties. Microstructures of various samples both before and after deformation were examined using elec-tron backscatter diffraction and transmission electron microscopy. The dislocation structure as well as deformation-induced twins were analyzed and correlated with the measured mechanical properties. Plastic stability during tension of the current high-entropy alloy (HEA), in particular, at dynamic strain rates, was discussed in lights of strain-rate sensitivity and work hardening rate. It was found that, under dynamic conditions, the strength and uniform ductility increased simultaneously as a result of the mas-sive formation of deformation twins. Specifically, an ultimate tensile strength of 734 MPa and uniform elongation of-63% are obtained at 2.3×10^3 s^-1, indicating that the alloy has great potential for energy absorption upon impact loading. 展开更多
关键词 High-entropy alloys Dynamic deformation Deformation twinning Work-hardening Plastic stability
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