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The influence of hand hole on the ultimate strength and crack pattern of shield tunnel segment joints by scaled model test

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Frontiers of Structural and Civil Engineering 2019年第5期13卷 1200-1213页

作者： shaochun wang Xi JIANG Yun BAI Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China

With the shield tunnel going deeper and deeper, the circumferential axial force becomes the governing factor rather than the bending moment. The hand hole acts as a weak point and initial damage in the segment joint especially when the circumferential axial force is extremely high. Despite the wide application of steel fiber or synthetic fiber in t|ie tunneling, limited researches focus on the structural responses of segment joint with macro structural synthetic fiber (MSSF). In this paper, a 1:2 reduced-scale experiment was conducted to study the structural perfonnance of the segment joint with different types of hand holes under ultra-high axial force. Special attention is paid to failure mode and structural performance (bearing capacity, deformation, cracking, and toughness). Moreover, segment joints with MSSF are also tested to evaluate the effects of MSSF on the failure mode and structural performance of the segment joints. The experiment results show that the hand hole becomes the weakest point of the segment joint under ultra-high axial force. A\/-type crack pattern is always observed before the final failure of the segment joints. Different types and sizes of the hand hole have different degree of influences on the structural behavior of segment joints. The segment joint with MSSF shows higher ultimate bearing capacity and toughness compared to segment joint with common concrete. Besides, the MSSF improves the initial cracking load and anti-spallling resistance of the segment joint.

关键词： shield tunneling structural synthetic fiber concrete hand hole segment joint ultimate bearing capacity crack pattern

Joint system consumption minimization and workload allocation in edge-core network

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The Journal of China Universities of Posts and Telecommunications 2018年第3期25卷 45-54页

作者： wang shaochun Lu Zhaoming Wen Xiangming wang Luhan Ma Lu Beijing Laboratory of Advanced Information Networks Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

The explosive increase of smart devices and mobile traffic results intolerable network latency and degraded service to the end-users. in heavy burden on backhaul and core network, As a complement to core network, edge network contributes to relieving network burden and improving user experience. To investigate the problem of optimizing the total consumption in an edge-core network, the system consumption minimization problem is fromulated, considering the energy consumption and delay. Given that the formulated problem is a mixed nonlinear integer programming （MNIP） , a low-complexity workload allocation algorithm is proposed based on interior-point method. The proposed algorithm has an extremely short running time in practice. Finally, simulation results show that edge network can significantly complement core network with much reduced backhaul energy consumption and delay.

关键词： edge network core network system consumption optimization workload allocation

A WT-STFT combining Algorithm

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International Journal of Minerals,Metallurgy and Materials 2000年第4期14卷 315-317页

作者： Xisheng Li, shaochun wang (Information Engineering School, University of Science and Technology Beijing, Beijing 100083, China) Information Engineering School University of Science and Technology Beijing Beijing 100083 China

A fast wavelet packet (WP) algorithm is presented, in which the wavelet transform (WT) and the short-time Fourier transform (STFT) are combined. As WT produces multiresolution of frequency and time, and STFT has a fas... 详细信息

关键词： signal processing, wavelet transform short-time Fourier transform Informatid

Improvement of Boxcar Integrator and Its Application to Low Resistance Measurement of Inductive Load Coil

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International Journal of Minerals,Metallurgy and Materials 1998年第3期12卷 180-184页

作者： Xisheng Li shaochun wang(Information Engineering School, University of Science and Technology Beijing, Beijing 100083, China) Information Engineering School University of Science and Technology Beijing Beijing 100083 China

A boxcar integrator is described which is suitable for the low-repetition-rate signal processing. This boxcar integrator, named fixed-interval mode boxcar integrator, is able to reject harmonics other than the first harmonic component. It can also decrease the effective time constant In many situations, the antialiasing filter with narrow bandwidth will cause distortion of the input signal. The fixed-interval mode boxcar integrator with suitable gate width can achieve relative high performance without signal distortion because the bandwidth of its antialiasing filter can be wider than that in the fixed-Point boxcar integrator. ms boxcar integrator is used as majn part of signalprocessing circult in the low resisance measurement of inductive load coil. The results of experiments show that the fixed-interval boxcar integrator is suitable for low-repetition-rate use.

关键词： signal processing resistance measurement boxcar integrator

CHARACTERISTICSANDEVALUATIONOFDENSITYFLOWRESERVOIRSINDONGYINGFORMATIONOFBEIPUAREA,EASTERNHEBEIOFCHINA

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Scientia Geologica Sinica 1998年第3期 80-87页

作者： Yang shaochun and wang Zhixin University of Petroleum, Dongying 257062

１．ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｇｅｎｅｒａｌ，ｄｅｎｓｉｔｙｆｌｏｗｒｅｓｅｒｖｏｉｒｓｈａｖｅｌｏｗｐｅｒｍｅａｂｉｌｉｔｙｃｈａｒａｃｔｅｒｉｓｔｉｃｓ．Ｔｈｅｒｅｆｏｒｅ，ｓｔｕｄｙｉｎｇｔｈｅｉｒｍｉｃｒｏ...

１．ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｇｅｎｅｒａｌ，ｄｅｎｓｉｔｙｆｌｏｗｒｅｓｅｒｖｏｉｒｓｈａｖｅｌｏｗｐｅｒｍｅａｂｉｌｉｔｙｃｈａｒａｃｔｅｒｉｓｔｉｃｓ．Ｔｈｅｒｅｆｏｒｅ，ｓｔｕｄｙｉｎｇｔｈｅｉｒｍｉｃｒｏｃｈａｒａｃｔｅｒｉｓｔｉｃｓ，...

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The Role of Echocardiography in Hypertrophic Cardiomyopathy

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Cardiovascular Innovations and Applications 2017年第B02期2卷 279-286页

作者： Jing Ping Sun Xing Sheng Yang shaochun wang Division of Cardiology Chinese University of Hong KongSha TinHong Kong Affiliated Hospital of Jining Medical University JiningChina

Hypertrophic cardiomyopathy(HCM)is a common genetic cardiovascular disease and appears in all ethnic *** is diagnosed on the basis of left ventricular *** is a key technique in the diagnosis of HCM,the prognosis of patients with HCM,the management strategy for HCM,and the follow-up of patients with *** review briefly describes and discusses the practical use of established echocardiography techniques and the current and emerging echocardiographic methods that can help physicians in the correct diagnostic and pathophysiological assessment of patients with HCM.

关键词： Hypertrophic cardiomyopathy Hypertension Echocardiography

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基于风险管理的整体钢平台变形预警指标研究

中国安全科学学报 2021年第6期31卷 56-63页

作者：沈阳徐磊王少纯上海建工一建集团有限公司上海200120

超高层建筑施工过程中整体钢平台装备易发生失稳破坏,为解决其安全风险预警难题,采用最不利条件下结构变形作为评估整体钢平台安全风险特性的核心指标,提出变形预警指标的确定方法。首先,基于整体钢平台装备构成的系统分析,针对正常状... 详细信息

超高层建筑施工过程中整体钢平台装备易发生失稳破坏,为解决其安全风险预警难题,采用最不利条件下结构变形作为评估整体钢平台安全风险特性的核心指标,提出变形预警指标的确定方法。首先,基于整体钢平台装备构成的系统分析,针对正常状态和极限状态分析装备失效模式,提出失效风险等级的划分方法;然后,结合整体钢平台结构变形发展特性,建立基于风险管理的四级变形预警指标确定方法;最后,选择整体钢平台实际工程开展案例分析。结果表明:通过确定风险等级标准和风险值,可获取钢平台装备模型建立条件,进而确定变形预警指标。该方法可在分析失效路径与失效模式的基础上,通过有限元模型计算获得四级变形预警指标值,该方法具备一定的科学性和可行性。

关键词：风险管理整体钢平台变形预警指标超高层建筑装备结构失效

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三相异步电动机定子绕组温度在线监测

北京科技大学学报 1999年第3期21卷 294-297页

作者：张惠浩王绍纯北京科技大学信息工程学院北京100083

基于过程辨识理论，依据三相异步电动机在αβ坐标系下的数学模型，建立了定于绕组温度预测的数学模型，并以80C552单片机为核心构成三相异步电动机定子绕组温度在线监测硬件与软件系统，通过实验验证了此方法的正确性与可行性．

关键词：定子绕组在线监测三相异步电机温度监测

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行星轮式月球车移动系统的关键技术

机械工程学报 2005年第12期41卷 156-161页

作者：高海波邓宗全胡明王少纯哈尔滨工业大学机电工程学院哈尔滨150001

为提高月球车的越障能力,重点考虑提高车轮的越障能力,成功研制了一种采用扭杆弹簧和磁弹簧减振器并联悬架,且每个行星车轮独立驱动的月球车。在行星车轮不翻转越障条件下,推导了月球车两个前行星车轮同时越障时可以爬过的垂直障碍高... 详细信息

为提高月球车的越障能力,重点考虑提高车轮的越障能力,成功研制了一种采用扭杆弹簧和磁弹簧减振器并联悬架,且每个行星车轮独立驱动的月球车。在行星车轮不翻转越障条件下,推导了月球车两个前行星车轮同时越障时可以爬过的垂直障碍高度与车辆参数的关系,并进行了ADAMS仿真。对行星轮式月球车进行了动力学分析,确定了行星车轮的等效地面不平度函数,并在此基础上建立了7自由度月球车振动系统模型,根据模型的计算结果确定了扭杆弹簧刚度和减振器阻尼的最佳参数范围。同时,进行了月球车爬坡试验和垂直越障能力试验研究,还模拟月球的低重力环境进行了整车的低重力试验。

关键词：月球车越障能力动力学分析