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Fiber Grating-Based Strain Sensor Array for Health Monitoring of Pipelines 基于光纤光栅的管道健康监测应变传感器阵列
Q2 Engineering Pub Date : 2019-01-01 DOI: 10.32604/sdhm.2019.05139
Hui Wang, Songyou Li, L. Liang, Gang Xu, Bin Tu
: Pipelines are one of the most important modern energy transportation methods, used especially for the transportation of certain dangerous energy media materials such as crude oil, natural gas, and chemical raw materials. New requirements have been put forward for the health monitoring and early security warning of pipelines because of the large-scale and complicated development trend of the pipe network system. To achieve an accurate assessment of the health conditions of pipeline infrastructure, obtaining as many precise operating parameters as possible, particularly at some critical parts of the pipeline, is necessary. Therefore, a novel type of fi ber grating strain sensor array is proposed herein to monitor the pipeline hoop strain. The sensor utilizes fi ber grating characteristics such as light weight, corrosion resistance, remote transmission, and strong environmental adaptability. The fi ber containing the grating measurement points is implanted into the composite material to complete the sensitization encapsulation and protection of the bare fi ber grating. The design of the sensor array ful fi lls the requirements for monitoring pipeline mass data, making it easy to form a pipeline health monitoring sensor network. The sensor sensitivity is researched by using a com-bination of theoretical and experimental analysis. A sensitivity test, as well as linearity and stability tests, are performed on the sensor. The experimental results show that the average sensitivity of the sensor is 14.86 pm /µ ε , and the error from the theoretical calculation analysis value is 8.75%. Due to its high reliability, good linear response and long-term stability, and the ability to re fl ect the exact strain change of the outer wall of the pipeline, the designed sensor can support long-term online pipeline monitoring. The fi ber grating sensor array network has successfully realized the monitoring of the pipeline ’ s internal operation by using external strain changes. In addition to the performance bene fi ts, there are other merits associated with the applicability of the sensor namely simple structure, compact size, manufacturing ease, and exterior installation ease.
管道是现代能源运输的重要方式之一,尤其用于原油、天然气、化工原料等某些危险的能源介质材料的运输。由于管网系统的大型化、复杂化的发展趋势,对管道的健康监测和安全预警提出了新的要求。为了准确评估管道基础设施的健康状况,有必要获得尽可能多的精确运行参数,特别是在管道的一些关键部分。为此,本文提出了一种新型的光纤光栅应变传感器阵列来监测管道环箍应变。该传感器利用光纤光栅的重量轻、耐腐蚀、远程传输、环境适应性强等特点。将含有光栅测点的光纤植入复合材料中,完成裸光纤光栅的敏化封装和保护。该传感器阵列的设计完全满足了对管道海量数据监测的要求,便于形成管道健康监测传感器网络。采用理论分析和实验分析相结合的方法对传感器的灵敏度进行了研究。对传感器进行了灵敏度测试、线性度和稳定性测试。实验结果表明,该传感器的平均灵敏度为14.86 pm /µε,与理论计算分析值的误差为8.75%。该传感器具有高可靠性、良好的线性响应和长期稳定性,能够准确反映管道外壁应变变化,可支持管道长期在线监测。光纤光栅传感器阵列网络成功地实现了利用外部应变变化对管道内部运行的监测。除了性能优势外,该传感器的适用性还有其他优点,即结构简单、尺寸紧凑、制造方便和外部安装方便。
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引用次数: 2
Mechanical Behaviors and Deformation Properties of Retaining Wall Formed by Grouting Mould-Bag Pile 注浆模袋桩挡土墙的力学性能及变形特性
Q2 Engineering Pub Date : 2019-01-01 DOI: 10.32604/sdhm.2019.06058
Shengcai Li, Jun Tang, Lin Guo
The simplified mechanical model and finite element model are established on the basis of the measured results and analysis of the grouting pile deformation monitoring, surface horizontal displacement and vertical displacement monitoring, deep horizontal displacement (inclinometer) monitoring, soil pressure monitoring and seepage pressure monitoring in the lower reaches of Wuan River regulation project in Shishi, Fujian Province. The mechanical behavior and deformation performance of mould-bag pile retaining wall formed after controlled cement grouting in the silty stratum of the test section are analyzed and compared. The results show that the use of controlled cement grouting mould-bag pile technology is to strengthen the soft stratum for sealing water and reinforcement, so that it can rock into a retaining wall, which can both retain soil and seal water with excellent effect. The control of cement grouting technology not only makes the soft soil rock in the range of retaining wall of mould-bag pile, but also makes a wide range of soil around the mould-bag pile squeeze and embed to compaction; and its cohesion and internal friction angle increased, so as to achieve the purpose of reducing soil pressure and improving mechanical and deformation properties of retaining wall.
根据福建省石市武安河下游治理工程注浆桩变形监测、地表水平位移和垂直位移监测、深层水平位移(测斜仪)监测、土压力监测和渗流压力监测的实测结果和分析,建立了简化力学模型和有限元模型。对试验段粉质地层中控制水泥灌浆后形成的模袋桩挡土墙的力学性能和变形性能进行了分析比较。结果表明:采用控制水泥灌浆模袋桩技术对软地层进行加固止水加固,使其岩成挡土墙,既保土又止水,效果优异。水泥灌浆技术的控制不仅使模袋桩挡土墙范围内的软土岩石,而且使模袋桩周围大范围的土体被挤嵌压实;其黏聚力和内摩擦角增大,从而达到减小土压力,改善挡土墙力学变形性能的目的。
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引用次数: 2
Ensemble Recurrent Neural Network-Based Residual Useful Life Prognostics of Aircraft Engines 基于集成递归神经网络的飞机发动机剩余使用寿命预测
Q2 Engineering Pub Date : 2019-01-01 DOI: 10.32604/sdhm.2019.05571
Jun Wu, Kui Hu, Yiwei Cheng, Ji Wang, C. Deng, Yuanhang Wang
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引用次数: 3
Load Test and Fatigue Life Evaluation for Welded Details in Taizhou Yangtze River Bridge 台州长江大桥焊接细部荷载试验及疲劳寿命评价
Q2 Engineering Pub Date : 2019-01-01 DOI: 10.32604/sdhm.2019.04654
M. Zhuang, C. Miao, R. Chen
To study the fatigue performance of welded details in the orthotropic steel decks, the steel box girder for Taizhou Yangtze River Bridge is taken as the research object. Based on the field monitoring data obtained from the load test, the stress response test of the orthotropic steel box girder under wheel loads is performed and the correctness of the vehicle test data obtained from the field monitoring data also have been verified by the numerical results of the finite element model. Based on the Miner linear cumulative damage theory, the S-N curve of the Eurocode3 specification is referenced, and the fatigue life calculation formula of the welded details is determined according to the actual structural features. The fatigue life evaluation of the four typical welded details is obtained. The results indicate that: The load test data is compared and verified by the numerical result of finite element model. The local effect of stress distribution is remarkable. The stress measurement points on the four typical welded details are mainly based on low amplitude stress cycles. Most of the stress ranges are 2-10 MPa, among which the stress range of the welded details at the U-rib butt joint is larger. The fatigue life of welded details in the 14 mm thick top plate is smaller than that of the 16 mm thick top plate corresponding to the fatigue life of the welded details. The rib-to-rib butt welded joints and the openings of the diaphragms were prone to fatigue failure. Among them, the welding details of the 14 mm thick U-rib butt joints first appeared fatigue failure. The arrangement of the diaphragm can effectively increase the fatigue life of the top-U rib weld and improve the fatigue performance at this detail.
为研究正交异性钢桥面焊接细部的疲劳性能,以泰州长江大桥钢箱梁为研究对象。在荷载试验现场监测数据的基础上,进行了轮载作用下正交异性钢箱梁的应力响应试验,并通过有限元模型的数值结果验证了现场监测数据得到的整车试验数据的正确性。在Miner线性累积损伤理论的基础上,参考了欧洲规范3的S-N曲线,根据实际结构特点确定了焊接细部的疲劳寿命计算公式。得到了4种典型焊接细部的疲劳寿命评价。结果表明:荷载试验数据与有限元模型的数值结果进行了比较和验证。应力分布的局部效应显著。四个典型焊接细部的应力测点主要基于低幅应力循环。应力范围大都在2 ~ 10 MPa之间,其中u型肋对接处的焊接细部应力范围较大。14mm厚顶板中焊接细部的疲劳寿命小于对应于焊接细部疲劳寿命的16mm厚顶板。肋对肋对接焊接接头和隔板开口容易发生疲劳破坏。其中,14mm厚u型肋对接接头的焊接细节首先出现疲劳破坏。膜片的布置可以有效提高u形肋焊缝的疲劳寿命,改善该部位的疲劳性能。
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引用次数: 0
Influence of Water Stability on Bond Performance Between Magnesium Phosphate Cement Mortar and Steel Fibre 水稳定性对磷酸镁水泥砂浆与钢纤维粘结性能的影响
Q2 Engineering Pub Date : 2019-01-01 DOI: 10.32604/SDHM.2019.04864
H. Feng, Guanghui Liu, J. Yuan, M. Sheikh, F. Lu, Jun Zhao
: The fibre pullout test was conducted to investigate the influence of the water stability on the bond behaviour between the Magnesium phosphate cement (MPC) matrix and the steel fibre. The composition of the MPC-matrix and the immersion age of the specimens are experimentally investigated. The average bond strength and the pullout energy are investigated by analysing the experimental results. In addition, the microscopic characteristics of the interface transition zone are investigated using scanning electron microscopy (SEM). The experimental results showed that the bond performance between the MPC-matrix and the steel fibre decreased significantly with the increase of the duration of immersion in water. The average bond strength between the steel fibre and the MPC-matrix reduced by more than 50% when the specimens were immersed in the water for 28 days. The effect of the water on the interface between the steel fibre and the MPC-matrix was found to be more significant compared to the composition of the MPC-matrix. In addition, the MgO-KH 2 PO 4 mole ratio of the MPC significantly influenced the water stability of the interface zone between the steel fibre and MPC-matrix.
:通过纤维拉拔试验研究了水稳定性对磷酸镁水泥(MPC)基体与钢纤维粘结行为的影响。实验研究了mpc基体的组成和试样的浸渍年龄。通过对实验结果的分析,研究了平均粘结强度和拉出能。此外,利用扫描电子显微镜(SEM)研究了界面过渡区的微观特征。实验结果表明,mpc -基体与钢纤维的粘结性能随着浸水时间的增加而显著降低。试样在水中浸泡28天后,钢纤维与mpc基体的平均粘结强度降低50%以上。与mpc -基体组成相比,水对钢纤维与mpc -基体界面的影响更为显著。此外,MPC的MgO-KH - 2 - po4摩尔比显著影响了钢纤维与MPC基体界面区的水稳定性。
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引用次数: 1
Strain transfer mechanism of grating ends fiber Bragg grating for structural health monitoring 用于结构健康监测的光栅端部光纤光栅应变传递机理
Q2 Engineering Pub Date : 2019-01-01 DOI: 10.32604/sdhm.2019.05144
Guang Chen, K. Ding, Q. Feng, X. Yin, Fangxiong Tang
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引用次数: 2
Applying Neural Networks for Tire Pressure Monitoring Systems 神经网络在胎压监测系统中的应用
Q2 Engineering Pub Date : 2019-01-01 DOI: 10.32604/SDHM.2019.07025
A. Kost, Wael A. Altabey, Mohammad Noori, Taher Awad
Applying Neural Networks for Tire Pressure Monitoring Systems
神经网络在胎压监测系统中的应用
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引用次数: 19
Comparative Study on Tree Classifiers for Application to Condition Monitoring of Wind Turbine Blade through Histogram Features Using Vibration Signals: A Data-Mining Approach 基于振动信号直方图特征的树分类器在风力机叶片状态监测中的应用对比研究:一种数据挖掘方法
Q2 Engineering Pub Date : 2019-01-01 DOI: 10.32604/sdhm.2019.03014
Joshuva Arockia Dhanraj, V. Sugumaran
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引用次数: 12
Bending and Rolling Shear Properties of Cross-Laminated Timber Fabricated with Canadian Hemlock 加拿大铁杉复合材的弯曲和轧制剪切性能
Q2 Engineering Pub Date : 2019-01-01 DOI: 10.32604/sdhm.2019.04743
Gengmu Ruan, H. Xiong, Jiawei Chen
In this paper, bending performance and rolling shear properties of crosslaminated timber (CLT) panels made from Canadian hemlock were investigated by varied approaches. Firstly, three groups of bending tests of three-layer CLT panels with different spans were carried out. Different failure modes were obtained: bending failure, rolling shear failure, bonding line failure, local failure of the outer layer and mixed failure mode. Deflection and strain measurements were employed to calculate the global and local modulus of elastic (MOE), compared with the theoretical value. In addition, a modified compression shear testing method was introduced to evaluate the rolling shear strength and modulus, compared with the results from strain measurements in bending shear tests. According to testing results, bonding line failure and rolling shear failure were dominant failure modes in bending tests, and the theoretical value of bending property was beyond the average level of the calculating results obtained from both deflection and strain measurements. In addition, the rolling shear strength and modulus obtained from compression shear tests were relatively smaller than those from bending tests.
本文采用不同的方法研究了加拿大铁杉复合材料(CLT)板的弯曲性能和轧制剪切性能。首先,对不同跨度的三层CLT板进行了三组弯曲试验。得到了不同的破坏模式:弯曲破坏、滚剪破坏、粘结线破坏、外层局部破坏和混合破坏模式。通过挠度和应变测量计算整体和局部弹性模量(MOE),并与理论值进行比较。此外,还介绍了一种改进的压缩剪切试验方法,以评估轧制剪切强度和模量,并与弯曲剪切试验中的应变测量结果进行了比较。试验结果表明,粘结线破坏和滚剪破坏是弯曲试验的主要破坏模式,弯曲性能理论值超出了挠度和应变测量计算结果的平均水平。压剪试验得到的滚剪强度和模量相对小于弯曲试验得到的。
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引用次数: 8
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SDHM Structural Durability and Health Monitoring
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