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Metro Vehicle Axle Temperature Monitoring Device Based on Piezoelectric Vibration 基于压电振动的地铁车辆轴温监测装置
Pub Date : 2019-12-10 DOI: 10.11648/J.IJTET.20190504.14
Yiyun Zhao, Ruyan Huang
The axle temperature monitoring of subway vehicles is a key technology to ensure the safety of trains. The existing axle temperature monitoring system is monitored by using trackside equipment or using axle temperature test paper, the system has the inferiority of poor real-time performance. In order to realize real-time and online monitoring of axle temperature, this paper presents a subway axle temperature monitoring device based on vibration energy recovery. The device is installed on the shaft end of the train axle, and uses the positive piezoelectric effect of piezoelectric ceramics to absorb vibration energy into electric energy, and continuously sends temperature signal through the radio frequency module to realize real-time monitoring of train axle temperature. A mathematical model of piezoelectric vibrator power output was established to obtain design parameters suitable for rail vehicle vibration, and the Ansys Workbench finite element analysis software was used for theoretical simulation verification. Finally, an experimental model was built and a vibration test was carried out on Shanghai metro line 1. The results show that the axial temperature monitoring device based on piezoelectric vibration can effectively obtain the axial temperature data and realize the online monitoring function.
地铁车辆轴温监测是保障列车安全运行的关键技术。现有的轴温监测系统多采用轨旁设备或轴温试纸进行监测,实时性差。为了实现对车轴温度的实时在线监测,本文提出了一种基于振动能量回收的地铁车轴温度监测装置。该装置安装在列车车轴的轴端,利用压电陶瓷的正压电效应吸收振动能量转化为电能,并通过射频模块连续发送温度信号,实现对列车车轴温度的实时监测。建立了压电激振器功率输出的数学模型,得到了适合轨道车辆振动的设计参数,并利用Ansys Workbench有限元分析软件进行了理论仿真验证。最后,在上海地铁1号线上建立了试验模型并进行了振动试验。结果表明,基于压电振动的轴向温度监测装置能够有效地获取轴向温度数据,实现在线监测功能。
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引用次数: 1
Finite Element Modeling and Static Strength Analysis on Structure Strength of the High-Speed Maglev Bogie 高速磁悬浮转向架结构强度有限元建模及静强度分析
Pub Date : 2019-12-10 DOI: 10.11648/J.IJTET.20190504.15
X. Shimeng, L. Cen, Yao Yijing, Yu Yuqing, Liu Weiya, Li Qiang
Maglev train with no mechanical contact of the innovative technology, as well as a series of excellent economic and environmental advantages came into being. More and more people pay attention to it, and it has become one of the most promising transportation means in the new century. According to the actual operation of maglev train, a boundary constraint method is proposed in this paper. On the basis of the actual operation of maglev train, a method of boundary constraint is proposed, and the finite element model is established by using HyperMesh software. Afterwards using ANSYS analysis software to analyzed the statics performance of levitation chassis under the four working conditions of maglev vehicle, and static strength of the levitation chassis based on von Mises stress was assessed. In accordance with the results, the parts with high stress are optimized. The result showed that the stress intensity on the back of the air spring mounting base is relatively high. This situation can be improved by changing the radius to 40 mm fillets. The strength of other parts meets the standard requirement and provided the basis for further optimization calculation. The results have laid a foundation for the fatigue strength test of the suspension chassis of high-speed maglev train.
磁悬浮列车具有无机械接触的创新技术,以及一系列优异的经济和环境优势应运而生。越来越多的人关注它,它已经成为新世纪最有前途的交通工具之一。根据磁悬浮列车的实际运行情况,提出了一种边界约束方法。根据磁悬浮列车的实际运行情况,提出了边界约束方法,并利用HyperMesh软件建立了有限元模型。随后利用ANSYS分析软件对悬浮底盘在磁悬浮车辆四种工况下的静力学性能进行了分析,并基于von Mises应力对悬浮底盘的静强度进行了评估。根据结果,对高应力零件进行了优化。结果表明,空气弹簧安装底座背面的应力强度较大。这种情况可以通过将圆角半径改为40mm来改善。其他部分强度满足标准要求,为进一步优化计算提供依据。研究结果为高速磁悬浮列车悬架底盘疲劳强度试验奠定了基础。
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引用次数: 1
Quality Acceptance Methods and Standards for Continuous Compaction Control Technology 连续压实控制技术质量验收方法与标准
Pub Date : 2019-11-18 DOI: 10.11648/J.IJTET.20190504.13
Zhang Daoxiu, Jiang Huihuang, Gao Ming-xian, Zhang Jiandong, Xiang Weiguo, Yan Xiaoxia, Guo Dong, Zhao Chongji, Wu Longliang
In order to promote the wide application of continuous compaction control technology in China, the continuous compaction control technical regulations of various countries and regions in the world are taken as research objects, and the technical characteristics and application conditions of various countries' regulations are compared and analyzed. The current continuous compaction control technology is analyzed. The main quality acceptance methods and standards, summed up the application experience of the technology around the world. The results show that the comprehensive evaluation of the comprehensive evaluation of compaction degree, compaction uniformity and compaction stability is the trend of quality control standards development. The calibration method is mainly used. The problem of water content of fine particle fillers has a significant impact on continuous compaction control and has been widely recognized. The water content of the filler needs to be controlled in engineering applications. The basic theory of continuous compaction control method is becoming more and more mature, and the development direction of the actual compaction problem is gradually developed. The accuracy requirement of continuous compaction control is gradually improved. The weak area identification method is supplemented by the incremental method of measurement. The reasonable selection of evaluation methods for engineering characteristics is an effective way to promote the successful application of continuous compaction control technology.
为了促进连续压实控制技术在中国的广泛应用,以世界各国和地区的连续压实控制技术法规为研究对象,对各国法规的技术特点和应用条件进行了比较分析。分析了当前连续压实控制技术。介绍了主要的质量验收方法和标准,总结了世界各国技术的应用经验。结果表明,对压实度、压实均匀性和压实稳定性进行综合评价是质量控制标准发展的趋势。主要采用标定法。细颗粒填料的含水率问题对连续压实控制有重要影响,已得到广泛认可。在工程应用中,填料的含水量需要控制。连续压实控制方法的基本理论日趋成熟,实际压实问题的发展方向也逐渐发展起来。连续压实控制精度要求逐步提高。弱区识别法辅以增量测量法。合理选择工程特性评价方法是促进连续压实控制技术成功应用的有效途径。
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引用次数: 1
Gaining Competitive Advantage at Sea: An Overview of Shipping Lines’ Strategic Decisions 获得海上竞争优势:航运公司战略决策综述
Pub Date : 2019-10-31 DOI: 10.11648/J.IJTET.20190504.12
Enrico D'agostini, Hyung-Sik Nam, Seung-Hyeob Kang
The liner shipping sector has significantly changed in recent years. Largest shipping lines have expanded their business scope becoming global carriers and a recent wave of industry consolidation has profoundly modified the market structure and, consequently, the business models followed by liners. This, coupled with weak market fundamentals, generally poor balance sheets, and ordering of increasingly larger container vessels, has led each shipping line to follow a specific dominant strategy aimed at increasing market shares, margins and creating value for costumers. This article proposes an overview of the main market strategies pursued by the largest shipping lines. Through an analysis of major container lines strategies, the study aims at identifying what are the preferred strategies to gain competitive advantage. Particularly, the concept of diversification (product and geographical diversification), modes of diversification (internal and external), differentiation and concentration are comprehensively discussed and applied to the liner shipping industry. Furthermore, it tries explaining what are the most significant similarities and differences in market strategies in relation to the size of each shipping line. The review of our analysis suggests that 1) all shipping lines follow a hybrid strategic model with more than one individual strategy pursued 2) larger shipping lines prefer to diversify or differentiate 2) mid-sized shipping and smaller lines tend to pursue market concentration.
近年来,班轮运输业发生了重大变化。大型航运公司已经扩大了业务范围,成为全球承运商,最近的行业整合浪潮深刻地改变了市场结构,从而改变了班轮公司所遵循的商业模式。再加上疲软的市场基本面、普遍糟糕的资产负债表和越来越大的集装箱船订单,导致每家航运公司都遵循一种特定的主导战略,旨在增加市场份额、利润率和为客户创造价值。本文提出了一个概述的主要市场战略所追求的最大的航运公司。通过对主要集装箱航线战略的分析,本研究旨在确定获得竞争优势的首选战略。特别是对多元化的概念(产品多元化和地域多元化)、多元化模式(内部多元化和外部多元化)、差异化和集中化进行了全面探讨,并将其应用于班轮航运业。此外,它试图解释什么是最显着的相似点和不同的市场战略,关系到每个航运公司的规模。对我们分析的回顾表明:1)所有航运公司都遵循一种混合战略模型,并追求不止一种单独的战略;2)较大的航运公司倾向于多样化或差异化;2)中型航运公司和较小的航运公司倾向于追求市场集中化。
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引用次数: 3
Predicting of the Residual Resource of Car Assemblies 汽车装配件剩余资源的预测
Pub Date : 2019-10-26 DOI: 10.11648/J.IJTET.20190504.11
I. Vladimir, V. Tatyana, P. Stanislav
The research paper introduces a method that can be used for the forecasting the residual life of automobile aggregates (through the example of automobile engines). The results of a test-drive have shown that the proposed method is less labor intensive and has a satisfactory forecast accuracy. In the research the tenets of the reliability theory and mathematical statistics were used as well as information on the post-repair operating time of repaired engines based on the value of the initial main parameter (the gap between the piston and cylinder) for 41 engines. The probability density of this parameter follows the Gauss’ law. In our work we accept the nonlinear change in the mathematical expectation of the main parameter depending on the operating time in the form of a power law. The probability density of the aggregate resource is distributed according to the Weibull law. Adequacy of theoretical information to experimental data was determined by the Fisher criterion. The forecasting of the residual life of the aggregates is relevant when the operating time approaches their limit state. The relative forecast error varies from 0.021 to 0.130, which is quite acceptable for the real-world applications.
本文介绍了一种预测汽车集料剩余寿命的方法(以汽车发动机为例)。试驾结果表明,该方法具有较低的劳动强度和较好的预测精度。本研究运用可靠性理论和数理统计的基本原理,根据41台发动机的初始主要参数(活塞与气缸之间的间隙)的值,得到修理后发动机的工作时间信息。该参数的概率密度遵循高斯定律。在我们的工作中,我们以幂律的形式接受主要参数的数学期望随工作时间的非线性变化。集合资源的概率密度按照威布尔定律进行分布。理论信息与实验数据的充分性是由Fisher准则确定的。当运行时间接近其极限状态时,对骨料的剩余寿命进行预测是有意义的。相对预测误差在0.021到0.130之间,对于实际应用来说是完全可以接受的。
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引用次数: 0
Blockchain Technology as a Risk Mitigation Tool in Supply Chain 区块链技术作为供应链中的风险缓解工具
Pub Date : 2019-10-15 DOI: 10.11648/j.ijtet.20190503.12
Mian Wasim Layaq, Alexander Goudz, B. Noche, Muhammad Atif
The main purpose of this paper is to investigate the research development in supply chain risk management (SCRM) and to connect the new emerging digital technology Blockchain that could help to mitigate risks in any supply chain. Emerging literature, case studies, citations are used to fulfil this the task. The study will explore Blockchain and supply chain risks in details and will compare, how Blockchain based supply chain can mitigate these risks. There are many risks associated to supply chains but we will limit our study to only supply risk and study different areas of Blockchain application in supply chain with supply risk. Blockchain technologies have a potential to upgrade current supply chains. This will not only increase its performance in terms of speedy flow of raw material, finished goods, information and money flow but also help to mitigate current risk in supply chain by increasing visibility and transparency of supply chain. Smart contracts, IoT and Blockchain can serve together to achieve maximum efficiency and effectiveness in SCM. This research contributes to explore further research fields of Blockchain technology in different areas of supply chain risk management.
本文的主要目的是研究供应链风险管理(SCRM)的研究进展,并连接新兴的数字技术区块链,这有助于减轻任何供应链中的风险。新兴文献,案例研究,引文被用来完成这项任务。该研究将详细探讨区块链和供应链风险,并将比较基于区块链的供应链如何减轻这些风险。与供应链相关的风险有很多,但我们将把我们的研究局限于供应风险,并研究区块链在供应链中不同领域的应用。区块链技术有可能升级当前的供应链。这不仅会提高其在原材料,成品,信息和资金流动方面的性能,而且还有助于通过提高供应链的可见性和透明度来减轻当前供应链中的风险。智能合约、物联网和区块链可以一起服务,以实现供应链的最高效率和有效性。本研究有助于探索区块链技术在供应链风险管理不同领域的进一步研究领域。
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引用次数: 7
An Evaluation for the Use of Blockchain Technology in Logistics 区块链技术在物流中的应用评估
Pub Date : 2019-05-10 DOI: 10.11648/J.IJTET.20190501.12
Alexander Goudz, Valentino Steiner
The following article sums up the current problems of the logistics and explains how the Blockchain technology can help to solve some of them. A utility value analysis is used to quantify the scenarios the Blockchain is most likely to be used in. This offers a result that, in comparison to current research, does not only show the opportunities but also how likely they are to be used in these sections. In the next step these scenarios are compared with each other. These results lead to a outlook to potential applications of the Blockchain technology in the logistics.
下面的文章总结了目前物流存在的问题,并解释了区块链技术如何帮助解决其中的一些问题。使用效用价值分析来量化区块链最有可能被使用的场景。这提供了一个结果,与目前的研究相比,不仅显示了机会,而且还显示了它们在这些部分中使用的可能性。在下一步中,将对这些场景进行相互比较。这些结果对区块链技术在物流中的潜在应用前景进行了展望。
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引用次数: 5
Roadway Pavement Design Methods, Structural Approaches and Relevant Computer Algorithms: A Critical Review 道路路面设计方法、结构方法和相关计算机算法综述
Pub Date : 1900-01-01 DOI: 10.11648/j.ijtet.20220801.12
Elvis Siaway Kwado Mensahn, Surajo Abubakar Wada, Lameck Lugeiyamu
: Transport and international agencies invest millions of dollars on road projects to support countries develop their infrastructure; therefore, it is important to ensure longer service life and value for money. The primary function of the pavement structure is to keep distresses, including fatigue cracking and permanent deformation, to an acceptable limit so that the pavement can withstand applied vehicle load and repetitions during the service duration. Furthermore, the layered structure of the pavement is intended to ensure that the vehicle contact pressure is distributed in such a way that critical responses at the bottom layer of the pavement are low enough to avoid severe damage. Two typical procedures associated with roadway pavement design are empirical-based and structural analysis methods. However, the empirical-based methods have significant shortcomings, as predicting the mode and extent of pavement performance becomes a major challenge. Alternatively, the structural analysis methods have advanced extensively with computers since they consider crucial factors such as traffic loads, material characteristics and environmental conditions. The imputation of these parameters into the computer algorithm contributes to a better understanding of the mechanical performance of constituent pavement material responses. The predicted responses enable highway engineers to select appropriate pavement compositions that will deteriorate at a satisfactory level during the time of service. The most common structural analysis approaches are analytical modelling and numerical simulation. On the other hand, differences in analysis results generation using these approaches have been a notable concern. This review article presents a synopsis of typical pavement design methods and the problem connected with them; structural approaches to identify factors influencing their accuracy. Furthermore, computer algorithms use due to their usefulness, and the assumptions of layered theories employed in pavement structural design are discussed to uncover potential drawbacks for future upgrades.
运输和国际机构在道路项目上投资数百万美元,以支持各国发展基础设施;因此,确保更长的使用寿命和物有所值是很重要的。路面结构的主要功能是保持损伤,包括疲劳开裂和永久变形,在可接受的限度内,使路面能够承受车辆荷载和在使用期间的重复。此外,路面的分层结构旨在确保车辆接触压力的分布,使路面底层的临界响应足够低,以避免严重损坏。与道路路面设计相关的两种典型方法是基于经验的方法和结构分析方法。然而,基于经验的方法有明显的缺点,因为预测路面性能的模式和程度是一个主要的挑战。另外,结构分析方法随着计算机的发展而广泛发展,因为它们考虑了交通载荷、材料特性和环境条件等关键因素。将这些参数输入计算机算法有助于更好地理解组成路面材料响应的力学性能。预测的响应使公路工程师能够选择适当的路面成分,使其在服务期间恶化到令人满意的水平。最常用的结构分析方法是解析建模和数值模拟。另一方面,使用这些方法生成的分析结果的差异是一个值得关注的问题。本文综述了典型的路面设计方法及其所涉及的问题;结构方法确定影响其准确性的因素。此外,由于计算机算法的有用性,本文还讨论了路面结构设计中采用的分层理论的假设,以揭示未来升级的潜在缺陷。
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引用次数: 1
Assessment of the Effect of out-of-Stock on Customers Purchasing Behavior 缺货对顾客购买行为影响的评估
Pub Date : 1900-01-01 DOI: 10.11648/j.ijtet.20190502.11
Dawit Hussein Ali
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引用次数: 1
The Effect of Pavement Damage on Number of Accidents and on Traffic Congestion on Roads Using Multivariate Analysis of Variance 基于多变量方差分析的路面损伤对道路事故数量和交通拥堵的影响
Pub Date : 1900-01-01 DOI: 10.11648/j.ijtet.20220801.11
Angelina Auma Abuodha Oyoo, Moses Wakoli Wamalwa, Pius Nderitu Kihara
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引用次数: 1
期刊
International Journal of Transportation Engineering and Technology
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