Cen Li, Yi Yin, Nan Qian, Binjie Wang, Shouguang Sun
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引用次数: 0
Abstract
Dynamic stress is one of the key indicators reflecting the fatigue characteristics of metro bogie frames. Considering the test costs, operation safety, and other factors, it is impossible to record all the dynamic stress data for the whole service period in the tracking test. Therefore, the overall stress spectrum is statistically deduced based on limited dynamic stress data samples, which can not only provide a basis for the fatigue reliability research of the bogie frame, but also save costs. In this paper, the typical fatigue control points in different areas of the frame with large equivalent stress are selected for research. The daily measured stress spectrum samples are obtained through the rainflow counting method, and the statistical stress spectrum is then compiled. Weibull distribution fitting of the stress spectrum is carried out to obtain the scale and shape parameter samples for different fatigue control parts. After sampling of the obtained parameter samples and conducting variance homogeneity tests as well as t-tests, the minimum sample size representing the overall distribution of the interval is obtained. Therefore, the shortest tracking test period reflecting the overall stress distribution of typical fatigue control parts can be obtained.
动应力是反映地铁转向架疲劳特性的关键指标之一。考虑到试验成本、运行安全等因素，跟踪试验不可能记录整个服役期的所有动应力数据。因此，根据有限的动态应力数据样本，统计推导出整体应力谱，既能为转向架构架的疲劳可靠性研究提供依据，又能节约成本。本文选取构架不同区域等效应力较大的典型疲劳控制点进行研究。通过雨流计数法获得每日测量的应力谱样本，然后编制统计应力谱。对应力谱进行 Weibull 分布拟合，以获得不同疲劳控制部位的尺度和形状参数样本。对获得的参数样本进行取样，并进行方差齐性检验和 t 检验后，得到代表区间总体分布的最小样本量。因此，可以获得反映典型疲劳控制部件整体应力分布的最短跟踪测试周期。
期刊介绍：
Urban Rail Transit is a peer-reviewed, international, interdisciplinary and open-access journal published under the SpringerOpen brand that provides a platform for scientists, researchers and engineers of urban rail transit to publish their original, significant articles on topics in urban rail transportation operation and management, design and planning, civil engineering, equipment and systems and other related topics to urban rail transit. It is to promote the academic discussions and technical exchanges among peers in the field. The journal also reports important news on the development and operating experience of urban rail transit and related government policies, laws, guidelines, and regulations. It could serve as an important reference for decision¬makers and technologists in urban rail research and construction field.
Specific topics cover:
Column I: Urban Rail Transportation Operation and Management
• urban rail transit flow theory, operation, planning, control and management
• traffic and transport safety
• traffic polices and economics
• urban rail management
• traffic information management
• urban rail scheduling
• train scheduling and management
• strategies of ticket price
• traffic information engineering & control
• intelligent transportation system (ITS) and information technology
• economics, finance, business & industry
• train operation, control
• transport Industries
• transportation engineering
Column II: Urban Rail Transportation Design and Planning
• urban rail planning
• pedestrian studies
• sustainable transport engineering
• rail electrification
• rail signaling and communication
• Intelligent & Automated Transport System Technology ?
• rolling stock design theory and structural reliability
• urban rail transit electrification and automation technologies
• transport Industries
• transportation engineering
Column III: Civil Engineering
• civil engineering technologies
• maintenance of rail infrastructure
• transportation infrastructure systems
• roads, bridges, tunnels, and underground engineering ?
• subgrade and pavement maintenance and performance
Column IV: Equipments and Systems
• mechanical-electronic technologies
• manufacturing engineering
• inspection for trains and rail
• vehicle-track coupling system dynamics, simulation and control
• superconductivity and levitation technology
• magnetic suspension and evacuated tube transport
• railway technology & engineering
• Railway Transport Industries
• transport & vehicle engineering
Column V: other topics of interest
• modern tram
• interdisciplinary transportation research
• environmental impacts such as vibration, noise and pollution
Article types:
• Papers. Reports of original research work.
• Design notes. Brief contributions on current design, development and application work; not normally more than 2500 words (3 journal pages), including descriptions of apparatus or techniques developed for a specific purpose, important experimental or theoretical points and novel technical solutions to commonly encountered problems.
• Rapid communications. Brief, urgent announcements of significant advances or preliminary accounts of new work, not more than 3500 words (4 journal pages). The most important criteria for acceptance of a rapid communication are novel and significant. For these articles authors must state briefly, in a covering letter, exactly why their works merit rapid publication.
• Review articles. These are intended to summarize accepted practice and report on recent progress in selected areas. Such articles are generally commissioned from experts in various field s by the Editorial Board, but others wishing to write a review article may submit an outline for preliminary consideration.
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