Deciphering Aspects of Civil Engineering on Railway Transportation and Ridership Capacity

How do civil engineers make all public transportation infrastructure possible to improve the ridership capacity and railway system networks? 

     Abstracts in lab reports are known for summarizing the entire piece with enough information for readers to decide where to locate and read the whole report. An introduction is where we establish our essential work and provide details to help readers understand how the more recent studies contribute new information to the field and to communicate the purpose. Referencing the article “Vibration Characteristics of Underground Structure and Surrounding Soil Underneath High-Speed Railway Based on Field Vibration Tests,” The engineers summarize the field vibration tests that occurred at an underground metro station underneath the high-speed railway. They introduced the conditions of underground structures tumbling apart because of aging and vibration methods. In the second article “An Optimization Method of High-Speed Railway Rescheduling to Meet Unexpected Large Passenger Flow,” the engineers part of this experiment summarizes a proposal for arranging time stamps to control ridership capacity while introducing rescheduling plans as well.

     The engineering applied to new infrastructure in various cities has brought many advantages to public transportation. Transportation is a significant factor in developing urban regions. They play an essential role in the rapidly changing multimodal transportation market, providing train services and undertaking social service responsibilities in helping other transportation modes meet emergencies. Railway systems efficiency improves through the technical improvement of infrastructure and vehicles and through introducing a change in the modal split. From the first development of infrastructure during the earlier centuries for railways worldwide, an effective alternative is to avoid traffic along streets while driving. Ridership capacity is one of the most challenging phases for engineers. Likewise, the time and effort put into making a railway system reliable, valuable and safe for traveling passengers. As the years progressed, major infrastructure renovations took place to attract more people to ride the public transportation system. In other words, new railway tunnels, tracks, stations, and train station hubs worldwide increase ridership capacity while also controlling railway etiquettes (crowds of passengers.) These buildings’ construction takes years to complete because of the planning, designing, total costs, and structuring of the tunnels surrounded by the soils below the street surface and inspections of the infrastructure to ensure people’s safety. The possibility of new and improved infrastructure has brought many more people to ride the railway/subway system.

     When constructing tunnels for railway systems, a vibration test has to occur (measurement of the depth below the surface and surrounding soil layers) before digging through the soil to create a route. In the article “Vibration Characteristics of Underground Structure and Surrounding Soil Underneath High-Speed Railway Based on Field Vibration Tests,” engineers Biao Zhou, Fengshou Zhang, and Xiongyao Xie install measuring arrays to calculate the wave propagation in the soil layers. The “Attenuation Characteristics of Vibration” section depicts a wheel detector procedure to calculate a railcar’s force and the passing time. The stiffness of the underground structure affects the attenuation characteristics of body waves. According to the engineers, the waveforms and propagation velocities of vibration waves are the essential features that can determine the wave types and adjust parameters until the calculated result matches the structure. Measuring the travel time between measurement points in the time domain or the wave phase shift based on methods in the frequency domain determines the velocities of the vibration waves.

     Passengers have high demands for public transportation when it comes to constructed infrastructure, so engineers united a solution to resolve passenger flow issues. The dispatching measure of modifying stopping plans indicates whether an existing paper adds a stop at the destination station. Changing controlling methods may affect service quality and operation efficiency. The extension of train travel time may not only influence the punctuality of its existing passengers but also disturb the adjacent trains causing consecutive delays. In the “An Optimization Method of High-Speed Railway Rescheduling to Meet Unexpected Large Passenger Flow,” engineers: Junduo Zhao, Haiying Li, Lingyun Meng, and Jianrui Miao all perform this experiment to calculate the travel times between five main stations: Shanghai Hongqiao, Nanjingnan, Xuzhoudong, Jinanxi, and Beijingnan while also calculating dwell times, arrival and departure times. Dwell times are durations a train holds at a train station. When a train arrives at a station, the conductor controls the doors. Depending on whether the dispatcher’s lights flash, the train should hold until clearance is given for the train to proceed. The number of delayed trains permitted can influence the strategy of modifying the stopping plans.

     The results are a way to provide complete and organized data collected relevant to the hypothesis given in the introduction and emphasize the essential values, associations, etc. The vibration test experiment delivered the results of the ambient test showing that the underground metro station and surrounding soil shared many resonance frequencies. Also, the metro station structure and soil offer good transmission properties at the low-frequency range below 10 Hz based on the transfer function and displacement analysis. The engineers from the ridership capacity experiment delivered the results that “1100 passengers from ULPF can be served by all the trains in this rescheduling operation plan, including the insertion of additional trains, while the boundary values of the number of adding stops and the number of delayed trains are sufficient.”  

     Conclusions and discussions are where we interpret results and summarize the most important points from the hypothesis tested and experiment performed. The engineers of the vibration tests, Biao Zhou, Fengshou Zhang, and Xiongyao Xie, concluded that “wave velocity has a more recognizable effect because of its sensitivity to structural stiffness and requires fewer sensors on the site.” Therefore, a complicated procedure to determine vibration waves in subsurface systems and surrounding soils. The corporation Hindawi of the Vibration Characteristics article acknowledges the Shangai Shentong Metro Corporation with support from the National Natural Science Foundation of China and Shanghai Science and Technology Innovation Plan Funds.

     In addition to the conclusion of the experiments, the engineers of ridership capacity: Junduo Zhao, Haiying Li, Lingyun Meng, and Jianrui Miao, concluded that “by adding train stops and trains to revenue service, the experiment solved the design issue of rescheduling operations on high-speed rail corridors. The results also met the expectations of a large passenger flow generated by disrupting other transportation modes. Time constraints address the additional dwelling time, train acceleration, and deceleration time restrictions while modifying the stopping plans.” As mentioned in the last paragraph, the same corporation Hindawi acknowledges the support from the Fundamental Research Funds for the Central Universities and the National Key Research and Development Plan. 

     In conclusion to this analysis, both lab reports follow the order of the formatting in chapter 19, with the title and abstract at the beginning summarizing the whole lab report, the introduction, materials/methods, results, discussion, conclusions, and acknowledgments. The author of both pieces formatted their lab reports to give a full breakdown of constructing the railway system and controlling passenger crowds with the appropriate mathematics applied to their project. The diagrams included in the articles showcase the results of each scenario when performing the experiments. As engineers, math, and designs help readers understand the challenge of building infrastructure for public transportation in urban regions to provide travelers with reliable service in their hometowns regardless of the duration of projects while also addressing large passenger crowds at different train stations. Therefore, the newly constructed public transportation infrastructure brings more people to ride the railway/subway system.

Works Cited:

Vibration Characteristics of Underground Structure and Surrounding Soil Underneath High-Speed Railway Based on Field Vibration Tests: Hindawi Shock and Vibration Volume 2018, Article ID 3526952

Engineers: Biao Zhou, Fengshou Zhang, and Xiongyao Xie

Academic Editor: Sakdirat Kaewunruen

Published: May 23rd, 2018

https://doi.org/10.1155/2018/3526952

An Optimization Method of High-Speed Railway Rescheduling to Meet Unexpected Large Passenger Flow: Hindawi Journal of Advanced Transportation Volume 2022, Article ID 5964010

Engineers: Junduo Zhao, Haiying Li, Lingyun Meng, and Jianrui Miao

Academic Editor: Gabriella Mazzulla

Published: August 18, 2022

https://doi.org/10.1155/2022/5964010