scholarly journals Annoyance Based Vibro-Acoustic Comfort Evaluation of as Summation of Stimuli Annoyance in the Context of Human Exposure to Noise and Vibration in Buildings

2020 ◽  
Vol 12 (23) ◽  
pp. 9876
Author(s):  
Krzysztof Nering ◽  
Alicja Kowalska-Koczwara ◽  
Krzysztof Stypuła
Keyword(s):  
High Speed ◽  
Residential Building ◽  
Railway Track ◽  
Simultaneous Occurrence ◽  
Noise And Vibration ◽  
Noise Current ◽  
Railway Line ◽  
High Speed Trains ◽  
Acoustic Comfort ◽  
The City

This paper presents the issues of assessing the comfort of people staying indoors who are exposed to vibrations and material noise caused by vibrations of partitions like floors and walls (ground-borne noise). Current criteria in the evaluation of vibrational and acoustic comfort cannot be assessed in the context of the simultaneous occurrence of stimuli such as noise and vibration. Railway transport, including passenger and cargo transport, is becoming increasingly prevalent, and new railway lines are being planned for environmental reasons. Sometimes, there are changes in stimuli produced by existing railway lines. For example, high-speed trains appear on an old railway track. Such a situation appeared on the Central Railway Line in Poland, which is still used by old trains, yet its operator plans to raise their speed limits. The analysis of the problem of the simultaneous occurrence of stimuli presented in this paper was based on measurements performed in a residential building located near the Central Railway Main Line in the city Zawiercie. Noise and vibration as the analyzed stimuli in both cases meet comfort requirements, yet when exposure to two stimuli was considered, comfort may be at risk.

scholarly journals Experimental settlement and dynamic behavior of a portion of ballasted railway track under high speed trains

2008 ◽  
Vol 316 (1-5) ◽  
pp. 211-233 ◽  
Author(s):  
A. Al Shaer ◽  
D. Duhamel ◽  
K. Sab ◽  
G. Foret ◽  
L. Schmitt
Keyword(s):  
Dynamic Behavior ◽  
High Speed ◽  
Railway Track ◽  
High Speed Trains

scholarly journals Analysis of massive sulphate attack to cement-treated compacted soils

2020 ◽  
Vol 195 ◽  
pp. 01009
Author(s):  
Anna Ramon-Tarragona ◽  
Eduardo Alonso
Keyword(s):  
High Speed ◽  
Good Evidence ◽  
Railway Track ◽  
Active Volume ◽  
Sulphate Content ◽  
Compacted Soils ◽  
Cement Interface ◽  
Railway Line ◽  
Long Time ◽  
Sand And Gravel

The paper describes the heave experienced by two embankments providing access to a bridge located in a high-speed railway line. The compacted soil, a mixture of a low plasticity clay, sand and gravel, had a significant sulphate content (2 – 2.5%). The embankments received a reinforcing treatment by mixing the soil with cement in the proximity of the bridge abutments. In addition, a grid of grouting columns provided more stiffness to the embankments. The embankments experienced a fast heaving rate (around 4 mm/month) in the areas improved by cement mixing. Precision extensometers indicated that heave concentrated in the upper 6 – 8 m of the embankments. The sulphate content reduced sharply to 0.25% at increasing depth. No heave was detected in these deeper zones. The swelling was found to be associated with the development of thaumasite and ettringite minerals. The presence of clay, cement and sulphates in the compacted soils and the infiltration of water from rainfall events are ideal conditions for the growth of the mentioned minerals. Long-term tests performed on compacted samples provided a good evidence of the phenomena developing in situ. A chemical modelling of the mineral changes at the soil-cement interface provided an additional insight into the development of swelling, which could last for a long time (several years). Accordingly, it was decided to underpin the railway track and to excavate the upper active volume of the embankments. This solution went in parallel with train service, which was never interrupted.

A multi-sensor fusion framework for detecting small amplitude hunting of high-speed trains

2018 ◽  
Vol 24 (17) ◽  
pp. 3797-3808 ◽  
Author(s):  
Jing Ning ◽  
Qi Liu ◽  
Huajiang Ouyang ◽  
Chunjun Chen ◽  
Bing Zhang
Keyword(s):  
Monitoring System ◽  
Sensor Fusion ◽  
Small Amplitude ◽  
High Speed ◽  
Railway Track ◽  
Support Vector ◽  
Monitoring Systems ◽  
Operation Condition ◽  
High Speed Trains ◽  
Fusion Framework

Hunting monitoring is very important for high-speed trains to achieve safe operation. But all the monitoring systems are designed to detect hunting only after hunting has developed sufficiently. Under these circumstances, some damage may be caused to the railway track and train wheels. The work reported in this paper aims to solve the detection problem of small amplitude hunting before the lateral instability of high-speed trains occurs. But the information from a single sensor can only reflect the local operation state of a train. So, to improve the accuracy and robustness of the monitoring system, a multi-sensor fusion framework for detecting small amplitude hunting of high-speed trains based on an improved Dempster–Shafer (DS) theory is proposed. The framework consists of a series of steps. Firstly, the method of combining empirical mode decomposition and sample entropy is used to extract features of each operation condition. Secondly, the posterior probability support vector machine is used to get the basic probability assignment. Finally, the DS theory improved by the authors is proposed to get a more accurate detection result. This framework developed by the authors is used on high-speed trains with success and experimental findings are provided. This multi-sensor fusion framework can also be used in other condition monitoring systems on high-speed trains, such as the gearbox monitoring system, from which nonstationary signals are acquired too.

Effect of Long-Term Bridge Deformations on Safe Operation of High-Speed Railway and Vibration of Vehicle–Bridge Coupled System

2019 ◽  
Vol 19 (09) ◽  
pp. 1950111 ◽  
Author(s):  
Hongye Gou ◽  
Longcheng Yang ◽  
Zhixiang Mo ◽  
Wei Guo ◽  
Xiaoyu Shi ◽  
...  
Keyword(s):  
High Speed ◽  
Measurement Data ◽  
Coupled System ◽  
Bridge Pier ◽  
Railway Track ◽  
Vertical Acceleration ◽  
High Speed Train ◽  
High Speed Trains ◽  
Track Deformation

Operation safety of high-speed trains is dependent on their vibration characteristics, which vary with bridge deformation. This paper studies the influence of bridge pier settlement and girder creep camber, which are two typical types of long-term bridge deformation, on the vibration of high-speed trains. To this end, an analytical approach is presented to link the bridge deformation with railway track deformation; the track deformation is used to analyze the vibration of the CRH2 high-speed train in China. The vibration analysis results are validated using the in-situ measurement data. The present study shows that bridge pier settlement greatly affects the vertical acceleration, derailment coefficient and wheel unloading rate of the high-speed train; incorporating bridge girder camber aggravates the vibration of the train–bridge system. The threshold of bridge pier settlement is suggested to be 11.1[Formula: see text]mm for trains moving at 350[Formula: see text]km/h with regard to the code-specified vibration limit. This study has significant implications for the design and operation of high-speed railways.

Reducing the Negative Effects of City Railways on Houses in Ostrava

2014 ◽  
Vol 1041 ◽  
pp. 432-435
Author(s):  
Leopold Hudeček ◽  
Jiří Svoboda ◽  
Jan Kramný
Keyword(s):  
Residential Buildings ◽  
Residential Building ◽  
Vertical Vibration ◽  
Railway Track ◽  
Negative Effects ◽  
Noise And Vibration ◽  
Rail Track ◽  
The Road ◽  
Ex Post ◽  
Negative Effect

The paper discusses measures to reduce the negative effects of tram traffic on residential house in Ostrava, where the tram line passes through the street area located under the structure of the house see Figure 1.Fig.1HouseNo.1340inOstravaaffectedbyvibrationsfromrailtransportThe lines of urban railways are often kept at densely built-up areas, often in close proximity to the buildings. It is necessary to put a high emphasis on protection against noise and vibration. In case of structures for residential buildings it has a negative effect on residents. An efficient way to reduce the vibration levels of the protected structure and thus the secondary noise is elastic foundation structure as a whole to its support structure. But in practice, we need to solve the problem of the ex post, i.e. when the structure of a residential building already exists.To reduce the transmission of vibrations to the structure was carried out technical measures for vibration attenuation along the route of the spread it is the path from the source to the protected structure. Railway track was imposed on rubber anti-vibration mats under gravel bed of tram line. Furthermore, the test sections were established in order to test the application of different materials used as a grout space between the rails and the surrounding environment and the reference section to compare the resulting data.Subsequently was held the measurement of noise and vibration. Vibrations were measured on the own construction of the house, also on the communication - vertical vibration near the track (30 cm far from the running rail track), these data present the transmission of vibration from the rail and sleepers in the immediate surroundings, measuring the vertical vibrations of the road (150 cm far from the running rail track in place that was not affected by reconstruction), these data present the transmission of vibration to the subsoil neighborhood.

scholarly journals Tourist tongues: High-speed rail carries linguistic and cultural urbanisation beyond the city limits in Guangxi, China

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Alexandra Grey
Keyword(s):  
Social Distance ◽  
High Speed ◽  
Linguistic Features ◽  
High Speed Rail ◽  
Republic Of China ◽  
Mobile Capital ◽  
High Speed Trains ◽  
The City ◽  
Urban Places ◽  
Local Languages

AbstractThis article builds upon research which analyses the reconstruction of cities in China as an integral part of image-making discourses competing to attract mobile capital. It extends that literature beyond urban places to urbanisation processes, examining the material and linguistic features of networks and discourses of new high-speed rail infrastructure Guangxi, a poorer, rural, multilingual and multiethnic region of the People’s Republic of China (China) in which tourism – propelled by high-speed trains – has become a pillar of economic development. It argues that these trains produce symbolically powerful discourses which contribute to cultural urbanisation across Guangxi, emplacing urban norms outside city limits in pursuit of profitable sameness, as tourism does not trade only upon difference. Local multilingualism, specifically, is erased as too different, a barrier to tourists’ (and tourism capital’s) mobility. Amongst other ramifications, this reproduces social distance and ideologically displaces local languages.

scholarly journals Business travel decisions and high-speed trains: an ordered logit approach

REGION ◽  
2019 ◽  
Vol 6 (3) ◽  
pp. 1-16
Author(s):  
Federica Rossi ◽  
Rico Maggi
Keyword(s):  
Travel Time ◽  
High Speed ◽  
Professional Status ◽  
Ordered Logit ◽  
Business Travel ◽  
Railway Line ◽  
Swiss Canton ◽  
High Speed Trains ◽  
Potential Impact ◽  
Travel Decisions

The paper studies the potential impact on business travel of the new high-speed railway line project, called AlpTransit, which will link Lugano, the small economic hub of the southern part of Switzerland, with Zurich, one of the major Swiss economic centres, situated north of the Alps. Thanks to this infrastructure, travel time between the two cities will decrease considerably from about three hours to less than two hours by the end of 2020. The question that we pose in this paper is what impact high-speed trains could have, in the short to medium term, on business travel between the two hubs (ex-ante evaluation). Indeed, given the travel time, firms could increase their business-to-business one-day trips, boosting face-to-face interactions within and among enterprises. Our curiosity more specifically regards the potential impact of the change in travel time on the propensity to travel of employees with different functions in various types of firms. An on-line survey was conducted among firms located in Ticino, the Swiss Canton that includes Lugano. The data are analysed using four ordered logit models, one for each employee category (CEO, administrative staff, sales personnel, specialists), since hierarchical position and professional status influence business travel characteristics. Results show that internal firm characteristics, such as sector, frequency and destination of current business travels significantly influence the propensity to travel to Zurich more often thanks to AlpTransit.

scholarly journals FROM PLANTATION PRODUCTS TRANSPORTATION TO HUMAN TRANSPORTATION: THE HISTORY OF HIGH SPEED RAILWAY IN DUTCH EAST INDIES 1929 - 1942

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Omar Mohtar
Keyword(s):  
Travel Time ◽  
High Speed ◽  
The Public ◽  
East Indies ◽  
Railway Line ◽  
Railway Company ◽  
High Speed Trains ◽  
History Of ◽  
Dutch East Indies ◽  
Historical Methods

The train that appeared in Dutch East Indies in the mid 19th century was originally used for plantation product transport. However, the train was also used as transportation for the public. In 1894, between Batavia and Surabaya was connected with the railway line. Both cities can be reached by train in two days. To reduce travel time between those two cities, the Dutch East Indies railway company, Staatsspoorwegen was launched two high-speed trains, Eendaagsche Express in 1929 and Java Nacht Express in 1936. These two high-speed trains brought changes for railways condition in Dutch East Indies, especially in Java. During operation, these two high-speed trains also had interesting stories to write about. To write this problem, historical methods are used which consisting of heuristics, criticism, interpretation, and historiography. Based on the research conducted, these two high-speed trains made the travel time of Batavia – Surabaya 12 hours and made railways technology in the Dutch East Indies develop.

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