<title>Strain monitoring of a newly developed precast concrete track for high speed railway traffic using embedded fiber optic sensors</title>

In this paper, in order to improve the high speed railway sustainable competitive advantage as the research objective, systematic analysis of the high-speed railway to obtain sustainable competitive advantage evaluation index, including high-speed railway traffic function advantage, competitive advantage, advantage of positive externality, the Delphi method is used to scientific empowerment of these factors, by constructing fuzzy comprehensive evaluation model, the research conclusion is highway and air passenger is higher than that in high speed railway of competitive advantage

Download Full-text

Strain monitoring of flexible membrane structure by using fiber-optic sensors

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2004.6.0_253 ◽

2004 ◽

Vol 2004.6 (0) ◽

pp. 253-254

Author(s):

Kazuro Kgeyama ◽

Hideaki Murayama ◽

Kiyoshi Uzawa ◽

Isamu Ohsawa ◽

Makoto Kanai ◽

...

Keyword(s):

Membrane Structure ◽

Fiber Optic ◽

Fiber Optic Sensors ◽

Flexible Membrane ◽

Strain Monitoring

Download Full-text

Real-Time Database System Implementation of Railway Signal Power Source Remote Monitoring

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.128-129.961 ◽

2011 ◽

Vol 128-129 ◽

pp. 961-964

Author(s):

Zhi Jian Qu ◽

Li Liu

Keyword(s):

Power Supply ◽

Remote Monitoring ◽

High Speed ◽

Low Voltage ◽

Signal Power ◽

High Speed Railway ◽

Railway Traffic ◽

Power Failure ◽

Railway Signal ◽

Real Time Database

Railway signal is a key technology for high-speed railway，which is the foundation to keep the high-speed train line. Railway signal power is the automatic blocking of railway lines and 10kV lines transform into 380V power through after the power supply for railway signals. Signal power as the railway traffic signal of the power supply, it belongs to the first level of power system load. Its 10kV high voltage side stik up by the major of electric, 380V low voltage side maintenance by the signal major. When the signal power failure, often occur shirk responsibilities between the different majors, in order to define the responsibilities of the accident better, which need automation remote monitoring for main railway lines of the railway signal power and scheduling control as soon as possible[1-3].

Download Full-text

A New Monitoring Method of Wheel/Rail Contact Forces Caused by Out-of-Round Railway Wheels

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.178-181.1125 ◽

2012 ◽

Vol 178-181 ◽

pp. 1125-1130

Author(s):

Zhi Chen Wang ◽

Ying Song ◽

Ying Ming Shen

Keyword(s):

Traffic Safety ◽

High Speed ◽

Test System ◽

Simulation Software ◽

Contact Forces ◽

Strain Gauges ◽

Monitoring Method ◽

High Speed Railway ◽

Railway Traffic ◽

Railway Wheels

Traditional methods of wheel-rail contact forces measurement all need strain gauges on wheel sets or rails. The shortcomings of strain gauges such as zero-drift, poor anti-interference property and instability of test system can’t meat wheel/rail force test requirements in high-speed railways. A method based on PVDF piezoelectric sensing technology is presented for the test of wheel/rail contact force. Firstly, on the basis of the theory of vehicle-track coupling dynamics and by means of simulation software ADAMS/Rail, a three-dimensional train-track simulation model is established. Secondly, the modes and characteristics of wheel/rail impact vibrations due to non-roundness of railway wheels are investigated in high-speed railway operation. The relationship between the range for acceptable roundness values and vehicle speed is determined. Finally, the view that it is of important significance to establish wheel/rail force real-time monitoring system is expanded, so that abnormal conditions caused by out-of-round wheels can be detected in time, to ensure high-speed railway traffic safety. The study is very important for enhancing the stability and economy signification of rail transmission.

Download Full-text

Monitoring Strategic Hydraulic Infrastructures by Brillouin Distributed Fiber Optic Sensors

Water ◽

10.3390/w14020188 ◽

2022 ◽

Vol 14 (2) ◽

pp. 188

Author(s):

Manuel Bertulessi ◽

Daniele Fabrizio Bignami ◽

Ilaria Boschini ◽

Marco Brunero ◽

Maddalena Ferrario ◽

...

Keyword(s):

Fiber Optic ◽

Fiber Optic Sensors ◽

Strain Gauges ◽

Mountain Valley ◽

Concrete Members ◽

Strain Monitoring ◽

Hydropower Plants ◽

Complex Structural ◽

Monitoring Technologies

We present a case study of a Structural Health Monitoring (SHM) hybrid system based on Brillouin Distributed Fiber Optic Sensors (D-FOS), Vibrating Wire (VW) extensometers and temperature probes for an existing historical water penstock bridge positioned in a mountain valley in Valle d’Aosta Region, Northwestern Italy. We assessed Brillouin D-FOS performances for this kind of infrastructure, characterized by a complex structural layout and located in a harsh environment. A comparison with the more traditional strain monitoring technology offered by VW strain gauges was performed. The D-FOS strain cable has been bonded to the concrete members using a polyurethane-base adhesive, ensuring a rigid strain transfer. The raw data from all sensors are interpolated on a unique general timestamp with hourly resolution. Strain data from D-FOS and VW strain gauges are then corrected from temperature effects and compared. Considering the inherent differences between the two monitoring technologies, results show a good overall matching between strain time series collected by D-FOS and VW sensors. Brillouin D-FOS proves to be a good solution in terms of performance and economic investment for SHM systems on complex infrastructures such as hydropower plants, which involve extensive geometry combined with the need for detailed and continuous strain monitoring.

Download Full-text