The Hong Kong Polytechnic University (PolyU) is collaborating with Southwest Jiaotong University and Dalian Jiaotung University to study the use of its proprietary Advanced Fiber Bragg Grating Sensor (FBG) Systems for monitoring the structural health and safety of the nation’s fast-expanding High-Speed Rail.
PolyU President Professor Timothy W. Tong and Vice President (Research Development) Professor Alex Wai have been recently invited to lead a delegation to join a test ride along the Beijing-Shanghai High-Speed Rail before its official opening. The delegation members included several Council Members, key researchers and student representatives. They were all impressed by the expedient services of the High-Speed Rail.
PolyU researchers and their mainland partners have already installed the “Advanced Fibre Bragg Grating Railway Monitoring System” in several parts of the high-speed rail across the country. The hundreds of optical sensors will provide information on vibration, acceleration and temperature change for engineering staff, helping them to monitor the condition of tracks and railcars as well as structural health of the rail foundation.
Professor Alex Wai, who is also Chair Professor of Optical Communications, said optical fibre technology has radically changed the way people communicate and its application has extended to a wide range of fields including sensing systems, life science, measuring and structural engineering The unique characteristics of optical fiber sensing technology offer many advantages that make them ideal for use in railway systems.
The University has already established a strong inter-departmental research team to study the use of optical fibre technology in different settings. Its key members include Professor Ho Siu-lau, Professor Tam Hwa-yau and Dr Michael Liu of the Department of Electrical Engineering; Professor Ni Yiqing and Professor Yan Jianhua of the Department of Civil and Structural Engineering; Professor Zhou Limin and Professor Cheng Li of the Department of Mechanical Engineering; and Dr Wang Dan of the Department of Computing.
In regard to monitoring track and trains, the team under Professor Ho Siu-lau and Professor Tam Hwa-yaw has already completed the installation of the “Advanced Fibre Bragg Grating Railway Monitoring System” in several important parts of the high-speed rail. The system now provides real-time data for analysis by engineering experts of PolyU. It can also keep track of train speed, axle balance and vibration data for record and further analysis. The system not only benefits the high-speed rail in operation, but also contributes to further research in this important area.
On the other hand, Professor Ni Yiqing, Co-ordinator for the University-wide Interdisciplinary Research on Railway-related Projects, has been working closely with Dalian Jiaotung University to install PolyU’s optical sensors on the new generation of high-speed inspection trains for monitoring purpose. The optical sensors for wind pressure measurement developed by the team have been successfully installed and used for this important pilot run.
At the same time, Professor Ni and Professor Yan Jianhua are collaborating with Southwest Jiaotung University to monitoring the settlement of rail foundation with the use of another kind of optical sensors. The study is important for understanding the safety of foundation and related changes. The team has also kicked off a project together with China CNR Corporation, Southwest Jiaotung University and Dalian Jiaotung University on the use of smart damping technology for enhancing the stability of high-speed trains.
PolyU will host the First International Workshop on High-Speed and Intercity Railways from 20 to 22 July in Shenzhen and Hong Kong. The workshop is co-organised with Southwest Jiaotung University, Beijing Jiaotung University, Dalian Jiaotung University, China Engineering Consultants, Inc. (Taiwan), Zhejiang University and Tsinghua University.
Over the years, the FBG technology developed by PolyU researchers has won international acclaim. In 2004, the FBG railway monitoring systems developed by Professor Tam Hwa-yaw won a Gold Award in the 32nd International Exhibition of Inventions held in Geneva. In the same year, the project of sensors and its application in the railway monitoring systems jointly developed by Professor HO Siu-lau and Professor Tam Hwa-yaw also won a Bronze Award in the 5th China International Invention Expo of Shanghai.
PolyU has a Smart Railway Research Laboratory on its campus. Under the headship of Professor HO Siu-lau, the lab focuses on the study and improvement of the railway operation and safety. PolyU researchers have also made concerted efforts to improve such technology and explore their use in different real-life settings.
Meanwhile, the research team at the Department of Mechanical Engineering will consolidate their experience and expertise in the area of structural health monitoring for use in the High-Speed Rail. Using ultrasonic wave technology, the team has already developed an instantaneous diagnosis system which can detect cracks arising from metallic fatigue and corrosion of key parts in the track and rail. This new technology can be also combined with the use of laser actuating/sensing technology for monitoring the structural health of bridges, tunnels, tracks, train bodies, bogie frames and wheel axles.
About FBG Sensors
The FBG sensors developed by PolyU are small periodic structures created inside the 10-µm core diameter of standard 125-µm thick optical fibers. The measurement information is encoded in the wavelength of the reflected light from the FBG’s. Wavelength is an absolute parameter and any changes in the received signal strength do not affect the sensing information, ensuring highly reliable sensing information. Another unique feature of the FBG sensing systems is that hundreds of FBG sensors along a single optical fiber as long as 100 km long can be utilized to measure many different parameters such as temperature, strain, vibration, acceleration, and inclination, replacing many different types of conventional sensing systems. These features greatly enhance the reliability of the FBG sensing systems which provide the industry a very cost-effective integrated solution.
While traditional electronic sensors require large space for instrumentation, EMI shielding and cabling to withstand electromagnetic interferences, FBG sensors are fabricated onto tiny optical fibers and not affected by external interferences and so can monitor points not reachable by electrical sensors. With the use of FBG sensors, many of the previously inaccessible points now become readily accessible. This cutting-edge technology has been used by PolyU in different large-scale projects. One of the recent applications is in the structural health monitoring of the 610-meter Guangzhou TV Tower, which is currently the tallest TV tower in the world.Press Contact:
Further reports about: > Advanced Investigator Grant > End User Development > FBG > Ferchau Engineering > Fiber Optic Cables > High-Speed > Mechanical Engineering > PolyU > Rail > Sensor > information technology > monitoring system > optical data > optical fiber > optical fibre > optical sensors > sensing technology
New players, standardization and digitalization for more rail freight transport
16.07.2018 | Fraunhofer-Institut für System- und Innovationsforschung (ISI)
A helping (Sens)Hand
11.04.2018 | Fraunhofer-Institut für Arbeitswirtschaft und Organisation IAO
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
Proteins must be folded correctly to fulfill their molecular functions in cells. Molecular assistants called chaperones help proteins exploit their inbuilt folding potential and reach the correct three-dimensional structure. Researchers at the Max Planck Institute of Biochemistry (MPIB) have demonstrated that actin, the most abundant protein in higher developed cells, does not have the inbuilt potential to fold and instead requires special assistance to fold into its active state. The chaperone TRiC uses a previously undescribed mechanism to perform actin folding. The study was recently published in the journal Cell.
Actin is the most abundant protein in highly developed cells and has diverse functions in processes like cell stabilization, cell division and muscle...
Scientists have discovered that the electrical resistance of a copper-oxide compound depends on the magnetic field in a very unusual way -- a finding that could help direct the search for materials that can perfectly conduct electricity at room temperatur
What happens when really powerful magnets--capable of producing magnetic fields nearly two million times stronger than Earth's--are applied to materials that...
The quality of materials often depends on the manufacturing process. In casting and welding, for example, the rate at which melts solidify and the resulting microstructure of the alloy is important. With metallic foams as well, it depends on exactly how the foaming process takes place. To understand these processes fully requires fast sensing capability. The fastest 3D tomographic images to date have now been achieved at the BESSY II X-ray source operated by the Helmholtz-Zentrum Berlin.
Dr. Francisco Garcia-Moreno and his team have designed a turntable that rotates ultra-stably about its axis at a constant rotational speed. This really depends...
08.08.2018 | Event News
27.07.2018 | Event News
25.07.2018 | Event News
14.08.2018 | Information Technology
14.08.2018 | Life Sciences
14.08.2018 | Life Sciences