scholarly journals MONITORING AND EVALUATION OF A LONG-SPAN RAIWAY BRIDGE USING SENTINEL-1 DATA

2017 ◽  
Vol IV-2/W4 ◽  
pp. 457-463 ◽  
Author(s):  
Q. Huang ◽  
M. Crosetto ◽  
O. Monserrat ◽  
B. Crippa
Keyword(s):  
Thermal Expansion ◽  
High Speed ◽  
Coefficient Of Thermal Expansion ◽  
Monitoring And Evaluation ◽  
Strongly Correlated ◽  
Persistent Scatterer Interferometry ◽  
Long Span ◽  
Persistent Scatterer ◽  
Key Aspects

This paper is focused on displacement monitoring of a bridge, which is one of the key aspects of its structural health monitoring. A simplified Persistent Scatterer Interferometry (PSI) approach is used to monitor the displacements of the Nanjing Dashengguan Yangtze River High-speed Railway Bridge (China). This bridge is 1272 m long and hosts a total of 6 railway lines. The analysis was based on a set of twenty-nine Sentinel-1A images, acquired from April 2015 to August 2016. A dense set of measurement points were selected on the bridge. The PSI results show a maximum longitudinal displacement of 150 mm, on each side of the bridge. The displacements are strongly correlated with the temperature, showing that they are due to thermal expansion. Using the PSI results, the Coefficient of Thermal Expansion (CTE) of the whole bridge was estimated. The result agrees well with the CTE of the bridge materials. Using a regression model, the PSI-measured displacements were compared with in-situ measurements. The paper proposes a procedure to assess the performance of the movable bearings of the bridge, which is based on the PSI measurements.

scholarly journals A Persistent Scatterer Interferometry Procedure Based on Stable Areas to Filter the Atmospheric Component

2018 ◽  
Vol 10 (11) ◽  
pp. 1780 ◽  
Author(s):  
Michele Crosetto ◽  
Núria Devanthéry ◽  
Oriol Monserrat ◽  
Anna Barra ◽  
María Cuevas-González ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Persistent Scatterer Interferometry ◽  
Phase Component ◽  
Atmospheric Component ◽  
Persistent Scatterer ◽  
Land Deformation ◽  
Original Part ◽  
Monitoring Area ◽  
Construction Works

This paper describes a Persistent Scatterer Interferometry (PSI) procedure to monitor the land deformation in an urban area induced by aquifer dewatering and the consequent drawdown of the water table. The procedure, based on Sentinel-1 data, is illustrated considering the construction works of Glories Square, Barcelona (Spain). The study covers a period from March 2015 to November 2017, which includes a dewatering event in spring 2017. This paper describes the proposed procedure, whose most original part includes the estimation of the atmospheric phase component using stable areas located in the vicinity of the monitoring area. The performances of the procedure are analysed, characterising the original atmospheric phase component and the residual one that remains after modelling the atmospheric contribution. This procedure can work with any type of deformation phenomena, provided that its spatial extension is sufficiently small. The quality of the obtained time series is illustrated discussing different deformation results, including a validation result using piezometric data and a thermal expansion case.

scholarly journals Measuring thermal expansion using X-band persistent scatterer interferometry

2015 ◽  
Vol 100 ◽  
pp. 84-91 ◽  
Author(s):  
Michele Crosetto ◽  
Oriol Monserrat ◽  
María Cuevas-González ◽  
Núria Devanthéry ◽  
Guido Luzi ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Persistent Scatterer Interferometry ◽  
Persistent Scatterer ◽  
X Band

scholarly journals In-situ alloying of AlSi10Mg+Si using Selective Laser Melting to control the coefficient of thermal expansion

2019 ◽  
Vol 795 ◽  
pp. 8-18 ◽  
Author(s):  
Theresa Hanemann ◽  
Luke N. Carter ◽  
Moritz Habschied ◽  
Nicholas J.E. Adkins ◽  
Moataz M. Attallah ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Selective Laser Melting ◽  
Coefficient Of Thermal Expansion ◽  
Laser Melting

Anisotropic Relaxation of Internal Forces in a Wound Reel of Magnetic Tape

1967 ◽  
Vol 34 (4) ◽  
pp. 888-894 ◽  
Author(s):  
H. Tramposch
Keyword(s):  
Surface Roughness ◽  
Thermal Expansion ◽  
Stress Distribution ◽  
Magnetic Tape ◽  
Digital Computer ◽  
High Speed ◽  
Coefficient Of Thermal Expansion ◽  
Internal Stresses ◽  
Numerical Examples ◽  
Internal Forces

Equations were developed to describe the relaxation of the internal stresses of a wound reel of magnetic tape, with allowances for the effects of surface roughness between tape layers and unequal thermal expansion of hub and tape-layer body. Numerical examples obtained with the aid of a high-speed digital computer indicated that the surface roughness as well as the unequal thermal expansion of hub and tape-layer body greatly affect the internal stress distribution. Essentially independent of the surface roughness, a typical reel, when stored at 120 F after being wound at 70 F and when the coefficient of thermal expansion of the hub is three times the value of the tape material, will approach stress-free conditions about 80 percent earlier than when it is stored at the winding temperature.

scholarly journals Subsidence activity maps derived from DInSAR data: Orihuela case study

2013 ◽  
Vol 1 (5) ◽  
pp. 5365-5402 ◽  
Author(s):  
M. P. Sanabria ◽  
C. Guardiola-Albert ◽  
R. Tomás ◽  
G. Herrera ◽  
A. Prieto ◽  
...  
Keyword(s):  
Limit State ◽  
Regional Scale ◽  
Forensic Analysis ◽  
Spatial Uncertainty ◽  
Angular Distortion ◽  
Persistent Scatterer Interferometry ◽  
Persistent Scatterer ◽  
Gaussian Simulation

Abstract. A new methodology is proposed to produce subsidence activity maps based on the geostatistical analysis of persistent scatterer interferometry (PSI) data. PSI displacement measurements are interpolated based on Conditional Gaussian Simulation (CGS) to calculate multiple equiprobable realizations of subsidence. The result from this process is a series of interpolated subsidence values, with an estimation of the spatial uncertainty and a confidence level on the interpolation. These maps complement the PSI displacement map, improving the identification of wide subsiding areas at regional scale. At local scale, they can be used to identify buildings susceptible to suffer subsidence related damages. In order to do so, it is necessary to calculate the maximum differential settlement and the maximum angular distortion for each building of the study area. Based on PSI derived parameters those buildings in which serviceability limit state has been exceeded, and where in situ forensic analysis should be made, can be automatically identified. This methodology has been tested in Orihuela City (SE Spain) for the study of historical buildings, damaged during the last two decades by subsidence due to aquifer overexploitation.

Materials Characterization and Model of PCB Thermal Expansion for Laminates With Various Copper Densities and Thicknesses

2004 ◽  
Author(s):  
William J. Cunningham ◽  
Dick Casali ◽  
Norman J. Armendariz
Keyword(s):  
Thermal Expansion ◽  
Thermal Management ◽  
High Speed ◽  
Printed Circuit Board ◽  
Coefficient Of Thermal Expansion ◽  
Materials Characterization ◽  
Circuit Board ◽  
Printed Circuit ◽  
Printed Circuit Board Manufacturing ◽  
Increasing Temperature

Abstract The SEMATECH/SEMI roadmap forecasts increased density requirements for printed circuit board manufacturing to accommodate smaller form factor interconnects, increased pin counts, and routing densities on a range of PCB sizes and thicknesses. As a result, the effect of materials. thermal expansion properties may further impact the structural or physical integrity and subsequent electrical properties for high speed and thermal management requirements. This study demonstrated that various sample coupons selected from PCB boards with different amounts of copper showed a corresponding coefficient of thermal expansion (CTE) correlation in the Z-axis (CTEZ) and can be modeled using a constitutive equation. Moreover, samples were further evaluated from the effect of increasing temperature and showed that the CTE indeed affects copper-interconnect physical structures such as copper vias and barrels in terms of elongation or strain.

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