Determination of Stay-Cable Forces Using Highly Mobile Vibration Measurement Devices

2018 ◽  
Vol 23 (2) ◽  
pp. 04017136 ◽  
Author(s):  
Guido Morgenthal ◽  
Sebastian Rau ◽  
Jakob Taraben ◽  
Tajammal Abbas
Keyword(s):  
Vibration Measurement ◽  
Stay Cable ◽  
Measurement Devices ◽  
Cable Forces

An integrated solution for tension monitoring in bridge hangers and stay cable by means of vibration measurement

2021 ◽  
Author(s):  
Thierry Auguste ◽  
Patrice Toussaint ◽  
Vincent Denoël ◽  
Margaux Geuzaine ◽  
Christophe Rutten ◽  
...  
Keyword(s):  
Vibration Measurement ◽  
Stay Cable ◽  
Taut String ◽  
Long Time ◽  
Bridge Cable ◽  
The University ◽  
A Company ◽  
Walloon Region ◽  
Over Time

<p>The determination of tension in bridge cables by means of vibration measurements has been used by the Direction of civil engineering expertise for decades to monitor the bridges managed by the Walloon Region (SPW). Over time, it has appeared that the traditional methodology, based on sparse on-site measurement and the taut string theory, suffers from certain limitations: the two most important are the delay between measurements (at best once a year) and the difficulties in solving the equation linking the vibration response to the tension in the stay, in the case of short or geometrically complex cable.</p><p>An agreement was concluded between the SPW, the University of Liège and V2i, a company specialised in vibrations, to develop a solution including a software allowing the tension determination in any kind of bridge cable and the hardware to monitor the cable tension remotely for a long time.</p><p><br clear="none"/></p>

scholarly journals Determination of beam characteristics by its vibration measurement

1995 ◽  
Vol 17 (3) ◽  
pp. 27-38
Author(s):  
Nguyen Cao Menh ◽  
Tran Trong Toan
Keyword(s):  
Inverse Problem ◽  
Analytical Method ◽  
Transverse Vibration ◽  
Vibration Measurement ◽  
Computational Program ◽  
Beam Characteristics ◽  
Free Beam

On the basis of analyzing the transverse vibration of a clamped-free beam, in this paper an inverse problem is investigated. The analytical method· and computational program me have been presented for determination of the length of the beam when vibrations at some points on the beam with external distribution excitation or vibration at one point with some excited frequencies are measured. The obtained results from the illustration examples described in the paper give us the procedure for selecting one solution in multi-solution inverse problem.

Dielectric Measurement Of Multi-Layered Medium Using An Open-Ended Waveguide

1996 ◽  
Vol 430 ◽  
Author(s):  
O. Tantot ◽  
M. Chatard-Moulin ◽  
P. Guillon
Keyword(s):  
Reflection Coefficient ◽  
Complex Permittivity ◽  
Layered Medium ◽  
Circular Waveguide ◽  
Air Gap ◽  
Dielectric Measurement ◽  
Microwave Measurement ◽  
Measurement Devices

AbstractThe use of a circular waveguide radiating into a multi-layered media allows the characterization of heterogeneous and fluid subtances. Many microwave measurement devices, based on reflection coefficient measurements, are subjected to air gap problems that introduce some inaccuracy in the determination of the unknown complex permittivity of the materials. Our purpose is to try and take the air gap into account in these measurements.

THE ROLE OF MOTION MONITORING IN EXPERIMENTS ON SLIDING FRICTION IN FLAT-ON-FLAT METALLIC CONTACTS

Tribologia ◽  
2017 ◽  
Vol 276 (6) ◽  
pp. 39-44
Author(s):  
Jacek ŁUBIŃSKI
Keyword(s):  
Sliding Friction ◽  
Screening Method ◽  
Vibration Signal ◽  
Analysis Data ◽  
Vibration Measurement ◽  
Global Evaluation ◽  
Data Set ◽  
Metallic Contacts ◽  
Critical Components

The paper describes an example of an experiment on sliding friction of metallic materials in which vibration measurement methods were used to identify friction induced vibrations occurring in sliding. The determination of the parameters of the motion of the critical components in the sliding system in different modes of operation allowed using the vibration signal as a source of information pertaining to the observed process. The tests performed with a metallic material were inspired by the earlier research performed with machine ceramics in which the result of vibration analysis allowed the determination of the correctness of measurement with regard to the conditions of contact and the analyses of the nature of the observed effect of vibration on the inflicted friction. The motion analysis data was used as a basis for a screening method eliminating corrupted measurements from the data set used for global evaluation of the friction characteristics. It was confirmed that, in a steel-on-steel sliding system, similar friction and vibration regimes occur as in ceramics-on-ceramics, but the effects of certain vibration modes are opposite in the two systems, despite the same load/velocity conditions.

On the Evaluation of Dynamic Stresses in Pipelines Using Limited Vibration Measurements and FEA in the Time Domain

1999 ◽  
Vol 121 (1) ◽  
pp. 37-41 ◽  
Author(s):  
W. A. Moussa ◽  
A. N. AbdelHamid
Keyword(s):  
Time Domain ◽  
Minimum Distance ◽  
Exciting Force ◽  
Vibration Measurement ◽  
Dynamic Stresses ◽  
Vibration Measurements ◽  
Pipe Model ◽  
Related Risk ◽  
The Time Domain

A practical technique is investigated for the determination of dynamic stresses in pipelines through the use of finite element method (FEM) and field measurement vibrations at selected points. Numerical simulation of a randomly loaded pipeline structure is used to establish the validity of the technique in the time domain. The analysis is carried out for a fixed-hinged pipe model. The results show that lack of coincidence between the vibration measurement points (VMPs) and the exciting force, or the use of only translational vibration measurements (TVMs) produce an approximate stress picture. The extent of the “error” in these cases is found to depend on the density of the VMPs and the proximity between these points and the exciting force location. A safety-related risk assessment is applied to find the minimum distance between measuring points that is needed to meet design codes reliability specifications.

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