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Inverse Identification of Cable Forces using its Modal Behavior by Direct and Non-Contact Vibration Measurements

Fritzsche, Max Johannes Alois ; Rupp, Maximilian Michael ; Lorenzen, Steven Robert ; Hofmann, Lucia ; Birmele, Lia ; Schneider, Jens (2023)
Inverse Identification of Cable Forces using its Modal Behavior by Direct and Non-Contact Vibration Measurements.
9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. Athen, Griechenland (12.06.2023-14.06.2023)
doi: 10.26083/tuprints-00024729
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Item Type: Conference or Workshop Item
Type of entry: Secondary publication
Title: Inverse Identification of Cable Forces using its Modal Behavior by Direct and Non-Contact Vibration Measurements
Language: German
Date: 27 October 2023
Place of Publication: Darmstadt
Year of primary publication: 2023
Book Title: Proceedings of the 9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
Collation: 15 Seiten
Event Title: 9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
Event Location: Athen, Griechenland
Event Dates: 12.06.2023-14.06.2023
DOI: 10.26083/tuprints-00024729
Origin: Secondary publication
Abstract:

Cables are essential in civil engineering for constructing slender, lightweight structures with large spans. To ensure serviceability and load-bearing capacity, a monitoring of the cable forces is necessary. Conventional, static methods are not suitable for systems with highly pre-stressed cables or large cable diameters, so dynamic measurements using the cable's vibration behavior offer an alternative. This study presents laboratory test results on inverse identification of cable forces using eigenmodes and the corresponding frequencies, comparing contact and non-contact dynamic measurement methods. Two methods for determining the cable force will be investigated within this study: (1) the linear theory of vibrating strings neglects internal sag and bending stiffness, and (2) an inverse identification of the cable force for a cable tensioned on both sides, accounting for bending stiffness. Contact based measurement with accelerometers can identify many eigenmodes and frequencies unambiguously and is suitable for simple systems like single span systems. In the conducted investigations, the non-contact measurement with microwave interferometers could only identify up to 4 natural frequencies. The study also examines the influence of the free vibration length, which, in addition to the bending stiffness of the cable, the fork fitting and utilization, has a significant influence on the determined cable forces. The implications for using different fork fittings and cable cross-sections are discussed. This study offers valuable insights into the challenges and limitations of cable force identification and highlights the importance of choosing the appropriate measurement method based on the design of the cable structure.

Uncontrolled Keywords: dynamic measurements, inverse identification, free vibration length, linear theory of vibrating strings, experimental determination of natural frequencies
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-247294
Classification DDC: 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
600 Technology, medicine, applied sciences > 624 Civil engineering and environmental protection engineering
600 Technology, medicine, applied sciences > 690 Building and construction
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institute für Structural Mechanics and Design > Structural Engineering and Dynamics of Structures (2024 renamed "Data-infused Modeling in Structural Dynamics")
13 Department of Civil and Environmental Engineering Sciences > Institute für Structural Mechanics and Design > Structural Engineering
Date Deposited: 27 Oct 2023 11:48
Last Modified: 16 Jan 2024 12:55
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/24729
PPN: 512752508
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