Method for automatically detecting free vibration response of high-speed railway bridge for modal identification
US11221273B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2019 |
| Grant date | Jan 11, 2022 |
| Priority date | — |
| Expiry date | Mar 26, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M7/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for automatically detecting the free vibration response segment of the high-speed railway bridges after trains passing. First, pre-select the test response sequence to be decomposed based on the maximum of the time instants corresponding to the absolute maximums of the response vectors at various measuring point. Then, Extract the single-frequency modal response from the test response by the iterative variational mode decomposition and fit the envelope amplitude of the modal response by Hilbert transform. Finally, the vibration features at each time instants are marked as decay vibration or non-decay vibration. The longest structural response segment that meets the decay vibration features is determined as the detected free vibration response segment for modal identification. This invention can effectively detect the free vibration data segment without human participation, which is of great significance for the real-time accurate modal analysis of high-speed railway bridges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.