Research on Time-Frequency Distribution Characteristics of the Straddle Monorail Train-bridge system and Indirect Identification of Bridge Frequencies
A time-frequency analysis framework for dynamic responses of a monorail train-bridge was established based on multibody dynamics and wavelet time-frequency theory to investigate the time-frequency distribution of the straddle monorail train-bridge system and indirect identification of bridge frequencies,and the accuracy of the result was validated through scaled model experiments.Through model construction and experimental validation,the following results can be obtained.The results indicate the following:Firstly,the established numerical model of the bridge-vehicle system exhibit good accuracy and can effectively simulate real-world conditions.Secondly,the wavelet analysis significantly improves the identification of low-order frequencies in both the lateral and vertical directions of the bridge,particularly exhibiting high accuracy in identifying the lateral and vertical fundamental frequencies.The lateral frequency identification is well-performed at lower train speeds,while there is an advantage in the identification of the vertical frequency at higher train speeds,and track irregularities mainly affect vertical frequencies.Finally,the fundamental frequency of the bridge can be obtained using the low-pass filtering method based on train acceleration responses.These results confirm the effectiveness of multibody dynamics and wavelet time-frequency analysis,which can be applied to the dynamic response analysis of straddle monorail train-bridges.Furthermore,the research on indirect bridge frequency identification provides an effective approach to indirectly identify bridge frequencies,contributing to a better understanding of the performance and safety of straddle monorail bridges in engineering practice.
straddle monorailsvehicle-bridge coupled vibrationwavelet analysistime-frequency distribution characteristicsbridge frequency
NETL
NSTL
万方数据
