Research on Modal Enhancement of EMU Vehicle Carbody Structure Based on Sensitivity Analysis
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 5
Abstract
Objective To comprehensively understand the influence of carbody component dimensions on carbody modal characteristics, a sensitivity analysis of EMU (electric multiple units) body modal is conducted to enhance the main vibration frequency of carbody. Method Based on sensitivity calculation results, eight univariate thickness enhancement schemes are developed for comparison analysis of the main carbody modal. Subsequently, by pairing up components with the greatest impact on major vibration modal, three enhancement schemes are formulated to investigate the effects of multivariate thickness vibrations on the main carbody vibration modal while minimizing mass increase. Result & Conclusion The thickness of side top plates, circular top plates, side wall panels, side wall beams/columns, roof bending beams, corrugated floors and chassis edge beams exhibits high sensitivity to the main carbody vibration modal. Increasing the thickness of these univariate and multivariate influencing factors results in a noticeable improvement in the main carbody vibration modal frequencies compared to the original structure. Compared to the scheme of univariate thickness influencing factors, the impact of multivariate thickness enhancement schemes on individual vibration modal frequencies shows a slight increase. However, its smaller amplitude variations are significantly lower than the stacked effects of two individual unicarite thickness factors on the carbody modal.
Authors and Affiliations
Yanpin DU, Ping LIAO, Jingzhong ZHAO, Zhipeng XU
Earth Chamber Pressure Prediction Method for Earth Pressure Balance Shield Based on LSTM-DNN Fusion Model
[Objective] Earth chamber pressure is a key parameter for EPB (earth pressure balance) shield construction assessment. Accurate prediction of earth chamber pressure helps construction technicians take timely control me...
Analysis and Application of Stratum Support Stress Under Action of Foundation Pit Retaining Pile
[Objective] Foundation pit retaining piles play a vital role in building construction. In order to ensure the safety and stability of foundation pit construction, it is necessary to make in-depth study on the stress dist...
Research on the Train Surface Pressure Characteristics in Passing through Tunnels at Speeds of 400 km/h and above
[Objective] In order to ensure the running safety of trains with a speed of 400 km/h and above when passing through tunnels and improve the passenger ride comfort, it is necessary to adopt the numerical simulation meth...
Development of Automatic Calculation Program for Passenger Flow Assignment in Urban Rail Transit Network Based on VISUM
[Objective] In view of the much repetitive work in the calculation process of passenger flow assignment in urban rail transit network, an automatic calculation program is developed on the basis of the research on the pas...
Prediction of Excavation Disturbance and Required Support Force for Tunnel beneath Existing Structural Foundations
[Objective] It is inevitable that construction of new tunnels or other underground engineering projects will pass through some building structures, causing disturbances to the existing structural foundations. Therefore,...