重载货车过岔时重车重心高度技术条件优化OA

The current technical specifications for the center-of-gravity(COG)height of heavy-haul freight wagons during lateral passage through turnout diverging routes on China's railways remain anchored to speed-limit criteria established several decades ago-criteria that are increasingly misaligned with the operational demands of modern high-capacity freight networks.To bridge this gap,this study integrates experimentally measured wire rope tensile forces obtained from JHPY-type tension load cells to explicitly characterize the cargo-vehicle coupling interaction.A refined cargo-vehicle-turnout coupled dynamics model is then developed,incorporating cargo-induced vibration effects on system-level dynamic responses.This advancement enables more accurate assessment of lateral running safety for wagons with varying COG heights when traversing turnout diverging routes.Based on the model,a parametric sensitivity analysis is conducted across five critical factors:wagon type,track geometry and stiffness,cargo loading configuration,crosswind intensity,and operating speed.The most adverse combination of these parameters is identified,and a targeted simulation-based experimental scheme is formulated to evaluate the lateral passage safety of wagons negotiating the No.9 single-slip turnout under diverse COG height conditions.Through simulation,the suggestions for optimizing the technical specifications of the turnout lateral passage speed limits of heavy-haul freight wagons are proposed when the COG height is under and above the limit respectively.Results show that:unrestricted turnout lateral passage speed is deemed safe for the COG height h≤2 300 mm;for 2 300<h≤2 400 mm,2 400<h≤2 600 mm,and 2 600<h≤3 000 mm,the recommended maximum lateral passage speeds are 25 km·h-1,20 km·h-1,and 15 km·h-1,respectively.Relative to the existing regulation-which imposes a uniform 15 km·h-1 limit for all wagons with h>2 000 mm-the proposed framework raises the unrestricted-COG threshold from 2 000 to 2 300 mm and refines the speed limits for cases exceeding the limit into different levels.