Dynamic analysis of cross brace anti-warp stiffness performance for heavy haul freight wagon

A dynamic model was developed to assess the impact of cross braces on the lateral stability and curve navigability of heavy haul freight wagons. Simulations evaluated the dynamic performance of empty and loaded wagons under varying cross-brace anti-warp stiffness. The study focused on stability, ride quality during straight-line travel and safety indices across different curve radii. The results show that cross braces significantly enhance vehicle nonlinear critical speed. In straight-line sections, variations in anti-warp stiffness have a minimal impact on vertical ride quality but improve lateral ride quality. In curved sections, stiffness changes have little impact on derailment coefficient, wheel load reduction rate and attack angle but notably affect wheelset lateral force and wear index. Safety and ride quality indices decrease with increasing vehicle speed, while the impact on vertical indices remains minimal. As the curve radius increases, safety indices decrease. Significant changes in attack angle and derailment coefficient are observed when the curve radius shifts from R400 to R600. The study confirms that larger bolt preloads increase anti-warp stiffness while larger mounting angles decrease it. Selecting the appropriate bolt preload and cross-brace angle is crucial for optimising performance and safety in vehicle engineering applications.