Contact force identification in pantograph–catenary system via elastic support beam theory and enhanced l1 sparse regularization scheme (opens in new tab)

Accurate identification of pantograph–catenary contact force remains a challenging inverse problem, particularly under high-speed operating conditions where high-frequency dynamics play a critical role. Most existing contact force identification methods are primarily limited to low-frequency ranges (typically below 20 Hz), which restricts their applicability in analyzing high-frequency phenomena such as contact strip abnormal wear and fatigue crack initiation in pantograph structures. To over...