PD-SOVNet: A Physics-Driven Second-Order Vibration Operator Network for Estimating Wheel Polygonal Roughness from Axle-Box Vibrations. - Xiancheng Wang; Lin Wang; Rui Wang; Zhibo Zhang; Minghang Zhao; Xiaoheng Zhang; Zhongyue Tan; Kaitai Mao (CoRR, 2026)