A novel asymptotic linear method for micro-pressure wave mitigation at high-speed maglev tunnel exit: A case study with various open ratios on tunnel hoods

• A novel asymptotic linear method (ALM) is proposed to mitigate micro-pressure waves by achieving a constant gradient of the initial compression wave. • The MPW amplitude initially decreases and then rises with increasing tunnel hood open ratio, with an optimal open ratio of 2.28%. • The ALM reduces MPW amplitude by 26.9% at 20 m and 20.0% at 50 m from the tunnel exit compared with an unvented hood. • The method enables rapid determination of the upper mitigation limit and supports adaptive design of tunnel hoods for high-speed maglev operations.