Southwest Jiaotong University

Rong Chen

Kai Liu

Ping Wang

Min Xue

Zijun Cao

Hui Peng

Tao Lv

Xuetong Wang

Jianxing Liu

Zhou Xu

Yiling Liu

Jingmang Xu

Jiayan Nie

Provided is a method of reconstructing and randomly generating three-dimensional profiles of railway ballast particles. The method focuses on two aspects of accurate characterization and random generation of the railway ballast profiles. The method specifically includes: first, obtaining a lot of railway ballast profile samples to form a railway ballast library, and describing the uncertainty of the railway ballasts as much as possible; introducing a spherical harmonic function method into the three-dimensional profile characterization of railway ballast particles in order to accurately reconstruct the railway ballast particle profiles; and finally, establishing a joint probability density function of a spherical harmonic function spectrum to randomly generate railway ballast particles.

Method of randomly generating three-dimensional profiles of railway ballast particles

The present invention relates to the technical field of maglev transportation, specifically revealing a method and apparatus for measuring magnetic field intensity in high-temperature superconducting maglev transportation systems. The method includes: Establishing the top surface of the permanent magnet guideway (PMG) as the reference datum for magnetic field intensity measurements; developing a multi-point chord measurement system with parameters including system sampling interval, system order, and chord measurement configuration; computing intermediate chord values; constructing an inversion model incorporating the least squares method and employing this model to derive the vertical displacement of the reference chord baseline; determining gap sensor locations and deploying an array of Hall effect sensors along the direction of magnetic field intensity measurement; adjusting the reference datum position; and calculating the magnetic field intensity distribution above the reference datum using interpolation techniques based on the Hall effect sensor array measurements.

Method and apparatus for measuring magnetic field intensity in high-temperature superconducting maglev transportation systems

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Chengdu, China

Rong Chen