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12 results on '"Ma, Guangsong"'

1. The experimental and theoretical study on the spatial‐temporal distribution of electromagnetic radiation from JO‐8 explosions.

Author

Xu, Pengzhao, Zhao, Ning, Chang, Yukun, Cui, Shaokang, Ma, Guangsong, Shi, Kunlin, and Zhang, Bao

Subjects
ELECTROMAGNETIC radiation, ELECTROMAGNETIC theory, ELECTROMAGNETIC interference, COMPUTATIONAL electromagnetics, SHAPED charges, ELECTRIC fields, EXPLOSIONS
Abstract

The detonating fuse in the multistage warhead will be subjected to strong electromagnetic interference, derived from electromagnetic radiation generated by explosion of the shaped charge warhead, which may cause premature detonation or misfire. In order to explore the possible electromagnetic environment surrounded the detonating fuse, the spatial‐temporal distribution of electromagnetic radiation after the explosion of JO‐8 explosive was investigated in this paper. The electromagnetic radiation signal was collected and its frequency coverage was analyzed in the far‐field area by the field blast test. Moreover, based on electromagnetic theory, a theoretical model of electromagnetic radiation generated by the explosion of JO‐8 explosive was established, and the spatial‐temporal distribution of the electric field intensity was illustrated in detail for several typical positions after the explosion. The better agreement between experimental and theoretical results indicates that the proposed theoretical model and computational method are reasonable. On this basis, the distributions of electric field intensity for different positions and various explosive weights were predicted respectively by using distance and explosive weight as variables. This study is expected to provide a reference for the research on the electromagnetic radiation for explosive explosion and anti‐explosive electromagnetic interference. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Research on natural frequency based on modal test for high speed vehicles.

Author

Ma, Guangsong, He, Guanglin, Guo, Yachao, Liu, Lin, Yang, Can, and Ke, Jianfeng

Subjects
*MOTOR vehicle vibration, *HIGH-speed aeronautics, *FREQUENCY response, *PARAMETER identification, *MODAL assurance criterion
Abstract

High speed vehicle as a vibration system, resonance generated in flight may be harmful to high speed vehicles. It is possible to solve the resonance problem by acquiring the natural frequency of the high-speed aircraft and then taking some measures to avoid the natural frequency of the high speed vehicle. Therefore, In this paper, the modal test of the high speed vehicle was carried out by using the running hammer method and the PolyMAX modal parameter identification method. Firstly, the total frequency response function, coherence function of the high speed vehicle are obtained by the running hammer stimulation test, and through the modal assurance criterion (MAC) to determine the accuracy of the estimated parameters. Secondly, the first three order frequencies, the pole steady state diagram of the high speed vehicles is obtained by the PolyMAX modal parameter identification method. At last, the natural frequency of the vibration system was accurately obtained by the running hammer method. [ABSTRACT FROM AUTHOR]

Published
2018
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