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Damage evaluation and prediction of steel box structures under internal blast
Shujian Yao,Zhifu Wang,Duo Zhang,Fangyun Lu,Nan Zhao,Yanjing Wang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
In this study, a rapid prediction method for the damage range evaluation of steel box structures under internal blast load was proposed. First, we carried out a dimensional analysis of the damage range, determined the main influencing factors, and built a predictive model. Then, a large number of numerical simulations were conducted with consideration of different steel grades, structural dimensions, plate thicknesses, and explosive weights. After that, according to the damage range data for all the working conditions obtained with the simulation, the failure mode diagrams were drawn on a dimensionless coordinate axis and a twodimensional dimensionless number coordinate system. Based on this, the damage range for different working conditions was observed, and empirical equations were proposed to quickly predict the damage range of the steel box structure during a blast load. Finally, the correctness of the proposed quick prediction method was verified through field blast experiments result.
Gangui Yan,Shuangming Duan,Shujian Zhao,Gen Li,Wei Wu,Hongbo Li 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.6
In order to solve the neutral-point voltage fluctuation problem of three-phase three-level T-type inverters (TPTLTIs), the unbalance characteristics of capacitor voltages under different switching states and the mechanism of neutral-point voltage fluctuation are revealed. Based on the mathematical model of a TPTLTI, a feed-forward voltage balancing control strategy of DC-link capacitor voltages error is proposed. The strategy generates a DC bias voltage using a capacitor voltage loop with a proportional integral (PI) controller. The proposed strategy can suppress the neutral-point voltage fluctuation effectively and improve the quality of output currents. The correctness of the theoretical analysis is verified through simulations. An experimental prototype of a TPTLTI based on Digital Signal Processor (DSP) is built. The feasibility and effectiveness of the proposed strategy is verified through experiment. The results from simulations and experiment match very well.
Yan, Gangui,Duan, Shuangming,Zhao, Shujian,Li, Gen,Wu, Wei,Li, Hongbo The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.6
In order to solve the neutral-point voltage fluctuation problem of three-phase three-level T-type inverters (TPTLTIs), the unbalance characteristics of capacitor voltages under different switching states and the mechanism of neutral-point voltage fluctuation are revealed. Based on the mathematical model of a TPTLTI, a feed-forward voltage balancing control strategy of DC-link capacitor voltages error is proposed. The strategy generates a DC bias voltage using a capacitor voltage loop with a proportional integral (PI) controller. The proposed strategy can suppress the neutral-point voltage fluctuation effectively and improve the quality of output currents. The correctness of the theoretical analysis is verified through simulations. An experimental prototype of a TPTLTI based on Digital Signal Processor (DSP) is built. The feasibility and effectiveness of the proposed strategy is verified through experiment. The results from simulations and experiment match very well.