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Hongwei Huang,Jiangyun Liu,Limin Sun 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.16 No.6
MR dampers have been proposed for the control of cable vibration of cable-stayed bridge in recent years due to their high performance and low energy consumption. However, the highly nonlinear feature of MR dampers makes them difficult to be designed with efficient semi-active control algorithms. Simulation study has previously been carried out on the cable-MR damper system using a semi-active control algorithm derived based on the universal design curve of dampers and a bilinear mechanical model of the MR damper. This paper aims to verify the effectiveness of the MR damper for mitigating cable vibration through a full-scale experimental test, using the same semi-active control strategy as in the simulation study. A long stay cable fabricated for a real bridge was set-up with the MR damper installed. The cable was excited under both free and forced vibrations. Different test scenarios were considered where the MR damper was tuned as passive damper with minimum or maximum input current, or the input current of the damper was changed according to the proposed semi-active control algorithm. The effectiveness of the MR damper for controlling the cable vibration was assessed through computing the damping ratio of the cable for free vibration and the root mean square value of acceleration of the cable for forced vibration.
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Study on the frequency of self-excited pulse jet
Wang, Jian,Li, Jiangyun,Guan, Kai,Ma, Tianyou Korean Society for Fluid machinery 2013 International journal of fluid machinery and syste Vol.6 No.4
Self-excited pulse jet is a specific nozzle with a closed chamber which can change a continuous jet into a pulse one. Energy of the pulse jet can be output not only unevenly but also with multifrequency. With the peak pressure of pulse jet, the hitting power would be 2~2.5 times higher than that of continuous jet. In order to reveal the correlation between the self-excited pulse frequency and nozzle diameter ratio, nozzle spacing and operating pressure, the model of 3D unsteady cavitation model has been used. We found that with the same nozzle structure parameters and the different operating pressure, the self-excited frequency and the width of peak crest are different, but the wave profiles are similar. With FFT, we also found that the less bandwidth of amplitude in low frequency range will lead to the wider wave crest of outlet velocity in its time domain, and the larger force of the strike will be gained. By studying the St of self-excite nozzle, not only the frequency of a certain nozzle can be predicted, but also a nozzle structure with a certain frequency can be designed.
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Liang Ning,Zhang Jiangyun,Zheng Feng,Pan Zhengnan 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.2
With the gradual increase in the proportion of renewable energy generation such as wind power, it is necessary to implement low-carbon transformation of thermal power units and fully exploit the capacity of industrial load demand response, so as to achieve carbon peak and carbon neutralization of energy and power. On this basis, a multi-time scale scheduling method considering typical industrial load production processes is proposed in this paper. Firstly, with regard to the source, a comprehensive fexible operation mode of carbon capture power plants is introduced to coordinate with wind power. In the aspect of the load, the production characteristics of two typical industrial users are specifcally considered, and the production models that meet their specifc constraints are established. Secondly, the day-ahead and intra-day two-stage economic dispatch model of source–load coordination is constructed so as to optimize the production plan of typical industrial load and the output of units, while improving the problem of load loss and wind curtailment. Finally, an example analysis is carried out. The results show that the scheduling method proposed in this paper can make use of the scheduling advantages of source–load adjustable resources to realize the economic dispatch of power system.
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Wang Yan,Wen Jun,Zheng Jiangyun,Deng Zhifeng,Zhou Yueyu,Jiang Guisheng,Xia Qiangsheng,He Enjie,Ning Lixin 한국물리학회 2021 Current Applied Physics Vol.26 No.-
Thermodynamic properties, electronic structures and spectroscopic properties of defects and Ce3+ in Y2O3 are studied by using the hybrid density functional theory associated with multi-reference configuration interaction ab-initio calculations. Thermodynamic transition energy levels of the easily generated oxygen vacancies in the host are analyzed according to HSE06-calculated formation energies, which may be conducive to interpretations of the persistent luminescence (PersL) of Y2O3-based phosphors. Besides, the locations of impurity states (caused by VO and Ce3+) in energy bands are obtained from derived density of states. Moreover, energies and oscillator strengths of 4f1 → 5d1 5 transitions of Ce3+ ions (at Y1 and Y2 sites) calculated from the CASSCF/CASPT2/ RASSI SO method agree reasonably well with experimental excitation spectra of Y2O3: Ce3+ phosphors, achieving the assignment of excitation spectra. The presented calculations can be applied to identify luminescent centers in Ce3+-doped phosphors and reveals possible native defects and their roles in the PersL of phosphors.
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