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RISS 인기검색어
- 검색키워드
- 저자 : Jinjia Wei (검색결과 3 건)
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Optimized inverse distance weighted interpolation algorithm for γ radiation field reconstruction
Zhang Biao,Cao Jinjia,Lin Shuang,Li Xiaomeng,Zhang Yulong,Zheng Xiaochang,Chen Wei,Song Yingming 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.1
The inversion of radiation field distribution is of great significance in the decommissioning sites of nuclear facilities. However, the radiation fields often contain multiple mixtures of radionuclides, making the inversion extremely difficult and posing a huge challenge. Many radiation field reconstruction methods, such as Kriging algorithm and neural network, can not solve this problem perfectly. To address this issue, this paper proposes an optimized inverse distance weighted (IDW) interpolation algorithm for reconstructing the gamma radiation field. The algorithm corrects the difference between the experimental and simulated scenarios, and the data is preprocessed with normalization to improve accuracy. The experiment involves setting up gamma radiation fields of three Co-60 radioactive sources and verifying them by using the optimized IDW algorithm. The results show that the mean absolute percentage error (MAPE) of the reconstruction result obtained by using the optimized IDW algorithm is 16.0%, which is significantly better than the results obtained by using the Kriging method. Importantly, the optimized IDW algorithm is suitable for radiation scenarios with multiple radioactive sources, providing an effective method for obtaining radiation field distribution in nuclear facility decommissioning engineering.
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Zhang Yulong,Cao Jinjia,Zhang Biao,Zheng Xiaochang,Chen Wei 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.7
Accurate reconstruction of radiation field and path planning are very important for the safety of operators in the process of dismantling nuclear facilities. Based on radial basis function (RBF) interpolation algorithm, this paper discussed the application of inverse multiquadric radial basis Function (IMRBF) interpolation method to the reconstruction of gamma radiation field, and proved the feasibility of reconstructing a radiation field with multiple γ sources. The average relative errors of IMRBF interpolation results were 4.28% and 8.76%, respectively, for the experimental scenarios with single and double gamma sources. After comparing the consistency between the simulated scene and the experimental scene, IMRBF method and Cubic Spline method were respectively used to reconstruct the gamma radiation field by Geant4 simulation data. The results showed that the interpolation accuracy of IMRBF method was superior to that of Cubic Spline method. Further, more RBF interpolation algorithms were used to reconstruct the multi-γ source radiation field, and then the Probabilistic Roadmap (PRM) algorithm was used to optimize the human walking path in the radiation field reconstructed by different interpolation methods. The optimal paths in radiation fields generated by multiple interpolation methods were compared. The results herein contribute to a comprehensive understanding of RBF interpolation methods in reconstructing γ radiation fields and their application in optimizing paths in radiation environments. The insights may provide valuable information for decision-making in radiation protection during the decommissioning of nuclear facilities.
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Aerodynamic and acoustic behavior of a finite span wing equipped with synthetic jet actuator
Mohammad Moshfeghi,Hanru Liu,Yonghui Xie,Jinjia Wei,Nahmkeon Hur 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In the current paper, aerodynamic and acoustic behaviors of a finite span wing with a synthetic jet actuator (SJA) are investigated using the DES turbulence model at three different angles of attack (AOA=14°, 18° and 25°). Aerodynamically, the main role of the SJA actuator is causing the vortex breakdown, weakening the separation effects and generating aerodynamic forces which fluctuate in time. As the AOA increases, the separated area becomes larger and stronger and, hence, the lift and drag values turns from the harmonic shapes to irregular fluctuation. From the acoustic point of view, for the AOAs of 14° and 18° the sound source occurs near the trailing edge. However, at AOA=25°, the dominant frequency of sound spectrum tends to move to a low frequency and the overall sound pressure level becomes the highest. Also, for this AOA the sound emits from both trailing edge and leading edge. Moreover, it is observed that the sound directivity changes to a no-dipole shape at a frequency lower than that of AOA=14° and 18°.
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