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| 1 | Bispectrum Feature Extraction of Gearbox Faults Based on Nonnegative Tucker3 Decomposition with 3D Calculations显示文摘Nonnegative Tucker3 decomposition(NTD) has attracted lots of attentions for its good performance in 3D data array analysis. However, further research is still necessary to solve the problems of overfitting and slow convergence under the anharmonic vibration circumstance occurred in the field of mechanical fault diagnosis. To decompose a large-scale tensor and extract available bispectrum feature, a method of conjugating Choi-Williams kernel function with Gauss-Newton Cartesian product based on nonnegative Tucker3 decomposition(NTD_EDF) is investigated. The complexity of the proposed method is reduced from(nNlgn) in 3D spaces to 12 o(R1R2nlgn)in 1D vectors due to its low rank form of the Tucker-product convolution. Meanwhile, a simultaneously updating algorithm is given to overcome the overfitting, slow convergence and low efficiency existing in the conventional one-by-one updating algorithm. Furthermore, the technique of spectral phase analysis for quadratic coupling estimation is used to explain the feature spectrum extracted from the gearbox fault data by the proposed method in detail. The simulated and experimental results show that the sparser and more inerratic feature distribution of basis images can be obtained with core tensor by the NTD_EDF method compared with the one by the other methods in bispectrum feature extraction, and a legible fault expression can also be performed by power spectral density(PSD) function. Besides, the deviations of successive relative error(DSRE) of NTD_EDF achieves 81.66 dB against 15.17 dB by beta-divergences based on NTD(NTD_Beta) and the time-cost of NTD_EDF is only 129.3 s, which is far less than 1747.9 s by hierarchical alternative least square based on NTD(NTD_HALS). The NTD_EDF method proposed not only avoids the data overfitting and improves the computation efficiency but also can be used to extract more inerratic and sparser bispectrum features of the gearbox fault. | WANG Haijun XU Feiyun ZHAO Jun’ai JIA Minping HU Jianzhong HUANG Peng | 2013 | Chinese Journal of Mechanical Engineering2013，26，6： | 2 |
| 2 | Growth and magneto-optical properties of NaTb ( WO4 ) 2 显示文摘 | Jingjing Liu Feiyun Guo Bin Zhao | 2008 | Journal of Crystal Growth2008，310，： | 1 |
| 3 | Nonlinear dynamic analysis on rigid-flexible coupling system of an elastic beam显示文摘Previous work examined the effect of the attached stiffness matrix terms on stability of an elastic beam undergoing prescribed large overall motion.The aim of the present work is to extend the nonlinear formulations to an elastic beam with free large overall motion.Based on initial stress method,the nonlinear coupling equations of elastic beams are obtained with free large overall motion and the attached stiffness matrix is derived by solving sub-static formulation.The angular velocity and the tip deformation of the elastic pendulum are calculated.The analytical results show that the simulation results of the present model are tabled and coincide with the one-order approximate model.It is shown that the simulation results accord with energy conservation principle. | Feiyun Zhao Jinyang Liu Jiazhen Hong | 2012 | Theoretical & Applied Mechanics Letters2012，2，2： | 1 |
| 4 | Surface Modification of Bamboo-based Activated Carbon for Methylene Blue Removal显示文摘The feasibility of biomass-based activated carbon has received tremendous attention owing to its excellent properties,such as insensitivity,good adsorption performance,and potential to reduce the strong dependence on non-reproducible precursors.In this study,bamboo-based activated carbon(BAC)was used as the raw material for methylene blue(MB)removal.Cetyltrimethylammonium bromide(CTAB),sodium dodecyl sulfate(SDS),and sodium dodecylbenzene sulfonate(SDBS)were used as BAC surface modifiers.The morphologies and structures of the samples were characterized.In addition,the effects of the surfactant type and concentration on the adsorption-based removal of MB from aqueous solutions by the modified BAC were systematically investigated.For the 0.2 g/L MB solution,the MB removal rate reached 99.7%when the concentration of CTAB was 0.25 g/L.Moreover,the kinetic model curve of 0.25 g/L CTAB-modified BAC(CAC)was consistent with the Freundlich isotherm model.This research work enriches the technical pathway of modification and application of activated carbon,which is not only beneficial for realizing the high-value utilization of biomass bamboo resources but also can play an active role in guiding the treatment of MB-containing wastewater. | Derong Tang Ruonan Zhao Feiyun Li Tianying Chen Yanjun Tang | 2023 | Paper And Biomaterials2023，8，1： | 0 |
| 5 | Geographical variation of the acoustic signals in the spot-legged treefrog (Polypedates megacephalus) of Hainan Island显示文摘Geographical divergence in acoustic signals is often affected by multiple selective pressures.Environmental factors are expected to shape signals by adjusting for greater propagation efficiency.Nevertheless,such habitat-driven hypotheses have not been well-examined with multi-signal and multi-habitat types included simultaneously.In this study,we evaluated call similarity of the spot-legged treefrog(Polypedates megacephalus),characterized by multiple call types,from 11 geographic populations across Hainan Island.We also examined multiple factors(i.e.body mass,temperature,altitude,and vegetation)among different acoustical geographic clusters,and tested whether the variation in acoustic length and frequency among different habitats was in accordance with the predic-tion derived from the acoustic adaptation hypothesis.We showed that P.megacephalus from Hainan Island included 3 acoustic geographic clusters:the northeasternflatlands,the southwest mountains,and the hills around the moun-tains.We also showed that environmental factors(i.e.altitude and vegetation)varied across these 3 acoustically distinct areas.Moreover,the duration of the different call types supported the hypothesis that they should have opti-mal transmission in their own habitats.Thus,our results reveal the roles of ecological selection in the geographical divergence of anuran acoustic signals. | Longhui ZHAO Qiucheng LIU Yuanyu QIN Xiaofei ZHAI Feiyun TU Tongliang WANG Jichao WANG | 2023 | Integrative Zoology2023，18，4： | 0 |
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