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RECIPROCAL BEHAVIOR OF THE INBOUND GROUP TUORISTS IN TIBET
Li Hui,Yang Zhenzhi,Li Taohong,Shi Hong 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7
Based on the reciprocity theory, a dynamic reciprocal behavior model is verified by sampling the US and French group tourists in Tibet. Result shows that the US group tourists have only negative reciprocity, and French ones have both positive and negative reciprocity, indicating that tourists are more willing to sacrifice their interests to revenge hostile persons.
Research on On-Line Automatic Diagnostic Technology for Scratch Defect of Rolling Element Bearings
Yuxue Chen,Zhenzhi He,Shunian Yang 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
An on-line automatic diagnostic technology is presented in this paper, based on the simplified vibration model of early scratch defects of rolling element bearings and the analysis of vibration characteristics of early scratch defects. According to characteristics of periodic high frequency natural vibration excited by early scratch defects of the bearing, high frequency resonance technique (HFRT) is adopted for on-line diagnosing in the paper. An algorithm on peak detection of the vibrational energy is used to catch the main frequency of high frequency resonance automatically, denoising technology to improve the signal-to-noise ratio, and automatic identification technology to evaluate defect site of the tested bearing. An on-line automatic diagnostic system for early scratch defects of rolling element bearings, developed based on the above principles, can effectively identify early scratches on outer race, inner race and ball.
Failure analysis for hoisting wire ropes with local accumulated broken wire damage on the surface
Ping Zhou,Gongbo Zhou,Lianfeng Han,Xiaodong Yan,Hanyu Wang,Zhenzhi He 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.7
Surface broken wire (BW) damage to hoisting steel wire ropes (SWR) is unavoidable during the service process, and it continues to accumulate locally during the evolution process. The specific influence analysis of the surface damage with local cumulative BWs on the performance of the hoisting SWR is insufficient at present, which seriously affects the safety of the rope system. In this paper, a failure analysis method for the state of surface cumulative BW rope based on the integration of finite element (FE) and mechanical tension is proposed. First, a method for creating an FE model of surface BW damage is presented, and the stress-strain distribution features of damaged section under tensile load are revealed. Then, the residual mechanical strength of SWR under local cumulative BW damage is determined by performing a tensile test. Finally, based on the analysis of FE and breaking behavior, combined with the regulations, the state of the damaged SWR is comprehensively evaluated. The results show that the breaking position of the SWR under mechanical tension is the maximum stress distribution in the simulation analysis, which verifies the consistency between the simulation and the experiment; and the accumulation degree and distribution of local BW affect the residual mechanical strength of the SWR. This method explores the influence of different degrees of local BW damage on the mechanical properties of the SWR, which provides a direct basis for the non-destructive evaluation of the SWR state.
Wang Wei,Liang Xuanyu,Niu Qinghe,Wang Qizhi,Zhuo Jinyi,Su Xuebin,Zhou Genmao,Zhao Lixin,Yuan Wei,Chang Jiangfang,Zheng Yongxiang,Pan Jienan,Wang Zhenzhi,Ji Zhongmin 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.8
It is essential to evaluate the blasting-enhanced permeability (BEP) feasibility of a low-permeability sandstone-type uranium deposit. In this work, the mineral composition, reservoir physical properties and rock mechanical properties of samples from sandstone-type uranium deposits were first measured. Then, the reformability evaluation method was established by the analytic hierarchy process-entropy weight method (AHP-EWM) and the fuzzy mathematics method. Finally, evaluation results were verified by the split Hopkinson Pressure Bar (SHPB) experiment and permeability test. Results show that medium sandstone, argillaceous sandstone and siltstone exhibit excellent reformability, followed by coarse sandstone and fine sandstone, while the reformability of sandy mudstone is poor and is not able to accept BEP reservoir stimulation. The permeability improvement and the distribution of damage fractures before and after the SHPB experiment confirm the correctness of evaluation results. This research provides a reformability evaluation method for the BEP of the low-permeability sandstone-type uranium deposit, which contributes to the selection of the appropriate regional and stratigraphic horizon of the BEP and the enhanced ISL of the low-permeability sandstone-type uranium deposit.