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Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Analysis of Special Structure of Song-Style Second Grade Dovetail Tenon WANG Jianxing, GAO Ruxin, YANG Duan, HE Jiaxin Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 45-51.   DOI: 10.13438/j.cnki.jdzk.2021.03.008 Abstract （613）      PDF（pc） （3035KB）（143）       Knowledge map    Save To better analyze the mechanical properties of the dovetail tenon structure, a twofold line multi-parametric mechanical structure was established, and a mechanical analysis test suitable for wooden structures was carried out. Then, the corresponding dovetail joints were proposed based on the mechanical balance and a deformation coordination relationship formula. The above research results show that the deformation of the dovetail tenon is mainly concentrated around the contact between the tenon and mouth. When the unidirectional load becomes larger, its bending moment also becomes larger, which is easy to cause damage to the contact surface. The load-displacement curve and the ultimate load-vertical load curve obtained through the test also show that when the vertical load increases, the ultimate load also increases; when the ultimate load reaches the yield critical point, the increase in displacement becomes smaller and tends to be smooth. Reference | Related Articles | Metrics | Comments（0） Select Application of Monte Carlo Algorithm in Heat Transfer Model of Protective Clothing LIU Qianlan, LEI Yihui, XIAO Yujiang, DONG Yaling Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 52-56.   DOI: 10.13438/j.cnki.jdzk.2021.03.009 Abstract （776）      PDF（pc） （590KB）（236）       Knowledge map    Save Accurate establishment  scientific heat transfer model for thermal protective clothing can reduce the costs and shorten the cycle of research and development. Therefore, a preliminary temperature distribution model is established based on  heat conduction principles, and Fourier's law and is modified by retardation factors  with controlling parameters. Monte Carlo algorithm is then applied to obtain the relevant parameters in the temperature distribution model according to the experimental data.Finally, an excellent heat transfer model of protective clothing is obtained. Reference | Related Articles | Metrics | Comments（0） Select Control Strategy of Variable Frequency Speed Regulation System Based on Multi-Drive HU Xiaofeng Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 57-62.   DOI: 10.13438/j.cnki.jdzk.2021.03.010 Abstract （612）      PDF（pc） （2959KB）（214）       Knowledge map    Save This paper presents a multi drive variable frequency speed control system. The topology of the system is AC-DC-AC structure, and the control performance is AC-AC direct conversion. Zero current commutation strategy and PWM control strategy can get good input current and output voltage waveform, and realize safe commutation. In the following, the correctness of the theory proposed in this paper is proved by the simulation results. Reference | Related Articles | Metrics | Comments（0）