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오늘 본 자료
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Dynamaic Progressive Failure Analysis of Reinforced Small Embankment Dams by Kinematic Hardening Elasto-plastic Constitutive Model
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Current status of newborn screening worldwide: 2015
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레이저 프린터용 광스캔유닛(LSU)의 동특성 개선
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Ruminal digestion characteristics and effective degradability of cell wall of browse species from northeastern Mexico
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- 저자 : Chuan Song Wu (검색결과 3 건)
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He-chuan Song,Yi-du Zhang,Qiong Wu,Han-jun Gao 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.10
The 3-2-1 constraint principle has been widely applied as the boundary conditions for the finite element method (FEM) to simulate machining deformation of aerospace structure components. However, this principle is inconsistent with the actual contact surface between workpieces and worktables because it provides only three constraint points. These points have rarely been studied in terms of positions and distances. In addition, the applicability of the principle is limited for the workpiece with geometric centers difficult to find or centers without nodes. Therefore, this study proposed a new boundary condition method, low-stiffness spring element constraint method (SECM), drawing on FEM theories and related mechanic theories. With the method proposed this study established the FE model of machining deformation, and then compared the simulation results with both the analytical results and the experimental results of milling and deformation measurements. Good agreement is found between the three results. Finally, this study examined the effect of the three constraint points on simulation of the 3-2-1 principle in terms of point positions and distances. A comparison between SECM and the 3-2-1 principle revealed that SECM is closer to the actual working conditions and more reliable with wider application, which suggests that SECM can replace the 3-2-1 principle as the boundary conditions for the workpiece.
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Mudaser Ullah,Chuan Song Wu,Faisal Qayyum 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.8
Effect of solidification rate on crack tip plastic zone size at various crack lengths was calculated analytically and numerically by simplified Sih’s and Irwin’s models, respectively. Influence of plastic zone size is explained in terms of COD and elastic stress intensity factor within valid range of small scale yielding approximation. Up to plastic zone size range of 4-5 mm, a good agreement between numerical and analytical plastic zone size and elastic stress intensity factor for all weldments was observed. For high loads and greater crack lengths, experimentally obtained COD values were found 15-19 % more than simulation ones due to rapidly induced plasticity at high crack dimensions. Solidification rate showed a significant influence on FCPR, for solidification rates 13.75 °C/s, 6.97 °C/s and 4.32 °C/s the obtained fatigue strength was 35.29 MPa, 36.26 MPa and 41.32 MPa, respectively.
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Buck converter with switched capacitor charge compensation for fast transient response
Wanxin Zhou,Kezhu Song,Chuan Wu,Chengyang Zhu,Dongyi Xie 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.8
As microprocessor currents exceed 500 A and slew rate reaches 1000 A/μs, increasing the decoupling capacitance on the motherboard to ensure normal operation of the microprocessor is inevitable because of the limited response capability of the voltage regulator. However, the area of the motherboard used for capacitors is usually narrow. To reduce the required capacitance, a novel buck converter with an auxiliary circuit for charge compensation using switched capacitors is proposed. The auxiliary circuit is not activated during the steady state. When the load current changes rapidly, the switched capacitors can quickly absorb or release charge to suppress voltage fluctuations. A 12 V–0.9 V buck converter has been built and tested under a 480 A load current step and a 960 A/μs current slew rate. The proposed scheme with 9.964 mF capacitance has an overshoot of 115 mV and an undershoot of 89 mV. Compared with the conventional PID scheme, the proposed scheme can save 58.4% of the capacitance for the same voltage fluctuations or suppress 39.5% of overshoot and 37.3% of undershoot with the same capacitance.
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