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Guizhong Tian,Zhengyu Ma,Donghao Zhao,Honggen Zhou,Xuwen Jing,Zhancheng Xie,Guochao Li 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.6
The residual stresses (RS) generated during the thermal processing processes such as casting and heat treatment is one of the fundamental causes of irreversible deformation of diesel engine bodies (DEBs). However, previous studies only focused on the RS generated from casting or the effect of annealing heat treatment on the RS in castings unilaterally, and the analytical results were far from the actual conditions. Therefore, this paper proposes a comprehensive research method to consider the whole dynamic evolution of the casting from the RS generated by casting to the stress relief by heat treatment. Numerical simulation of DEBs casting process is carried out by PROCAST, and the results of casting RS obtained from the simulation are imported into ABAQUS, and then numerical simulation of annealing heat treatment is carried out for the DEB casting model with casting RS, so as to realize the analysis of dynamic evolution of RS from casting to heat treatment.
Guizhong Xie,Shixin Zhang,Hao Li,Liangwen Wang,Wenliao Du,Chongmao Zhao,Hangqi Jia 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
A double-layer optimization method for the forging process parameters of a hinge beam structure and the design of intermediate billet structure is proposed. First, a primary optimization system for the forging process parameters of hinge beam was established based on orthogonal experiments and range analysis method, and the optimal combination of forging process parameters was selected. On this basis, a mathematical model of the secondary optimization of the final forging of the hinge beam was established. Through radial basis function (RBF) agent model and multi-island genetic algorithm, the secondary optimization of intermediate billet structure of hinge beam was carried out, which improved the grain refinement degree of final forging and reduced the forming load required for forging. Through numerical simulation and optimization design of forging process, the quality and performance of final forging of hinge beam were improved, which has certain guiding significance for the actual production of hinge beam.
Fengjiang Wu,Guizhong Wang,Xiaoguang Li 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper, a novel triple phase-shift (NTPS) modulation is proposed first to eliminate the dual-side circulating currents of isolated dual-active bridge DC-DC converter. Furthermore, the current stress of the proposed NTPS control when the phase shift is tuned in two regions is derived and compared with each other and the best tuning region of the phase shift is determined to achieve the optimal current characteristics. The steady-state and transient performance of two implementation methods of NTPS control are discussed and the better one is determined. The corresponding experimental results of the proposed NTPS control validate its accuracy and validity.
Verruciform Xanthoma of the Penis
Tongli Xia,Guizhong Li,전인선,Yanqun,Na Yinglu Guo,정문기 대한비뇨의학회 2004 Investigative and Clinical Urology Vol.45 No.3
Verruciform xanthoma is an uncommon benign lesion. The most common presentation occurs in the oral cavity; however, it has also been described in other sites, especially the penis. Herein is reported the first case of verruciform xanthoma of the penis in China, the fourteenth case in the literature. Clinically, genital verruciform xanthoma is often confuses with papillomas, verrucous carcinomas and squamous cell carcinomas, and therefore a histopathological diagnosis is necessary. (Korean J Urol 2004;45: 297-298)
Shaoying Zheng,Longlong Fan,Erika Odendo,Laijun Liu,Danping Shi,Guizhong Li,Jun Chen,Liang Fang,Brahim Elouadi 한국물리학회 2014 Current Applied Physics Vol.14 No.1
Perovskite structure (1 x)BaTiO3exBiAlO3 (BTexBA, x ¼ 0.05, 0.08 and 0.1, corresponding to BTe5BA, BTe8BA and BTe10BA, respectively) ceramics were prepared by a solid state reaction route. Crystal structure of BTexBA ceramics was determined by using XRD. Dielectric properties were studied as a function of temperature at different frequencies, which indicated that the phase transition temperature (Tm) decreased with increasing x. With increasing temperature, thermal expansion dl/l increased while thermal expansion coefficient a had weak concentration dependence. The Burns temperature was much higher than the transition temperature Tm for the BTe5BA and BTe10BA ceramics. Polarization hysteresis loops (PeE), electrostrictive (SeE) and S versus P2 (SeP2) at different temperatures were displayed. Pmax slightly decreased due to thermally activated leakage current, meanwhile, Smax decreased at above Tm with the contribution of ferroelectric domain reorientation decreased. The electrostrictive coefficient Q value was clearly larger than that of lead-based electrostrictors at room temperature. Furthermore, it exhibited a slim loop with negligible hysteresis and a subtle linear feature at higher temperature.