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Parametric study on single shot peening by dimensional analysis method incorporated with finite element method

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Acta Mechanica Sinica 2012年第3期28卷 825-837页

作者： Xian-Qian Wu Xi Wang Yan-Peng Wei Hong-Wei Song chen-guang huang Key Laboratory for Hydrodynamics and Ocean Engineering Institute of MechanicsChinese Academy of Sciences100190 BeijingChina

Shot peening is a widely used surface treatment method by generating compressive residual stress near the surface of metallic materials to increase fatigue life and re- sistance to corrosion fatigue, cracking, etc. Compressive re- sidual stress and dent profile are important factors to eval- uate the effectiveness of shot peening process. In this pa- per, the influence of dimensionless parameters on maximum compressive residual stress and maximum depth of the dent were investigated. Firstly, dimensionless relations of pro- cessing parameters that affect the maximum compressive residual stress and the maximum depth of the dent were de- duced by dimensional analysis method. Secondly, the in- fluence of each dimensionless parameter on dimensionless variables was investigated by the finite element method. Fur- thermore, related empirical formulas were given for each di- mensionless parameter based on the simulation results. Fi- nally, comparison was made and good agreement was found between the simulation results and the empirical formula, which shows that a useful approach is provided in this pa- per for analyzing the influence of each individual parameter.

关键词： Keywords Shot peening - Maximum compressive residualstress Maximum depth of the dent Dimensional analysismethod ~ Finite element method

Role of Equatorial Wave Transitions in Tropical Cyclogenesis over the Western North Pacific

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Atmospheric and Oceanic Science Letters 2008年第1期1卷 64-68页

作者： chen guang-Hua huang Rong-Hui Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100080 China

This study associates tropical cyclone (TC) activity over the western North Pacific (WNP) with the equatorial wave transition from an interannual viewpoint, revealing that the tropical cyclogenesis mean location may be modulated by a longitudinal shift in the transition of Mixed Rossby-gravity (MRG) waves to off-equatorial tropical depression (TD) disturbances from year to year. To a large extent, the wave transition is attributable to the monsoon trough in response to the thermal state of the warm pool (WP) over the WNP. During the cold state years in the WP, the basic flow confluence region associated with the monsoon trough penetrates eastward, leading to an eastward shift in the location of the wave transition. Such an environment, in which wave accumulation and energy conversion occur, is favorable for tropical cyclogenesis; as a result, the averaged cyclogenesis location moves eastward. The condition is reserved during the warm years in the WP, resulting in the prominent westward-retreating mean TC formation.

关键词： equatorial waves tropical cyclogenesis west-em North Pacific

Application of deep learning method to Reynolds stress models of channel flow based on reduced-order modeling of DNS data

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Journal of Hydrodynamics 2019年第1期31卷 58-65页

作者： Zhen Zhang Xu-dong Song Shu-ran Ye Yi-wei Wang chen-guang huang Yi-ran An Yao-song chen Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China College of Engineering Science University of Chinese Academy of SciencesBeijing 100049China College of Engineering Peking UniversityBeijing 100871China

Recently,the methodology of deep learning is used to improve the calculation accuracy of the Reynolds-averaged Navier-Stokes (RANS) *** this paper,a neural network is designed to predict the Reynolds stress of a channel flow of different Reynolds *** rationality and the high efficiency of the neural network is validated by comparing with the results of the direct numerical simulation (DNS),the large eddy simulation (LES),and the deep neural network (DNN) of other *** further enhance the prediction accuracy,three methods are developed by using several algorithms and simplified models in the neural *** the method *** regularization is introduced and it is found that the oscillation and the overfitting of the results are eflectively *** the method 2,y^+ is embedded in the input variable while the combination of the invariants is simplified in the method *** the predicted results,it can be seen that by using the first two methods,the errors are ***,the method 3 shows considerable advantages in the DNS trend and the smoothness of a ***,it is concluded that the DNNs can predict effectively the anisotropic Reynolds stress and is a promising technique of the computational fluid dynamics.

关键词： Deep neural network channel flow turbulence model Reynolds stress

Effects of laser power density on static and dynamic mechanical properties of dissimilar stainless steel welded joints

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Acta Mechanica Sinica 2012年第5期28卷 1334-1339页

作者： Yan-Peng Wei Mao-Hui Li Gang Yu Xian-Qian Wu chen-guang huang Zhu-Ping Duan Key Laboratory of Hydrodynamics and Ocean Engineering Institute of MechanicsChinese Academy of Sciences The Quartermaster Equipment Research Institute of the General Logistics Department of PLA Key Lab of Mechanics in Advanced Manufacturing Institute of MechanicsChinese Academy of Sciences The State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of Sciences

The mechanical properties of laser welded joints under impact loadings such as explosion and car crash etc. are critical for the engineering designs. The hardness, static and dynamic mechanical properties of AISI304 and AISI316L dissimilar stainless steel welded joints by CO2 laser were experimentally studied. The dynamic strainstress curves at the strain rate around 103 s-1 were obtained by the split Hopkinson tensile bar （SHTB）. The static mechanical properties of the welded joints have little changes with the laser power density and all fracture occurs at 316 L side. However, the strain rate sensitivity has a strong depen- dence on laser power density. The value of strain rate factor decreases with the increase of laser power density. The welded joint which may be applied for the impact loading can be obtained by reducing the laser power density in the case of welding quality assurance.

关键词： Laser welding Dynamic mechanics Strain rate.Power density

Quantifying the strength of magnetic fields using baryon electric charge correlation

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Nuclear Science and Techniques 2024年第8期35卷 5-8页

作者： Xu‑guang huang Physics Department and Center for Particle Physics and Field Theory Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics National Natural Science Foundation of China and Fudan UniversityShanghai 200438China

Although heavy-ion collisions generate strong magnetic fields,their direct measurement is a challenging task.A new observable,the baryon electric charge correlation,was recently found to be sensitive to the magnetic field strength and thus could be used as a magnetometer for heavy-ion ***,this observable may shed light on the equation of state and phase structure of quantum chromodynamics(QCD)under magnetic *** and understanding the phase structure of quantum chromodynamics(QCD)is important in contemporary physics[1].

关键词： charge observable magnetic

Electromagnetic fields in ultra-peripheral relativistic heavy-ion collisions

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Nuclear Science and Techniques 2024年第2期35卷 103-109页

作者： Jie Zhao Jin-Hui chen Xu-guang huang Yu-Gang Ma Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China Physics Department and Center for Particle Physics and Field Theory Fudan UniversityShanghai 200438China

Ultra-peripheral heavy-ion collisions(UPCs)offer unique opportunities to study processes under strong electromagnetic *** these collisions,highly charged fast-moving ions carry strong electromagnetic fields that can be effectively treated as photon *** exchange of photons can induce photonuclear and two-photon interactions and excite *** excitation of the ions results in Coulomb dissociation with the emission of photons,neutrons,and other ***,the electromagnetic fields generated by the ions can be sufficiently strong to enforce mutual interactions between the two colliding ***,the two colliding ions experience an electromagnetic force that pushes them in opposite directions,causing a back-to-back correlation in the emitted *** a Monte Carlo simulation,we qualitatively demonstrate that the above electromagnetic effect is large enough to be observed in UPCs,which would provide a clear means to study strong electromagnetic fields and their effects.

关键词： Electromagnetic fields Neutrons Ultra-peripheral relativistic heavy-ion collisions(UPC)

Realgar-indigo naturalis formula for the treatment of patients with relapsed and arsenic trioxide-resistant acute promyelocytic leukemia:A case series

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Journal of Integrative Medicine 2024年第5期22卷 614-620页

作者： Yong-guang Fang Shi-lin huang Nan-nan chen Department of Hematology PLA 967th HospitalDalian 116021Liaoning ProvinceChina

Introduction There is currently no standard treatment for relapsed and arsenic trioxide(ATO)-resistant acute promyelocytic leukemia(APL).Here,we report a case series of realgar-indigo naturalis formula(RIF)for the successful treatment of patients with relapsed and ATO-resistant *** presentation Two patients in the first relapse and one in the second relapse failed to achieve hematologic complete remission(HCR)when reinduced by ATO;the other five patients progressed to relapse during ATO-based regimens for post-remission *** eight patients received RIF in three doses per day totaling 130 mg/kg(≤30 pills)as induction therapy and achieved HCR at a median time of 46.5 *** received 5 years of post-remission therapy,which consisted of combined chemotherapy followed by *** this period,the patients did not experience renal dysfunction or QT interval *** the last follow-up,three patients survived without relapse,two patients survived with a second or third relapse and third or fourth remission,and the other three patients relapsed for a third or fourth time and *** 5-year overall survival and event-free survival rates were 75.0%(95%confidence interval[CI]:31.5–93.1)and 37.5%(95%CI:5.6–71.7),*** RIF for induction therapy and RIF combined with chemotherapy for post-remission therapy may represent an effective and safe protocol for the treatment of patients with relapsed and ATO-resistant APL.

关键词： Acute promyelocytic leukemia Realgar-indigo naturalis formula Arsenic Trioxide Resistant Case report

Subclinical impairment of left ventricular myocardium function in type 2 diabetes mellitus patients with or without hypertension

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World Journal of Diabetes 2024年第6期15卷 1272-1279页

作者： Zeng-guang chen guang-An Li Jun huang Li Fan Department of Cardiology The Affiliated Changzhou Second People’s Hospital with Nanjing Medical UniversityChangzhou 213000Jiangsu ProvinceChina Department of Echocardiography The Affiliated Changzhou Second People’s Hospital with Nanjing Medical UniversityChangzhou 213000Jiangsu ProvinceChina

BACKGROUND Cardiovascular disease has been the leading cause of morbidity and mortality for type 2 diabetes mellitus(T2DM)patients over the last *** To determine whether layer-specific global longitudinal strain(GLS)combined with peak strain dispersion(PSD)can be used to assess left ventricle(LV)myocardium systolic dysfunction in T2DM patients or without hypertension(HP).METHODS We enrolled 97 T2DM patients,70 T2DM+HP patients and 101 healthy ***-specific GLS and PSD were calculated by EchoPAC software in apical three-,four-and two-chamber *** of the epimyocardial,middle-layer and endomyocardial(GLSepi,GLSmid,and GLSendo)were measured and *** operating characteristic analysis was performed to detect LV myocardium systolic dysfunction in T2DM *** There were significant differences in GLSepi,GLSmid,GLSendo,and PSD between healthy subjects,T2DM patients and T2DM patients with HP(PT2DM patients>T2DM with HP patients in the absolute values of GLSepi,GLSmid and GLSendo(P<0.001),while PSD was ranked healthy subjects

关键词： Type 2 diabetes mellitus Hypertension Speckle tracking echocardiography Global longitudinal strain Peak strain dispersion

Numerical simulation of dynamic characteristics of a water surface vehicle with a blended-wing-body shape

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Journal of Hydrodynamics 2018年第3期30卷 433-440页

作者： Xiao-cui Wu Yi-wei Wang chen-guang huang Zhi-qiang Hu Rui-wen Yi Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Beijing Power Machinery Institute Beijing 100074China Shenyang Institute of Automation Chinese Academy of SciencesShenyang 110016China

The blended-wing-body shape vehicle is a new type of water surface vehicle with a large square coefficient. The interference of the wave systems under a high speed condition is more significant for the blended-wing-body shape vehicle and the dynamic characteristics of the new type vehicle are very different from that of a traditional vehicle. In this paper, the implicit volume of fluid（VOF） method is adopted to simulate the wave resistance of the high speed blended wing body vehicle, and a semi-relative reference frame method is proposed to compute the maneuvering coefficients. The effects of the navigation speed, the drift angle and the rotating radius are studied. The dimensional analysis method is used to assess the influence of Fr and L/R on the results. The wave making resistance coefficient against the speed sees a large fluctuation because of the serious wave interference. The lateral rotation maneuvering characteristics under the surface navigation condition is nonlinear and more complex than under the under water condition, which is quite different to control.

关键词： High speed blended wing body vehicle volume of fluid(VOF)method semi-relative reference frame wave making resistance