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Engineering Analysis of Strong Motion Data from Recent Earthquakes in Sichuan, China

工程科学与技术 2018年第3期50卷 112-124页

作者： huang chen GALASSO Carmine Department of Civil Environmental and Geomatic Engineering University College London (UCL) London WC1E 6BT UK

Recent earthquakes in the Sichuan Province have contributed to significantly expand the existing ground-motion database for China with new,high-quality ground-motion *** study investigated the compatibility of ground-motion prediction equations(GMPEs)established by the NGA-West2 project in the US and local GMPEs for China,with respect to magnitude scaling,distance scaling,and site scaling implied by recent Chinese strong-motion *** NGA-West2 GMPEs for shallow crustal earthquakes in tectonically active regions are considerably more sophisticated than widely used previous models,particularly in *** a mixed-effects procedure,the study evaluated event terms(inter-event residuals)and intra-event residuals of Chinese data relative to the NGA-West2 *** scaling was investigated by examining trends of intra-event residuals with source-to-site *** with respect to site conditions was investigated by examining trends of intra-event residuals with soil *** study also investigated other engineering characteristics of Chinese strong ground *** particular,the records were analyzed for evidence of pulse-like forward-directivity *** elastic median response spectra of the selected stations were compared to code-mandated design spectra for various mean return *** showed that international and local GMPEs can be applied for seismic hazard analysis in Sichuan with minor modification of the regression coefficients related to the source-to-site distance and soil ***,the Chinese data attenuated faster than implied by the considered GMPEs and the differences were statistically significant in some ***-source,pulse-like ground motions were identified at two recording stations for the 2008 Wenchuan earthquake,possibly implying rupture *** median recorded spectra were consistent with the code-based spectra in terms of amplitude and *** new ground-motion data can be used to deve

关键词： ground motion prediction equations NGA-West2 project code-based spectrum pulse-like ground motions

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Hybrid inter-cell interference management for ultra-dense heterogeneous network in 5G

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Science China(Information Sciences) 2016年第8期59卷 180-192页

作者： chen huang Qianbin chen Lun TANG Key Laboratory of Mobile Communication Technology School of Communication and Information EngineeringChongqing University of Posts and Telecommunications

The Ultra-dense Heterogeneous Network(Het Net), which consists of macro-cells and pico-cells, has been recognized as a key technique to improve network performance. However, the increasing number of pico-cells also causes severe interference including inter-cell interference and intra-cell interference. Therefore, interference management has become an important issue in ultra-dense Het Nets, and the traditional enhanced inter-cell interference coordination(e ICIC) scheme is no longer fit for the high density of small cells. In this paper, a hybrid interference management method based on dynamic e ICIC and coordinated multi-point transmission(Co MP) is proposed. Firstly, a virtual cell is established based on the characteristics of ultra dense Het ***, a novel joint dynamic e ICIC scheme combined with multi-user beamforming is deployed to eliminate the inter-cell interference, and improve the throughput of virtual cell significantly without sharp decrease of throughput of macro-cell. Furthermore, a virtual cell based joint transmission scheme is deployed with a power control algorithm, which can obviously increase the spectrum efficiency of virtual cell edge. Simulation results verify that the proposed scheme can achieve better spectrum efficiency both at macro-cell and virtual cell edges,and the network throughput is also improved.

关键词： interference management coordinated multi-point transmission ultra dense network almost blank subframe spectrum efficiency

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Experimental Research on A New Type of Floating Breakwater for Wave-Absorbing and Energy-Capturing

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China Ocean Engineering 2020年第6期34卷 817-827页

作者： huang Fang-ping GONG Kai LIU Zuo-shi chen Jun-hua huang Yan-chen School of Mechanical Engineering Zhejiang UniversityHangzhou 310027China Ningbo Institute of Technology Zhejiang UniversityNingbo 315100China School of Mechanical and Electrical Engineering Jiangxi University of Science and TechnologyGanzhouChina

To avoid the damage caused by big wind and wave in cage culture, and to solve the problem of energy supply faced by automatic breeding equipment, a new type of floating breakwater, named as Savonius double buoy breakwater(SDBB), is proposed in the paper. The floating breakwater is composed of HDPE cylindrical double buoys and horizontal axis Savonius rotors, and has the functions of wave-absorbing and energy-capturing. Based on the linear wave theory and energy conservation law, the Fourier Transform was applied to separate the two-dimensional wave frequency domain, and the energy captured by the rotors and absorbed by the floating breakwater were *** were conducted in a two-dimensional wave-making flume, and the transmitted waves at different wave heights and periods, the tension of mooring lines, and the rotational torque exerted on the Savonius rotor were measured. A series of performance comparison tests were also performed on the new floating breakwater and the traditional double-floating breakwater. Results show that the new floating breakwater is better than the traditional one in terms of reducing wave transmittance, and the combination of the floating breakwater with Savonius rotors can provide for marine aquaculture equipments with green power supply to a certain degree of self-sufficiency.

关键词： floating breakwater Savonius rotor transmission coefficient wave energy capturing mooring force

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Nucleation barrier of fcc(γ)→hcp(ε) martensitic transformation in Fe-based alloys

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Science China(Technological Sciences) 2004年第1期47卷 121-128页

作者： huang Xing chen Shipu School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200030 China School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200030 China

Based on the dislocation theory and Olson's stacking fault model, a model describing the nucleation of an hcp(ε) martensite embryo at low-angle grain boundary is proposed with the influence of external stress field taken into account. The dependences of temperature (T), shear stress (τ) and dislocation density at grain boundary on the martensite nucleation in FeMnSi based alloy, as an example, are numerically simulated. It has been shown that there exist the subcritical and critical embryos during the course of ε-phase nucleation. The free energy difference between them is just the energy barrier of embryo growth. Depending on T and τ. the characteristic embryo sizes may vary in wide ranges and decreases with increasing σ and decreasing T. The energy condition of martensitic transformation at M s and critical shear stress (τc) is discussed from the viewpoint of kinetics and thus the TEM observed result that stacking fault energy is not zero at M s temperature is reasonably explained. Besides, it is predicted that the high dislocation density at grain boundary can promote the nucleation of fcc→hcp transformation in Fe-based alloys.

关键词： martensitic transformation, stacking fault mechanism, nucleation, energy barrier, temperature, stress, dislocation density.

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Integrated Control of Lateral and Vertical Vehicle Dynamics Based on Multi-agent System

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Chinese Journal of Mechanical Engineering 2014年第2期27卷 304-318页

作者： huang chen chen Long YUN Chaochun JIANG Haobin chen Yuexia School of Automobile and Traffic Engineering Jiangsu University

The existing research of the integrated chassis control mainly focuses on the different evaluation indexes and control strategy. Among the different evaluation indexes, the comprehensive properties are usually not considered based on the non-linear superposition principle. But, the control strategy has some shortages on tyre model with side-slip angle, road adhesion coefficient, vertical load and velocity. In this paper, based on belief, desire and intention（BDI）-agent model framework, the TYRE agent, electric power steering（EPS） agent and active suspension system（ASS） agent are proposed. In the system（SYS） agent, the coordination mechanism is employed to manage interdependences and conflicts among other agents, so as to improve the flexibility, adaptability, and robustness of the global control system. Due to the existence of the simulation demand of dynamic performance, the vehicle multi-body dynamics model is established by SIMPACK. And then the co-simulation analysis is conducted to evaluate the proposed multi-agent system（MAS） controller. The simulation results demonstrate that the MAS has good effect on the performance of EPS and ASS. Meantime, the better road feeling for the driver is provided considering the multiple and complex driving traffic. Finally, the MAS rapid control prototyping is built to conduct the real vehicle test. The test results are consistent to the simulation results, which verifies the correctness of simulation. The proposed research ensures the driving safety, enhances the handling stability, and improves the ride comfort.

关键词： tire steer suspension multi-agent vehicle dynamics

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Restoration of Ultimate Strength of Dented Hemispheres Under External Hydrostatic Pressure

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China Ocean Engineering 2022年第3期36卷 500-507页

作者： huang chen ZHANG Jian WANG Fang DI chen-yang School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Shanghai Engineering Research Center of Hadal Science and Technology Shanghai Ocean UniversityShanghai 201306China

This study aimed to restore the ultimate strength of dented stainless-steel hemispheres with a radius of 90 mm and a thickness of 0.86 *** of the hemispheres were subjected to external hydrostatic *** stainless-steel stiffened caps were used to eliminate the effect of indention on the ultimate *** caps had a radius of 36 mm,a thickness of 0.76 mm,and a height of 10.44 *** hemispherical samples,including two intact hemispheres,two dented hemispheres without stiffening,and two dented hemispheres with stiffening,were *** hemi-sphere was geometrically measured for shape and thickness,hydrostatically tested for destruction,and numerically evaluated for *** experimental and numerical data agreed well with each *** a result,a spherical cap can effectively restore the ultimate strength of dented hemispheres under external hydrostatic *** proposed restoration approach can be used to strengthen underwater pressure hulls with large local geometric imperfections.

关键词： hemisphere restoration ultimate strength hydrostatic pressure buckling

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Vitamin D differentially regulates Salmonella-induced intestine epithelial autophagy and interleukin-1β expression

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World Journal of Gastroenterology 2016年第47期22卷 10353-10363页

作者： Fu-chen huang Department of Pediatrics Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of MedicineKaohsiung 833 TaiwanChina

AIM To investigate the effects of active vitamin D3 on autophagy and interleukin(IL)-1β expression in Salmonella-infected intestinal epithelial cells(IECs).METHODS Caco-2 cells, NOD2 siR NA-, Atg16L1 siR NA- or vitamin D receptor(VDR) siR NA-transfected Caco-2 cells were pretreated with 1,25-dihydroxyvitamin D3(1,25D3), and then infected by wild-type S. typhimurium strain SL1344. The conversion of LC3-I to LC3-II was detected by Western blot analysis and LC3+ autophagosome was analyzed by immunofluorescence. Caco-2 cells or VDR si RNA-transfected cells were pretreated with 1,25D3, and then infected by SL1344. Membrane protein and total RNA were analyzed by Western blot and RT-PCR for VDR and Atg16L1 protein and m RNA expression, respectively. Atg16L1 si RNA-transfected Caco-2 cells were pretreated by 1,25D3 and then infected with SL1344. Total RNA was analyzed by RT-PCR for IL-1β mR NA *** The active form of vitamin D, 1,25D3, showed enhanced VDR-mediated Atg16L1 mR NA expression, membranous Atg16L1 protein expression leading to autophagic LC3 II proteins expression and LC3 punctae in Salmonella-infected Caco-2 cells which was counteracted by Atg16L1 and VDR si RNA, but Atg16L1 mediated suppression of IL-1β expression. Thus, active vitamin D may enhance autophagy but suppress inflammatory IL-1β expression in Salmonella-infected *** Active vitamin D might enhance autophagic clearance of Salmonella infection, while modulation of inflammatory responses prevents the host from detrimental effects of overwhelming inflammation.

关键词： Vitamin D Atg16L1 Autophagy Interleukin1β Salmonella Intestinal epithelia

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Analysis of Heat Dissipation in LED with Various Adhesives

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Journal of Thermal Science 2011年第3期20卷 254-259页

作者： Zi-Gui huang Zheng-Yu chen Department of Mechanical Design Engineering National Formosa University Huwei Yun-lin Taiwan China

Light-emitting diodes (LEDs) are semiconducting, light producing units, with the advantages of small size, long life, low voltage, reduced energy consumption, and high vibration resistance. Unfortunately, most LED output power is converted into heat, with little converted into optical energy. If the heat is not transferred outward from the unit, the LED will overheat and its light emission efficiency, stability, and lifespan will be reduced. Improving LED heat dissipation has become a hot topic. This paper used the finite element method to discuss the temperature change in LED heat sources, using epoxy and Al2O3 adhesives with varying heat transfer coefficients.

关键词： LED heat dissipation finite element method heat transfer coefficient adhesive

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Inner damage identification and residual strength assessment of a 3D printed tunnel with marble-like cementitious materials using piezoelectric transducers

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第4期15卷 838-851页

作者： Guowei Ma chen huang Junfei Zhang School of Civil and Transportation Engineering Hebei University of TechnologyTianjin300401China College of Architecture and Civil Engineering Beijing University of TechnologyBeijing100124China

Quantitative damage identification of surrounding rock is important to assess the current condition and residual strength of underground *** this work,an underground tunnel model with marble-like cementitious materials was first fabricated using the three-dimensional(3D)printing technique and then loaded to simulate its failure mode in the *** zirconate titanate piezoelectric(PZT)transducers were embedded in the surrounding rock around the tunnel in the process of 3D printing.A 3D monitoring network was formed to locate damage areas and evaluate damage extent during *** show that as the load increased,main cracks firstly appeared above the tunnel roof and below the floor,and then they coalesced into the tunnel ***,the tunnel model was broken into several *** resonant frequency and the peak of the conductance signature firstly shifted rightwards with loading due to the sealing of microcracks,and then shifted backwards after new cracks *** overall increase in the root-mean-square deviation(RMSD)calculated from conductance signatures of all the PZT transducers was observed as the load(damage)***-dependent equivalent stiffness parameters(ESPs)were calculated from the real and imaginary signatures of each PZT at different damage *** agreement between equivalent and experimental ESP values was ***,the relationship between the change of the ESP and the residual strength was *** method paves the way for damage identification and residual strength estimation of other 3D printed structures in civil engineering.

关键词： Piezoelectric(PZT)transducers Three-dimensional(3D)printed tunnel Electro-mechanical impedance(EMI) method Equivalent stiffness parameter(ESP) Residual strength

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Fuzzy Chaos Control for Vehicle Lateral Dynamics Based on Active Suspension System

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Chinese Journal of Mechanical Engineering 2014年第4期27卷 793-801页

作者： huang chen chen Long JIANG Haobin YUAN Chaochun XIA Tian School of Automobile and Traffic Engineering Jiangsu University

The existing research of the active suspension system（ASS） mainly focuses on the different evaluation indexes and control strategies. Among the different components, the nonlinear characteristics of practical systems and control are usually not considered for vehicle lateral dynamics. But the vehicle model has some shortages on tyre model with side-slip angle, road adhesion coefficient, vertical load and velocity. In this paper, the nonlinear dynamic model of lateral system is considered and also the adaptive neural network of tire is introduced. By nonlinear analysis methods, such as the bifurcation diagram and Lyapunov exponent, it has shown that the lateral dynamics exhibits complicated motions with the forward speed. Then, a fuzzy control method is applied to the lateral system aiming to convert chaos into periodic motion using the linear-state feedback of an available lateral force with changing tire load. Finally, the rapid control prototyping is built to conduct the real vehicle test. By comparison of time response diagram, phase portraits and Lyapunov exponents at different work conditions, the results on step input and S-shaped road indicate that the slip angle and yaw velocity of lateral dynamics enter into stable domain and the results of test are consistent to the simulation and verified the correctness of simulation. And the Lyapunov exponents of the closed-loop system are becoming from positive to negative. This research proposes a fuzzy control method which has sufficient suppress chaotic motions as an effective active suspension system.

关键词： chaos control fuzzy active suspension system vehicle lateral dynamics

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