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轮胎振动特性的有限元分析及关键影响因素研究

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轮胎工业 2013年第1期33卷 12-20页

作者：冯希金郑小刚危银涛李红卫清华大学汽车工程系北京100084 特拓(青岛)轮胎技术有限公司山东青岛266061

基于Abaqus非线性有限元软件,建立三维轮胎的振动模态分析方法,求出轮胎径向、横向、周向各阶振型,并进行实际轮胎的振动模态试验,试验结果与仿真计算结果吻合良好。在此基础上,进一步研究了充气压力、带束层参数及帘线和橡胶模量对轮... 详细信息

基于Abaqus非线性有限元软件,建立三维轮胎的振动模态分析方法,求出轮胎径向、横向、周向各阶振型,并进行实际轮胎的振动模态试验,试验结果与仿真计算结果吻合良好。在此基础上,进一步研究了充气压力、带束层参数及帘线和橡胶模量对轮胎振动固有频率的影响,揭示了轮胎振动特性与轮胎使用条件以及材料特性之间的相互关系,为解决轮胎配套过程中遇到的噪声、振动和舒适性问题提供了方向。

关键词：轮胎振动模态固有频率有限元分析

A fast classification scheme and its application to face recognition

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第7期14卷 561-572页

作者： xiao-hu MA Yan-qi TAN gang-min zheng School of Computer Science and Technology Soochow University

To overcome the high computational complexity in real-time classifier design, we propose a fast classification scheme. A new measure called 'reconstruction proportion' is exploited to reflect the discriminant information. A novel space called the 'reconstruction space' is constructed according to the reconstruction proportions. A point in the reconstruction space denotes the case of a sample reconstructed using training samples. This is used to search for an optimal mapping from the conventional sample space to the reconstruction space. When the projection from the sample space to the reconstruction space is obtained, a new sample after mapping to the new discriminant space would be classified quickly according to the reconstruction proportions in the reconstruction space. This projection technique results in a diversion of time-consuming calculations from the classification stage to the training stage. Though training time is prolonged, it is advantageous in that classification problems such as identification can be solved in real time. Experimental results on the ORL, Yale, YaleB, and CMU PIE face databases showed that the proposed fast classification scheme greatly outperforms conventional classifiers in classification accuracy and efficiency.

关键词： Reconstruction proportion Reconstruction space Real-time classification Face recognition

Thermodynamic modeling of Fe-C-Mn-Si alloys

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Journal of Iron and Steel Research International 2017年第2期24卷 190-197页

作者： Wei-sen zheng xiao-gang Lu Yan-lin He Lin Li School of Materials Science and Engineering Shanghai University Shanghai 200444 China Department of Materials Science and Engineering KTH Royal Institute of Technology Stockholm 10044 Sweden State Key Laboratory of Advanced Special Steel Shanghai University Shanghai 200072 China

The thermodynamic database of the Fe C Mn-Si system has been developed in the framework of the CALPHAD approach. The sub-ternary systems have been carefully evaluated and revised based on available experimental data. A satisfactory description of the liquid phase in the Fe C-Si system has been obtained. The C Mn Si system was assessed treating the liquid phase as a substitutional solution. Phase equilibria in the C- Mn-Si system, especially those involving the liquid phase, can be well described. Based on the extrapolation of the experimental data in the quaternary system, the Fe Mn Si system has been modified to agree well with experimental data at high temperatures. The comparison between the calculated and measured phase transformation tempera tures confirms the reliability of the present quaternary database. Additionally, the solidification process of Fe-0. 16C-1. 5Mn-1. 5Si （wt. %） alloy was simulated by using the thermodynamic database developed.

关键词： Fe-C-Mn-Si alloy Thermodynamic mode CALPHAD Solidification Partial equilibrium

An input-output model for energy accounting and analysis of industrial production processes： a case study of an integrated steel plant

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Journal of Iron and Steel Research International 2018年第5期25卷 524-538页

作者： xiao-jun Liu Sheng-ming Liao zheng-hua Rao gang Liu School of Energy Science and Engineering Central South University Changsha 410083 Hunan China

To promote sustainability, it has become increasingly vital to properly account material and energy flows in industrial production processes. Therefore, a generic process-level input-output （IO） model was developed to provide an integrated energy （material） accounting and analysis approach for industrial production processes. By extending the existing processlevel IO models, the production, usage, export and loss of by-products were explicitly considered in the proposed IO model. Moreover, the by-products allocation procedures were incorporated into the proposed IO model to reflect individual contributions of products to energy consumption. Finally, the proposed model enabled calculating embodied energy of main products and total energy consumption under hierarchical accounting scope. Plant managers, energy management consultants, governmental officials and academic researchers could use this input-output model to account material and energy flows, thus calculating energy consumption indicators of a production process with their specific system boundary requirements. The accounting results could be further used for energy labeling, identifying bottlenecks of production activities, evaluating industrial symbiosis effects, improving materials and energy utilization efficiency, etc. The model could also be used as a planning tool to determine the effect that a particular change of technology and supply chains may have on the industrial production processes. The proposed model was tested and applied in a real integrated steel mill, which also provided the reference results for related researches. At last, some concepts, computational issues and limi- tations of the proposed model were discussed.

关键词： Input-output model · Energy consumption · Energy accounting · Embodied energy · Industrial production process · Integrated steelmaking process

Permeability evolution and gas flow in wet coal under non-equilibrium state:Considering both water swelling and process-based gas swelling

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International Journal of Mining Science and Technology 2023年第5期33卷 585-599页

作者： Zhiyong xiao gang Wang Changsheng Wang Yujing Jiang Feng Jiang Chengcheng zheng Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and TechnologyQingdao 266590China College of Civil Engineering Fujian University of TechnologyFuzhou 350118China c State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China

Accurate knowledge of gas flow within the reservoir and related controlling factors will be important for enhancing the production of coal bed *** present,most studies focused on the permeability evolution of dry coal under gas adsorption equilibrium,gas flow and gas diffusion within wet coal under the generally non-equilibrium state are often ignored in the process of gas *** this study,an improved apparent permeability model is proposed which accommodates the water and gas adsorption,stress dependence,water film thickness and gas flow *** the process of modeling,the water adsorption is only affected by water content while the gas adsorption is time and water content dependent;based on poroelastic mechanics,the effective fracture aperture and effective pore radius are derived;and then the variation in water film thickness for different pore types under the effect of water content,stress and adsorption swelling are modeled;the flow regimes are considered based on Beskok’s ***,after validation with experimental data,the proposed model was applied to numerical simulations to investigate the evolution of permeability-related factors under the effect of different water *** gas flow in wet coal under the non-equilibrium state is explicitly revealed.

关键词： Gas flow Apparent permeability Water film Adsorption Non-equilibrium state

Comparison of cosmological models using standard rulers and candles

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Research in Astronomy and Astrophysics 2016年第5期16卷 125-134页

作者： xiao-Lei Li Shuo Cao xiao-gang zheng Song Li Marek Biesiada Department of Astronomy Beiiing Normal UniversityBeijing 100875China Department of Physics Capital Normal UniversityBeijing 100048China Department of Astrophysics and Cosmology Institute of PhysicsUniversity of SilesiaUniwersytecka 440-007KatowicePoland

In this paper, we used standard rulers and standard candles （separately and jointly） to explore five popular dark energy models under the assumption of the spatial flatness of the Universe. As standard rulers, we used a data set comprised of 118 galactic scale strong lensing systems （individual standard rulers if properly calibrated for the mass density profile） combined with BAO diagnostics （statistical standard ruler）. Type Ia supernovae served as standard candles. Unlike most previous statistical studies involving strong lensing systems, we relaxed the assumption of a singular isothermal sphere （SIS） in favor of its generalization： the power-law mass density profile. Therefore, along with cosmological model parameters, we fitted the power law index and its first derivative with respect to the redshift （thus allowing for mass density profile evolution）. It turned out that the best fitted ~/parameters are in agreement with each other, irrespective of the cosmological model considered. This demonstrates that galactic strong lensing systems may provide a complementary probe to test the properties of dark energy. The fits for cosmological model parameters which we obtained are in agreement with alternative studies performed by other researchers. Because standard rulers and standard candles have different parameter degeneracies, a combination of stan- dard rulers and standard candles gives much more restrictive results for cosmological parameters. Finally, we attempted an analysis based on model selection using information theoretic criteria （AIC and BIC）. Our results support the claim that the cosmological constant model is still best and there is no （at least statistical） reason to prefer any other more complex model.

关键词： (cosmology:) dark energy -- cosmology: observations -- (cosmology:) cosmological param-eters

Implementation of Quantum Fourier Transform and Its Applications via Quantum-Dot Spins and Microcavity

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Communications in Theoretical Physics 2009年第9期52卷 425-430页

作者： DONG Ping zheng xiao-Hu ZHANG gang CAO Zhuo-Liang Department of Physics Hefei Teachers College Hefei 230061 China School of Physics and Material Science Anhui University Hefei 230039 China Department of Mathematics and Physics West Anhui University Lu＇an 237012 China

A scheme for implementing discrete quantum Fourier transform is proposed via quantum dots embedded in a microcavity, and then some of its applications are investigated, i.e., Deutsch 3ozsa. algorithm and Shor＇s quantum factoring. In particular, the detailed process of implementing one^qubit Deutsch Jozsa algorithm and the factorization of N = 15 are given. The microcavity mode is only virtually excited in the whole interaction, so the effective decoherent has slight effect on the current scheme. These schemes would be an important step to fabricate a solid quantum computer.

关键词： quantum Fourier transform quantum dot quantum algorithm

Theoretical Studies of g Factors and Defect Structures for Cubic, Tetragonal, and Orthorhombic Fe^＋ Centers in Alkali Halides MX （M=Li, Na; X = F, C1）

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Communications in Theoretical Physics 2006年第1X期46卷 167-170页

作者： LIU Hong-gang WU xiao-Xuan zheng Wen-Chen Department of Material Science Sichuan University Chengdu 610064 China Department of Physics Civil Aviation Flying Institute of China Guanghan 618307 China International Centre for Materials Physics the Chinese Academy of Sciences Shenyang 110016 China

The EPR 9 factors for cubic, tetragonal and orthorhombic Fe^＋ centers in alkali halides MX （M= Li, Na; X = F, CI） are calculated from second-order perturbation formulas of g factors based on cluster approach for 3d^7 ions in three symmetries. From calculations, the g factors of these Fe^＋ centers in MX crystals are reasonably explained and the defect structural data for the tetragonal and orthorhombic Fe^＋ centers are estimated. The results are discussed.

关键词： crystal- and ligand-field theory electron paramagnetic resonance defect structure

6063铝合金Φ170mm×10mm管型导体生产工艺开发

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轻合金加工技术 2010年第5期38卷 34-35页

作者：郑小刚兰国林马明祥毕保国陈春杰郭文革珠海鸿帆有色金属化工有限公司广东珠海519015 湖北白莲高新有色材料股份有限公司湖北黄冈438200

介绍6063铝合金Φ170mm×10mm管型导体主体生产工艺,主要从化学成分控制、三辊热轧和冷拔工艺三方面进行了简要总结。

关键词： 6063铝合金管型导体生产工艺