郑晓静
博士研究生 教授
兰州大学
风沙运动机理研究
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- 姓名:郑晓静
- 目前身份:在职研究人员
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师, 国家杰出青年科学基金获得者, 中国科学院院士
- 职称:高级-教授
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学科领域:
力学
- 研究兴趣:风沙运动机理研究
郑晓静,女,汉族,1958年5月出生,浙江乐清人,理学博士,教授,博士生导师,中国科学院院士,发展中国家科学院院士,全国政协委员,中国科协全委会委员、中科院学部数理学部常委、《Computers, Materials & Continua》联合主编、《固体力学学报》和《Acta Mechanica Solida Sinica》主编、“甘肃省荒漠化与风沙灾害防治国家重点实验室”和“北京大学湍流与复杂系统国家重点实验室”学术委员会主任等。
郑晓静院士对非线性圆薄板方程精确求解以及近似解析求解方法的收敛性等问题做出了具有终结性意义的工作,被钱伟长等学界同行评价为是“国内外少见的优秀工作”、“已处国内外领先地位,是五十年来该课题最完备的一项研究”。开拓了电磁固体力学研究领域,针对复杂电磁场环境下的铁磁等功能结构材料力学行为开展了理论和计算研究,研究成果获IEEE超导委员会的最佳贡献论文奖和国家自然科学二等奖。开创了风沙环境力学,对风沙电现象开展了系统研究,成功实现了对沙丘场形成演化过程的定量模拟,“将原有的风沙物理学理论体系向更为合理和准确的方向大大推进了一步”、“提升了我国风沙运动研究的国际影响力”,部分成果获国家科技进步二等奖。发表学术论文200余篇(SCI论文140余篇),出版学术专著3部和科普著作1部。获“中国青年科技奖”、“做出突出贡献的中国博士学位获得者”、“国家杰出青年科学基金”、入选国家“百千万人才工程”第一、二层次人选(1996)、全国“三八红旗手”、 第五届“十佳全国优秀科技工作者提名奖”和“全国优秀科技工作者奖”等。
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781
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成果数
14
【期刊论文】Impact Craters in Loose Granular Media
郑晓静, Xiao-Jing Zheng, Zhen-Ting Wanga, and Zhao-Guo Qiu
The European Physical Journal E., V.13: 321-324.,-0001,():
-1年11月30日
The craters formed by the impact of steel balls with a loose sand bed are experimentally studied. Both crater size and morphology depend strongly on the impact angle. Two scaling laws, corresponding to length and width respectively, are proposed.
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【期刊论文】The feature of stratification in the blowing sand cloud
郑晓静, ZHENG Xiaojing, HE Lihong, & WU Jianjun
Chinese Science Bulletin 2003 Vol. 48 No.14 1493-1498,-0001,():
-1年11月30日
The profiles of particle concentration in saltation layer versus height are calculated, by the motion equations for a saltating grain in conjunction with different probability distribution functions of the vertical liftoff velocities of grains and an empirical expression of wind velocity. The numerical results demonstrated that the stratification phenomenon exists in the particle concentration profiles and showed increasing, saturating and decreasing features, respectively, when the probability distribution functions of liftoff velocities adopted in the calculation are similar to a normal distribution or a two-parameter gamma distribution. When the distribution function of liftoff velocities is taken as an exponential form, the profile of particle concentration decreases monotonically. A numerical simulation of mass flux of grains, performed by the model suggested in this paper, is in reasonable accordance with the measured data.
windblown sand-flow, mathematical simulation, particle concentration, distribution of liftoff velocity.,
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郑晓静
力学进展,2004,34(1):77~86,-0001,():
-1年11月30日
土壤风蚀以及沙尘暴是人类面临的重大自然环境灾害之一,它直接关系着人类的生存环境和生活质量。许多国家和政府以及科学家们对此一直十分关注并开展了大量研究。由于大气和地表条件的多样性以及地表沙粒的运动与风场作用的相互耦合,导致风沙运动问题研究的复杂性。除此之外,伴随着对风沙运动机理的研究和对沙尘暴的观测,人们发现在风沙跃移运动和沙尘暴中的沙粒带有电荷并形成风沙电场。沙粒的运动不仅导致沙粒带电和风沙电场形成,而且也直接受到沙粒带电和风沙电场的影响。为了弄清风沙电的起因以及揭示其影响规律,研究人员对此进行了野外观测、实验室测量和理论推测等。本文将就这一问题重点介绍有关风沙运动中沙粒带电的机理、风沙电场分布规律、沙粒带电对风沙运动的微宏观物理量以及沙尘暴中沙粒带电对电磁波散射的影响等方面的实验和理论研究的基本概况和进展以及作者等人在此方面的研究工作。主要包含内容有:沙粒带电及其电场的基本实验测量,沙粒带电对风沙运动的影响,沙尘暴对电磁波衰减的影响研究以及有关风沙起电的机理研究等。同时,对这一研究领域中目前关注与存在的主要问题给予评述。
凤沙电场, 沙粒带电机理, 宏微观影响, 实验测量, 理论分析
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郑晓静, Xiao Jing Zheng, Ning Huang, and You-He Zhou
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 108, NO. D10, 4322, doi:10.1029/2002JD002572, 2003,-0001,():
-1年11月30日
This article presents a measurement of electrification generated by wind-blown sands in a field wind tunnel and a numerical methodology to simulate the effect of electrification on the sand saltation movement after the mutual couple interaction between the sand movement and the wind flow is taken into account. The measured data of electric charge on the "uniform" sands in the wind-tunnel tests show that the sign of electric charge, either negative or positive, is mainly dependent on the diameter size of sand particles, i.e., negative charge is gained when the diameter is smaller than 250 mm and positive charge is obtained if the diameter is larger than 500 mm, and that for both "uniform" and mixed sands, the average charge-to-mass ratio decreases with increasing the wind velocity, and increases with height from sand bed. Meanwhile, the measurement of electric field in wind-sand cloud related to the electric charge displays that the magnitude of electric field increases generally as the wind velocity and the height increase, and the direction of the field is always upwardly vertical to the Earth’s surface, which is opposite to that of the fair-weather field. In order to exhibit the effect of electrification on sand saltation movement, a theoretical model by considering the mutual coupling interaction between wind flow and sand movement is proposed after the electric force exerted on the moving sands is considered. Through solving the nonlinear coupling dynamic equations by a proposed program, the effect of electrification on sand saltation motion, e.g., trajectory, is discussed quantitatively. After that, its effect on wind-sand transport flux, sand ejecta flux, and wind profile is also displayed. The results show that the prediction for the Bagnold's kink is good agreement with the measurement in literature.
Charge-to-mass ratio, wind-blown sand flux, electrostatic force, saltation, coupling effect
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【期刊论文】BENDING AND BUCKLING OF FERROELASTIC PLATES
郑晓静, By Xiao Jing Zheng, You He Zhou, Xing Zhe Wang, and J. S. Lee, Member, ASCE
,-0001,():
-1年11月30日
A theoretical study of bending and buckling of ferroelastic plates in the presence of magnetic fields is carried out based on the model that takes into account the nonlinear field-structure interaction. The resultant force system derived from the interaction between magnetic fields and ferromagnetic materials is composed of the body force only. Using this model, the bending and buckling problems of a cantilevered ferromagnetic plate and simply supported rectangular plates in transverse and oblique magnetic fields are investigated with the aid of a numerical approach. Numerical results reveal some interesting features of magnetoelastic bending and buckling phenomena due to the nonlinear nature of the field-structure interaction.
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【期刊论文】A magnetoelastic theoretical model for soft ferromagnetic shell in magnetic field
郑晓静, Xiaojing Zheng*, Xingzhe Wang
International Journal of Solids and Structures 40(2003)6897-6912,-0001,():
-1年11月30日
With the aid of a generalized variational method, in this paper, a theoretical model for soft ferromagnetic shells is derived to describe their magnetoelastic behavior in an applied magnetic field. Having made a quantitative comparison between the numerical predictions given by several theoretical models and the experimental results on strains of a cylindrical shell, we find that the predictions got by our model are in good agreement with the experimental data. It is also found that the Moon s model is a special case of the model derived in this paper when the relative magnetic permeability
Ferromagnetic shells, Magnetoelastic interaction, Theoretical model, Numerical analysis
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【期刊论文】Dynamic stability of a cantilever conductive plate in transverse impulsive magnetic field
郑晓静, Xiaojing Zheng*, Jianping Zhang, Youhe Zhou
International Journal of Solids and Structures 42(2005)2417-2430,-0001,():
-1年11月30日
between the eddy current induced in the plate and the magnetic fields included the applied one and one induced by the eddy current in the plate. Some in-plane components of the electromagnetic force exerted on the plate are usually neglected in existing researches on some mechanical behavior, such as bending and vibrating, of the plate. In this paper, a cantilever conductive thin plate in an applied transverse impulsive magnetic field is taken as an example, in which there only exist in-plane components of the electromagnetic force, to show the effect of these components on bending and vibrating of the plate. The numerical results demonstrate that the plate will be dynamic instability for some kinds of applied transverse impulsive magnetic field. The critical values B0cr of applied magnetic field are searched out. The effects of the conductivity r and the length–thickness ratio a/h of the plate as well as the impulse parameter s of applied impulsive magnetic field on the critical value B0cr of applied magnetic field are also discussed in detail
Conductive thin plate, Impulsive magnetic field, Eddy current, Dynamic stability, Numerical simulation
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【期刊论文】Large-Deflection Deformation of Ferromagnetic Plates in Magnetic Fields
郑晓静, Xiaojing Zheng and Xingzhe Wang
,-0001,():
-1年11月30日
Magnetoelastic buckling and postbuckling of ferromagnetic rectangular plates with geometric nonlinearity in magnetic fields are quantitatively investigated in this paper. A numerical program combining the nonlinear finite element method with an iterative method is proposed to solve the twofold nonlinear problem. The numerical results show that the ferromagnetic plate buckles when it is in a transverse magnetic field, and it bends prior to its instability when it is in an oblique magnetic field with tiny incident angle. The deflection pattern of the plates is changed from one-wave to semiwave after they lose stability.
Plates, Elasticity, Geometric nonlinearity, Buckling, Deformation, Magnetic fields.,
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郑晓静, Xingzhe Wang, You-He Zhou*, Xiaojing Zheng
International Journal of Engineering Science 40(2002)1957-1973,-0001,():
-1年11月30日
Based on a generalized variational principle of total energy functional, this paper presents a theoretical model to describe the magneto-thermo-elastic interaction of soft ferroelastic bodies with nonlinear magnetization under stationary thermal and magnetic fields. The energy functional of the magneto-thermoelastic system is established by the summation of energy of sub-systems of nonlinearly magnetized magnetic field, thermal field, and mechanical deformation. By means of the manipulation of the mixed variational principle with independent variations of magnetic scalar potential, displacement vector, and temperature, all governing equations, which are nonlinear and coupling among magnetic, elastic and thermal fields, together with the expressions of magnetic forces are obtained from the variational approach. In order to valuate the obtained model, some existing models of the magneto-elasticity and the thermo-elasticity, which are validly demonstrated in literature, as special cases of the problem considered here are deduced out from the general case. Finally, an analytical analysis of magneto-thermo-elastic instability is conducted to a simply supported ferromagnetic rectangular thin plate under both a uniform distribution of temperature and a uniform transverse magnetic field by means of the linearized theory and the perturbation technique.
Ferromagneic material/, bodies, Nonlinear magnetization, Magneto-thermo-elastic interaction, Energy functional, Generalized variational principle, Theoretical model
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【期刊论文】Magnetoelastic analysis of non-circular superconducting partial torus
郑晓静, Xiao Jing Zheng*, Xingzhe Wang, You-He Zhou
International Journal of Solids and Structures 37(2000)563-576,-0001,():
-1年11月30日
In this paper, we present a theoretical analysis of magnetoelasticity for a set of superconducting partial torus with D-typed non-circular coils. This kind of coil is an essential model adopted in the new conception design of Tokamak fusion reactors. Its magneto
Non-circular D-typed coil, Superconducting partial torus, Bending and instability, Magnetoelasticity, Critical current, Eect of radius ratio
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