检索结果-南通市图书馆

AXISYMMETRIC BOUNDARY-VALUE PROBLEMS IN A PIEZOELECTRIC MEDIUM

在线全文

学校读者我要写书评

暂无评论

Acta mechanica Solida Sinica 1998年第2期11卷 104-112页

作者： Zheng Bailin Wang Zikun Ji Xing Tongji Univ Dept Engn Mech & Technol Shanghai 200092 Peoples R China Xian Jiao Tong Univ Dept Mech Engn Xian Peoples R China

Based on the general solution of three-dimensional problems inpiezoelectric medium, with the method of Green's functins~[2],axisymmetric boundary-value problems are discussed. The purpose ofthis research is for analyzing the effective on mechanics andelectricity of the piezoelectric ceramics caused by voids andinclusions. The displacement, traction and electric Green's functionscorresponding to circular ring loads acting in the interior of apiezoelectric ceramic are obtained. A cylindrical coordinate systemis employed and Hankel transform are applied with respect to radialcoor- dinates. Explicit solutions for Green's functions are presentedin terms of infinite integrals of Lipshitz- Hankel type. By solving atraction boundary-value problem, the solution scheme is illustrate.

关键词： piezoelectric ceramics voids and inclusions Hankel transforms

Nonlinear Coupled Motions for a Given Two-Point Tension Mooring System

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 1998年第3期13卷 253-264页

作者： Sun, MG Long, J Zhongshan Univ Dept Appl Mech & Engn Canton 510275 Peoples R China

The nonlinear behaviors of plane coupled motions for a given two-point tension mooring system, are discussed in the present paper. For a cylinder moored by two taut lines under the action of gravity, buoyance and forces due to wave-current and mooring lines, a mathematical model of motions with three degrees of freedom is established. The steady solution and stability are analyzed. By integrating the equations of motions, history, phase map and Poincare map are obtained. The Liapunov exponents are also computed. The numerical results show that: the horizontal movement will increase, and stability will also increase as the steady force increases. The amplitude of responses will decrease as time-dependent forces decrease. Because of the geometric nonlinearity, there exist many windows bifurcating to pseudo-periodic or multi-periodic solution. The bifurcating patterns may be different. The behaviors are very complex. Under wave excitation alone, the motions are nonsymmetrical but still symmetrical statistically.

关键词： two-point mooring time-domain simulation Poincare map phase map Liapunov exponent

LEGENDRE SERIES SOLUTIONS FOR TIME-VARIATION DYNAMICS

在线全文

学校读者我要写书评

暂无评论

Acta mechanica Solida Sinica 2000年第1期13卷 60-66页

作者： Cao, ZY Zou, GP Tang, SG Tongji Univ Dept Engn Mech & Technol MOE Key Lab Solid Mech Shanghai 200092 Peoples R China

In this topic, a new. approach to the analysis of time-variation dynamics is proposed by use of Legendre series expansion and Legendre integral operator matrix. The theoretical basis for effective solution of time-var... 详细信息

关键词： time-variation dynamics Legendre series state space equation integral operator matrix

Mathematical Model and Its Application of Radial Effective Thermal Conductivity for Coil Heat Transfer in HPH Furnace

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2002年第2期11卷 134-137页

作者： Wenfei Wu Fan Yu Xinxin Zhang Yi Zuo Univ Sci & Technol Beijing Sch Mech Engn Dept Thermal Engn Beijing 100083 Peoples R China

Temperature uniformity of steel coils in High Performance Hydrogen bell-type annealing furnace has a significant effect on their quality and production. The hot rolled coil can be considered as a periodically laminated material composed of steel layers and interface layers in radial direction. A new formula for the radial effective thermal conductivity has been proposed, which is based on surface characteristic, strip thickness and compressive stress of the rolled coil. Furthermore, it has been used to develop a heat transfer mathematical model for steel coils in the HPH furnace. The calculated annealing curves using this mathematical model are in good agreement with the experimental data.

关键词： HPH furnace thermal conductivity heat transfer mathematical model.

LATERAL STABILITY OF ALTERNATIVE HORIZONTAL LEVITATION ELECTROMAGNETIC CONTINUOUS CASTING OF ALUMINIUM SHEET

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1998年第3期8卷 86-89页

作者： Deng, K Shen, M Ren, ZM Shanghai Univ Coll Mat Sci & Engn Shanghai 200072 Peoples R China Shanghai Univ Shanghai Inst Appl Math & Mech Shanghai 200072 Peoples R China

１ＩＮＴＲＯＤＵＣＴＩＯＮＡｌｔｅｒｎａｔｉｖｅｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｃｏｎｔｉｎｕｏｕｓｃａｓｔｉｎｇｉｓａｈｉｇｈｌｉｇｈｔｅｄｎｅｗｔｅｃｈｎｉｑｕｅ．Ｉｎｔｈｉｓｔｅｃｈｎｉｑｕｅｔｈｅｅｌｅｃｔ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＡｌｔｅｒｎａｔｉｖｅｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｃｏｎｔｉｎｕｏｕｓｃａｓｔｉｎｇｉｓａｈｉｇｈｌｉｇｈｔｅｄｎｅｗｔｅｃｈｎｉｑｕｅ．Ｉｎｔｈｉｓｔｅｃｈｎｉｑｕｅｔｈｅｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｆｏｒｃｅｐｒ...

关键词： stability horizontal continuous casting electromagnetic casting aluminium sheet

THE CURVED BAR SUBJECTED TO AN ARBITRARILY DISTRIBUTED LOADING:ANOTHER PARADOX IN THE TWO-DIMENSIONAL THEORY OF ELASTICITY

在线全文

学校读者我要写书评

暂无评论

Acta mechanica Solida Sinica 1996年第3期9卷 253-262页

作者： Ding, HJ Peng, NL Li, Y ZHEJIANG UNIV DEPT CIVIL ENGNHANGZHOU 310027PEOPLES R CHINA NANCHANG UNIV INST ENGN MECHNANCHANG 330029PEOPLES R CHINA BOSTON UNIV BOSTONMA 02215

The problem of the curved bar subjected to an arbitrarily distributed loading on the surfaces r=a and r=b is sp!ved by using the method of complex functions and expanding the boundary conditions at r=a and r=b into Fourier series. Then another paradox in the two-dimensional theory of elasticity is discovered, i. e., the classical solution becomes infinite when the curved bat is subjected to a uniform loading or when the angle included between the two ends of the curved bar 2 alpha is equal to 2 pi and the curved bar is subjected to a sine or cosine loading. In this paper the paradox is resolved successfully and the solutions for the paradox ate obtained. Moreover, the modified classical solution which remains bounded as 2 alpha approaches 2 pi is provided.

关键词： curved bar paradox elasticity

THE EXPLICIT FORMULATIONS FOR THE L-INTEGRAL

在线全文

学校读者我要写书评

暂无评论

Acta mechanica Solida Sinica 1999年第1期12卷 74-82页

作者： Shi Junping Liu Xiehui Chen Yiheng Xian Univ Technol Dept Engn Mech Xian 710048 Peoples R China Xian Jiao Tong Univ Sch Civil Engn & Mech Xian 710049 Peoples R China

In this paper, a simple but inberent relation between theL-integral and the Buekner work conjugate integral is proved forcrack problems in isotropic, anisotropic, and dissimilar materi- als,respectively. It is found that, in the above-mentioned three cases,the L-integral, from the math- ematical point of view as well as inprinciple, arises from Betti's reciprocal theorem. This means thatthe Bueckner work conjugate integral is a more generalpath-independent integral than the others since any otherpath-independent integrals could be derived by using the Buecknerintegral while choosing a different subsidiary stress-displacementfield.

关键词： integral work conjugate integral crack

EMULSION USED FOR ALUMINIUM TUBE DRAWING

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1997年第2期7卷 138-141页

作者： Huang, WJ Tan, JP Zhong, J Tan, YQ Li, L CENT S UNIV TECHNOL COLL MECH & ELECT ENGNCHANGSHA 410083PEOPLES R CHINA

ＥＭＵＬＳＩＯＮＵＳＥＤＦＯＲＡＬＵＭＩＮＩＵＭＴＵＢＥＤＲＡＷＩＮＧ①ＨｕａｎｇＷｅｉｊｉｕ，ＴａｎＪｉａｎｐｉｎｇ，ＺｈｏｎｇＪｕｅ，ＴａｎＹｕａｎｑｉａｎｇ，ＬｉＬｉＣｏｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥ... 详细信息

ＥＭＵＬＳＩＯＮＵＳＥＤＦＯＲＡＬＵＭＩＮＩＵＭＴＵＢＥＤＲＡＷＩＮＧ①ＨｕａｎｇＷｅｉｊｉｕ，ＴａｎＪｉａｎｐｉｎｇ，ＺｈｏｎｇＪｕｅ，ＴａｎＹｕａｎｑｉａｎｇ，ＬｉＬｉＣｏｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｒｉ...

关键词： aluminium tube drawing emulsions brightness feature annealing

Evaluation of gas-liquid separation performance of natural gas filters

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2009年第4期6卷 438-444页

作者： Baisong Li Zhongli Ji Xue Yang China Univ Petr Sch Mech & Elect Engn Beijing 102249 Peoples R China

Fibrous filters are often used to remove contaminants including both dusts and liquid droplets from natural gas. This paper aims to evaluate the gas-liquid separation performance of three types of cartridge filters used in the West-East natural gas transmission project. The comparison of the original pressure drop of clean filters and the evolution of pressure drop as liquid droplets deposited in the filter media are described. The original pressure drops of these filters were similar but the pressure drops at a steady state were different. Fractional efficiency was used to study the separation performance of cartridge filters. Droplets at the outlet of the filters had small diameters, no more than 3 μm, but were very numerous. The effect of filtration velocity on gas-liquid separation performance was analyzed. Higher filtration velocity indicated better gas-liquid separation performance. Finally the quality factor related to pressure drop and filtration efficiency was applied to evaluate the gas-liquid separation performance.

关键词： Filtration natural gas gas-liquid separation fractional efficiency pressure drop