Home / Advanced Search

  • Title/Keywords

  • Author/Affliations

  • Journal

  • Article Type

  • Start Year

  • End Year

Update SearchingClear
  • Articles
  • Online
Search Results (25,094)
  • Open Access

    ARTICLE

    Steady-State Temperature Rise in Coated Halfspaces and Halfplanes

    Michael J. Rodgers1, Leon M. Keer, Herbert S. Cheng

    CMES-Computer Modeling in Engineering & Sciences, Vol.3, No.4, pp. 483-496, 2002, DOI:10.3970/cmes.2002.003.483

    Abstract The steady-state temperature rise due to frictional heating on the surface of coated halfspaces and halfplanes is described by closed form expressions in the Fourier transformed frequency domain. These frequency response functions (FRFs) include the effects of the coating and the speed of the moving heat source and apply for all Peclet number regimes. Analytical inversion of these expressions for several special cases shows the Green's functions as infinite series of images, which may be costly and slowly convergent. Also, the influence coefficients integrated from these Green's functions are not available in closed form. Applying… More >

  • Open Access

    ARTICLE

    Temperature Distributions and Thermoelastic Displacements In Moving Bodies

    Shuangbiao Liu, Michael J. Rodgers, Qian Wang, Leon M. Keer, Herbert S. Cheng1

    CMES-Computer Modeling in Engineering & Sciences, Vol.3, No.4, pp. 465-482, 2002, DOI:10.3970/cmes.2002.003.465

    Abstract Computing the temperature rise and thermoelastic displacement of a material subjected to frictional heating is essential for the realistic modeling of the performance of mechanical components. This paper presents a novel set of frequency-domain expressions for the surface temperature rise and the surface normal thermoelastic displacement of a moving three-dimensional elastic halfspace subjected to arbitrary transient frictional heating, where the velocity of the body and its direction can be an arbitrary function of time. Frequency response functions are derived by using the Carslaw-Jaeger theory, the Seo-Mura result, and the Fourier transform. General formulas are expressed More >

  • Open Access

    ARTICLE

    Thermohydrodynamic Analysis of Journal Bearings Lubricated with Multigrade Oils

    J.Y. Jang1, M.M. Khonsari2

    CMES-Computer Modeling in Engineering & Sciences, Vol.3, No.4, pp. 455-464, 2002, DOI:10.3970/cmes.2002.003.455

    Abstract Thermohydrodynamic analysis of journal bearings lubricated with multigrade oils is presented. Design charts are presented that enable one to readily estimate the bearing maximum temperature and the shaft temperature using a series of dimensionless parameters introduced in this paper. More >

  • Open Access

    ARTICLE

    Simulations of Scuffing Based on a Dynamic System Model

    Yuanzhong Hu1, Yuchuan Liu, Hui Wang

    CMES-Computer Modeling in Engineering & Sciences, Vol.3, No.4, pp. 447-454, 2002, DOI:10.3970/cmes.2002.003.447

    Abstract Scuffing, a major cause of failure in automobile engines, is considered as a dynamic process in this study. Local adhesions may occur randomly in lubricated contacts due to the existence of asperity contact and breakdown of lubricating films. Scuffing would take place if the local events develop rapidly into a large-scale plastic deformation and catastrophic failure. A system dynamic model established in the present paper allows one to predict dynamic behavior of a tribological system through numerical solutions of a group of differential equations. Results show that a transition to adhesion begins when the surface More >

  • Open Access

    ARTICLE

    Combining Lumped Parameter Bond Graphs with Finite Element Shafts in a Gearbox Model

    J. Choi1, M.D. Bryant2

    CMES-Computer Modeling in Engineering & Sciences, Vol.3, No.4, pp. 431-446, 2002, DOI:10.3970/cmes.2002.003.431

    Abstract This paper presents an updated bond graph model of a gearbox, which now includes bending of shafts. The gearbox system has an input shaft, layshaft, output shaft, spur gears, bearings, and housing. The bond graph model integrates separate sub-models into a composite model. Sub-modules include tooth-to-tooth contact, rotor dynamics of shafts, global dynamics of the gearbox housing structure, and shaft bending modeled by finite element modeling. The tooth-to-tooth model includes tooth bending; shaft torsion; gear inertia; conversion of gear torque into tooth forces; tooth contact mechanics; and multiple tooth contact. To analyze shaft dynamics more More >

  • Open Access

    EDITORIAL

    Virtual Tribology: Integrating Model-Based Simulations with Modern Computation/Information Technologies

    Q. Jane Wang1, Michael D. Bryant2, Leon M. Keer1, Richard F. Salant3

    CMES-Computer Modeling in Engineering & Sciences, Vol.3, No.4, pp. 417-430, 2002, DOI:10.3970/cmes.2002.003.417

    Abstract This article has no abstract. More >

  • Open Access

    ARTICLE

    A Green's Function for Variable Density Elastodynamics under Plane Strain Conditions by Hormander's Method

    George D. Manolis1, Stavros Pavlou2

    CMES-Computer Modeling in Engineering & Sciences, Vol.3, No.3, pp. 399-416, 2002, DOI:10.3970/cmes.2002.003.399

    Abstract A free-space Green's function for problems involving time-harmonic elastic waves in variable density materials under plane strain conditions is developed herein by means of Hormander's method in the context of matrix algebra formalism. The challenge when solving problems involving inhomogenous media is that the coefficients appearing in the governing equations of motion are position-dependent. Furthermore, an additional difficulty stems from the fact that these governing equations are vectorial, which implies that coordinate transformation techniques that have been successful with scalar waves can no longer be used. Thus, the present work aims at establishing the necessary More >

  • Open Access

    ARTICLE

    A 2-D Time-Domain BIEM for Dynamic Analysis of Cracked Orthotropic Solids1

    Ch. Zhang2

    CMES-Computer Modeling in Engineering & Sciences, Vol.3, No.3, pp. 381-398, 2002, DOI:10.3970/cmes.2002.003.381

    Abstract A 2-D time-domain boundary integral equation method (BIEM) for transient dynamic analysis of cracked orthotropic solids is presented in this paper. A finite crack in an unbounded orthotropic solid subjected to an impact loading is considered. Hypersingular time-domain traction boundary integral equations (BIEs) are applied in the analysis. A time-stepping scheme is developed for solving the hypersingular time-domain traction BIEs. The scheme uses a convolution quadrature formula for temporal and a Galerkin method for spatial discretizations. Numerical examples are given to show that the presented time-domain BIEM is highly efficient and accurate. More >

  • Open Access

    ARTICLE

    Computational Modeling of Shock and Impact Response of Alumina

    A. M. Rajendran1, D. J. Grove2

    CMES-Computer Modeling in Engineering & Sciences, Vol.3, No.3, pp. 367-380, 2002, DOI:10.3970/cmes.2002.003.367

    Abstract This paper presents detailed computational analyses investigating the ability of constitutive relationships to describe the response of a 99.5% pure alumina (AD995) subjected to a wide range of stress/strain loading states. Using a shock-wave-propagation-based finite element code, one and two-dimensional simulations were performed for the following shock and impact configurations: plate-on-plate impact; rod-on-rod impact; single-density plate-on-rod impact; graded-density plate-on-rod impact; and rod penetration into a thick plate. The detailed analyses presented in this paper include a model constant sensitivity study through comparisons of computed wave profiles with experimental measurements. More >

  • Open Access

    ARTICLE

    Modeling of Electric Double Layer Effects through Pressure-driven Microchannel Flows

    E.Y.K. Ng1, S.T. Poh 2

    CMES-Computer Modeling in Engineering & Sciences, Vol.3, No.3, pp. 351-366, 2002, DOI:10.3970/cmes.2002.003.351

    Abstract Advances in microfabrication technology have allowed the use of microchannels in ultra compact, very efficient heat exchangers, which capitalize on the channels large surface area to volume ratio, to transport high heat fluxes with small thermal resistances. One example is the cooling of microchips. However, research into microscale flow and heat transfer phenomena conducted by various researchers provided substantial experimental data and considerable evidence that the behaviour of fluid flow and heat transfer in microchannels without phase change may be different than that which normally occurs in larger more conventional sized channels.
    This paper describes… More >

Displaying 24971-24980 on page 2498 of 25094. Per Page