Home / Journals / ICCES / Vol.2, No.4, 2007
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  • Open Access

    ABSTRACT

    About the POD Model Reduction in Computational Mechanics for Nonlinear Continuous Dynamical Systems

    R. Sampaio1, C. Soize2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.2, No.4, pp. 93-100, 2007, DOI:10.3970/icces.2007.002.093
    Abstract An analysis of the efficiency of the reduced models constructed using the POD-basis and the LIN-basis is presented in nonlinear dynamics for continuous elastic systems discretized by the finite element method. The POD-basis is the basis constructed with the POD method while the LIN-basis is the basis derived from the generalized eigenvalue problem associated with the underlying linear conservative part of the system and usually called the eigenmodes of vibration. The efficiency of the POD-basis or the LIN-basis is related to the speed of convergence in the frequency domain of the solution constructed with the reduced model with respect to… More >

  • Open Access

    ABSTRACT

    Stability Analysis of Beams Rotating on an Elastic Ring Application to Turbo machinery Rotor-Stator Contacts

    N. Lesaffre1, J-J. Sinou1, F. Thouverez1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.2, No.4, pp. 101-110, 2007, DOI:10.3970/icces.2007.002.101
    Abstract This paper presents a model of flexible beams rotating on the inner surface of an elastic stationary ring. The beams possesses two degrees of freedom, traction/compression and flexure. The in-plane deformations of the ring are considered and a single mode approximation is used. The model has been developed within the rotating frame by use of an energetic method. To better understand the phenomena occurring, the degrees of freedom of the beams can first be treated separately then together. Stability analysis show that even without rubbing, the radial degree of freedom of a beam rotating on an elastic ring can create… More >

  • Open Access

    ABSTRACT

    Review of existing numerical methods and validation procedure available for bird strike modelling

    M-A Lavoie1, A. Gakwaya1, M. Nejad Ensan2, D.G. Zimcik2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.2, No.4, pp. 111-118, 2007, DOI:10.3970/icces.2007.002.111
    Abstract This paper reviews numerical methods that are currently available to simulate bird strike as well as the theory of the event. It also summarizes important parameters and provides guidelines as to how to set up the analysis and how to evaluate a model. The information provided is based on physical properties and available results regarding a bird and its behaviour upon impact. The simulations have been performed with LS-DYNA 970 but can be done in similar dynamic finite elements analysis codes. More >

  • Open Access

    ABSTRACT

    Impact Performance of Nanophased Woven Fabric Carbon/Epoxy Composite Laminates

    M.V. Hosur1, F.H. Chowdhury1, S. Jeelani1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.2, No.4, pp. 119-124, 2007, DOI:10.3970/icces.2007.002.119
    Abstract In the present study, Nanomer® I-28E, organically modified montmorillonite nanoclay supplied by Nanocor Inc., was used to modify SC-15, a toughened epoxy system using sonication route. Different weight percentage ranging from 1-3% of nanoclay was used. The modified epoxy was then used to fabricate 15-layer plain weave carbon/epoxy composite laminates using vacuum assisted resin transfer molding (VARTM) method. Samples of size 100 x 100 mm were cut from the laminates and were subjected to low-velocity impact loading using an instrumented drop-weight system (Dynatup Model 8210) at three different energy levels of 10, 20 and 30J. Transient response of the samples… More >

  • Open Access

    ABSTRACT

    Transient Response Analysis of Viscoelastic Frames with the Method of Reverberation Ray Matrix

    Zhenguo Tu1, Fuxing Miao1, Guojun Sun1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.2, No.4, pp. 125-130, 2007, DOI:10.3970/icces.2007.002.125
    Abstract In this paper the reverberation ray matrix method, which was developed recently by Professor Pao and his colleagues for analyzing dynamic response of elastic trusses or frames, is extended and used to solve the transient response of frames made of viscoelastic bars. Originally for the solution of elastic structure the matrix (I-R)-1 is expanded into Neumann series to circumvent the difficulty of singularity in reversing the matrix in frequency domain. However, it is not necessary to expand this matrix since there is no singularity problem for viscoelastic frame due to viscous damping. The accuracy and effectiveness of applying reverberation ray… More >

  • Open Access

    ABSTRACT

    Control of Walking Robot by Inverse Dynamics of Link Mechanisms Using FEM

    S. Okamoto1, H. Noguchi2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.2, No.4, pp. 131-136, 2007, DOI:10.3970/icces.2007.002.131
    Abstract This paper presents a control of walking robot by using inverse dynamics of link mechanisms, which has already been proposed and applied in several in-plane motions. In this method, FEM is used for the discretization of equations of motion. This method calculates nodal forces by evaluating equations of motion in a matrix form, and thus information from the entire system can be handled efficiently, and the torques input to each joint of link mechanisms to achieve required motion are calculated easily. This method is suitable to the feed-forward control of closed-loop or continuously link mechanisms. In this paper, this inverse… More >

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