Home / Journals / ICCES / Vol.6, No.4, 2008
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  • Open Access

    ABSTRACT

    FE-Simulation of Nonlinear Vibration and Stability Control of Smart Structures

    S. Lentzen1, R. Schmidt1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.6, No.4, pp. 201-206, 2008, DOI:10.3970/icces.2008.006.201
    Abstract In the present work the significance of considering geometrical nonlinearity in the application of piezoelectric materials in order to improve the dynamic and stability characteristics of thin structures is shown. For the numerical investigations a finite shell element has been used which employs strain displacement relations based on the first-order shear deformation moderate rotation theory. An ANS formulation has been used to overcome membrane and shear locking. Two numerical examples are shown. The first example deals with increasing the critical buckling load by incorporating piezoelectric layers into the structure. In the second example the nonlinear vibrations of a cantilevered beam… More >

  • Open Access

    ABSTRACT

    Magnetoplastic Effect in Nonmagnetic Materials:\\ Experimental Studies and Computer Simulations

    V.I. Alshits1,2, R.K. Kotowski1,3, P. Tronczyk1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.6, No.4, pp. 207-214, 2008, DOI:10.3970/icces.2008.006.207
    Abstract The magnetoplastic effect manifests itself in a transformation of the structure of the impurity pinning centers in crystals exposed to an external magnetic field which modifies their mechanical properties. As a result, an ordinary nonmagnetic crystal becomes a smart material whose physical properties may be controlled by means of the external magnetic treatment. The basic features of this phenomenon and its established physical mechanisms are discussed. A series of results of experimental studies and computer simulations of the magnetoplastic effect are presented. More >

  • Open Access

    ABSTRACT

    Physiological Cost Optimization for Bipedal Modeling with Optimal Controller Design

    A. M. Mughal1, K. Iqbal2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.6, No.4, pp. 215-220, 2008, DOI:10.3970/icces.2008.006.215
    Abstract Human voluntary movements are complex physical phenomenon and there are several physiological factors that control the movement and transient response, steady state position, speed of motion and other characteristics. Many experimentalists described variety of variables important for human balance and movement such as center of mass, center of pressure, ground reaction forces etc. In this study, we discuss a bipedal model for biomechanical sit to stand movement with optimal controller design. The cost optimization for gain scheduling is based upon physiological variables of center of mass, head position, and ground reaction forces. Our simulation results shows that movement profiles improve… More >

  • Open Access

    ABSTRACT

    Optimum Design of Worm Gears with Multiple Computer Aided Techniques

    Daizhong Su1, Wenjie Peng2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.6, No.4, pp. 221-228, 2008, DOI:10.3970/icces.2008.006.221
    Abstract Finite element analysis (FEA) has proved to be a useful method to analyse the strength of worm gears; however, it is usually time consuming and difficult for parametric design, and, hence, it is difficult to apply FEA for design optimisation. To overcome this problem, artificial neural network and genetic algorithm are utilised in this research to optimise worm gear design based on FEA results. A new type of worm drive, an involute cylindrical worm matting with an involute helical gear, is taken as an vehicale to illustrate the approach developed. More >

  • Open Access

    ABSTRACT

    Vibro-Acoustic Prediction by Mechanical Impedance Method

    SAKO Fumiko1, ADACHI Yukihiro1, SHI Qinzhong2, ANDO Shigemasa2, TSUCHIHASHI Masahiro2, HAGIWARA Ichiro3
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.6, No.4, pp. 229-232, 2008, DOI:10.3970/icces.2008.006.229
    Abstract Satellite equipment experience severe high random acoustic loads during launch phase. [1\hbox {}] Accurate prediction of this random vibration is demanded to prevent equipmtnt from trouble. In this paper, a new approach for vibro-acoustic coupling analysis is proposed to obtain more accurate prediction. The proposed method applies Mechanical Impedance Method to vibro-acoustic coupling analysis with FEM model of structure and SEA model of sound system. \newline The analysis of simple model is conducted to study the proposed method. The result from the comparison shows this method provides more accurate prediction with structure impedance calculated from area-excitation analysis than from point-excitation… More >

  • Open Access

    ABSTRACT

    RFID-Solution for Optimizing the Logistic of an Assembly Line for Agricultural Machinery

    M. Baldinger1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.6, No.4, pp. 233-238, 2008, DOI:10.3970/icces.2008.006.233
    Abstract The aim of this paper is to demonstrate how the new highest technology can be used to develop and optimize the manufacturing plant. Based on the results of a preliminary study and other observations made during the last year, it was decided to bring a new technology in its factory. On the basis of climbing demand and the ever bigger nascent variety with the production of self loading wagons, the machine-factory is modernized by a mounting-street for self loading wagons. The use of RFID-technology, tied into an ERP-System, led to a clear optimization of the production-process. More >

  • Open Access

    ABSTRACT

    Multilevel Incomplete Factorizations for Non-Linear FE problems in Geomechanics

    C. Janna1, M. Ferronato1, G. Gambolati1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.6, No.4, pp. 239-244, 2008, DOI:10.3970/icces.2008.006.239
    Abstract The geomechanical simulation of a faulted producing reservoir is a strongly non-linear problem due to the non-elastic behaviour of the depleted rocks and especially to the contact constraint prescribed on the fault surfaces. With penalty interface elements for the fault modeling the stiffness matrix may be severely ill-conditioned and the solution by the Preconditioned Conjugate Gradient requires the development and the implementation of ad hoc preconditioners. The present communication investigates the performance of a multilevel incomplete factorization aimed at enhancing convergence and reducing the computational cost of a non-linear geomechanical simulation. More >

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