Open Access
ABSTRACT
Yang Cheng, Bin Jia, Ming Xin
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.2, pp. 33-34, 2011, DOI:10.3970/icces.2011.016.033
Abstract A sparse grid approach to orbit uncertainty propagation is presented. Efficient and accurate uncertainty propagation methods for nonlinear dynamic systems have been of enormous interest to space object tracking. Recent methods include those based on the time evolution of the probability density function, the statistical moments, the random samples, or a sum of Gaussian components. The idea of the sparse grid method for orbit uncertainty propagation is to represent the initial uncertainty by a sparse grid, propagate the sparse grid points individually through the nonlinear orbit dynamics, and compute the statistical moments from the propagated sparse grid points. The Smolyak… More >
Open Access
ABSTRACT
Haofeng Chen
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.2, pp. 35-36, 2011, DOI:10.3970/icces.2011.016.035
Abstract In this paper a state-of-the-art numerical method is discussed for the evaluation of the shakedown and ratchet limits for an elastic-perfectly plastic body subjected to cyclic thermal and mechanical load history. The limit load, i.e. the load carrying capacity, is also determined as a special case of shakedown analysis. These design limits in plasticity have been solved by characterising the steady cyclic state using a general cyclic minimum theorem. For a prescribed class of kinematically admissible inelastic strain rate histories, the minimum of the functional for these design limits are found by a programming method, the Linear Matching Method (LMM),… More >
Open Access
ABSTRACT
Xiaoyang LU, Bingtao TANG
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.2, pp. 37-38, 2011, DOI:10.3970/icces.2011.016.037
Abstract Bending movements will be caused when elements passing by die entrance radius. The classical inverse analysis method (CIAM) uses the constitutive equation based on deformation theory of plasticity. Based on the assumption of the proportional loading, Hencky deformation theory is adopted. The secant modulus is obtained from uniaxial tensile curve and the plastic strain rate can be directly integrated to obtain a total plastic strain expression. The CIAM of sheet metal stamping has the shortcomings of no consideration of the effects of deformation history on stress prediction. Therefore, there is some discrepancy between the stress calculated with CIAM and that… More >
Open Access
ABSTRACT
Myung Jo Jhung, Yong Ho Ryu
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.2, pp. 39-40, 2011, DOI:10.3970/icces.2011.016.039
Abstract Korea is developing one of advanced small and medium-sized reactor called SMART (System-integrated Modular Advanced ReacTor), an integral type pressurized water reactor with the thermal power of 330 MW, by combining innovative safety features and its own indigenous technologies with proven light water reactor technologies. The reactor assembly of SMART contains major primary systems such as fuel and core, 8 steam generators, a pressurizer, 4 main coolant pumps, and 25 control rod drive mechanisms in a single pressurized reactor vessel. The integrated arrangement of these components enables the removal of the large size pipe connections between major components of reactor… More >
Open Access
ABSTRACT
Sukumar Srikant, Maruthi Akella
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.2, pp. 41-42, 2011, DOI:10.3970/icces.2011.016.041
Abstract We investigate state observer design for systems endowed with shared-sensing and control through reversible transducers. In this framework, reversible transducers are continually switched between the actuation and sensing modes at some specified schedule. Design and analysis of stable state-observers and feedback controllers for these classes of switched/hybrid systems are significantly complicated by the fact that at any given instant of time, the overall system loses either controllability (during the sensing phase) or observability (during the actuation phase). In this work, we consider linear systems with a single shared-sensing (reversible) transducer and provide a novel observer that guarantees exponential reconstruction of… More >
Open Access
ABSTRACT
Yan-Bin Jia
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.2, pp. 43-44, 2011, DOI:10.3970/icces.2011.016.043
Abstract The robot hand applying force on a deformable object will result in a changing wrench space due to the varying shape and normal of the contact area. Design and analysis of a manipulation strategy thus depend on reliable modeling of the object's deformations as actions are performed. The first part of this talk is concerned with modeling of shell-like objects grasped by a robot hand. We present a formulation of extensional, shearing, and bending strains in terms of geometric invariants including the principal curvatures and vectors, and their related directional and covariant derivatives. A computational procedure is then offered for… More >
Open Access
ABSTRACT
Lu Xiaoyang, Zhang Hao, Lu Xiaoli
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.2, pp. 45-46, 2011, DOI:10.3970/icces.2011.016.045
Abstract The elbow pipe is the crucial component of the piping system in many engineering fields such as metallurgical industry, material industry, petrochemical industry and chemical industry. Under high temperature and pressure (bulky flux, high velocity of flow) conditions, the non-uniformity of pressure loads has intensified the stress concentration in elbow pipe position. Meanwhile, it occurs obviously in destruction and expiration due to the disfigurement of manufactural technics and partial intensity insufficient. Therefore, the analysis of flow characteristics for elbow and the calculation formula of pressure in elbow are of important theoretical significance and applied value.
After an analytical overview… More >
Open Access
ABSTRACT
Tomasz Kubiak, Mariusz Urbaniak
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.2, pp. 47-48, 2011, DOI:10.3970/icces.2011.016.047
Abstract The paper deals with static and dynamic buckling of thin-walled C-shape girders subjected to compression or/and bending pulse loading with different pulse shape. The rectangular, trapezoidal and triangular shape of pulse have been considered. The employed pulse duration is comparable with period of natural vibration.
The unidirectional fibre composite material was modelled as orthotropic one. The material properties was designed using theory of mixture. The dynamic behaviour of such structures subjected to bending or/and compression have been under analysis. To investigate the local dynamic buckling only one segment of girders was taken into consideration.
For finding the critical… More >
Open Access
ABSTRACT
ZHANG Hong-tao1, ZHAO Yu-fei2, Wang Xiao-chun1, Liu Ying-hua3
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.2, pp. 49-50, 2011, DOI:10.3970/icces.2011.016.049
Abstract This paper is to study the stability of jointed rock slope using the Goodman joint element and upper bound limit analysis. Assumed the constitutes of rock masses, rock block and joint, obey perfect rigid plasticity and Mohr-Coulomb yield criterion, an upper bound finite element formulation is build to study the stability analysis of jointed rock slope using the Goodman joint element. A nonlinear mathematical programming is formulated with equation constraints and the loading factor of external load or self-weight as the objective function, and a direct iterative algorithm is constructed to solve it. Numerical results are given to illustrate the… More >
Open Access
ABSTRACT
Zhenhan Yao, Yintao Wei
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.2, pp. 51-52, 2011, DOI:10.3970/icces.2011.016.051
Abstract Shape optimization is very important in many engineering fields. As conventional engineering design, the shape optimization is generally based on the finite element analysis. Because many engineering strutures are related to different nonlinear problems in their working state, the analysis for each design sample is quite time consuming. For example for the shape optimization of automotive tires, it is related to the geometrical, material nonlinearity, and boundary nonlinearity caused by the contact problem. Therefore, the finite element analysis combined with sensitivity analysis to get more information for each design sample is a strategy usually adopted. For the sensitivity analysis, the… More >
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