By Chang-New Chen

ISBN-10: 354028947X

ISBN-13: 9783540289470

ISBN-10: 3540311858

ISBN-13: 9783540311850

This booklet offers numerical differential quadrature (DQ) - dependent tools lately constructed by way of the writer. Their skill for fixing typical clinical and engineering difficulties is confirmed. those tools are the conventional differential quadrature, the prolonged differential quadrature and the comparable discrete aspect research tools. those novel numerical strategies are either effective and trustworthy. they're compatible for constructing resolution algorithms for varied computational mechanics issues of arbitrarily advanced geometry. this is often proven for numerous entire examples corresponding to bars and beams, trusses, frames, common box difficulties, elasticity difficulties or bending of plates.

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Additional resources for Discrete Element Analysis Methods of Generic Differential Quadratures

Example text

0 0 ¯ξ ¯ξ D 1(N −3) D1(N −2) 2 2 ¯ξ ¯ξ D 1(N −3) D1(N −2) 0 0 ... . . ... . 1 0 ... 0 0 ... ¯ ξ ¯ξ DN (N −3) D N (N −2) 2 2 ... ¯ ξ ¯ξ D D ... 14 2 ¯ ξ ... D 14 ... 1 . . 0 0 ¯ξ D N4 2 ¯ξ D N4 N (N −3) N (N −2) 0 0 ¯ξ D ⎤ ⎥ ¯ξ D 1N ⎥ 1(N −1) 2 2 ⎥ ξ ξ ¯ ¯ ⎥ D 1(N −1) D1N ⎥ 0 0 ⎥ ⎥ . ⎥ ⎥ . 115) . ⎥ ⎥ 0 0 ⎥ ⎥ 0 1 ⎥ ⎥ ¯ξ ¯ξ ⎥ D N (N −1) DN N ⎦ 2 2 ¯ξ ¯ξ D D N (N −1) NN Using [T ] in Eq. 113), the weighting coefficients for the C 2 − C 0 − ˆ = N ¯ − 4. For applying the C 2 − C EDQ model can be obtained with N 0 2 C − C EDQ model to the DQEM analysis, the physical first and second order derivatives at the two EDQ element boundary nodes are discrete EDQ ¯ − 1)th columns parameters.

1) where w is the transverse displacement, E is Young’s modulus, I is the moment of inertia of the cross-sectional area, p is the distributed load and k is the foundation modulus. 3) V = dx dx respectively. 1 DQEM Formulation For elements having no distributed load, the DOF of the element can be 4. Since Eq. 1) is a fourth order differential equation, without using a certain technique to calculate the four equivalent nodal loads for the distributed load of a four-DOF cubic element and include them into the natural transition conditions or natural boundary conditions, the order of approximate displacement must at least be four and the element must at least have one discrete point for defining a discrete element equilibrium equation at the discrete point.

0 1 0 ... 117) Using [T ] in Eq. 113), the weighting coefficients for the C 1 −C 0 EDQ model ˆ =N ¯ − 1. For applying the C 1 − C 0 EDQ model to can be obtained with N the transient structural analysis, the physical first order derivative at the first EDQ element boundary node is a discrete EDQ parameter. Consequently, the elements of the second column of the related EDQ weighting coefficient matrix ξm need to be multiplied by l. 5 The first four frequency factors of a clamped square plate solved by the DQEM using the C 1 − C 0 − C 1 EDQ model generated by using the equivalent DQ model with two auxiliary nodes inside the physical EDQ model Order of appr.

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Discrete Element Analysis Methods of Generic Differential Quadratures by Chang-New Chen


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