Download PDF by Zhi Zong: Advanced Differential Quadrature Methods (Chapman & Hall/CRC

By Zhi Zong

ISBN-10: 1420082485

ISBN-13: 9781420082487

The e-book used to be very fascinating for me as my PhD thesis are hooked up with differential quadrature (DQ). It includes fairly new informations approximately improveing of the DQM. It base on authors articles from numerous final years. The unfavorable is that the articles are shorten, so occasionally you'll want to search for them within the booklet information base to discover information. occasionally it's not so transparent clarify from the place the autors receive there formulation [there might be extra references to literature] - occasionally it's attainable to discover theorems that healthy even beter to the topic. besides i'm more than pleased to have this booklet because it supplies me much convenient informations approximately instructions of the DQ proposal improve.

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Additional resources for Advanced Differential Quadrature Methods (Chapman & Hall/CRC Applied Mathematics & Nonlinear Science)

Example text

D) DQEM (Malik and Bert, 1996) and GDQR (Wang and Gu, 1997) The essence of DQEM and GDQR are that two degrees of freedoms, namely, (1) (1) w1 ,w1 ,wN ,wN , are used at the end points to handle the two boundary conditions. Since Hermit type polynomials, instead of Lagrangian polynomials, are used in determination of the weighting coefficients, the method differs from the conventional DQ method. Let aij , bij , cij , dij be the weighting coefficients of the first-, second-, third-, and fourth-order derivatives of the DQEM or GDQR, and N the number of nodes.

43) are sensitive to how nodes are distributed. If nodes are uniformly distributed, it does not converge to the true function as N → ∞. 3 through Runge example. So, uniform spacing of nodes may lead to disastrous consequences. Among non-uniform spacing of nodes which ensure the convergence of Eqs. 43), the Chebyshev nodes defined by Eq. 17) are nearly optimal. 20) ensures that Eq. 36) defined on Chebyshev nodes converges to the true function. Nodal distribution defined by Eq. 48) is most frequently employed in various DQ formulations.

1. 1: The 5th-order interpolating polynomial vs exact function. 03846 On plotting the fifth-order interpolating polynomial and the given function in Fig. 1, we immediately conclude that the two sets of results do not match well. Except at the six given points, the interpolating polynomial is far away from the true values. 25, 1]. We may consider choosing more points in the interval [-1, 1] to get a better match, but it diverges even more. 726 < x <1. How much can we improve the situation if Chebyshev nodes are used?

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Advanced Differential Quadrature Methods (Chapman & Hall/CRC Applied Mathematics & Nonlinear Science) by Zhi Zong


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