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排序方式: 共有107条查询结果,搜索用时 46 毫秒
91.
简支方板在弹性基础上的塑性动力响应 总被引:3,自引:2,他引:3
用加权残值法中的矩量法解简支方板塑性动力响应,分析弹性基础对方板塑性动力响应的影响,解出了弹性基础上方板残余挠度和终止运动时间。 相似文献
92.
Huang Zaixing 《Acta Mechanica Solida Sinica》1996,9(4):350-356
In this paper, two fundamental problems completely unsolved in nonlocal field theory are studied. The first is the dependence of nonlocal residuals. By studying this problem, a theorem concerning the relationship between the residuals of nonlocal body force and nonlocal moment of momentum is given and proven. The other problem is how to give the stress boundary conditions in the linear theory of nonlocal elasticity. The stress boundary conditions obtained in this paper can not only answer why the nonlocal stress solution satisfying the boundary conditionst
ji
(s)
n
j
¦O
2 =p
i
(p
i
is a constant) on the surface of crack does not exist but also give a model of the molecular cohesive stress on the crack tip. 相似文献
93.
A theoretical approach is presented that uses multiple strain gages to accurately measure complicated strain distributions.
The technique is based on the method of weighted residuals in conjunction with measured strain data and is applicable for
arbitrary in-plane strain distributions. Conventional measurements using strain gages are shown to represent a particular
case of the approach presented. The experimental characterization of unidimensional strain fields is discussed in detail.
Two approaches are presented; these are based on linear and quadratic approximations of the strain field. The strain distribution
for two important practical problems is evaluated assuming ideal conditions to assess the performance of the proposed approach.
In both cases, the simulated results demonstrate that measurement error resulting from the finite size of a strain gage may
be reduced. That is, a larger strain gage may be used for a given maximum admissible error. The method also allows a minimal
error of measured nonlinear strains. 相似文献
94.
This paper proposes statistical procedures to check if a real-valued covariate X has an effect on a functional response Y(t). A non-parametric kernel regression is considered to estimate the influence of X on Y(t) and two test statistics based on residual sums of squares and smoothing residuals are proposed. Their acceptance levels
are determined by means of permutations. The lack-of-fit test for a class of parametric models is then discussed as a consequence
of the no effect procedure. Monte Carlo simulations provide an insight into the level and the power of the no effect tests.
A study of atmospheric radiation illustrates the behavior of the proposed methods in practice. 相似文献
95.
A. K. Alekseev S. V. Zhurin 《Computational Mathematics and Mathematical Physics》2006,46(9):1623-1628
The possibility is explored of creating a postprocessor for a posteriori error estimation of computed target functionals based on the residual generated by a high-accuracy stencil and adjoint parameters as applied to a numerical solution. The applicability of this approach to the supersonic Euler equations is confirmed by computing the density at a control point. 相似文献
96.
Ying YANG Department of Mathematical Sciences Tsinghua University Beijing P.R.China 《应用数学学报(英文版)》2004,(4)
Consider the standard non-linear regression model y_i=g(x_i,θ_0) ε_j,i=1,...,n whereg(x,θ) is a continuous function on a bounded closed region X×θ_0 is the unknown parametervector in R~p,{x_1,x_2,...,x_n} is a deterministic design of experiment and {ε_1,ε_2,...,ε_n} is asequence of independent random variables.This paper establishes the existences of M-estimates andthe asymptotic uniform linearity of M-scores in a family of non-linear regression models when theerrors are independent and identically distributed.This result is then used to obtain the asymptoticdistribution of a class of M-estimators for a large class of non-linear regression models.At the sametime,we point out that Theorem 2 of Wang (1995) (J.of Multivariate Analysis,vol.54,pp.227-238,Corrigenda.vol.55,p.350) is not correct. 相似文献
97.
The Birnbaum‐Saunders (BS) distribution is a model that frequently appears in the statistical literature and has proved to be very versatile and efficient across a wide range of applications. However, despite the growing interest in the study of the BS distribution, quantile regression modeling has not been considered for this distribution. To fill this gap, we introduce a class of quantile regression models based on the BS distribution, which allows us to describe positive and asymmetric data when a quantile must be predicted using covariates. We use an approach based on a quantile parameterization to generate the model, permitting us to consider a similar framework to generalized linear models, providing wide flexibility. The methodology proposed includes a thorough study of theoretical properties and practical issues, such as maximum likelihood parameter estimation and diagnostic analytics based on local influence and residuals. The performance of the residuals is evaluated by simulations, whereas an illustrative example of income data is conducted using the methodology to show its potential for applications. The numerical results report an adequate performance of the approach to quantile regression, indicating that the BS distribution is a good modeling choice when dealing with data that have both positive support and asymmetry. The economic implications of our investigation are discussed in the final section. Hence, it can be a valuable addition to the tool kit of applied statisticians and econometricians. 相似文献
98.
The paper investigates the sequential observations’ variance change in linear regression model. The procedure is based on a detection function constructed by residual squares of CUSUM and a boundary function which is designed so that the test has a small probability of false alarm and asymptotic power one. Simulation results show our monitoring procedure performs well when variance change occurs shortly after the monitoring time. The method is still feasible for regression coefficients change or both variance and regression coefficients change problem. 相似文献
99.
This paper presents nonparametric tests of independence that can be used to test the independence of p random variables, serial independence for time series, or residuals data. These tests are shown to generalize the classical portmanteau statistics. Applications to both time series and regression residuals are discussed. 相似文献
100.
Janusz Kawczak Reg Kulperger Hao Yu 《Annals of the Institute of Statistical Mathematics》2005,57(4):747-765
The weak convergence of the empirical process and partial sum process of the residuals from a stationary ARCH-M model is studied.
It is obtained for and
consistent estimate of the ARCH-M parameters. We find that the limiting Gaussian processes are no longer distribution free
and hence residuals cannot be treated as i.i.d. In fact the limiting Gaussian process for the empirical process is a standard
Brownian bridge plus an additional term, while the one for partial sum process is a standard Brownian motion plus an additional
term. In the special case of a standard ARCH process, that is an ARCH process with no drift, the additional term disappears.
We also study a sub-sampling technique which yields the limiting Gaussian processes for the empirical process and partial
sum process as a standard Brownian bridge and a standard Brownian motion respectively. 相似文献