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71.
Janusz Holowaty 《计算机技术与应用:英文》2013,(11):592-598
This paper presents comparison of numerical models used in an analysis of a road bridge deck. The models were adapted for computing the live load distribution coefficients in composite concrete bridge deck. The load distribution method was chosen for assessment of the usability of different numerical model in slab bridge deck analysis. The goal of the study is to determine a simplest but still accurate numerical model to estimate live load effects on composite slab bridge. In the analysis, the well-established grillage approach was adapted for representation of the bridge deck as a basic model as well as more sophisticated three-dimensional models which was supposed to better represent the real behavior of the deck under concentrated wheel loads. The bridge deck was effectively modeled using beam and shell elements. The grillage method compares well with the finite-element method. This finding is allowed to establish simplification in numerical modeling of slab bridge decks for live load effect computations. 相似文献
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介绍了一种基于横向场激励模式的高频压电超声换能器及其设计、分析和制作过程。采用扩展的Christoffel-Bech-mann方法对LiNbO3、LiTaO3和PMN-33PT三种不同压电材料的a模式横向场压电耦合系数进行了计算,发现这三种材料中LiNbO3具有最大的LFE a模式压电耦合系数,为28%。采用具有最大压电耦合系数的X切LiNbO3设计并制作了基于横向场激励的高频超声换能器,并采用传统的Pulse-Echo方法测试了该超声换能器的中心频率和带宽。实验测得该LFE高频超声换能器的中心频率为34MHz,-6dB带宽为14.4%。从理论和实验上证明了横向场激励模式可以应用于高频超声换能器。 相似文献
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77.
K. Marti 《Computer Methods in Applied Mechanics and Engineering》2008,198(1):42-51
Problems from plastic analysis are based on the convex, linear or linearised yield/strength condition and the linear equilibrium equation for the stress (state) vector. In practice one has to take into account stochastic variations of several model parameters. Hence, in order to get robust maximum load factors, the structural analysis problem with random parameters must be replaced by an appropriate deterministic substitute problem. A direct approach is proposed based on the primary costs for missing carrying capacity and the recourse costs (e.g. costs for repair, compensation for weakness within the structure, damage, failure, etc.). Based on the mechanical survival conditions of plasticity theory, a quadratic error/loss criterion is developed. The minimum recourse costs can be determined then by solving an optimisation problem having a quadratic objective function and linear constraints. For each vector a(·) of model parameters and each design vector x, one obtains then an explicit representation of the “best” internal load distribution F∗. Moreover, also the expected recourse costs can be determined explicitly. Consequently, an explicit stochastic nonlinear program results for finding a robust maximal load factor μ∗. The analytical properties and possible solution procedures are discussed. 相似文献
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To improve the performance of scientific applications with parallel loops, dynamic loop scheduling methods have been proposed.
Such methods address performance degradations due to load imbalance caused by predictable phenomena like nonuniform data distribution
or algorithmic variance, and unpredictable phenomena such as data access latency or operating system interference. In particular,
methods such as factoring, weighted factoring, adaptive weighted factoring, and adaptive factoring have been developed based
on a probabilistic analysis of parallel loop iterates with variable running times. These methods have been successfully implemented
in a number of applications such as: N-Body and Monte Carlo simulations, computational fluid dynamics, and radar signal processing.
The focus of this paper is on adaptive weighted factoring (AWF), a method that was designed for scheduling parallel loops
in time-stepping scientific applications. The main contribution of the paper is to relax the time-stepping requirement, a
modification that allows the AWF to be used in any application with a parallel loop. The modification further allows the AWF
to adapt to load imbalance that may occur during loop execution. Results of experiments to compare the performance of the
modified AWF with the performance of the other loop scheduling methods in the context of three nontrivial applications reveal
that the performance of the modified method is comparable to, and in some cases, superior to the performance of the most recently
introduced adaptive factoring method.
相似文献
Ioana BanicescuEmail: |
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