论文标题
基于拓扑衍生物的多项式尺寸分解框架,用于高维复合系统的随机拓扑敏感性分析和一种基准问题
A polynomial dimensional decomposition framework based on topology derivatives for stochastic topology sensitivity analysis of high-dimensional complex systems and a type of benchmark problems
论文作者
论文摘要
在本文中,提出了一个基于拓扑导数概念的新计算框架,用于评估复杂系统的随机拓扑敏感性。旨在处理高维随机输入的拟议框架吻合多项式尺寸分解(PDD)多变量随机响应函数和确定性拓扑衍生物。一方面,它提供了分析表达式来计算前三个随机矩的拓扑敏感性,这些拓扑敏感性通常在健壮的拓扑优化(RTO)中需要。另一方面,它提供了嵌入式蒙特卡洛模拟(MCS)和有限差异公式,以估计基于可靠性的拓扑优化(RBTO)的失败概率的拓扑敏感性。对于这两种情况,不确定性的量化及其拓扑敏感性都是通过单个随机分析同时确定的。此外,首次开发了两个随机变量的原始示例,以获取分析解决方案,以实现矩和故障概率的拓扑敏感性。构建了另一个53维示例,用于分析矩的拓扑敏感性和失败概率的拓扑敏感性的半分析解决方案,以验证提出的高维情况方法的准确性和效率。这些示例是新的,使研究人员有可能基准对现有算法或新算法的随机拓扑敏感性。此外,据宣布,在某些条件下,所提出的方法比随机数量本身获得了随机拓扑敏感性更好的准确性。
In this paper, a new computational framework based on the topology derivative concept is presented for evaluating stochastic topological sensitivities of complex systems. The proposed framework, designed for dealing with high dimensional random inputs, dovetails a polynomial dimensional decomposition (PDD) of multivariate stochastic response functions and deterministic topology derivatives. On one hand, it provides analytical expressions to calculate topology sensitivities of the first three stochastic moments which are often required in robust topology optimization (RTO). On another hand, it offers embedded Monte Carlo Simulation (MCS) and finite difference formulations to estimate topology sensitivities of failure probability for reliability-based topology optimization (RBTO). For both cases, the quantification of uncertainties and their topology sensitivities are determined concurrently from a single stochastic analysis. Moreover, an original example of two random variables is developed for the first time to obtain analytical solutions for topology sensitivity of moments and failure probability. Another 53-dimension example is constructed for analytical solutions of topology sensitivity of moments and semi-analytical solutions of topology sensitivity of failure probabilities in order to verify the accuracy and efficiency of the proposed method for high-dimensional scenarios. Those examples are new and make it possible for researchers to benchmark stochastic topology sensitivities of existing or new algorithms. In addition, it is unveiled that under certain conditions the proposed method achieves better accuracies for stochastic topology sensitivities than for the stochastic quantities themselves.