计算力学学报2012，Vol.29Issue(1)：19-24,6.
基于SCI／ERA方法的高效气动力降阶模型
Efficient aero-dynamic reduced-order-model based on SCI/ERA method
窦怡彬 1徐敏 2Christian Breitsamter2
作者信息
- 1. 西北工业大学航天学院,西安710072／慕尼黑工业大学空气动力学研究所,慕尼黑85748
- 2. 西北工业大学航天学院,西安710072
- 折叠
摘要
Abstract
The Walsh-single-composite-input signals based on orthogonal Walsh function were simultaneously inputted into the CFD（Computational Fluid Dynamics） model,using SCI/ERA（Single-Composite- Input/Eigensystem Realization Algorithm） to identify a discrete-time-domain,unsteady aero-dynamic reduced-order-model（ROM） in state space formulation from CFD responses directly. The Isogai wing stand aeroelastic example was computed, and the results demonstrate that the SCI/ERA method decreases model＇s dimension in 2 orders while still maintains the same accuracy of unsteady CFD codes. Compared to Pulse/ERA method,it improves the computational efficiency by 24% and saves memory space by a4 %. Besides, the SCI/ERA method needs much less additional computational resources than Pulse/ERA method while increasing the coupled structure modes. The frequency-domain BPOD（Balanced Proper Orthogonal Decomposition） method can extract a low frequency second-reduced-order-model（SROM） from ROM while remains the same accuracy. The dimension of ROM further decreases by 88% after second order reduction.关键词
降阶模型/单信号-复合-输入／特征系统实现算法/平衡特征正交分解/二次降阶Key words
reduced-order-model/SCI/ERA/BPOD/second order reduction分类
航空航天引用本文复制引用
窦怡彬,徐敏,Christian Breitsamter..基于SCI／ERA方法的高效气动力降阶模型[J].计算力学学报,2012,29(1):19-24,6.
