HHT结合颤振余量法在颤振边界预测中的应用
首发时间:2013-01-04
摘要:HHT是新提出的一种信号处理方法,与传统方法相比有许多优势。颤振余量法是一种经典的颤振边界预测方法。通过HHT法进行模态参数识别,得到不同风速下各阶模态的频率和阻尼,与MIMO法得到的频率和阻尼相比,更接近理论计算值。据此使用三自由度颤振余量法进行预测,所得颤振边界与MIMO法得到的颤振边界相比,更接近实验结果,说明了应用HHT结合颤振余量法于颤振边界预测的可行性与有效性。
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Application of HHT and Flutter Margin Method for Flutter Boundary
Abstract:HHT is a new signal processing approach, which has many advantages over traditional methods. Flutter margin method is a classic flutter boundary prediction method. HHT can be used to identify the modal frequency and damp at different speeds, and the result are more close to theoretical calculation than the outcome with MIMO. Based on the modal frequency and damp, the flutter boundary can be calculated with three degrees of freedom flutter margin method, which is closer to experimental result than the flutter boundary by MIMO. The result shows that HHT and flutter margin method is valid and effective on flutter boundary prediction.
Keywords: Hilbert-Huang Transformation modal parameter identification flutter prediction
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