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Nonlinear Phase Separation Testing of an Experimental Wing-Engine Structure

機譯:實驗機翼發(fā)動機結(jié)構(gòu)的非線性相分離測試

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摘要

Modal testing of nonlinear engineering structures is currently a research area that attracts substantial attention. Recently, a nonlinear generalisation of phase separation testing has been proposed for identifying nonlinear normal modes (NNMs) based on input and output measurements. The nonlinear phase separation (NPS) method integrates identification and continuation tools to calculate multiple NNMs from broadband data. The present contributionr reports the first experimental application of the NPS method. The structure of interest is a model inspired by a wing with two engines connected by means of nonlinear pylons with softening-hardening stiffness characteristics. The frequency-energy dependences of four NNMs in the 0-100 Hz range are estimated, including modal interactions. NNMs identified using the NPS method are also compared to free-decay testing results
機譯:非線性工程結(jié)構(gòu)的模態(tài)測試是目前引起廣泛關(guān)注的研究領(lǐng)域。近來,已經(jīng)提出了相分離測試的非線性概括,用于基于輸入和輸出測量來識別非線性正常模式(NNM)。非線性相分離(NPS)方法集成了識別和連續(xù)工具,可以根據(jù)寬帶數(shù)據(jù)計算多個NNM。本貢獻者報告了NPS方法的第一個實驗應(yīng)用。感興趣的結(jié)構(gòu)是一個模型,該模型的靈感來自帶有兩個引擎的機翼,該引擎通過具有軟化-硬化剛度特性的非線性掛架連接。估計了0-100 Hz范圍內(nèi)的四個NNM的頻率能量依賴性,包括模態(tài)相互作用。還將使用NPS方法識別的NNM與自由衰減測試結(jié)果進行比較

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