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Nonlinear phase separation testing of an experimental wing-engine structure

機(jī)譯:實(shí)驗(yàn)機(jī)翼發(fā)動(dòng)機(jī)結(jié)構(gòu)的非線(xiàn)性相分離測(cè)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 contribution 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(jī)譯:非線(xiàn)性工程結(jié)構(gòu)的模態(tài)測(cè)試是目前引起廣泛關(guān)注的研究領(lǐng)域。近來(lái),已經(jīng)提出了相分離測(cè)試的非線(xiàn)性概括,用于基于輸入和輸出測(cè)量來(lái)識(shí)別非線(xiàn)性正常模式(NNM)。非線(xiàn)性相分離(NPS)方法集成了識(shí)別和連續(xù)工具,可以根據(jù)寬帶數(shù)據(jù)計(jì)算多個(gè)NNM。本文稿報(bào)告了NPS方法的第一個(gè)實(shí)驗(yàn)應(yīng)用。感興趣的結(jié)構(gòu)是一個(gè)模型,該模型的靈感來(lái)自帶有兩個(gè)引擎的機(jī)翼,該引擎通過(guò)具有軟化-硬化剛度特性的非線(xiàn)性?huà)旒苓B接。估計(jì)了0-100 Hz范圍內(nèi)的四個(gè)NNM的頻率能量依賴(lài)性,包括模態(tài)相互作用。使用NPS方法確定的NNM也將與自由衰減測(cè)試結(jié)果進(jìn)行比較。

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