摘 要: | 1IntroductionNonlilleargenerationandpropagationofacousticwavswithinatwo-dimensionalrectan-gularducthavedrawnmoreandmoreattention,andhavebeendiscussedilltensivelyinthepastdecades.Yetmuchattentionwasdrawntothecaseinwhichacousticwaveswithintheductwereexcitedbyanexcitationsourcewithasinglefrequency[1-4].Inpracticalissues,however,theexcitationsourcemayincludetwoormorefrequencies,andaseriesofacousticpropagatingmodeswithdifferentfrequencieswillbegenerated.Duetothenonlinearityoffiuidmediumwithintheduc…
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