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Vortex fan jet engine vibration diagnosis and improved

This phenomenon in the aircraft design must be a clear understanding in order to avoid the critical speed close to the aircraft engine cruising speed, causing undue vibration and noise appear. This study also showed that the prototype aircraft manufactured, the combination of field testing and computer simulation of vibration, the engine mechanical model with appropriate modifications, can be found in real dynamic characteristics of the engine and the origin of vibration and noise. Modify the engine main bearing design, and raise squeeze film damper bearing damping is provided by two more economical and feasible solutions for dynamic correction of the engine thus reducing vibration and noise. The U.S. has used them successfully to solve the aforementioned problems. References 1ParkJG, FangZ, GunterEJ. Vibrationanalysisofajetaircraftengine. SEASReportNo: UVA/538603/MANE94/101tDept. ofMechanical, AerospaceandNuclearEngineering, UniversityofVir-glnia, Chariottesville, VA22903. USA, 19942ChenWJ. DYRoBES-dynamicsofrotorbearingsystemusersmanualVersion20,[link widoczny dla zalogowanych], DynamicEreganee, AZ85226, USAt19923GunterEJ,[link widoczny dla zalogowanych], BarrettLE, AltairePE. Designofnontinearsqueege-filmdampersforaircraftengines. AEJourna1ofLubricationTechnology,[link widoczny dla zalogowanych], 1977; 0g (1)} 57 - 644PetersonPT. Forwardprecessionandbackwardprecession. 1ngenieurArchly, 1972; 42 (1) :26-41VibrationDiagnosisandImprovementofaJetAircraftTurbofanEngineFangZhichu (Dept.ofEngineeringMechanics,[link widoczny dla zalogowanych], Shanghai] iaotongUniversityShanghai, 200030) AbstractThispaperclarifiesvibrationdiagnosisofanewJetaircraftturbofanenginebyrtleansofdynamicanatysisandfietdtesttitisfoundthatthetendencyofturbinewheeltobecomeflexiblecanleadtogreatdecreaseinitspolarlq. tortlent. finertiaThen · thcdynamicbehavioroftheenginewitlbechangedandoneormoreofitscriticalspeedsmaybeclosetothecruisingrotatingspeedOfthenew】 etaircraftThus, aYiunsatisfactorynoiserevelarisesfromthestrongvibrationoftheengineduringcruisingflightoftheprototype. Fwoeffectiveimprovementmeasuresarepresented,[link widoczny dla zalogowanych], andhavebeenacceptedbythemanufacturerKeywords: Jetaircraft; turbofanengine1vibrationdiagnosisifieldtest of the male side of the Chu. Ph.D, Associate Professor, 1944.

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