Analysis Of Wing-type Structural Vibration Characteristics With The Influence Of Thermal Environment

Taking a wing structure under the thermal environment as the study object of this thesis, theinfluence of thermal stresses on the structural natural frequency is analyzed by using the method ofnumerical simulation and experimental validation. The main work is as follows:(1) The domestic and foreign scholars’ researches on the structure vibration characteristicsunder thermal environment are reviewed. The main factors which influence the structure vibrationcharacteristics under the thermal effect are analyzed. The thermal modal theoretical knowledge areexpounded, including engineering thermodynamics theory, finite element method, the basic theory ofelastic beam and plate vibration characteristics analysis and vibration test theory, which providetheoretical basis for the next research work.(2) The influence of thermal stresses on the wing structure natural frequencies is studied in thispaper. A wing structure is established by software of finite element analysis with Ansys Workbench,and the structure’s thermal stress distribution and vibration mode are calculated under the uniformtemperature field, the non-uniform temperature field and the non-uniform variable temperature field.According to the relationship between the thermal stress distribution and the structure vibration mode,analysis of the wing structure vibration frequency with the influence of thermal stresses. The resultsshow that as temperature rise the natural frequencies of the wing structure are on the decline when thethermal stresses are ignored, but the thermal stress are tensile stress in a certain order natural vibration,and the add heat stress stiffness matrix take the leading role, this will make this order naturalfrequencies rising(3) A thermal modal experiment scheme is set up based on the laser non-contact measurement.The thermal modal test of the wing structure is finished by using high temperature electric heating.The structure vibration signals are sampled by laser vibrometer with high temperature heatingcondition, and the thermal modal experiment scheme feasibility is validated.