Content area
Beam-type structures used in aerospace applications may experience simultaneous broadband dynamic excitation and thermal loads. Design sensitivity, as a powerful tool for structural optimization and reliability analysis, is investigated in this work. The broadband dynamic response and its sensitivity to input parameters for a Euler–Bernoulli beam in a thermal environment are examined using an efficient wave-based method (WBM). First, the accuracy of the simulation for predicting the broadband dynamic response is validated. Then, the influence of thermal effects on the dynamic response is investigated. Further, the normalized sensitivities of the dynamic response with respect to thermal loads, material properties, and geometric parameters are studied. The simulation results highlight the critical role of thermally generated compressive forces in governing structural dynamics. The normalized sensitivities with respect to different input parameters can vary across the broadband frequency band. In the low-frequency ranges, the sensitivities with respect to thermal load, thermal expansion coefficient, the cross-section area, and moment of inertia are dominant. In the high-frequency ranges, the cross-section area, moment of inertia, elastic modulus, and density have major influence on the dynamic response. All the parameters investigated could significantly affect the mid-frequency dynamic response.
Details
Reliability analysis;
Electrons;
Dynamic response;
Statistical energy analysis;
Material properties;
Sensitivity analysis;
Parameter identification;
Parameter sensitivity;
Optimization;
Frequency ranges;
Frequencies;
Broadband;
Thermal expansion;
Aerospace engineering;
Boundary conditions;
Euler-Bernoulli beams;
Vibration;
Thermal analysis;
Cross-sections;
Modulus of elasticity;
Acoustics;
Moments of inertia;
Thermal environments;
Temperature effects;
Statistical methods
1 School of Mechanical Engineering, Southeast University, Nanjing 211189, China, National Key Laboratory of Aerospace Flight Technology, Beijing 100074, China
2 School of Mechanical Engineering, Southeast University, Nanjing 211189, China
3 National Key Laboratory of Strength and Structural Integrity, Aircraft Strength Research Institute of China, Xi’an 710065, China
4 School of Mechanical Engineering, Southeast University, Nanjing 211189, China, National Key Laboratory of Strength and Structural Integrity, Aircraft Strength Research Institute of China, Xi’an 710065, China