Design and Manufacture of Similar Model of Folding Wings and Study on Dynamic Characteristics

The research on full-size folding wings is limited by many factors, and the similar model has an irreplaceable role in its development and manufacturing process. In this study, a folding wing with core board and dimensional structure is designed and manufactured based on the principle of functional similarity and structural similarity, and the similar model can accomplish continuous folding from 0° to 90°. Based on the designed model, the finite element model simulation calculation and ground knocking modal test are completed, and the correction of the finite element model (FEM) is completed by comparing the test and simulation data. Finally, the full-component finite element model with small vibration frequency error and high matching of vibration MAC value is obtained and compared with the manufactured model. Since the gradient analysis of the full-component finite element model is extremely inefficient, a fast method of building the finite element model is proposed based on the simplified finite element model as a case study, which not only improves the efficiency of the FEM modeling and simulation analysis without changing the model structure and function, but also provides a good agreement of the vibration mode compared with the test data. In addition, the influence of the geometric parameters of the spring plate on the vibration mode of the finite element model is explored based on the simplified model to meet the demand for modal control of the similar model.