Vibration characteristics analysis and experimental verification of airfoil rocket sled

DOI:	10.11809/bqzbgcxb2025.03.017
Keywords:	airfoil rocket sled; dynamical stability; coupled sled rail; vibration
Abstract:	In order to solve the problem of stable operation and accurate prediction of vibration characteristics of asymmetric rocket sled on rail. An engineering algorithm is used to quickly estimate the wear between slipper rails to get the clearance of slipper rails at maximum speed. The finite element calculation model of sled rail coupling dynamics at maximum velocity is established. Optimization design was carried out on the aerodynamic forces of the wing. The vibration characteristics of airfoil rocket sled system are analyzed. The airfoil rocket sled test was carried out to verify the study. The optimal aerodynamic downforce of the wing is 20 kN, which can effectively suppress the vibration of the side slipper and prevent the system from rolling. The frequency of the first three bending modes of the airfoil rocket sled system is within 90 Hz. The natural frequency is different from rail, and there will be no sled rail coupling resonance. The wing exhibits vibration characteristics such as up and down swinging and arching. The peak dynamic stress of the slipper shoe reaches 1 500 MPa. The stress of the sled body is with 400 MPa. The side slipper’s maximum peak value of vibration is 5 times than conventional symmetrical rocket sled slippers. In the process of running with the system at low frequency, the side slipper also produces high frequency resonance. The measured root mean square of vibration has the same magnitude and the same trend as the simulated value. The successful implementation of the airfoil rocket sled test provides a new low cost validation method for ground dynamic testing of weapon equipment.
Issue:	Vol. 46 No. 3 (2025)
Published:	2025-03-31
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