Failure analysis and improvement measures of hypervelocity monorail rocket sled

To analyze the failure of the recent hypervelocity monorail rocket sled test, the instability phenomenon and causes of foreign high-speed rocket sleds were discussed, and failure analysis was carried out in terms of measured data such as photoelectric theodolite, telemetry equipment, rail irregularity and boot-rail gap. The sled-rail coupling dynamics analysis method was used to reproduce the failure, and effective solution measures were proposed. The system of the rocket sled was optimized and improved. The test verification and vibration data comparison were carried out. The results of the study showed that the rocket sled system resonated violently near the velocity of 1100 m/s, leading to destruction of the sled at weak points. The small gap between the slipper and rail exacerbated the vibration of the rocket sled at low speeds, while melt wear increased the gap at high speeds. This exacerbated the monorail rocket sled roll torsion effect, causing localized failure damage to the system. The system motion stability can be effectively improved by adjusting the rail irregularity, increasing the structural strength and stiffness of the sled, and improving the slipper-rail gap.