The transmission system is a critical power component of helicopters, playing an indispensable role in power transmission. Among its key elements, the planetary gear system is an essential part of the helicopter transmission architecture. Establishing a dynamic model of the helicopter transmission system and analyzing the dynamic response of the planetary gear system under varying flight conditions are crucial for enhancing the system’s performance and safety. In this study, the transmission system is modeled comprehensively using the lumped mass method and the finite element method, and the dynamic characteristics of the planetary gear system, as reflected on the main gearbox casing under different flight scenarios, are examined. The findings reveal that the resonance frequencies of the planetary gear system remain consistent across various flight conditions, indicating that these frequencies are governed by the inherent structural and dynamic properties of the system. However, the vibration amplitudes at resonance points differ depending on the flight condition. Specifically, the resonance amplitudes at 0.057 kHz and 0.093 kHz during Hovering are significantly lower than those in other conditions, demonstrating that operational scenarios directly influence vibration response.
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