A power transmission chain torsional vibration analysis method of a large-scale variable pitch multi-rotor helicopter

By conducting torsional vibration analysis on the rotor and power-transmission subsystems of a large-pitch multirotor helicopter, the problem of the inapplicability of existing analysis methods is solved, providing guidance on the stability and safety of the power transmission chain and avoiding the risks of resonance and self-excited vibration.

CN117688797BActive Publication Date: 2026-07-24CHINA HELICOPTER RES & DEV INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA HELICOPTER RES & DEV INST
Filing Date
2023-11-23
Publication Date
2026-07-24

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Abstract

The embodiment of the application discloses a power transmission chain torsional vibration analysis method of a large-range multi-rotor helicopter, comprising the following steps: step 1, performing rotor flapping dynamics analysis on the large-range multi-rotor helicopter to obtain flapping inherent characteristics of the rotor; step 2, dividing the power transmission chain of the large-range multi-rotor helicopter into a rotor subsystem and a power-transmission subsystem, performing torsional vibration dynamics analysis on the power-transmission subsystem to obtain torsional vibration inherent characteristics of the power-transmission subsystem; and step 3, performing modal synthesis on the rotor subsystem flapping mode and the power-transmission subsystem torsional vibration mode to perform torsional vibration dynamics analysis on the power transmission chain of the large-range multi-rotor helicopter, and obtaining torsional vibration inherent characteristics and analysis conclusions of the power transmission chain. The technical scheme provided by the embodiment of the application solves the problem that the existing helicopter power transmission chain torsional vibration analysis method is not suitable for the power transmission chain torsional vibration analysis of the large-range multi-rotor helicopter.
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