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What kind of balancing is generally required for rotors with a large aspect ratio?

Dynamic balancing. For rotating parts with D/L<5 or important rotating parts with special requirements, dynamic balancing tests are generally required, while for rotating parts with D/L>=5, only static balancing tests are usually required. Since the dynamic balance test satisfies the static balance test at the same time, the rotating parts that have passed the dynamic balance test can definitely guarantee static balance, but the static balance test cannot guarantee dynamic balance.