摘要: The coupled interaction between two or more helicopter subsystems has often been the source of vibration problems - problems often costly and time-consuming to correct because they have not surfaced until the design and developmen... 展开 The coupled interaction between two or more helicopter subsystems has often been the source of vibration problems - problems often costly and time-consuming to correct because they have not surfaced until the design and development of the individual subsystems is far advanced. This report gives a review of Sikorsky experience with such problems over the past twenty years of developing gas turbine powered helicopters. It represents part of an overall Government effort to accumulate data which will eventually lead to solutions of generic problems of this type. The problems presented include forced vibration problems (wherein the excitations come from either aerodynamic loads on the main rotor, or mechanical imbalances in the engine/drive train), self-excited vibrations, and a transient response problem. 收起