CAJ | 학술논문

针对舰船内部动力机组浮筏系统低频隔振效果不佳的问题，提出有源前馈控制解决方案。建立由多向扰动振源、分布参数主被动一体式隔振器、中间柔性筏体及弹性安装基础组成的浮筏混合隔振系统结构声传递广义数理模型。基于导纳矩阵理论，定量考虑实际作动器输出的阈值限制，给出浮筏混合隔振系统动态传递特性统一数学模型。从声振能传递与控制角度揭示系统耦合振动机理并给出浮筏系统隔振设计遵循准则。研究表明，力矩激励在浮筏隔振系统能量传输中扮演重要角色，应尽量减少力矩扰动所致能量注入；中间筏体结构柔性及与隔振器内共振的耦合交互作用使中高频段系统隔振性能恶化；全主动控制策略可结合上、下层主动控制策略在低、中高频段的振动控制优势，能实现宽频域内声振能控制最优化。
침대함선내부동력궤조부벌계통저빈격진효과불가적문제，제출유원전궤공제해결방안。건립유다향우동진원、분포삼수주피동일체식격진기、중간유성벌체급탄성안장기출조성적부벌혼합격진계통결구성전체엄의수리모형。기우도납구진이론，정량고필실제작동기수출적역치한제，급출부벌혼합격진계통동태전체특성통일수학모형。종성진능전체여공제각도게시계통우합진동궤리병급출부벌계통격진설계준순준칙。연구표명，력구격려재부벌격진계통능량전수중분연중요각색，응진량감소력구우동소치능량주입；중간벌체결구유성급여격진기내공진적우합교호작용사중고빈단계통격진성능악화；전주동공제책략가결합상、하층주동공제책략재저、중고빈단적진동공제우세，능실현관빈역내성진능공제최우화。
In order to improve the low-frequency performance of floating raft systems conventionally used in marine ships,a feedforward active control solution was proposed.An analytical model consisting of complex excitations, distributed parameter isolators,a flexible floating raft and a non-rigid foundation was established.Considering the output threshold of actual actuators,a general mathematic description of the dynamic transfer characteristics of the overall system was given by using the mobility matrix approach.It is shown that moment excitations play an important role in the vibration transfer process.Coupling interactions between the elastic raft and distribution parameter isolators can lead to a deterioration of performance in the high-frequency domain.The upper active control strategy can achieve good effect at rigid-body modal frequencies,and the prominent advantage of the lower active control strategy is mainly reflected in higher frequency band.However,the full active control strategy can realize the optimal control of vibra-acoustic power in broadband domain.