CAJ | 학술논문

针对航天器微振动高性能隔振的特殊要求，提出一种基于网结构的新型隔振方法，对由振源－网结构－弹性边界构成的耦合系统进行了振动建模与分析。对于网结构，采用子结构导纳综合法建立其模型，获得了垂直于网面的频域振动方程；对于边界梁，采用弦－梁单向耦合，将动态张力沿垂直和水平方向分解，得到振动响应的完整描述。在此模型基础上，分析了耦合系统的振动传递特性。为验证理论的正确性，设计并搭建了网结构微振动实验台。结果表明，网结构平台具有良好的被动隔振效果，在较宽的频段内，可以实现20 dB 以上的振动衰减。
침대항천기미진동고성능격진적특수요구，제출일충기우망결구적신형격진방법，대유진원－망결구－탄성변계구성적우합계통진행료진동건모여분석。대우망결구，채용자결구도납종합법건립기모형，획득료수직우망면적빈역진동방정；대우변계량，채용현－량단향우합，장동태장력연수직화수평방향분해，득도진동향응적완정묘술。재차모형기출상，분석료우합계통적진동전체특성。위험증이론적정학성，설계병탑건료망결구미진동실험태。결과표명，망결구평태구유량호적피동격진효과，재교관적빈단내，가이실현20 dB 이상적진동쇠감。
A novel vibration isolation method using a plane grid structure was presented to meet the special demand of high-performance vibration isolation against microvibration in spacecraft.The vibration of a coupled system,which consists of vibration source,grid structure and flexible support,was modeled and analyzed.The out-plane vibration equation of the grid structure in frequency domain was obtained by using the substructure mobility synthesis principle. Based on the assumption that the coupling between string and beam is unidirecional,a complete description of the vibration of the beam was achieved by decomposing the dynamic tension force of the string in the vertical and horizontal directions.The vibration transmission characteristics were analyzed in terms of the synthesized model and an experimental platform was set up to verify the isolaion performance of the grid structure.The results show that the grid-structure is effective in vibration isolation and more than 20dB attenuation in transmission can be achieved.