摘要
为了研究失谐星载天线结构的振动控制,建立了星载天线结构的有限元计算模型;并对结构失谐前后的动力学特性进行了分析;采用预测控制方法,针对失谐前后的结构进行了振动控制,并与二次线性最优控制(LQR)方法的振动抑制效果进行了对比.仿真结果表明:弱耦合星载天线结构参数的微小失谐会导致结构振动产生明显的模态局部化;在由失谐导致模型失配时,预测控制方法对结构振动亦有较好的抑制,而LQR控制方法则引入了激振;在进行此种结构的振动主动控制时必须考虑到结构失谐的影响.
In order to research vibration control for detuned satellite antenna structures,dynamic models of these structures were established using the finite element method.The respective dynamic characteristics of detuned versus properly tuned structures were investigated using the model.Active vibration control of the structures was studied by individually applying predictive control and then a linear quadratic regulator（LQR） control method.The simulation results showed that small amounts of detune in a weakly coupled antenna structure can induce remarkable localization of the vibration mode.It was found that when mismatch induced by detune exists,the vibration of the structure could also be restrained by predictive method,while LQR made the structure vibrate more aggressively.Detune must be seriously considered in active vibration control of antenna structures.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2010年第4期434-437,共4页
Journal of Harbin Engineering University
基金
航天科技创新基金资助项目(CASC0113)
关键词
天线结构
有限元模型
失谐
动力学特性
模态局部化
预测控制
antenna structure
finite element model
detune
dynamic characteristics
modes localization
predictive control
