摘要
为实现微隔振平台在较宽频带内的主动控制,将一弹性体和第三代压电致动器相串联,设计了一种复合式压电致动器。将复合致动器应用到微隔振平台,并对其整体建模、控制仿真时发现:弹性体相对于作动器位置不同时,在不同的外扰下对控制力的影响不同。为此,设计了一个针对不同外扰对控制力影响的评价函数,通过不同位置对评价函数影响的仿真,结果表明:当隔振平台系统受直接干扰时,弹性体位置对控制力的影响较大;当平台受地基扰动时,弹性体位置对控制力影响不显著。所以,复合作动器的布置形式取决于外扰的类型,且在实验室环境中,两种布置要达到相同的隔振效果,弹性体在上布置所耗费的能量小于其在下布置时的状态。
A type of composite piezoelectric actuator with an elastic body and a piezoelectric actuator connected was designed, it could control an active micro-vibration isolation platform within a wide frequency range. When the composite actuator was used in an micro-vibration isolation platform, it was found that the relative position between elastic body and piezoelectric part affects the control force under different kinds of external disturbance. So, an evaluation function of the control force was built to evaluate the differences caused by different relative positions with direct and ground disturbances. The simulation result showed that the relative position between elastic body and piezoelectric part affects the control force not notablly with ground disturbance only, but the effect is notable with direct disturbance only, so the composite piezoelectric actuator＇s arrangment depends on the types of disturbance; if two arrangements gain the same isolation effect in the circumstance of laboratory, the energy consumed for the arrangement of elastic body above piezoelectric part is less than that for the arrangement of elastic body below piezoelectric part.
出处
《振动与冲击》
EI
CSCD
北大核心
2011年第8期253-257,共5页
Journal of Vibration and Shock
基金
武器装备十一五预先研究资助项目(51312040405)
军械工程学院原始创新基金资助项目(YSCX0904)
关键词
微隔振平台
压电致动器
弹性体
micro-vibration isolation plate
piezoelectric
actuator
