【作者】 孙桂兰；

【导师】 唐德威；

【作者基本信息】 哈尔滨工业大学 ， 机械设计及理论， 2008， 硕士

【摘要】 极化后的铁电陶瓷材料镧改性锆钛酸铅(PLZT)在特定波长的高能光束照射下具有明显的光致伸缩效应,可作为新型的非接触激励光致伸缩作动器用于智能结构设计与控制。本文在分析PLZT铁电陶瓷的光机电耦合特性的基础上,深入研究了由LED紫外光源触发的典型光电层合柔性板壳结构的非接触激励技术,并提出一种满足多模态控制要求的新型多自由度作动器,全面研究其模态控制特性,为其在复杂智能结构中的应用提供理论依据和技术支持。基于PLZT光致伸缩作动器的物理特性,本文阐述了光致伸缩作动器工作所涉及的光、热、电、力等能场耦合的机理;通过对光致伸缩作动器本构关系的分析,完善了光致伸缩作动器的本构方程,推导出单片式光致伸缩作动器的控制力及力矩表达式,并揭示了各能场交互作用下的光致伸缩作动器的温升和位移响应特性。在系统理论建模和作动器控制效应数值仿真的基础上,本文搭建了基于LED紫外冷光源的光致伸缩结构系统实验平台,开展了针对作动器光致伸缩特性和光电层合悬臂梁结构静态偏移、动态衰减的实验研究,通过实验数据与理论值的对比分析,验证了光致伸缩效应及光电层合悬臂梁智能结构系统模型的正确性。为推动分布式光致伸缩作动器在二维薄壳结构控制中的应用,本文以等截面变曲率圆柱壳为研究对象,建立了光电层合圆柱壳结构系统控制方程,研究了作动器的布局优化和系统动力学问题,并对分布式光致伸缩作动器的模态激励效应进行评价。本文针对空间薄壳结构的模态控制特性,提出了一种新型的多自由度光致伸缩作动器,并对其构型及参数进行了详细设计。通过与同等条件下单片式光致伸缩作动器对圆柱薄壳结构的控制效果对比分析,证明了多自由度光致伸缩作动器对于曲率壳结构模态控制的优越性,也为其在空间复杂结构控制领域的应用奠定了基础。更多还原

【Abstract】 The polarized lanthanum-modified lead zirconate titanate (PLZT) exhibits a significant photostriction effect when subjected to certain wave-length light illumination. So it can be used for non-contact precision excitation and control in smart structure. Based on detailed analysis on the light-electric-mechanic coupling characteristics of PLZT, non-contact excitation technique on typical flexible plate-shell structure attached with photostrictive actuator is studied. A new style multi-degree-of-freedom (DOF) actuator is put forward. Thoroughly study of its modal control performance will provide theory reference and technical support in complicated intelligent structure.Based on the physical characteristics of PLZT photostrictive actuator, the light-thermal-electric-elastic coupling mechanisms of the photostrictive actuator are stated. By analyzing the relationship of the governing equations, the control force/moment of one-piece actuator is deduced, the temperature and displacement response characteristics of the actuator in multi coupling filed effect are revealed.Following the theory modeling and mathematic simulation of actuator control effect, test platform for photostriction properties and exit properties of attached photostrictive cantilever beam have been built up to verify the validity of theories above, then research on these properties have been carried out. Through the comparison of test result and theory value, the theory model of photostrictive effect and photostrictive actuator attached cantilever beam is validate.To drive the application in the two-demission thin shell structure of distributed photostrictive actuator, the governing equation of photostrictive actuator attached stable area but changeable curvature cylindrical shell is studied. The actuator configuration arrangement and system dynamics characteristics are studied, besides the evaluation of modal actuation effect of the actuator.Multi-DOF actuator is put forward to make up the deficiency of one-piece actuator, its configuration and design parameters are studied. Its modal control advantages on shell are validated by comparing with the one-piece actuator in same situation. It provides the foundation for space composite structure control.更多还原