【作者】 赵兴强；

【导师】 温志渝；

【作者基本信息】 重庆大学 ， 精密仪器及机械， 2013， 博士

【摘要】 微能源具有体积小、功率密度高、寿命长、绿色环保等优点，是解决微型器件与系统的电源问题的有效途径，受到了国内外研究者的广泛关注。目前微能源的研究主要针对环境中的动能、热能、太阳能等方面的收集与转化，而对于风能收集的微能源研究较少。基于风致振动机理的微型风能收集器具有体积小、结构简单等优点，是微型风能收集器的主要研究方向。论文针对环境中广泛存在的风能，提出了一种基于颤振机理的微型压电风致振动能量收集器。基于压电效应，建立了微型压电风致振动能量收集器的单向耦合集总参数模型、单向耦合分布参数模型和双向耦合分布参数模型，完成了模型的修正；提出了压电梁与柔性梁复合的颤振新结构，建立了微型风致振动能量收集器在轴向风中的线性颤振模型和非线性颤振模型；研究了微型压电风致振动能量收集器的设计方法，提出了T型柔性梁结构、非流线体结构、逆风颤振结构等优化结构；完成了微型压电风致振动能量收集器可靠性封装设计和器件的加工，研制出了原理验证样机；搭建了测试分析平台，完成了原理样机的性能测试与分析。研制出的原理样机体积0.1cm3，在风速12.2m/s时，开路电压有效值为16.4V、输出功率为3.1mW。论文主要工作是：①研究分析了微型风能收集器的国内外研究现状以及存在的科学与技术问题，提出了基于颤振机理的微型压电风致振动能量收集器研究方案；②基于Euler悬臂梁理论，建立了微型压电风致振动能量收集器单向耦合的集总参数模型与分布参数模型，研究了不同激励下的输出性能；基于双向压电耦合效应，建立了双向耦合分布参数模型，修正了单向耦合模型；采用有限元分析方法对理论模型进行了验证；③提出基于颤振机理的压电梁与柔性梁复合的新结构，基于非定常流气动理论方程、Euler悬臂梁理论建立了颤振机理的线性理论模型，采用切比雪夫配点法完成了数值求解；基于Lighthill气动力学模型、悬臂梁的不可拉伸条件建立了非线性颤振理论模型，采用Galerkin模态叠加方法和Houbolt方法完成了非线性颤振模型的数值化求解；④确定了微型风致振动能量收集器工作风速范围的设计要求；采用颤振理论模型分析了柔性梁尺寸等因素对颤振临界风速等性能的影响，确定了柔性梁尺寸范围；研究了降低临界风速的方法，提出了T型柔性梁、非流线体和逆风颤振结构等三个优化设计方案；开展了微型风致振动能量收集器可靠性封装设计；⑤完成了微型风致振动能量收集器的加工与组装，研制出了原理样机；搭建了小型风洞测试平台和振动测试平台；分析了微型风致振动能量收集器的颤振过程，完成了顺风结构、T型柔性梁结构、非流线体结构和逆风结构等器件的性能测试与分析；研究了环境风的变化对微型风致振动能量收集器性能的影响，完成了器件的过载保护与封装。更多还原

【Abstract】 The micro power is an effective approach for the micro devices and systemsbecause of small sizes, larger power density, long lifetime and green. And micro powerhas being paid attention to at home and abroad. Recently, lots of researches about themicro power sources focus on harvesting the vibration energy, temperature difference,solar and so on from ambient. However, micro power harvesting wind energy is lessreported. Micro wind energy harvester based on wind-induced vibration has become amajor thrust of research because of simple structure and small size.This paper proposes a micro wind-induced vibration (WIV) energy harvester basedon fluttering. Based on the piezoelectric effect, the oneway coupled lumped parametermodel, oneway coupled distributed parameter model and twoway coupled distributedparameter model about the vibration energy energy harvester were developed andmodified. A new fluttering composite structure consisting of piezoelectric beam andflexible beam was proposed. The linear flutter model and nonlinear flutter model of theWIV energy harvester in axial wind flow were established. The WIV energy harvesterswere designed and three optimized flutter structures were presented: T shape flexiblebeam, blunt structure and upwind structure. The reliability and packaging technologiesabout the WIV energy harvester were studied, and the WIV harvester prototypes weredeveloped. An experimental test platform was built up and the characteristics of theWIV harvester prototypes were measured and analyzed. The RMS output voltage of thedevice is16.4V, the power is3.1mW.The main contributions of this work are listed as follows:①The state of the art about the wind energy harvester was analyzed and thechallenges about the device were developed. A wind-induced vibration energy harvesterusing the fluttering mechanism was proposed.②Using Euler-Bernoulli beam theory, the oneway coupled lumped parametermodel and distributed parameter model were developed for the micro piezoelectricvibration energy harvester. The output performance response was analyzed underdifferent excitation conditions. Using the double piezoelectric effect, the twowaycoupled distributed parameter model was developed and the oneway coupled modelswere modified. The micro piezoelectric vibration energy harvester models were verifiedusing finite element method. ③A new fluttering composite structure consisting of piezoelectric beam andflexible beam was proposed for wind energy harvesting. A linear fluttering model of thecomposite structure in axial flow was developed using unsteady Bernoulli aerodynamictheory and Euler-Bernoulli beam theory, and numerically calculated using Chebyshevcollocation method. Meanwhile a nonlinear fluttering model was developed usingLighthill theory and inextensibility condition, and numerically calculated usingGalerkin method and Houbolt method.④The working wind speed rang was determined. The performance of the WIVharvester, such as fluttering critical wind speed, was studied as a function of flexiblebeam size, and flexible beam size range was determined. The critical wind speeddecreasing method was researched, and three optimized structures were proposed: Tshape flexible beam, blunt structure and upwind structure. The reliability and packagingtechnologies about the WIV energy harvester were studied.⑤The WIV energy harvester prototypes were fabricated and assembled. A smallwind tunnel and a vibration test system were built up. The motion state of the WIVenergy harvester was observe and studied. The prototypes using downwind structure, Tshape flexible beam, blunt structure and upwind structure were measured and resultswere analyzed. The performances of the WIV harvester were measured in differentambient wind.更多还原