CAJ | 학술논문

为了有效解决无线传感器网络节点的供电难题,提出之字形结构的微型压电式能量收集器。相比于传统的直悬臂梁,此结构等效加大了压电梁的长度,降低了系统的固有振动频率。建立了之字形压电梁的本构方程和受迫振动方程,推导得到其输出电压的频域表达式。基于之字形压电梁的结构,利用ANSYS软件对其进行了谐响应分析。仿真结果表明,压电梁的输出电压在各阶固有振动频率处存在极值,符合理论分析的结果；输出电压大小随压电梁长度增加而降低,随压电梁宽度增加而升高,但均为非线性关系；压电梁末端质量块的长度和厚度、基体层厚度减小时,会导致输出电压的增大。在论文中所提出的结构尺寸下,10根直梁构成的之字形结构压电梁,在其一阶固有振动频率处,输出电压可达10 V以上,符合无线传感器网络节点的实际供电需求,证明了之字形压电梁结构的有效性。
위료유효해결무선전감기망락절점적공전난제,제출지자형결구적미형압전식능량수집기。상비우전통적직현비량,차결구등효가대료압전량적장도,강저료계통적고유진동빈솔。건립료지자형압전량적본구방정화수박진동방정,추도득도기수출전압적빈역표체식。기우지자형압전량적결구,이용ANSYS연건대기진행료해향응분석。방진결과표명,압전량적수출전압재각계고유진동빈솔처존재겁치,부합이론분석적결과；수출전압대소수압전량장도증가이강저,수압전량관도증가이승고,단균위비선성관계；압전량말단질량괴적장도화후도、기체층후도감소시,회도치수출전압적증대。재논문중소제출적결구척촌하,10근직량구성적지자형결구압전량,재기일계고유진동빈솔처,수출전압가체10 V이상,부합무선전감기망락절점적실제공전수구,증명료지자형압전량결구적유효성。
In order to effectively solve the power problem of wireless sensor network node,zigzag microstructure for piezoelectric energy harvester is proposed. Compared to the traditional straight cantilever,this structure is equivalent to increase the length of the piezoelectric beam,reduces the natural vibration frequency of the system. To establish the constitutive equations and forced vibration equations of zigzag piezoelectric cantilever,the output voltage expres-sion is derived. Based on structure of zigzag cantilever,the harmonic response analysis is simulated by ANSYS soft-ware. Simulation results show that the output voltage is present extremes in the order natural vibration frequencies,it is in accord with the results of theoretical analysis;the output voltage amplitude increases when piezoelectric beam length decreases,with the increase of the piezoelectric beam width,the output voltage increases,that is non-linear relationship;when the length and thickness of quality block,the base layer thickness decrease,the output voltage will increase. Based on the structure size proposed in the paper, the zigzag cantilever composed of 10 straight beams,in the first-order natural vibration frequencies,the output voltage is up to 10 V,it meets the actual power re-quirements of wireless sensor network nodes,proves the validity of the zigzag piezoelectric cantilever structure.