传感技术学报
傳感技術學報
전감기술학보
Chinese Journal of Sensors and Actuators
2015年
10期
1494-1502
,共9页
王光庆%张伟%刘创%杨斌强%廖维新
王光慶%張偉%劉創%楊斌彊%廖維新
왕광경%장위%류창%양빈강%료유신
压电能量采集器%非线性振动特性%双稳态行为%Duffing非线性磁力
壓電能量採集器%非線性振動特性%雙穩態行為%Duffing非線性磁力
압전능량채집기%비선성진동특성%쌍은태행위%Duffing비선성자력
Piezoelectric energy harvester%nonlinear vibration characteristics%bistable behavior%Duffing nonlinear magnetic force
为了提高线性压电振动能量采集器的输出特性,在线性压电振动能量采集器悬臂梁末端引入Duffing非线性磁力,构造了一种双稳态非线性压电振动能量采集器;综合考虑能量采集器的动态振型与轴向应变分布情况,建立了系统非线性机电耦合集总参数运动控制模型,并利用4阶、5阶Runge-Kutta算法对能量采集器的非线性振动特性进行了数值模拟;利用谐波平衡法计算获得了能量采集器的幅频响应方程,数值分析了激励频率、激励幅值以及磁铁间距等对系统非线性振动特性的影响,发现双稳态运动可以极大地提高能量采集器的频率响应范围和能量采集效率,并且能量采集器在低频、低幅值激励情况下可以产生大幅值周期运动;最后,通过实验对数值计算结果进行了验证.
為瞭提高線性壓電振動能量採集器的輸齣特性,在線性壓電振動能量採集器懸臂樑末耑引入Duffing非線性磁力,構造瞭一種雙穩態非線性壓電振動能量採集器;綜閤攷慮能量採集器的動態振型與軸嚮應變分佈情況,建立瞭繫統非線性機電耦閤集總參數運動控製模型,併利用4階、5階Runge-Kutta算法對能量採集器的非線性振動特性進行瞭數值模擬;利用諧波平衡法計算穫得瞭能量採集器的幅頻響應方程,數值分析瞭激勵頻率、激勵幅值以及磁鐵間距等對繫統非線性振動特性的影響,髮現雙穩態運動可以極大地提高能量採集器的頻率響應範圍和能量採集效率,併且能量採集器在低頻、低幅值激勵情況下可以產生大幅值週期運動;最後,通過實驗對數值計算結果進行瞭驗證.
위료제고선성압전진동능량채집기적수출특성,재선성압전진동능량채집기현비량말단인입Duffing비선성자력,구조료일충쌍은태비선성압전진동능량채집기;종합고필능량채집기적동태진형여축향응변분포정황,건립료계통비선성궤전우합집총삼수운동공제모형,병이용4계、5계Runge-Kutta산법대능량채집기적비선성진동특성진행료수치모의;이용해파평형법계산획득료능량채집기적폭빈향응방정,수치분석료격려빈솔、격려폭치이급자철간거등대계통비선성진동특성적영향,발현쌍은태운동가이겁대지제고능량채집기적빈솔향응범위화능량채집효솔,병차능량채집기재저빈、저폭치격려정황하가이산생대폭치주기운동;최후,통과실험대수치계산결과진행료험증.
In order to improve the output performances of the linear piezoelectric vibration energy harvester (PVEH),a bistable nonlinear PVEH was developed by adding a Duffing nonlinear magnetic force to a tip end of the linear PVEH. The governing motion of the nonlinear electromechanical lumped parameter of the bistable PVEH was derived with considering the dynamic shape and the axial strain of the cantilevered beam of the linear PVEH ,a four or five order Runge-Kutta algorithm was used to analyze the dynamic behaviors. The frequency responding function was derived with the resonant balance method;the effects of the exciting frequency,the exciting amplitude and the distance between the two magnets were numerically studied. The research results have shown that the bistable mo-tion can not only improve the operating frequency wideband and the energy harvesting efficiency,but also easily make it move in a periodic large-amplitude orbit under a low exciting frequency and amplitude. At last,some experi-ments are carried out to testify the validity of the numerical results.