【摘要】：為便于評價、優(yōu)化磁式壓電振動能量采集系統(tǒng)的性能,系統(tǒng)研究了該類系統(tǒng)的建模與分析方法,建立了非線性的分布參數(shù)模型用于描述系統(tǒng)的非線性動力學行為,并采用諧波平衡法給出了諧波響應(yīng)的解析解.隨后利用仿真模型分析了磁鐵間距、加速度幅值、負載阻抗對輸出功率的影響,比較了不同激勵頻率和加速度幅值下的最優(yōu)阻抗.結(jié)果表明:雙穩(wěn)態(tài)特性適用于低強度的振動環(huán)境,且愈接近臨界區(qū)域,輸出功率愈高,而單穩(wěn)態(tài)漸硬特性適用于高強度振動環(huán)境,其最優(yōu)間距并不靠近臨界區(qū)域;阱間大幅運動和阱內(nèi)小幅運動均存在高低能量態(tài)共存的現(xiàn)象,愈接近臨界區(qū)域,現(xiàn)象愈明顯;激振頻率是影響最優(yōu)負載阻抗的決定性因素.
[Abstract]:In order to evaluate and optimize the performance of magnetic piezoelectric vibration energy acquisition system, the modeling and analysis method of this kind of system is studied systematically, and the nonlinear distributed parameter model is established to describe the nonlinear dynamic behavior of the system, and the analytical solution of harmonic response is given by using harmonic balance method. Then the effects of magnet spacing, acceleration amplitude and load impedance on the output power are analyzed by using the simulation model, and the optimal impedance under different excitation frequency and acceleration amplitude is compared. The results show that the bistable characteristic is suitable for the low intensity vibration environment, and the closer it is to the critical region, the higher the output power is, while the unistable hardening characteristic is suitable for the high intensity vibration environment, and the optimal spacing is not close to the critical region. The large motion between wells and the small motion in the well exist the phenomenon of coexistence of high and low energy states, and the closer it is to the critical region, the more obvious the phenomenon is. The excitation frequency is the decisive factor affecting the optimal load impedance.
【作者單位】： 西北工業(yè)大學自動化學院;
【基金】：國家自然科學基金(批準號:50905140) 陜西省自然科學基礎(chǔ)研究計劃(批準號:2012JQ7003) 長安大學高速公路筑養(yǎng)裝備與技術(shù)教育部工程中心開放基金(批準號:2013G1502054)資助的課題~~
【分類號】：TM619

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