压电悬臂梁发电机能量转换效率研究
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国家自然科学基金资助项目(51277088)

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Study on Energy Conversion Efficiency of Piezoelectric Cantilever Beam Generator
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    摘要:

    为提高车轮轮毂振动下的压电悬臂梁发电机能量转换效率,根据哈密顿原理建立了发电机能量转换效率模型,利用数值模拟和试验分析的方法研究了发电机结构尺寸和材料特性对其能量转换效率的影响规律。研究表明,金属基板过厚或太薄、杨氏模量太小都不利于提高发电机的能量转换效率。在金属基板材料不同时,存在一个最佳厚度比(金属基板与总厚度之比)使发电机能量转换效率最高,铜、铝、钼3种金属基板材料的发电机最佳厚度比分别为0.67、0.72、0.45;在相同厚度比(0.5)条件下,钼基板的发电机能量转换效率较高,随着杨氏模量比(金属基板的杨氏模量与陶瓷的杨氏模量之比)的增大,发电机能量转换效率增高,但当杨氏模量比大于4时,发电机的能量转换效率变化不明显。

    Abstract:

    In order to improve the energy conversion efficience of the piezoelectric cantilever beam generator (PCBG) under the vibration of wheel hub, the energy conversion efficience model of the PCBG was established according to Hamilton principle. The influence of structural parameters as well as material properties of the PCBG on the efficiency of energy conversion was studied by means of numerical simulation and experimental testing. The research results show that there is an influence on the efficiency of energy conversion of the PCBG by the parameters of thickness ratios (TRs) and Young’s modulus ratio (YMR); there is an optimal TRs for the PCBG to obtain maximal efficiency of energy conversion in the different metalplate materials, When copper,Aluminum and molybdenum plates are used for substrate, the PCBG achieves the optimal TRs of 0.67,0.72 and 0.45 respectively; In the same thickness ratio (0.5) and external excitation condition, the energy conversion efficience of the PCBG whose substrate is used for molybdenum is higher than the PCBG whose substrate is used for copper or Aluminum. When YMR increases, the efficiency of energy conversion of the PCBG increases too; when YMR is greater than four, the efficiency of energy conversion of the PCBG does not change significantly.

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闫世伟,杨志刚.压电悬臂梁发电机能量转换效率研究[J].压电与声光,2016,38(5):691-694. YAN Shiwei, YANG Zhigang. Study on Energy Conversion Efficiency of Piezoelectric Cantilever Beam Generator[J]. PIEZOELECTRICS AND ACOUSTOOPTICS

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  • 在线发布日期: 2016-10-18
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