| 摘要: |
| 【目的】研究生物柴油和柴油混合比与其频率响应特性的关系，根据频率响应特性快速准确地检测生物柴油和柴油的混合比。【方法】采用自行设计的一种介电特性传感器，在实验室测量14种混合比（0,5%,10%,15%,20%,25%,30%,40%,50%,60%,70%,80%，90%和100%）的生物柴油与柴油混合燃料的频率响应特性（振幅增益和相位差），分析频率响应特性与混合比的相关性，并用PLS和Stepwise回归法进行拟合，建立混合比的检测模型。【结果】频率响应特性与混合比之间具有很高的相关性，PLS回归训练模型与验证模型的相关系数R2均大于0.99，而相应的均方根误差均小于0.009。Stepwise回归明显减少了数据量，也有很好的预测效果。【结论】采用介电常数和频率响应法测量生物柴油的混合比，不仅可以得到较高的精度，而且能满足快速检测的要求。 |
| 关键词: 生物柴油 介电特性 混合比 频率响应特性 |
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| 基金项目:西北农林科技大学回国人员科研启动基金项目（01140411） |
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| Measuring mixratio of biodiesel/diesel blend based on the frequency-response properties |
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| Abstract: |
| 【Objective】Study was done on the relationship of mixratio and frequency-response characteristics of biodiesel and diesel blends through experiment.According to the frequency-response characteristics,mixratio of the blend fuel can be measured fast and accurately.【Method】A permittivity sensor developed in a previous study was used in laboratory to measure the frequency response data(gain and phase) of 14 biodiesel/diesel blends（0,5%,10%,15%,20%,25%,30%,40%,50%,60%,70%,80%,90%,100%）.Correlation between mixratio and frequency-response was analyzed.With PLS and Stepwise regression fitting,the mixratio detecting models were constructed.【Result】Correlation between mixratio and frequency-response is very high.R-square values are greater than 0.99 while RMSE are less than 0.009 for both training and validation of PLS regression models.Stepwise regression significantly reduces the amount of data,also has a good prediction result.【Conclusion】Using the permittivity and frequency response method to measure the mixratio of biodiesel blend can get high precession and meet the requirement of fast identification. |
| Key words: biodiesel permittivity mixratio frequency-response |
