汽车后视镜压电驱动除雨研究

Research of the Piezoelectricity Rain-Removing System of Rearview Mirror

为了解决下雨天汽车后视镜因雨滴造成的视线模糊问题,提出了一种利用压电晶片振子作为驱动源的汽车后视镜除雨装置,设计了除雨装置的结构,建立了有限元模型,对压电振子进行了模态分析。首先,实验分析了压电晶片振子的静态特性和动态特性,得到了压电振子的谐振频率;然后,制作了汽车后视镜压电驱动除雨装置样机,并对影响后视镜除雨效果的镜面振幅变化规律进行了测试,得到了振幅在对称正弦波作用下随频率、电压幅值的变化情况;最后,对除雨效果与压电振子的安装角度关系进行了测试。试验结果表明:当施加电压为100V、工作频率为800Hz、压电振子的安装角度为60°时,除雨装置的有效除雨量达到了80%。该除雨装置具有除雨效果好、结构简单、价格低廉和安装方便等优点。

In order to solve the problem of blurry sight made by rain drop on the rearview mirror on rainy day,a rain-removing device making use of piezoelectric vibrator is put forward.Design the structure of the rain-removing device,build its finite element model and modal analysis for the piezoelectric vibrator is done.Static and dynamic properties of the piezoelectric vibrator are tested in experiment and get its resonant frequency.Piezoelectric rain-removing device prototype is manufactured and amplitude of the mirror is tested with different voltages and frequency.At last rain-removing effect for the rear mirror is measured with varies of angle at which piezoelectric vibrator is installed.The proportion of the removed rain drop is80% when piezoelectric vibrator angle is 60°and the voltage and frequency on the piezoelectric vibrator is 100Vand 800Hz respectively.The device has many advantages such as good rain remove,simple structure,poor price,convenient installation and so on.