籽粒损失监测传感器敏感板局部约束阻尼设计

Partial Constrained Damping Design of Sensitive Plate for Grain Loss Monitoring Sensor

分析了籽粒损失监测传感器敏感板的响应与系统阻尼比的关系,提出了通过在敏感板敷设约束阻尼层增加振动系统阻尼比来快速衰减敏感板谐波振动的方法。通过对不同阻尼损耗因子敏感板进行籽粒碰撞响应试验,优选了敏感板的材料和结构形式,在此基础上运用ANSYS软件对敏感板进行了模态分析,确定了约束阻尼层在敏感板上的最佳敷设位置。籽粒碰撞响应试验结果表明,敏感板局部约束阻尼处理后,籽粒碰撞信号波形衰减至1.5 V所用时间由10 ms缩短到3 ms左右,大大提高了籽粒损失监测传感器的检测频率。

The relationship between response of grain impact sensitive plate in grain loss monitoring sensor and damping ratio was theoretically analyzed, and the importance of damping design in sensitive plate was pointed out. A method to increase the damping ratio of the system was proposed, which could quickly attenuate harmonic vibration of sensitive plate by laying a constrained damping layer on sensitive plate. Through grain collision response test on sensitive plate with different damping loss factor, optimal material and structure of the sensitive plate were determined, and the modal analysis of the sensitive plate was carried out though ANSYS software to find out the best location of constrained damping layer on sensitive plate. Grain collision response test results showed that, the time of grain collision signal waveform decayed to 1.5 V was shorten from 10 ms to about 3 ms before and after partial constrained damping treatment, which proved that the detecting frequency of grain loss monitoring sensor was greatly improved.