Noise Growth Mechanism and Sound Pressure Level on the Noise of Rice Transport Pipe in Rice-Drying and Storage Facility

1.本文总结了碾米厂环境噪声的特点。碾米厂噪声为76-90dB（A），全天等效声级为78 ~ 83 dB（A）。研究结果显示，一天中的噪声暴露量主要取决于碾米厂作业所暴露的声能.抛撒机输米管道噪声的特点如下。输米管道的噪声主要是由大米与管壁的摩擦和碰撞引起的。流动水稻的噪声谱主要由高频噪声组成.对输米管道材料与大米之间的摩擦系数和噪声特性进行了总结。随着摩擦系数的增加，噪声水平增加。噪声水平随着物料移动速度的增加而增加，但摩擦系数总体上随着移动速度的增加而减小.大米与输米管物料之间的碰撞能量和噪声特性总结如下。噪声水平随着碰撞能量的增加而增加。输米管道物料与稻米碰撞所产生的噪音一般较摩擦所产生的噪音为高。

1. The characteridtics of the environmental noise levels in the rice mill were summarized as follows. The noise levels in the rice mill were 76-90dB(A), and the equivalent sound levels during all over the day ranged from 78dB(A) to 83dB(A). It can be seen that noise exposure levels during all over the day were mostly determined by amounts of the sound energy exposed by rice mill works.2. The characteristics of the noise levels of the rice transport pipe by using the thrower were summarized as follows. The noise levels of the rice transport pipe were caused mainly friction and collision between rice and pipe wall. Noise spectrum of flowing rice were constituted mainly high frequency noise.3. The characteristics of the coefficient of friction and the noise levels between rice and materials of rice transport pipe were summarized as follows. The noise levels increased as the coefficient of friction were increased. The noise levels increased as the moving speed of the materials were increased, but the coefficient of friction generally decreased with an increase in the moving speed.4. The characteristics of the collision energy and the noise levels between rice and materials of the rice transport pipe were summarized as follows. The noise levels increased as the collision energy were increased. The noise levels arising the collision between rice and materials of the rice transport pipe were generally higher than that arising the friction.