Noise Problems on Fan of Road Sweeper truck

Road sweepers in the road sweepers mentioned the work environment is generally road, residential and other places, where the place tends to be quiet, which requires a sweeping road on the work environment is friendly, so for the Sweeping the noise generated by the work of the problem will become a sweeping road sweepers manufacturers in the production of sweeping vehicles should pay attention to a problem.

Centrifugal fan noise is the result of the superposition of aerodynamic noise, mechanical noise, gas-solid coupling noise produced by the interaction of gas and solid elastic system. The proportion of various noise in fan operation is 45%, 30% and 25% respectively.

The aerodynamic noise is composed of rotating noise and vortex noise superimposed on each other, the intensity of the rotating noise is roughly proportional to the 5.6 to 6 th power of the impeller exit circumference velocity u. When u doubles, the boosting level will increase by 10-15 dB ; The vortex noise intensity and airflow relative to the blade speed of the 8th power into positive. Mechanical noise depends on the dynamic balance of the impeller performance, manufacturing process level, the stiffness of the force components, fasteners and other factors connected to the effect. The gas-solid coupling noise is produced by the inhomogeneous airflow acting on the solid wall with time pulsation, which is closely related to the pressure pulsation caused by gas flow, flow separation and eddy current. The noise caused by various reasons is superimposed on each other. It is almost impossible to overcome all the noise effectively by taking some measure or means.

On the road sweepers fan noise is an important indicator of sweeping the factory inspection, and in the end the road sweeping noise mainly from the main, auxiliary engines, fans and other components of the integrated noise, today we say to reduce the fan noise It has become one of the important aspects to reduce vehicle noise.