Experimental study on loosening depth stability for self-excited vibrating subsoiler

Abstract.

The stability of tillage depth is crucial evaluation indicator for working performance of soil tillage equipment. For self-excited vibrating subsoiler, the vibration of shanks has bad impact on keeping tillage depth consistent. Field tests were performed with one self-excited subsoiler to explore the trend of variability of tillage depth under different operating conditions. The impact factors were working depth and forward speed. The variation coefficient of tillage depth was considered as evaluation indictor. Results proved that the actual tillage depth was influenced by the relation of soil resistance and pre-tightening of spring. Variance analysis for variation coefficient showed that the impact factor of working depth had significant influence on variation coefficient at 5% level of significance. In condition that soil resistance was equivalent to pre-tightening of spring, variation coefficient of tillage depth had increase trend with the increase of forward speed.