1976 年 37 巻 4 号 p. 600-605
Characteristics of power requirements, torque fluctuation of the rotor, air velocity distribution in the chute and chopping lengths of the materials were studied on the direct-throw flail-type forage harvester. Also the influence of the operating condition and the crop condition upon the chopping length was investigated using the model of cutting mechanism.
1) Power requirements of the flail rotor increased linearly as the material throughput was increased and varied with the kind of crops and their growth stages. From distributions of power requirements the blowing air horsepower occupied 35-45% of the total power.
2. Concerning torque fluctuations of the rotor the amplitudes were large resulting from the knife rows arrangements and veriating throughputs of the materials. From the spectral analysis of torque the frequencies of fluctuation were mainly due to the revolution speed of the rotor and its duplicated frequencies of the symmetrically arranged knife row.
3) At the throughput of 15t/hr or more, blowing up the materials was not enough even in harvesting the green crops due to the lower air velocities in the chute.
4) From the distribution of chopped lengths those of about 10cm long were counted comparatively many. However, the longer materials of 30-40cm were observed considerably. The distribution pointed out the characteristic of wide range. Analysis of cutting mechanism clarified that long stalks increased with the increase of cutting pitch V/n and of standing heights.