抄録
The changes of vibratory accelerations of agricultural vehicles due to the working conditions were studied and the following results were obtained:
1) Both the tractor-carried-trailer and the rearcar showed a considerable value of acceleration (1.2g to 1.8g) in the slow running, while the tiller-carried-trailer showed a lower value of acceleration in spite of its handy and plain vehicle (cf. Fig. 2, Fig. 3).
2) Impact acceleration decreased inversely with. the increase of load on each vehicle (cf. Fig. 4).
3) The change of tire inflation pressure as far as concerned did not affect much on the impact acceleration of the vehicles (cf. Fig. 5).
4) The upper carton box piled upon the floor of tractor-carried-trailer was accelerated two times the acceleration of the lower one.
The impact acceleration of rear-car and tillercarried-trailer were not affected much by the height of piled carton box (cf. Fig. 6).
5) Uneveness (obstacles) located continuously on the testing road, even if a smaller one, caused a high value of acceleration. Passing over the step of 3.5cm height, the value of acceleration were measured as 0.6g by rear-car, 0.8g by tiller-carriedtrailer and 1.4g by tractor-carried-trailer (cf. Fig. 7).
6) The value of acceleration differs according to the located position of a carton box on the floor of trailer in the following order as, by tractor-carried-trailer:
(Rear part)>(Center part)>(Front part)
and by tiller-carried-trailer:
(Front part)>(Rear part)>(Center part)
These tendencies differ due to the construction of hitching (cf. Fig. 8).
7) The impact acceleration of the vehicles diminishes inversely with the increase of distance between the obstacles on the road (cf. Fig. 9).
8) Impact acceleration due to the starting and stopping of the vehicles were not large enough to be taken up as a problem (cf. Fig. 10).
