Tractor and implement configuration for reducing power hop

摘要: Agricultural tractors come to jump and bounce severely in specific field conditions. This phenomenon of instability, commonly called "power hop", is more likely happen when the soil dry, has been worked recently, tractor pulling disks, or a chisel. Many efforts have already made control phenomenon, some empirical techniques proved somewhat efficient. Yet, these sometimes prevent farmers from using their optimal conditions terms tire inflation pressures, ballast… So far, no radical solution found regarding conception, carcass construction, materials, other characteristics… Thus, objective work presented here double: first understand analytically origin secondly, find configuration parameters that can improve system stability. A simplified analytical model presented, which demonstrates possibly instable nature system, Laplace transform approach. The influence various (tractor pitch inertia, wheel base, drawbar height) operating (drawbar force) then be known. Experimental tests were conducted both on hard (concrete) soft (wheat stubble) verify predictions. These confirm predicted interest lowering height close ground level.