Study On Resistance Reduction Technology Of Subsoilers

Subsoiling is an important conservation tillage measure. Now, most of subsoilers havedeficiency of high soil resistance and high energy consumption, and thus the application ofsubsoiling technology is limited to some extent. Therefore, under the premise of ensuring thequality of subsoiling performance, reducing soil resistance of subsoilers and energyconsumption of subsoiling has become one of the most important objectives of research. Inthis dissertation, the focus of the research is to reduce soil resistance of subsoilers. Amultiplex-modality shape subsoiler and a bionic hook-shape subsoiler are designed based onthe knowledge of bionics, and then soil resistance of these two kinds of subsoiler is testedunder the condition that cutting depth is0.30,0.35or0.40m, and operating speed is4.0,4.5or5.0km/h, respectively. Also, a standard arc-shape subsoiler described in JB/T9788-1999is tested as contrast. Based on the mechanical analysis of the contact between subsoiler andsoil, a mechanical model of soil resistance of subsoiler has been built, and the process ofcontact between subsoiler and soil is animated by dynamic finite element simulation. Soilresistance of subsoiler is predicted by the mechanical model and finite element analysismethod, and then the actual soil resistance of subsoiler is tested by an aoctagonal-ringsensor system in a laboratory soil bin at different cutting depth and operating speed. Theresults show that the two subsoilers which are designed during the work of this dissertationcan both reduce soil resistance significantly, and the multiplex-modality shape subsoiler hasmore significant effect on reducing soil resistance. Also, the results show that using the finiteelement analysis method to predict soil resistance of subsoilers is feasible. On the basis ofthe research stated above, a test bench which is designed to study the effect of vibration onsoil resistance of a subsoiler is built, and the effect of vibration on reducing soil resistance ofthe subsoiler has been studied subsequently. By analyzing the structure of the vibratory partof the test bench, the move pattern of subsoiler on this test bench during working is studied.Based on the study of the move pattern of the subsoiler on the test bench during working, theeffect of angle, frequency and amplitude of vibration on reducing soil resistance of thesubsoiler is studied by the finite element analysis method, and the multiplex-modality shapesubsoiler, which has been proved to have more significant effect on reducing soil resistance,is chosen to finish the task. Within the scope of the test, the results show that as angle ofvibration increases, soil resistance of the subsoiler decreases at first, and then increases, andsoil resistance of subsoiler decreases gradually along with the increase of frequency andamplitude of vibration, but when frequency and amplitude of vibration has increased to somecertain degrees, the decrease of soil resistance of subsoiler is not significant as frequency andamplitude of vibration continues to increase.The research stated above provides theoretical basis for designing new subsoilers, provides research foundation for the development of technology of vibratory subsoilingmachines, and enriches the technology of reducing soil resistance of subsoiler.