Study On Test System And Test Method Of Soil-blade Interaction For Bulldozer

Bulldozer completes each kind of operations by soil-blade interaction. It is significant to study the soil-blade interaction process and mechanics in researching the performance, design and utilization of bulldozers. The soil-blade interaction theory is the important research content of mutually affects of the constructing machinery's work devices and work medium in the constructing machinery terramechanics and travel theory.The test methods of soil-blade interaction have usually two kinds: field test and model blade indoor soil bin test. The field test is mainly restricted by the work environment, and the test conditions are difficult to be guaranteed. The model blade indoor soil bin test needs certain specification soil bin and hauling vehicle. Because of using model blade in the soil bin test, the test results can not reflect completely the process and mechanics of soil-blade interaction. Compared with the two test methods above-mentioned, this paper has constructed a bulldozer blade indoor soil bin test research system based on the constructing machinery multi-function test platform of Chang'an University.This bulldozer blade indoor soil bin test research system consists of blade hauling system, blade cutting depth control system, sensors and data gathering and processing system and so on. Various subsystems constitute an organism, it can well meet the primary needs of bulldozer blade indoor soil bin test research.The bulldozer blade work resistance measurement is the important research content in the soil-blade interaction test. In this paper, octagonal ring dynamometers are used to sense the bulldozer blade work resistance, which are widely applied in the constructing machinery test research. According to the test requests, octagonal ring dynamometers are arranged on the correct position of the constructing machinery multi-function test platform. The octagonal ring dynamometers have been designed under the analysis of stressful condition of each one and have been calibrated later. The calibration result indicates that the performances of the octagonal ring dynamometers are high.This paper studies four kinds of test methods of the soil-blade interaction for bulldozer: indoor soil bin test method of bulldozer blade work resistance, unit cutting resistance test method, vibratory soil cutting test method and adhesion reducing test method. In the first kind, the test method and conditions have been given, and the measurement system has been set up. Because the bulldozer blade work resistance time history records are non stationary, this paper discusses the processing method of which. In the second kind, orthogonal test design has been used in the consideration of the large interaction elements related to cutting resistance. In the third kind, the test method of power consumption in vibratory soil cutting has been given. In the last kind, according to the mechanics of adhesion reducing of the blade, some valuable test schemes have been given.The test system and test method in this paper provide some valuable references for the future overall soil-blade interaction research.