Optimal Design Of Bulldozer Unit

Bulldozer unit is the main working unit of bulldozer, also it is an important working unit for military engineer machinery. It can finish some engineering activity such as bulldozing, leveling, obstacle clearance, first-aid repair of road, combat trail construction, excavating vehicle and command emplacement, constructing flat-bottom pit, etc. For military engineer machinery, the weight and adjusting size of its bulldozer unit affects the overall center of gravity position due to the dozing device must be fitted on the front end of them. If the dozing device is designed unreasonably it will reduce the mobility and traffic ability of the military engineer machinery. For bulldozer unit, the position of the hinges affects the size and weight of every bracing member, and it affects the working performance of the machinery. Also, there is some confliction between physical dimension, vision field of driver and basic size, what must be solved in designing. Consequently, based on the military engineer equipment development requirement and the military advance study project of research on optimal design of bulldozer unit and deep control, optimal design method and calculational model for bulldozer unit design is study in the thesis and the results are applied in a significant military project.There are five chapters in the thesis. In chapter one, by analysis for the military requirement and the study status home and abroad of optimal design, the contents of the study and the scheme of optimal design for bulldozer unit is given.In chapter two, typical working condition, five important calculational position, main structural style of bulldozer unit for military engineer machinery and their working mode is analyzed, then optimal design position and design condition and dozing load for optimal design is descript.In chapter three, for the coupling problem between the optimal variables in the typical working condition especially in the front three working condition, the optimal object coupling problem created by equal optimal variables is solved by design of experiments way basing on virtual prototype in ADAMS/Insight. Then, the globally optimal solution is achieved.In chapter four, the optimal design work is divided into blade optimal design and push beam optimal design. In blade optimal design, by analyzing of stress condition and the maximal load and loading and solving in CAE model, using ISIGHT integrate CAE and inherited algorithm, the overall thickness of blade and the thickness of the back are optimized and the weight of the blade is reduced 12.3%. By the same method, push beam is optimized and its weight is reduced 10.6%. The optimal results all reach the given target.In last chapter, the thesis is summarized, and the further work is expected.