高速推土機車體結構及推土鏟推臂的有限元計算與優(yōu)化
[Abstract]:Bulldozer is one of the most widely used construction machinery, which plays an important role in the construction of our country's current infrastructure and national defense. With the development of infrastructure construction, national defense engineering, agricultural machinery and so on, the performance and function of bulldozer are required to be higher. For example, under the premise of satisfying the bulldozer, the 60km/h can be driven at high speed between relatively distant working positions. Compared with the common bulldozer, the bulldozer has lower failure rate and can adapt to a variety of different working environments and so on. The objective proposed in the project is to make full use of the existing high-speed tracked vehicle technology and the current mature technology of the bulldozer, to develop the characteristics of the high-speed crawler bulldozer and to take into account the development requirements of other engineering equipment. Make it become the general platform of high speed crawler engineering equipment. In order to meet the demand of the current market for the crawler bulldozer, the paper redesigns the high-speed driving of the crawler bulldozer on the basis of the original type of bulldozer. The suspension system is installed in the walking system to ensure the ride comfort at high speed, and then the bulldozer can finish the operation of pushing the earth at the same time of the suspension system. This type of high speed crawler bulldozer is composed of propulsion system, operation system, protection system for personnel safety, electric power system, integrated electronic information system, other equipment and tools. In this paper, the working system of the car-body structure of the high-speed crawler bulldozer is studied, and the simulation basis for the design of the car-body is provided by the finite element calculation of the car-body. At the same time, in order to make it run at high speed, balance the weight of shovel and loosening hook, and ensure the smooth operation of carbody, the pushing arm of shovel is optimized by topology. It provides a reference for the design of general platform of high speed crawler engineering equipment in the future. The main research contents of this paper are as follows: introduce the bulldozer, analyze the working condition of the bulldozer, analyze the structure force of the shovel according to the working condition, and get the force of each part of the shovel. This paper provides theoretical support for the correctness of the simplified simulation model, then introduces the carbody structure operation system, analyzes the working conditions of the wheeling operation, determines and calculates the working resistance according to the working conditions, and clarifies the limit conditions required in the simulation. And according to this guidance simulation analysis. This paper introduces the components of the car body of the high-speed crawler bulldozer, establishes the finite element model of the body structure and the bulldozing structure in the operation system, and then carries on the finite element simulation analysis to the car body, according to the material of each part of the car body. Combined with the results of finite element calculation, the conclusion of the analysis is obtained. Then the force of the shovel is analyzed and the result is obtained. In order to balance the center of gravity of the car body, the pushing arm of the shovel was topologically optimized, and the boundary conditions of the optimization model were determined according to the limit working conditions obtained before, and the optimization response and objective function were determined accordingly. After the optimized model is obtained, finite element calculation is carried out according to its working conditions to determine the correctness of the final optimization results. The content of this paper is summarized and the future work is prospected according to the deficiency of the calculation results.
【學位授予單位】:吉林大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TU623.5
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