前副车架自动检具动力学分析与研究
[Abstract]:In the production process of automobile front and auxiliary frame, it is necessary to detect its geometric parameters quickly and efficiently, and the detection efficiency can be improved by using automatic detection system. In the process of automatic detection, the cylinder is used to send the detection mechanism into the hole, shaft and other positions of the structure. When the relative size changes, the detection mechanism will be driven to move, the corresponding data will be read out by the sensor connected to the detection structure, and then the relevant geometric parameters of the structure will be calculated by information processing method. However, the front auxiliary frame is a thin-wall welding structure with complex shape, the thickness is about 2mm, its positioning clamping and detection need the cylinder to drive the movement of the relevant mechanism, when the cylinder pressure changes and fluctuates, it has a great influence on the detection results. The displacement sensor used for detection is very sensitive to vibration, and the automatic detection tool uses cylinder positioning clamping and driving the detection mechanism, its vibration is inevitable, which also has an impact on the detection results. In order to solve the above problems and improve the automatic detection system, the main work of this paper is as follows: (1) the characteristics of the front auxiliary frame structure are analyzed, its three-dimensional model is constructed by CATIA software, and the structure and detection principle of each component of the automatic detection system are analyzed. (2) the grid of the front auxiliary frame is divided by Hyper Mesh, its finite element model is established, and the model is imported into ABAQUS software for dynamic analysis. Including modal analysis and transient response analysis, and the deformation of each position under different loads is obtained by adding gas pressure load of the structure. (3) due to the influence of air pressure on the detection results in the process of automatic detection, the deviation relationship between air pressure and the main dimensions of the front auxiliary frame is obtained by using the multinomial regression analysis method, and the overall deviation of the main dimensions of the front auxiliary frame is taken as the fitness function by using particle swarm optimization algorithm. The optimal pressure 0.4578 MPA is obtained iteratively. (4) by studying the transient dynamic analysis results of stable stiffener under 0.4578MPa pressure load, it is found that the selection of measuring time has a great influence on the accuracy of dimensional measurement. By analyzing the displacement and deformation of the three mounting holes and the left hole of the stable stiffener under the optimal pressure, it is determined that the best time to read the sensor data is about 2s of the unloading load. The application of the automatic detection system of the front auxiliary frame in the automobile production site shows that the automatic detection system can meet the detection requirements. After the perfect detection system, it has high detection accuracy and improves the production efficiency of the enterprise.
【学位授予单位】:中北大学
【学位级别】:硕士
【学位授予年份】:2016
【分类号】:U463.324
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