Volumetric errors are the major contributor to the dimensional errors of a workpiece in precision machining. Error compensation technique is a cost-effective way to reduce volumetric errors. Accurate modeling of volumetric errors is a prerequisite of error compensation. In this paper, a volumetric error model was proposed by using neural networks based on ant colony algorithm. Finally, a volumetric error compensation system was developed based on the proposed model, and which has been applied to a CNC machine tool in daily production. The results show that the volumetric errors are reduced and the machining accuracy of the machine tool is improved.
In this paper, according to the characteristics of caterpillar vehicles, taking the PC200 excavator as a model, a caterpillar chassis model is established using analytical finite element method by the software Analysis. According to the characteristics of operating status, the load distribution of supporting wheels, at horizontal support, across the slopes at 10°, in the state of climbing 30° slopes, is analyzed. Effective support area of any three wheels is analyzed to obtain. The condition of focus circle and vehicle stability is determined. The maximum load of static stability is obtained according to the method of stability of three wheels. The results of calculation provide load support for the strength analysis of caterpillar chassis components and stability analysis, It also provides the supporting data for the structural optimization.
According to the actual working conditions of the hydraulic drill, mechanical properties of track frame are analyzed. Through building simple physical model of the overall structure of the hydraulic drilling rig, a kind of finite element simple analysis method is introduced. Systems analysis of the force statuses of the track frame has been done. As a result, a few of dangerous working conditions are determined. Combining the dangerous working conditions and doing the finite element analysis on the track frame, more accurate stress distributions of track frame may be obtained. These provide a more accurate basis to track frame design.
In this paper, according to the characteristics of caterpillar vehicles, taking the PC200 excavator as a model, a caterpillar chassis model is established using analytical finite element method by the software Analysis. According to the characteristics of operating status, the load distribution of supporting wheels, at horizontal support, across the slopes at 10°, in the state of climbing 30° slopes, is analyzed. Effective support area of any three wheels is analyzed to obtain. The condition of focus circle and vehicle stability is determined. The maximum load of static stability is obtained according to the method of stability of three wheels. The results of calculation provide load support for the strength analysis of caterpillar chassis components and stability analysis, It also provides the supporting data for the structural optimization.
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