With the rapid development of China's economy, the design of bridges has also made considerable progress. Starting with the model requirements and competition rules of the comprehensive ability competition of engineering training, this thesis designs an arched truss bridge after comparing the concentrated bridge structures. The bridge has simple structure, clear and concise stress and beautiful appearance, and can give full play to the compression resistance of paper made from bamboo. The finite element analysis software ANSYS is used to analyze and calculate the strength, stiffness and stability of the bridge model. The experimental results prove that the designed bridge can bear the load of 20 kg.
As one of the core components of drilling and tapping machine, the spindle box unit of drilling and tapping machine is connected with the spindle unit of drilling and tapping machine on the bearing and fixed with the column unit of drilling and tapping machine through linear guide rail. Its stress and deformation have an important impact on the geometric accuracy and service life of the whole drilling and tapping machine. In this paper, the spindle box element of i5M1.4 drilling machine is studied. The maximum stress and strain of the spindle box are obtained from the static finite element analysis, and the first six natural frequencies and vibration modes of the spindle box are obtained from the modal analysis.
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