Application of Intelligent vehicle Image recognition Technology

Yu Liu1 , Shuangxing Tian1 , Shi-dan Fu1 , Carleton Wong2

Abstract: The college student smart car competition provides a variety of design concepts based on image recognition of competitive smart cars. Taking the Freescale smart car contest as an example, the overall framework of the smart car work, image acquisition and image processing and recognition control algorithms are introduced.In the smart car control system, the OV7725 hardware binarized COMS camera module is selected for path recognition, and the captured video data is image processed, and then the center position of the black edge on both sides of the track is extracted, and used as the direction guide line of the car, combined The PID closed-loop control algorithm controls the steering of the steering gear, enabling the car to travel at high speeds while maintaining stability.

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Research on Thermodynamic Characteristics of Tube Weld in Hydraulic Cylinder based on ABAQUS

Jitao Chen, Haiyan Song, Jixin Liu, Weiwei Ge

Abstract: Welding is one of the most important processes for processing and repairing of hydraulic cylinders. The thermodynamic properties of welded joints have important influence on cylinder dimension stability, residual stress and strength. The thermodynamic characteristics of the weld are studied by means of theoretical analysis, finite element numerical simulation and metallographic analysis. According to the theory of welding thermodynamics, the heat conduction equation of one dimension and multidimensional is analyzed, the boundary condition is established, and the heat transfer equation to be solved is expressed. Based on the analysis of the temperature field under the instantaneous fixed heat source, the method of solving the differential equation of heat conduction is obtained. According to the different effects of the welding heat source, the welding thermal cycling phenomenon at different positions of the weld is analyzed. Based on PRO/E, a cylinder connection assembly drawing is established. The coupled model of temperature and displacement is established by ABAQUS. The transient field variable characteristics and output characteristics of the welded joint of cylinder are obtained. In order to obtain the thermal effect of the weld, the metallographic structure and metallographic analysis and research of weld area are also carried out. It shows that the mechanical property that inferred by metallographic analysis is in accordance with simulation research.

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