Abstract. As the largest and longest bone in the human body, the femur has important research value and application prospects. This paper introduces a fast reconstruction method with Mimics and ANSYS software to realize the heterogeneous modelling of the femur according to Hu distribution of the CT series, and simulates it in various situations by finite element analysis to study the mechanical characteristics of the femur. The femoral heterogeneous model shows the distribution of bone mineral density and material properties, which can be used to assess the diagnosis and treatment of bone diseases. The stress concentration position of the femur under different conditions can be calculated by the simulation, which can provide reference for the design and material selection of prosthesis.

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Abstract. This article proposed a new method which introduces human body structure into gesture recognition besides the traditional vision information. By establishing the target's skeleton model, the system could rule out background interference quickly from the real-time frames, then locate the target's joints accurately, and track the gestures automatically. This method applies a common monocular webcam for image input instead of expensive depth cameras or complex binocular cameras. It can build a vivid human model and simulate the target's gestures well. After a modified KNN classification which has self-learning ability, the relationships between these joints are analyzed, and the corresponding postures and movements are identified. This method avoids global scanning in each frame and simplifies the classification, thus the computation decreases sharply. The results show that the method has a good tolerance of complex background, it can solve the target missing well.

As a plastic forming process developed based on rotary wheel spinning technology, the rotary ring spinning process has the excellent characteristics of high forming accuracy and high material utilization rate, and has been gradually applied to the manufacture of bimetallic composite pipes. In this paper, the forming law of a bimetallic tube in the process of rotary ring spinning was analyzed by numerical simulation and experimentation. The results show that the deformation coordination of the basic and cover tubes increased with the increasing press amount, and the feed ratio had less of an effect on the thickness variation. In addition, the three-way strain of the basic and cover tubes and the degree of influence of the process parameters on the equivalent strain of the tubes were also studied. The results show that the radial strain on both tubes was the largest, followed by the axial strain, and the tangential strain was the smallest; the press amount had the largest effect on the equivalent strain of the tubes, followed by the angle of attack and the feed ratio. These results provide some guidance for the manufacture of high-performance bimetallic composite tubes by rotary ring spinning.