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Ex vivo heart perfusion has been shown to be an effective means of facilitating the resuscitation and assessment of donor hearts for cardiac transplantation. Over the last ten years however, only a few ex vivo perfusion systems have been developed for this application. While results have been promising, a system capable of facilitating multiple perfusion strategies on the same platform has not yet...
This paper introduces a theory of geometry error modeling for laser beam optics, which is drawn on to establish geometry error model of laser beam optics for multi-axis laser processing robot. Homogeneous matrixes are employed to represent the positions of the characteristic points (laser source, incident point and the end of the laser beam) of the laser beam optics and the positions and gestures...
To reduce the width of the gap between the steel sheets will be welded by laser to form tailored blank, roller forming process by plastically deforming the thicker sheet is presented. Mechanism scheme and working principle of the roller forming device are introduced. Mathematical model of roller forming is founded by experiment and function fitting. Rolling and welding experiment results show that...
Mismatch is an important quality evaluation standard in Tailor welded blanks. The control of mismatch, especially for thinner blanks, is a difficult technique in tailored blank laser welding process. In this paper, the production and control of mismatch is studied based on a tailored blank laser welding system. The origins of the mismatch are obtained after numbers of experiments: the deformation...
To simulate the zero-gravity activities of the docking ring in a spacecraft docking testbed, a gravity balance device with high respond speed and high precision was designed. Mechanism scheme and working principle of the gravity balance device are introduced. The characteristics of the follower mechanism, which may interfere with the gravity balance system, are analyzed in detail. The accuracy of...
Mismatch is an important quality evaluation standard in Tailor Welded Blanks. The control of mismatch, especially for multi-group blanks, is a difficult technique in Tailored Blank Laser Welding process. In this paper, the production and control of mismatch for multi-group blanks is studied based on a Tailored Blank Laser Welding system. The origins of the mismatch are obtained after numbers of experiments:...
This paper presents a novel boost power plant with high dynamic performance. In the experiment of spacial docking,This boost power plant plays as the motor of the aerial vehicle. The mechanism and the principle of the boost are described and the response time of the air-operated system is computed to prove the characteristic of quick-response. The Analysis of the boosting process demonstrates the...
This paper introduces the research on error modeling of a five-axis laser processing robot which has three linear axes and two rotational axes. The error models are developed based on vector/matrix notion. Homogeneous coordinate transformations are employed to represent the ideal and real linear\rotation transformations of the five-axis laser processing robot by considering small angular approximation...
This paper details a novel plane laser welding machine system which combines two large-scale steel blanks superposed together. Several methods are developed in order to solve the technical problems existing in plane laser welding system: It presents major-minor pressing sets which can control the deformation and eliminate the gap effectively; the design of the 4-axis machine which makes the X axis...
This paper presents a new kind of measurement mechanism for the position and attitude measurement of the moving object in a plane. The mechanism and the measurement principles are described and the error models are built by using differential law principles. Analysis practical applying and the simulation demonstrate the feasibility of the method. This mechanism with characters of high precision and...
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