Abstract: Moving target tracking is widely used in various fields, but adaptive tracking algorithm is not ideal. Proposed a multi-mode adaptive CamShift algorithm (MACA). CamShift algorithm will be sensitive to the characteristics of H component extended to the S, V components, convex combination model is constructed using multi-objective programming optimal solution method for the best combination of solution adaptive color recognition, with the inclination to identify and target-based IIR filter state of motion information to predict tracking technology made color more complex target scene is rotated, block and rate of change can accurately track the results. The experiments show that the algorithm has good robustness and adaptive ability.
Abstract: Engineering education has been a worldwide hot topic currently. Reform of engineering education call for a new model of cultivating talents. To the aim of training students’ engineering awareness, engineering skills and engineering spirit, combination general education and professional education, reference ISO9000 standards and according to engineering practice established eight principles of engineering education. University or college should be a place which guide and encourage students to study independently, multi-disciplinary and interdisciplinary learning. Respect the differences of students and teach them in accordance with individual differences. Curriculum setting should reflect the essence of ISO9000 management theory. Teaching practice show that TSIP (Try-Study-Instruct-Practice) teaching model is an effective method in engineering education and good results have been achieved. ISO9000 management theory and the TSIP teaching methods are applied in engineering education, could construct a model maximum meet the international CDIO standard engineering education. The learning process is teacher guidance and student-centered, teacher-student bilateral exchanges, practicality and self-study ability. This paper put forth a new way and a new model inventively for engineering education.
Abstract: Using the Fuzzy PID’s control method into the servo control system and the PID parameters can be adjusted real-time according to the simulation results, which corrects the system. Increasing the adaptabilities for the parameters’ real-time changings to improve the controlled object’s steady and dynamic performance, the system’s control precision and the capability of anti-jamming. With the help of MATLAB's FUZZY toolbox, the system’s control performance is tested in the aspects of system modeling and simulation.
Abstract: The paper is focused on a double-joint hopping leg driven by motors. Using relative coordinates, its kinematics and dynamics between the system and components are established during the launching stage of jumping, and the take-off mechanism is analyzed. Based on mechanics of jump movement and joint trajectory planning method, the impact of the change of the system initial posture and joint trajectories upon the system take-off performances, such as energy efficiency, instantaneous velocity of the system center of mass (CoM), is discussed by using numerical simulation approach with drive constraints. For a hopping robot, good take-off performances can improve its motion ability, so the resulted conclusions here provides a useful and helpful reference for analyzing and designing a multi-joint hopping robot.
Abstract: In this paper, the constitution of an exhausted-air reclaiming system for pneumatic cylinders is studied. The effect of the system on the cylinder velocity characteristics and the control method are also researched. Experimental results show that attachment of a reclaiming device would not cause bad influence on the velocity stability if the switch point could be properly controlled. Experiments also indicate that the switch control differential pressure DPsw varies with Pc in receiver and the supply pressure Ps and affect the velocity stability of cylinders. Therefore for reclaiming more energy and making less influence on the cylinder velocity characteristics, the suitable switching-point and the value of DPsw are also tested and suggested.
Abstract: This study was focused on the theoretical analysis and experimental investigations about the frictional wear of nanometric zirconia dental ceramics. An MRH-3 digital-display high-speed ring-on-block tribometer was used for frictional wear experiments. A PGI800 coarseness profiling instrument was used to test the width and the length of the grinding defects on specimen surfaces. An S-3500N SEM was employed in the microscopic observation of the surface morphology after the abrasion. Results indicated that the frictional factor and the wear rate of nanometric ZrO2 ceramics decreased significantly under identical working and frictional conditions compared with ZrO2. The wear mechanism of nanometric ZrO2 ceramics was micromachining and plastic deformation while the wearing mechanism of ZrO2 ceramics was brittle fracture and abrasive wear.
Abstract: This study was focused on the testing and assessment of the mechanical properties of nanometric zirconia dental ceramics. The density and the apparent porosity of specimens were tested with the Archimedes drainage method. The length variation of the specimens before and after sintering was measured with a vernier caliper, and the linear contraction was tested. An X-ray diffractometer was used for the specimen phase analysis. SEM was used to observe the section micrograph of the specimens. A universal mechanical testing machine was used to test the three-point flexural strength and the fracture toughness. A microhardness tester was used to test the Vickers hardness of the test specimens. Results indicates that the flexural strength of the test specimens ≥ 890MPa, the fracture toughness ≥6Mpa.m1/2, the Vickers hardness ≥ 1240MPa, the linear contraction ≥ 21%, and the apparent porosity ≥ 0.32%. Fully satisfying the requirements in oral medicine, the ceramic is an ideal material for biological joints and dental prosthesis.
Abstract: On the basis of the surface grind-hardening experiment, the influence of grinding pass on the microstructure and its uniformity of the grind-hardened layer of 65Mn steel were studied using optical microscope, scanning electron microscope, and digital microhardness tester in detail. The results show that the grind-hardened layer generated by two-passes grinding has better uniformity compare with one-pass grinding along the length. Under the conditions of this experiment, grind-hardened layer generated by one-pass grinding has part unhardened region, and grinding pass has little remarkable effect upon the delamination of the macrostructure, the microstructure and its microhardness value of the hardened layer. The hardened layer comprises completely hardened zone and transition zone, and the completely hardened zone whose microhardness is about 780HV0.5 is of fine lathe martensites, residual austenite and a few carbides. The grind-hardened layer uniformity can be observably enhanced when two-passes grinding is adopted.
Abstract: With its variable stiffness, capability to provide friction damping by itself, and space-based adaptive performance, the disc spring, by replacing the cylindrical helical spring extensively, has found wide application in fields like aerospace, metallurgy, architecture, machinery and so on. For the nonlinear combination disc-spring vibration isolator, the mathematical model is established in this study on the basis of classical disc spring theories. The simulation results of the combination vibration isolator under simple harmonic excitation and the effects of damping ratio and different types of load on the vibration isolator are explored in depth, the findings of which help to lay a solid foundation for parameterization and serialization of the nonlinear combination disc-spring vibration isolator.