Key Engineering Materials Vols. 579-580

Abstract: This article aims to optimize the clamp arm's length and the number and shape of the slots of the spring-tube fixture. First it uses the theory of elasticity to create the force deformation model of slot with regular shape, and analysis the deformation of the slot numerically. Then draws the relationship between the elastic deformation and the radius of the bore and the arms length while the force is not change, and comes an ideal shape of the bore through this relationship. It also simulates the deformation of fixture with different number of modified slots through the finite element analysis method, and optimizes the fixture for equal strength further. In summary it comes to meet the requirements of fixture theoretically. Finally through experiments the theory gets verified. From the results of experiments the conclusion can be drawn that the corrected fixture is better than before.

Abstract: In order to improve the performance of the electro-hydraulic servo system, considering the special structure of servo motor, nonlinear model of the servo motor was established in time domain. Several friction models commonly used in project were introduced and applied to the simulation analysis of servo motor with friction torque. The simulation curves show the relationship between driving torque, friction torque, angular velocity and angular displacement. The result confirms the influence of the different friction torque model on the performance of motor, and the LuGre friction model is identified which is fit for the friction torque compensation. This study lays the foundation for the friction torque compensation of electro-hydraulic servo motor.

Abstract: Construction of a rapid surface and processing is an effective way to improve the manufacturing efficiency, this paper linked the 3D scanning, fast surface construction and NC closely, described the whole process of surface data acquisition and processing, surface construction and the process of NC machining. The outer surface of the mouse was scanned from multiple angles by using 3D CaMega scanner, a plurality of point cloud was obtained, the point cloud processing, triangle face processing construct refinement of the model surface and grid lines were all processed in Geomagic Studio software, through adjustments, NURBS surface was generated. Also the mould surface of the mouse was constructed in the UG NX software. This paper wrote the machining process, Programmed NC Milling in UG NX software, generated the trajectory of rough and finishes machining as well as the programs of machining tool. Also CNC milling was processed CNC machining center.

Abstract: Door hardware doors finished slot machining process is a very important step in the process, as doors hardware slots are in scattered locations, different specifications, difficult processing. This paper, the rotary table overcome dispersion slot door hardware, according to the characteristics of wooden slots hardware, selected the minimum number of spindles to satisfy all wood processing hardware slot, making maximize spindle utilization. The use of finite element design rotary table and key components of the cutting system, verify the reasonableness of its structure.

Abstract: STL file is the data source of the technology. As the basis of the technology, the information of the STL file must be picked up, post-processed, and then the G code file which is tallied the PMAC rule generates as a .CFG file form in the environment of VC++. Finally, the goal of programming automation achieves after the pre-processed and post-processed of STL file. The G code downloads in the PMAC Motion Controller to control the additive manufacturing system to manufacture the bone scaffold. It realizes the automation process from the STL file of the bone to the bone scaffold in tissue engineer.

Abstract: Laser marking has become one of the most important identification methods. Compared with the dots scanning marking method, vector scanning marking has a faster marking speed due to its less strokes and smooth trajectory. Based on the principle of the laser galvanometer scanning, an information processing method obtaining the vectors information, pre-marking until control the lasers trajectory is putting forward herein. Experiments proved that this information process method could be applied to character, barcode and any other graphs which could be described by vector information.

Abstract: To remove the redundant points of image background in SFS reconstructed surface, a novel approach which combines the advantages of polygon scan and intersection algorithm and improves contour extraction method is proposed. In one hand, according to the gray scale level of pixels, the 3D profile of object is reconstructed by Shape from Shading method. In the other hand, firstly, the image is transformed into binary image through single-threshold segmentation method, the defects in image are remedied by morphological method, and the 2D contour of image is extracted through differential operator method; secondly, the image is divided into two parts using the polygon scan and intersection algorithm, that is the objective region and the background region; finally, the redundant points of image background in SFS reconstructed surface are removed through the fusing of 3D profile and 2D contour. Experiments shown that the proposed method can effectively remove the redundant points of SFS reconstructed surface, and it not only ensure the shape precision of SFS reconstructed surface, but also improve the universal of Shape from Shading technique.

Abstract: As a kind of flexible and under actuated systems which based on cooperative vehicle infrastructure system (CVIS), autonomous tractor-semi trailer platoon in vehicle networking can enhance the information interaction and controllability of safety. Establish the two degree of freedom model of tractor-semi trailer firstly. Then, we analysis dominant factor and equilibrium point for the under actuated physics system's stability including its coordination evolution rule. Space-time mathematical model was established based on the dynamic observation information during vehicle platoon driving. μ-Synthesis robust controller was designed to deal with real time conditions, for example, following, lane changing and obstacles avoiding. The parameters of autonomous under actuated platoon controller can be adjusted on-line by fuzzy rules. Finally, we verify robust stability and dynamic performance of autonomous under actuated platoon tracking controller by the computation simulation method.

Abstract: Adopting high-speed line scan industrial camera, through window function of the software to capture interested areas scanning by linear structured light, through image processing algorithms and splicing technique to extract 3D feature information of the detected object surface, combined with the camera calibration technology, calculated the three-dimensional coordinates of the detected object, and real-time displayed intuitive pseudo color map, monitored picture signal and weeded out unqualified products. Compared with similar systems at home and abroad, the system are real-time pseudo color graphics display, open system and lower cost.

Abstract: According to the difficulties encountered polishing Non-circular busbar axisymmetrical workpiece, analysis of Non-circular busbar axisymmetrical workpiece polishing requirements, proposes a new model of flexible polishing machine. Then according to the control precision and the developing cost into consideration, determine the "PC+ motion control card" as a form of structure of control system for polishing machine. In this paper, through the analysis of the polishing machine model, established the polishing machine control functions and tasks of each part, formulated the overall hardware frame of polishing machine control system. Then accrod of the polishing function in the program, using vc++6.0 development of form a complete set of application software. In the process of software development, The polishing machine control system operation platform for Windows xp, Using the object-oriented and modularized programming technique, designed and developed Man-machine interface , the initialization module, status display module, parameters setting module, operation module, fault diagnosis module and so on, each part is independent and interrelated, and through calling the dynamic link library. to control the GT400SV motion control card directly.