Advanced Materials Research Vols. 291-294

Abstract: The excavator robot need to track bucket goal and its attitude real-time and dynamically during it’s autonomous mining. On the basis of analyzing basic action of mining operations, collected sequence image of mining process of bucket. To reduce the effect of light environment to image processing, use the target tracking method based on color characteristics to recognize color mark block. The bucket attitude angle can be recognized according to the mark of angle attitude of bucket; the bucket target can be recognized according to the mark block of bucket target. Due to sheltered phenomenon, use stripe color block to recognize bucket target while mining process. The color mark block resolve the target tracking problem for bucket, but also fussing the information of pressure sensor of bucket, thus establishing the foundation for subsequent realization based on behavior of autonomous mining.

Abstract: PID controller has already been applied widely, but it is difficult to meet the requirement of both static and dynamic performance, which makes PID running without efficiency. Through programming transition process, the paper designs the rationality of given signals in the whole process and introduces an auxiliary application of differential signals, which can realize the control goal in programming control process and make the control key change from confirming the transition of system model to estimating the constant time of system roughly, and the control effect has been improved evidently. By analyzing MATLAB simulation, the paper verifies that the algorithm is reasonable and prevalent.

Abstract: For a class of multivariable second-stage time delay system, this paper study the decentralized controller designing method based on RNGA matching method, then design the IMC-PID controller for the paired main elements. Simulation results show that the decentralized control method can easily control the original system, using the IMC-PID controller, the control effect obtained enhancing

Abstract: There are some problem for Strip transmission process, such as low deviation information accuracy , poor reliability, poor control results,the electro-hydraulic servo central position control system of Strip based on the principle of differential capacitance was designed. The differential connection is used for eliminating signal drift and the nonlinear characteristics，high frequency power supply is used for reducing output impedance and improving the system bandwidth, double shielded is used for eliminating the impact of parasitic capacitance, the electro-hydraulic servo central position control system based on fuzzy PID is designed. Research shows that the measuring circuit and control system are with high precision, good reliability, maintenance-free advantages.

Abstract: In this paper, according to nuclear reactor pressure vessel for the J-groove type, independent research and development of a special groove in the J-automatic control system program. This paper introduces a PC-based industrial computer as the host operating system and the functional modules are described respectively, by comparison of a variety of robot programming languages​​, ultimately to achieve the goal of the program using the Visual C++ MFC platform. The system has a friendly interface, which can be easily set to display, on-line adjustment and automatic welding for the preservation, through simulation experiment with industrial PC connection to verify that the entire system software design is reasonable, functional and meet the actual needs of production.

Abstract: This paper analyze the importance of using PID servo-control parameters based on PMAC motion control card. The control accuracy can be improved greatly in PMAC servo control system. And the following error can be reduced substantially, control algorithm of PID based on PMAC is given and tested by experiment of PID control performance.

Abstract: Failure Modes and Effects Analysis (FMEA) method has been used to study the reliability of many different power generation systems, making it easier to take actions to overcome such issues, thus enhancing the reliability through design. A FMEA Knowledge Base System was designed and realized in this paper, and this system was used to design new steam butterfly valve for steam turbine. Through the system designer will improve product quality, and reduce risk.

Abstract: A new cutting force model of ball-end mill with double effect is developed through analysing the machining process by using differential geometry. The cutting force model is needed to be revised for the component force in Z direction because of the offset to the actual results. The cutting force and the ball-end milling force coefficients can be given with numerical method. A feedrate optimization strategy is also proposed based on the developed cutting force model and tested effectively.

Abstract: Selective laser sintering (SLS) is one of relatively mature rapid prototyping technologies at present day. This paper takes the forming of a high voltage switch casting model in the AFS-3000 rapid prototyping system as example to describe the forming process of SLS, and introduce the casting model rapid prototyping technology based on SLS. This research provides a powerful technological support for rapid development of casting products.

Abstract: In the 5-axis machining, when the tool orientation approaches the one of the rotation axis, the sharp changing of the rotation angles obtained by the transforming of tool orientations causes a large over cutting or under cutting for the limit of the machine’s dynamic characteristic, which is called singular problem. After analyzing the causing of the singular problem, the position of singular point, the singular value and the nonlinear error, etc, an improved plane interpolation algorithm based on plane interpolation of tool orientation algorithm is given out in the paper following with the simulation and test of the circumference milling of the tilt plane (tilt angle: 1°) separately with the plane interpolation and improved plane interpolation based on a 5-axis machining center with two swiveling heads (rotation axes: C/A). The results prove that the new interpolation is valid and correct.