Advanced Materials Research Vol. 981

Abstract: Based on the theory of information and structure entropy, this paper analyses the influence of collaborative command and control system on information flow. Two concepts, time-effect and equality of information flow, are introduced, and the time-effect quality model is established, which can be used for evaluating the order degree of collaborative command and control system. Centralized, recursive and network cooperative structure and its time and space complexity respectively discussed. Study has shown that the recursive cooperative structure under the control of the command center is a relatively good structure.

Abstract: This article designs a servo control card based on PCI9052 for the motor control of large CNC cutting machine. The design contains the hardware design of circuit and the software design of drive. The hardware design used PCI9052 to realize the communication of the host and the PCI bus, and realized the internal logic control of data communication on hardware circuit of CPLD by Verilog HDL language. Devised the hardware system principle and PCB diagram, producted circuit board by Altium Designer 6.9, and and finally debugged successly. The software driver design analyzed the relationship between Linux kernel and the device driver, proposed the servo control card design process according to the structure of Linux device driver, completed the identification and communication to servo control card by Industrial PC. The analog, switch and pulse transmission integrated on the same circuit board is different from previous, and it obtained a stable application in a number of CNC equipments.

Abstract: In this paper, a nonlinear observer is designed for a servo system with non-linear dynamic friction. With this kind of observer, the dynamic friction can be estimated and then be compensated using the input and output data on-line. A recursive formula of the nonlinear observer is derived by using the block pulse function which can be easily implemented on-line with microcomputers. The designed non-linear observer is applied to high accuracy servo system running at very low speed and prove to be effective and satisfactory.

Abstract: A solar tracking device was designed in this paper. First, In order to determine the initial direction of the mechanism and the east, HMC5883L was used for measuring the magnetic field of earth. Then, the mechanism began to operate according to the solar position which was confirmed though the astronomical calculation. Finally, the azimuth and the elevation angle of solar were measured and corrected by HMC5883L and MPU6050 respectively. HMC5883L was calibrated by the ellipse fitting, which was obtained though the least square method. The horizontal error of HMC5883L was compensated. The experimental study was performed. And the results show that the solar tracking device has the characteristics of stable operation, high flexibility and low requirement of installation precision.

Abstract: Compared with the closed-loop drive circuit in micromechanical gyroscope of AGC principle, the closed-loop driver circuit based on the phase locked principle can overcome its shortcomings which cannot control the frequency characteristics of the output signal, reducing the frequency deviation and the frequency jitter of the output signal, and shortening the settling time of the closed-loop drive system. In this paper, the noise of the closed-loop phase drive circuit based on phase locked principle is analyzed and deduced its phase noise expressions.

Abstract: A lab platform of Open Numerical Control System was designed to develop NC system based on PC and Motion Controller, a Master-Slave control system. The user interface application software was developed by C++ Builder and WINDOWS. It realized explanation and testing for bug function, data pretreatment function, NC code translation, NC simulation and execution, as well as motion controller function.

Abstract: The Stability of SG water level plays an important role in the safety of nuclear power plants, but tuned the parameter of water level PID controller is hard. Proposed a novel algorithm, KIPSO, which tuning PID controller parameters. Determine the cluster centre through K-means value cluster algorithm, and take the cluster territory as the characteristic value of vaccine set, enhance the vaccine multiplicity. Updated vaccine extraction by self-adaptive method, improved the convergence and adaptability. Analyzed the algorithm robustness in detail, and gave the rule which the immunity selection parameter. The simulation results shows: compares with the PID controller whose parameters are tuned by ZN method, KIPSO have a smaller overshoot, a better stability, and a shorter adjustment time. The simulation results show that the proposed method is effective for tuning PID parameters.

Abstract: This proposal focuses on the interventional MRI technology and the MRI compatible robots which are used to overcome some limitation of the MRI. In the introduction part, the development and the limitation of the current MRI interventions are introduced and a possible solution, MRI compatible robotic assistance, is proposed. In the design part, the specification of the MRI robot is discussed, including the MRI compatible material, the motor and encoder, the control unit and the combination of haptic sensor. Finally, the possible future application of the MRI compatible interventional robots is introduced.

Abstract: In recent years, Mobile computing and intelligent household hot topic, more and more get the attention of people. The current smart home systems for self-help to collect information about the indoor environment, at the same time can also interact with the user, but the system when the user needs to send control commands always spend time learning about the current state of household environment, manual control will become a kind of bondage. So this paper using a user activity recognition system based on smart phone, its main function is based on the current user on sensor information to obtain the user's current activity, the current environment control command. Combining the system and smart home system, family equipment according to the user's activities independently adjust to cooperate with users, users are more focused on the main transaction processing. This paper will be focused on energy saving problem, smart home system based on smart phone user activity recognition and the coordination between them.

Abstract: In order to improve efficiency of the cutting tool in the practical production process and mend the phenomenon of disjunction between previous NC cutting tool matching and cutting tool management, integrate matching with management of cutting tool and regard Access as the backstage database and apply VC++6.0 software to develop database management systems of cutting tool matching and management. The production process of cutting tool efficient matching and the management process of cutting tool information is studied, according to the application requirements of system, then the function target of the system realization is established, the overall structure model of the system is constructed and the function and operation procedure of each functional module is designed.