Advanced Materials Research Vol. 898

Abstract: Design of a ARM7 LPC2131 as the control core, through the H bridge chip LN298 driver power through the coil produces a changing magnetic field, the magnetic deflection force start swinging of the swing rod, the angle sensor (model MPU6050) feedback magnet swing angle signal, control coil magnetic field by using PID technology, so as to the electromagnetic force to precisely control the pendulum swing angle of the objective, by the TFT liquid crystal display pendulum swing angle, cycle, response time, stop time.

Abstract: Based on the multimedia control theory, the mechanical bionic intelligent control is studied, and this theory is applied to the subjectivity analysis of college students employment to establish the mathematical model of mechanical bionic intelligent control, and to design automatic control algorithm. In order to validate the effect of mathematical model and algorithm, this paper compares the designed adaptive algorithm with 3 kinds of traditional genetic algorithm. From the calculation, we find that the adaptive algorithm in the fitness value of the solution and the mean is obviously better than that of the traditional genetic algorithm. While for the search of the optimal solution, the adaptive algorithm is fast and has high precision. The crossover and mutation rate of 20-100 generation calculation results show that the mutation rate is controlled within 0.1, which can meet the design requirement of accuracy, and can provide a theoretical reference for the study of mechanical automation control theory.

Abstract: Light-emitting diodes (LEDs) are ideal candidates for the implementation of a complex network on a chip. Recent studies have demonstrated that LEDs with optoelectronic feedback loop display complex sequences of periodic mixed mode oscillations and chaotic spiking. In this paper, we propose a sliding mode control scheme for synchronization of coupled LEDs networks. Based on Lyapunov stability theory, the controller can stabilize the synchronization error dynamics around the origin point, thus robust synchronization can be obtained. A numerical example is given to illustrate the effectiveness of the proposed control scheme.

Abstract: A counting system based on AT89S51 and optoelectronic switch sensor is introduced which was installed in a sewing machine assembly line. The system is consists of microcontroller, keyboard circuit, signal detection circuit, watchdog circuit, clock circuit and display circuit. It can detect and display actual number of products on the assembly line. The experimental results show that the system has a high level of measurement accuracy and an anti-jamming capability.

Abstract: SOPC becomes popular nowadays, which combines software and hardware in a single chip. In this paper, a multi-axis motion controller is implemented based on a SOPC system with a NIOSII processor in a single FPGA chip. The motion controller includes DDA module, spindle module and NURBS calculation module realized in Verilog HDL. DDA algorithm is used to drive the motors while spindle module is to drive the spindle. Because of NURBS recursive nature, NURBS calculation module is used to accelerate the calculation which takes the advantage of parallel structure. The NIOSII processor realizes the feedrate scheduling, in which constant feedrate is adopted. The second-order interpolation algorithm is used to control the feedrate.

Abstract: Numerical control (NC) technology is a kind of technology combined with electronics, machinery manufacturing, and other interdisciplinary combination of technologies. It is an important part of modern manufacturing. Currently, NC technology is developing towards the open CNC system with extensibility and interchangeability, while the modern electronic technology is developing towards the programmable technology and SoC (System-on-Chip) technology. However, current CNC controller designed with SoC is still in the research stage and not practical yet. In this paper, a practical CNC motion controller is built with modern PSoC (Programmable System-on-Chip) with wireless Ethernet interface. This controller has a high-performance microprocessor, numbers of free configurable analog and digital devices and IO (input/output) interfaces, and many kinds of communication interfaces. Therefore, it has good real-time control functions and communication functions. Experiments for controlling a three joint-axis engraving machine show that the controller can achieve high performance of parallel control of the three joint-axis linear interpolation and two joint-axis circular interpolation, and high performance of the trapezoidal and S-shape speed control. In addition, in order to reduce the impact to the motor and increase the system efficiency, a kind of look-ahead algorithm for velocity control with low time cost is used.

Abstract: Take M210 internal grinder as an example, design a sensors of measure internal grinding force that not affected by vertical feed, determining the basic dimensions of the elastic element, analyzes the elongation of elastic curve after two fixed beam bending, the force of the elastic member is analyzed. The relationship of grinding force and parameter is established, it can be the reference of relevant manufacturing technology.

Abstract: In the implementation and design of the industrial control system, due to the difference between various processing equipment manufacturers, the communication protocol is not compatible with the existing systems or equipments that greatly reduce the process operation efficiency and the production efficiency of enterprises. This paper introduces the gateway communication between Siemens S7-400 PLC and the flue gas purification air subsystems in roasting, as well as gives a detailed discussion on communicational gateway board between Profibus-DP and Modbus-RTU, as well as the embedded software development.

Abstract: The rolling bearings fault feature under strong background noise is very weak for reasons of environment noise impact and signal attenuation. To extract the fault features of roller bearings effectively, a new method based on Minimum entropy deconvolution (MED) and slice bi-spectrum is proposed. The paper Firstly decreases the strong background noise of rolling bearing by the MED method, and then calculates the envelope signal of the de-noised signal. Finally, analyzes the envelope signal with slice bi-spectrum and extracted the fault characteristic frequency. The effectiveness of the proposed method was validated by analysis of both a simulated faulty bearing vibration signal and the experiment measured signal of rolling bearing, and it was also compared with the method of envelope spectrum.