Applied Mechanics and Materials Vols. 496-500

Abstract: Walking is a basic function of humanoid robot, this paper presents key ideas of stereo vision based humanoid walking. Image processing techniques and pattern recognition techniques are employed for the obstacle detection and object recognition, data fitting technique is also used to plan the path of the humanoid robot. High precision visual feedback is provided by the combination of real time high precision feature detection and high actuary object detection method. The proposed stereo vision based approach and robot guidance system were evaluated partly by experiments and partly by the simulation with the humanoid robot.

Abstract: In view of the existing problems in compressor control system, this paper introduced the applications of a PLC-based industrial Ethernet network control in the compressor, and had a full represent to the systems design and implementation process.

Abstract: The existing problem of current laser pulse receiving system is that the laser pulses width is too narrow to be directly collected. And the consistency of the four signals acquisition is very strict. To deal with these problems, a new design of laser pulse receiver will be introduced in this article. This laser pulse receiving system includes the following structures: new high-speed laser pulse receiving hardware based on CPLD and Four-Quadrant Detectors, new peak-hold circuit of laser pulse, high-speed parallel ADC system, and processing data with fast interpolation algorithm in a Floating-Point DSP. Through the new design of high-speed parallel ADC system, the receiving system is able to simultaneously complete the timing of four high-speed laser pulse signals acquisition and the storing of data. The new construction of high-speed parallel acquisition is a core module in this design. And a new flow how to the DSP handle the data with fast interpolation algorithm will also be introduced in this article.

Abstract: The actual manufacturing enterprises are characterized by frequently changing market demands, global competition, rising require production systems concerning flexibility and adaptability, besides exigency for new industrial control systems providing lower time-to market and shorter product cycles. The inflexible communication infrastructure between the manufacturing process elements difficulties the adoption of porting production with high degree of reconfigurability and interoperability. The adoption of a service-oriented architecture (SOA) can bring real benefits to the industrial automation communication. Service-oriented architecture provides a flexible, open solution for manufacturing plants. Besides good endeavors proposed by consortiums and standard institutions, the market still shows the dominance of proprietary standards. In oil fields, managing the new technologies requires from the decision-making an integrated analysis of data that enables the understanding of interventions in the field in a comprehensive manner. For this, we propose a context-oriented framework to exploit Internet-based business models beside Service-oriented Architecture principles that relies on service oriented paradigm and open standards as, Webservices, XML, and Devices Profiles for Web (DPWS). This higher integration can affect daily oilfield operations, and the vision for an autonomous industrial automation as simple as plug and play.

Abstract: We analyze the reasons why DC-DC switching power supply generates the electromagnetic interference (EMI), and through the FPGA control the digital-to-analog converter (DAC) to output the pulse width modulation (PWM) signal with high precision and slew rate controlled, the slew rates of the voltage and current of external N-channel MOSFET are controlled. So, dv/dt and di/dt can be decreased in the circuit; and the ripple noise and EMI of switching power supply are reduced vastly in this way. Experimental results show that the ripple noise of switching power supply could be reduced by 80% and EMI reduced 15dBμV. The experiment has proved that we can cut down the ripple noise and EMI of switching power supply by lessening the slew rates of the voltage and current of MOSFET switching tube.

Abstract: Temperature control problem is a typical multi-constraint/multi-objective nonlinear programming problem in diamond synthetic chamber and it cannot be solved by conventional methods. This paper proposed a constraint multi-objective particle swarm optimization (CMOPSO) algorithm to solve the problem. Simulation results show that the CMOPSO algorithm can be used effectively in diamond temperature control and it has strong convergence optimization abilities for all different parameters and constraint conditions.

Abstract: In this paper, through analysis on characteristics of the operation of the mine fanner, According to the requirement of low speed and smooth operation and quick response for AC speed regulating system of mine fanner, a new control system that based on vector control of Fuzzy-PID was designed. The simulation model was simulated and analysised by MATLAB/SIMULINK. The result indicated that the vector control of Fuzzy-PID system can not only quickly responded to the change of the load torque but also have good speed control performance, and has reliable engineering practical value.

Abstract: A model is established to research on the applicability of network protection in theory. In this model, distributed power generation with constant power (PQ) control mode which is equivalent to a voltage control current source is taken as the research object. Fault ride-through control theory is used to analyze the influence on the network protection exerted by three-phase short-circuit fault. In this paper, the equivalent model of the distributed generation is offered firstly. Then the three-phase short-circuit fault characteristics are illustrated based on the equations of the access points voltage and the distributed generations current. In the end, a simulation model is built to verify that the network protection can be applied to settle the three-phase short-circuit fault in the distributed network with distributed generation.

Abstract: This paper proposes a silicon-based ultrasonic scalpel for minimally invasive surgery. Starting from the fundamental theory, the micro ultrasonic scalpel based on exponential silicon horn chip is analyzed and designed in detail. Then a micro scalpel has been fabricated by using MEMS technology and tested. Results show that the micro ultrasonic scalpel presented in the paper has a good performance in vibration and fit for cutting biological tissues at the micro/nanoscale.

Abstract: A wide range of micro-components can today be produced using various micro-fabrication techniques. The efficient high volume assembly of complex micro-systems consisting of vast single components (i.e., hybrid micro-systems) is, however, a difficult task that is seen to be a real challenge for the robotic research community. It is necessary to conceive flexible, highly precise and fast micro-assembly methods. In this paper, a frame of a micro-assembly system in the form of flexible micro-assembly line and its autonomous control is presented. Implementation of the control system are described and the procedure of autonomous control is described as well.