Advanced Materials Research Vols. 546-547

Abstract: To the question that it was hard to measure and verify the safety design rationality of the performance parameters for the ultrasonic cleaning machine, the destructive effect mechanism of the ultrasonic cleaning was analyzed. It was indicated that the cleaning power and time were the two main factors for damaging the insulating layer of the cleaning objects. The measuring technology was presented by aluminum foil, and it analyzed feasibility and an area assessment method for the measurement method by aluminum foil. The practical long time test of the motor demonstrated that the measurement method by aluminum foil can provide safety design data support and experimental verification to the performance parameters design of the ultrasonic cleaning machine.

Abstract: Fault tolerant is one of major requirements for embedded systems. As the embedded systems become more and more complex, more chances for various fault. When design embedded system developer has to handle these faults. Before handling faults designer has to identify and understand the types and nature of faults.Faults is the sources for low dependability, faults can be hardware and software. Hardware faults can be distinguished from systematic faults like software or design errors. The Fault can be deleted, such as extensive testing or formal verification and tolerated by fault tolerance techniques. We restrict ourselves to the problem of fault tolerance and refer to other methods for troubleshooting.This paper discusses a new design method about the fault tolerant system of embedded system. We designed a fault tolerant system of data acquisition system in dynamically re-configurable FPGA. The experiment results show that the system not only be able to higher self-adaptive ability and reliability, but also can Through the FGPA to complete a specific algorithm.

Abstract: Theory of SRM position detection based on exciting pulse voltage to no conduction phase is analysised, and a combination with BP (back propagation) neural network model to predict SRM rotor position without sensorless is proposed. Training sample and test sample can be obtained by SRM detection system with position sensor, with response current as input, and the rotor position as output, a single input and a single output of BP neural network model is built. Mapping between response current and rotor position are obtained by training BP neural network, and the rotor position prediction is realized, test sample is used to verify the BP neural network model. Simulation results show that this approach improves the detection accuracy compared with the method by injecting exciting pulse voltage.

Abstract: A design and realization of embedded High-speed image stabilization device is present to remove unwanted shaking phenomena in the image sequences captured by the high-speed industrial camera with 256x256 pixel @1000 frames per second, 8bit, Gray scale. Each module design of the mentioned device is introduced in detail. The interested image sequences are transferred through camera link interface to the device, buffered, preprocessed by an FPGA, and processed by DSP to achieve two-dimensional motion vector which is exported by a digital-to-analog chip. The test result shows that the image stabilization device works stable, real-time, high-accuracy.

Abstract: When an object crosses the source-receiver line, a weak acoustic field aberration is produced. However, it is often overwhelmed by the fluctuation of direct blast. A principal component analysis of stable portion of beam output on vertical receiver array is proposed to enhance the field aberration for forward detection. A lake experiment utilized a vertical receiver array spanning the water column was conducted. A 10 kHz pulse was transmitted successively, and the field aberration caused by the forward scattering of the crossing object was observed. The beam output waveform at the horizontal direction is processed with the proposed method, and the field aberration about 10dB above the background acoustic field is achieved, while the maximum aberration is only about 2dB above the background field before processing.

Abstract: This paper analyzes the problems which exist in finite element calculations of the earth dam seepage which is free surface solution, cell subdivision improper, the transformation of the free surface boundary conditions and the permeability coefficient values at the interface of different materials, boundary conditions and other issues. Put forward the corresponding solution. Applies common general finite element software to calculate the seepage. Works in conjunction with a stable levee seepage analysis and get better results.

Abstract: This paper is for ordinary lathe supporting and design the capture of manipulator. Practice has proved, industrial robots can replace the hands of heavy labor, significantly reduce the labor intensity, improve working conditions, and improve labor productivity and automation level. In addition, it can be in high temperature, low temperature, deep water,cosmos, radioactive and other toxic, pollution environment conditions operation, more shows its superiority, with broad prospects. In the paper, the structure of the manipulator model design and Cortex-M0 micro controller (hereinafter referred to as M0) as the main controller in this paper. With multiple steering gear as the basis, make manipulator model, through the realization to the output M0 PWM control more than the steering gear, and finally achieve the acquirement manipulator workpiece, and the workpiece in designated spot.

Abstract: This paper presents a new VCXO frequency source based on the GPS module, atomic clock in system and loop compensation circuit, the accuracy of the system, long-term stability, and short-term stability can be improved because of its new structure. Specific description of the closed-loop lock works, including the compensation circuit of the machine.

Abstract: The rapid development of various kinds of aerospace application systems requires the appropriate high-accuracy time and frequency standard. This problem can be effectively solved by establishing suitable time and frequency standard in aerospace. Based on the establishment of aerospace satellite visual model, the simulation of satellite visual time on 3-layer constellation structure, including GEO satellite, IGSO satellites and MEO satellites, has been conducted. The visual features of this constellation have been gained. Combining with the major influencing factors of satellite clock correction error, aerospace time synchronization architecture on the basis of layering has been proposed. The time synchronization algorithm in line with this architecture has been researched. The results show that aerospace time frequency standard established based on this layering time synchronization architecture can meet the demand on high-accuracy time frequency of future aerospace application systems.