Advanced Materials Research Vols. 875-877

Abstract: According to the requirements of sealing a deepwater motor on an underwater device, the overall structure of the magnetic-driven sealer is designed, and its magnetic structure is determined in this paper. The arrangement of magnet is researched and determined, a reasonable aspect ratio of the magnetic circuit is chosen as well. The problem of reasonable matching between thickness of permanent magnet and the arc of active surface of magnetic pole is analyzed, and the operating point of permanent magnetic materials is determined. The torque of magnetic circuit is calculated, the power matching and correction are studied, and the design and calculations of the torque of magnetic-driven sealer are completed, and the dimension of the overall structure is designed. Permanent magnetic materials, soft magnetic materials, yoke steel material and the materials of isolated sets are analyzed, respectively, and at last reasonable materials are chosen. Moreover, the design of isolated sets is accomplished, and the loss of eddy current and the hydraulic friction, existing on magnetic-driven sealer, are analyzed and calculated. Based on the calculation of analytical method and by using software of ANSYS, the magnetic circuit of magnetic-driven sealer is simulated and analyzed. The magnetic field distribution of model is analyzed when the angle difference, the number of the magnetic poles or thickness of yoke steel is changed, respectively. In conclusion, the simulation results are consistent with the theoretical calculation.

Abstract: Safety is an element of extreme priority in mining operations; currently many traditional mining countries are investing in the implementation of wireless sensors capable of detecting risk factors. The objective of this research is to contribute to the implementation of sensors for continuous monitoring inside underground mines providing technical parameters for the design of sensor networks applied in underground coal mines. The analyzed of applying these systems in terms of Benefit, Opportunity, Cost and Risk are discussed. Finally, a dynamic assessment of safety at underground mines it is proposed, this approach offers a contribution to design personalized monitoring networks, the experience developed in coal mines provides a tool that facilitates the application development of technology within underground coal mines.

Abstract: For reducing the dimensions of feature set and the amount of calculation in fault diagnosis, discrete immunity feature set optimization algorithm is put forward in this paper. Vibration signals are tested from laboratory gearbox under four specific conditions. Twenty-five kinds of feature parameters of those signals are extracted as the initial feature set. Distance-based objective function is established for the algorithm. By discrete binary encoding, immunity cloning, mutation and selection operating, the feature set is optimized. The optimal set includes eleven kinds of feature. Compared with the initial feature set, the application of optimal feature set in gearbox fault diagnosis has reduced computation and improved the diagnostic accuracy and efficiency greatly.

Abstract: Removed at authors request

Abstract: This paper applies the SmartModels approach for building software product lines (SPL), illustrated through the example of modeling a mechatronics framework for designing anti-lock braking system (ABS) embedded software solutions. This example proves the expressiveness of the SmartModels approach to capture within a model sufficient meta-information to enable the design of families of entities from the mechatronics domain, taking advantage of the polymorphism and abstraction properties of object-oriented approaches and parameterized genericity.

Abstract: In order to analyze the fatigue of the airborne product structure, the modal analysis and random vibration analysis are conducted for the product by using the finite element analysis software ANSYS. The modal analyzing results are compared with the modal test results and the finite element model is corrected. The stress response power spectral density is obtained from random vibration analyzing. A frequency domain method for calculating the fatigue damage of the structure is presented. The simulation results are in agreement with the reliability enhancement testing results. An optimization scheme for the product structure design is given.

Abstract: This miter gates of Three Gorges Dam and Gezhou Dam open and close frequently under low speeds and heavy loading conditions. The moving componets, including hoist, door shaft, roof pivot and bottom pivot, work long-term and go wrong easily. The traditional periodic maintenance and fault overhaul are ineffective and may cause damage and waste. With the No.1 ship lock maintenance of Gezhou Dam, the top pivots poor lubrication operating mode was simulated. The vibration signal of top hub reinforcement plate was collected before and after overhaul, then several signal processing and analysis techniques were selected for research on fault diagnosis methods. The results illustrate that it is feasible to achieve miter gate faults diagnosis based on vibration signal detection technology, which has certain guiding significance on miter gate maintenance.

Abstract: Pico Satellite Telecommunication with Ground Station (GS) is Characterized by a Limitedline of Sight that Affects Transmission Delay and Data. in this Paper, a New Fuzzy Logic Control Systemmodel is Proposed to Ensure a Long Lasting Ground Station (G.S) Visibility to Pico Satellite Duringorbiting in Leo. Developed System is Helpful to Control Wave Propagation for Transmission. Presentedmethod Describes a Fuzzy Switching Control System for both Side Microstrip Antennas Array Systemmodel that Guarantee a Maximum Transmission Time and Achieves Small Satellite Communicationcontrol Performance with Simplified Control Scheme. the Method Includes Switched Systemmodeling, Fuzzy Control System Design, and Optimized Fuzzy Modeling Algorithm; in Addition Petri Netmodeling is Developed to Predict System Behavior. Added Algorithms were Simulated and Tested.Proposed System and Integrated Algorithms Performance were Demonstrated in the Reportedsimulations and Tests Results.

Abstract: The transit motion and the rotating motion have highly different effects in a technical systems and have almost nonlinear system behaviors. For the descriptions of their dynamical causes and effects on system, the physical information, which is concerned as a nonlinear mathematic model, has been used. But the corresponding equations are generally not easy to solve in complete form or their solutions are so complicated to see through the coherence. A common way to settle such a problem is to linearize system exactly in a state space or on a operating points with Taylor's series approximately. An advanced method to an approximation is a bilinear system that offers global separations principle. In this paper, an extended application of this theory is given in a modeling and control on the electro hydrostatic cylinder driver with both the transit and rotating motions for the keel system that mostly have not only advantage of high performance, small volume of building and weight but also high nonlinear behavior.

Abstract: In order to determine the vibration characteristics of the reciprocating compressor on the offshore platform, the vibration signal from the reciprocating compressor on the offshore platform was investigated by applying the harmonic wavelet packet transform. The energy variation of vibration signal under the different frequencies was discussed. It was shown that the vibration energy of the reciprocating compressor in the horizontal and vertical directions is mainly concentrated in the low frequency of 25Hz and 50Hz, and the vibration energy of other frequency is small and smooth. In the axial direction, the vibration energy of the reciprocating compressor extends to the medium-high frequency, and the large energy appears in the 225 Hz. Therefore, the harmonic wavelet packet transform can be used to research the vibration characteristics of the reciprocating compressor on the offshore platform.