Advanced Materials Research Vols. 816-817

Abstract: The attitude maneuver duration is an important constraint for an agile Earth observation satellite between its imaging tasks. A method for calculating the attitude maneuver duration from pointing to the last observation target to the next one is proposed. Based on this method, the relationships between the observation times and the attitude changing duration are discussed. The analysis results show that the difference of the observation time and the observation target causes the difference of the attitude maneuver duration between the last and next observation tasks. An attitude maneuver strategy example for an agile satellite in one-orbit strips-jointed observation mode is given. The results of the relationships analysis validate the effectiveness of the attitude maneuver strategy.

Abstract: Responding the green commuting, Solid Edge V18 drawing software for the shape and function improvements of existing bicycle is proposed in this paper. This bicycle achieves the role of rain, shine dual-use and loading. It also satisfies the function requirements that people live in contemporary on bicycles. This article will elaborate the transmission device calculation and bicycle design based on Solid Edge Modeling.

Abstract: In this article, finite element method is used to analyze the random vibration of the pressure vessel under the action of earthquake. The result shows that the maximum stress values are located at the bottom of the pressure vessel. At the same time, fatigue in this location has been analyzed. It can come to a conclusion that this pressure vessel meets the requirement of fatigue strength.

Abstract: The thermal loss from the exhaust flue gas accounts for a large proportion of the thermal loss in the boiler. Under the pressure from the strict emission reduction policy and the rising fuel price, how to improve the fuel utilization ratio and reduce the coal consumption rate is of great significance in the electric industry. Based on the conventional waste heat recovery system, this paper proposes an integrated waste heat recovery system in reference with the German Niederaussem power generation unit. The integrated system improves the fuel utilization ratio and effectively utilize the waste heat with great economic benefits.

Abstract: In order to prevent voltage collapse while the voltages drops, adopts under voltage load shedding (UVLS) clustering control to recover voltage stability. First using the method of sensitivity sorting to cluster the load node, then using PV curve to calculate and determine the number of loads to be shed, finally the same cluster taking the same control parameters to shed the loads, the simulation validate it could recovery voltage stability and embodies the rationality and economical efficiency of this method.

Abstract: The presence of a tumor inside biological bodies is known to cause increases in the temperature of surrounding healthy tissues. In the field of ophthalmology, the effects of tumor on the ocular temperature distribution have been rarely investigated, but a few experimental studies have shown that eyes with choroidal melanoma presented increases in the corneal surface temperature. Thus, the objective of this study was to simulate the thermal effects of an eye tumor on the ocular temperature distribution. The tumor was simulated as a circle, located at the interface between the sclera and vitreous. Variations in tumor size were evaluated. All simulation studies were based on the finite element discretization method (FEM), with the eye being approximated by a two-dimensional domain. Simulated results were compared to experimental data (obtained for healthy eyes employing a thermocamera), with satisfactory agreement (average % error < 1.8%). Simulations also showed that the presence of the tumor caused an increase in overall temperature values, mainly due to the effect of the more intense metabolic heat inside the tumor.

Abstract: Naturalistic walking is one of the most important purposes of researches on biped robots. A feasible way is to translate the understanding of human walking to robot walking. One of the options that affects the quality of motion in a biped robot is concerned with trajectory generation. So, in this paper it's focused on trajectory generation methods for implementing a 7-links planar walker biped robot. Also, this model is simulated by VisualNastran software package and run according to a Clinical Gait Analysis (CGA) reference that has been modified for a planar model. Lastly, the results of simulation are reported.

Abstract: To meet the need of multi-channel DC power supply to activate multiple macro fiber composite (MFC) material simultaneously, a novel multi-channel adjustable DC supply using single-input single-output transformer based on spectral separation is proposed. A hybrid signal containing multiple frequency bands is boosted to obtain a high-voltage signal without bands change. Several frequency selection circuits are then used to separate individual signals in different frequency band from the high-voltage signal. Finally, these signals are rectified and filtered respectively to obtain multiple channel DC voltages. The feasibility of the proposed scheme is analyzed theoretically and verified by simulation. Experimental results prove that each part of the scheme runs reliable and the output is stable and adjustable.

Abstract: The method of uniform design is applied in this paper to obtain the design of computer experiments and 3 factors (11 levels for each factor) are selected. The Gaussian Kriging model is built on the basis of the computer experiments results and will be used as a surrogate model for the optimization design of the front platen. 10 design points are selected to verify the prediction ability of the Gaussian Kriging model after it is obtained. It is shown that the maximum of the relative error of the Gaussian Kriging model is 2.53% and the minimum is 0.63%. Therefore the Gaussian Kriging model built in this paper is effective and practical for the optimization of the front platen. This paper provides a convenient method for the designers in the optimization for parts that have very complex geometry (not only for front platens). Meanwhile, the building method for the surrogate model is also very useful when the computing cost of the FEA for the real system is very large.

Abstract: The simulation method of reservoir tectonic and present stress field was recommended, and in-situ stress distribution of C8₂ ultralow permeability reservoir formation in Changqing oilfied Z19 well block was computed. The method is based on finite element analysis, of which the contents and procedures include geological model establishment, calculation model establishment and results analysis. The simulation precision depends on the reliability of models. Inversion criteria need to be set to determine whether the ultimate simulating result is reasonable. Main inversion criteria include absolute inversion, principle stress criteria, deformation criteria, etc. The maximum principle stress value of C8₂ formation in Z19 well block is between 35.7 and 45.2MPa, whose direction is NE 72o-80o, and the dominant direction is NE 75o. The differential stress value is between 0.4 and 9.8MPa. The relationship between stress, reservoir parameters and production data was discussed. The simulation results can be taken as reference for well pattern design, optimization and overall fracturing design.