Applied Mechanics and Materials Vols. 444-445

Abstract: For resolving the obscurity and complexity problem of equipment fault diagnosis training, gave out a fault diagnosis simulation training method. Based on the fault tree theory, the method can create the training simulative scenes, by building up the mapping between the fault tree node and the simulative scenes node. With the training subject and complexity requirement, this method can control the randomness and complexity of the training sample, the simulative scenes also can improve the training effect. And the fuzzy reasoning result assessment method can give out the proper training mark.

Abstract: Closed-loop control for underwater heat-engine propulsion system is an essential solution to improve the control performance and optimize the autonomous underwater vehicles (AUV) trajectory. This paper minutely gives the project of the closed-loop control proposal we propose for the propulsion system, and puts forward a control arithmetic according to the mathematical model that has been build for the system. Even more remarkable is that a series of experiments are carried out on the semi-physical simulation test bench to verify the control arithmetic. The experimental results and the analysis indicate convincingly that the control arithmetic can compensate for the navigation depth and attitude of AUV, thus making the propulsion system get the ability of tracking the variable working condition. Therefore, the power system gives full play to its potential.

Abstract: The primary mission objective is gathering information of the Earth by on-board instruments using remote-sensing techniques, and sending the useful information back to the ground. Its mission design and analysis involves identification of critical requirements, determination of mission orbit, analysis of relationship between satellite, the Earth and the Sun. This paper proposed a new scene simulation system based on distributed architecture, which consisted of mission design subsystem, numerical simulation subsystem, scenario display subsystem and model management subsystem. The system can show the updated mission status and performance rapidly and efficiently after user modified the initial mission parameters. Practice has proven that it can help users to make a decision and judgment for the mission design, and improve their work efficiency.

Abstract: This paper developed a kind of non-destructive measurement for the growth process of constructed wetland plant: doing image acquisitions of constructed wetland plant regularly through digital camera imaging; introducing image files to computer through interface, displaying them on the screen of computer; developed constructed wetland plant image and growth information extraction software under Visual C++ compiling integrated environment, users could acquire plant contour (realized by image edge recognition) and plant size (characterized by top projected leaf area) through human-machine interactive operation; designed constructed wetland plant (Phragmites communis) experiment to analyze the biomass change during the non-destructive measurement process. The biomass had good correlation with manual measured individual plant height, which proved that computer image processing based non-destructive measurement can provide reliable predictions for plant growth parameters.

Abstract: A complete numerical simulation system includes mould-building, needed data preparation, calculation and demonstration. The system compiles by Microsoft Visual C++, with friendly interface and easily operation. The system can carry out 2D and 3D current, salinity and sediment. In the course of calculating, the real time change course of each physical quantity can be shown.

Abstract: A field experimental project was carried out in Jingzhou City, Hubei Province to research the effects of controlled drainage on groundwater table and drainage discharge. And used DRAINMOD model to simulate the designed experiment schemes. The results showed that the numerical results of the groundwater table from DRAINDOD model were quite similar to the practically measured results during cotton growth period, the correlation coefficients were more than 0.9, the simulation results are in line with the experiment results. The underground drainage discharge of each plot was passively correlated with controlled water level, while the surface drainage discharge was positively with it. The underground drainage discharge was larger than the surface. The total drainage discharge was also passively correlated with the controlled water level. The DRAINMOD model can provide good estimates of the groundwater table and the drainage discharge under controlled drainage.

Abstract: Based on existing mathematical model for one-dimensional unsteady flow and non-uniform water-sediment, the inside boundary condition of sluice has been introduced to establish a mathematical model which is suitable for sediment and water quality in nontidal river channel with sluice, in combination with empirical model of local erosion-deposition and one-dimensional mathematical model for water quality. It can be used to simulate motion of water flow, sediment and pollutant under different operational modes of sluice in tidal reaches. In addition, a mathematical model calculation software for water-sediment and water quality has been developed on this basis after sluice has been built, which is also being used to study the influence of different application solution of sluice in Yongding New River on the motion of sediment and pollutant, so as to provide a basis for the selection of sluice operational modes.