Applied Mechanics and Materials Vols. 130-134

Abstract: The market share for sport utility vehicles is becoming increasingly very fast in recent years. Many auto companies are stepping up the work of research and development the new model of SUV. A new SUV body modal is studied in this paper. The finite element model of the SUV frame is built by the HyperMesh and the SUV frame modal is researched by the Nastran. Low-order vibration mode and the first bending and torsion modal strain energy distribution of the SUV body structure are obtained, and the SUV body structure of the dynamic performance was assessed in this paper.

Abstract: At present, the ballistic Target tracking has a higher demand in convergence rate and tracking precision of filter algorithm. In the paper, a filter algorithm was improved based on particle filter. The algorithm was carried out from the aspects such as particle degradation and particle diversity lack. A novel ballistic coefficient parameter model was built, and was expanded to the state vector for filtering. Finally, the improved algorithm was simulated by MATLAB software. The simulation results show that the algorithm can obtain better convergence speed and tracking precision.

Abstract: To investigate the effect of design parameters with statistical characteristics on ballistics performance, sensitivity analysis of the flight range objective with respect to relevant parameters was conducted to demonstrate it. Statistical parameters were modeled using an iterative method in order to determine descriptive statistics for further sampling. Simulation of flight range based on a dynamics model was then carried out. Finally, sensitivity derivatives from the baseline design scheme were calculated to locate the most sensitive parameters which can be controlled specially for better performance. Results show that by sensitivity analysis, thrust parameters affect the flight range objective obviously while others not, which provides suggestions about whether some parameters should be limited in a range or not.

Abstract: To locate the fire station under a prescribed period is of strategic significance in the urban fire planning. On the .Net platform, integrate the Genetic Algorithm and Geographic Information System (GIS) via the C# language to resolve the complicated issue of the spatial site selection. The GIS spatial data will be imported to the module first. Then on the basis of both the spatial analysis feature and the network analysis feature of GIS, calculate the individual’s fitness in the process of the genetic evolution. The Conventional coding approach is generally utilized to optimize the small-scale data set. However, to meet the search requirements in the massive spatial data of GIS, the object oriented coding approach is designed in the module. It is indicated that the entire module is able to resolve the site selection issue of the urban fire station properly, which meets the quick response’s requirements.

Abstract: A method for analyzing the textural features of image is put forward by using the wavelet decomposition. That is used to measure color difference of ceramic tiles on-line. A linear array color CCD camera is used to grab the image of ceramic tiles, and then the image is pretreated. Two level wavelet decomposition is used on the ceramic tile image, and the energy feature of each sub-graph is extracted. The energy feature will be used as a feature matrix,and it can be carried out the classfication according to minimum distance classifier. It can reflect spatial relationship of color more effectively, when contrast with the color histogram, which is used as a traditional method. Experiments show that it is effective using wavelet analysis on image processing,and the sort results are approximately in accordance with the artificial detection.

Abstract: With some theory about continuous and impulsive dynamical system, an impulsive model based on a special predator-prey system is considered. We assume that the impulsive effects occur when the density of the prey reaches a given value. For such a state-dependent impulsive system, the existence, uniqueness and orbital asymptotic stability of an order-1 periodic solution are discussed. Further, the existence of an order-2 periodic solution is also obtained, and persistence of the system is investigated.

Abstract: This paper presents the numerical simulation of a 48t/h biomass fired grate boiler with an inner boiler dust removal device located in the third pass. The results show that the inner dust removal device can correct the decline of the gas flow in the passes effectively on the basis of dust separation. The best air flow ratio of R_PA: R_SA: R_IA is = 4: 4: 2 correspondingly. Therefore, the new inner dust removal device should be applied in current commercial biomass boilers to improve their operation performance.

Abstract: The fly ash and ash of different biomass power plants are selected as research objects, of which the combustion characteristics are studied. At the heating rates of 50°C/min, at the final reaction temperature of 900°C, and under the condition of air as carrier gas, weight loss curve and weight loss rate curve are analyzed respectively. TG, DTG curves of fly ash and ash from different power plant are gained, different combustion conditions are studied, and combustion kinetic equations of different biomass fly ash and ash are established, kinetics parameters are obtained by the Coats-Redfern method. Besides, combustion condition and reburning feasibility of different biomass fly ash and ash are analyzed, which provide a theoretical support for biomass power plant operation, such as improving their fuel burn rate.

Abstract: This paper presents the drying characteristics of rice husk and cornstalk with high moisture content at fixed temperatures. Experiments were performed in an oven drier, to reveal to the effects of initial moisture content, bed thickness and drying temperature on the biomass drying characteristics. The results indicated that the drying time was decreased as the rising of the drying temperature, and increased along with the initial moisture content and bed thickness. Moreover, the risk husk was easy to be dried than the cornstalk.

Abstract: A double-grate biomass direct-fired boiler is designed and modified with connected reciprocating grate and oscillation grate based on a 48t/h boiler current operation status. Ribbon and smoke are used in the cold experiments which are based on the reformed hot conditions to verify the model reliability. To have well comparison with the model result, the air ratio and inlet angle of the second air are changed and used to obtain the characteristics of the flow field of the actual grate boiler furnace. And it is the best working condition that the ratio of the air distribution primary air: second air: ignition air is 4: 4: 2, frontwall second air: backwall second air is 5: 5, the inlet angle of the frontwall second air rises 10°, the inlet angle of the backwall second air is in equilibrium position.