Applied Mechanics and Materials Vol. 678

Abstract: Based on the research and analysis of power balance calculation method for the whole vehicle electrical system, example of specific project, detailed analysis and statistics of the whole vehicle with electrical power demand in different work conditions. And analysis and design the key parameters on the battery capacity, the size of the generator and starter. Preliminary verify the proposed method feasibility through specific calculation in this paper.

Abstract: Drive axle housing is an important part in heavy truck. 3D model of the axle housing was made by software UG. The finite element model of automobile drive axle housing was built with simulation software NX.NASTRAN and the finite element modal analysis was achieved. 1-6 order natural vibration frequencies were got under three kinds of working condition which were the maximum traction force, the maximum vertical force and the maximum lateral force. The vibration frequency was far greater than the natural frequency in the actual work. The security of the drive axle housing has been validated.

Abstract: I-II mixed mode fracture under two kinds of load manners was carried out, and it was also simulated by the ANSYS, and the test results and the simulation results were compared and analyzed, and the reasonableness of the model built and the effectiveness of test were verified. The failure process of fracture under the loading could be judged through the development of the crack tip combined with the stress nephogram and strain nephogram when cracks initiation at crack tip, and it provided the basis for the crack damage judgment.

Abstract: The model of wind turbine was created by CATIA software, and then the simulation for blades and wind field was conducted by ANSYS software. The phenomena, such as tip vortex of blade, center vortex, and spiral trailing edge vortex caused by the rotating wind turbine, were presented explicitly and the pressure distribution of wind field was obtained. This paper provides some guiding significance to the arrangement of wind turbine and the studies about loading, deformation, and stress of blades.

Abstract: The vibration was severe for a runner chamber of a large hydraulic bulb tubular turbine, which caused some cracks. The PRO/E software was adopted to establish a 3D model of the runner chamber. Based on ANSYS Workbench V14.5, a modal analysis was done. Its natural frequencies and modal shapes were obtained. The influence on modal characteristics with the runner chamber’s structure was discussed. The study shows that the reinforce stiffener’s thickness, the circumferential endlessband and their thicknesses have few effect on the modal characteristics of the runner chamber, the latticed reinforce stiffener has more effect on the modal characteristics. These results will provide the basis for product optimum design, so that its natural frequencies stagger these frequencies of field vibration, the resonance and the crack do not occur in the runner chamber.

Abstract: Response surface methodology (RSM) was employed to optimize the extraction conditions of tannins from banana peels. Based on the single-factor experiments, four independent variables including ethanol concentration, solid to liquid ratio, extraction time and extraction temperature were selected as affecting factors. According to central composite design (CCD) the four factor, five levels experiments were carried out with the tannin extraction yield as evaluation index. The results show that the optimized conditions are as follows: ethanol concentration of 75.44%, solid to liquid ratio of 1:35.34, extraction time of 7.94 h, extraction temperature of 62.85°C. Under the optimized conditions, the predicted tannin extraction yield reaches 58.55%, while the actual extraction yield is 57.42% with the relative error of 1.13%.

Abstract: With the rapid development of our nation’s economic construction, bulk cement trucks have developed rapidly among the special vehicles. The entity model of the bulk cement body tank was created using 3D drawing software UG. The model’s accuracy was proved through calculation and on the basis of the entity model the strength of structure was analyzed by Finite Element Analysis software Nastran. Lightweight processing of steel material was made to reduce the overall quality of cement truck and the loading capacity was increased under the condition of meeting the design strength. The theory basis on the development research and optimization design of bulk cement truck tank has been provided.

Abstract: With the establishment of the appropriate porous media model of the combustor, temperature contour map on combustor cross section were simulated under the condition of different flow rate and different porosity in the Fluent software, and experimented to verify the simulation. The results show that: Flame core position moves toward the export with the increase of flow rate, but when the flow increases to a certain amount, the outlet temperature rises significantly. temperature distribution is the best when flow rate is 120 mL/min; With the decrease of the porosity, the flame core position moves to the entrance. Wall average temperature of the combustor is the highest when porosity is 0.4.

Abstract: The key of swirling airflow finishing is how to generate the swirling airflow. In the paper, three swirling airflow head are discussed according the manners of tangential inflow. By means of FLUENT, the general software of CFD, the swirling airflow field from different airflow head is simulated. The simulation results are shown by the flow line graphs, tangential velocity, radial distribution graphs, etc. All we have studied is as the basis for the determination of the application scope of each swirling airflow head.

Abstract: The dynamic response analysis of a transmission angle tower subjected to wind excitations is actively carried out in this study. The structural model is constructed based on finite element approach with the aiding of commercial package ANSYS. The equation of motion of the transmission tower-line system under wind excitations is established. The dynamic wind loading are applied on the tower-line system to examine the structural responses. The deformation and stresses distribution of the transmission angle tower are computed to explore the structural performance. The made observations indicate that the peak stresses of some members are large than the permitted yielding stresses of steel material.