Applied Mechanics and Materials Vols. 215-216

Abstract: In this paper, we presented a constrained multi-degree reduction algorithm of DP curves based on the transformation between the DP and Bézier curves. We first correct the conversion formula between Bernstein basis and DP basis. And then, we deal with multi-degree reduction of NP curves by degree reduction of Bézier curve.

Abstract: Considering the fact that the human visual system is not only highly adapted for extracting structural features such as lines, edges, contours from the input images, but also has characteristics of multi-channel (multi-scale) information processing, An image fusion assessment metric based on multi-scale structure similarity is proposed. Compared with the single-scale assessment metrics, the proposed metric provides more flexibility on account of considering the variations of viewing conditions and has better consistence with human perceptions. Visual experiments and quantitative analysis confirm its effectiveness, and the statistical results of image fusion demonstrate its promising applications.

Abstract: The roof side broken brings serious security risks in the construction in coal mine. The geological structure of faults and folds that encountered in coal mine and the affect of abutment pressure in the goaf creat roof side broken. If in the way of reinforced support to control the surrounding rock, it is difficult to achieve the expected security. Especially if the roof side broken appears in the mining gateway, controlling the surrounding rock by the way of reinforced support causes waste of materials and the supporting effect is limited. So, combined with the distribution of abutment pressure of the surrounding rock in broken roadway, starting from the nature change of the surrounding rock, through injection of Malisan to change the broken condition of surrounding rock, the broken roadway is effectively.under control.

Abstract: In this paper, a truss model is used for the geometrically nonlinear static analysis of a thin shallow arch subject to snap-through. Thanks to the very simple geometry of a truss, the equilibrium conditions can be easily written and the global stiffness matrix can be easily updated with respect to the deformed structure, within each step of the analysis. A very coarse discretization is applied. For the geometrically nonlinear static analysis, a short computer program has been developed by displacement control of a plane truss model of a structure. This very short, fully documented computer program is applied on the geometrically nonlinear static analysis of a specific thin shallow arch subject to snap-through.

Abstract: In this paper a structural Finite Element analysis of a 50 ft pleasure vessel is presented. The study is performed under different loads conditions: modal analyses have been done in order to find the natural frequencies of the vessel, structural analyses to verify the strength of the vessel to design loads. The design loads for the vessel considered are computed according to RINA rules for the construction and classification of pleasure vessels [1]. Two different composites are used for the lamination: one is a monolithic sequence of short fibre and balanced glass lamina, used for the bottom of the vessel and for structural reinforcements, the other is a sandwich made of glass fibre composite skins and a PVC core, used for the main deck and sides of the vessel. All the analyses are performed by using Patran/Nastran™ finite element commercial software in order to identify critical areas where possible reinforcement or redesign needs to be considered.

Abstract: In this paper, a model of an engine case is designed in Pro/Engineer for fatigue simulation. The meshing is created by the way of Abaqus. According to the working conditions, the boundary restriction of the simulation is defined. By the simulation, the heat distribution of the engine case is given, the causes of relatively high temperature areas are discussed, and the heat-stress distribution is drawn too. The high stress area in the engine case is discovered. The simulation result shows that the steady working stress is about 60MPa, the transient stress is between 90MPa to 120MPa, and the maximal stress is 136MPa. Based on the heat stress the fatigue life of the engine case is analyzed. The research result is a reference of the engine case safe working.

Abstract: According to the geometric significance of the reliability index, the solving of the reliability index is converted to the optimal solution of minimum without complicated functional derivation. The optimal model of solving reliability index is generated. The software MATLAB is used to establish the general calculation program of reliability index, which could facilitate the calculation of structure reliability index.

Abstract: Three-dimensional solid model and the finite element contact analysis model of the frame in ZJZ3250 self-dumping truck are created by using the ANSYS software, different constraints and loads are imposed in the conditions of bending, torsion and lifting, the stress distribution of the subframe is got. So the stress concentration positions are found, the strength of the subframe is checked, it is proved that the static strength of the subframe is in the allowable range in the three conditions, to meet the design requirements, and provide a theoretical reference for further design.

Abstract: Modal analysis was done to steel shaft and rubber shaft, and their top ten orders of nature frequency were obtained. The lowest nature frequency of steel shaft is 64HZ and the rubber steel’s is 2.2463HZ. Doppler vibration measurement was done to main shaft of paper advance mechanism and the time domain signal and frequency domain signal were obtained when the rotational speed is 80, 160, 240, 320, 400 Rpm. The frequency and amplitude were obtained by signal analysis. It proves that the nature frequency of steel main shaft is much higher than measuring result, but the seventh and eighth order nature frequency of rubber material is in accord with measuring result of laser doppler vibration.

Abstract: UG software was used to build the entity model for light truck driving axle housing, imported the model to ANSYS Workbench collaborative simulation software, and analyzed the stress after meshing and loading. It can be seen that the maximum equivalent stress of the drive axle housing under various conditions was less than the allowable stress value, and the evaluation index of vertical bending static strength experiment is K_n > 6, meeting the strength requirement; In the condition of full loads, the maximum deformation of the per-meter center distance is: 0.1 mm/m < 1.5 mm/m, also meeting the rigidity requirement; The experimental study is used to verify the analysis results referring the relative articles, shows that analysis results are reliable. This process provides reference for other driving axle housing and similar structure finite element analysis.