Applied Mechanics and Materials Vols. 490-491

Abstract: For traditional rotary burrs, cutter teeth converge at the vertex, which means small chip space and poor cutting condition. In order to increase the chip space and to improve the cutting condition, a new type of rotary burrs with partition blade teeth, which took the feasibility of the actual process into consideration, was proposed. The curve planning algorithm planned the blade curves on the tooth bottom contour surface, and adjusted the tooth bottom contour model by some parameters, such as the small central angle and the position of oblique planes, to control the contour and blade shape for rotary burrs effectively. Experimental results demonstrate the effectiveness of the proposed algorithm.

Abstract: For and multi-core in integrated avionics system used in the challenge, will partition scheduling on a single core changed concurrently on multi-core scheduling problems, we will partition into two partitions exclusive partitions and perform part to solve scheduling resource sharing and synchronization issues. We partition as a unit, to establish a and multi-core partition scheduling model and proposed approximate minimum core and multi-core partition scheduling algorithm to ensure exclusive partitions can be scheduled in the case, you can create a mapping for and multi-core partition to partition scheduling on multi-core .

Abstract: The optimal disturbance rejection control problem is considered for a kind of consensus with control time-delay affected by external persistent disturbances and noise. An transformation method is used to convert the consensus with control time-delay to the consensus system without time-delay. The optimal estimated values of the converted consensus system states are obtained by recursive filtering with Kalman filter. Then the feedforward-feedback optimal control law is deduced by solving the Riccati equations and matrix equations. Lastly, simulations show the result is effectiveness to the consensus system with time-delay with respect to external persistent disturbances and noise.

Abstract: The simulation model of the double wishbone independent front suspension with a single degree of freedom is built based on the dynamics simulation software ADAMS/VIEW in this paper. Through the optimization and analysis of the upper cross arm (UCA) and the low cross arm (LCA), we can achieve the goal of decreasing the sideways displacement and the tire wear.

Abstract: This paper studies the temperature field variation of the chain link as well as the stress and deformation distribution of the pin which works in hot forging and stamping production line with heat recovery function. The approach is to build the model of the chain link with Pro/Engineer and apply it to the simulation with Pro/Mechanica. To be specific, it is to stimulate the thermal conduction of the chain link and the stress state of the pin under high temperature with Pro/Mechanica-Thermal and Pro/Mechanica-Structure module, respectively. The results are the temperature filed nephogram of the chain link as well as the stress and deformation nephogram of the pin. The simulation shows that:1) the temperature reaches 420°C at the contacts of the outer and inner plates at 600s, 2) the maximum stress of the pin is 112Mpa at the ends where the pin meets the outer and inner plates,3) the pins max deformation is 0.0159mm at the middle of the pin. Comparing the simulation to the actual temperature at the contacts of the outer and inner plates,which is measured ten times in advance with average of 439°C ,the simulation is favorable. According to the results above, graphite lubrication should be chosen for the chain and the pin can work properly with deformation rate of 0.795. By this way of simulating with Pro/Mechanica, complicated calculations and repeated tests can be reduced largely, meanwhile, useful parameters and mathematical model can also be provided for manufacturing and process control.

Abstract: In this paper, ANSYS-CFX computational fluid software was applied for the study of numerical simulation, to explore the influences of the vertical attached jet air flow on outside wall formed by the slot outlet to the indoor temperature field and velocity field. By analysis and study of the indoor velocity field under different supply air speeds distribution, the new type air conditioning air supply might be found, and the uncomfortable degree caused by vertical temperature differences and cold wall nonuniform radiation could be reduced. Thereby, the double-index of the energy conservation and comfortable in the office building could be matched for business building, hotel and other public buildings. The result of this study indicated that,in order to achieve the goal of saving energy and improving indoor thermal comfort, the appropriate supply air velocity should be determined according to the actual conditions in heat ventilation air conditioning application.

Abstract: The building envelope is known to be an important aspect of design and engineering of ultra-low energy buildings. The facade (building skin) could have the potential to redirect and filter daylight, influence frontal external wind intensity, provide natural ventilation, manage heat transfer, enhance occupant well-being, and create visual and physical connections between the inside and outside. The advances in facade technologies have been triggered in part by higher energy prices, stricter building codes, and higher occupant and owner expectations regarding the quality of the finished construction. This paper provides a comparative assessment of the effect of redesigning an existing building facade and other building improvements. It assesses the impact on external environmental conditions (wind speed and pressure) by employing computational fluid dynamics. The impact of these changes on occupant satisfaction was also gauged. It is hoped that this analysis will provide a framework for assessing benefits of improved facades in other buildings and applications

Abstract: In this paper, the numerical simulation was adopted to explore indoor air distribution affected by three typical heated source distribution models, included spatially homogeneous heated source in the room, the heated source distributed evenly at the bottom and the local heated source at the bottom of the room. The characteristics of air distribution effected by three typical heated source models were studied in the air conditioning room with the pattern of lateral supply and return, the scope of rational arrangement in relatively comfortable environment of indoor personnel occupied zone was obtained. The result indicated that, the air distribution with the setting of the spatially homogeneous heated source pattern and the heated source distributed evenly at the bottom pattern were more satisfying than the setting of the local heated source at the bottom pattern.

Abstract: A rigid-elastic coupling multi-body dynamic model of a car was established. The controllability and stability including constant cornering, steering returnability and steering effort performances are analyzed. Results show that there is still a feasibility to enhance the understeer. By optimizing the suspension parameters using DOE method, the characteristic of understeer was improved. Simulation analysis indicated that the characteristics of steering effort and steering returnability were not affected due to change of suspension parameters.

Abstract: This article is based on the real condition of a tunnel. By using displacement and stress contours get from finite element analysis software ANSYS, the simulation of the tunnel excavation is modeled and the regulation of overlying rock’s displacement and stress is deducted during the evacuation of the tunnel. The analysis result to overlying rock mass’ rupture regularity can be helpful for the control of surrounding rock’s stability and the improvement of supporting system. The result shows finite element analysis software ANASYS can be used to guide tunnel constructions during the evacuation.