Advanced Materials Research Vols. 455-456

Abstract: . Analysis is made to the operating task in ocean, making the series devices of marine intelligent machine the primary study content and having the deep research on its key techniques. At the same time, the corresponding prototype was produced and then tested. It proved to be that the research is feasible and the production is successful. It makes contributions towards the domestic submarine operating technology.

Abstract: . Tire blow-out (TBO) is very likely to trigger dangerous accidents particularly when the car operates at high speed. Usually, TBO at one of the wheels results vehicle’s yawing movement, forcing driver in panic to turn the steering-wheel abruptly as he or she does with the normal operation. Unfortunately, this tends to improperly steer the vehicle in imbalance due to serious variation of steering characteristics after TBO and causes it rollover or spinout as a consequence. Basically, this paper addresses the blown tire model (BTM) based on the UniTire model we developed and applied in CarSim to perform some simulations to study the vehicle’s kinetic behavior after TBO. Finally, the Vehicle’s steady-state steering characteristic after TBO is presented.

Abstract: Taking example for U-shape sheet metal, the paper studies the forming and springback process with Dynaform, how much the springback influenced by several factors is studied, including die figure, stamping velocity, the stroke, the blank holder force and friction. Then a useful conclusion can be reached: Using die figure to optimize the technological parameters remarkably reduce the springback value, it provides a new method to control and solve the springback issue.

Abstract: Aiming at the issue of steel belt of the box punching CAM, an optimal layout algorithm is presented to automatically select process parameters. Based on improved simulated annealing algorithm, polygon detecting method is used to achieve auto-shunning shear corners of the steel belt of the box. The application of the software developed based on the algorithm is of the fast convergence and effective punching teeth layout.

Abstract: It is difficult to gain the ideal effect by using a single control method for shifting process due to many influence factors of synchromesh shifting process in Automated Manual Transmission (AMT). Synchromesh shifting process is divided into two stages. One is stage of eliminating the gap of synchronizer, and the other is the slipping stage of synchromesh. The paper mainly analyses the control process of eliminating the gap of synchronizer. By adopting the adaptive control to reduce the shock of initial shifting stage, it can reduce impact and abrasion wear, and improve the quality of whole shifting process.

Abstract: The paper consider heat and moisture transport within cotton fabric exposed to fire as drying process. A mathematical model of simultaneous heat and moisture transfer is proposed for the prediction of temperature distributions during high heat flux condition based on the theory of drying. Shrinkage occurring in the drying zone was incorporated into the present numerical model. Using the model, we will can understand the drying mechanism and process of flame retardant cotton fabric used for thermal protective clothing. The discrete calculation and experiments will be presented in the further study.

Abstract: In this paper, a two-dimensional hot model of melter gasifier, in which paraffin and corn are used to simulate DRI, coke and lump coal respectively, has been established to study the regional boundary in this paper. While the whole experimental process is recorded by the high-speed camera, the image processing method is put forward to define each regional boundary. By means of this method, the boundary of raceway, cohesive zone can be obtained quantificationally.

Abstract: With the microelectronic technology node moves down to 45 nm and beyond, and to reduce the RC delay time, low-k dielectric materials have been used to replace regular dielectric materials. Therefore, the down force of chemical mechanical planarization (CMP) needs to decrease based on the characteristics of low-k materials: low mechanical strength. In this study, the effect of new complex agent on copper dissolution in alkaline slurry for CMP was investigated. Based on the reaction mechanism analysis of Cu in alkaline slurry in CMP, the performance of Cu removal rate and surface roughness condition were discussed. It has been confirmed that Cu1 slurry demonstrates a relatively high removal rate with low down force. And also, by utilizing the Cu1 slurry, good result of Cu surface roughness were obtained.

Abstract: With low-k dielectric materials taking the place of oxide dielectrics as the primary dielectric materials, the low-k dielectric materials and interconnection Cu metals during Chemical Mechanical Planarization (CMP) is becoming a critical surface quality issue as well. In this study, experiments are carefully designed and conducted to investigate the effects of colloidal silica under compared acidic slurry and self-prepared alkaline slurry on k value of low-k dielectric materials, and in both of the slurry, colloidal silica (20~30nm) was used as polishing abrasive. The results showed that k value of low-k dielectric materials both increased within a similar range (self-prepared alkaline slurry, 3.27~3.33; commercial acidic slurry, 3.26~3.32), however, the results showed a obviously different result from reference’s report.

Abstract: The investigation was to study the effect of laminar-turbulent transition on predicting thermal load of vane. The Abu-Ghannam and Shaw (AGS) algebraic transition model was applied in the coupled solver, HIT3D. Then the solver was employed to carry out coupled heat transfer simulations, and the test case was 5411 run of NASA0-MARKⅡ vane, a high-pressure turbine vane. The results shown that AGS model was able to predict the transition process in the boundary layer near the vane, and that the simulation with such model leads to thermal load agreeing well the measured one. Then the developed solver was applied to predict a low-pressure vane, and the results shown that CHT simulation with full turbulence model would predict higher thermal load than that with transition model.