Advanced Materials Research Vols. 765-767

Abstract: The offset surface for Catmull-Clark subdivision surface is accomplished in this paper. Currently, the offset methods main two ways, one is directly offset method and the other is inverse iteration offset method. Firstly, this paper summarizes the offset principle for the two offset methods. Secondly, define Catmull-Clark subdivision surface as the research target, the offset surface is obtained by used two offset methods. Lastly, as a case study for molar restorations, the offset error is discussed for two offset methods.

Abstract: In the process of designing aeronautic composite mold parts, previous designing knowledge and expertise cant be well used, the cycle of parts modeling is long and its production efficiency is low. According to the classification and characteristics of aeronautic mold parts and the knowledge engineering technology, based on the fusion module in UG6.0, we establish its repository by the knowledge acquisition, knowledge representation and knowledge reasoning of aeronautic mold parts. With the UG secondary development tools, UG/Open Menuscript and UG/Open Uistyler, we develop user menu and parametric design interface of aeronautic mold parts, make good use of its designing knowledge, and fulfill the knowledge-driven parts parametric design. They satisfy the rapid design requires of aeronautic mold parts and shorten its designing cycle.

Abstract: Vehicle dynamic model is composed of several subsystems. Once problems appearing during model debugging, it is difficult to know which subsystem they belong to. Therefore, it is important to validate each subsystem model before building the whole vehicle model. More complex subsystem model should be built to meet the need of higher accuracy of vehicle model, so whether the subsystem models achieve their design goals also needs to be confirmed. To deal with the problems above, it is needed to build the virtual test desk to validate subsystem model separately. This paper develops a virtual test desk for the wheel model, which has big influence on the vehicle model. A dynamic wheel model of a B-class car is built, and then, it is validated by the virtual test desk. The results of the test not only illustrate the correctness of the wheel model, but also demonstrate that the test method can validate the subsystem model effectively before building the vehicle dynamic model.

Abstract: Hydraulic Confined Piston Engine (HCPE) is a new type of internal combustion engine which can directly convert thermal energy into hydraulic energy. Power system of the six-cylinder HCPE is studied in this paper. The power system model is built; the power system analysis and design are carried through. The new type of crank connecting rod mechanism is proposed in the six-cylinder HCPE. Fitting-curves of movement, force, and torque for the key parts are drawn to provide theoretical support for the prototype of the six-cylinder HCPE.

Abstract: In this research, our research team used the self-designed piezoelectric actuator to achieve the micro/nanometer level precise positioning biaxial piezoelectric actuated stage through the redesign of stage mechanism. A novel piezoelectric actuator structure - 4-9-9-14 piezoelectric actuator is constructed, and it is made of piezoelectric buzzer to drive the stage. The movement of the piezoelectric actuated stage is read and analyzed by means of NI PCI-6115 data acquisition card and LabVIEW software operating in conjunction with a linear encoder. The new consideration of tuning time T_on is used to place of traditional method of changing the magnitude of driving voltage to control the stepping distance of the stage. Under a constant driving voltage, the displacement of the stage increases with time T_on, and the displacement of the stage decreases with time T_on. The aforesaid phenomenon occurs to leftward or rightward movement of the upper stage and forward or backward movement of the lower stage. Given a constant time T_on, the displacement of the stage in motion decreases with the driving voltage, and the displacement of the stage in motion increases with the driving voltage.

Abstract: In this paper, the lubrication of three-dimensional EHL point contact with surface defect was solved, the lubrication film shape and film pressure distribution were presented and the characteristics of EHL point contact with defect were analyzed, the effect of surface defect on EHL point contact was studied. The results were presented that convex defect could lead to film pressure peak increasing, there was obvious micro-EHL effect, concave defect could lead to film pressure hollow and peak, film pressure peak was also increasing. The results also shown that convex and concave defects would have negative impact on EHL lubrication, there was great influence of surface defect on EHL lubrication pressure, the significant fluctuation of local film pressure was caused by surface defect, and generating greater pressure peak, maximum film pressure was rapid growth with the defect size increasing, so any kind defect should be to avoid in EHL lubrication.

Abstract: According to the difficulties of current China's automobile modeling design,a kind of automobile modeling design method based on rapid prototyping technology was put forward.The method has characteristics that are fast modeling,low cost and easy to modify.The main difference from the current automobile modeling design method is to make use of color pictures to establish the bodys three-dimensional CAD model directly and with the use of rapid prototyping technology to make entity model of the body.

Abstract: When the spray painting robot is in service, the synchronous pulley falls off and the robot touches the ground. Through analyzing the stress condition of the travelling system with the statics method, the paper points out the cause is that the mounting surface of the synchronous pulley is deformed due to system weight. The fault can be avoided by changing the transmission level of the original drive system and increasing the bearing support capacity so that the system weight can directly act on the rack.

Abstract: The first order vertical bending mode of vehicle and its stiffness are very important to the dynamic characteristics. A high-speed vehicle body was selected to study on, the differences of the sections stiffness features were considered, with the unknown sections geometry sizes, mass and mass distribution. Under the different load, the first order bending stiffness of the seven sections and the equal bending stiffness of the vehicle body was calculated only using the modal test data. The result was validated by the tested mode frequency. The research showed that the sections upon air-spring have lower stiffness, and the rice loading on the vehicle body would reduce the vehicle body bending stiffness. However, the middle section stiffness would increase with fixed number of passengers on the vehicle.

Abstract: The paper is in the context of a plate milling system in Baosteel. Extracting the rolling data of plate, and according to the different order of plates out-stove, by determining the contiguous plates out-stove time interval and calculating the rolling time, we could judge the arrangement plan of manufacture plan in a roll changing period to achieve optimize mill pacing. On this basis, the paper puts forward a calculation method of the contiguous plates out-stove time, and proposes a series of suggestions to optimize the manufacture plan. It provides helpful practical experience to the mill pacing research.