Applied Mechanics and Materials Vols. 121-126

Abstract: Roll casting of the model alloy of recycled AA5182 aluminum alloy was investigated. Fe up to 0.6% was added to the AA5182 to make the model alloys of recycled AA5182. Increase of 0.6% of Fe means that the recycle was three times operated. A vertical type high speed twin roll caster was used. Some devices were operated on the twin roll caster to increase the cooling rate in order to make impurity fine. The roll speed could be increased up to 80m/min. The roll-castability did not become worse by the addition of the Fe. The LDR (limiting Drawing Ratio) was 1.9 when the Fe addition was 0.6. The deterioration of the mechanical properties by the addition of impurity Fe was very small.

Abstract: The functions and structure of a virtual operation training system for tower cranes was described, and virtual scene modeling techniques of the system was investigated in this paper. The virtual scene model of building site and environment around a tower crane were set up based on Creator softward. Model optimization techniques were used to reduce the number of model surfaces and model nodes, which saved system resources and improved system running speed. Model driver was realized in VC++ by calling Vega functions, which achieved the performance of real-time interaction between trainers and the scene. The techniques provide the foundation for developing the virtual real software of virtual operating system for training operators.

Abstract: In many data mining domains, labeled data is very expensive to generate, how to make the best use of labeled data to guide the process of unlabeled clustering is the core problem of semi-supervised clustering. Most of semi-supervised clustering algorithms require a certain amount of labeled data and need set the values of some parameters, different values maybe have different results. In view of this, a new algorithm, called semi-supervised clustering algorithm based on small size of labeled data, is presented, which can use the small size of labeled data to expand labeled dataset by labeling their k-nearest neighbors and only one parameter. We demonstrate our clustering algorithm with three UCI datasets, compared with SSDBSCAN[4] and KNN, the experimental results confirm that accuracy of our clustering algorithm is close to that of KNN classification algorithm.

Abstract: Open space is an important part of Campus, also has an important influence to the thermal environment of campus. The measurement of summer outdoor thermal environment of campus open space showed that: the piloti can effectively improve the thermal environment in hot summer; underlying surface materials, sky view factor has a great influence on the outdoor thermal environment. Using appropriate surface structure, increasing piloti and increasing square shading are suggested as outdoor thermal environment optimizing measures based the measure results. Advices were given for hot environment design and passive energy saving design

Abstract: In this paper, the basic concept and specific steps of establishing skew bevel gears mathematical model using conjugate meshing principle was introduced. Numerical value counting function of MATLAB was used to collect coordinate of tooth surface grid point, and under the Pro/E environment, data document of coordinate created by MATLAB was imported to establish tooth surface modeling , relying on the powerful function of complicated curve modelling, 3D solid modelling of gear was completed. The results via motion analysis kinematics analysis and interference inspecting under assembling condition show the accuracy of the design ,which supports further design, analysis and manufacture.

Abstract: In order to understand the performance of vegetable seedling transplanting mechanism, the movement of vegetable seedlings passing through seedling system was simulated based on Pro/E and ADMAS software. The equation of displacement and velocity of vegetable seedling were deduced. A nutrient soil bowl model of vegetable seedlings and a real size model were developed. We designed the parameters of vegetable seeding transplanting mechanism by theoretic analysis and optimum parameter. The validity of the parameters was demonstrated by simulation on the transplanting mechanism. The research can provide valuable theoretical principle for the parametric design, optima design and experiment of the vegetable seedling transplanting in the future.

Abstract: The aircraft ground deicing process and practical deicing model of aircraft on ground were introduced, a mathematic model was developed based on thermal and mass balance. In addition, a reference case was chosen to verify the mathematical model and four different spray parameters of deicing fluids were studied. And the simulation results indicated that the proposed model was effective to analyze and research the aircraft on the ground deicing process.

Abstract: The equipment combat unit is usually in the aggregated state when operate mission, and the mission maintainability is an important factor for its operational effectiveness. There were kinds of parameter to measure the mission maintainability, such as Mean Downtime and Mission Time to Restore Function. Based on the analyses to layers and performance of the aggregated equipment combat units, the signification of aggregated equipment combat units’ Mission Time to Restore Function was adopted and analyzed, the simulation method and simulation flow for the mobile mission of aggregated equipment combat units were given, and then the simulation model under ExSpect was constructed. Finally, an example was used to prove the simulation model.

Abstract: In order to solve the thermal deformation of the hydrostatic center frame in the heavy type horizontal lathe, a simulation research concerning temperature field of hydrostatic center frame is described. The Finite Volume Method of CFX has been used to compute three-dimensional temperature field of gap fluid between workpiece and bearing pillow. This research theoretically analyzes the influence of angular velocity on the bearing temperature performance according to lubricating theory and computational fluid dynamics, and it has revealed its temperature distribution law of gap oil film. Results indicate that an improved characteristic will be affected by angular velocity easily, and oil cavity temperature increases by gradually with angular velocity enhancing. Through this method, the safety of a hydrostatic center frame can be forecasted, and the optimal design of such products can be achieved, so it can provide reasonable data for design, lubrication, experience and thermal deformation computation for hydrostatic center frame in the heavy type horizontal lathe.

Abstract: In practical sonar engineering, the random phase disturbance error will be existed in the output signals of every channels of hydrophone because of the complexity of ocean diffuse environment and the disturbed beam. So only the statistical methods can be used to analyze these errors. By this way, the influence of the different output signals of every channels of hydrophone on MVDR Beam former and the array gain is researched, and also the computer simulation is completed.