The thermal water-jet technology and mechanical milling method are comprehensively applied in the design of the new de-icing device. These two kinds of de-icing methods are combined as a set of multi-functional system, in which the thermal water jet cuts the ice layer into separated sections, and then the mechanical milling unit can easily remove the remaining sections. To obtain the affecting factors in the new de-icing device, repeated indoor experiments were conducted and the data was analyzed, which would provide some theoretical references to further optimize the design.
Determining how to quickly and economically remove the ice on the airport runways, city roads and bridges is becoming a tough problem to keep the traffic flow and safe in the snow and icy weather. In this context, this paper presents a new method that combines thermal deicing method, water-jet cutting technology with mechanical deicing method, based on analyzing the deficiencies of the existing ice removal methods. Then, it introduces the construction of thermal water-jet and mechanical deicing equipment, mainly the design of thermal water-jet device, and presents the experimental results by repeated indoor experiments. The results indicate that the device can perform well in deicing work, and satisfy to the design requirements.
Thermal water jet is an important part of the synthetically de-icing equipment designed to cut the frozen ice and snow on the public facilities. The inner structures of the jet nozzle, such as the conical and straight conical nozzles, have a crucial influence on the final efficiency of the cutting. In order to figure out the effect of these two kinds of nozzle structures to the jet fluid, and provide some strong references for the structure optimization, this paper synthetically uses ICEM CFD and ANSYS FLUENT software to analyze the fluid of the conical and straight conical jet nozzles. The results show that: as the initial conditions are determined, the conical nozzle has a higher speed and longer isokinetic core zone of the flux than that of the straight conical nozzle, and the speed changes more dramatically. However, the straight conical nozzle has a more stable speed, and lower operating vibrations. Through repeated indoor experiments, the simulation results are demonstrated.
Collision detection can effectively improve the authenticity, credibility and immersion of the virtual simulation environment. So this article mainly analyzed several classic collision detection algorithms, and put forward to use K-DOPS method in virtual maintenance system. Through EON simulation platform, the execution results of the algorithm were tested. The results show that the use of K-DOPS algorithm in collision detection can real-timely avoid collision and penetration between the part models in virtual maintenance training system for diesel engine, brilliantly enhancing the authenticity and immersion of the simulation environment.
Unmanned excavator has been developed for the improvement of operation efficiency and the decrease of economics cost, on which the researches have attracted widely research enthusiasms. Deterministic surfacing method is an effective technique for the intelligent control of the unmanned excavator, and the key point is modeling of operation function. Through analysis of operation process, kinematic trajectory of the relieving tool is obtained. By simplifying structures and parameters of the operation system, both cross-sectional line and 3D feature which represent character of the operation function are obtained. Modeling of the operation function will promote application of the unmanned excavator and supply experience for advanced control of other unmanned construction machines.
As one of the 3D modeling key technology, polygon transform have some operation and manipulation methods which can be applied neatly and confirmed by the characteristic of practical model. Polygon transform methods such as inserting vertex, inserting polygon, extrusion, transition join, triangulation and iterative triangulation algorithm and so on are discussed by using practical examples of reverse modeling in this paper. The experiment results show that using these methods synthetically have an effect on constructing and transforming complicated 3D model. We can thin polygons, redefine new local models, extrude polygon outwards or inwards and largen or reduce selective polygon borderline, form a new rolling polygon which joins on the original model, and subsection polygon into triangles by defining new borders inside the polygon.
In winter, it is very important to get rid of the ice and accumulated snow which are covered in the road so that it can reduce a series of badly accident. Therefore, a variety of road deicing methods are listed in this paper. The advantages and disadvantages of road deicing methods are analyzed. The article enumerates some inductions to several road deicing devices which are used in the cold areas of our country. The paper gives some reference for road deicing devices research.
Using NURBS modeling method can construct more realistic and vivid 3D models, because it has a remarkable ability to control the curves of the model surface than the traditional grid modeling method. Therefore, on analysis of the primary principles of NURBS, this paper adopted professional modeling software 3DS MAX to explore the methods and techniques of NURBS in the complex surface building process. And then, the techniques and methods were applied to construct practical engineering machinery, completing the 3D model of bulldozer case.
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