Papers by Keyword: Computer Model

Abstract: The results of computer simulation processing and determination of limiting degree of deformation by the Kolmogorov criterion are presented. The derivation of the dependence for the evaluation of the destruction of low-plastic materials at the edge is made at bend angle of 90⁰

Abstract: The cutting process was presented as a real object as well as its physical and mathematical modelling. For the description of the non-linear phenomena, at the typical increment ratio, the updated Lagrange's description was used. Adequate deformation and stress increments measurements were used, e.g. Green-Lagrange's deformation tensor increment and the increment of the Piola-Kirchhoff's second symmetrical tensor. Nonlinearity of the material was described by means of the increment model taking into consideration the deformation and deformation rate records. The workpiece is treated as a body in which there may be elastic deformation (in the range of reversible deformation) and visco and plastic (in terms of irreversible deformation), with nonlinear hardening. For the construction of the material model Huber-Mises-Hencky's non-linear plasticity condition was used, associated principle of flow as well as mixed hardening (isotopic-kinematic). The condition of the material after pre-machining processes was also taken into account by means of implementation of initial conditions of: displacement, strain and stress. Yield stress of the body was described by a Cowper-Symonds' model allows for linear-isotropic, kinematic or mixed plastic strain hardening and the effect of the intensity of plastic strain velocity. The applications in ANSYS program and results of numerical calculations were presented. A method of generating a three-dimensional abrasive grain with a geometry close to actual were describes. The influence of the process parameters on the states of strains and stresses and on the quality of the product was presented. Numerical calculations of cutting process with single abrasive grain were made and investigated the deformation and stress occurring in the workpiece. The experimental test stand of single abrasive grain cutting process, the test plan and the verifications of results of numerical simulations were describes. The results were statistically developed and that’s give the models in the regression function form.

Abstract: In today's competitive world the main direction of improvement of any production is the modernization of known technological processes and creation of new ones. A huge role in improving the process of manufacturing parts is played by computer and innovative technologies that allow to adjust technology to create the best quality castings at the lowest cost. All of this ultimately leads to saving materials, energy, labor time, protects equipment, and in return we get a lot of unique information about the process.

Abstract: The computer model of emergency shutdown (ESD) system of Tokamak has been developed. Xcos extension of the package Scilab of linux operating system was used for developing the model. The simulated system monitors the most ultimate in terms of the integrity of the preproduction equipment and personnel safety parameters and provides an opportunity to prevent accidents. In the accidents occur the system executes algorithms of protective effects providing the complex transfer to a safe state, which allows to reduce consequences of possible accidents.

Abstract: A transient mathematical model of the submerged arc welding process with the hydrostatic statement description of its basic physical phenomena has been presented. Radiative heat transfer from the arc column to the surface of the cavity arc is adopted. The heat current flowing from the electrode layer of molten flux on the arc column to the arc cavity surface is taken into account. The energy balance is considered. A comparison between the calculated and experimental data has shown their good correspondence.

Abstract: Pavements have been damaging during the service life so knowing their current state is valuable and offers important information to choose the right technique to repair the damage caused by vehicles traveling on it. Different kind of diagnostic methods are used for that reason. Many new modern gadgets, which can measure very fast changes of the displacement, have been developed for the last years. Consequently the new modern dynamic diagnostic methods are widely put into service. One of them is FWD Dynatest, which measures displacements on the surface of the pavement while it is loaded by force impulse.

Abstract: Floors which are used for factory building are usually located in an environment where is expected to be used heavy vehicles and also heavy supplies stored on the floor. What means that these structures have to be designed to withstand the action of the forces. For that reason it is useful to do a numerical simulation followed by stress analysis and evaluation of results. The parametric study was done to compare the influence of different thickness and different characteristics of the subgrade on the values of stress in a concrete slab. It was loaded by forklifts and structures used for storage of material and products.

Abstract: Under the background of information age, the computer plays a dominant role, and especially the emergence of the network makes the parallel computing possible. It makes the computer do a lot of image information processing in a short period of time, so as to obtain the best effect of art image design. Based on this principle, we design the model and algorithm of art image design through computer. We use normal bump of texture image processing technology, transforming two-dimensional image to 3D display, so as to achieve a good effect of art show. Finally, based on the construction of city public environmental art and city image, using the public environmental logo design as an example, we study the three-dimensional effect in identification system, so as to get a good image of the city, and provide a theoretical reference for the study of city public art and the image of the city.

Abstract: This paper investigates a bus waiting problem quantitatively by building a mathematical model. The problem is when a passenger is between two stations, which station to choose is favorable for him to catch a bus Here, several related factors are discussed to explore their influences on the bus-waiting problem, including the original bus position, the average velocity of bus, the length between two bus stations, passenger’s position and his velocity. Finally, some important conclusions are drawn.

Abstract: New technology of reinforcement materials in asphalt overlays can offer a potentially cost effective solution for treating cracked pavements. To date, however, there is no design process allowing the use of available reinforcement products in road applications in Australia; whereas overseas design procedures are not readily available. A new 3D finite element (FE) analysis procedure was considered where reinforced asphalt layer is modelled as a thin 3D compound non-homogeneous layer which is then converted into a 3D orthotropic membrane. This procedure was used to analyse performance of three reinforcing products for road applications in Australia and results indicated that it is possible to predict and compare “retard reflection cracking” performance of various reinforced products.