Papers by Keyword: Temperature Field

Abstract: The constitutive relationship of GH4169 superalloy was investigated. The grinding thermal load acting on GH4169 workpiece in grinding process with conventional aluminum oxide wheel was determined by using the method combining finite element method (FEM) with experiment. The grinding temperature field and grinding thermal residual stress generated in GH4169 were calculated via finite element method (FEM). Finally, the relation between grinding parameters and grinding temperature field and that between grinding parameters and thermal residual stress were discussed.

Abstract: Temperature test was very important for product development and quality control of cigarette industry. However, gas temperature test inside cigarette was very difficult and time-consuming due to small volume of cigarette and lack of proper fixing device of temperature probe. In present paper, a fixing device for temperature test of cigarette was designed and developed. Thermal couple was well fixed by present device and can be inserted into the cigarette conveniently and quickly. Precision of location and depth of insertion was 0.002mm. Repeatability of parallel experiment was ensured. Test efficiency of temperature field was improved. Automaticity of temperature test was enhanced. With the increasing demand on gas temperature test inside cigarette, present fixing device will have good commercial prospect in market place.

Abstract: Based on the experimental measured cooling curves and the boiling heat transfer theory, the inverse problem of nonlinear heat conduct equation for Steel 1045 quenched by different hardening media was established by functional analysis and finite element method, and the surface heat-transfer coefficients in continuous cooling during quenching were calculated by nonlinear estimate method. Then the constitutive model of Steel 1045 during quenching was established subsequently. Finally, the temperature field of Steel 1045 cylinder quenched by different hardening media was simulated by Finite Element Methods (FEM). Results show that the calculated temperature fields agree with the practical quenching process.

Abstract: Bobbin tool friction stir welding is a new type of friction stir welding. In the study, the thermo-mechanical model of the bobbin tool friction stir welding was set up. By this model, the temperature field of AA 2014 aluminium alloy work plate of 6mm was simulated, which provides useful information for the investigation of this new process. Simulation results show that the temperature field of the cross section presents symmetry approximately about the mid thickness of the work plate. The high temperature zone has large radius at bottom and top surfaces near the shoulders while small radius at the mid thickness, like a waist. The max temperature for the point at retreating side is about 40°C higher than advancing side.

Abstract: In order to analyze the influence rule of water pipe cooling on the temperature field and thermal stress of large aqueduct structure, the finite element analysis model for FuYang River Aqueduct structure was established. The temperature field and thermal stress of the aqueduct structure were calculated. The following two cases were considered: structure with or without water pipe cooling, as well as the different beginning pouring months (May, June and July). The hydration-degree-based calculation methods of temperature and stress of concrete were adopted, and the high precision discrete simulation method of water pipe was used. The calculation results show that embedding the cooling pipe in concrete can effectively reduce the temperature difference between inside and outside of the early concrete and thermal stress, and is therefore effective to prevent concrete cracks. High accuracy of simulation and analysis can make people basically figure out the specific mechanism of concrete cracking and main factors even before construction, and determine accurately the structure crack location and the developing tendency.

Abstract: In order to study the characteristics of the temperature field of the heating system in a washer-dryer, a numerical model to compute airflow field and temperature field is established according to the theory of fluid-solid coupled heat transfer. Simulation is realized based on the finite element method and verified with tests. The simulation results are in good consistency with the test result on the three aspects of temperature distributions, ranges and fluctuation tendencies. The errors of the lowest, highest and average temperature are all within 5.38%. Influencing factors leading to the offset of the high-temperature region in the downstream heating channel can be found from the valid simulation and they can provide theoretical basis for further optimization. The simulation results show that the configuration of the part of channel between the volute tongue and the heater leads to the transverse offset, and the triangular hump leads to the longitudinal offset.

Abstract: As a kind of infrared imaging equipment, thermal infrared imager plays an important role not only for military use, but also for civil. However, data of temperature filed cannot be obtained from thermal image directly. Accordingly, digital image processing technology and BP neural network were employed to analysis thermal image. Data of the whole temperature field were restored from the thermal image for further processing.

Abstract: Thermal deformation of high-speed motorized spindle has an important effect on improving the machining accuracy. In this paper the thermal boundary conditions of thermal deformation, including the heat generation of the motor and bearing and heat transfer coefficient, are calculated to simulate the steady-state temperature field distribution, transient thermal analysis and thermal deformation in ANSYS Workbench. They provide theoretically the data for the thermal error compensation of the spindle system.

Abstract: The long-stored missile as a result of environment temperature stress functions and so on, it will cause the missile material aging. For high-speed flight's missile, thermal coefficient of expansion between the different structural and element will be different simultaneously, when the aerodynamic heating will produce, the grain and the thermal insulation layer will also be appeared the crack phenomenon in the influence of expand with heat and contract with cold rules. For the example of some infra-red missile, aero-thermodynamic effect of the missile is carried on the forecast using the ANSYS software simulation, it has the important meaning to analyze the storage performance and failure mechanism of flying missile and so on.

Abstract: After the description of finite element model of three-dimensional heat conduction, the software FLOEFD is used to simulate a components temperature fields under various heat sources, to get the temperature difference curves and to analysis the difference between them. It comes out that when the power of heat source changes as a triangular curve, corresponding temperature difference is lower than that of sinusoidal power curve, but larger than that of constant power; Change rate of temperature difference of triangular power curve is lower than that of sinusoidal and constant power, but larger than that of square power curve. The distinction of temperature difference is caused by the different change-rate of inputting heat; the distinction of changing rate of temperature difference is caused by the different changing rate of heat source power.