| Popis: |
Розглянуто та проаналізовано сучасні моделі опису напружено-деформованого стану конструкції та процесів обертових теплових агрегатів. Створена нова модель, яка дає можливість реалізувати системний підхід до аналізу поведінки машин і зробити вибір раціональних параметрів їх роботи в різних експлуатаційних режимах. The contemporary models of the opa of stressed-deformed state of construction and processes of rotating heat aggregates are considered and analyzed. The new model is being tweaked, and so it is possible to realize the systemic pi-hod to the analysis of machine machinery and to modify the robotic parameters in the experimental mode. For modeling of the heat pump unit under the influence of uneven temperature fields and external forces, the ratio of the mechanics of a deformed solid body, namely, the equation of motion and energy conservation, is used. Simulation of a thermo-stressed state is carried out in two stages. First, the problem of thermal conductivity is solved by the iterative algorithm, since the system of equations is nonlinear. At the Department of СPSM KPI them. Igor Sikorsky developed an integrated system VESNA which was used to calculate the temperature fields and thermomechanical stresses in the thermal unit. To test the algorithms of calculation and mathematical model, the thermal unit of the wet process of cement production, which includes a rotary furnace of 4x150m with recuperator refrigerators, was investigated. The main load on the heat aggregate is the weight of all structural elements. The weight of the processed material is 1-2 % of the total weight of the rotary kiln and is not taken into account in calculations, as well as the longitudinal slope, which is 3-4 %. In calculations, it is taken into account that the furnace is a thermal unit, and when calculating the VAT it is necessary to take into account the effect of uneven temperature fields that cause the corresponding thermosensitive stresses. The mathematical model and algorithms of calculation for the study of the stress-strain state of a rotating heat aggregate are developed. The indicated developments allow for more precise calculations and allow us to determine the effect of mass forces and thermosetting loads in a complex formulation. It also provides for the possibility of arbitrary change in the geometry of structures and physical-mechanical properties of materials. Definition of the field of temperature and the total VAT of the thermal installation allow to simulate the work not only of the case, but also refractory lining, which makes it possible to determine the efficiency of the heat work of the unit. The obtained data allow to carry out technical diagnostics and non-destructive control of high-temperature thermal units and to make a choice of effective parameters of work and structures in general for different operating modes |
