Identification of Dynamic Model of Safety Valve
DOI:
https://doi.org/10.22213/2413-1172-2018-4-13-21Keywords:
safety valve, gas-dynamic force, parametric identification, dynamic model, numerical methodsAbstract
A safety valve is among the devices being used to ensure the safety of pipelines and integrity of installations. To analyze stability of valves operation and to calculate oscillatory processes, the dynamic model is required, the parametric identification of which has been accomplished with the use of experimental data and multidimensional numerical simulation results. The task of valve dynamic model identification comprises determination of gas-dynamic force dependence on motion of the plate and performance characteristics (pressure, temperature) of the vessel in which pressure is being regulated. The task of safety valve dynamic model identification was formulated. The gas-dynamic force dependence on time and rise of the plate is found as the control function in the task of optimum control by two criteria: minimum deviation of calculated values from the experimental ones for pressure and plate displacement. The numerical method of optimum control is based upon reduction to the task of non-linear programming. To solve the set task of poly-criterial optimization, the hybrid genetic algorithm with material coding is used. The task of safety valve dynamic model identification is solved by means of three options of experimentation with 2J3 valve. Comparison of the calculated force difference from the measured one showed the opportunity to determine the gas-dynamic force value by the results of pressure measurement and plate rise at all the stages of the valve operation.References
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