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Multilevel Optimization of the Semi-Open Impeller in a Centrifugal Pump
(Wydawnictwo Politechniki Łódzkiej ; Katedra Dynamiki Maszyn - Wydział Mechaniczny Politechniki Łódzkiej, 2011) Papierski, Adam; Błaszczyk, Andrzej
Full optimization task for the case of the semi-open impeller with straight blades, requires description of its' geometry by means of, at least, eighteen design variables. In the case of constant meridional cross-section, are required at least eight design variables. Solution of the task with such great vector of design variables requires much more time. One way to manage to obtain a solutions with great variety of design variables is comprehensive approach to the task depending on the partition into minor subtasks. After decomposing the optimization task, one should choose procedure of solving it. One of these procedures is parametric optimization, which is two-stage method of minimizing (maximizing). This optimization is carried on in two levels. On a lower level, multi-optimization of decomposed parts of the tasks, depending on design variables, is being held. The solution of the lower level is used in an upper level (coordinating level) to find optimal coordination variables. It has been shown that result of multilevel optimization and full task optimization is the same in limits of accepted accuracy of the objective functions' calculus. Time of the calculation for the multilevel optimization task is over four times shorter than undecomposed task time.
Multiobjective optimization of the semi-open impeller in a centrifugal pump by a multilevel method.
(Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2011) Papierski, Adam; Błaszczyk, Andrzej
The complete optimization task for the case of the semi-open impeller with straight blades requires description of its geometry by means of, at least, eighteen design variables. In the case of constant meridional cross-section, required are at least eight design variables. Solution of the task with such a great vector of design variables requires much more time. One of the ways to obtain solutions with great variety of design variables is a comprehensive approach to the task including on the partition into minor subtasks. After decomposing the optimization task, one should choose a procedure for solving it. One of such procedures is parametric optimization, which is a two-stage minimization (maximization) method. This optimization is carried out in two levels. On the lower level, the multi-optimization of the decomposed parts of the tasks, depending on design variables, is being held. The solution of the lower level is used in the upper level (coordinating level) to find optimal coordination variables. It has been shown that the result of multi-level optimization and the whole task optimization is the same in limits of accepted accuracy of calculation of the objective functions. Time of the calculation for the multilevel optimization task is over four times shorter than the time of the undecomposed task.
New Design Method for the Formed Suction Intake in Axial-Flow Pumps with a Vertical Axis.
(Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2016) Błaszczyk, Andrzej; Papierski, Adam; Susik, Mariusz
A concept of the formed suction intake design obtained with an algorithm for vertical axial-flow pumps is presented. The design methodology is a part of works conducted within project no. N N513 460240 supported by the Polish National Science Center. The proposed procedure is used to optimize intakes. The results of steady flow numerical computations in the suction intake as well as applications of the design optimization in the aspect of fulfilling two objective functions are discussed. The objective functions given by the authors concern the optimal in flow of the fluid into the impeller.
Pompy spełniające specjalne wymagania ruchowe
(Wydawnictwa Politechniki Łódzkiej, 2011) Błaszczyk, Andrzej
Problem dostosowania pomp do warunków eksploatacyjnych oraz problem ich sprawności ma szczególne znaczenie ze względu na szerokie i ró norodne zastosowanie tego typu maszyn, a w rezultacie du e zaanga owanie energii wykorzystywanej do ich nap du. Tematem monografii s pompy spełniaj ce specjalne wymagania ruchowe, czyli pompy przeznaczone do współpracy z instalacj (układem pompowym) o zmiennej charakterystyce oporu hydraulicznego przy tej samej charakterystyce przepływu pompy.
Rozwój zrównoważony - zarządzanie innowacjami ekologicznymi : praca zbiorowa
(Wydawnictwo Media Press, 2009) Matejun, Marek (red.); Grądzki, Ryszard (1949- ) (red.); Lachiewicz, Stefan; Jóźwik, Krzysztof; Krysiński, Jan; Anuszczyk, Jan; Błaszczyk, Andrzej; Kryłłowicz, Władysław
Rozwój zrównoważony : uwarunkowania organizacyjne i techniczne
(Wydawnictwo Media Press, 2008) Grądzki, Ryszard; Błaszczyk, Andrzej; Lachiewicz, Stefan; Kryłłowicz, Władysław; Chodkiewicz, Ryszard; Sobczak, Krzysztof; Papierski, Adam; Karczewski, Maciej
The Vibroacoustic Analysis of The Hydrocarbon Processing Plant Piping System Operating at Elevated Temperature.
(Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2016) Błaszczyk, Andrzej; Papierski, Adam; Rydlewicz, Maciej; Susik, Mariusz
In this paper it is presented the vibroacoustic analysis of the selected section of the hydrocarbon processing chemical plant piping system operating at elevated temperature and subjected to dynamic load exciting vibration of the structure. The pump suction and discharge piping system is a part of chemical plant for processing hydrocarbon mixture at 270° C. Elevated temperature is one of static loads that influences the boundary conditions of the piping structure thus generating pump nozzle loadings leading to possible pump body deflection. Deflected shape of the pump body results in generation of flow fluctuation, visible and measurable as a pressure pulsation. This kind of fluctutation has been assumed further to be one of the dynamic loading on piping system structure. The dynamic analysis was performed to quantify the loading effect of pressure pulsation excited in the pump discharge nozzles on the structure of pipelines and the connected pump nozzles. The simulation was based on the numerical analysis of the excitation by acoustic waves propagation in subjected piping system. Measured on–site pressure pulsation at pumps nozzles has been identified and assumed to be the source of the acoustic waves. In the simulation elastic features of the piping structure as well as the fluid, and pressure loses in pipes, taken into account. Final result of the acoustic part of the simulation was spectral characteristics of the acoustic shock forces, defined further as harmonic loads for the dynamic structural analysis. To observe an influence of the acoustic excitation on the piping there was performed structural analysis of the piping system and the combined results of static and dynamic loading influence determined. This part of the analysis has been perfomed by means of FEM computer software Bentley AutoPIPE as well as some use of ANSYS FEM program. Important step in this simulation there was the theoretical modal analysis. This analysis allows to predict possible vibroacoustic resonance in the structural system under specific conditions of the coincidence between acoustic excitation and modals. The results of the combined static and dynamic loadings analysis contain the information on the node displacements, internal forces, resulting stresses in the pipe walls and loads on the pump nozzles and piping supports.
Wybór zmiennych decyzyjnych w procesie optymalizacji półotwartego wirnika pompy wirowej do wspomagania układu krążenia.
(Wydawnictwo Politechniki Łódzkiej. Instytut Maszyn Przepływowych, 2013) Papierski, Adam; Błaszczyk, Andrzej; Woźniak, Dariusz
W pracy przedstawiono wybór zmiennych decyzyjnych w procesie optymalizacji półotwartego wirnika pompy wirowej do wspomagania układu krążenia. Podano przegląd stosowanych w obliczeniach funkcji celu, parametryzację geometrii wirnika oraz analizę wrażliwości zmiennych decyzyjnych.