Edevar Luvizotto Junior

Method to Estimate Complete Curves of Hydraulic Pumps through the Polymorphism of Existing Curves

AbstractModeling of hydraulic machines is fundamental in steady and unsteady analysis. The simulations carried out in different scenarios will define the need for protection devices or other mechan...

Non-Elastic Matrix Model for Hydraulic Networks Calculation

This paper presents a non-elastic matrix model to calculate hydraulic networks, based on a method created by Nahavandi and Catanzaro (Journal of Hydraulics Division, 99(HY1), pp.47-63, 1973). It is a method that calculates the discharges and pressure heads in hydraulic networks for the steady state, for the extended period and for the transient state. This method has advantages concerning the Cross method, because the latter does not allow the calculation of transient situations such as the settings of valves, the starting and stopping of boosters, the branch ruptures, etc. The applicability of the method created by Nahavandi and Catanzaro was enhanced, because the programming and input data to consider the presence of valves, reservoirs or boosters in the hydraulic network were developed. Furthermore, the mathematical formulation and programming to calculate the extended period and transient state were also developed. The matrix method is working well, because the model was applied to calculate some hydraulic networks used as examples and the values calculated by the model are similar to the ones obtained from the technical literature.

Medindo a velocidade de escoamento em 2 posições para o cálculo da vazão em tubos

This paper utilizes the maximum entropy model to calculate discharges in pipes. The proposed model requires the flow velocities to be gauged in just two positions along the pipe radius to calculate the discharge of any given pipe with circular cross-section regardless its diameter size. A genetic algorithm is used to determine the two parameters of the entropy equation for pipe flow. Three water mains are assessed. The discharge values achieved by the maximum entropy model coupled to the genetic algorithm for two water mains are compared to those achieved by a calibrated AquaProbe ABB electromagnetic flow meter and remain within the device accuracy (± 2%), as reported by its manufacturer. A Cole type Pitot tube in series with a Venturi tube are used to respectively define three velocity profiles and gauge three different discharges for the third water main. The three discharge values obtained by the maximum entropy model are compared to the ones obtained by the Venturi tube and remain within the presented uncertainties (3.3%, 3.1% and 2.8%) for each discharge gauged by the Venturi tube. The discharge calculation in any given pipe is facilitated by the presented method.

Desenvolvimento de interface gráfica para programa de dimensionamento econômico de redes de distribuição de água utilizando Simulated Annealing

Resumo As redes de distribuição de água são partes vitais e com maior custo de investimento dos sistemas de abastecimento urbanos. Portanto, é de suma importância que sua implementação tenha o menor custo possível. Para que fossem encontrados os diâmetros ótimos da tubulação de uma dada rede a ser projetada, em projeto anterior, foi desenvolvido um algoritmo de otimização para dimensionamento de redes de distribuição de água utilizando Simulated Annealing e o simulador hidráulico EPANET (US EPA). Este projeto desenvolveu uma interface gráfica para que fosse possível a utilização do programa pelos usuários para tratamento geral de diferentes redes de abastecimento, pois as modificações dos parâmetros utilizados no dimensionamento podem ser feitas sem quaisquer alterações no código fonte, não necessitando de conhecimento em linguagem computacional por parte do usuário.

Optimization of Hydraulic Network Operation by a Hybrid Model (Hydrodynamic-Genetic)

This report presents a hybrid model that calculates the heads and flow rates of a hydraulic network system and then uses a genetic algorithm to optimize the operational control of the hydraulic network. To calculate the steady flow and the extensive period it was used the Matrix Method. The GA used binary numbers. The objective function minimizes the sum of the dissipated hydraulic power in the whole network of all calculated periods during the day. The hybrid model part that refers to the hydraulic calculation is working satisfactorily, because the values calculated by the model applied to the networks used as examples are similar to the ones obtained from the technical literature. The hybrid model part that refers to the GA is working satisfactorily, because the objective function values calculated by the model converged whenever the elitism was used. The proposed optimization in this work is to be used in hydraulic networks that present operational problems that need to be solved either installing valves or having installed valves.