Candidate: Eduardo Dalla Lana
Program: UFSC / POSMEC
Date: December, 2005
Advisor: Victor Juliano De Negri
Abstract: This work presents a theoretical and experimental study on the determination of efficiency of hydraulic gear pumps based on the analysis of the hydraulic fluid temperature at inlet and outlet ports. Considering the thermodynamics and fluid mechanics equations, the steady state behavior of the gear pump is described for different wear conditions. The model establishes the relationship between inlet and outlet temperatures and main variables such as pressure, torque, flow, and angular speed and, consequently, the pump efficiency. Several techniques to measure a reduction in pump efficiency have been discussed in the literature. However, a lot of them require high cost equipment, restricting their use. The proposed solution is based on connecting thermocouples to inlet and outlet hydraulic ports and the electronic processing of these measurements to give the reduction in pump efficiency. The results obtained were verified by experimental studies through a test rig operated by a data acquisition and control system. This technique can be used to assist a maintainer program avoiding a reduction in the efficiency of a hydraulic system and, consequently, a reduction in the machine productivity.
DALLA LANA, E. Avaliação do rendimento de bombas hidráulicas de engrenagens externas através de medição de temperatura. 2005. 100 p. Dissertação (Mestrado em Engenharia Mecânica). Universidade Federal de Santa Catarina, Florianópolis.