Dynamic Oil Film Pressure Distribution Of Tilting-pad Sliding Bearing Basing On Piezoelectric Thin Film Sensor

With better stability, tilting-pad sliding bearings have been increasingly used in large-scale rotating machinery. However, there still exist many unstable problems in industry engineering applications where oil-film force places an important role. Oil film pressure distribution of tilting-pad sliding bearing is one hotspot with great difficulty in rotor dynamics and bearing lubrication field. Although different calculation models, software simulation and indirect experimental measurements have been introduced, there still requires direct methods to work out the problem of accuracy and adaptability. In this paper, research work can be divided into following aspects.(1) The structural of tilting-pad sliding bearing is designed to meet the requirement of experiment conditions. Based on geometrical model, one oil film pressure distribution model is brought forward with the judgment of beginning condition of oil film.(2) In comparison with PVDF, two piezoelectric pressure sensors are designed to meet oil film pressure distribution of tilting-pad sliding bearing and journal bearing for which experiments are conducted, such as linearity relationship between applied load and voltage output, sensitivity with temperature and frequency and phase delay.(3) The mechanical and electrical connections are designed to build up the platform to measure the pressure distribution of oil film. The dynamic coefficients are analyzed to verify the feasibility of pressure sensors.(4) In comparison with theoretical calculation and software simulation, the results of experiments have relative consistency and differences in details.