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Research Papers: Other (Seals, Manufacturing)

J. Tribol. 2019;141(11):. doi:10.1115/1.4044297.

The work presented in this paper describes a new approach to calculate the film profile, friction, and fluid transport of a reciprocating U-cup seal used in a hydraulic piston pump. An innovative partial lubrication model of the seal is developed, which connects the inverse hydrodynamic lubrication method and Greenwood–Williamson asperity contact model. Finite element models (FEM) were established to simulate deformation behavior under-mounted and pressurized process using finite element code ansys. Based on the finite element simulations, corresponding numerical calculations have been made using the matlab with the inverse hydrodynamic lubrication and asperity contact theories. The accuracy of these models was validated against existing experimental data to ensure that they can predict the sealing performance sufficiently. The effects of the operating parameters as well as the magnitude of interference on the sealing performance in terms of friction, fluid transport, and film thickness were discussed. The results of the simulation indicate that the interference fit, sealed pressure, and rod velocity play significant roles to improve the wear and seizure resistance capability that is critical to the service life of the seal.

Commentary by Dr. Valentin Fuster

Research Papers: Applications

J. Tribol. 2019;141(11):. doi:10.1115/1.4044296.

The objectives of this investigation were to design and develop an experimental turbocharger test rig (TTR) to measure the shaft whirl of the rotating assembly and the axial and frictional loads experienced by the bearings. The TTR contains a ball bearing turbocharger (TC) that was instrumented and operated under various test conditions up to 55,000 rpm. In order to measure the thrust loads on the compressor and turbine sides, customized sensors were integrated into the TC housing. The anti-rotation (AR) pin that normally prevents the bearing cartridge from rotating was replaced with a custom-made load cell adapter system. This sensor was used to measure the frictional losses in the bearing cartridge without altering the operation of the TC. Proximity sensors (probes) were also installed in the compressor housing to monitor shaft whirl. Axial load results indicated that the compressor side bears most of the thrust load. As the backpressure or the speed of the TC was increased, the thrust load also increased. Frictional measurements from the AR pin sensor demonstrated low power losses in the ball bearing cartridge. For certain shaft speed ranges, the data from the sensors illustrated periodic trends in response to the subsynchronous whirl of the shaft.

Commentary by Dr. Valentin Fuster

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