Rotational speeds and loads may be held constant or varied, depending on the test specification. Each shaker is connected to the test bearing housing through a flexure that ensures that the test bearing housing is unconstrained in directions perpendicular to the shaking force. Static load is applied hydraulically through a spring‑isolated cable‑pulley system and two orthogonal electromagnetic shakers apply dynamic loads to the stator. A 37 kW variable speed electric motor, driving through a belt-and-pulley system provides shaft speeds of up to 16.5 krpm. The test rig features a simply‑supported, rotating shaft and a free‑floating test bearing housing located at the shaft midspan. Bearing load, race temperatures, power loss and accelerations are monitored and recorded by a data acquisition system. A telemetry system permits the measurement of inner race bearing temperatures. Rotational speeds, loads and oil flow rates may be held constant or varied dependent upon the test specification. The bearing under test is located at the overhung section of the shaft and can be lubricated via jet or under-race. Radial load is applied using a hydraulic ram by way of an overhead cable‑pulley system. The rig is powered by a 22 kW hydraulic motor, through a belt-and-pulley system. The test rig features an overhung, simply‑supported shaft and is capable of speeds above 35 krpm with test bearing radial loads as high as 4.5 kN. Normally the test samples are returned to the customer for further investigation at their facility. Post‑test the erosion of the seal is measured and recorded, along with test blade material loss. Rotational speed, incursion rate, incursion forces and rub temperature are recorded by a data acquisition system. Rotational speeds and incursion rates are determined by the test specification. Axial and radial movement of the fixtured test sample is controlled by a dual-axis incursion system incursion rates between 2.5 μm/s and 760 μm/s are possible. The test rig simulates operational wear using a bladed disc that is driven by an air turbine. ![]() evaluation of materials for honeycomb and abradable seals.experimental investigations of steady-state and dynamic performance of gas foil journal bearings.diagnostics, prognostics and health management (DPHM) for rolling-element bearings and gears.performance evaluation of high‑speed rolling‑element bearings.investigation of steady‑state and dynamic performance of journal bearings using unique test facilities and a state‑of‑the‑art computer modelling for plain and tilting pad bearings.The NRC Aerospace Research Centre's Tribology capabilities include:
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