Turbojet Engine Demonstration with a High-Temperature, High-Speed Tribometer with Complex Motion

Heshmat, H., Tomaszewski, M.J., Walton II, J.F. and Jahanmir, S.  “High-Temperature, High-Speed Tribometer with Complex Motion,” ASME Paper WTC2005-63685, ASME WTC 2005, September 12-16, 2005, Washington D.C., (2005) Proceedings of the World Tribology Congress III – 2005, pp. 879-880.

Complex motions and wide variations in relative surface velocities are likely to be experienced in mechanical systems such as an engine (e.g., piston rings, wrist pins and crankshaft main bearings in a piston type engine). Currently available tribometers use simple motions and often a constant speed. A new tribometer is designed with the capability of three types of motions: (1) unidirectional rotary motion (similar to a conventional pin-on-disk tribometer),  (2) reciprocating sliding motion, and (3) complex multi-directional motion that can be achieved when the disk rotates and the pin reciprocates along a linear path. Depending on the pin location with respect to the center of the disk, the reciprocation frequency, and the rotational speed of the disk, a wide range of complex motions are possible. Tribological testing can be performed at contact loads up to 400 N, at speeds up to 80m/s, and temperatures of 600 oC in superheated steam. Due to complex motions, the measurement of friction force becomes challenging. To properly monitor the normal force and the friction force along two orthogonal axes, three force transducers are used. This unique design allows for the determination of tribological performance of advanced materials and coatings under conditions that simulate those encountered in small steam engines currently under development.

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