A method of analysis is presented for low-amplitude roughness in line contacts. The technique deals with two-dimensional sinusoidal profiles where the roughness may be moving relative to the contact and shows that the non-linear two-dimensional time-varying problem can be reduced to the solution of a linear one-dimensional steady state equation. This removes many of the computational problems associated with rough elastohydrodynamic lubrication and enables solutions for a wide variety of operating conditions and surface profiles to be obtained rapidly. A number of examples are given to illustrate the method.
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