This paper is concerned primarily with the development of a gear noise test facility which is currently
being used to study the fundamental sources of gear noise excitation through the testing of carefully
controlled pairs of gears. The system was designed around a special variable center distance gearbox that
is capable of running a pair parallel axis spur or helical gears under conditions similar to those
encountered in an automobile transmission. The test facility allows the parametric study of various gear
design parameters, mounting conditions, and operating environments on the dynamic performance of a
gear pair. A discussion of various physical parameters which may be experimentally measured in an effort
to evaluate the dynamic performance of a gear pair is given. Three methods of computing dynamic
transmission error from torsional acceleration measurements are also presented.

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