Abstract
Dynamic gear testing has always produced controversial results since the testing apparatuses and measuring methods have failed to distinguish the eigen-behaviour of the gear-pair from vibrations coming from the inevitable excitation of shafts, housing-parts and other ancillary equipment. Numerical techniques for separating and identifying the gear-mesh signal from the acquired data have been developed, although this procedure requires specialised software tools and can only be implemented in special cases involving rigid gear arrangements. Nevertheless, this is not always feasible, as it is when the gear shafts need to be rotated in space to simulate positioning and assembly errors resulting in misalignment. In this work, a novel ultra-rigid thermo-hydraulic actuator design is proposed to use in a laboratory gear test rig able to quantify, control and reliably measure the dynamic characteristics of misaligned cylindrical gear-pairs in mesh. A comparative study over existing actuation solutions and a thorough eigen-frequency numerical analysis highlight the unique potential of the proposed design.
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