Determination of gear resonance frequencies is necessary in thedesign of light weight aerospace gears. Resonant frequencies andmode shapes calculated are then identified as damaging ornon-damaging and compared to the gear’s mesh frequencies todetermine if gear tooth bending stresses will be amplified in aparticular operating speed range. Finite Element Analysis (FEA) iswell suited to determining gear resonant frequencies and modes. Inorder to verify the analysis quickly, rough gear geometry isfabricated and tested using accelerometers and a calibrated hammerin a modal excitation test. In past efforts, rough geometryfabricated was a simplified version of the final part minus gearteeth or other features. To reduce the time of fabrication and toincrease the accuracy of the prototype part, modern rapidprototyping manufacturing techniques may hold promise inapproaching the realism of the actual part with material propertiesthat are similar to material properties of gear steels. This paperstudies gear resonance modal excitation testing of two stage idlerspur gear rapid prototyped parts, using two different rapidprototyping techniques and compares results to the final productionpart and FEA model. Damaging and non-damaging modes andnomenclature will be reviewed as well as the testing method.
- Edition:
- 13
- Published:
- 09/01/2013
- Number of Pages:
- 11
- File Size:
- 1 file , 530 KB
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