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Measurement of Transmission Error Using Rotational Laser Vibrometers

[+] Author Affiliations
Robert White

John Deere, Waterloo, IA

Vikrant Palan

Polytec, Inc., Tustin, CA

Paper No. DETC2007-34430, pp. 527-545; 19 pages
  • ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 7: 10th International Power Transmission and Gearing Conference
  • Las Vegas, Nevada, USA, September 4–7, 2007
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 0-7918-4808-6 | eISBN: 0-7918-3806-4
  • Copyright © 2007 by ASME


Transmission error is the quantity that best correlates with gear noise. Using gear inspection data, one can estimate transmission error, however actually measuring it is a substantial task. For the most part, there are two groups of people who measure transmission error: those doing gear inspection and researchers. While it could prove useful in gearbox development, it is rarely done in this context because the equipment required to make transmission error measurements doesn’t package well, is expensive, can be difficult to use and is generally not very flexible. Transmission error is usually measured on test stands built particularly for that reason. An alternative method for transmission error measurement is now available to the development engineer who desires to make this measurement on his gearbox (such as for transmission noise development). This technique makes use of two rotational laser vibrometers and a synchronous time averaging algorithm. The laser approach is particularly appealing because it requires very little modification to the gearbox. Furthermore, it allows one to access gears within the gearbox which do not extend through the gearbox walls. The laser approach, however, has some of its own special challenges, but when those are adequately addressed, one has the capability to measure transmission error between nearly any two gears in a gearbox.

Copyright © 2007 by ASME



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