Robert S. Wagoner
= Robert S. Wagoner
{c}
<Robert S. Wagoner> is a coauthor of experimental research using <rotating accelerometers> to detect damage in transmission <gears>. In the2015 report with <David G. Lewicki> and <Nicholas A. Lambert>, his affiliation is Ridgetop Group. The experiment compared embedded <microelectromechanical system> sensors with stationary housing sensors while an intentionally notched pinion was run toward tooth failure.<Evaluation of MEMS-Based Wireless Accelerometer Sensors in Detecting Gear Tooth Faults in Helicopter Transmissions by David G. Lewicki and others>[Title page and printed pp.1–5, author affiliation, experimental objective and notched tooth]{ref}
A central signal-processing problem was separating repeatable shaft-related motion from unrelated vibration. The study reconstructed a rotation timing signal from a strong periodic component of the measured data and used it for <time-synchronous averaging>. Its comparison with a measured timing reference tested whether that reconstruction preserved the rotation-related waveform.<Evaluation of MEMS-Based Wireless Accelerometer Sensors in Detecting Gear Tooth Faults in Helicopter Transmissions by David G. Lewicki and others>[Printed pp.24–25, reconstructed timing signal and Figure21 comparison]{ref}
The underlying averaging idea can be illustrated by records $a_j(\theta)=g(\theta)+\eta_j(\theta)$ aligned at the same shaft angle. Averaging $M$ revolutions preserves the repeatable waveform $g$; independent zero-mean noise with common variance $\sigma^2$ has mean-record variance $\sigma^2/M$. Timing error or changing operating conditions breaks those assumptions. This distinguishes detecting a repeatable vibration feature from proving that it uniquely identifies a tooth defect. The report found that fault indicators generally responded near actual tooth fracture, limiting the demonstrated early-warning interval.<Evaluation of MEMS-Based Wireless Accelerometer Sensors in Detecting Gear Tooth Faults in Helicopter Transmissions by David G. Lewicki and others>[Conclusions, printed p.30, point5]{ref}