Vibration-Based Diagnostics for Rotary MEMS

Apex Seals for a MEMS Rotary Engine

This paper presents possible solutions to the problem of leakage in the MEMS rotary engine currently being developed at U.C. Berkeley. The project is motivated by the challenge to develop a system capable of a higher specific energy than primary batteries. Currently, leakage is the limiting factor in obtaining an engine with an acceptable efficiency. Fluidic analysis has been done to determine ...

Vibration Analysis of Rotary Compressors

By theoretically analyzing dynamic behavior of the crankshaft, the rolling piston and the blade inrolling-piston rotary compressors, constraint forces and sliding speed at each pair of movable machine elements were obtained, and unbalanced inertia forces and compressor vibrations were evaluated. It was concluded that theoretical results have a goodagreement with experimental ones. Moreover, it ...

Vibration Diagnostics for Industrial Electric Motor Drives

Vibration-Acoustics Study of R410A Rotary Compressors

This paper demonstrates a typical process to investigate the vibro-acoustic behavior of R410A rotary compressors. The compressor shell is usually the main noise radiator in a rotary compressor. However, the accumulator shell can be a significant noise source as well, although its size is relatively small. Sound performance of a rotary compressor is affected not only by the dynamic characteristi...

Current Issues in Vibration-Based Fault Diagnostics and Prognostics

Current issues in vibration-based fault diagnostics and prognostics are: (a) fault/damage identification; (b) localization; and (c) monitoring. The fault/damage identification and localization are needed for diagnostics. The monitoring allows observing the fault/damage progression in time. Based on monitoring, the prognostics of the moment of failure, and hence of the remaining life could be pe...