In this paper, we present a new diagnosis and prognosis method using the degree of randomness (DoR) measure and Laplace test procedure. The abnormal events are detected based on changes of randomness of vibration signals. The trend of randomness is resulted from faulty components such as roller bearings. We aim at the early detection of semi-failure events through the use of Laplace test statis...

The strain field within automotive roller bearings is intense but small in area (~150-250 um in length.) Dual Ended Tuning Fork (DEFT) resonators fabricated in a Silicon-on-Insulator process are examined as strain sensors for this application using Euler-Bernoulli beam theory. Frequencies of between 990 70and 780 40 kHz were found for .25% strained DEFT’s with strain sensitivities greater than ...

The internal leakage has a great effect on the performance of a rotary compressor. In this paper a leakage model as a part of a complete simulation model is developed. The leakage model analyzes the oil/refrigerant mixture leakage flow through the roller radial clearance caused by the motion of roller relative to cylinder wall and the pressure difference and considers the effect of the motion o...

With 300,000,000 riders annually, roller coasters are a popular recreational activity. Although the number of roller coaster injuries is relatively low, the precise effect of roller coaster rides on our brains remains unknown. Here we present the quantitative characterization of brain displacements and deformations during roller coaster rides. For two healthy adult male subjects, we recorded he...