Low Speed Bearing Condition Monitoring – A Case Study

The heath condition of worm-wheel gearbox is critical for the reliable and continuous operation of passenger escalators. The vibration sensor has been widely installed in the gearbox and the vibration level is usually utilized as a health indicator. However, vibration level is not robust in slow speed bearing condition monitoring. In this paper, the health condition of two slow speed bearings was evaluated using vibration data collected from sensors installed in the shaft. It has been shown that the vibration level fails to indicator the bearing health condition. The assessment accuracy can be improved by combining several simple methods

Bearing Signal Separation of Commercial Helicopter Main Gearbox

Gears are significant component in a multiplicity of industrial applications such as machine tool and gearboxes. An unforeseen failure of gear may result in significant economic losses. Therefore this research propose fault detection improvement throught series of vibration signal processing techuiques. These techniques have been tested experimentally using vibration data collected from the transmission system of a CS-29 ‘Category A’ helicopter gearbox under different bearing damage severity of the second planetary stage. Results showed successful improvement of bearing fault detection

Role of Endomucin in Hypoxia-Induced Retinopathy of Prematurity

Retinopathy of prematurity (ROP) is a major cause of blindness among premature, low birth weight infants as a result of pathological angiogenesis. Angiogenesis, the growth of new blood vessels from preexisting vessels, occurs in the veins and capillaries of the body. The process is highly regulated during early development and maturation. However, under abnormal conditions such as a decrease in oxygen levels or hypoxia, angiogenesis can become dysregulated and pathogenic. Currently, the best treatment for ROP is laser therapy, which does not significantly improve vision. Alternatively, glycoproteins are believed to play an important role in angiogenesis. Endomucin (EMCN), a glycoprotein, has been shown to be expressed by the venous and capillary endothelium. EMCN is believed to be associated with angiogenesis and could be a potential target for treatment of ROP. Thus, we hypothesize that EMCN is regulated by hypoxia and plays an important role in pathological angiogenesis. Human retinal endothelial cells (HRECs), representative of endothelial cells involved in retinal angiogenesis, were deprived of oxygen using a hypoxia chamber. We established the optimal oxygen dosage, determined the optimal cell density, and monitored EMCN expression at different time points after exposure to hypoxia. Changes in gene expression in response to hypoxia were compared to control cells. Our preliminary data indicates that EMCN is regulated by hypoxia. Currently, we are investigating whether EMCN has similar effects in regulating revascularization in vivo. Taken together, our study indicates a novel role for EMCN during hypoxia-induced angiogenesis which may serve as a therapeutic target

Unlocking the Doors to Patient Satisfaction in Pediatric Orthopaedics

Background Many hospitals continue to struggle to improve patient satisfaction as the identification of tangible quality improvement areas remains difficult Medicare hospital payments are linked to patient satisfaction and hospitals\u27 HCAHPS scores, which has contributed to the growing influence of patient satisfaction measures Investigation into the major drivers of patient satisfaction in the pediatric clinical arena has not been thoroughly pursued To determine the main drivers of patient experience in pediatric orthopaedics, we performed an analysis of patient satisfaction surveys collected from outpatient pediatric orthopaedic practices at 5 locations in 3 states Hypothesis: the patient-physician relationship is the most important factor in patients\u27 assessment of their experiences These results may have significance in aiding pediatric orthopaedic clinics in their Quality Assurance/Quality Improvement plans of enhancing the patient experiencehttps://jdc.jefferson.edu/pedsposters/1000/thumbnail.jp

A study on helicopter main gearbox planetary bearing fault diagnosis

The condition monitoring of helicopter main gearbox (MGB) is crucial for operation safety, flight airworthiness and maintenance scheduling. Currently, the helicopter health and usage monitoring system, HUMS, is installed on helicopters to monitor the health state of their transmission systems and predict remaining useful life of key helicopter components. However, recent helicopter accidents related to MGB failures indicate that HUMS is not sensitive and accurate enough to diagnose MGB planetary bearing defects. To contribute in improving the diagnostic capability of HUMS, diagnosis of a MGB planetary bearing with seeded defect was investigated in this study. A commercial SA330 MGB was adopted for the seeded defect tests. Two test cases are demonstrated in this paper: the MGB at 16,000 rpm input speed with 180 kW load and at 23,000 rpm input speed with 1760 kW load. Vibration data was recorded, and processed using signal processing techniques including self-adaptive noise cancellation (SANC), kurtogram and envelope analysis. Processing results indicate that the seeded planetary bearing defect was successfully detected in both test cases