Characteristic analysis of journal bearing under thin film lubrication—Layered Viscosity Model
Journal bearing is a kind of widely used bearing and its study never stops. The analysis is carried to journal bearing with layered viscosity model in this paper. Layered Viscosity Model regards viscosity as piecewise function and averages every segment in order to get more accurate expression, and the pressure distributing, load capacity and friction are obtained for journal sliding bearing under thin film lubrication. The condition of thin film lubrication actualizing is made certain. The theoretical base is provided for the analysis of aggradation and liniment surface layer lubrication. This work could promote the understanding and research of the mechanism of the nano - scale thin film lubrication.
Steady state performance of finite hydrodynamic journal bearing with three-dimensional irregularities
Abstract The steady state hydrodynamic lubrication of journal bearings with three-dimensional asperities is presented in this paper. The numerical procedure used incorporates a cavitation algorithm, which automatically predicts film rupture and reformation in the bearings. Numerical simulation results show that the pressure distribution caused by an asperity depends not only on asperity height but also on asperity dimension.
Graduate students’ experiences with standardized patients as adjuncts for teaching pelvic examinations
Purpose: To explore graduate nurse practitioner students’ perceptions of their experiences when learning to perform pelvic examinations in the laboratory and performing them in subsequent clinical rotations. One group was taught by faculty with voluntary peer examination, and the other two groups were taught by standardized patients (SPs). Data sources: Surveys with open‐ and closed‐ended (responses on Likert scales) items administered twice during 3 consecutive years to students enrolled in an advanced health assessment course. Conclusions: All groups reported feeling anxious while learning pelvic exam techniques and in subsequent clinical experiences. SPs provided immediate feedback to students, decreased their feelings of anxiety, and increased their confidence in performing examinations. Students who were taught pelvic examination techniques by SPs rated their learning experiences more positively and reported a better understanding of exam techniques than students who learned to perform exams by voluntary examination of classmates. Implications for practice: Graduate nursing programs should consider locating and using SP programs for teaching pelvic examinations in advanced health assessment courses. Although more cost‐effective, voluntary peer examination was a less effective teaching method.