Measured displacement coefficients of an adjustable hydrodynamic journal rotor bearing

In simulating a proposed machine tool grinding wheel design, a bearing system comprised a stationary spindle or shaft with fluid film bearings supporting a belt driven rotor. Two hydrodynamic bearings acted in parallel, and built into the shaft were the means to effect continuous pro-active adjustments to their performance characteristics during operation, irrespective of load, speed and other running conditions. The design is outlined, as is a specially constructed test rig for evaluating it. A method for determining the combined displacement coefficients is given which used an incremental load technique with dedicated axis system selection. Observations are given on the bearings’ performance characteristics. The effects of the adjustments on rotor eccentricity are shown, along with the ability to maintain a given rotor eccentricity, including zero, irrespective of load and changes in load. Results of measured rotor displacements and displacement coefficients are also given showing that the bearing exhibited high stiffness at zero load and eccentricity, and that stiffness could be changed by adjustment if required, thereby “tuning” the system rotordynamics behaviour. Comparisons are made with results of others’ work on the measured displacement coefficients of a conventional type of tilting pad bearing. An approach to uncertainty estimation of measured data is included

Becoming Part of the Conversation through Assessment of Undergraduate Library Internships

Any recent attendee at an academic library conference would likely note the large number of panels, posters, presentations, and roundtables that focus on libraries partnering and collaborating with other campus stakeholders, such as admissions, international student services, the writing center, and so on. Our library is no different. Gettysburg College is a four-year liberal arts institution located in Gettysburg, Pennsylvania, with an enrollment of 2,600 students. Musselman Library serves its campus population with thirteen librarians and nineteen staff members. In a small college environment, collaborating with other campus stakeholders is not only desirable, it is essential if the library wants to move forward with any service or initiative. After decades of carefully developing relationships, cross-department and cross-division collaboration is an expectation and the norm, and the library has a reputation of being a strong partner. Colleagues across campus are open and receptive to new ideas that mean better serving students. Indeed, forming partnerships with stakeholders is part of the library’s current strategic plan.2 It is only through strategic partnerships with faculty and other administrators on campus that the library will be able to gain traction on its own goals around information literacy, diversity and inclusion, and communicating the library’s value with assessment data. The library’s participation in the third cohort (2015–16) of the Association of College and Research Libraries’ (ACRL) Assessment in Action (AiA) program enabled the library to partner with colleagues in our Office of Institutional Analysis and the Center for Career Development in order to assess the library’s long-standing, but never formally assessed, undergraduate library internship program. Through this distinctive program, the library has provided internships since 1998 for over 100 participants who have gone on to careers in libraries, archives, museums, and related fields