The design and analysis of single flank transmission error testor for loaded gears

Due to geometrical imperfections in gears and finite tooth stiffnesses, the motion transmitted from an input gear shaft to an output gear shaft will not have conjugate action. In order to strengthen the understanding of transmission error and to verify mathematical models of gear transmission error, a test stand that will measure the transmission error of a gear pair at operating loads, but at reduced speeds would be desirable. This document describes the design and development of a loaded transmission error tester. For a gear box with a gear ratio of one, few tooth meshing combinations will occur during a single test. In order to observe the effects of different tooth mesh combinations and to increase the ability to load test gear pairs with higher gear ratios, the system was designed around a gear box with a gear ratio of two

Field Evaluation of a Solar Energy Intensifier-Thermal Energy Storage System

Solar energy has been recognized as a potential source of energy for low-temperature agricultural applications. Many processes, such as space heating, drying of farm products or waste materials, and water heating require low-temperature heat which can be supplied by solar radiation. Hellickson, et. al. circumstances attractive to which make solar energy the agricultural industry circumstances were: 1. Adequate land area, 2. Numerous processes requiring low temperature rise, 3. Compatibility between low temperature rise and high solar system efficiency, resulting in lower cost, and 4. Availability of the necessary air moving equipment as part of existing crop drying and livestock ventilation systems. Research was begun at South Dakota State University in 1976 on a practical solar system for agricultural applications. Investigation centered around a low-cost, multi-use system which was portable and required a minimum of maintenance. The present design evolved through extensive testing and evaluation of several design configurations and various construction materials. The system was designed to be in use year-round for crop drying, ventilation air preheating, and water heating so that the economic return on the investment could be maximized. Performance of the solar system was tested in laboratory and field conditions for short durations. However, long term performance of the SEI -TES system in a commercial application had not been documented. Clearly, the most reliable performance ratings belong to those systems which have undergone extended testing in the field. Therefore, research was initiated with the following objectives: 1. Evaluate and document the performance of the SEI-TES system under actual ventilation air preheating conditions at an operating livestock production facility. 2. Compare conventional solar-assisted facility non-solar facility. 3. Identify problems that result from actual field use and recommend design changes which will improve the effectiveness of the system. 4. Recommend design parameters for sizing systems to be installed in ventilation heating applications. 5. Compare solar-system costs with the value of conventional fuel saved

Engaging Students Engaging Industry Engaging Enterprise

A reflective piece on how a small team of students and academics gained more awareness of their own sense of enterprise and creativity. The case study examines the phases and crisis points of the whole event process and identifies some of the key learning outcomes for all involved

Electrical Tuning of Single Nitrogen-Vacancy Center Optical Transitions Enhanced by Photoinduced Fields

We demonstrate precise control over the zero-phonon optical transition energies of individual nitrogen-vacancy (NV) centers in diamond by applying multiaxis electric fields, via the dc Stark effect. The Stark shifts display surprising asymmetries that we attribute to an enhancement and rectification of the local electric field by photoionized charge traps in the diamond. Using this effect, we tune the excited-state orbitals of strained NV centers to degeneracy and vary the resulting degenerate optical transition frequency by >10 GHz, a scale comparable to the inhomogeneous frequency distribution. This technique will facilitate the integration of NV-center spins within photonic networks.Comment: 10 pages, 6 figure