Redundant actuating mechanism Patent

Design and development of release mechanism for spacecraft components, releasable despin weights, and extensible gravity boom

Vibration characteristics of the HPOTP (High Pressure Oxygen Turbopump) of the SSME (Space Shuttle Main Engine)

A review is presented of various rotordynamic problems which have been encountered and eliminated in developing the current flight engines, and continuing subsynchronous problems which are being encountered in developing a 109% power level engine. The basic model for the High Pressure Oxygen Turbopump (HPOTP) of the SSME including the structural dynamic model for the rotor and housing and component models for the liquid and gas seals, turbine-clearance excitation forces, and impeller-diffuser forces are discussed. Results from a linear model are used to examine the synchronous response and stability characteristics of the HPOTP, examining bearing load and stability problems associated with the second critical speed. Various seal modifications are examined and shown to have favorable consequences with respect to bearing reactions and stability

Effects of Ultra-Clean and centrifugal filtration on rolling-element bearing life

Fatigue tests were conducted on groups of 65-millimeter bore diameter deep-groove ball bearings in a MIL-L-23699 lubricant under two levels of filtration. In one test series, the oil cleanliness was maintained at an exceptionally high level (better than a class "000" per NAS 1638) with a 3 micron absolute barrier filter. These tests were intended to determine the "upper limit" in bearing life under the strictest possible lubricant cleanliness conditions. In the tests using a centrifugal oil filter, contaminants of the type found in aircraft engine filters were injected into the filters' supply line at 125 milligrams per bearing-hour. "Ultra-clean" lubrication produced bearing fatigue lives that were approximately twice that obtained in previous tests with contaminated oil using 3 micron absolute filtration and approximately three times that obtained with 49 micron filtration. It was also observed that the centrifugal oil filter had approximately the same effectiveness as a 30 micron absolute filter in preventing bearing surface damage

Transfer molding of PMR-15 polyimide resin

Transfer molding is an economically viable method of producing small shapes of PMR-15 polyimide. It is shown that with regard to flexural, compressive, and tribological properties transfer-molded PMR-15 polyimide is essentially equivalent to PMR-15 polyimide produced by the more common method of compression molding. Minor variations in anisotropy are predictable effects of molding design and secondary finishing operations

Communication in the Technical Organization

Virtually all businesses and organizations have communication problems * The aerospace business is no exception and has its share of normal as well as peculiar communication problems. With reasonable attention to communication problems and weaknesses, basic causes can be identified and appropriate solutions provided. This paper addresses itself to communication concerning the technical organization as well as the individual. Analysis is made of the cause of communication problems with both the organization and the individual within the organization. Causes of miscommunication are identified, and corrective as well as preventive remedies are presented

Effect of filtration on rolling-element-bearing life in contaminated lubricant environment

Fatigue tests were conducted on groups of 65 millimeter-bore ball bearings under four levels of filtration with and without a contaminated MIL-L-23699 lubricant. The baseline series used noncontaminated oil with 49 micron absolute filtration. In the remaining tests contaminants of the composition found in aircraft engine filters were injected into the filter's supply line at a constant rate of 125 milligrams per bearing-hour. The test filters had absolute particle removal ratings of 3, 30, 49, and 105 microns (0.45, 10, 30, and 70 microns nominal), respectively. Bearings were tested at 15,000 rpm under 4580 newtons radial load. Bearing life and running tract condition generally improved with finer filtration. The 3 and 30 micron filter bearings in a contaminated lubricant had statistically equivalent lives, approaching those from the baseline tests. The experimental lives of 49 micron bearings were approximately half the baseline bearing's lives. Bearings tested with the 105 micron filter experienced wear failures. The degree of surface distress, weight loss, and probable failure mode were found to be dependent on filtration level, with finer filtration being clearly beneficial

PMH Connect, English (Greyscale for printing)

Mental health related symptoms and associated experiences in the perinatal period present challenges, particularly regarding identification and appropriate management. Perinatal Mental Health (PMH) screening occurs in clinical settings on a more regular basis than ever before thanks to validated screening measures used at perinatal visits; however, pregnant and parenting individuals report several concerns when completing these screeners and providers report barriers in addressing resultant findings. To address barriers and enhance the PMH screening experience, this team of clinicians and researchers propose a tool – the PMH Connect: a Perinatal Mental Health Screening Connection, Education, and Decision Aid – to be given at the same time as a PMH screener. The PMH Connect provides brief anticipatory guidance about PMH symptoms, normalizing trauma-informed language about prevalence, and provides a connection to resources in a supportive, unobtrusive manner. The PMH Connect helps patients feel heard and supported and provides resources to patients before they need them, decreasing the burden on pregnant and parenting individuals as well as those conducting the screening. The PMH Connect is designed to shift power to patients themselves, as valued experts on their own care team, by offering them connections to existing resources through this simple tool. Our hope is that the PMH Connect will have an impact on many of the barriers to effective PMH screening, assessment, and treatment by improving screening experiences and outcomes, with the ultimate goal of impacting health disparities in PMH screenings and care

PMH Connect, English, Full Color

Mental health related symptoms and associated experiences in the perinatal period present challenges, particularly regarding identification and appropriate management. Perinatal Mental Health (PMH) screening occurs in clinical settings on a more regular basis than ever before thanks to validated screening measures used at perinatal visits; however, pregnant and parenting individuals report several concerns when completing these screeners and providers report barriers in addressing resultant findings. To address barriers and enhance the PMH screening experience, this team of clinicians and researchers propose a tool – the PMH Connect: a Perinatal Mental Health Screening Connection, Education, and Decision Aid – to be given at the same time as a PMH screener. The PMH Connect provides brief anticipatory guidance about PMH symptoms, normalizing trauma-informed language about prevalence, and provides a connection to resources in a supportive, unobtrusive manner. The PMH Connect helps patients feel heard and supported and provides resources to patients before they need them, decreasing the burden on pregnant and parenting individuals as well as those conducting the screening. The PMH Connect is designed to shift power to patients themselves, as valued experts on their own care team, by offering them connections to existing resources through this simple tool. Our hope is that the PMH Connect will have an impact on many of the barriers to effective PMH screening, assessment, and treatment by improving screening experiences and outcomes, with the ultimate goal of impacting health disparities in PMH screenings and care

Software Engineering Development Environment For The Launch Processing System

Tasked with supporting a progressive Shuttle launch rate, Lockheed Engineering and Software Production set out in 1984 to address the need to increase software productivity. Attention was focused on innovative tools since existing computer development systems were being reallocated for Shuttle operational testing and launch activities. It became apparent that due to the highly integrated nature of software production activities, a solution involving a local area network of engineering workstations was required. After prototyping and proving the design for increasing productivity, Lockheed procured and installed a networked computing system which generated a state-of-the-art environment for software engineering. The introduction of this new technology not only brought about new methods of implementing software changes, it resulted in a culture change for nearly everyone involved in the development cycle

Including Legumes in Bermudagrass Pastures

Use of legumes in bermudagrass pastures did not affect summer cow gains in 2016. Forage availability was also similar where ladino clover was used in the Legume system compared with where Nitrogen (N) alone was used. Estimated forage crude protein (CP) was greater for the Legume than the Nitrogen system in early summer, but was similar by mid-summer