Aero-acoustic performance comparison of core engine noise suppressors on NASA quiet engine C

The relative aero-acoustic effectiveness of two core engine suppressors, a contractor-designed suppressor delivered with the Quiet Engine, and a NASA-designed suppressor was evaluated. The NASA suppressor was tested with and without a splitter making a total of three configurations being reported in addition to the baseline hardwall case. The aerodynamic results are presented in terms of tailpipe pressure loss, corrected net thrust, and corrected specific fuel consumption as functions of engine power setting. The acoustic results are divided into duct and far-field acoustic data. The NASA-designed core suppressor did the better job of suppressing aft end noise, but the splitter associated with it caused a significant engine performance penality. The NASA core suppressor without the spltter suppressed most of the core noise without any engine performance penalty

A Peripheral Subsystem Optimized for Computer Image Generation Applications

Requirements for ever increasing realism in real time computer image generation for military mission and commercial training, have generated the need for a higher performance, more cost effective front-end processor. Current computer image generators front-end general purpose computers are reaching their performance limits in current architectures. The tasks of this processor include: realtime computations, magnetic disk control, data transfer and direct memory access to and from the balance of the image generator. A new front-end processor system is under development. This multiple-bus, multiprocessor architecture in and of itself does not address disk and external data transfer. A peripheral subsystem is therefore researched to satisfy these requirements. Industry standard peripheral buses and protocols are evaluated. A peripheral subsystem, compatible with this new front-end processor architecture, is proposed. The Intelligent Peripheral Interface is selected as the optimum peripheral subsystem for computer image generation application. An abbreviated design specification for the proposed subsystem is presented. The subsystem performs magnetic disk control, data transfer and direct memory access to and from the balance of the computer image generator while not compromising front-end computational performance. It is capable of addressing new levels of performance. Several Intelligence Peripheral Interface issues, specific to this computer image generation application, are investigated

Community Service Project for Senior Citizen

This community service project for a local senior citizen consisted of a complete construction package including: obtaining funding, purchasing necessary materials, schedule planning, design, development and construction of a mid-sized concrete staircase. Using the knowledge and prior practices I acquired while studying Construction Management at California Polytechnic University San Luis Obispo I was able to fulfill every aspect the client had requested. This staircase not only served as an easier walkway into the backyard of the home but also as a stormwater accessway allowing for minimal puddle and mud accumulation outside the clients front door. The projects material cost of an estimated $300 was made possible through funding provided by Austin Harkin, owner of AH Cullyvore Construction, a Peninsula Bay Area residential contractor. This concrete staircase simultaneously benefitted a senior citizen from my home town that was financially unable to fix a flooding problem, while honing the skills required of a future industry professional in planning, designing, collaborating and constructing

Effects of postexercise feeding on plasma testosterone, cortisol, and insulin following resistance exercise

The purpose of this study was to examine the effect of postexercise dietary intake on circulating levels of insulin, testosterone, cortisol, and testosterone:cortisol (T:C) after weight training exercise. [This is an excerpt from the abstract. For the complete abstract, please see the document.

Chamber shape effects on combustion instability

Rocket combustor shape effects on combustion instabilit

Comparison of NASA and contractor results from aeroacoustic tests of QCSEE OTW engine

The aerodynamics and acoustics of the over-the-wing (OTW) Quiet, Clean, Short Haul Experimental Engine (QCSEE) were tested. A boilerplate (nonflight weight), high-throat Mach number, acoustically treated inlet and a D-shaped OTW exhaust nozzle with variable position side doors were used. Some acoustic directivity results for the type "D" nozzle and acoustic effects of variations in the nozzle side door positions are included. It was found that the results are in agreement with those previously obtained

Acoustic performance of inlet multiple-pure-tone suppressors installed on NASA quiet engine C

The length of multiple-pure-tone (MPT) treatment required to reasonably suppress the MPT's produced by a supersonic tip speed fan was defined. Other suppression, broadband, and blade passing frequency, which might be accomplished were also determined. The experimental results are presented in terms of both far-field and duct acoustic data