19th Annual PKP Student Research and Fine Arts Conference: Oral Symposia II
Resonance is Futile: Benchmarking the Maximal Dose-Release of the Arduino System
BENCHMARKING OF SRNL ENVIRONMENTAL DOSIMETRY CODES TO GENII VERSION 2.10.1(2018-02-12)GENII2.10.1 is a dosimetry program developed at Pacific Northwest National Laboratory (PNNL) that recently passed DOE (U.S. Department of Energy) safety software quality assurance and was approved for DOE's safety software Central Registry. The GENII 2.10.1 system compiles several programs for estimating radiation dose, risk and cancer incident due to routine radionuclide releases into the environment. Methods for calculating dose include aqueous, atmospheric, individual, populations, chronic releases, and acute releases. The available methods include atmospheric transport, surface water transport, waste/soil redistribution, and terrestrial uptake. Current Site input parameters had to be verified, and unknown Site parameters had to be defined and tested for GENII 2.10.1 calculations. This project transferred current SRS models, usage parameters, transfer factors, bioaccumulation factors and uploaded them to the GENII 2.10.1 environmental dosimetry code for use at the Savannah River Site and was tested to demonstrate SRS is in compliance with DOE Order 458.1 (2011a).
NESHAP AREA-SPECIFIC DOSE-RELEASE FACTORS FOR POTENTIAL ONSITE MAXIMALLY EXPOSED INDIVIDUAL LOCATIONS USING CAP88-PC VERSION 4.0(2018-02-12)Operations at Savannah River Site (SRS) result in emissions of radionuclides into the air that can cause health problems to exposed individuals. To ensure the public dose standards are met, the Environmental Protection Agency (EPA) set regulations known asthe National Emission Standards for Hazardous Air Pollutant (NESHAP) that prohibit certain activities in the facility. A maximally exposed individual (MEI) is a hypothetical adult living offsite that is representative of the general population that could potentially receive the maximum dose of radiation. The total effective dose (TED) to an MEI is routinely estimated to demonstrate compliance with NESHAP. EPA's software system CAP88 is used for the dose calculations. For my project, I found the dose release factors (DRF) for three onsite locations (B-Area Barricade, Three Rivers Landfill, and Savannah River Ecology Lab Conference Center) that have a potential to be open to members of the public. The DRFs represent the dose to a receptor exposed to 1 Ci of aspecified radionuclide being released into the atmosphere. The DRFs were applied to expected radionuclide release rates from each area of the site to estimate the potential dose to an onsite MEI. Comparison of the source-to-receptor distances, meteorological data, and total dose were collected and submitted as per NESHAP's reporting regulations. Data indicates that an MEI at Three Rivers Landfill would receive 40.93% increased dose compared to the 2016 NESHAP maximum offsite location. The potential MEI dose at Three Rivers Landfill fall at 3.40E02 mrem which is below the public dose limit of 10 mrem for atmospheric releases.
RESONANCE REPULSION IN A COUPLED TORSIONAL OSCILLATOR(2018-02-12)A mechanical system is developed and investigated to demonstrate properties of two coupled oscillators. The experimental setup consists of masses clamped to a single steel wire used as a torsion oscillator and optical lever to monitor the motion of the system. Adjustment of the spacing between the masses allows for the coupling strength between the two oscillators to be varied. The primary feature of the system examined in this work is the shifting of the resonant frequencies of the coupled oscillators from the resonant frequencies of the isolated oscillators, an effect known as resonance repulsion. The isolated oscillators are underdamped. The coupling strength between the two oscillators is varied by changing the length of wire between the two. The length was varied by a factor of ten. Damping rates and resonant frequencies of the isolated oscillators are measured in order to model the coupled oscillator system. Theoretical predictions for the magnitude of the resonance repulsion effect are compared to experimentally determined values. For the weakest coupling conditions, where small measurement uncertainties may have a large impact, the disagreement between theory and experimental values for resonance repulsion is only 5%. For conditions of strongest oscillator coupling, the two resonances were observed to separate by a factor of 14.07 when compared to the resonant frequency separation in the uncoupled oscillator. For the strongest coupling case the experimental angular frequency separation is 39.22/s, theoretical is 39.40/s, and the uncoupled separation in the original isolated oscillators is 2.80/s.
Design and Testing of an Arduino-based PID Control System(2018-02-12)Drones depend on advanced control systems for successful flight. Because drones are subjected to strong variable drag and gravitational forces during flight, there is a need for onboard sensors, monitored by microcontrollers, to correct mid-flight vectors. We have designed and tested a stabilization system using Proportional-Integral-Derivative (PID) control to balance a 2 degree-of-freedom platform. We use anAXL9250 accelerometer/gyroscopic sensor interfaced to an Arduino microcontroller. This combination of Arduino microcontroller, PID control algorithm, and accelerometer/gyroscopicsensor allow us to balance two electronic ducted fans in a stable hovering configuration.Design parameters including electronics, PID control algorithm, and mechanical setup will be presented.