Tutorial: Generator Tutorial on Operational Impacts

2021 ◽  
Author(s):  
Alejandro Felix ◽  
Russell Chetwynd
Keyword(s):  
Operational Impacts

You Have Co-Digestion, Now What? WERF Research into the Operational Impacts of Co-Digestion

2016 ◽  
Vol 2016 (3) ◽  
pp. 391-393
Author(s):  
Matt Van Horne ◽  
Jared Hostetler ◽  
Lauren Fillmore
Keyword(s):  
Operational Impacts

An Investigation of the Current Distribution in the Triaxial Cable and Its Operational Impacts on a Power System

2005 ◽  
Vol 15 (2) ◽  
pp. 1751-1754 ◽  
Author(s):  
M.A. Young ◽  
M.J. Gouge ◽  
M.O. Pace ◽  
J.A. Demko ◽  
R.C. Duckworth ◽  
...  
Keyword(s):  
Power System ◽  
Current Distribution ◽  
Operational Impacts

scholarly journals EXPERT EVALUATION OF DAMAGE THROUGH ENTERPRISE INFORMATION SYSTEM FAILURE

2020 ◽  
Vol 2020 (4) ◽  
pp. 112-120
Author(s):  
Valeriy Fedorovich Shurshev ◽  
Iurii Gostiunin
Keyword(s):  
Information System ◽  
Information Systems ◽  
Level Of Service ◽  
Service Availability ◽  
System Failure ◽  
Damage Evaluation ◽  
Critical Systems ◽  
Enterprise Information System ◽  
Enterprise Information ◽  
Operational Impacts

The article considers the problem of damage evaluation in case of failure of the information system. There have been analyzed the practical methods of assessing damage. It has been stated that the methods can reveal the dependence of the damage on the downtime of the information system, but they are unable to evaluate reputation, administrative or any other consequences. An algorithm is proposed by which specialists can conduct a comparative assessment of damage in case of failure of various information systems using expert information. Applying the proposed algorithm to different information systems, it is possible to determine the most critical systems and, on this basis, effectively plan operational impacts to increase the level of service availability.

scholarly journals Implications of a Narrow Automated Vehicle-Exclusive Lane on Interstate 15 Express Lanes

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Sahar Ghanipoor Machiani ◽  
Alidad Ahmadi ◽  
Walter Musial ◽  
Anagha Katthe ◽  
Benjamin Melendez ◽  
...  
Keyword(s):  
Data Analysis ◽  
Simulation Analysis ◽  
Careful Consideration ◽  
Human Capabilities ◽  
Crash Data ◽  
Automated Vehicle ◽  
The Difference ◽  
Differential Increase ◽  
Operational Impacts ◽  
Crash Data Analysis

The main objective of this study is to evaluate the safety and operational impacts of an innovative infrastructure solution for safe and efficient integration of Automated Vehicle (AV) as an emerging technology into an existing transportation system. Filling the gap in the limited research on the effect of AV technology on infrastructure standards, this study investigates implications of adding a narrow reversible AV-exclusive lane to the existing configuration of I-15 expressway in San Diego, resulting in a 9 ft AV reversible lane and, in both directions, two 12-feet lanes for HOV and FasTrak vehicles. Given the difference between the operation of AVs and human-driven vehicles and reliance of AVs on sensors as opposed to human capabilities, the question is should we provide narrower AV-exclusive roadways assuming AVs are more precise in lateral and longitudinal lane keeping behaviour? To accomplish the goal of the project, a historical crash data analysis and a traffic simulation analysis were conducted. Crash data analysis revealed that unsafe speed, improper turning, and unsafe lane change are the most recurring primary collision factors on I-15 ELs. AVs’ automated longitudinal and lateral control systems could potentially reduce these types of collisions on an AV-exclusive lane with proper infrastructure features for AV sensor operation (e.g., distinct lane marking). Microsimulation findings indicated an AV-exclusive lane may increase traffic flow and density by up to 14% and 24%, respectively. It also showed that average speed is reduced. However, this could lead to the speed differential increase between the exclusive lane and adjacent lane requiring careful consideration if additional treatments or barriers are needed. The results of this study contribute to infrastructure adaptation to AV technology and future AV-exclusive lanes implementations.

Evaluation of safety and operational impacts of bicycle bypass lanes at modern roundabouts

2008 ◽  
Vol 35 (10) ◽  
pp. 1025-1032 ◽  
Author(s):  
Essam Dabbour ◽  
Said M. Easa
Keyword(s):  
Traffic Signals ◽  
Signalized Intersections ◽  
Vision Impairment ◽  
Evaluation Scheme ◽  
Pedestrian Traffic ◽  
Negative Impacts ◽  
Operational Impacts ◽  
Full Utilization

Modern roundabouts have been found to improve safety and reduce overall delay, but they may have negative impacts on the safety of cyclists as other vehicles may cut-off cyclist paths while entering or exiting the roundabout. Several before–after studies have found an increase in traffic collisions involving cyclists at roundabouts after being converted from conventional signalized intersections. Another concern associated with roundabouts is the safety of pedestrians, especially pedestrians with severe vision impairment who may find difficulty in negotiating roundabouts. This paper evaluates safety and operational impacts of using bicycle bypass lanes at roundabouts as a means of increasing the safety of cyclists. The paper also recommends the full utilization of pedestrian traffic signals, proposed by other studies, by incorporating them with the proposed bicycle bypass lanes. An evaluation scheme involving the safety benefits and the costs of the proposed bypass lanes is provided to help practitioners decide when they are warranted. The evaluation scheme is illustrated using an application example.

Driver Reactions to Uphill Grades: Inference from a Stochastic Car-Following Model

2020 ◽  
Vol 2674 (11) ◽  
pp. 343-351 ◽  
Author(s):  
Tu Xu ◽  
Jorge Laval
Keyword(s):  
Maximum Likelihood ◽  
Likelihood Estimation ◽  
Truck Drivers ◽  
Model Parameters ◽  
Gravitational Effects ◽  
Car Following ◽  
Car Following Model ◽  
Operational Impacts ◽  
The Impact ◽  
Engine Power

This paper analyzes the impact of uphill grades on the acceleration drivers choose to impose on their vehicles. Statistical inference is made based on the maximum likelihood estimation of a two-regime stochastic car-following model using Next Generation SIMulation (NGSIM) data. Previous models assume that the loss in acceleration on uphill grades is given by the effects of gravity. We find evidence that this is not the case for car drivers, who tend to overcome half of the gravitational effects by using more engine power. Truck drivers only compensate for 5% of the loss, possibly because of limited engine power. This indicates not only that current models are severely overestimating the operational impacts that uphill grades have on regular vehicles, but also underestimating their environmental impacts. We also find that car-following model parameters are significantly different among shoulder, median and middle lanes but more data is needed to understand clearly why this happens.

Engine Design and Operational Impacts on Particulate Matter Precursor Emissions

2005 ◽  
Author(s):  
Stephen P. Lukachko ◽  
Ian A. Waitz ◽  
Richard C. Miake-Lye ◽  
Robert C. Brown
Keyword(s):  
Particulate Matter ◽  
Initial Conditions ◽  
Operating Mode ◽  
Radiative Properties ◽  
Aircraft Emissions ◽  
Commercial Aviation ◽  
Technological Differences ◽  
Engine Design ◽  
Temporal And Spatial ◽  
Operational Impacts

Aircraft emissions of trace sulfur and nitrogen oxides contribute to the generation of fine volatile particulate matter (PM). Resultant changes to ambient PM concentrations and radiative properties of the atmosphere may be important sources of aviation-related environmental impacts. This paper addresses engine design and operational impacts on aerosol precursor emissions of SOx and NOy species. Volatile PM formed from these species in the environment surrounding an aircraft is dependent on intra-engine oxidation processes occurring both within and downstream of the combustor. This study examines the complex response of trace chemistry to the temporal and spatial evolution of temperature and pressure along this entire intra-engine path, after combustion through the aft combustor, turbine, and exhaust nozzle. Low-order and higher fidelity tools are applied to model the interaction of chemical and fluid mechanical processes, identify important parameters, and assess uncertainties. The analysis suggests intra-engine processing is inefficient. For engine types in-service in the large commercial aviation fleet, mean conversion efficiency (ε) is estimated to be 2.8% to 6.5% for sulfate precursors and 0.3% to 5.7% for nitrate precursors at the engine exit plane. These ranges reflect technological differences within the fleet, the variation in oxidative activity with operating mode, and modeling uncertainty stemming from variance in rate parameters and initial conditions. Assuming sulfur-derived volatile PM is most likely, these results suggest emission indices of 0.06–0.13 g/kg-fuel assuming particles nucleated as 2H2SO4·H2O for a fuel sulfur content of 500 ppm.

Gainesville Regional Utilities Kelly Plant Asset Management With Cycling Operation

2015 ◽  
Author(s):  
Douglas Hilleman ◽  
John M. Lindsay ◽  
Tim Hinson
Keyword(s):  
Asset Management ◽  
Distribution System ◽  
Peak Load ◽  
Combined Cycle ◽  
Thermal Systems ◽  
Fuel Storage ◽  
Pumping Equipment ◽  
Business District ◽  
Operational Impacts ◽  
Transmission And Distribution

Gainesville Regional Utilities (GRU) is a fully vertically-integrated utility with electric power generation, transmission, and distribution system owned by the City of Gainesville, FL. We have two primary generating plant sites: Deerhaven with two conventional coal-fired steam units (DH1 and DH2) and John R. Kelly (JCC1) combined-cycle Unit 1. Kelly Station (the focus of this study) is located in southeast Gainesville near the downtown business district. It has one - 120 MW combined-cycle unit (JCC1) in 1 × 1 configuration, consisting of: one GE Frame 7E combustion turbine (dual fuel), one Applied Thermal Systems two pressure HRSG, one 50-year old Westinghouse steam turbine unit with cooling tower, fuel storage, pumping equipment, transmission, and distribution equipment. In 2013, GRU with a seasonal peak load of approximately 500 MWs was to start receiving the output of a new 100 MW bio-fuel plant under a purchase power agreement. It was apparent that the operation of the GRU units would drastically change. It was predicted by GRU that DH2 a 255 MW coal unit would move to a cycling duty unit and the Kelly combined-cycle unit would be relegated to “peaking” operation. To better understand and predict future operational impacts, GRU contracted with Intertek AIM (APTECH) to conduct a Cost of Cycling study. This paper is our presentation of the results of the study and the changes that were indicated by the cycling analysis to manage the GRU system at the lowest cost and to incorporate the new modes of cycling operation. The expected modes of operation based on the results of the study were reversed to use the lowest cost unit for frequent cycling of JCC1 and changed the previously base loaded coal unit DH2 into a seasonal unit with long seasonal shut downs. This paper further shows the actions implemented by GRU at Kelly station to improve the cycling response and reduce the damage impact of each cycle by managing the startup ramp rates of the limiting equipment. The plant had limited budget for capital improvements and focused principally on managing the cost by modifying the startup procedures using real time operating data. Our conclusion was that by following the report recommendations, a new “Start Model” produced repeatable and acceptable results that minimized possible damage to the unit while meeting the need to use the renewable energy and support the customer by providing power at the lowest cost. The paper will demonstrate the improvement areas, the actual changes, and the results of those changes to the cycling data and the savings due to reduced damage.

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