Browsing NDSU Faculty/Staff Research & Scholarship by Author "Lu, Pan"
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Detecting Sources of Ride Roughness by Ensemble Connected Vehicle Signals
Bridgelall, Raj; Bhardwaj, Bhavana; Lu, Pan; Tolliver, Denver D.; Dhingra, Neeraj (2022)It is expensive and impractical to scale existing methods of road condition monitoring for more frequent and network-wide coverage. Consequently, defects that increase ride roughness or can cause accidents will go undetected. ... -
Enhancement of Signals from Connected Vehicles to Detect Roadway and Railway Anomalies
Bridgelall, Raj; Chia, Leonard; Bhardwaj, Bhavana; Lu, Pan; Tolliver, Denver D.; Dhingra, Neeraj (2019)Frequent network-wide monitoring of the condition of roadways and railways prevent fatalities, injuries, and financial losses. Even so, agencies cannot afford to inspect vast transportation networks using present methods. ... -
Mining Connected Vehicle Data for Beneficial Patterns in Dubai Taxi Operations
Bridgelall, Raj; Lu, Pan; Tolliver, Denver D.; Xu, Tie (2018)On-demand shared mobility services such as Uber and micro-transit are steadily penetrating the worldwide market for traditional dispatched taxi services. Hence, taxi companies are seeking ways to compete. This study mined ... -
Railroad Track Condition Monitoring Using Inertial Sensors and Digital Signal Processing: A Review
Chia, Leonard; Bhardwaj, Bhavana; Lu, Pan; Bridgelall, Raj (2018)Inertial sensors such as accelerometers and gyroscopes have been widely used since the early 1990s to monitor the condition of transportation assets. Recent improvements in their performance, a reduction in cost, and sensor ... -
Ranking Risk Factors in Financial Losses From Railroad Incidents: A Machine Learning Approach
Dhingra, Neeraj; Bridgelall, Raj; Lu, Pan; Szmerekovsky, Joseph; Bhardwaj, Bhavana (2023)The reported financial losses from railroad accidents since 2009 have been more than US$4.11 billion dollars. This considerable loss is a major concern for the industry, society, and the government. Therefore, identifying ... -
Rolling-Stock Automatic In-Situ Line Deterioration and Operating Condition Sensing
Bridgelall, Raj; Lu, Pan; Tolliver, Denver D. (2013)Track and equipment failures dominate railroad accident causes. Railroads must visually inspect most tracks in service as often as twice weekly to comply with the Federal Track Safety Standards. They augment visual ... -
Signal Feature Extraction and Combination to Enhance the Detection and Localization of Railroad Track Irregularities
Bhardwaj, Bhavana; Bridgelall, Raj; Lu, Pan; Dhingra, Neeraj (2020)Tracks are critical and expensive railroad asset, requiring frequent maintenance. The stress from heavy car axle loads increases the risk of deviations from uniform track geometry. Irregularities in track geometry, such ... -
Signal Filter Cut-off Frequency Determination to Enhance the Accuracy of Rail Track Irregularity Detection and Localization
Bhardwaj, Bhavana; Bridgelall, Raj; Chia, Leonard; Lu, Pan; Dhingra, Neeraj (2019)A continuous condition monitoring system to detect and localize railroad track irregularities is achievable with inertial sensors onboard revenue service trains. However, the inaccurate geospatial position estimates of GPS ... -
Technology Developments and Impacts of Connected and Autonomous Vehicles: An Overview
Ahmed, Hafiz Usman; Huang, Ying; Lu, Pan; Bridgelall, Raj (2022)The scientific advancements in the vehicle and infrastructure automation industry are progressively improving nowadays to provide benefits for the end-users in terms of traffic congestion reduction, safety enhancements, ... -
Weigh-In-Motion System in Flexible Pavements Using Fiber Bragg Grating Sensors Part A: Concept
Al-Tarawneh, Mu'ath; Huang, Ying; Lu, Pan; Bridgelall, Raj (2019)Weight data of vehicles play an important role in traffic planning, weight enforcement, and pavement condition assessment. In this paper, a weigh-in-motion (WIM) system that functions at both low-speeds and high-speeds in ...