Relevant bibliographies by topics / Track stability management

Academic literature on the topic 'Track stability management'

Author: Grafiati
Published: 10 December 2022
Last updated: 19 February 2023

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Journal articles on the topic "Track stability management"

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Ahmad, Shah Sanjar, Nirmal K. Mandal, Gopinath Chattopadhyay, and John Powell. "Development of a unified railway track stability management tool to enhance track safety." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 227, no. 5 (September 2013): 493–516. http://dx.doi.org/10.1177/0954409713501490.

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Greenwood, Royston, and C. R. Hinings. "Organizational Design Types, Tracks and the Dynamics of Strategic Change." Organization Studies 9, no. 3 (July 1988): 293–316. http://dx.doi.org/10.1177/017084068800900301.

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Change and stability in organizations is to be understood through the twin concepts of design archetypes and tracks. Organizations operate with structural designs which are given meaning and coherence by underlying interpretive schemes. Particular interpre tive schemes coupled with associated structural arrangements constitute a design archetype. The temporal relationship between an organization and one or more archetypes defines an organization's track. Prototypical tracks include inertia, aborted excursions, re-orientations and unresolved excursions. The particular track followed by an organization will be a function of the degree of alignment or compatibility between structures and contingency constraints, the pattern of commitment to prevailing and alternative interpretive schemes and the incidence of interest dissatisfaction of powerful groups.
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Schultz, David, and Juan Carlos Díaz Vélez. "IceProd - a dataset management system for IceCube: update." EPJ Web of Conferences 214 (2019): 03058. http://dx.doi.org/10.1051/epjconf/201921403058.

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IceCube is a cubic kilometer neutrino detector located at the south pole. IceProd is IceCube’s internal dataset management system, keeping track of where, when, and how jobs run. It schedules jobs from submitted datasets to HTCondor, keeping track of them at every stage of the lifecycle. Many updates have happened in the last years to improve stability and scalability, as well as increase user access. Along the way, the IceProd codebase switched from Python 2 to Python 3.
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Shi, Yufeng, Gaohua Wu, Dan Li, Xutong Wang, and Dachuan Yu. "Research on the Cloud Platform for Urban Rail Transit based on Track Inspection Vehicle." Journal of Physics: Conference Series 2424, no. 1 (January 1, 2023): 012026. http://dx.doi.org/10.1088/1742-6596/2424/1/012026.

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Abstract The aim of this paper was to improve the automation of track inspection, data utilization rate, informationization of maintenance dispatch. We designed a track inspection vehicle based on multi-sensor information fusion, then gave the method of coordinate transformation and data fusion. And then researched the service of data displaying, data management and data analysis, proposed the system architecture and network topology, realized the system deployment on the cloud. And then demonstrated stability by comparing the results of two machine tests, and proved accuracy by comparing the results of machine tests with manual tests. The result shows that it had a high accuracy and stability. At last, designed the reserve of cloud platform function extension, discussed the method of data analysis. Research shows that, the track inspection vehicle can measure the track geometric parameter. The application of cloud platform technology can reduce the cost of operation, simplify the function extension. The research result has a positive impact on solving the current problem of track inspection, improving passenger comfort and ensuring safe operation.
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Dimitrievski, Martin, Peter Veelaert, and Wilfried Philips. "Behavioral Pedestrian Tracking Using a Camera and LiDAR Sensors on a Moving Vehicle." Sensors 19, no. 2 (January 18, 2019): 391. http://dx.doi.org/10.3390/s19020391.

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In this paper, we present a novel 2D–3D pedestrian tracker designed for applications in autonomous vehicles. The system operates on a tracking by detection principle and can track multiple pedestrians in complex urban traffic situations. By using a behavioral motion model and a non-parametric distribution as state model, we are able to accurately track unpredictable pedestrian motion in the presence of heavy occlusion. Tracking is performed independently, on the image and ground plane, in global, motion compensated coordinates. We employ Camera and LiDAR data fusion to solve the association problem where the optimal solution is found by matching 2D and 3D detections to tracks using a joint log-likelihood observation model. Each 2D–3D particle filter then updates their state from associated observations and a behavioral motion model. Each particle moves independently following the pedestrian motion parameters which we learned offline from an annotated training dataset. Temporal stability of the state variables is achieved by modeling each track as a Markov Decision Process with probabilistic state transition properties. A novel track management system then handles high level actions such as track creation, deletion and interaction. Using a probabilistic track score the track manager can cull false and ambiguous detections while updating tracks with detections from actual pedestrians. Our system is implemented on a GPU and exploits the massively parallelizable nature of particle filters. Due to the Markovian nature of our track representation, the system achieves real-time performance operating with a minimal memory footprint. Exhaustive and independent evaluation of our tracker was performed by the KITTI benchmark server, where it was tested against a wide variety of unknown pedestrian tracking situations. On this realistic benchmark, we outperform all published pedestrian trackers in a multitude of tracking metrics.
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Xin, Tao, Pengsong Wang, and Yu Ding. "Effect of Long-Wavelength Track Irregularities on Vehicle Dynamic Responses." Shock and Vibration 2019 (March 12, 2019): 1–11. http://dx.doi.org/10.1155/2019/4178065.

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Long-wavelength track irregularities have obvious influence on ride comfort and running stability of high-speed trains. Meanwhile, it brings risk to the inspection of track irregularities since ordinary inspection equipment has difficulties in covering long wavelengths. Previous research on the effect of long-wavelength track irregularities is rare. In order to find the relationship between long-wavelength irregularities and vehicle dynamic responses, a numerical vehicle-track coupling dynamic model based on multibody dynamics and finite element theories is established by using a self-compiling program. One case study is given as an example to show the methodology of determining the sensitive long wavelength and management amplitude of track longitudinal-level irregularities in high-speed railway. The simulation results show that the sensitive long wavelength has a strong correlation with train speed and natural frequency. The simulation and field test results are in good agreement.
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Gao, Liang, Wenqiang Zhao, Bowen Hou, and Yanglong Zhong. "Analysis of Influencing Mechanism of Subgrade Frost Heave on Vehicle-Track Dynamic System." Applied Sciences 10, no. 22 (November 16, 2020): 8097. http://dx.doi.org/10.3390/app10228097.

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Uneven subgrade frost heave has been a severe problem for the operation of high-speed railways in cold regions. In order to reveal the influencing mechanism of frost heave on the vehicle-track system, a novel FEM (finite element method) model based on an explicit algorithm was proposed. In the novel model, the existence of the leverage effect in slab track, which was caused by frost heave, was realistically reproduced at first, and then the vehicle model started running for evaluating the influence of the frost heave on the whole dynamic system. Results show that the leverage effect plays a key role in analyzing the influence of frost heave on the vehicle-track system, besides for track irregularity and contact loss. Specifically, the leverage effect decreases the stability of the slab track and causes an increase in dynamic irregularity. The roles of the track irregularity and the contact loss in the influencing mechanism were also revealed. With the ratio of wavelength to amplitude increasing, the track irregularity is gradually dominant in the influence mechanism of frost heave on the vehicle-track system. The research could provide a reference for the management and maintenance of the slab track in cold regions.
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Hui, Chen, and Qi zhenfang. "Optimal Design and Practice of the Construction Scheme for Laying the Whole Track Bed on the Subway Ballastless Track." E3S Web of Conferences 165 (2020): 04003. http://dx.doi.org/10.1051/e3sconf/202016504003.

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In the development of modern society, our country attaches more importance to the development of the construction industry, and strengthens the supervision, so that the construction industry can be developed to the mode of industrialization. That combining with the construction needs of prefabricated concrete assembly in our country and taking comprehensive analysis of various factors and application, can enhance the structural stability and safety of prefabricated concrete assembly, thus can meet the needs of the modern building industrialization development, and improve the overall quality and efficiency. In the development of subway transportation field, laying the whole track bed of Ballastless track is an important core work, which is the new construction of rail transit. This paper made perfect management system, carried out all kinds of work, improved the construction technology of the whole track bed and perfected the construction plan, with the result of prolonging the service life of the subway ballastless track and promoting the stable development of modern society in our country.
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SAHOO, PARTASARATHI, and IPPILI SAIKRISHNAMACHARYULU. "INVESTIGATION ON THE STABILITY AND DYNAMIC RESPONSE OF SOIL FOUNDATION UNDER HEAVY HAUL RAILWAY TRACKS." YMER Digital 21, no. 06 (June 29, 2022): 1162–71. http://dx.doi.org/10.37896/ymer21.06/b1.

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The roadbed is the most deformable and most heterogeneous segment of the railroad track foundation, which states the principal factor deciding the efficiency of the street, and the primary factor behind deterioration of path and its components, leading to the rise in the expense of current maintenance. Notwithstanding the expanding dynamic effect of trains on the railroad framework resulting from heavy haul transportation system, this issue turns out to be especially significant. In this paper, an examination is made of the issue of degradation and giving the strength to the track foundation with an increased axial load on the track, with a strict attention on examination of the excitation mechanisms of cyclic effects and the procedure of their damping by the soil environment. The principal kinds of deformations and defects are portrayed; the mechanisms and explanations behind their occurrence are studied in this paper. Much consideration is paid to the investigation of soil degradation procedures of the roadbed under the dynamic effect of heavy trains. Different components of the roadbed are taken into account, which require support for operation under substantial heavy traffic and huge axial loads. The advanced strategies and structures of strengthening the roadbed are portrayed, the utilization of which permits to build the proficiency of the heavy haul transportation. Taking everything into account, extensive research is carried out to address the issue of ensuring the stability of the roadbed in the association of heavy haul traffic.
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Liu, Yong, and Wei Huo. "Robust Output Regulation Approach for Attitude Control and Momentum Management of the Space Station." Applied Mechanics and Materials 719-720 (January 2015): 316–23. http://dx.doi.org/10.4028/www.scientific.net/amm.719-720.316.

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An novel methodology to solve the attitude control and momentum management problem of the space station with model uncertainties is developed. By the use of the robust output regulation theory, the attitude control and momentum management integrating model and the internal model of disturbances are combined to design a robust coupling controller such that the plant outputs track desired reference signals and the model uncertainties can be tolerated. It is proved that the designed controller guarantees stability of the closed-loop system and suppresses the disturbance well. Simulation results are provided to demonstrate the feasibility of the proposed method.
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Dissertations / Theses on the topic "Track stability management"

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(9776303), Sanjar Ahmad. "Ensuring track safety and reducing unnecessary train speed restrictions in hot weather by the application of a unified track stability management tool." Thesis, 2011. https://figshare.com/articles/thesis/Ensuring_track_safety_and_reducing_unnecessary_train_speed_restrictions_in_hot_weather_by_the_application_of_a_unified_track_stability_management_tool/13457612.

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"In this thesis, practices/procedures adopted by different railways to manage track stability have been collated and a gap analysis has been undertaken to help improve track stability. The analysis revealed that track stability management differs markedly/noticeably between railway companies, and that there is a need for a unified tool to determine the requirements of different preventive maintenance programs"--Abstract.

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(13966684), Ying M. Wu. "Development of rail temperature prediction model and software." Thesis, 2011. https://figshare.com/articles/thesis/Development_of_rail_temperature_prediction_model_and_software/21344169.

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The railway track buckling occurs all over the world due to inadequate rail stress adjustment, which is greatly influenced by the variation in weather induced rail temperature and the rigidity of the track structure. Climate change and the ever increase in extreme changes in temperatures have made buckling an ever more prevalent problem in the railway industry. The ultimate goal of any research in the area of track stability management is to comprehensively manage rail buckling and the subsequent procedures that follow after buckling. The first step to have a clear understanding of how the temperature change of the rail track is influenced by the environmental conditions. The second step is to have an accurate prediction of what the environmental conditions will be in the next day so that management procedure can be put into place.

This study aims to develop a model and software that is capable of predicting rail temperature 24 hours in advance that is as accurate for use in the rail buckling management. Two distinct and separate mathematical manipulations are performed to achieve this goal.

One method used weather forecasts from the Australian Bureau of Meteorology (BoM) and forecasts the weather for the location that the rail is situated. This involves using 3-dimensional cubic interpolation that is the weather parameters are interpolated in 2-dimensions geographically and then 1-dimensionally through time. An interactive software is written in MATLAB to convert the BoM raw data into a rail temperature forecast for this study. The result is a 15 -minute forecast for every 3.06 km. The second method used multivariate linear regression, to predict the rail temperatures 24 to 48 hours in advance.

To validate the rail temperature predications, 3 months field test spanning June, July and August 2010, is conducted on Queensland Rail's (QR) coal network, this involved erecting an automated weather station (AWS) and adhering temperature sensors on to a section of track. The guidelines of World Meteorological Organization's (WMO) were followed for implementation of the AWS on site (WMO 2008). The AWS model WXT520 , produced by Vaisala (Vaisala 2009) was used in this study which an off the shelf product that is similar to what some rail compaies are already using for continues monitoring of critical sites.

The temperature sensors (surface thermocouples) and an off the shelf product Salient system's rail -stress modules are used to measure rail surface temperatures on both rails of the track (Salient Systems Inc 2009). The sensors were attached to the surface of the rail track to directly measure temperature change of the rail profile throughout the diurnal cycle. Statistical correlations between the different measured points of the rail profile are evaluated in relation to the diurnal cycle to assess the accuracy of current rail temperature measuring practices.

Statistical evaluation of how well the BoM predictions compare with weather parameters at the field experimentation site are performed, so too is a statistical evaluation of the accuracy of the rail temperature model developed. The prediction model is compared with the existing empirical methods as found in the literature review and an assessment of track conditions. This is a flag ship study in Australia; the main purpose of this study is to prove in a test case scenario that a rail temperature forecast without use of weather instrumentation is possible and the accuracy of the prediction is as good if not better than the instrumentation calculation.

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Books on the topic "Track stability management"

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Rajagopalan, Ram E. Management of corrosive poisoning. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0329.

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Corrosive poisoning, typically with household chemicals, is a common problem in children and adults. As ingestion by adults is often intentional, they are usually associated with larger volumes of strong agents and have the potential to create more severe injury than that observed in the accidental ingestions commonly seen in children. The goal of acute care in these cases is to stabilize acute compromise of haemodynamics and to ensure patency of the injured airway. Blind placement of nasogastric tubes and attempts at dilution or neutralization of the ingested chemical are potentially hazardous and should be avoided. Early identification of oesophageal or gastric perforation by clinical evaluation and radiological testing will lead to early and appropriate surgical interventions for these complications. The primary focus after initial stabilization is to evaluate the extent of gastrointestinal injury by early endoscopy. The application of a standardized score to grade the injury allows risk stratification, the planning of nutritional support and referral for appropriate management of the chronic sequelae of scarring and stenosis of the injured gastrointestinal tract. No specific medical therapy can attenuate the extent of damage acutely nor alter the progression of chronic changes.
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Karnam, Gayithri. Public Expenditure in India. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780192857569.001.0001.

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Government is a major player in the development of an economy. Government’s public financial operations involving raising of revenue and its spending have considerable implications on the growth, distribution, and stability, necessitating a careful study to enable informed mid-course policy corrections to the macroeconomic developments. A critical review of public expenditure is imperative in ensuring optimal use of public resources for the maximization of welfare. The present book provides an empirical understanding of historical trends and composition of public expenditure at the central and the sub-national levels; the effectiveness of public expenditure control systems and accountability issues; the political economy of spending decisions; public expenditure reforms undertaken in India; and international best options that can guide the corrective process in India. Given the global shift in focus from ‘outlays’ to ‘outcomes’, it is important to put in place a sound framework to track the results of government expenditure programs to guide the informed expenditure decision-making process. The book documents the features of useful frameworks and steps involved in adopting a robust results framework. Fiscal management of Covid-19 is an important component of the book. The purpose of this volume is to reach out a comprehensive and updated understanding of empirical issues in public expenditure and its management in India to the students of public finance.
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Book chapters on the topic "Track stability management"

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"The Ecology and Management of Wood in World Rivers." In The Ecology and Management of Wood in World Rivers, edited by PETER A. BISSON, STEVEN M. WONDZELL, GORDON H. REEVES, and STAN V. GREGORY. American Fisheries Society, 2003. http://dx.doi.org/10.47886/9781888569568.ch21.

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<em>Abstract.</em>—Advances in understanding wood dynamics in rivers of western North America have led to several important management trends. First, there is a trend away from using “hard” engineering approaches to anchoring wood in streams toward using “soft” placement techniques that allow some wood movement. Second, wood is being placed in locations where channel form and hydraulics favor stability and where wood is likely to accumulate. Third, there is an increased emphasis on passive recruitment of wood from natural source areas (instead of active placement) where the likelihood that it will enter streams through channel migration, windthrow, and landslides is high. Fourth, restoration targets for wood loads are incorporating landscape-scale objectives; thus, managing wood to emulate the spatial and temporal variability produced by natural disturbances is replacing fixed prescriptions for wood in individual reaches. Predicting the effects of wood restoration on individual fish populations in western North America is problematic because local biophysical conditions generate so much experimental noise that it is rarely possible to partition the effects of wood restoration from other sources of variation. Development of appropriate monitoring techniques, combined with a regional network of experimental catchments that include restored and unrestored streams, would help track changes in population status and gauge the effectiveness of wood restoration efforts.
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Mosavi, A. A., and D. Torres. "Monitoring stability of high-speed rail tracks: A feasibility study." In Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations, 399–406. CRC Press, 2021. http://dx.doi.org/10.1201/9780429279119-51.

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Elizabeth Taylor, Jessica, and Devin Clegg. "Foreign Bodies and Bowel Obstructions." In Intestinal Obstructions. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92170.

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Foreign body ingestion most commonly occurs in the pediatric population, with approximately 80–90% of objects passing spontaneously in individuals who are evaluated by medical professionals. Objects may be lodged in a variety of anatomic locations. Only about 10% of foreign bodies progress past the stomach. Of the 10–20% of objects that fail to pass, less than 1% requires surgical intervention. Small bowel obstructions are a rare presentation of foreign body ingestions. There are case reports, guidelines, and retrospective reviews in the literature regarding the management of ingested foreign bodies. In patients who do not have spontaneous passage of foreign bodies, endoscopic and surgical techniques have been utilized for successful retrieval. The timing and indication for endoscopic intervention is dependent upon several factors, including the type and location of the foreign body and is also contingent upon patient symptoms. Numerous case reports and studies describe the successful endoscopic removal of foreign bodies in the upper and lower gastrointestinal tract. Although the type and location of an ingested object is critical for determining the success of endoscopic intervention, the patient’s clinical exam and stability is also an aspect to consider when deciding on management of bowel obstructions caused by foreign bodies.
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Conference papers on the topic "Track stability management"

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Wilk, Stephen. "Parameters Affecting Lateral Track Strength After Surfacing." In 2022 Joint Rail Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/jrc2022-78724.

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Abstract Over the past two years, Transportation Technology Center, Inc. (TTCI) has been investigating how tie and ballast parameters affect lateral track strength after surfacing. This investigation included both a literature review of previous work in the United States and single tie push tests (STPTs) performed under a variety of tie and ballast conditions at the Facility for Accelerated Service Testing (FAST) in Pueblo, CO. Knowing which parameters affect lateral tie strength and comparing the influence of the various parameters can help in lateral stability risk-assessments in continuously welded rail (CWR) track. The results of both the literature review and the STPT testing showed that the parameters of post-surfacing tonnage accumulation (for ballast density), tie type, ballast shoulder width, ballast crib height, tamping lift height, and ballast particle characteristics all have a significant influence on the lateral tie strength of clean ballast. The results both emphasize the importance of considering multiple parameters when assessing track buckling risk and verifies the good practice of having both full ballast shoulders and crib heights for resisting lateral and longitudinal movements. TTCI plans to incorporate these parameters into mathematical models that predict the lateral tie strength based on measurable tie and ballast condition parameters, holistic track buckling prediction models, and risk-based rail neutral temperature (RNT) management recommendations.
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Douglas, S. Caleb, and Tyrel G. Wilson. "Integrated Emergency Construction and Engineering Response to 2013 Colorado Storm Damage." In 2015 Joint Rail Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/jrc2015-5686.

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Union Pacific Railroad’s Moffat Tunnel Subdivision, west of Denver, Colorado, was significantly impacted by an approximately 500 to 1,000 year storm event that occurred between September 9, 2013 and September 13, 2013. As a result of this historic event, washouts, earth slides, and debris flows severely impacted track infrastructure by eroding track embankments, destabilizing surrounding native slopes, and overwhelming stormwater infrastructure. Emergency response activities performed to restore track operations at Milepost (MP) 25.65 and MP 22.86 required the integration of civil, hydraulic, environmental and geotechnical engineering disciplines into emergency response and construction management efforts. Additionally, support from UPRR’s Real Estate Division was required when addressing private ownership and site access issues. The following text summarizes how coordinated efforts between various groups worked together in a pressure setting to restore rail service. The most significant damage occurred at MP 25.65 in a mountainous slot canyon between two tunnels accessible only by rail and consisted of a washout, approximately 200 feet (61 m) in length with a depth of 100 feet (30 m). MP 22.86 experienced slides on both sides of the track resulting in an unstable and near vertical track embankment which required significant fill and rock armoring. In addition to the embankment failures at MP 22.86, flood flows scoured around the underlying creek culvert, further threatening the geotechnical stability of the track embankment. The storm event highlighted the vulnerability of fill sections, where original construction used trestles. The repair plan engineered for MP 25.65 was developed to restore the lost embankment fill to near pre-flood conditions while limiting environmental impacts in order to minimize regulatory permitting requirements. Fill replacement performed during the initial emergency response was completed within 22 days, notwithstanding site remoteness and difficult access. Repair of the embankment required the placement of approximately 90,000 cubic yards (68,800 cubic meters) of fill and installation of four 48-inch (122-cm) culverts. Repair of embankment sloughing and scour damage at MP 22.86 was accomplished without the need for environmental permits by working from above the ordinary high water mark, using a “one track in – one track out” approach while restoring infrastructure to pre-flood conditions. A new headwall to address flow around the culvert inlet received expedited permit authorization from the U.S. Army Corps of Engineers by limiting the construction footprint through implementation of best management practices and minimizing placement of fill below the ordinary high water mark. Service interruptions, such as those at MP 22.86 and MP 25.65, require sound engineering practices that can be quickly and efficiently implemented during emergency response situations that often occur in less than ideal working environments. Track outages not only impact the efficiency of a railroad’s operating network, but also impact interstate and global commerce as transportation of goods are hindered. The need to have a team of experienced engineering and construction professionals responding to natural disasters was demonstrated by this storm event.
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Lutfi, Andhika, Hutahaean Ray Henry Jimmy, Saputra Rangga, Saptawirawan I Gede Suryana, Nurmida Arrofi, and Haryakusuma Kresna Prabu. "Offshore Mahakam Architecture Optimization and Cost Reduction with Tapered String for Combined Gravel Pack and Tubingless Completion in One Section." In SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210745-ms.

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Abstract Offshore Mahakam Field development has reached a mature level. With almost 400 wells occupy all platforms fully. Finding target for new wells with adequate reserves to pass the economic cut-off limit has been a challenging task. Multiple reservoirs for a re-entry (side-track) from existing well in Offshore Mahakam field become a base case by targeting both shallow reservoirs with sand control requirement and deeper reservoirs at consolidated sandstone. Conventionally, side-track wells are drilled in two separated section to allow Gravel Pack completion inside 9-5/8" casing at the upper part for shallow reservoirs and then drill deeper section for tubingless completion with 4-1/2" liner. Completing these marginal wells using current conventional well architecture makes these wells uneconomical. Answering the challenge and align to cost culture program, Pertamina Hulu Mahakam launched a collaborative project aiming for cost-effective wells against well reserves. Extended drilling envelope was introduced as the outcome of well architecture simplification process. Both shallow and deep reservoirs are drilled in one long open hole section then cased and cemented with single string tapered casing and tubing. Considering sand risk production, unconsolidated shallow gas reservoirs are accommodated by gravel pack completion in the upper part. This new type of architecture has challenge related to hole stability for long open hole management and cementing strategy to ensure high quality cement sheath behind tapered string tapered casing and tubing. Then special equipment design and series of field test are performed prior to first application. This paper illustrates development this new architecture and success application result in Mahakam Offshore Field.
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Piaggio, B., V. Garofano, S. Donnarumma, A. Alessandri, RR Negenborn, and M. Martelli. "Follow-the-Leader Control Strategy for Azimuth Propulsion System on Surface Vessels." In International Ship Control Systems Symposium. IMarEST, 2020. http://dx.doi.org/10.24868/issn.2631-8741.2020.004.

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This paper presents an effective autonomous follow-the-leader strategy for Azimuthal Stern Drive vessels. The control logic has been investigated from a theoretical point of view. A line-of-sight algorithm is exploited to ensure yaw-check ability, while a speed-check feature is implemented to track the velocity of the target along the path. For this purpose, a linearised manoeuvrability model for azimuthal drive surface vessels is presented. A model-based control synthesis is proposed to ensure the stability of the closed-loop system and robust PID controllers are designed by using Linear Matrix Inequalities technique. The control strategy has been successively validated in two steps, initially by using simulation techniques, and then experimentally using an outdoor scenario with model scale tugs. The path planning, navigation, guidance and control modules are studied, detailed, and digitally implemented on-board of the model scale tugs. The models are supplied with GNSS+INS navigation system. Low-level management and control of Azimuthals angles and shaft revolutions is implemented on-board. High-level decentralised path planning, guidance, and control sequence evaluation are dealt with at a remote ground station. In particular, the presented follow-the-leader strategy meets the most generic needs of platooning convoys, and, in the specific instance, of Escort convoy tugs. The operative profile of the latter concerns long-lasting and routine chases with the continuous demand of tuning heading and speed to track the target vessels, until the rare occurrence of an emergency event. In a realistic scenario, the proposed control system would be beneficial for the tug master’s lucidity and alertness, while reducing avoidable risks. At the end of the paper, the results of the experimental campaign are shown to demonstrate the effectiveness of the proposed control logic.
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Mokhlis, Mohamad Mustaqim, Nurdini Alya Hazali, Muhammad Firdaus Hassan, Mohd Hafiz Hashim, Afzan Nizam Jamaludin, Roland Hermann, Roberto Fuenmayor, et al. "Connecting Data, Model and Process to Streamline and Enhance Single-Point Production Well Test Validation." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207270-ms.

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Abstract In this paper we will present a process streamlined for well-test validation that involves data integration between different database systems, incorporated with well models, and how the process can leverage real-time data to present a full scope of well-test analysis to enhance the capability for assessing well-test performance. The workflow process demonstrates an intuitive and effective way for analyzing and validating a production well test via an interactive digital visualization. This approach has elevated the quality and integrity of the well-test data, as well as improved the process cycle efficiency that complements the field surveillance engineers to keep track of well-test compliance guidelines through efficient well-test tracking in the digital interface. The workflow process involves five primary steps, which all are conducted via a digital platform: Well Test Compliance: Planning and executing the well test Data management and integration Well Test Analysis and Validation: Verification of the well test through historical trending, stability period checks, and well model analysis Model validation: Correcting the well test and calibrating the well model before finalizing the validity of the well test Well Test Re-testing: Submitting the rejected well test for retesting and final step Integrating with corporate database system for production allocation This business process brings improvement to the quality of the well test, which subsequently lifts the petroleum engineers’ confidence level to analyze well performance and deliver accurate well-production forecasting. A well-test validation workflow in a digital ecosystem helps to streamline the flow of data and system integration, as well as the way engineers assess and validate well-test data, which results in minimizing errors and increases overall work efficiency.
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Sill, Justin, and Beshah Ayalew. "Cascaded Predictive Control of Tire Force Saturation Levels for Vehicle Stability." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34661.

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This paper proposes and demonstrates a cascaded predictive control strategy that quantifies and uses longitudinal and lateral tire force saturation for directional stability control of road vehicles. Saturation is explicitly defined and computed as the deficiency of a tire to generate a linearly increasing force in either the lateral or longitudinal direction. The optimal management of lateral saturation levels is set as the objective for an upper level controller, while the optimal management of longitudinal saturation among all tires is set as the objective for a lower level driving/braking torque distribution controller. This cascaded predictive scheme exploits prevailing time scale separations between the lateral vehicle dynamics and the tire/wheel dynamics. The performance of the approach is illustrated using simulations of a medium-duty truck undergoing a transient handling maneuver.
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7

Sill, Justin, and Beshah Ayalew. "Vehicle Stability Control Through Predictive and Optimal Tire Saturation Management." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71182.

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This paper presents a predictive vehicle stability control (VSC) strategy that distributes the drive/braking torques to each wheel of the vehicle based on the optimal exploitation of the available traction capability for each tire. To this end, tire saturation levels are defined as the deficiency of a tire to generate a force that linearly increases with the relevant slip quantities. These saturation levels are then used to set up an optimization objective for a torque distribution problem within a novel cascade control structure that exploits the natural time scale separation of the slower lateral handling dynamics of the vehicle from the relatively faster rotational dynamics of the wheel/tire. The envisaged application of the proposed vehicle stability strategy is for vehicles with advanced and emerging pure electric, hybrid electric or hydraulic hybrid power trains featuring independent wheel drives. The developed predictive control strategy is evaluated for, a two-axle truck featuring such an independent drive system and subjected to a transient handling maneuver.
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Mohaghegh, Mohammad Reza, Shohel Mahmud, and Syeda Tasnim. "Effect of Geometric Configurations on the Thermal Performance Of Encapsulated PCMs." In ASME 2021 Heat Transfer Summer Conference collocated with the ASME 2021 15th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/ht2021-63181.

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Abstract The integration of thermal energy storage (TES) systems with Phase Change Materials (PCMs) is a promising technique not only for storing thermal energy, also for thermal management applications. Encapsulation is a safe and efficient integration technique of using PCM, which has various advantages such as PCM protection, mechanical stability, leakage prevention and, diversified shapes and sizes. The thermal performance of these systems is heavily dependent on the form and geometry of the encapsulating PCM. Various literature has investigated PCM encapsulation for different applications; however, they were limited to just a few common geometries, i.e., rectangular, spherical, and cylindrical. The present research is aimed to investigate the effect of shape/geometry on the thermal performance of encapsulated PCMs and visualize the PCM melting process to a further improvement in the thermal performance of TES systems for different applications. For this purpose, transient heat transfer and the melting process of the same volume of PCM encapsulated in four different geometrical configurations of the capsules, including the common encapsulation shapes such as spherical, cubical, cylindrical, and conical shape as less studied and new proposed shape, are studied. A mathematical model is developed and numerically solved to study the energy transport processes inside the enclosures. The melting process is visualized numerically to track the solid-liquid interface during the phase change. Moreover, the heat transfer characteristics such as melting fraction and energy stored in the system and their temporal variation during the phase change process are determined. A comparison of the four cases in terms of melting rate and energy storage is carried out, as well. The results show that the conical capsule exhibits the best thermal performance with a total melting time of 72 minutes. While the cubical capsule requires 111 minutes to complete the melting process.
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Lotfi, N., H. Zomorodi, and R. G. Landers. "Thermal Management and Voltage Stabilization in Air-Forced Open-Cathode Fuel Cells." In ASME 2015 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/dscc2015-9920.

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Temperature control is undoubtedly one of the important challenges in open-cathode fuel cell systems. Due to cost considerations, it is traditionally achieved by constant-speed operation of the fans. In this paper, a state feedback temperature controller, combined with a Kalman filter to mitigate the noisy temperature measurements is designed and implemented. The controller-filter set facilitates robust thermal management with respect to model uncertainties and measurement noise. The proposed temperature control not only manages to track the fuel cell temperature reference, it can also be used to stabilize the output voltage. Voltage regulation is of great importance for open-cathode fuel cells as it guarantees a predictable and fixed fuel cell output voltage for given current values in spite of internal and external disturbances. The controllers were implemented experimentally and the results show promising performances in regulating the reference temperature and voltage despite model uncertainties and disturbances.
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Xiang, D., R. Mohan, J. Marrelli, S. Wang, and O. Shoham. "A Modular Differential Dielectric Sensor (DDS) for Use in Multiphase Separation, Process Measurement and Control—Part I: Analytical Modeling." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-80214.

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Oil industry increasingly demands accurate and stable continuous measurement of the percent water in crude oil production streams (watercut) over the entire 0 to 100% range. High accuracy and stability are also required for surface measurement to support niche applications such as control of processes which remove trace amounts of oil and particulates from produced water prior to disposal. Differential Dielectric Sensors (DDS) have been developed by Chevron as independent tools connected with multiphase meters for process management and composition measurement. This paper is a two-part paper — the first part (current paper) deals with analytical modeling of the DDS (configured in a single ended mode) and the second part discusses the results of key experimental investigations obtained in a differential mode. The main objective of this paper is to develop appropriate mathematical models for the DDS which characterize the microwave attenuation and phase shift as a function of fluid properties, sensor geometry and operational conditions. Forward models based on the analysis of microwave propagation have been developed for sensors configured as circular waveguides. Results of this project will be useful for optimization and refinement of multiphase meters.
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