[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-227764-en":3,"doc-seo-227764-105":30,"detail-sidebar-cat-0-en-105":97},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":20,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},227764,962085570644,"Melati","https://ap-avatar.wpscdn.com/davatar_994ba38a5ba835b3df7d355c54d3ed8d",8,"Research & Report","A Comparative Study of Modified Passenger Railway Vehicle Trucks - Doctor of Philosophy Thesis","A comparative research thesis examines modified passenger railway vehicle truck designs to enhance both high-speed dynamic stability and curving/steering performance. Conventional high-speed trucks rely on stiff primary suspension elements, but wheelset misalignment in curves degrades curving behaviour, increases wheel and rail wear, and raises maintenance costs. The work evaluates C, R, CD, and USD truck configurations, including unsymmetric suspension and yaw damper effects, and compares an unsymmetric wheelset variant (UW). Non-linear curving results and multi-body simulation validation using NUCARS show USD achieves superior curving performance up to 12 degrees while maintaining near-perfect steering.","A COMPARATIVE STUDY OF MODIFIED PASSENGER RAILWAYVEHICLE TRUCKS  \nSrinivasan Narayanaswamy  \nA thesis inThe DepartmentofMechanical Engineering  \nSubmitted in Partial Fulfillment of the Requirementsfor the Degree of Doctor of Philosophy atConcordia UniversityMontreal,Quebec,Canada  \nDecember,1998  \nThe author has granted a non-exclusive licence allowing theNational Library of Canada toreproduce,loan,distribute or sellcopies of this thesis in microform,paper or electronic formats.  \nThe author retains ownership of thecopyright in this thesis.Neither thethesis nor substantial extracts from itmay be printed or otherwisereproduced without the author'spermission.  \nAcquisitions andBibliographic Services  \n395 Wellington Street  \nOttawa ON K1A ON4  \nCanada  \nanada  \nBibliotheque nationaledu Canada  \nAcquisitions etservices bibliographiques  \n395,rue Wellington  \nOttawa ON K1A ON4  \nCanada  \n0-612-39026-8  \nYour hile Votre relerence  \nOur fle Notre relerence  \nL'auteur a accordé une licence nonexclusive permettant à la  \nBibliothèque nationale du Canada dereproduire,preter,distribuer ouvendre des copies de cette thèse sousla forme de microfiche/film,dereproduction sur papier ou sur formatélectronique.  \nL'auteur conserve la propriété dudroit d'auteur qui protege cette these.Ni la thèse ni des extraits substantielsde celle-ci ne doivent etre imprimésou autrement reproduits sans sonautorisation.  \n# Abstract\n\nA Comparative Study of Modified Passenger Railway Vehicle Trucks  \nSrinivasan Narayanaswamy,Ph.D.Concordia University,1998  \nThere has been renewed interest in rail transportation driven by the need foralternatives to congested highways and environmental concerns.The conventional railwaytruck designed for operation at high speed of approximately 200 km/hr makes use of stiffprimary suspension elements to provide good dynamic stability.The curving performanceof such a vehicle is poor because of wheelset misalignment in curves resulting in increasedwheel and rail wear.This increases the maintenance cost.The wheelset misalignment alsoleads to increased lateral forces which raises the potential for derailment due to wheelclimb.One of the aspects of the railway truck design that needs improvement is bettercompatibility between dynamic stability at high speeds and the ability of the vehicle tosteer around curves.  \nIn this thesis,modified truck designs are considered with an objective to improveboth the high speed stability and curving behaviour.The performance of the followingdesigns are compared:(i)Conventional truck(C truck)(ii)Radial truck(R Truck)(iii)Conventional truck with yaw damper(CD truck)and(iv)Unsymmetric Suspension truckwith yaw damper(USD truck).The USD truck has longitudinal asymmetry in thesuspension according to direction of motion i.e.the primary stiffness in the leading axle is  \ndifferent from the trailing axle.Another truck considered for evaluation is theUnsymmetric Wheelset truck (UW truck)in which the trailing axle is an IndependentlyRotating Wheelset(IRW).  \nBy choosing suitable values of primary yaw dampers,it is possible for CD truck andUSD truck to achieve higher critical speed in comparison to C truck and US truck for agiven bending stiffness.The non-linear curving analysis has shown that USD truckachieves better curving performance in comparison to other truck designs on curvaturesup to 12 degrees.Thus it is possible for a properly designed USD truck to achieve nearperfect steering as well as maintain good dynamic stability.  \nValidation of the results from this study has been carried out using the softwareNew and Untried Car Analytic Regime Simulation(NUCARS).NUCARS is a multi-bodydynamic program for railway vehicle design and performance evaluation and is anindustry-wide standard in North America.The analysis of performance using NUCARSalso shows that USD truck has better curving behaviour compared to other truck designsfor curvatures up to 12 degrees.  \n# ACKNOWLEDGMENTS\n\nThe author wishes to acknowledge ","cbCaio8Cce80DZOs","https://ap.wps.com/l/cbCaio8Cce80DZOs","pdf",7314449,1,228,"English","en",105,"# Abstract\n# Acknowledgments\n# List of Figures\n# List of Tables\n# Nomenclature\n# 1.0 Introduction and Literature Review\n## 1.1 Background\n## 1.2 Literature Review\n## 1.3 Research Outline\n## 1.3 Summary\n# 2.0 Modelling Considerations and Simulation Environment\n## 2.1 Introduction\n## 2.2 Wheel/Rail Geometry\n## 2.3 Wheel/Rail Contact Forces\n## 2.4 Gravitational Stiffness Forces\n## 2.5 Conventional Rail Vehicle Model\n## 2.6 Summary\n# 3.0 Lateral Stability Models for Modified Truck Designs\n## 3.1 Introduction\n## 3.2 Radial Trucks\n## 3.3 Unsymmetric Suspension Truck\n## 3.4 Unsymmetric Wheelset Truck\n## 3.5 Conventional Truck with Yaw Damper\n## 3.6 Unsymmetric Suspension Truck with Yaw Damper\n## 3.7 Tangent Track Stability Analysis\n## 3.8 Stability Properties","[{\"question\":\"Why do conventional high-speed railway trucks have poor curving performance?\",\"answer\":\"They experience wheelset misalignment in curves, which increases wheel and rail wear and leads to higher lateral forces that raise the potential for derailment due to wheel climb.\"},{\"question\":\"Which modified truck designs are compared in the thesis?\",\"answer\":\"The study compares a conventional truck (C truck), a radial truck (R truck), a conventional truck with a yaw damper (CD truck), and an unsymmetric suspension truck with a yaw damper (USD truck), plus an unsymmetric wheelset truck (UW truck).\"},{\"question\":\"What simulation tool is used to validate the study results?\",\"answer\":\"Validation is performed using NUCARS, a multi-body dynamic program for railway vehicle design and performance evaluation.\"}]","A Comparative Study of Modified Passenger Railway Vehicle Trucks - Doctor of Philosophy Thesis | PDF",1789014716,575,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":33,"title":13,"keywords":34,"description":14,"schema_data":35,"social_meta":92,"head_meta":94,"extra_data":96,"updated_unix":28},"a-comparative-study-of-modified-passenger-railway-vehicle-trucks-doctor-of-philosophy-thesis","",{"@graph":36,"@context":91},[37,54,74],{"@type":38,"itemListElement":39},"BreadcrumbList",[40,44,48,51],{"item":41,"name":42,"@type":43,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":45,"name":46,"@type":43,"position":47},"https://docshare.wps.com/document/","Document",2,{"item":49,"name":12,"@type":43,"position":50},"https://docshare.wps.com/document/research-report/",3,{"item":52,"name":13,"@type":43,"position":53},"https://docshare.wps.com/document/a-comparative-study-of-modified-passenger-railway-vehicle-trucks-doctor-of-philosophy-thesis/227764/",4,{"url":52,"name":13,"@type":55,"image":56,"author":61,"headline":13,"publisher":63,"fileFormat":66,"inLanguage":23,"description":14,"dateModified":67,"datePublished":68,"encodingFormat":66,"isAccessibleForFree":69,"interactionStatistic":70},"DigitalDocument",{"url":57,"@type":58,"width":59,"height":60},"https://docshare.wps.com/thumbnails/a-comparative-study-of-modified-passenger-railway-vehicle-trucks-doctor-of-philosophy-thesis/227764.png","ImageObject",300,407,{"name":9,"@type":62},"Person",{"url":41,"name":64,"@type":65},"DocShare","Organization","application/pdf","2026-09-11","2026-09-10",true,{"@type":71,"interactionType":72,"userInteractionCount":20},"InteractionCounter",{"@type":73},"ViewAction",{"@type":75,"mainEntity":76},"FAQPage",[77,83,87],{"name":78,"@type":79,"acceptedAnswer":80},"Why do conventional high-speed railway trucks have poor curving performance?","Question",{"text":81,"@type":82},"They experience wheelset misalignment in curves, which increases wheel and rail wear and leads to higher lateral forces that raise the potential for derailment due to wheel climb.","Answer",{"name":84,"@type":79,"acceptedAnswer":85},"Which modified truck designs are compared in the thesis?",{"text":86,"@type":82},"The study compares a conventional truck (C truck), a radial truck (R truck), a conventional truck with a yaw damper (CD truck), and an unsymmetric suspension truck with a yaw damper (USD truck), plus an unsymmetric wheelset truck (UW truck).",{"name":88,"@type":79,"acceptedAnswer":89},"What simulation tool is used to validate the study results?",{"text":90,"@type":82},"Validation is performed using NUCARS, a multi-body dynamic program for railway vehicle design and performance evaluation.","https://schema.org",{"og:url":52,"og:type":93,"og:title":13,"og:site_name":64,"og:description":14},"article",{"robots":95,"canonical":52},"index,follow",{"doc_id":7,"site_id":24},{"code":4,"msg":5,"data":98},[99,103,107,111,116,121,126,129,134,137,141],{"id":20,"doc_module":4,"doc_module_name":46,"category_name":100,"show_sort_weight":101,"slug":102},"Story & Novel",90,"story-novel",{"id":47,"doc_module":4,"doc_module_name":46,"category_name":104,"show_sort_weight":105,"slug":106},"Literature",80,"literature",{"id":53,"doc_module":4,"doc_module_name":46,"category_name":108,"show_sort_weight":109,"slug":110},"Exam",70,"exam",{"id":112,"doc_module":4,"doc_module_name":46,"category_name":113,"show_sort_weight":114,"slug":115},5,"Comic",60,"comic",{"id":117,"doc_module":4,"doc_module_name":46,"category_name":118,"show_sort_weight":119,"slug":120},6,"Technology",50,"technology",{"id":122,"doc_module":4,"doc_module_name":46,"category_name":123,"show_sort_weight":124,"slug":125},7,"Healthcare",40,"healthcare",{"id":11,"doc_module":4,"doc_module_name":46,"category_name":12,"show_sort_weight":127,"slug":128},30,"research-report",{"id":130,"doc_module":4,"doc_module_name":46,"category_name":131,"show_sort_weight":132,"slug":133},9,"Religion & Spirituality",20,"religion-spirituality",{"id":132,"doc_module":4,"doc_module_name":46,"category_name":135,"show_sort_weight":132,"slug":136},"World Cup","world-cup",{"id":138,"doc_module":4,"doc_module_name":46,"category_name":139,"show_sort_weight":138,"slug":140},10,"Lifestyle","lifestyle",{"id":142,"doc_module":4,"doc_module_name":46,"category_name":143,"show_sort_weight":112,"slug":144},19,"General","general"]