[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-127741-en":3,"doc-seo-127741-105":30,"detail-sidebar-cat-0-en-105":92},{"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},127741,962084926284,"Aurora","https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0",8,"Research & Report","DIAGNOSTICS USING MACHINE LEARNING FOR AIR BRAKES IN COMMERCIAL VEHICLES - A Thesis","To safely introduce autonomy for trucks, brake system health must be monitored continuously, because out-of-adjustment push rods and air leakages in commercial air brake systems increase stopping distances and create safety violations. Leakage can arise from small cracks or improperly fitted couplings, raising braking lag and reducing maximum wheel braking torque. Increased push-rod stroke delays brake response and lowers wheel brake torque. Current monitoring relies on labor-intensive manual inspections that poorly quantify degradation, so an onboard diagnostic device is needed to support enforcement, pre-trip checks, and continuous monitoring under FMSCA safety requirements. This thesis develops a multichamber braking model using real-time brake pressure transients to estimate leakage severity and push-rod stroke, validated by experiments and a machine learning model.","DIAGNOSTICS USING MACHINE LEARNING FOR AIR BRAKES IN COMMERCIAL  \nVEHICLES  \nA Thesis  \nby  \nREYSHWANTH GANESHAN  \nSubmitted to the Graduate and Professional School of  \nTexas A&M University  \nin partial fulfillment of the requirements for the degree of MASTER OF SCIENCE  \nChair of Committee, Swaroop Darbha Committee Members, Sivakumar Rathinam  \nShankar P. Bhattacharyya  \nHead of Department, Guillermo Aguilar  \nAugust 2023  \nMajor Subject: Mechanical Engineering  \nCopyright 2023 Reyshwanth Ganeshan  \nABSTRACT  \nTo safely introduce any level of autonomy to trucks, the health of their brake systems needs to be monitored continuously. Out-of-adjustment push rods and leakages in the air brake system are two major reasons for increased braking distances in trucks, and result in safety violations. Air leakages can occur due to small cracks or loose/improperly fit couplings which do not affect the overall braking capacity but contribute greatly to increasing the braking lag and reducing the maximum braking torque at the wheels. Similarly, an increased stroke of push rod leads to a larger delay in brake response and a smaller value of the brake torque at the wheels. Currently, the condition of an air brake system is monitored manually by measuring the push rod offset and by inspecting the couplings and hoses of the system for air leakages. These inspections are highly labor intensive, subjective, time consuming and do not accurately quantify how adversely the braking system is affected. Having an on-board diagnostic device that can monitor the health of air brakes would be crucial in the prevention of road accidents, especially when considering any level of automation and comply with FMSCA safety requirements. The focus of this thesis is to aid the development of such a diagnostic system that facilitates enforcement and pre-trip inspectionsand continuous on-board monitoring of trucks through the development of a model for its multichamber braking system; this model can be used to estimate the severity of leakage and the push rod stroke using real time brake pressure transients. A machine learning model of the air brake system and its experimental corroboration is presented in this thesis.  \nDEDICATION  \nTo my parents P. S. Ganeshan and Malathy Ganeshan, and my sister Shreethigha for their constant  \nlove and support  \nACKNOWLEDGMENTS  \nI would like to thank the committee chair, Dr. Swaroop Darbha for his inputs throughout this project. It was a privilege to work with a professor of such high academic caliber. I would like to thank him for providing me with the rare opportunity to work on a project such as this. His constant encouragement and words of wisdom and compassion kept me motivated. Not only were the experiences I gained from this work highly valuable, they also helped me realize that I wanted  \nto continue my education and pursue a PhD in Mechanical Engineering.  \nCONTRIBUTORS AND FUNDING SOURCES  \nContributors  \nThis work was supported by a thesis committee consisting of Dr. Swaroop Darbha [advisor], Dr. Sivakumar Rathinam of the Department of Mechanical Engineering and Dr. Shankar P. Bhattacharyya of the Department of Electrical and Computer Engineering  \nAll other work conducted for the thesis was completed by the student independently.  \nFunding Sources  \nGraduate study was supported by a fellowship from Texas A&M University and the Texas Transportation Institute (TTI) .  \nNOMENCLATURE  \nIIHS Insurance Institute for Highway Safety  \nFMSCA Federal Motor Carrier Safety Administration  \nDPS Department of Public Safety  \nPsupply Supply Pressure  \nAc Area of the Brake Chamber Diaphragm  \nkspring Spring Constant of the Brake Chamber Return Spring  \nxd Displacement of the Brake Chamber Diaphragm  \nx0 Effective Pre-load length of the spring  \nFpushrod Force applied by the pushrod  \nHP Horsepower  \nDAQ Data Acquisition  \nFCV Flow Control Valve  \nyprediction Output of the model, Leak Velocity Prediction  \nyactual Measured Leak Vel","cbCaigA0Z4NYYVrA","https://ap.wps.com/l/cbCaigA0Z4NYYVrA","pdf",8431528,1,40,"English","en",105,"# ABSTRACT\n# DEDICATION\n# ACKNOWLEDGMENTS\n# CONTRIBUTORS AND FUNDING SOURCES\n# NOMENCLATURE\n# TABLE OF CONTENTS\n## 1. INTRODUCTION\n## 1.1 Background\n## 1.2 Outline of Thesis","[{\"question\":\"Why is continuous monitoring of truck air brake health important for autonomy and safety?\",\"answer\":\"Air brake issues such as out-of-adjustment push rods and air leakages increase braking distances and can cause safety violations. Continuous monitoring helps prevent road accidents and supports compliance with safety requirements.\"},{\"question\":\"How do air leakages and increased push-rod stroke affect braking performance?\",\"answer\":\"Air leakages raise braking lag and reduce the maximum braking torque at the wheels. An increased push-rod stroke causes a delay in brake response and decreases wheel brake torque.\"},{\"question\":\"What approach does the thesis propose for diagnosing brake condition without labor-intensive manual inspection?\",\"answer\":\"The thesis develops a multichamber braking system model and a machine learning model that uses real-time brake pressure transients to estimate leakage severity and push-rod stroke, enabling onboard diagnostics and continuous monitoring.\"}]","DIAGNOSTICS USING MACHINE LEARNING FOR AIR BRAKES IN COMMERCIAL VEHICLES - A Thesis | PDF",1785941353,101,{"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":87,"head_meta":89,"extra_data":91,"updated_unix":28},"diagnostics-using-machine-learning-for-air-brakes-in-commercial-vehicles-a-thesis","",{"@graph":36,"@context":86},[37,54,69],{"@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/diagnostics-using-machine-learning-for-air-brakes-in-commercial-vehicles-a-thesis/127741/",4,{"url":52,"name":13,"@type":55,"author":56,"headline":13,"publisher":58,"fileFormat":61,"inLanguage":23,"description":14,"dateModified":62,"datePublished":63,"encodingFormat":61,"isAccessibleForFree":64,"interactionStatistic":65},"DigitalDocument",{"name":9,"@type":57},"Person",{"url":41,"name":59,"@type":60},"DocShare","Organization","application/pdf","2026-08-23","2026-08-05",true,{"@type":66,"interactionType":67,"userInteractionCount":20},"InteractionCounter",{"@type":68},"ViewAction",{"@type":70,"mainEntity":71},"FAQPage",[72,78,82],{"name":73,"@type":74,"acceptedAnswer":75},"Why is continuous monitoring of truck air brake health important for autonomy and safety?","Question",{"text":76,"@type":77},"Air brake issues such as out-of-adjustment push rods and air leakages increase braking distances and can cause safety violations. Continuous monitoring helps prevent road accidents and supports compliance with safety requirements.","Answer",{"name":79,"@type":74,"acceptedAnswer":80},"How do air leakages and increased push-rod stroke affect braking performance?",{"text":81,"@type":77},"Air leakages raise braking lag and reduce the maximum braking torque at the wheels. An increased push-rod stroke causes a delay in brake response and decreases wheel brake torque.",{"name":83,"@type":74,"acceptedAnswer":84},"What approach does the thesis propose for diagnosing brake condition without labor-intensive manual inspection?",{"text":85,"@type":77},"The thesis develops a multichamber braking system model and a machine learning model that uses real-time brake pressure transients to estimate leakage severity and push-rod stroke, enabling onboard diagnostics and continuous monitoring.","https://schema.org",{"og:url":52,"og:type":88,"og:title":13,"og:site_name":59,"og:description":14},"article",{"robots":90,"canonical":52},"index,follow",{"doc_id":7,"site_id":24},{"code":4,"msg":5,"data":93},[94,98,102,106,111,116,120,123,128,131,135],{"id":20,"doc_module":4,"doc_module_name":46,"category_name":95,"show_sort_weight":96,"slug":97},"Story & Novel",90,"story-novel",{"id":47,"doc_module":4,"doc_module_name":46,"category_name":99,"show_sort_weight":100,"slug":101},"Literature",80,"literature",{"id":53,"doc_module":4,"doc_module_name":46,"category_name":103,"show_sort_weight":104,"slug":105},"Exam",70,"exam",{"id":107,"doc_module":4,"doc_module_name":46,"category_name":108,"show_sort_weight":109,"slug":110},5,"Comic",60,"comic",{"id":112,"doc_module":4,"doc_module_name":46,"category_name":113,"show_sort_weight":114,"slug":115},6,"Technology",50,"technology",{"id":117,"doc_module":4,"doc_module_name":46,"category_name":118,"show_sort_weight":21,"slug":119},7,"Healthcare","healthcare",{"id":11,"doc_module":4,"doc_module_name":46,"category_name":12,"show_sort_weight":121,"slug":122},30,"research-report",{"id":124,"doc_module":4,"doc_module_name":46,"category_name":125,"show_sort_weight":126,"slug":127},9,"Religion & Spirituality",20,"religion-spirituality",{"id":126,"doc_module":4,"doc_module_name":46,"category_name":129,"show_sort_weight":126,"slug":130},"World Cup","world-cup",{"id":132,"doc_module":4,"doc_module_name":46,"category_name":133,"show_sort_weight":132,"slug":134},10,"Lifestyle","lifestyle",{"id":136,"doc_module":4,"doc_module_name":46,"category_name":137,"show_sort_weight":107,"slug":138},19,"General","general"]