{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T22:12:03Z","timestamp":1782339123080,"version":"3.54.5"},"reference-count":25,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2025,6,10]],"date-time":"2025-06-10T00:00:00Z","timestamp":1749513600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000266","name":"Engineering and Physical Sciences Research Council","doi-asserted-by":"publisher","award":["EP\/S016813\/1"],"award-info":[{"award-number":["EP\/S016813\/1"]}],"id":[{"id":"10.13039\/501100000266","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Robotics"],"abstract":"<jats:p>The inspection of sewer pipes in the UK is costly, and if not inspected regularly, they are costly and disruptive to repair. This paper presents the Mega-Joey, a novel miniature, tether-less robot platform that is capable of autonomously navigating and assessing confined spaces, such as small-diameter underground pipelines. This paper also discusses a novel decentralized event-based-broadcasting autonomous exploration algorithm designed for exploring such pipe networks collaboratively. The designed robot is able to operate in pipes with an inclination of up to 20 degrees in dry and up to 10 degrees in wet conditions. A team of Mega-Joeys was used to explore a test network using the proposed algorithm. The experimental results show that the team of robots was able to explore a 3850 mm long test network within a faster period (36% faster) and in a more energy-efficient manner (approximately 54% more efficient) than a single robot could achieve.<\/jats:p>","DOI":"10.3390\/robotics14060080","type":"journal-article","created":{"date-parts":[[2025,6,10]],"date-time":"2025-06-10T12:53:16Z","timestamp":1749559996000},"page":"80","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Autonomous, Collaborative, and Confined Infrastructure Assessment with Purpose-Built Mega-Joey Robots"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7892-2887","authenticated-orcid":false,"given":"Hitesh","family":"Bhardwaj","sequence":"first","affiliation":[{"name":"Institute of Design, Robotics and Manufacturing, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8363-349X","authenticated-orcid":false,"given":"Nabil","family":"Shaukat","sequence":"additional","affiliation":[{"name":"Institute of Design, Robotics and Manufacturing, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3175-3510","authenticated-orcid":false,"given":"Andrew","family":"Barber","sequence":"additional","affiliation":[{"name":"Institute of Design, Robotics and Manufacturing, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7580-5677","authenticated-orcid":false,"given":"Andy","family":"Blight","sequence":"additional","affiliation":[{"name":"Institute of Design, Robotics and Manufacturing, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4156-0955","authenticated-orcid":false,"given":"George","family":"Jackson-Mills","sequence":"additional","affiliation":[{"name":"Institute of Design, Robotics and Manufacturing, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrew","family":"Pickering","sequence":"additional","affiliation":[{"name":"Institute of Design, Robotics and Manufacturing, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-3892-0298","authenticated-orcid":false,"given":"Manman","family":"Yang","sequence":"additional","affiliation":[{"name":"Institute of Design, Robotics and Manufacturing, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-7526-7033","authenticated-orcid":false,"given":"Muhammad Azam","family":"Mohd Sharif","sequence":"additional","affiliation":[{"name":"Institute of Design, Robotics and Manufacturing, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4023-3322","authenticated-orcid":false,"given":"Linyan","family":"Han","sequence":"additional","affiliation":[{"name":"Institute of Design, Robotics and Manufacturing, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4326-0323","authenticated-orcid":false,"given":"Songyan","family":"Xin","sequence":"additional","affiliation":[{"name":"Institute of Design, Robotics and Manufacturing, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert","family":"Richardson","sequence":"additional","affiliation":[{"name":"Institute of Design, Robotics and Manufacturing, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,6,10]]},"reference":[{"key":"ref_1","unstructured":"Department for International Trade, U.K (2024, September 26). Water and Treated Water, Available online: https:\/\/www.gov.uk\/government\/publications\/water-and-treated-water\/water-and-treated-water."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"140173","DOI":"10.1109\/ACCESS.2021.3115981","article-title":"Simultaneous localization and mapping for inspection robots in water and sewer pipe networks: A review","volume":"9","author":"Aitken","year":"2021","journal-title":"IEEE Access"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"103061","DOI":"10.1016\/j.autcon.2019.103061","article-title":"A Survey on Image-Based Automation of CCTV and SSET Sewer Inspections","volume":"111","author":"Haurum","year":"2020","journal-title":"Autom. Constr."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"192","DOI":"10.1016\/j.psep.2020.09.009","article-title":"Recent advances in sensing and assessment of corrosion in sewage pipelines","volume":"147","author":"Foorginezhad","year":"2021","journal-title":"Process Saf. Environ. Prot."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"491","DOI":"10.1002\/rob.20347","article-title":"Robotic devices for water main in-pipe inspection: A survey","volume":"27","author":"Garthwaite","year":"2010","journal-title":"J. Field Robot."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1109\/JSEN.2002.1000245","article-title":"State of the art in sensor technologies for sewer inspection","volume":"2","author":"Duran","year":"2002","journal-title":"IEEE Sens. J."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.measurement.2012.05.032","article-title":"State of the art review of inspection technologies for condition assessment of water pipes","volume":"46","author":"Liu","year":"2013","journal-title":"Measurement"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Mills, G.H., Jackson, A.E., and Richardson, R.C. (2017). Advances in the Inspection of Unpiggable Pipelines. Robotics, 6.","DOI":"10.3390\/robotics6040036"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Wu, Y., Mittmann, E., Winston, C., and Youcef-Toumi, K. (2019, January 10\u201312). A Practical Minimalism Approach to In-pipe Robot Localization. Proceedings of the 2019 American Control Conference (ACC), Philadelphia, PA, USA.","DOI":"10.23919\/ACC.2019.8814648"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Parlak, B.O., and Yavasoglu, H.A. (2023). A Comprehensive Analysis of In-Line Inspection Tools and Technologies for Steel Oil and Gas Pipelines. Sustainability, 15.","DOI":"10.3390\/su15032783"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Ren, T., Zhang, Y., Li, Y., Chen, Y., and Liu, Q. (2019). Driving Mechanisms, Motion, and Mechanics of Screw Drive In-Pipe Robots: A Review. Appl. Sci., 9.","DOI":"10.3390\/app9122514"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"315","DOI":"10.1016\/j.mechatronics.2008.05.007","article-title":"One pneumatic line based inchworm-like micro robot for half-inch pipe inspection","volume":"18","author":"Lim","year":"2008","journal-title":"Mechatronics"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Selvarajan, A., Kumar, A., Sethu, D., and bin Ramlan, M.A. (2019, January 15\u201317). Design and Development of a Snake-Robot for Pipeline Inspection. Proceedings of the 2019 IEEE Student Conference on Research and Development (SCOReD), Bandar Seri Iskandar, Malaysia.","DOI":"10.1109\/SCORED.2019.8896254"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1425","DOI":"10.1016\/j.matpr.2021.08.335","article-title":"A review on various types of in-pipe inspection robot","volume":"50","author":"Verma","year":"2022","journal-title":"Mater. Today Proc."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Jeon, K.W., Jung, E.J., Bae, J.H., Park, S.H., Kim, J.J., Chung, G., Chung, H.J., and Yi, H. (2024). Development of an In-Pipe Inspection Robot for Large-Diameter Water Pipes. Sensors, 24.","DOI":"10.3390\/s24113470"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1016\/S0921-8890(97)00011-0","article-title":"Autonomous sewer inspection with a wheeled, multiarticulated robot","volume":"21","author":"Cordes","year":"1997","journal-title":"Robot. Auton. Syst."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Kim, J.H., Sharma, G., Boudriga, N., and Iyengar, S.S. (2010, January 5\u20139). SPAMMS: A sensor-based pipeline autonomous monitoring and maintenance system. Proceedings of the 2010 Second International Conference on COMmunication Systems and NETworks (COMSNETS 2010), Bangalore, India.","DOI":"10.1109\/COMSNETS.2010.5432015"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Kim, J., Lim, J.S., Friedman, J., Lee, U., Vieira, L., Rosso, D., Gerla, M., and Srivastava, M.B. (2009, January 22\u201326). SewerSnort: A drifting sensor for in-situ sewer gas monitoring. Proceedings of the 2009 6th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks, Rome, Italy.","DOI":"10.1109\/SAHCN.2009.5168971"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Nassiraei, A.A., Kawamura, Y., Ahrary, A., Mikuriya, Y., and Ishii, K. (2007, January 10\u201314). Concept and design of A fully autonomous sewer pipe inspection mobile robot \u201cKANTARO\u201d. Proceedings of the Proceedings 2007 IEEE International Conference on Robotics and Automation, Rome, Italy.","DOI":"10.1109\/ROBOT.2007.363777"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Nguyen, T., Blight, A., Pickering, A., Jackson-Mills, G., Barber, A.R., Boyle, J.H., Richardson, R., Dogar, M., and Cohen, N. (2022). Autonomous control for miniaturized mobile robots in unknown pipe networks. Front. Robot. AI, 9.","DOI":"10.3389\/frobt.2022.997415"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"162035","DOI":"10.1109\/ACCESS.2021.3130233","article-title":"Localization, mapping, navigation, and inspection methods in in-pipe robots: A review","volume":"9","author":"Kazeminasab","year":"2021","journal-title":"IEEE Access"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"951","DOI":"10.3390\/iot5040043","article-title":"A Machine-Learning-Based and IoT-Enabled Robot Swarm System for Pipeline Crack Detection","volume":"5","author":"Kandil","year":"2024","journal-title":"IoT"},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Wu, T., Miao, X., Zhao, H., Li, L., and Li, S. (2024). Vibration Characteristics and Structural Optimization of Pipeline Intelligent Plugging Robot under Turbulent Flow Field Excitation. Appl. Sci., 14.","DOI":"10.3390\/app14146213"},{"key":"ref_24","unstructured":"(2025, March 05). National House-Building Council (NHBC), U.K. 5.3.7 Design to Avoid Damage and Blockages. Part of NHBC Standards, Chapter 5.3 Drainage Below Ground. Available online: https:\/\/nhbc-standards.co.uk\/5-substructure-ground-floors-drainage-and-basements\/5-3-drainage-below-ground\/5-3-7-design-to-avoid-damage-and-blockages\/."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"163","DOI":"10.2166\/wst.1998.0040","article-title":"A laboratory study of the erosion and transport of cohesive-like sediment mixtures in sewers","volume":"37","author":"Tait","year":"1998","journal-title":"Water Sci. 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