172 research outputs found

    Low-cost device for fault diagnosis in bearings based on the Hilbert-Huang transform

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    In order to monitor the condition of machinery complex industrial environments, high-cost equipment is required for signal acquisition and processing. However, low-cost sensor nodes with high processing capability are a potential solution to improve diagnostic systems. This paper presents a low-cost device for fault diagnosis based on the vibration response in rotating machines with the implementation of the Hilbert-Huang transform (HHT) analysis to extract the main characteristics of the signal. HHT, used to analyze non-linear and non-stationary signals, incorporates an Empirical Mode Decomposition (EMD) process. Processing is carried out in an embedded system to acquire vibration response data and extract signal characteristics that allow condition monitoring. As a result of local processing in the vibratory measurement device in an embedded system, the signal decomposition is performed, enabling the detection of the characteristic failure in the bearing ring and transmitting the alarm to a hub. This eliminates the need for a central diagnostic system and reduces the total cost of the system.This work has been carried out within the framework of the Looming Factory project, reference 001-P-001643, of the RIS3CAT program of the Generalitat de Catalunya. This research has been made possible thanks to the support of the MCIA Electronic Drives and Industrial Applications Research Group of the Universitat Politècnica de Catalunya and its collaborators.Peer ReviewedPostprint (published version

    Vibration Monitoring: Gearbox identification and faults detection

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    L'abstract è presente nell'allegato / the abstract is in the attachmen

    12th International Conference on Vibrations in Rotating Machinery

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    Since 1976, the Vibrations in Rotating Machinery conferences have successfully brought industry and academia together to advance state-of-the-art research in dynamics of rotating machinery. 12th International Conference on Vibrations in Rotating Machinery contains contributions presented at the 12th edition of the conference, from industrial and academic experts from different countries. The book discusses the challenges in rotor-dynamics, rub, whirl, instability and more. The topics addressed include: - Active, smart vibration control - Rotor balancing, dynamics, and smart rotors - Bearings and seals - Noise vibration and harshness - Active and passive damping - Applications: wind turbines, steam turbines, gas turbines, compressors - Joints and couplings - Challenging performance boundaries of rotating machines - High power density machines - Electrical machines for aerospace - Management of extreme events - Active machines - Electric supercharging - Blades and bladed assemblies (forced response, flutter, mistuning) - Fault detection and condition monitoring - Rub, whirl and instability - Torsional vibration Providing the latest research and useful guidance, 12th International Conference on Vibrations in Rotating Machinery aims at those from industry or academia that are involved in transport, power, process, medical engineering, manufacturing or construction

    12th International Conference on Vibrations in Rotating Machinery

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    Since 1976, the Vibrations in Rotating Machinery conferences have successfully brought industry and academia together to advance state-of-the-art research in dynamics of rotating machinery. 12th International Conference on Vibrations in Rotating Machinery contains contributions presented at the 12th edition of the conference, from industrial and academic experts from different countries. The book discusses the challenges in rotor-dynamics, rub, whirl, instability and more. The topics addressed include: - Active, smart vibration control - Rotor balancing, dynamics, and smart rotors - Bearings and seals - Noise vibration and harshness - Active and passive damping - Applications: wind turbines, steam turbines, gas turbines, compressors - Joints and couplings - Challenging performance boundaries of rotating machines - High power density machines - Electrical machines for aerospace - Management of extreme events - Active machines - Electric supercharging - Blades and bladed assemblies (forced response, flutter, mistuning) - Fault detection and condition monitoring - Rub, whirl and instability - Torsional vibration Providing the latest research and useful guidance, 12th International Conference on Vibrations in Rotating Machinery aims at those from industry or academia that are involved in transport, power, process, medical engineering, manufacturing or construction

    Condition monitoring of rotating machinery - vibration analysis

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    The aim of condition monitoring is to detect defective machine components and allow timely repair before failure and secondary damage occurs. This project, in particular, covers the condition monitoring techniques applicable to rotating machinery and vibration analysis. Vibration analysis is a specialised role and equipment owners often have a limited under- standing of it. Practicing technicians also benefit from better understanding fundamental principles and ongoing training. Key to improving outcomes of CM programs is improving knowledge and understanding. Utilising overall project specifications, a schedule, flow and Gantt charts, decision trees, listing activities with diagrams and milestones ensured the orderly development of the project. Researching condition monitoring practices and standards applicable to rotating machinery led to developing required outcomes, software specifications and user requirements for a virtual training package prior to writing the Matlab program. Development of the vibration training program in line with ISO18436-2 requirements and industry recognised practices for personnel conducting and utilising vibration condition monitoring resulted in a program that is easy to use, familiarising the user with fundamental concepts and readily detectable faults. The key aspect of the project, the development of a training and awareness tool based on industry practices and expectations, is displayed in the training program. It is a tool that can help technicians and plant owners better understand and implement vibration condition monitoring and improve outcomes thus reducing costly unplanned plant outages

    NASA SBIR abstracts of 1991 phase 1 projects

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    The objectives of 301 projects placed under contract by the Small Business Innovation Research (SBIR) program of the National Aeronautics and Space Administration (NASA) are described. These projects were selected competitively from among proposals submitted to NASA in response to the 1991 SBIR Program Solicitation. The basic document consists of edited, non-proprietary abstracts of the winning proposals submitted by small businesses. The abstracts are presented under the 15 technical topics within which Phase 1 proposals were solicited. Each project was assigned a sequential identifying number from 001 to 301, in order of its appearance in the body of the report. Appendixes to provide additional information about the SBIR program and permit cross-reference of the 1991 Phase 1 projects by company name, location by state, principal investigator, NASA Field Center responsible for management of each project, and NASA contract number are included

    The perceptual flow of phonetic feature processing

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