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2 results, page 1 of 1

Diagnosis of friction on an unbalanced rotor by phase-shift empirical mode decomposition integration and recurrence plot

Ignacio Torres Contreras Juan Carlos Jauregui JOSE SALVADOR ECHEVERRIA VILLAGOMEZ Juan Benitez-Rangel (2021)

The friction and imbalance of components in rotating machines are some of the most recurrent failures that significantly increase vibration levels, thus affecting the reliability of the devices, the shelf life of its elements, and the quality of the product. There are many publications related to the different techniques for the diagnosis of friction and imbalance. In this paper, an alternative and new phase-shift empirical mode decomposition integration (PSEMDI) method is proposed to transform the acceleration into its velocity and displacement in order to construct the phase plane and recurrence plot (RP) and analyze the friction. The focus of PSEMDI and RP is to analyze nonlinear failures in mechanical systems. In machinery fault diagnosis, the main reason for using RP is to solve the integration of acceleration, and this can be achieved by phase-shifting the intrinsic mode function (IMF) with the empirical mode decomposition (EMD). Although the highest IMFs contain some frequencies, most of them have very few; thus, by applying the phase shift identity, the integration can be carried out maintaining the nonlinearities. The proposed method is compared with Simpson’s integration and detrending with the EMD method (here referred to as SDEMDI). The experimental RP results show that the proposed method gives significantly more information about the velocity and displacement spectra and it is more stable and proportional than the SDEMDI method. The results of the proposed integration method are compared with vibration measurements obtained with an interferometer.

También es autora Stephanie Camacho Martínez (UAQ)

Author contributions: Conceptualization, validation, formal analysis, investigation, and writing original draft preparation, I.T.-C.; methodology, supervision and validation J.C.J.-C.; visualization, technical and writing editing reviewers, S.E.-V. and J.P.B.-R.; software, S.C.-M. All authors have read and agreed to the published version of the manuscript.

Funding: This research received no external funding.

Institutional Review Board Statement: Not applicable.

Informed consent Statement: Not applicable.

Data Availability Statement: Not applicable.

Conflicts of Interest: The authors declare no conflict of interest.

Article

Rotor unbalance Friction Recurrence plot Predictive maintenance Nonlinear vibration EMD INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA E INGENIERÍA MECÁNICAS DISEÑO DE MÁQUINAS DISEÑO DE MÁQUINAS

Pruebas ultrasónicas de inmersión en UHMWPE para caracterización del desgaste en prótesis articulares

WILLIAM ANDRES URQUIJO LUENGAS (2018)

El desgaste en componentes de UHMWPE de prótesis articulares, ha promovido el aumento en el número de intervenciones quirúrgicas de revisión en pacientes con este tipo de implantes. Actualmente, no se conoce de una técnica específica para el diagnóstico del desgaste en estos componentes, de forma no invasiva. Por lo cual, es necesario desarrollar las bases preliminares para generar una metodología no invasiva basada en propagación de ondas ultrasónicas que permita identificar el desgaste en estos componentes protésicos. Este trabajo presenta la evaluación no destructiva de probetas de UHMWPE mediante inspección ultrasónica. Inicialmente, se identifican los cambios de profundidad en la superficie del material, y en una segunda etapa, el cambio por desgaste controlado. Este último se aplica mediante la prueba de desgaste (Pin on Disk). Los resultados de la inspección son analizados para determinar la capacidad de la técnica para detectar variaciones en la superficie del material a causa de un proceso de desgaste por fricción. Finalmente, se determina la factibilidad de la implementación de una metodología no invasiva de este tipo, orientada al diagnóstico del desgaste en componentes de prótesis articulares en personas con esta clase de implantes.

The wear in UHMWPE components of joint prostheses has promoted an increase in the number of revision surgeries in patients with this type of implants. Currently there is no specific technique known for the diagnosis of wear in these components in a non-invasive form, therefore it is necessary to develop the preliminary bases to generate a non-invasive methodology based on ultrasonic wave propagation to identify the wear in these prosthetic components. This thesis presents the non-destructive evaluation of UHMWPE specimens by ultrasonic inspection. Initially the changes of depth in the surface of the material are identified and in a second stage the change by controlled wear. The latter is applied by means of the wear test (Pin on Disk). Inspection results are analyzed to determine the ability of the technique to detect variations in the surface of the material due to a friction wear process.

Finally to determine the feasibility of implementing a non-invasive methodology of this type oriented to the diagnosis of wear in joint prosthesis components in people with this type of implants.

Master thesis

CIS- Maestría en Ingeniería Mecánica INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA MÉDICA UHMWPE (Ultra High Weight Molecular Polyethylene - Polietileno de Alto Peso Molecular) Pruebas ultrasónicas de inmersión Prótesis articulares – Desgaste por fricción Prueba de desgaste (Pin on Disk) Implantes quirúrgicos Artroplastia Ultrasonic immersion tests Articular prostheses - Friction wear Wear test (Pin on Disk) Surgical implants Arthroplasty