Edgar Estupinan

• PhD
• Professor (Full) at University of Tarapacá

This paper describes a comparison of three types of feature sets. The feature sets were intended to classify 13 faults in a centrifugal pump (CP) and 17 valve faults in a reciprocating compressor (RC). The first set comprised 14 non-linear entropy-based features, the second comprised 15 information-based entropy features, and the third comprised 12...

Chile has set itself to achieve Greenhouse Gas emission neutrality, with at least 70% of electricity coming from renewable energy sources by 2050. To this end, institutional and regulatory frameworks have been improved, resulting in significant progress in medium and large-scale projects. However, solar energy production at residential level and it...

The data unavailability of critical machinery is an open issue in the field of condition-based maintenance research. Acquiring signals in all possible health conditions is impractical in most equipment. This lack of data affects the ability to extract informative features to build effective fault detectors; therefore, the development of proposals t...

The lack of faulty condition data reduces the feasibility of supervised learning for fault detection or fault severity discrimination in new manufacturing technologies. To deal with this issue, one-class learning arises for building binary discriminative models using only healthy condition data. However, these models have not been extrapolated to s...

With the popularization of the intelligent manufacturing, much attention has been paid in such intelligent computing methods as deep learning ones for machinery fault diagnosis. Thanks to the development of deep learning models, the interference of the human experience can be greatly reduced, and the fault diagnosis accuracy can also be increased u...

Prognostics and Health Management technologies are useful for early fault detection and optimization of reliability in mechanical systems. Reciprocating compressors units are commonly used in industry for gas pressurization and transportation, and the valves in compressors are considered vulnerable parts susceptible to failure. Then, early detectio...

Spectral regression (SR) is a method of feature extraction that realizes dimension reduction by the least squares method and can avoid eigen-decomposition of dense matrices. However, it only considers the affinity graph and misses the global information. In this paper, a novel feature extraction algorithm, called local and global spectral regressio...

Los cambios y variaciones cada vez más frecuentes en los precios del cobre, dejan de manifiesto, la necesidad de que las empresas mineras sean cada vez más rigurosas en el control de costos de producción, manteniendo su competitividad en el mercado internacional. De esta manera, el uso e implementación de nuevas estrategias de mantenimiento están t...

Los cambios y variaciones cada vez más frecuentes en los precios del cobre, dejan de manifiesto, la necesidad de que las empresas mineras sean cada vez más rigurosas en el control de costos de producción, manteniendo su competitividad en el mercado internacional. De esta manera, el uso e implementación de nuevas estrategias de mantenimiento están t...

This study uses the application of finite element method in order to estimate the level of wear in elements of front loaders LeTourneau 1850, operating in mine Doña Ines de Collahuasi. Particularly the focus of the study using finite element method is on the wear parts that are considered “sacrifice parts” due to the extraction of mineral in the ro...

El fin del superciclo de precios del cobre ha dejado de manifiesto el desafío de ser más rigurosos en el control de costos de producción en la industria minera, por lo cual se deben explorar nuevas estrategias que permitan contener y bajar los costos asociados a la gestión de activos físicos de mantenimiento. La División Ministro Hales de Codelco,...

The pyrometallurgical copper extraction process generates 2.2 t of residues for each ton of produced metal. Initially, this paper shows the physical and chemical characterization of a copper processing residue, followed by the procedure to obtain the gold and silver that are contained in the copper residue. The characterization of a white metal oxi...

Although mechatronic systems are nowadays implemented in a large number of systems in vehicles, active lubrication systems are still incipient in industrial applications. This study is an attempt to extend the active lubrication concept to combustion engines and gives a theoretical contribution to this field. One refers to active lubrication when c...

The performance of main bearings in a combustion engine affects key functions such as durability, noise and vibration. Thus, with the aim of reducing friction losses and vibrations between the crankshaft and the bearings, the work reported here evaluates different strategies for applying controllable radial oil injection to main crankshaft journal...

In this work, an effective methodology to detect early stage faults in rotating machinery is proposed. The methodology is based on the analysis of cyclostationarity, which is inherent to the vibration signals generated by rotating machines. Of a particularly interest are the second and higher orders cyclostationary components since they contain val...

En este trabajo se presenta una metodología para detectar fallas incipientes en máquinas rotatorias. La metodología está basada en el análisis de cicloestacionariedad, la cual está presente en las señales de vibración generadas por máquinas rotatorias. De particular interés son las componentes cicloestacionarias de segundo orden y de órdenes superi...

In order to reduce friction losses and vibrations in main engine bearings, fluid film lubrication is combined to controllable radial oil injection. This work evaluates different geometric hybrid bearing configurations and control pressure rules for applying radial oil injection in main engine bearings of internal combustion engines. The conventiona...

This work deals with the mathematical modelling of multibody systems interconnected via thin fluid films. The dynamics of the fluid films can be actively controlled by means of different types of actuators, allowing significant vibration reduction of the system components. In this framework, this paper gives a theoretical contribution to the combin...

The performance of fluid film bearings in a combustion engine affects key functions such as durability, noise and vibration. Therefore, this work evaluates different control strategies for applying active radial oil injection in the main bearings of internal combustion engines with the aim of reducing friction losses and vibrations between the cran...

The feasibility of modifying the dynamics of the thin fluid films of dynamically loaded journal bearings, using different strategies of active lubrication is studied in this work. A significant reduction in the vibration levels, wear and power friction losses, is expected. Particularly, the focus of this study is on the analysis of main crankshaft...

In this work, the steps involved for the modelling of a reciprocating linear compressor are described in detail. The dynamics of the mechanical components are described with the help of multibody dynamics (rigid components) and finite elements method (flexible components). Some of the mechanical elements are supported by fluid film bearings, where...

This paper deals with one of the most common malfunctions in rotative machines: misalignment. Several studies have shown that misalignment produces at least 30% of the faults caused by vibration. In this work, an analysis of energetic losses generated by misalignment in rotative machines has been carried out, with the main objective of finding a co...

This work describes in details the steps involved within the mathematical modelling of multibody systems (rigid and flexible) interconnected via controllable thin fluid films. The dynamics of the mechanical components are described with help of multibody dynamics and finite element method. In this paper, the methodology is applied to reciprocating...

By using a multibody dynamic model of a single cylinder combustion engine, coupled to the equations that describe the dynamics of the fluid film generated by hydrodynamic pressure in the main journal bearing, this work deals with the feasibility of reducing wear and vibrations in the system components by means of applying hybrid controllable lubric...

In several cases the vibration signals generated by rotating machines can be modeled as cyclostationary processes. A cyclostationary process is defined as a non-stationary process which has a periodic time variation in some of its statistics, and which can be characterized in terms of its order of periodicity. This study is focused on the use of cy...

El presente trabajo resalta la importancia del balanceamiento de rotores como principal herramienta dentro de las tareas correctivas del mantenimiento predictivo, con el fin de que se reduzcan las vibraciones y sus efectos secundarios en las máquinas rotatorias. Se ha desarrollado un instrumento virtual para el balanceamiento dinámico de rotores, b...

El desarrollo de la electrónica y la computación ha propiciado de manera satisfactoria el desarrollo de técnicas de análisis de señales con aplicación al procesamiento de señales vibratorias. El alto costo de instrumentos comerciales para la recolección y análisis de vibraciones así como su arquitectura cerrada ha llevado a buscar nuevas alternativ...

Using spectral analysis of vibration to predict the presence of defects in the bearings of low-speed machines can be difficult. The vibrations generated by these machines are of low amplitude compared with the level of electrical noise, and in many cases this prevents the detection of defects in the bearings. In this paper, we used some real-world...

The vibration signal emitted by a bearing can contain spectral components that are related to the geometry of the bearing, the number of rolling elements, the speed of rotation, the location of the defect and the type of applied load; which marks the difference with a journal bearing type. It is of great importance in the modern industry to detect...

This work describes in details the steps involved within the mathematical modelling of reciprocating lin-ear compressors. The dynamics of the mechanical components are described with help of Dynamics of Multibody Systems (rigid components) and Finite Element Method (flexible components). Some of the mechanical elements are supported by fluid film b...

The work presented here is a theoretical study that describes two different schemes for the oil injection system in actively lubricated main engine bearings. The use of active lubrication in journal bearings helps to en-hance the hydrodynamic fluid film by increasing the fluid film thickness and consequently reducing viscous friction losses and vib...