Person:
Villanueva Roldán, Pedro

Last Name

Villanueva Roldán

First Name

Pedro

person.page.departamento

Ingeniería

ORCID

0000-0003-0865-3789

person.page.upna

2772

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Now showing 1 - 10 of 21

Open Access
Automatic trajectory determination in automated robotic welding considering weld joint symmetry
(MDPI, 2023) Curiel Braco, David; Veiga Suárez, Fernando; Suárez, Alfredo; Villanueva Roldán, Pedro; Aldalur, Eider; Ingeniería; Ingeniaritza
The field of inspection for welded structures is currently in a state of rapid transformation driven by a convergence of global technological, regulatory, and economic factors. This evolution is propelled by several key drivers, including the introduction of novel materials and welding processes, continuous advancements in inspection technologies, innovative approaches to weld acceptance code philosophy and certification procedures, growing demands for cost-effectiveness and production quality, and the imperative to extend the lifespan of aging structures. Foremost among the challenges faced by producers today is the imperative to meet customer demands, which entails addressing both their explicit and implicit needs. Furthermore, the integration of emerging materials and technologies necessitates the exploration of fresh solutions. These solutions aim to enhance inspection process efficiency while providing precise quantitative insights into defect identification and location. To this end, our project proposes cutting-edge technologies, some of which have yet to gain approval within the sector. Noteworthy among these innovations is the integration of vision systems into welding robots, among other solutions. This paper introduces a groundbreaking algorithm for tool path selection, leveraging profile scanning and the concept of joint symmetry. The application of symmetry principles for trajectory determination represents a pioneering approach within this expansive field.
Open Access
Weld joint reconstruction and classification algorithm for trajectory generation in robotic welding
(Trans Tech Publications, 2023) Curiel Braco, David; Veiga Suárez, Fernando; Suárez, Alfredo; Villanueva Roldán, Pedro; Aldalur, Eider; Ingeniería; Ingeniaritza
Open Access
Design and optimization of an electromagnetic servo braking system combining finite element analysis and weight-based multi-objective genetic algorithms
(Springer, 2016) Lostado Lorza, Rubén; Villanueva Roldán, Pedro; Fernández Martínez, Roberto; Mac Donald, Bryan J.; Ingeniería; Ingeniaritza
Open Access
Combining soft computing techniques and the finite element method to design and optimize complex welded products
(IOS Press, 2015) Lostado Lorza, Rubén; Fernández Martínez, Roberto; Mac Donald, Bryan J.; Villanueva Roldán, Pedro; Ingeniería; Ingeniaritza
Open Access
Design of an electromagnetic servo brake with ABS function
(Trans Tech Publications, 2015) Lostado Lorza, Rubén; Somovilla Gómez, Fatima; Corral Bobadilla, Marina; Villanueva Roldán, Pedro; Fernández Martínez, Roberto; Ingeniería; Ingeniaritza
Open Access
Pugh's total design: the design of an electromagnetic servo brake with ABS function - a case study
(SAGE, 2016) Villanueva Roldán, Pedro; Lostado Lorza, Rubén; Corral Bobadilla, Marina; Ingeniería; Ingeniaritza
Open Access
Residual stresses with time-independent cyclic plasticity in finite element analysis of welded joints
(MDPI, 2017) Lostado Lorza, Rubén; Corral Bobadilla, Marina; Martínez Calvo, María Ángeles; Villanueva Roldán, Pedro; Proyectos e Ingeniería Rural; Landa Ingeniaritza eta Proiektuak
Due to the intense concentration of heat in a reduced area when Gas Metal Arc Welding (GMAW) is used to join mechanical components, the regions near the weld bead are subjected to severe thermal cycles. Firstly, the region close to the weld bead that is heated tends to be in compression and, when it cools, tends to be in tension. According to Pilipenko, the material is exposed to elastic compression and, then, reaching the yield limit, undergoes plastic deformation with the appearance of residual stresses followed by elastic-plastic unloading. This could be considered as a strain-stress cycle. This paper applies plastic-strain-range memorization based on time-independent cyclic plasticity theory for butt joints with single V-groove Finite Element (FE) models that were manufactured by GMAW. The theory combines both the isotropic hardening and the nonlinear kinematic hardening rule (Chaboche model) to reproduce the behavior of cyclic plasticity and thus to obtain the residual stresses in welded joint FE models. As a practical example, the proposed theory is validated by three welded joint specimens that were manufactured with different input parameters of speed, voltage, and current. An agreement between the residual stresses obtained by the FE model proposed and those obtained experimentally by the hole drilling method at different depths demonstrates that the proposed theory could be valid for modelling the residual stresses in welded joints when cyclic plasticity is considered over the range of speed, voltage, and current studied.
Open Access
Análisis de sensibilidad de los parámetros de configuración de un proceso de soldadura GMA
(AEIPRO, 2011) Villanueva Roldán, Pedro; Ibarra Murillo, Martín; Sanz García, Andrés; Lostado Lorza, Rubén; Ingeniería; Ingeniaritza
El proceso de soldadura GMA en la fabricación de componentes mecánicos es una técnica difícil de ajustar debido al elevado número variables de configuración necesarias. A pesar de ello, dicho proceso se ha aplicado con éxito en múltiples sectores a lo largo del siglo XX. El ajuste óptimo de las variables de configuración es una tarea complicada ya que las desviaciones producen un incremento en las tensiones y deformaciones residuales en la pieza resultante. En el presente trabajo, un análisis de sensibilidad fue realizado para determinar la influencia de cada uno de los parámetros de configuración del proceso y posteriormente, poder establecer un orden de importancia. Un caso práctico de la soldadura de dos placas de acero fue realizado para realizar una lectura de datos y aplicar el análisis de sensibilidad.
Open Access
Diseño de un nuevo motor de explosión de dos tiempos con etanol como combustible
(Publicaciones DYNA SL, 2012) Lostado Lorza, Rubén; Villanueva Roldán, Pedro; Proyectos e Ingeniería Rural; Landa Ingeniaritza eta Proiektuak
Actualmente, el mecanismo en el cual están basados la mayoría de los motores de explosión mono o pluricilindricos y que montan los vehículos convencionales, es el tradicional mecanismo cigüeñal-biela-pistón. En este mecanismo, el pistón tiene la posibilidad de girar con respecto a la biela y de friccionar con las paredes del cilindro a medida que éste se desplaza por su interior. La fricción entre el pistón y las paredes del cilindro puede ocasionar un desgaste excesivo tanto del interior del cilindro como del propio pistón, y, en el peor de los casos, incluso un atascamiento (o gripaje) del pistón en su recorrido o carrera. Para reducir este desgaste y evitar los indeseables gripajes, los motores requieren de sofisticados circuitos de engrase, los cuales han de proporcionar una película lubricante homogénea y constante entre las paredes del cilindro y las paredes del pistón. En este artículo, se ha diseñado un nuevo motor de explosión reemplazando el mecanismo cigüeñalbiela- pistón tradicional, en el que el émbolo se desplaza con un movimiento alternativo rectilíneo, por un sistema en el que el émbolo describe un movimiento alternativo circular. En este nuevo sistema, el pistón está unido rígidamente a la biela mediante pasadores, suprimiendo el giro del pistón y evitando su contacto con las paredes interiores del cilindro. Esta restricción de giro, reduce tanto el desgaste del pistón y del cilindro como el consumo de aceite lubricante. El motor diseñado funciona con etanol, y su ciclo termodinámico es el de un motor de dos tiempos. En este motor, la admisión de la mezcla airecombustible se realiza mediante lumbreras laterales y el escape de los gases productos de la combustión a través de una válvula situada en la parte superior de la cámara de explosión hemisférica.
Open Access
Methodology for the path definition in multi-layer gas metal arc welding (GMAW)
(MDPI, 2023) Curiel Braco, David; Veiga Suárez, Fernando; Suárez, Alfredo; Villanueva Roldán, Pedro; Ingeniería; Ingeniaritza
The reconstruction of the geometry of weld-deposited materials plays an important role in the control of the torch path in GMAW. This technique, which is classified as a direct energy deposition technology, is experiencing a new emergence due to its use in welding and additive manufacturing. Usually, the torch path is determined by computerised fabrication tools, but these software tools do not consider the geometrical changes along the case during the process. The aim of this work is to adaptively define the trajectories between layers by analysing the geometry and symmetry of previously deposited layers. The novelty of this work is the integration of a profiling laser coupled to the production system, which scans the deposited layers. Once the layer is scanned, the geometry of the deposited bead can be reconstructed and the symmetry in the geometry and a continuous trajectory can be determined. A wall was fabricated under demanding deposition conditions, and a surface quality of around 100 microns and mechanical properties in line with those previously reported in the literature are observed.