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Garitaonandia I.,University of the Basque Country | Albizuri J.,University of the Basque Country | Fernandes M.H.,University of the Basque Country | Hernandez J.M.,University of the Basque Country | And 2 more authors.
International Journal of Mechatronics and Manufacturing Systems | Year: 2011

The appearance of vibrations during centreless grinding process is one of the main factors limiting the current requirements of precision and productivity. This paper presents a novel procedure for the design of an active vibration reduction system in a centreless grinding machine using piezoelectric actuators. The different phases involved in the modelling procedure of the machine tool are explained, together with the followed approach to locate the actuators. Taking as reference the finite element model of the machine, the most important mode shapes affecting the chatter behaviour have been considered to obtain a low order state space model. This reduced model has been used to simulate the effectiveness of the control strategy and the results have been compared with those obtained experimentally after the system implementation. A good agreement has been obtained demonstrating that the modelling procedure followed is useful to predict the effectiveness of control systems. Copyright © 2011 Inderscience Enterprises Ltd.

Garitaonandia I.,University of the Basque Country | Albizuri J.,University of the Basque Country | Hernandez-Vazquez J.M.,University of the Basque Country | Fernandes M.H.,University of the Basque Country | And 2 more authors.
Precision Engineering | Year: 2013

In this paper a novel methodology is presented to optimize an active chatter control system based on piezoelectric actuators in a centerless grinding machine. With the proposed modeling procedure, a compact and efficient control system is obtained, perfectly adapted to the specific characteristics of the machine. First, the previous theoretical and experimental works done in the centerless grinding machine under study are presented briefly, with emphasis on the development of a validated finite element (FE) model capable of predicting the behavior of the machine controlled actively. Afterwards, making use of this FE model, a theoretical procedure is developed to optimize the control system. Concretely, the piezoelectric actuators are redesigned to achieve a solution oriented to the specific characteristics of the machine and the control algorithm is adapted to the new design, leading to a highly integrated mechatronic solution. The new active control scheme is simulated using a reduced order state space model, verifying the effectiveness of the proposed solution. Finally, in line with the new design, a prototype is manufactured and integrated in the machine, and the experimental results obtained from different operating conditions are shown. The study of the theoretical and experimental results makes it possible to verify the improvements in the chatter stability of the process once the control system has been applied, as well as to confirm the theoretically predicted performance. This way, the work carried out in this paper shows the satisfactory use of a validated FE model to deal with the optimization process of an active vibration control system. © 2013 Elsevier Inc.

Mujika A.,Vicomtech IK4 | Oyarzun D.,Vicomtech IK4 | Iparragirre I.,Vicomtech IK4 | Dominguez J.,IDEKO IK4
ICETA 2011 - 9th IEEE International Conference on Emerging eLearning Technologies and Applications, Proceedings | Year: 2011

In this paper, we present the project MACHS, a platform for the generation of serious games, i.e. courses in 3D environments for machine-tool training. The platform consists of two applications: an easy-to-use authoring tool for editing the courses and a 3D simulator for running them. In this paper, we describe the features and the functionalities of each part of the platform. We also describe the structure of the XML files designed for the storage of the information about courses, machines, cameras, interaction, etc. and how we use them to link the editor and the simulator. © 2011 IEEE.

Iloro I.,CIC Biomagune | Bueno A.,IDEKO IK4 | Calvo J.,CIC Biomagune | Urreta H.,IDEKO IK4 | Elortza F.,CIC Biomagune
Journal of Laboratory Automation | Year: 2016

Matrix-assisted laser desorption/ionization (MALDI) imaging mass spectrometry (IMS) is a powerful tool for investigating the distribution of proteins and other molecules within biological systems through the in situ analysis of tissue sections, enabling molecular histology. MALDI IMS can determine the distribution of hundreds of unknown compounds in a single measurement while maintaining spatial and molecular integrity. The matrix spraying stage is a key factor in making this technique more sensitive and robust. In this article, we describe a custom-made matrix sprayer (Langartech), which is both inexpensive (estimated cost of about €3000, or $3500) and reliable compared with the alternatives present in the market today, with prices greater than €20,000 ($25,000). Several comparisons were made between our Langartech sprayer and one of the high-end matrix sprayers commercially available: ImagePrep (Bruker Daltonics). Focusing on lateral resolution and observed peak intensities, overall results show that our sprayer behaves in a very competitive fashion, especially when taking into account the huge difference in sophistication level and price. © 2015, 2015 Society for Laboratory Automation and Screening.

Barrenetxea D.,IDEKO IK4 | Marquinez J.I.,IDEKO IK4 | Alvarez J.,IDEKO IK4 | Fernandez R.,University of Mondragon | And 3 more authors.
Machining Science and Technology | Year: 2012

Recent advances in process modeling allow for more accurate prediction of complex phenomena. A combination of different modeling approaches makes it possible to develop new products to set up, control and optimize machining operations. In the near future, a continuous improvement strategy should be adopted, as improvements to advanced models open up new opportunities for industrial applications. In particular, the efforts made by different research groups on grinding have given rise to significant developments in this area, some of which have recently been made into applied software. As an example of the necessity for process modeling and the viability of industrialized tools based on it, this article presents the work carried out on the development of an assistant tool for the setting up and optimization of the centerless grinding process, focusing on avoiding the main limitations of this process and optimizing productivity. © 2012 Copyright Taylor and Francis Group, LLC.

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