Browsing by Author "Estensoro, Patxi"
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Item Assembled PTO based on an array of double-acting hydraulic cylinders for WECs: From Conceptual Design to an Adjusted Detailed Model(2015-04-22) Antolín-Urbaneja, Juan Carlos; Cortes, A.; Marcos, Marga; Lasa, Joseba; Estensoro, Patxi; Cabanes, Itziar; Tecnalia Research & InnovationAll Wave Energy Converters (WECs) based on wave activated bodies comprises a Power Take- Off (PTO) system among other subsystems like the reaction mechanism, the supervisor of the system and the electrical generator. One of the most applied PTO systems consists of oil high pressure hydraulic devices. These devices are able to apply high forces, to store large quantities of energy through accumulators and to provide smoother power output to the motor coupled to a generator. In these systems the poor efficiency and the oil leakages contaminating the environment are considered main drawbacks. Despite of this, they are widely used in several promising WECs with the aim of optimizing the harvested wave energy along the time. The initial challenge to absorb an oscillating movement of ±30º at 5rad/s as a maximum angular speed absorbing up to 16000Nm from a specific WEC, led to the development of a simplified hydraulic model before manufacturing a PTO prototype to be verified in a Test Bench (Figure 1). The experimental results of PTO under different conditions have been used to adjust a full detailed PTO Model using Mathworks® software platform. This work presents a patented oil high pressure hydraulic PTO prototype based on an array of four double-acting hydraulic cylinders. This prototype has been designed and completely modelled as a proof concept at 1:4 scale being able to apply a variable Coulomb type damping torque through the activation of each hydraulic cylinder independently and through the modification of geometrical parameters easily. The complete model of the PTO has been accurately tuned up through adjustment of model parameters using the results of the experimental tests. This will allow the study of control strategies to optimize the extracted wave energy from a specific WEC, like point-absorbers.Item Compact and cost effective instrument for detecting drug precursors in different environments based on fluorescence polarization(SPIE-INT SOC OPTICAL ENGINEERING, 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA, 2013) Antolín-Urbaneja, Juan Carlos; Eguizabal, I.; Briz, N.; Dominguez, A.; Estensoro, Patxi; Secchi, A.; Varriale, A.; Di Giovanni, S.; D´Auria, S.; Tecnalia Research & Innovation; ROBOTICA_AUTOMA; TECNOLOGÍAS DE HIDRÓGENO; SG; MAQUINAS; GENERALSeveral techniques for detecting chemical drug precursors have been developed in the last decade. Most of them are able to identify molecules at very low concentration under lab conditions. Other commercial devices are able to detect a fixed number and type of target substances based on a single detection technique providing an absence of flexibility with respect to target compounds. The construction of compact and easy to use detection systems providing screening for a large number of compounds being able to discriminate them with low false alarm rate and high probability of detection is still an open concern. Under CUSTOM project, funded by the European Commission within the FP7, a stand-alone portable sensing device based on multiple techniques is being developed. One of these techniques is based on the LED induced fluorescence polarization to detect Ephedrine and Benzyl Methyl Keton (BMK) as a first approach. This technique is highly selective with respect to the target compounds due to the generation of properly engineered fluorescent proteins which are able to bind the target analytes, as it happens in an “immune-type reaction”. This paper deals with the advances in the design, construction and validation of the LED induced fluorescence sensor to detect BMK analytes. This sensor includes an analysis module based on high performance LED and PMT detector, a fluidic system to dose suitable quantities of reagents and some printed circuit boards, all of them fixed in a small structure (167mm x 193mm x 228mm) with the capability of working as a stand-alone application.Item Compact and cost effective instrument for detecting drug precursors in different environments based on fluorescence polarization (Poster)(2013) Antolín-Urbaneja, Juan Carlos; Eguizabal, I.; Briz, N.; Dominguez, A.; Estensoro, Patxi; Secchi, A.; Varriale, A.; Di Giovanni, S.; D´Auria, S.; Tecnalia Research & InnovationSeveral techniques for detecting chemical drug precursors have been developed in the last decade. Most of them are able to identify molecules at very low concentration under lab conditions. Other commercial devices are able to detect a fixed number and type of target substances based on a single detection technique providing an absence of flexibility with respect to target compounds. The construction of compact and easy to use detection systems providing screening for a large number of compounds being able to discriminate them with low false alarm rate and high probability of detection is still an open concern. Under CUSTOM project, funded by the European Commission within the FP7, a stand-alone portable sensing device based on multiple techniques is being developed. One of these techniques is based on the LED induced fluorescence polarization to detect Ephedrine and Benzyl Methyl Keton (BMK) as a first approach. This technique is highly selective with respect to the target compounds due to the generation of properly engineered fluorescent proteins which are able to bind the target analytes, as it happens in an “immune-type reaction”. This paper deals with the advances in the design, construction and validation of the LED induced fluorescence sensor to detect BMK analytes. This sensor includes an analysis module based on high performance LED and PMT detector, a fluidic system to dose suitable quantities of reagents and some printed circuit boards, all of them fixed in a small structure (167mm x 193mm x 228mm) with the capability of working as a stand-alone application.Item Construction of a Universal Hydraulic Power Take-Off for Wave Energy Converters. Mathematical Modelling and Validation Testing(2012-09) Lasa, Joseba; Antolín-Urbaneja, Juan Carlos; Estensoro, Patxi; Angulo, Carlos; Ricci, Pierpaolo; Santos, Maider; Tecnalia Research & InnovationThis paper presents the construction, mathematical modelling and validation testing of a scaled universal hydraulic Power Take-Off (PTO) device for Wave Energy Converters (WEC). A specific prototype and test bench were designed and built to carry out the validation tests. The results obtained by these tests were used to adjust an in-house mathematical model. The design of the PTO device led to an international patent application. The PTO was initially designed to be coupled to a scaled wave energy capture device with a low speed and high torque oscillating motion and high power fluctuations. Any energy capture device (ECD) that fulfils these requirements can be coupled to this PTO, provided that its scale is adequately defined depending on the rated power of the full scale prototype. The initial calibration included estimation of the pressure drops in the different components, the pressurization time of the oil inside the hydraulic cylinders and the volumetric efficiency of the complete circuit. Since the overall efficiency measured during the tests ranged from 0.69 to 0.8 and the dynamic performance of the PTO was satisfactory, the results are really promising and it is believed that this solution might prove effective in real devices.Item Design, Construction and Testing of a Hydraulic Power Take-Off for Wave Energy Converters(2012-06-01) Lasa, Joseba; Antolín-Urbaneja, Juan Carlos; Angulo, Carlos; Estensoro, Patxi; Santos, Maider; Ricci, Pierpaolo; Tecnalia Research & Innovation; INNOV_AIR_MOBIL; ROBOTICA_AUTOMA; GENERAL; POWER SYSTEMSThis paper presents the construction, mathematical modeling and testing of a scaled universal hydraulic Power Take-Off (PTO) device for Wave Energy Converters (WECs). A specific prototype and test bench were designed and built to carry out the tests. The results obtained from these tests were used to adjust an in-house mathematical model. The PTO was initially designed to be coupled to a scaled wave energy capture device with a low speed and high torque oscillating motion and high power fluctuations. Any Energy Capture Device (ECD) that fulfils these requirements can be coupled to this PTO, provided that its scale is adequately defined depending on the rated power of the full scale prototype. The initial calibration included estimation of the pressure drops in the different components, the pressurization time of the oil inside the hydraulic cylinders and the volumetric efficiency of the complete circuit. Since the overall efficiency measured during the tests ranged from 0.69 to 0.8 and the dynamic performance of the PTO was satisfactory, the results are really promising and it is believed that this solution might prove effective in real devices.Item Innovative Hydraulic Power Take-Off Construction and Performance Tests for Wave Energy Conversion(Trans Tech Publications Ltd, 2013) Antolín-Urbaneja, Juan Carlos; Lasa, Joseba; Estensoro, Patxi; Cabanes, Itziar; Marcos, Marga; Tecnalia Research & Innovation; ROBOTICA_AUTOMA; INNOV_AIR_MOBIL; GENERALThis document describes and demonstrates the features of a new innovative hydraulic Power take-Off (PTO) to be used for Wave Energy Conversion. This device is able to transform low frequency oscillating movement into a continuous high frequency angular speed, absorbing high fluctuated torque at the input shaft, which can reach up to 8000Nm. Moreover, the major breakthrough of this device is that it can control the braking torque through the modification of some geometrical parameters, L and R, and through the activation of more than one hydraulic cylinder together with the pressure. The output shaft of the PTO is able to rotate at different continuous rated speed through the actuation on a specific control valve at the inlet of the hydraulic motor. Tests to check the behavior of the PTO related to the smoothening of the power output and concerning the time needed to increase the high pressure and the time available after the accumulation of some quantity of energy in different initial conditions are presented.Item Modeling Innovative Power Take-Off Based on Double-Acting Hydraulic Cylinders Array for Wave Energy Conversion(2015-03-20) Antolín-Urbaneja, Juan Carlos; Cortes, A.; Cabanes, Itziar; Estensoro, Patxi; Lasa, Joseba; Marcos, Marga; Tecnalia Research & Innovation; ROBOTICA_AUTOMA; GENERAL; INNOV_AIR_MOBILOne of the key systems of a Wave Energy Converter for extraction of wave energy is the Power Take-Off (PTO) device. This device transforms the mechanical energy of a moving body into electrical energy. This paper describes the model of an innovative PTO based on independently activated double-acting hydraulic cylinders array. The model has been developed using a simulation tool, based on a port-based approach to model hydraulics systems. The components and subsystems used in the model have been parameterized as real components and their values experimentally obtained from an existing prototype. In fact, the model takes into account most of the hydraulic losses of each component. The simulations show the flexibility to apply different restraining torques to the input movement depending on the geometrical configuration and the hydraulic cylinders on duty, easily modified by a control law. The combination of these two actions allows suitable flexibility to adapt the device to different sea states whilst optimizing the energy extraction. The model has been validated using a real test bench showing good correlations between simulation and experimental tests