A neuro-fuzzy approach to fast ferry vertical motion modelling

In order to stabilise the motion of a high speed craft, and so to improve the comfort of the passengers and the crew while maintaining the speed, control-oriented model are needed. For this purpose, neuro-fuzzy systems have been used to obtain general models of the nonlinear behaviour of a fast ferry. The sources of the available knowledge are the physical laws of the vertical dynamics of the craft, and some experimental and simulated data of the ship performance. Two non-linear models focused on the vertical motion of the craft, both heave and pitch, are proposed: an academic one and a predictive one. The modelling task is complex and the results are original as the problem has not been previously solved in a general way neither by applying artificial intelligence techniques. The models have been proved satisfactory with regular and also irregular waves, and they have been used for ship control purposes. (C) 2005 Elsevier Ltd. All rights reserved

Control de un vehículo cuatrirrotor basado en redes neuronales

[Resumen] En este trabajo se propone una estrategia de control neuronal adaptativa para estabilizar un vehículo aéreo no tripulado (UAV). Se estudia la influencia de la masa del cuatrirrotor y de las perturbaciones. Los resultados muestran cómo el aprendizaje online hace más robusto el control, minimizando los efectos de las variaciones en la masa y de las perturbaciones externas en la altura

Hızlı bir feribotun düşey ivmelenmesinin T-Foil ve trim tab sistem

his study is concerned with the active T-foil placed near the bow on the keel line of the fast ferry and two active trim tab controls placed at the stern to improve the maritime performance of a fast ferry, whilst improving the comfort and safety of passengers and crew. In the scope of the study, the vertical direction of the fast ferry under the random head waves, heave and pitch motions were taken into account. For the control of T-foil and trim Tabs, PID and LQR control methods were used. The purpose of these controllers is to reduce the acceleration of the heave and pitch motions of the fast ferry by changing the operating angles of the T-foil and trim tab wings. A random wave model was created using the Pierson-Moskowitz model, and simulations were done assuming that the fast ferry was subjected to random head waves. Finally, in order to see the effect of vertical acceleration on passengers, the rate of seasickness (MSI) change of the fast ferry in uncontrolled and controlled states was examined. Mathematical models of fast ferry, T-foil and trim tab and their simulations were carried out in MATLAB / Simulink environment. The simulation results show that T-foil and trim tab Active systems can effectively reduce vertical acceleration by improving heave and pitch motions.Bu çalışma, hızlı bir feribotun denizcilik performansını iyileştirmek, yolcu ile mürettebatın konfor ve güvenliğini artırmak için hızlı feribotun omurga hattında pruvaya yakın bir noktaya yerleştirilen hareketli T-foil ve kıç tarafına yerleştirilen iki adet hareketli trim tab kontrolü ile ilgilidir. Çalışma kapsamında baştan gelen düzensiz dalgaların etkisindeki hızlı feribotun düşey yönde yaptığı baş kıç vurma ve dalıp çıkma hareketleri dikkate alınmıştır. T-foil ve trim tabların kontrolü için ise PID ve LQR kontrol yöntemleri kullanılmıştır. Bu kontrolörlerin amacı, T-foil ve trim tab kanatlarının çalışma açılarının değiştirilmesiyle hızlı feribotun pozisyonunu kontrol ederek baş kıç vurma ve dalıp çıkma hareketlerinin ivmelenmesini azaltmaktır. Pierson-Moskowitz modelinden yararlanılarak düzensiz bir dalga modeli oluşturulmuş ve çalışmalar hızlı feribotun baştan gelen düzensiz dalgalara maruz kaldığı varsayılarak yapılmıştır. Son olarak düşey ivmelenmenin yolcular üzerindeki etkisini görebilmek için hızlı feribotun kontrolsüz ve kontrollü durumda deniz tutması oranı (MSI) değişimi incelenmiştir. Hızlı feribotun, T-foilin ve trim tabın matematiksel modelleri MATLAB / Simulink ortamında elde edilerek simülasyonları gerçekleştirilmiştir. Simülasyon sonuçları, T-foil ve trim tab aktif sistemlerinin baş kıç vurma ve dalıp çıkma hareketlerini iyileştirerek düşey ivmelenmeyi etkili bir şekilde azaltabildiğini göstermektedir

ANFIS Based Model for Ship Speed Prediction

Timely and precise speed prediction for large merchant ships is exceptionally important in almost all aspects of maritime transport. This paper explores the possibility of using the Adaptive Neuro-Fuzzy Inference System (ANFIS) for creating models for speed prediction of a bulk carrier depending on external hydrometeorological disturbances, namely wind speed, signifi cant wave height and the speed of the sea current. Using a navigational simulator, an appropriate data base concerning the effect of the wind, waves and currents on the ship speed with regard to different directions of the disturbances was formed. This base was used to create data sets for training, testing and verifying the validity of the ANFIS model. An analysis of the effect of selecting the appropriate input-output membership functions while creating the ANFIS model was also performed in order to solve the above mentioned problem. The results gained by the created model are surely promising, which opens a perspective on the implementation of the created model in certain segments of maritime affairs

Soft computing techniques applied to modelling and control of unmanned aerial vehicles

Tesis inédita de la Universidad Complutense de Madrid, Facultad de Informática, leída el 18-06-2019El uso de UAVs (vehículos autónomos aéreos), y en concreto, de cuatrirrotores o drones, está creciendo de día en día, y se espera que se usen en multitud de aplicaciones: rescate, seguridad,lucha contra incendios, agricultura, inspección de estructuras, logística, … En la mayoría de estas tareas los cuatrirrotores deben actuar de una forma totalmente autónoma. Estas aplicaciones y las que están por llegar requieren el diseño de modelos y controladores eficientes y robustos para esos vehículos no pilotados. Sin embargo, esta no es una tarea sencilla debido, entre otras causas, a la aleatoriedad de los flujos de aire, la dinámica altamente no lineal del UAV, el acoplamiento entre sus variables internas, etc. Estos factores hacen que las técnicas de Soft Somputing (computación suave, una rama de la Inteligencia Artificial), y entre ellas concretamente las redes neuronales artificiales y la lógica fuzzy, sean un enfoque prometedor para la identificación y el control de estos sistemas...The use of UAVs (unmanned aerial vehicles), and specially quadrotors, is growing day by day, they are planned to be used in multitude of valuable applications: rescue, security, firefighting, agriculture, structure inspection, logistics, … In most of those tasks, the quadrotorsare expected to be fully autonomous. All these applications and those to come, demand the design of efficient and robust models and controllers for those autonomous vehicles. However, this is not an easy task due to, among others: the randomness of the airstreams, the high nonlinearity dynamics, the coupling between the internal variables, etc. These factors make the Soft Computing techniques (a field of the Artificial Intelligence), and among them specially the artificial neural networks and the fuzzy logic, a promising approach for the identification and control of these systems...Fac. de InformáticaTRUEunpu

Métodos clásicos y de soft-computing en la optimización de procesos complejos: Aplicación a un proceso de fabricación

Tesis doctoral inédita. Universidad Autónoma de Madrid, Escuela Politécnica Superior, febrero de 201

Actas de las XXXIV Jornadas de Automática

Postprint (published version

Manipulador aéreo con brazos antropomórficos de articulaciones flexibles

[Resumen] Este artículo presenta el primer robot manipulador aéreo con dos brazos antropomórficos diseñado para aplicarse en tareas de inspección y mantenimiento en entornos industriales de difícil acceso para operarios humanos. El robot consiste en una plataforma aérea multirrotor equipada con dos brazos antropomórficos ultraligeros, así como el sistema de control integrado de la plataforma y los brazos. Una de las principales características del manipulador es la flexibilidad mecánica proporcionada en todas las articulaciones, lo que aumenta la seguridad en las interacciones físicas con el entorno y la protección del propio robot. Para ello se ha introducido un compacto y simple mecanismo de transmisión por muelle entre el eje del servo y el enlace de salida. La estructura en aluminio de los brazos ha sido cuidadosamente diseñada de forma que los actuadores estén aislados frente a cargas radiales y axiales que los puedan dañar. El manipulador desarrollado ha sido validado a través de experimentos en base fija y en pruebas de vuelo en exteriores.Ministerio de Economía y Competitividad; DPI2014-5983-C2-1-