Browsing Faculty of Engineering by OzU Authors "Uğurlu, Regaip Barkan"
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Assessments on the improved modelling for pneumatic artificial muscle actuators
Peternel, L.; Uğurlu, Regaip Barkan; Babic, J.; Morimoto, J. (IEEE, 2015)In this paper, we present an analysis regarding the pneumatic air muscle modelling, with a particular emphasis on the exoskeleton robot control. We propose two calibration approaches for obtaining the model identification ... -
Environmental force estimation for a robotic hand : compliant contact detection
Kaya, Osman; Yıldırım, Mehmet Can; Kuzuluk, Nisan; Çiçek, Emre; Bebek, Özkan; Öztop, Erhan; Uğurlu, Regaip Barkan (IEEE, 2015)This paper presents a model based compensation method to enable environmental force estimation for a robotic hand with no tactile or force sensors. To this end, we utilize multi-joint robot dynamics and disturbance observer ... -
Learning to exploit passive compliance for energy-efficient gait generation on a compliant humanoid
Kormushev, P.; Uğurlu, Regaip Barkan; Caldwell, D. G.; Tsagarakis, N. G. (Springer, 2018-02-13)Modern humanoid robots include not only active compliance but also passive compliance. Apart from improved safety and dependability, availability of passive elements, such as springs, opens up new possibilities for improving ... -
On the EMG-based torque estimation for humans coupled with a force-controlled elbow exoskeleton
Ullauri, J. B.; Petenel, L.; Uğurlu, Regaip Barkan; Yamada, Y.; Morimoto, J. (IEEE, 2015)Exoskeletons are successful at supporting human motion only when the necessary amount of power is provided at the right time. Exoskeleton control based on EMG signals can be utilized to command the required amount of support ... -
Optimal stiffness tuning for a lower body exoskeleton with spring-supported passive joints
Yıldırım, Mehmet Can; Şendur, Polat; Soliman, Ahmed Fahmy; Uğurlu, Regaip Barkan (IEEE, 2018-10-09)This paper presents a framework to optimally tune the stiffness values of spring-supported passive joints that are included in lower body exoskeletons. First, a dynamic model of a combined human-exoskeleton system was ... -
Pattern generation and compliant feedback control for quadrupedal dynamic trot-walking locomotion: experiments on roboCat-1 and hyQ
Uğurlu, Regaip Barkan; Havoutis, I.; Semini, C.; Kayamori, K.; Caldwell, D. G.; Narikiyo, T. (Springer Science+Business Media, 2015-04)In this paper, we introduce a method that synergistically combines an analytical pattern generator and a feedback controller frame, which are developed for the purpose of synthesizing dynamic quadrupedal trot-walking ... -
Proof of concept for robot-aided upper limb rehabilitation using disturbance observers
Uğurlu, Regaip Barkan; Nishimura, M.; Hyodo, K.; Kawanishi, M.; Narikiyo, T. (IEEE, 2015-02)This paper presents a wearable upper body exoskeleton system with a model-based compensation control framework to support robot-aided shoulder-elbow rehabilitation and power assistance tasks. To eliminate the need for EMG ... -
Shoulder glenohumeral elevation estimation based on upper arm orientation
Hamdan, Sara; Öztop, Erhan; Furukawa, J.-I.; Morimoto, J.; Uğurlu, Regaip Barkan (IEEE, 2018-10-26)In this paper, the shoulder glenohumeral displacement during the movement of the upper arm is studied. Four modeling approaches were examined and compared to estimate the humeral head elevation (vertical displacement) and ... -
A stability analysis for the acceleration-based robust position control of robot manipulators via disturbance observer
Sarıyıldız, E.; Sekiguchi, H.; Nozaki, T.; Uğurlu, Regaip Barkan; Ohnishi, K. (IEEE, 2018-10)This paper proposes a new nonlinear stability analysis for the acceleration-based robust position control of robot manipulators by using disturbance observer (DOb). It is shown that if the nominal inertia matrix is properly ... -
Torque and variable stiffness control for antagonistically driven pneumatic muscle actuators via a stable force feedback controller
Uğurlu, Regaip Barkan; Forni, P.; Doppmann, C.; Morimoto, J. (IEEE, 2015)This paper describes a novel controller that is capable of simultaneously controlling torque and variable stiffness in real-time, for actuators with antagonistically driven pneumatic artificial muscles (PAMs). To this end, ... -
Towards balance recovery control for lower body exoskeleton robots with variable stiffness actuators: spring-loaded flywheel model
Doppmann, C.; Uğurlu, Regaip Barkan; Hamaya, M.; Teramae, T.; Noda, T.; Morimoto, J. (IEEE, 2015)This paper presents a biologically-inspired real-time balance recovery control strategy that is applied to a lower body exoskeleton with variable physical stiffness actuators at its ankle joints. For this purpose, a torsional ... -
Variable ankle stiffness improves balance control: experiments on a bipedal exoskeleton
Uğurlu, Regaip Barkan; Doppmann, C.; Hamaya, M.; Forni, P.; Teramae, T.; Noda, T.; Morimoto, J. (IEEE, 2016-02)This paper proposes a real-time balance control technique that can be implemented to bipedal robots (exoskeletons, humanoids) whose ankle joints are powered via variable physical stiffness actuators. To achieve active ...
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