Browsing Mechanical Engineering by Title
Now showing items 446-465 of 465
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Topology optimization-based design and development of a compact actuator with a high torque-to-weight ratio for quadrupeds
(IEEE, 2022)This paper presents the design, development, and testing procedures for a compact actuator with a high torque-to-weight ratio, generally aimed to actuate legged robots, e.g., quadrupeds. The main goal of designing the ... -
Torque and variable stiffness control for antagonistically driven pneumatic muscle actuators via a stable force feedback controller
(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, ... -
A torque matched aerodynamic performance analysis method for the horizontal axis wind turbines
(Wiley, 2013-11)An analysis method is developed to test the operational performance of a horizontal axis wind turbines. The rotor is constrained to the torque–speed characteristic of the coupled generator. Therefore, the operational ... -
Towards active tracking of beating heart motion in the presence of arrhythmia for robotic assisted beating heart surgery
(Plos, 2014-07-21)In robotic assisted beating heart surgery, the control architecture for heart motion tracking has stringent requirements in terms of bandwidth of the motion that needs to be tracked. In order to achieve sufficient tracking ... -
Towards balance recovery control for lower body exoskeleton robots with variable stiffness actuators: spring-loaded flywheel model
(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 ... -
Towards crutch-free 3-D walking support with the lower body exoskeleton Co-Ex: Self-balancing squatting experiments
(Springer, 2022)In this paper, we succinctly present the hardware properties and capabilities of the lower body exoskeleton Co-Ex, which was developed to attain self-balancing and crutch-free walking support for those experiencing ambulatory ... -
Transdisciplinarity as a learning challenge: Student experiences and outcomes in an innovative course on wearable and collaborative robotics
Contribution: This study provides evidence for the benefit of short online courses for transdisciplinary competence development of graduate students. It shows the significant challenges students face while learning, and ... -
Tunable near-field radiative transfer by III–V group compound semiconductors
(IOP Publishing, 2019-03-06)Near-field radiative transfer (NFRT) refers to the energy transfer mechanism which takes place between media separated by distances comparable to or much smaller than the dominant wavelength of emission. NFRT is due to the ... -
Turbulence impact on wind turbines: experimental investigations on a wind turbine model
(IOP Publishing, 2016)Experimental investigations have been conducted by exposing an efficient wind turbine model to different turbulence levels in a wind tunnel. Nearly isotropic turbulence is generated by using two static squared grids: fine ... -
A type-2 fuzzy controller for floating tension-leg platforms in wind turbines
(MDPI, 2022-03)This paper proposes a type-2 fuzzy controller for floating tension-leg platforms in wind turbines. Its main objective is to stabilize and control offshore floating wind turbines exposed to oscillating motions. The proposed ... -
Understanding selectivity on Germanium/SiO2 chemical mechanical planarization through design of experiments
(Cambridge University Press, 2015)The continuous trend of achieving more complex microelectronics with smaller nodes yet larger wafer sizes in microelectronics manufacturing lead to aggressive development requirements for chemical mechanical planarization ... -
A unified Monte Carlo treatment of the transport of electromagnetic energy, electrons, and phonons in absorbing and scattering media
(Elsevier, 2010-02)The scalar Boltzmann transport equation (BTE) is often applicable to radiative energy transfer, electron–beam propagation, as well as thermal conduction by electrons and phonons provided that the characteristic length of ... -
Üretim parametrelerinin, lazer toz yatağı füzyon yöntemi ile üretilen kafes yapıların çarpılma, boyutsal değişim ve yüzey pürüzlülüğü üzerindeki etkisi
(Gazi Üniversitesi, 2023)Yüksek ısı transfer kabiliyeti, enerji absorbe edebilme ve ses izolasyonu özelliklerinden dolayı kafes yapılar havacılık, otomotiv ve biyomedikal sanayii başta olmak üzere birçok alanda kullanılmaktadır. Kafes yapıların ... -
Validation and comparison of 2D and 3D numerical simulations of flow in simplex nozzles
(Europe, Institute for Liquid Atomization and Spray Systems, ILASS, 2021-08-31)Numerical simulations of pressure swirl atomizers are computationally expensive due to transient and multiphase flow behavior. In this study, 2D and 3D VOF simulations are performed for a geomerty which has high swirl ... -
Variable ankle stiffness improves balance control: experiments on a bipedal exoskeleton
(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 ... -
Visual needle tip tracking in 2D US guided robotic interventions
(Elsevier, 2019-02)Percutaneous needle procedures are among the most frequently performed minimally invasive surgical procedure. For tracking the needle tip in the tissue, 2D ultrasound (US) imaging is commonly used; however, the low resolution ... -
Visual tracking of biopsy needles in 2D ultrasound images
(2016)Ultrasound (US) is one the most commonly used medical imaging techniques in percutaneous needle procedures. However, US images are inherently noisy and contain excessive number of artifacts. Hence, it is not easy to track ... -
Visual tracking of multiple moving targets in 2D ultrasound guided robotic percutaneous interventions
(IEEE, 2017)Percutaneous needle procedures are mostly carried out with the guidance of 2D ultrasound (US) imaging. US images are inherently noisy and their resolutions are low. Hence, target tracking can be challenging. Image based ... -
Workability characteristics and mechanical behavior modeling of severely deformed pure titanium at high temperatures
(Elsevier, 2014-01)In the present study, compression tests were performed at temperatures of 600–900 °C and at strain rates of 0.001–0.1 s−1 to study the deformation and workability characteristics of commercially pure titanium after severe ... -
ZMP-based online jumping pattern generation for a one-legged robot
(IEEE, 2010-05-01)This paper is aimed at presenting a method to generate online jumping patterns, which can be applied to one legged jumping robots and optionally to humanoid robots. Our proposed method is based on ensuring the overall ...
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