1,721,032 research outputs found
A new pneumatic pad controlled by means of an integrated proportional valve
Full text linkAerostatic air bearings have the advantages of supporting loads with no friction and wear and for this feature they are extensively adopted in metrology as they allow very precise motion. The possibility of integrating an active component increases the performance of the aerostatic pads, which can be designed in order to obtain an infinite stiffness or to improve stability. In [1, 2] the authors developed a prototype of active pad controlled by means of digital valves and Arduino board. A shortcoming of this prototype was a small amplitude oscillation of the pad supply pressure due to the opening and closing of the digital valve. In order to overcome this problem a new prototype was designed making use of a proportional valve. This paper shows the first experimental tests together with the numerical model
Logica fuzzy nella pneumatica
No full textIn this paper the most recent applications of fuzzy logic to pneumatic systems are presented. In particular, pneumatic actuators with position, speed and force control are examined, together with Cartesian robots with pneumatic drives and fuzzy control
a proposed methodology for the development of microgrippers: an application to a silicon device actuated by shape memory alloy wire
No full textDevelopment of a 4-DoF Active Upper Limb Orthosis
Full text linkIn this paper, the designs and manufacturing process of a powered upper limb orthosis are presented. The orthosis is an exoskeleton worn on one arm by the user and fixed to the trunk. The orthosis’ architecture, design, and manufacturing process are presented and discussed. Estimations of the ranges of movement related to daily living activities are presented. The preliminary tests to verify the functionality of the design show encouraging results
Three-Degree-of-Freedom Cable-Driven Parallel Manipulator with Self-Sensing Nitinol Actuators
Full text linkThis paper presents the design and analysis of a novel 3-degree-of-freedom (3-DOF) parallel manipulator equipped with self-sensing Ni-Ti (Nitinol) actuators. The manipulator’s architecture and mechanical design are elucidated, emphasizing the integration of Nitinol actuators. The self-sensing technique implemented in a previous work was extended to a 20 mm actuator length, and the actuator was used to design the 3-DOF manipulator. Kinematic analyses were conducted to evaluate the manipulator’s performance under various operating conditions. A dynamic model was implemented for the dynamic dimensioning of the actuators, which work synergistically with a bias spring. The manipulator was realized, and a control strategy was implemented. Experimental tests, although documenting some positioning accuracy issues, show the efficacy and potential applications of the proposed manipulator in robotics and automation systems, highlighting the advantages of self-sensing Nitinol actuators in small parallel manipulator designs
Welcome to WTC V
No full textWTC2013 is the fifth World Tribology Congress that takes place in Torino after the sessions in London (1997), Vienna (2001), Washington DC (2005) and Kyoto (2009). The main objective of these meetings is to provide a unique opportunity of discussion concerning recent progress in different aspects of tribology and strength the linkage between academy and industry
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