1,721,515 research outputs found
Design and Numerical Study of a 2-DoF Mechanism for Efficient Wave Energy Extraction in Onshore Application
No full textThe electricity generation from wave energy represents an important step towards meeting renewable energy targets. The challenge of efficiently capturing the wave power is still an open topic for academies, scientific communities and companies’ commercial competitiveness. This paper presents a study on the design and numerical simulation of a two degrees of freedom mechanism able to maximize the mechanical energy transformation in onshore application. The effects of the geometric parameters, leverage lengths, heavy-buoy and paddles shapes, relative position between hinges, auxiliary masses position for semi-submerged conditions were systematically studied. The numerical results demonstrated that the resulting configuration setting is significantly influenced by hydrodynamic input performance, nevertheless the proposed device is able to guarantee a stable performance and it has an efficiency that could reach up to 64.9%
L'efficacia delle medicine alternative e complementari nella terapia dei disturbi psichici: una revisione sistematica della letteratura
No full textA Digital Twin Procedure for the Design, Simulation, and Optimization of Machine Tending Layout
No full textThis paper presents a structured design framework that aims to enhance the functionalities of robotized work cells in machine tending applications. The framework, developed through digital twin simulations in an educational context, addresses the increasing demand for off-line programming, reconfigurable workstations, and reduced installation time. The primary goal of this contribution is to disseminate the specific competencies in engineering students and technicians. The iterative methodology described in this approach enables the design of new systems or the adjustment of existing layouts to meet industrial demands and mitigate current constraints in a virtual environment
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Active vibration control development in ultra‐precision machining
No full textThis study presents a combined feedback–feedforward adaptive regulator applied to an active vibration control tool holder platform to contain the effect of machining vibrations. The proposed mechatronic solution can be integrated in a milling machine tool as an interface between the beam (Z-axis) and the tool holder. The aim is to counteract vibrations in the broadband frequency range (100 Hz–900 Hz), controlling the tool position in real time. The active vibration control system is based on the harmonic steady-state concept due to the sinusoidal representation of the disturbance signals. The study focuses on the regulator architecture and the main logics applied to satisfy the required performance. A full investigation is executed through simulations and experimental campaigns, proving the disturbance reduction. The active vibration control system is implemented on a 4-axis machine tool and validated using multitonal disturbances. The system is evaluated in compensating a set of undesired effects, such as vibrations generated by unbalanced tools or hard material cutting processes. The obtained results show a maximum reduction of the vibration amplitude by 43.7% at the critical frequency
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