Nowadays, the inerter device has become one of most popular mechanical devices in the vibration absorption field for both stationary and non-stationary mechanical structures. One of the problems commonly reported in the literature is the force transmission control in the foundations that support the machines, which is generally addressed by using either isolators or classic dynamic vibration absorbers (DVAs). However, the mechanical energy dissipation capability of these two solutions is still limited. This work focuses on improving the control performance for the conventional absorber using the inerter’s inertial mass amplification and negative stiffness effects. In order to fairly evaluate the control performance of the DVA based on grounded inerter, the and optimization criteria are proposed. When the dimensionless frequency response function (FRF) of the transmissibility is minimized at the resonant peaks, the criterion reveals an improvement of 29.74% in mitigating harmonic vibration. Finally, the total vibration energy transmitted to the foundation is minimized via criterion that provides an improvement of 33.03%.
En este trabajo se presenta una revisión exhaustiva de los diferentes tipos de amortiguadores regenerativos utilizados para mejorar la reducción del consumo de combustible y de las emisiones contaminantes (principalmente el CO2) en vehículos comerciales. En primera instancia, se describe la interacción entre el tren motriz y el sistema de suspensión automotriz, incluyendo los ciclos de velocidad de conducción como el enlace principal. Posteriormente, se presenta un esquema gráfico del proceso de regeneración de energía vibratoria mediante amortiguadores regenerativos, considerando el sistema de almacenamiento de energía. Además, se discuten los avances tecnológicos recientes de los diferentes tipos de amortiguadores regenerativos, sopesando principalmente la filosofía de diseño del mecanismo de rectificación de energía vibratoria. Finalmente, se presentan las conclusiones y tendencias futuras sobre las aplicaciones de estos dispositivos en diferentes disciplinas de la ingeniería.
<p>This work focused on the design, development and construction of a new low cost soldering iron that works by means of induction heating. The amount of electronic components has been minimized in order to reduce production costs. Additional tests were undertaken to determine the ideal tips for soldering, and the adaptations necessary to guarantee self-regulation using a nickel foil shield (due to its low curie temperature) are suggested. The new device contains a resonant inverter able to generate alternating magnetic fields of 100 kHz at the center of an 18-turn coil; the inverter is controlled only using an astable oscillator circuit. The paper examines criteria to select suitable soldering-tips by experimentally determining their equivalent resistance heating it within the resonant inverter or well, another one by using a rapid magnetic test. The system represents a good tool, suitable for the manufacture of development boards or electronic tasks.</p>
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