This paper presents a flywheel energy storage system, which uses a switched reluctance motor/generator. It is shown how this device can be used either together with a DVR or alone in order to attenuate the effects of voltage sags and short interruptions. In order to improve the system efficiency, some design alternatives are presented. Finite elements analyses results, validated against laborat...

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A hydraulic excavator (HE) is a typical piece of construction equipment and widely used in various fields. However, the poor energy efficiency HEs results serious waste has aroused attention researchers. Furthermore, rising fuel prices increasing stringent gas emission legislation sparked demand for ways to improve efficiency. Recovering otherwise wasted boom potential conventional HE by proper...

Multiple sets of spring, spring seat structures are uniformly arranged in circumferential short dual mass flywheel (DMF), which generally have a symmetrical structure. The internal springs and seats constrained by the shape primary secondary flywheel. At different rotational speeds, centrifugal forces. To study dynamic characteristics DMF including torque stiffness with considering influence fo...

A theory based renewable energy sources course was complemented with seven hands-on laboratory experiments. The course was designed for engineering and non-engineering undergraduate students and did not require any advanced mathematics or physics background. Each laboratory experiment introduced a miniature version of an energy conversion device that mimicked the insights and workings of a real...

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Magnetic bearings are an attractive alternative to mechanical bearings in flywheel energy storage systems since they greatly reduce friction and wear. However, new problems are introduced in terms of stabilization; particularly the magnetic bearing must provide enough damping to reduce excessive vibrations. Two novel configurations of passive magnetic bearings are introduced to meet system requ...

This article discusses the coupled microvibration analysis of a cantilever configured Reaction Wheel Assembly with soft-suspension system. A RWA–seismic mass coupled microvibration measurement system is presented and its model validated against test results. The importance of the RWA driving point accelerances in coupled microvibration designed to measure the driving point accelerances in both ...