Topic
Inertia
About: Inertia is a research topic. Over the lifetime, 12006 publications have been published within this topic receiving 164291 citations.
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TL;DR: In this article, the authors examined flow in a cylindrical electrorheological clutch and discussed the fluid dynamic and inertial effects which limit the speed of operation, and showed that the fluid density and viscosity place an upper limit on the acceleration of the output rotor.
Abstract: We examine flow in a cylindrical electrorheological clutch and discuss the fluid dynamic and inertial effects which limit the speed of operation. Time-dependent solutions of the equation of motion are developed in which the fluid is treated as a homogeneous continuum obeying the Bingham plastic constitutive equation. Some approximations have to be made but the results give a realistic description of the acceleration in clutches of practical dimensions. The problem is also approached in an entirely different way by direct numerical integration using an alternative time-dependent model. There is agreement between the two methods and the results show that the fluid density and viscosity place an upper limit on the acceleration of the output rotor. This is only reached if very low moment of inertia rotors are used, otherwise the output hardware inertia is the limiting factor. Design formulae are developed to give a rough estimate for the fluid limited acceleration and to define the minimum output moment of inertia that can usefully be employed to give maximum available acceleration.
56 citations
TL;DR: The proposed algorithm can be integrated with distributed generation setting algorithms to improve dynamic performance and lower implementation requirements and the negative impact of inertia emulation on energy efficiency can be reduced.
Abstract: The large inertia of a traditional power system slows down system U+02BC s frequency response but also allows decent time for controlling the system. Since an autonomous renewable microgrid usually has much smaller inertia, the control system must be very fast and accurate to fight against the small inertia and uncertainties. To reduce the demanding requirements on control, this paper proposes to increase the inertia of photovoltaic U+0028 PV U+0029 system through inertia emulation. The inertia emulation is realized by controlling the charging U+002F discharging of the direct current U+0028 DC U+0029-link capacitor over a certain range and adjusting the PV generation when it is feasible and U+002F or necessary. By well designing the inertia, the DC-link capacitor parameters and the control range, the negative impact of inertia emulation on energy efficiency can be reduced. The proposed algorithm can be integrated with distributed generation setting algorithms to improve dynamic performance and lower implementation requirements. Simulation studies demonstrate the effectiveness of the proposed solution.
56 citations
TL;DR: In this paper, a finite element model of the beam transverse motion in the plane is formulated through the extended Hamilton's principle, and the stability of the model is investigated with respect to axial location and the inertia of the concentrated mass, the location of the follower force direction control sensor, the sensor gain and the magnitude of the constant follower force.
56 citations
TL;DR: In this article, the authors introduce the mechanisms and underlying physics in inertial microfluidic systems with specific focuses on inertial particle migration and secondary flow, and outline the opportunities provided by the field, along with an outlook on the field.
Abstract: In 1961, Segre and Silberberg first reported the tubular pinch effect and numerous theoretical studies were subsequently published to explain the inertial particle migration phenomenon. Presently, as fluid mechanics meets micro- and nanotechnology, theoretical studies on intrinsic particle migration and flow phenomena associated with inertia are being experimentally tested and validated. This collective study on the fluid-particle-structure phenomena in microchannels involving fluid inertia is called, “inertial microfluidics”. Beyond theoretical studies, now inertial microfluidics has been gaining much attention from various research fields ranging from biomedicine to industry. Despite the positive contributions, there is still a lack of clear understanding of intrinsic inertial effects in microchannels. Therefore, this minireview introduces the mechanisms and underlying physics in inertial microfluidic systems with specific focuses on inertial particle migration and secondary flow, and outlines the opportunities provided by inertial microfluidics, along with an outlook on the field.
56 citations
TL;DR: This paper provides a comprehensive summary of inertia definitions for both synchronous generators and CIGs as well as their corresponding estimation methods and offers for the first time a framework to quantify the virtual inertia of Cigs at the component and aggregation levels.
56 citations