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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01 Nov 2010
TL;DR: In this article, the dynamics of a cloud of spheres at a small but finite Reynolds number were examined and two inertial regimes in which macro-scale and micro-scale inertia became successively dominant were identified.
Abstract: Through a comparison between experiments and numerical simulations, we have examined the dynamics of a cloud of spheres at a small but finite Reynolds number. The cloud is seen to flatten and to transition into a torus, which further widens and eventually breaks up into droplets. While this behaviour bears some similarity to that observed at zero inertia, the underlying physical mechanisms differ. Moreover, the evolution of the cloud deformation is accelerated as inertia is increased. Two inertial regimes in which macro-scale inertia and micro-scale inertia become successively dominant are clearly identified.
39 citations
TL;DR: In this paper, a planar quarter-car analytical model is proposed that not only considers vertical motion of the sprung mass (chassis) but also: (i) rotation and translation for the unsprung mass (wheel assembly), (ii) wheel mass and its inertia moment about the longitudinal axis, and (iii) tyre damping and lateral deflection.
Abstract: McPherson suspension modelling poses a challenging problem due to its nonlinear asymmetric behaviour. The paper proposes a planar quarter-car analytical model that not only considers vertical motion of the sprung mass (chassis) but also: (i) rotation and translation for the unsprung mass (wheel assembly), (ii) wheel mass and its inertia moment about the longitudinal axis, and (iii) tyre damping and lateral deflection. This kinematic–dynamic model offers a solution to two important shortcomings of the conventional quarter-car model: it accounts for geometry and for tyre modelling. The paper offers a systematic development of the planar model as well as the complete set of mathematical equations. This analytical model can be suitable for fast computation in hardware-in-the-loop applications. Furthermore, a reproducible Simulink implementation is given. The model has been compared with a realistic Adams/View simulation to analyse dynamic behaviour for the jounce and rebound motion of the wheel and two releva...
39 citations
Patent•
19 Feb 1992TL;DR: A pneumatic inertia tool for applying a cyclic percussive force to an orthopedic article via a reciprocating shuttle comprising a passageway extending between a first port and a second port is described in this paper.
Abstract: A pneumatic inertia tool for applying a cyclic percussive force to an orthopedic article via a reciprocating shuttle comprising a passageway extending between a first port and a second port. The shuttle travels within the passageway and strikes an anvil, imparting its momentum to the orthopedic article. The mass of the shuttle and its velocity at impact are selected to fix a bone relative to the orthopedic article via the existing inertia of the bone. The shuttle reciprocates within the passageway by alternating pressure and vacuum forces applied at the first port and at the second port.
39 citations
TL;DR: By designing quadratic functions in the controllers, the singularity can be avoided directly without using any filters or piecewise continuous functions, such that the stability analysis becomes more concise and straightforward.
Abstract: This article proposes a novel adaptive nonsingular predefined-time control strategy for rigid spacecrafts with inertia uncertainties. Following the backstepping recursive design procedures, an adaptive attitude controller is systematically presented to ensure that the spacecraft attitude can converge into a small region around the origin within a predefined time, which can be explicitly determined in advance by assigning a simple parameter. Moreover, by designing quadratic functions in the controllers, the singularity can be avoided directly without using any filters or piecewise continuous functions, such that the stability analysis becomes more concise and straightforward. Simulations are conducted to show the effectiveness of the presented method.
39 citations
21 May 2001
TL;DR: Simulation and experimental results show that the proposed planar parallel manipulator yields better dynamic performance than a conventional X-Y table and has great potential in application to high speed assembly.
Abstract: This paper presents a planar parallel mechanism which can achieve very rapid motion due to the low inertia of its moving parts and the use of multiple simultaneous specification (MSS) control. The proposed parallel manipulator was designed based on a prismatic-revolute-revolute kinematic structure. The proximal prismatic joints were realized using a linear slider with a ball screw mechanism. All actuators remain stationary resulting in a reduction of the inertia of moving parts. Since coupling terms between multiple chains of the parallel manipulator were significant, the MSS control scheme was implemented to satisfy multiple conflicting closed-loop performance specifications. Simulation and experimental results show that the proposed planar parallel manipulator yields better dynamic performance than a conventional X-Y table and has great potential in application to high speed assembly.
39 citations