Relevant bibliographies by topics / Inerzia variabile

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Academic literature on the topic 'Inerzia variabile'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Inerzia variabile"

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Martínez Aranda, Luis Manuel, and Rodrigo Fernández Gonzalo. "Comparación de dos dispositivos de medición de potencia y trabajo durante ejercicio de fuerza con tecnología inercial flywheel (Comparison of two power and work data acquisition systems during resistance exercise employing flywheel inertial technology)." Retos, no. 29 (December 18, 2015): 144–48. http://dx.doi.org/10.47197/retos.v0i29.41308.

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El objetivo del presente estudio fue comparar los valores de potencia y trabajo obtenidos en tiempo real mediante los sistemas BlueBrainTM y SmartCoachTM, durante ejercicio de fuerza en una prensa de piernas equipada con tecnología inercial flywheel, usando diferentes inercias (cargas). Se realizaron ocho series de siete repeticiones a intensidades variable y máxima, con dos minutos de descanso entre series, para cada inercia utilizada en el protocolo: 0.0125; 0.025; 0.0375; 0.05; 0.0625 y 0.075 kg*m², midiendo simultáneamente la potencia media concéntrica y el trabajo total (concéntrico-excéntrico) con ambos dispositivos. Los datos fueron analizados mediante un análisis de regresión lineal y un estudio de correlación. Se observó una correlación altamente significativa en los datos de potencia media entre ambos dispositivos en todas las inercias e intensidades evaluadas, tanto a nivel individual como global, (r=.968; Sig.(bilateral)=.000; R2=.937). De la misma forma, los datos de trabajo correlacionaron de forma muy significativa (r=.978; Sig.(bilateral)=.000; R2=.957). Las diferencias de registro entre ambos dispositivos oscilaron en un rango de 2.6-4.3 %. Dado el alto grado de significación en las correlaciones analizadas para potencia y trabajo, todo parece indicar que ambos dispositivos se muestran como instrumentos válidos y similares para estimar la potencia y el trabajo durante ejercicios de fuerza con tecnología inercial, siendo de gran ayuda para el seguimiento y control del entrenamiento usando esta tecnología.Abstract. The aim of this study was to compare real-time values of power and work obtained through BlueBrainTM and SmartCoachTM systems during flywheel leg press exercise using different inertias (loads). Eight sets of seven repetitions were performed at variable and maximum intensity for each inertia used (i.e. 0.0125; 0.025; 0.0375; 0.05; 0.0625 and 0.075 kg*m2), with 2 minutes recovery between sets. Average power during concentric actions and total work (concentric-eccentric) were measured simultaneously using both systems. Data were analysed using a linear regression analysis and correlation procedures. Strong significant correlations were observed in average power results between both data acquisition systems for all individual inertias and intensities evaluated, as well as for overall data (r=.968; Sig.(2-tailed)=.000; R2=.937). In addition, work values showed clear significant correlations (r=.978; Sig.(2-tailed)=.000; R2=.957). Differences between devices oscillated over a range of 2.6-4.3%. The strong correlations found in power and work values seem to indicate that both data acquisition systems are similar and valid to estimate power and work during resistance exercises employing flywheel inertial technology. Thus, both devices may represent a helpful tool to control and follow up training using flywheel technology.
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Kushwaha, Prabhakar, Sanjoy K. Ghoshal, and Kabir Dasgupta. "Dynamic analysis of a hydraulic motor drive with variable inertia flywheel." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 234, no. 6 (September 25, 2019): 734–47. http://dx.doi.org/10.1177/0959651819875914.

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A flywheel is presented in this article, which can adaptively generate variable inertia in response to the application requirements in a hydraulic drive. The said flywheel consists of four sliders in the guide track of a host flywheel frame which change its position as the rotational speed of the flywheel varies. The varying distance between the slider and the center of rotation leads to a variable inertial mass. This passive inertial mass has a potential to reduce the speed fluctuations of the drive. A comparative study has been made on the effects of the variable inertia flywheel on the hydraulic motor speed fluctuations with that of the fixed inertia flywheel. In this respect, a bond graph model of the hydraulic motor drive with the variable inertia flywheel and the fixed inertia flywheel is developed to analyze their performances. The variable inertia generated by the variable inertia flywheel reduces the hydraulic motor speed fluctuations in response to the changes in the excitation inputs. The tests were conducted to validate the model for step change in speed of the hydraulic motor. The test results of the hydraulic motor speed response are found in good agreement with the predicted response. The proposed design of the flywheel reduces the peak speed of the hydraulic motor that enhances the reliability and performance of the drive.
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Ibrahim, Ismail, Cathal O’Loughlin, and Terence O’Donnell. "Virtual Inertia Control of Variable Speed Heat Pumps for the Provision of Frequency Support." Energies 13, no. 8 (April 11, 2020): 1863. http://dx.doi.org/10.3390/en13081863.

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The growth in the integration of converter interfaced renewable energy has reduced the system inertia, which threatens system stability due to high rate of change of frequency (RoCoF) and frequency nadir issues unless steps are taken to mitigate it. There is a need to provide sufficient fast frequency response to maintain adequate inertia in the system. This paper investigates the capabilities of a variable speed heat pump to provide an emulated inertial response. This paper presents a virtual synchronous machine control for a variable speed heat pump that provides support for grid frequency regulation over the inertial response time frame. A small-signal model with the transfer function of the variable speed heat pump is developed to analyse the effectiveness and feasibility of providing virtual inertia at the device and grid level, respectively. Furthermore, the small-signal model is validated using hardware in the loop simulation. Finally, the aggregated frequency response and virtual inertia contribution by a population of the heat pumps are evaluated and quantified in an urban distribution system.
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Mujcinagic, Alija, Mirza Kusljugic, and Emir Nukic. "Wind Inertial Response Based on the Center of Inertia Frequency of a Control Area." Energies 13, no. 23 (November 24, 2020): 6177. http://dx.doi.org/10.3390/en13236177.

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As a result of the increased integration of power converter-connected variable speed wind generators (VSWG), which do not provide rotational inertia, concerns about the frequency stability of interconnected power systems permanently arise. If the inertia of a power system is insufficient, wind power plants’ participation in the inertial response should be required. A trendy solution for the frequency stability improvement in low inertia systems is based on utilizing so-called “synthetic” or “virtual” inertia from modern VSWG. This paper presents a control scheme for the virtual inertia response of wind power plants based on the center of inertia (COI) frequency of a control area. The PSS/E user written wind inertial controller based on COI frequency is developed using FORTRAN. The efficiency of the controller is tested and applied to the real interconnected power system of Southeast Europe. The performed simulations show certain conceptual advantages of the proposed controller in comparison to traditional schemes that use the local frequency to trigger the wind inertial response. The frequency response metrics, COI frequency calculation and graphical plots are obtained using Python.
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Li, Zhiyong, Rui Cui, Li Li, Yingli Hu, and Ruwan Ranasinghe. "Inertia Stages and Tourists' Behavior." International Journal of Tourism and Hospitality Management in the Digital Age 2, no. 1 (January 2018): 1–17. http://dx.doi.org/10.4018/ijthmda.2018010101.

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This article integrates the concept of inertia into a tourism context to understand how repeat visitors act and make revisit decisions. Moderating effect of zone of tolerance (ZOT), switching barriers (SWI) and external opportunity (OPP) on the sequential development of inertial behavior was analyzed through 518 tourists. Findings confirm that cognitive inertia (COGI) and affective inertia (AFFI) are significantly and positively related to conative inertia (CONI), while conative inertia also has a direct effect on determining action inertia (ACTI). The tests of moderating effects of zone of tolerance, switching barriers and external opportunity on the sequential development of inertial behavior show these variables have a significant moderating effect on the sequential development of inertia, except for the relation between switching barriers and affective inertia acting together, and conative inertia. These findings provide valuable insights that enable one to understand tourists' revisit behaviors. Theoretical and empirical implications are discussed, for the purpose of advancing tourism marketing discourse.
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Demeulenaere, B., and J. De Schutter. "Synthesis of Inertially Compensated Variable-Speed Cams." Journal of Mechanical Design 125, no. 3 (September 1, 2003): 593–601. http://dx.doi.org/10.1115/1.1582502.

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Traditionally, cam-follower systems are designed by assuming a constant camshaft speed. Nevertheless, all cam-follower systems, especially high-speed systems, exhibit some camshaft speed fluctuation (despite the presence of a flywheel) which causes the follower motions to be inaccurate. This paper therefore proposes a novel design procedure that explicitly takes into account the camshaft speed variation. The design procedure assumes that (i) the cam-follower system is conservative and (ii) all forces are inertial. The design procedure is based on a single design choice, i.e., the amount of camshaft speed variation, and yields (i) cams that compensate for the inertial dynamics for any period of motion and (ii) a camshaft flywheel whose (small) inertia is independent of the period of motion. A design example shows that the cams designed in this way offer the following advantages, even for non-conservative, non-purely inertial cam-follower systems: (i) more accurate camshaft motion despite a smaller flywheel, (ii) lower motor torques, (iii) more accurate follower motions, with fewer undesired harmonics, and (iv) a camshaft motion spectrum that is easily and robustly predictable.
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SITIONON, Gossouhon, Adama COULIBALY, and Jérome Kablan ADOU. "Numerical Study of Spurious Inertial Modes in Shallow Water Models for a Variable Bathymetry." Journal of Mathematics Research 11, no. 6 (November 13, 2019): 58. http://dx.doi.org/10.5539/jmr.v11n6p58.

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In this study we perform a modal analysis of the linear inviscid shallow water equations using a non constant bathymetry, continuous and discontinuous Galerkin approximations. By extracting the discrete eigenvalues of the resulting algebraic linear system written on the form of a generalized eigenvalue / eigenvector problem we first show that the regular variation of the bathymetry does not prevent the presence of spurious inertial modes when centered finite element pairs are used. Secondly, we show that such spurious modes are not present in discontinuous Galerkin discretizations when all variables are approximated in the same descrete space. Such spurious inertial modes have been found very damageable for the quality of inertia-gravity and Rossby modes in ocean modelling.
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Ruffatto III, Donald, Chenghui Nie, and Matthew Spenko. "The VIV: A Mobile Ground Robot with Variable Inertial Properties." Journal of the Robotics Society of Japan 32, no. 4 (2014): 329–32. http://dx.doi.org/10.7210/jrsj.32.329.

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Gao, Kun, and Lijun Sun. "Incorporating Inertia in Mode Choice and Influential Factors of Car Stickiness: Implications for Shifts to Public Transit." PROMET - Traffic&Transportation 30, no. 3 (June 18, 2018): 293–303. http://dx.doi.org/10.7307/ptt.v30i3.2507.

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To explore efficient strategies of adjusting travel mode structure and support scientific implements of public transit system, this paper investigated travelers’ mode choice behavior in a multimodal network incorporating inertia in utility specifications. Comprehensive stated preference surveys considering four modes and four key decisive variables were designed, and face-to-face investigations were conducted to collect reliable data in Shanghai. The discrete choice technique considering mode-specific inertias was employed for modeling. The influencing factors of car stickiness were particularly explored. The results show that there are significant and mode-specific inertias in travelers’ choices of travel mode. The inertia of car users shifting to other modes is considerably large compared to inertias of public transit users. Travel time reliability and crowdedness in public transit are identified to be crucial factors influencing car users’ willingness to use public transit. Demographic attributes (age, income, education level and gender), spatial context features (commuting duration) and the regime of flexible work time are found to be significant influential variables of car stickiness. Moreover, direct and cross elasticity analyses were executed to show practical implications of shifting car users to public transit. The results provide serviceable support for transport planning and strategy making.
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Dong, Xiaomin, Jun Xi, Pinggen Chen, and Wenfeng Li. "Magneto-rheological variable inertia flywheel." Smart Materials and Structures 27, no. 11 (October 15, 2018): 115015. http://dx.doi.org/10.1088/1361-665x/aad42b.

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Dissertations / Theses on the topic "Inerzia variabile"

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Fantoni, Maria Elena. "Stima dei parametri di cinematismi ad inerzia variabile." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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Elaborazione di un algoritmo per la stima della curva dell'inerzia e della sua derivata (in caso di inerzia variabile) di un cinematismo a partire dai dati misurati dal controllore relativi a posizione angolare, velocità, accelerazione e corrente. Indagine teorica e sperimentazione su banco di prova con dati reali.
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Idini, Adriano. "Influenza del circuito di distribuzione di un impianto a pompa di calore sulle prestazioni energetiche e sul comfort termico percepito in una palazzina uffici." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Nel presente lavoro di tesi è stato effettuato lo studio di un impianto di riscaldamento basato su pompa di calore aria-acqua multi-compressore al servizio della palazzina uffici della società Galletti S.p.a. allo scopo di individuare la configurazione idraulica ottimale del circuito di distribuzione che garantisca il miglior compromesso tra le prestazioni energetiche dell’impianto ed il comfort termoigrometrico percepito all’interno dell’edificio. L’analisi sviluppata durante questo lavoro si è basata sui risultati di simulazioni dinamiche condotte per mezzo del software TRNSYS (TRaNsient System Simulation): i modelli implementati all’interno del software hanno permesso di valutare il comportamento del sistema edificio-impianto tenendo conto della reale dinamica del sistema in corrispondenza di fenomeni transitori caratteristici di impianti a pompa di calore: cicli di accensione-spegnimento e cicli di defrost. In particolare, sono state valutate differenti configurazioni del circuito di distribuzione idraulica al fine di trovare la soluzione ottimale per massimizzare le prestazioni energetiche dell’impianto, minimizzare lo stress meccanico della pompa di calore ed ottimizzare il comfort termico interno agli ambienti climatizzati. A tal fine, sono state considerate diverse logiche di gestione della portata d’acqua (fissa o variabile), legate a diversi terminali di emissione (fan-coil dotati di valvole a 3 vie di by-pass o di valvole a 2 vie on-off), ed è stata variata la taglia e la posizione del serbatoio di accumulo inerziale del sistema, allo scopo di investigare l’influenza dell’inerzia termica del circuito sul comportamento dell’impianto.
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Pauvert, Vincent. "Conception et optimisation d'actionneurs électromécaniques pour l'obtention d'une inertie variable." Nantes, 2007. http://www.theses.fr/2007NANT2163.

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Dans le cadre des efforts effectués pour la réduction des émissions de CO2 des véhicules automobiles, ce travail présente la conception d'un volant moteur à inertie variable. Initialement, le volant moteur est une inertie située sur le vilebrequin du moteur d'un véhicule. Son rôle dans la chaîne cinématique consiste à filtrer la vitesse du moteur car le couple qu'il génère est très irrégulier dû aux phases de compressions et de combustions. Le principe de variation d'inertie consisterait alors à désolidariser une partie de l'inertie du volant lors des phases d'accélération du véhicule. Le moteur ayant une inertie en moins à mettre en rotation, une économie d'énergie significative pourrait être réalisée. La solution de volant à inertie variable étudiée de deux volants, l'un dit « fixe » complètement solidaire du vilebrequin qui représente alors la partie constante de l'inertie, l'autre « dit mobile » connectable et déconnectable du vilebrequin qui représente alors la partie variable de l'inertie. Deux solutions d'accrochage mécaniques sont présentées, capable de solidariser les volants en rotation malgré l'importance du couple instantané : la première consiste à embrayer le volant mobile sur le volant fixe à l'aide d'une garniture de friction, la seconde utilise un crabot, soit un verrouillage mécanique réalisé avec des dentures. Pour l'embrayage des volants, un actionneur de séparation réluctant à bobinage et un actionneur de plaquage réluctant à aimants sont modélisés analytiquement par des circuits aux reluctances, validés expérimentalement et optimisés. Pour le déplacement du crabot, un actionneur électromagnétique linéaire est dimensionné et validé expérimentalement
Within the framework of the efforts made to reduce the CO2 emission of motor vehicles, this paper presents the conception of a flywheel with a variable inertia. Usually, the flywheel is an inertia standing on the crankshaft of the engine of a vehicle. Its function in the cinematic chain is to filter the speed of the engine because the torque which is generated is very irregular due to the phases of compression and combustion. The principle of the variation of inertia would consist in decreasing a part of the inertia of the flywheel during the phases acceleration of the vehicle. The engine having less inertia to put in rotation, a significant energy saving could be realized. The solution of variable inertia flywheel studied involves two wheels, one called « steady » permanently bound to the crankshaft, which then represents the constant part of the inertia, and the other one called « mobile » that can be connected to and disconnected from the crankshaft which then represents the variable part of the inertia. Two solutions to realize the mechanical binding are presented, capable of keeping the flywheel connected in rotation in spite of the importance of the instant torque : the first one consists in clutching the mobile wheel in the steady one by means of a friction lining, the second uses a dog clutch, which is a mechanical locking realized with a set of teeth. For the clutching of the wheels, a reluctant separation actuator made of coils and a binding actuator made of magnets are analytically modelled with reluctance circuits, then experimentally validated and optimized. For the movement of the dog clutch, a linear electromagnetic actuator is sized and experimentally validated
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EL, Itani Samer. "Short-term frequency support utilizing inertial response of variable-speed wind plants." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104853.

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In regions with increasing penetration of variable-speed wind generators, grid operators are concerned about frequency security as system inertia is decreasing. The partial replacement of conventional plants with modern wind plants may cause system frequency regulation to fall below acceptable levels, especially in isolated power systems. This study investigates the contribution of variable-speed wind generators to short-term frequency support. This contribution is obtained by transiently releasing part of the stored kinetic energy in the turbine blades, namely the inertial response. Some inertial response schemes have been researched to be incorporated as auxiliary loops in the controllers of wind generators. First, we compare the performance of these earlier implementations and identify their shortcomings. Then, we quantify the extractable inertial power from a modern wind turbine, given its power characteristic, equivalent inertia, and prevailing wind condition. From this understanding, a new controller, based on the asynchronous release of kinetic energy, is proposed to achieve a superior, more controllable performance. The controller is composed of a 'detection and triggering' scheme that detects the frequency event, a 'power shaping' function that decides the duration and amount of inertial power released, and a 'rotor speed recovery' scheme that brings the turbine back to its optimal speed which corresponds to maximum power tracking. Time-domain simulations were performed to examine the performance of this controller. Based on its impact on system frequency and wind farm operation, the new controller was compared to earlier implementations of wind plant inertial response. The results show that the proposed controller is capable of bringing together the advantages of the different earlier implementations for better grid integration of wind turbine generators. Its effectiveness in reducing the initial frequency fall after a load-generation mismatch promises significant contribution to system inertia. Its controllable, predictable nature is a distinct advantage that enables grid operators to understand, forecast and quantify the impact of incorporating this controller into grid-connected wind generators.
Dans les régions à forte pénétration d'éoliennes à vitesse variable, les opérateurs de réseau sont concernés par la sécurité de la fréquence lorsque l'inertie du système décroît. La substitution partielle d'usines conventionnelles par des usines éoliennes modernes pourrait causer le réglage de la fréquence du système à chuter sous des niveaux acceptables, surtout dans le cas de systèmes d'alimentation isolés. Cette étude se penche sur comment les éoliennes à vitesse variable peuvent contribuer au support de la fréquence à court terme. Cette contribution est obtenue grâce au relâchement transitoire d'une partie de l'énergie cinétique contenue dans les aubes de turbine, plus spécifiquement la réponse transitoire. Quelque programmes de réponse inertielle ont été étudiés afin d'être incorporés comme boucle auxiliaire dans les contrôles des génératrices à vent. En premier lieu, on compare la performance d'implémentations préexistantes entre-elles afin d'en identifier les défauts respectifs. En second lieu, on quantifie la puissance inertielle capable d'être extraite d'une génératrice à vent moderne tout en prenant en considération les caractéristiques de puissance, son inertie équivalente ainsi que les conditions de vent dominantes. Avec cette notion, un nouveau régulateur qui est basé sur un relâchement non-synchronisé d'énergie cinétique est proposé afin d'obtenir une performance supérieure et plus contrôlable. Le contrôleur est composé d'un programme de «détection et déclenchement» qui détecte la variation de la fréquence, d'une fonction «formatrice de puissance» qui calcule la durée ainsi que la quantité de puissance cinétique relâchée, et d'un programme de «récupération de vitesse du rotor» qui ramène la turbine à sa vitesse optimale qui correspond au suivi de la vitesse maximale. Des simulations dans le domaine du temps ont été effectuées afin d'examiner la performance du régulateur. À partir de son impact sur la fréquence du système et l'opération de plants éolien, le nouveau contrôleur a été comparé aux implémentations antérieures de réponse inertielle d'usines de vent. Les résultats démontrent que le contrôleur proposé est capable d'unifier les avantages des implémentations précédentes afin d'avoir une meilleure intégration des éoliennes. Sa capacité de réduire la chute de fréquence initiale qui suit un décalage au niveau de la génération de charge promet une contribution significative sur l'inertie du système. En fait, sa nature contrôlable et prévisible lui donne un avantage distinct qui permet aux opérateurs de réseau de pouvoir comprendre, prédire et quantifier l'impact potentiel de l'implémentation de ce régulateur dans des génératrices à vent connectées au réseau.
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Xu, Tongyi. "Design and Analysis of a Shock Absorber with a Variable Moment of Inertia Flywheel for Passive Vehicle Suspension." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/26293.

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Conventional vehicle suspensions consist of a spring and a damper, while mass is rarely used. A mass, if properly used, can also create a damping-like effect. However, a mass has only one terminal which makes it difficult to be incorporated into a suspension. In order to use a mass to achieve the damping-like effect, a two-terminal mass (TTM) has to be designed. However, most of the reported TTMs are of fixed moment of inertia (TTM-CMI), which limits the further improvement of the suspension performance and responsiveness to changes in environment and driving conditions. In this study, a TTM-based vibration absorber with variable moment of inertia (TTM-VMI) is proposed. The main component of the proposed TTM absorber contains a hydraulic-driven flywheel with sliders. The moment of inertia changes with the positions of the sliders in response to the driving conditions. The performance of the proposed TTM-VMI absorber has been analyzed via dynamics modeling and simulation and further examined by experiments. The analysis results indicate that the TTM-VMI absorber outperforms the TTM-CMI design in terms of body displacement; and ride comfort, tire grip and suspension deflection for zero and impulse inputs with comparable performance for sinusoidal input.
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Pearson, Stephen John. "An investigation of dynamic human muscle function using a variable inertial loading system." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398046.

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Petré, Henrik. "Svänghjulstränings inverkan på styrkerelaterade variabler - en metaanalys." Thesis, Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-4551.

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Syfte och frågeställning Syftet med denna studie är att identifiera effekten av svänghjulsträning på styrkerelaterade variabler som påverkar idrottslig prestation genom en sammanställning av befintlig vetenskaplig litteratur. Studiens frågeställning var: (1) Vilken effekt har svänghjulsträning på muskeltillväxt (hypertrofi)? (2) Vilken effekt har svänghjulsträning på utvecklingen av maximal styrka? (3) Vilken effekt har svänghjulsträning på utvecklingen av Power (effektutveckling)? (4) Vilken effekt har svänghjulsträning på horisontell förflyttning? (5) Vilken effekt har svänghjulsträning på vertikal förflyttning? Metod En metaanalys för 15 experimentella studier som uppfyllt urvalskriterierna genomfördes. De inkluderade studierna kvalitetsgranskades med Pedros skala. För att möjliggöra en sammanställning av samtliga resultat analyserades resultaten i dataprogrammet Review Manager version 5.3 med Random effekt modell och presenteras med Forest plots. Jämförelserna gjordes över en period på 4-24 veckor. Resultat Svänghjulsträning under en period av 4-24 veckor visar på en statistisk signifikant utveckling  av muskulär hypertrofi (effektstorlek 0,68), maximal styrka (1,40), Power (1,0), horisontell (0,54) och vertikal förflyttning (0,60). Slutsats Det finns stöd i litteraturen för att friska individer presterar bättre på så väl dynamiska styrketest som funktionella test efter svänghjulsträning. Evidensen är särskilt stark för att svänghjulsträning utvecklar maximal styrka och Power för tränade yngre individer samt i kortare mer intensiva block. Denna metaanalys har bara sammanställt skillnader i prestation före och efter svänghjulsträning och kan därför inte säga om effekten av svänghjulsträning är större än effekten av upprepade mätningar eller annan träning.
Aim The aim of this study was to identify the effect of the flywheel training on strength-related variables that affect athletic performance by compiling existing scientific literature. Research questions: (1) What effect does flywheel training have on muscle growth (hypertrophy)? (2) What effect does flywheel training have on the development of maximum strength? (3) What effect does flywheel training have on the development of Power (effect development)? (4) What effect does flywheel training have on the development of horizontal movement? (5) What effect does flywheel training have on the development of vertical movement? Method A meta-analysis was conducted from 15 experimental studies that met the selection criteria. The quality of included studies was reviewed by Pedro scale. In order to identify possible bias in the selection process a Funnel plot was carried out. To enable the compilation of all results an analyze with Random effect model was carried out with software Review Manager Version 5.3 and presented with Forest plots. Comparisons were made over a period of 4-24 weeks. Results Flywheel training for a period of 4-24 weeks show a statistically significant increase in effect size for muscular hypertrophy (0,49), maximum strength (1,40), Power (1,00), horizontal-(0,54) and vertical movement (0,60). Conclusions There's support in published studies that healthy individuals perform better on dynamic strength tests as wells as functional test after flywheel training. The evidence is particularly strong that flywheel training develops maximum strength and Power in trained younger individuals and in shorter more intensive blocks. This meta-analysis has just compiled the differences in performance before and after flywheel training and therefore cannot say if the effect of flywheel training is greater than the effect of repeated measurements or other exercise.
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Larrea, Moraga Raimundo Enrique. "Análisis de la respuesta en frecuencia en sistemas de potencia con altos niveles de generación variable sin inercia." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/137574.

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Ingeniero Civil Eléctrico
Diferentes países alrededor del mundo se han planteado ambiciosos objetivos para alcanzar altos niveles de producción de energía en base a energías renovables en los próximos años. Esta situación, sumada a condiciones favorables desde el punto de vista de costos de inversión tanto para los proyectos de generación fotovoltaica como eólica, lleva a que se espere que ambas tecnologías tengan un rol importante en los sistemas de potencia del futuro. Sin embargo, una alta penetración de energías renovables no convencionales puede afectar el control y estabilidad de un sistema de potencia, especialmente desde el punto de vista de la frecuencia. Esto, ya que la generación variable desplaza generación síncrona convencional. Lo anterior provoca problemas, entre otras cosas, con la inercia del sistema debido a dos factores: 1) las plantas fotovoltaicas no poseen partes rotatorias, por lo tanto no pueden proveer de respuesta inercial durante desbalances de carga-generación y 2) la generación eólica al ser conectada mediante conversor, pierde la respuesta inercial natural asociada a sus partes giratorias. Como consecuencia, mientras más plantas eólicas y solares fotovoltaicas se integren al sistema, más reducida será la inercia del mismo y con esto su capacidad de hacer frente a las desviaciones de frecuencia ante grandes perturbaciones, lo que afecta fuertemente la estabilidad en frecuencia. Es por esto que con el fin de permitir altos niveles de energía renovable no convencional (ERNC) manteniendo la seguridad del sistema, se requiere incluir en el Unit Commitment restricciones adicionales. Los efectos mencionados son relevantes en sistemas de potencia aislados y pequeños. En el caso chileno el Sistema Interconectado del Norte Grande (SING) tiene proyectada una alta penetración de proyectos fotovoltaicos sin inercia. Por lo anterior, este trabajo se enfoca en estudiar la estabilidad de frecuencia del SING proyectado para el año 2017. El objetivo es encontrar funciones que caractericen la respuesta de la frecuencia del sistema frente a desbalances de carga-generación. Para ello, se realizan simulaciones dinámicas frente distintas contingencias en base a un modelo proyectado del SING. Los resultados del estudio indican que a medida que aumenta la generación variable, el sistema ve deteriorada su capacidad de control de frecuencia. Además se concluye una alta correlación entre el porcentaje de generación ERNC y la inercia del sistema y a su vez una estrecha correlación entre el rate of change of frecuency (Rocof) y la inercia del sistema. Esto último permite representar de forma matemática la relación entre el Rocof y la inercia del sistema. Finalmente el trabajo entrega una función por tramos que caracteriza la pendiente de caída de la frecuencia (Rocof), en función del desbalance, para diferentes valores de inercia del sistema. Se prueba la validez de la función obtenida con fallas históricas reales ocurridas en el SING para validar la propuesta. De esta forma se podría incorporar una restricción adicional al Unit Commitment para caracterizar la influencia de una alta penetración de ERNC en la frecuencia del sistema.
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CUNHA, JOAO MARCO BRAGA DA. "EXPERIMENTS ON FORECASTING THE AMERICAN TERM STRUCTURE OF INTEREST RATES: MEAN REVERSION, INERTIA AND INFLUENCE OF MACROECONOMIC VARIABLES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=14308@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
Este trabalho propõe um modelo com reversão à média e inércia para taxas de juros e para cargas dos fatores de Nelson e Siegel (1987), e adiciona variáveis macroeconômicas selecionadas. As previsões geradas são comparadas com o Passeio Aleatório e com a metodologia de Diebold e Li (2006).
This work proposes a model with mean reversion and inertia for the yields and the loadings of the Nelson and Siegel (1987) factors, and includes selected macroeconomic variables. The generated forecasts are compared with the Random Walk and the Diebold e Li (2006) methodology.
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Ferreira, de Sousa Marcus Alexandre. "Contribution à la conception de lois de commande à caractère robuste pour une machine synchrone entraînant une charge élastique à inertie variable." Phd thesis, Toulouse, INPT, 2007. http://oatao.univ-toulouse.fr/7601/1/ferreira.pdf.

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Le but de ce travail est de définir les règles de synthèse de différentes lois de commande afin de leur donner un caractère robuste. Nous étudions la problématique du contrôle d'un actionneur synchrone en présence d'une charge mécanique. Cette charge est entraînée par un accouplement élastique et présente une valeur d'inertie variable et bornée. La synthèse de correcteurs simples est présentée et des méthodes pour obtenir le meilleur correcteur sur l'intervalle de variation des paramètres sont presentées. Nous avons présenté dans ce travail, les règles de synthèse d'un régulateur PID sur lequel nous avons ajouté une méthode itérative d'optimisation basée sur l'expertise du comportement du système ainsi qu'un algorithme génétique. Cette partie a permis de donner des règles simples de synthèse et de paramétrisation de la méthode d'optimisation afin de trouver les 3 degrés de liberté de correction optimaux. La synthèse de correcteurs dans l'espace d'état a ensuite été abordée en étudiant le meilleur placement de pôle en fonction de l'élasticité et de la variation d'inertie. La méthode de synthèse par optimisation d'un critère quadratique intégrale (LQI) est largement presentée. Cette partie permet de donner les lignes directrices et les critères à choisir pour obtenir un placement de pôle respectant au mieux le cahier des charges et un comportement robuste aux variations de paramètres. L'étude de la méthode LQI à 3 degrés de liberté à permis de lier la valeur des coefficients aux pôles et au comportement du système en boucle fermée. Une deuxième méthode de synthèse par optimisation LQI permet de définir les gains du régulateur à partir d'un placement de pôles souhaité. Toutes ces structures de contrôle ont été vérifiées en simulation en tenant compte du pilotage de la machine synchrone au travers de son convertisseur statique. Les boucles internes de gestion des rapports cycliques et des boucles de courant sont présentées de manière à expliquer certain phénomène et afin de fixer correctement les dynamiques internes souvent négligées. Ces correcteurs ont ensuite été implanté dans un environnement dSPACE, sur un banc d'essai constitué d'un convertisseur MLI, d'un actionneur synchrone autopiloté entraînant une charge mécanique identique au problème évoqué présentant un accouplement élastique et des disques additionnels permettant la variation d'inertie. Une extension vers des correcteurs plus avancés sont présentés en mettant l'accent sur les difficultés qui apparaissent pour la représentation des systèmes (mathématique et forme augmentée pour les approches H1, LMI, réduction de modèle, etc) sur la complexité des méthodes de recherche de solution (Riccati, inégalités matricielles contraintes, etc). Finalement une perspective mélangeant l'effet des correcteurs et des observateurs est brièvement présentée au travers de la méthode LQI et d'un observateur d'état et de perturbation. Des résultats de simulation et d'expérimentation encourageants sont également présentés tout en conservant des règles de synthèse simples et liées à la connaissance du comportement du système.
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Books on the topic "Inerzia variabile"

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Alyukov. Dynamics of inertial continuously variable automatic transmissions. Infra-M Academic Publishing House, 2013. http://dx.doi.org/10.12737/1584.

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Moosavi-Rad, Hamid. The application of a band variable-inertia flywheel to an urban transit bus. 1988.

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Book chapters on the topic "Inerzia variabile"

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Ostalczyk, Piotr, and Dorota Mozyrska. "Variable-, Fractional-Order Inertial Element." In Lecture Notes in Electrical Engineering, 77–87. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45474-0_8.

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Han, Minyeon, and F. C. Park. "Variable Inertia Muscle Models for Musculoskeletal Dynamics." In Advances on Theory and Practice of Robots and Manipulators, 321–29. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07058-2_36.

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Peressini, C., A. L. Guzzomi, and D. C. Hesterman. "Torsional Receptances and Variable Inertia of a Two-Inertia Model of a Universal Joint." In New Trends in Mechanism and Machine Science, 577–85. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4902-3_61.

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Zhao, Mengying, Yuqi Ni, Tao Chao, and Ke Fang. "An Inertia Weight Variable Particle Swarm Optimization Algorithm with Mutation." In Sensor Networks and Signal Processing, 269–80. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4917-5_21.

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Ramos, C., C. A. Collazos, and A. Maldonado. "Acquisition of Lower Limb Joint Variables by an Inertial Card System." In VII Latin American Congress on Biomedical Engineering CLAIB 2016, Bucaramanga, Santander, Colombia, October 26th -28th, 2016, 369–72. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4086-3_93.

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Gao, Le, Guoxing Yu, Lan Liu, and Huihui Song. "Inertial Response Control Strategy of Wind Turbine Based on Variable Universe Fuzzy Control." In Communications in Computer and Information Science, 52–62. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6364-0_6.

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Platz, Roland. "Approach to Assess Basic Deterministic Data and Model Form Uncertaint in Passive and Active Vibration Isolation." In Lecture Notes in Mechanical Engineering, 208–23. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77256-7_17.

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AbstractThis contribution continues ongoing own research on uncertainty quantification in structural vibration isolation in early design stage by various deterministic and non-deterministic approaches. It takes into account one simple structural dynamic system example throughout the investigation: a one mass oscillator subject to passive and active vibration isolation. In this context, passive means that the vibration isolation only depends on preset inertia, damping, and stiffness properties. Active means that additional controlled forces enhance vibration isolation. The simple system allows a holistic, consistent and transparent look into mathematical modeling, numerical simulation, experimental test and uncertainty quantification for verification and validation. The oscillator represents fundamental structural dynamic behavior of machines, trusses, suspension legs etc. under variable mechanical loading. This contribution assesses basic experimental data and mathematical model form uncertainty in predicting the passive and enhanced vibration isolation after model calibration as the basis for further deterministic and non-deterministic uncertainty quantification measures. The prediction covers six different damping cases, three for passive and three for active configuration. A least squares minimization (LSM) enables calibrating multiple model parameters using different outcomes in time and in frequency domain from experimental observations. Its adequacy strongly depends on varied damping properties, especially in passive configuration.
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Zhavner, Victor L., Wen Zhao, Chuanchao Yan, and Long Wu. "Research and Development of a Spring Drive with Recovery Energy in the Presence of a Variable Inertial Load." In Advances in Mechanical Engineering, 209–20. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39500-1_21.

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Negrini, Stefano, Mauro Serpelloni, Cinzia Amici, Massimiliano Gobbo, Clara Silvestro, Riccardo Buraschi, Alberto Borboni, Diego Crovato, and Nicola Francesco Lopomo. "Use of Wearable Inertial Sensor in the Assessment of Timed-Up-and-Go Test: Influence of Device Placement on Temporal Variable Estimation." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 310–17. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58877-3_40.

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Orozco-Soto, S. M., A. I. Pérez-Sanpablo, P. Vera-Bustamante, and J. M. Ibarra-Zannatha. "Development of a Visual-Inertial Motion Tracking System for Muscular-Effort/Angular Joint-Position Relation to Obtain a Quantifiable Variable of Spasticity." In Biosystems & Biorobotics, 210–15. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01887-0_41.

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Conference papers on the topic "Inerzia variabile"

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Hart, J. Scot, and Gu¨nter Niemeyer. "Wave Variable Based Force Control." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41469.

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Wave variable controllers maintain passive communication across time delays in telerobotics. As passive elements, wave variable controllers interact well with other passive elements, such as P.D. controllers and masses, and use a combination of force and velocity signals to apply force feedback. Currently we are exploring the use of wave variable controllers with large non-backdrivable industrial-type slave devices where dynamics are dominated by inertial and frictional forces. The objective is to integrate force sensor measurements into wave variable controllers to provide low frequency force feedback and hide the slave’s friction and inertia from the user in the presence of a communication time delay. This paper presents and uses a wave variable based approach to design force control. The resulting wave variable based force controller is converted to power variables and shown to be similar to traditional force controllers. A 1-DOF telerobotic system is used to experimentally show the wave variable based force control combines with the enhanced stability properties of the wave communication channel to produce robust slave side force control. The resulting system is better able to maintain force control with rigid environments then a traditional controller both with and without communication time delay.
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Van de Ven, James. "Fluidic Variable Inertia Flywheel." In 7th International Energy Conversion Engineering Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-4501.

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Laliberté, Thierry, and Clément Gosselin. "Dynamic Balancing of Two-DOF Parallel Mechanisms Using a Counter-Mechanism." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12107.

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Dynamic balancing generally involves the static balancing of a mechanism using countermasses followed by the dynamic balancing of the inertia using counter-rotations. This approach requires that the statically balanced mechanism have a constant inertia for any configuration. Two of the main drawbacks of dynamic balancing are a significant increase in mass and actuation inertia. In this paper, static balancing strategies are optimized regarding the addition of mass and actuation inertia using Lagrange multipliers. The results are optimal mass-inertia curves which are akin to Pareto curves. Optimal static balancing rules are obtained and a comparison of balancing strategies shows that relaxing the constant inertia constraint may significantly reduce the total mass and actuation inertia. Then, a counter-mechanism is introduced in order to dynamically balance a mechanism with variable inertia. The conditions for which the counter-mechanism matches the inertia of the main mechanism for any configuration are derived. The significant influence of the radius of gyration of the counter-inertias on the optimal mass-inertia curves is revealed. Additionally, the advantages of counter-mechanisms over counter-rotations are demonstrated. Finally, examples of dynamically balanced mechanisms and a prototype are presented in order to illustrate the concepts.
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Matsuoka, Taichi, Kazuhiko Hiramoto, Katsuaki Sunakoda, and Naoto Abe. "Variable Inertia Damper Using MR Fluid." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63007.

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Inertia damper has an inertia effect by a flywheel which is caused by a quick moving mass. In general, it is difficult to change the inertia mass physically. In order to obtain a variable inertia effect, a new type of inertia damper has a long bypass pipe is proposed in this paper. This type of damper generates a damping effect and inertia effect by the fluid. It is noted that the inertia effect is depended on a density of the fluid, cross sectional areas of cylinder and bypass pipe, and length of the bypass pipe. If the diameter of the bypass pipe can be controlled, it means that a cross sectional area of the bypass pipe can be switched by clustering particles of MR fluid under magnetization, the inertia effect might be artificially controllable. A trial damper with several electromagnets installed along the long bypass pipe is manufactured, and dynamic property is measured when MR fluid inside the bypass pipe is magnetized by the electromagnets. From experimental results, it seems to be that the inertia effect can be switched and depended on amplitude of magnetization. Finally, the calculated results are theoretically approached, and compared with the experimental results.
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Persson, Mattias, Peiyuan Chen, and Ola Carlson. "Inertia support during variable wind conditions." In 2016 IEEE Electrical Power and Energy Conference (EPEC). IEEE, 2016. http://dx.doi.org/10.1109/epec.2016.7771696.

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Dresscher, Douwe, Theo J. A. de Vries, and Stefano Stramigioli. "Inertia-Driven Controlled Passive Actuation." In ASME 2015 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/dscc2015-9786.

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A serious problem with using electrical actuators in legged locomotion is the significant energy loss. For this reason, we propose and analyse an alternative means of actuation: Controlled Passive Actuation. Controlled Passive Actuation aims at reducing the energy flow through electric actuators by actuating with a combination of an energy storage element and a Continuously Variable Transmission. In this work, we present a method where we apply a Continuously Variable Transmission with a storage element in the form of a mass to change the state of another mass (“the load”). An abstraction layer is created to abstract the inertia-driven Controlled Passive Actuation to a source of effort, a force actuator. On this abstracted system, feedback control can be applied to achieve control goals such as path tracking. With simulations and experiments, we show that inertia-driven Controlled Passive Actuation can be used to control the state of an (inertial) load. The experimental results show that the performance of the system is affected by the internal dynamics and limited rate of change of the transmission ratio of the Continuously Variable Transmission.
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Biao Lu, Yongchun Fang, and Ning Sun. "Global stabilization of inertia wheel systems with a novel sliding mode-based strategy." In 2016 14th International Workshop on Variable Structure Systems (VSS). IEEE, 2016. http://dx.doi.org/10.1109/vss.2016.7506916.

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Shammas, Elie A., Howie Choset, and Alfred A. Rizzi. "Motion planning for variable inertia mechanical systems." In Defense and Security Symposium, edited by Grant R. Gerhart, Charles M. Shoemaker, and Douglas W. Gage. SPIE, 2006. http://dx.doi.org/10.1117/12.662341.

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Matsuoka, Taichi, Naoto Abe, Kazuhiko Hiramoto, and Katsuaki Sunakoda. "Variable Inertia Damper Using MR Fluid: Part II — Improvement of Inertia Effect." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65922.

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The authors have developed fluid inertia damper using MR fluid in order to obtain a variable inertia effect. From the experiments, it seemed to be that the inertia effect was slightly switched, but very small. In this paper, to get much inertia effect, the damper was improved by using long bypass pipe of stainless steel, and 24 electromagnets were installed along the long by-pass pipe. Dynamic property was investigated experimentally and theoretically.
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Berselli, Giovanni, and Jacek S. Stecki. "Kinematic Design and Bond Graph Modeling of an Inertia-Type Infinitely Variable Transmission." In ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49875.

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A fully mechanical infinitely variable transmission (IVT) based on the use of an oscillating inertia is described. The system includes a four-bar linkage mechanism, an epicyclic gear train and a pair of one-way clutches. The proposed IVT can be used in place of both gear-box and clutch in self-propelled vehicles. A basic model is used for a first attempt sizing of the transmission kinematic parameters. A more accurate model, achieved using Bond Graphs, is used to investigate the dynamic effect of inertias, one-way clutch compliance, and minor design changes in the kinematic parameters. Finally, simulations compare the behavior of a car fitted with a manual gear-box and the same car fitted with the proposed IVT.
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