Panel method predictions of added mass for flexible airship

2013 ◽  
Vol 117 (1191) ◽  
pp. 519-531 ◽  
Author(s):  
M. Zhang ◽  
X. Wang ◽  
D. Duan
Keyword(s):  
Membrane Structure ◽  
Dynamic Models ◽  
Mass Matrix ◽  
Added Mass ◽  
Panel Method ◽  
Arbitrary Geometry ◽  
State Equations ◽  
Ellipsoid Of Revolution ◽  
And Control ◽  
Manipulation And Control

Abstract Because of the huge volume and inflated membrane structure of stratosphere airship, the deformation of stratosphere airship is very sensitive to the change of environment conditions such as wind, temperature and so on. The influence of deformation on manipulation and control is very remarkable. So, during the course of building flight dynamic model of the flexible airship, the added-mass matrix of deformation is very important part in the state equations of dynamic models. For obtaining the accurate added-mass matrix of different flexible airship, we proposed an approach that can calculate the added-mass matrix of a flexible airship with arbitrary geometry shape by the panel method. Through the comparison of results of computation and theory for ellipsoid of revolution and the flexible Skyship-500 airship, the proposed method can calculate the added-mass matrix for arbitrary geometric shape very accurately.

The Turing Machine Model of Sensing, Manipulation, and Control

1989 ◽  
Author(s):  
Constantine Tsikos ◽  
Tom Chmielewski ◽  
Brian Frederick
Keyword(s):  
Turing Machine ◽  
Machine Model ◽  
And Control ◽  
Manipulation And Control

Imitation of Demonstrations Using Bayesian Filtering With Nonparametric Data-Driven Models

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Nurali Virani ◽  
Devesh K. Jha ◽  
Zhenyuan Yuan ◽  
Ishana Shekhawat ◽  
Asok Ray
Keyword(s):  
Particle Filtering ◽  
Dynamic Models ◽  
Training Data ◽  
Data Driven ◽  
Conditional Density ◽  
Bayesian Filtering ◽  
State Dependent ◽  
State Evolution ◽  
And Control ◽  
Nonparametric Kernel

This paper addresses the problem of learning dynamic models of hybrid systems from demonstrations and then the problem of imitation of those demonstrations by using Bayesian filtering. A linear programming-based approach is used to develop nonparametric kernel-based conditional density estimation technique to infer accurate and concise dynamic models of system evolution from data. The training data for these models have been acquired from demonstrations by teleoperation. The trained data-driven models for mode-dependent state evolution and state-dependent mode evolution are then used online for imitation of demonstrated tasks via particle filtering. The results of simulation and experimental validation with a hexapod robot are reported to establish generalization of the proposed learning and control algorithms.

Measured Static and Rotordynamic Coefficient Results for a Rocker-Pivot, Tilting-Pad Bearing With 50 and 60% Offsets

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
Chris D. Kulhanek ◽  
Dara W. Childs
Keyword(s):  
Dynamic Stiffness ◽  
Mass Matrix ◽  
Excitation Frequency ◽  
Quadratic Function ◽  
Added Mass ◽  
Damping Coefficients ◽  
Stiffness Coefficients ◽  
Tilting Pad ◽  
Frequency Independent ◽  
Direct Stiffness

Static and rotordynamic coefficients are measured for a rocker-pivot, tilting-pad journal bearing (TPJB) with 50 and 60% offset pads in a load-between-pad (LBP) configuration. The bearing uses leading-edge-groove direct lubrication and has the following characteristics: 5-pads, 101.6 mm (4.0 in) nominal diameter,0.0814 -0.0837 mm (0.0032–0.0033 in) radial bearing clearance, 0.25 to 0.27 preload, and 60.325 mm (2.375 in) axial pad length. Tests were performed on a floating bearing test rig with unit loads from 0 to 3101 kPa (450 psi) and speeds from 7 to 16 krpm. Dynamic tests were conducted over a range of frequencies (20 to 320 Hz) to obtain complex dynamic stiffness coefficients as functions of excitation frequency. For most test conditions, the real dynamic stiffness functions were well fitted with a quadratic function with respect to frequency. This curve fit allowed for the stiffness frequency dependency to be captured by including an added mass matrix [M] to a conventional [K][C] model, yielding a frequency independent [K][C][M] model. The imaginary dynamic stiffness coefficients increased linearly with frequency, producing frequency-independent direct damping coefficients. Direct stiffness coefficients were larger for the 60% offset bearing at light unit loads. At high loads, the 50% offset configuration had a larger stiffness in the loaded direction, while the unloaded direct stiffness was approximately the same for both pivot offsets. Cross-coupled stiffness coefficients were positive and significantly smaller than direct stiffness coefficients. Negative direct added-mass coefficients were obtained for both offsets, especially in the unloaded direction. Cross-coupled added-mass coefficients are generally positive and of the same sign. Direct damping coefficients were mostly independent of load and speed, showing no appreciable difference between pivot offsets. Cross-coupled damping coefficients had the same sign and were much smaller than direct coefficients. Measured static eccentricities suggested cross coupling stiffness exists for both pivot offsets, agreeing with dynamic measurements. Static stiffness measurements showed good agreement with the loaded, direct dynamic stiffness coefficients.

scholarly journals Therapeutic nanomedicine surmounts the limitations of pharmacotherapy

Open Medicine ◽  
2017 ◽  
Vol 12 (1) ◽  
pp. 271-287 ◽  
Author(s):  
Arome Odiba ◽  
Victoria Ottah ◽  
Comfort Ottah ◽  
Ogechukwu Anunobi ◽  
Chimere Ukegbu ◽  
...  
Keyword(s):  
Cytotoxic Effect ◽  
Unique Property ◽  
The Body ◽  
Regulatory Agencies ◽  
Therapeutic Effects ◽  
Genetic Therapy ◽  
Target Drug Delivery ◽  
Target Drug ◽  
And Control ◽  
Manipulation And Control

AbstractScience always strives to find an improved way of doing things and nanoscience is one such approach. Nanomaterials are suitable for pharmaceutical applications mostly because of their size which facilitates absorption, distribution, metabolism and excretion of the nanoparticles. Whether labile or insoluble nanoparticles, their cytotoxic effect on malignant cells has moved the use of nanomedicine into focus. Since nanomedicine can be described as the science and technology of diagnosing, treating and preventing diseases towards ultimately improving human health, a lot of nanotechnology options have received approval by various regulatory agencies. Nanodrugs also have been discovered to be more precise in targeting the desired site, hence maximizing the therapeutic effects, while minimizing side-effects on the rest of the body. This unique property and more has made nanomedicine popular in therapeutic medicine employing nanotechnology in genetic therapy, drug encapsulation, enzyme manipulation and control, tissue engineering, target drug delivery, pharmacogenomics, stem cell and cloning, and even virus-based hybrids. This review highlights nanoproducts that are in development and have gained approval through one clinical trial stage or the other.

Cooperative Object Manipulation and Control

2019 ◽  
pp. 303-346 ◽  
Author(s):  
Dragomir N. Nenchev ◽  
Atsushi Konno ◽  
Teppei Tsujita
Keyword(s):  
Object Manipulation ◽  
And Control ◽  
Manipulation And Control ◽  
Cooperative Object Manipulation

scholarly journals Research and development of Q-Baller -- a spherical wheeled robot

2017 ◽  
Author(s):  
◽  
Jiamin Wang
Keyword(s):  
Control System ◽  
Dynamic Models ◽  
Circuit Board ◽  
Embedded Control ◽  
Wheeled Robot ◽  
Dynamics And Control ◽  
Continuous Gain Scheduling ◽  
Machine Interface ◽  
And Control ◽  
And Robotics

The Spherical Wheeled Robot (Ball-Bot) is a family of robots that can maintain balance standing on a ball and use it as its wheel to move around. In recent years, there have been several successful Ball-Bot designs. We attempt to develop a new spherical wheeled robot product named "Q-Baller" to study its dynamics and control system. The Q-Baller has been designed to ahieve the economic and effective prototyping. A detailed dynamic model of the mechatronic system has been established and analyzed. Control studies have been conducted based on the dynamic models, and new control methods has been proposed to realize continuous gain scheduling. Exclusive simulations have been performed to test the performance of the controllers and reference planning. The Q-Baller hardware has been prototyped and functional. Robotic circuit board, human machine interface and embedded control system have also been developed to make up the full robotic system. The Q-Baller prototype will be tested after the system is fully adjusted, and further researches in control and robotics will be conducted in the future.

scholarly journals The Environment Is Not A System

2018 ◽  
Vol 7 (1) ◽  
pp. 152-165
Author(s):  
Tega Brain
Keyword(s):  
Knowledge Production ◽  
Mass Extinction ◽  
Computational Models ◽  
Rapid Climate Change ◽  
The World ◽  
History Of Ecology ◽  
History Of ◽  
And Control ◽  
Systems View ◽  
Manipulation And Control

This paper considers some of the limitations and possibilities of computational models in the context of environmental inquiry, specifically exploring the modes of knowledge production that it mobilizes. Historic computational attempts to model, simulate and make predictions about environmental assemblages, both emerge from and reinforce a systems view on the world. The word eco-system itself stands as a reminder that the history of ecology is enmeshed with systems theory and presup-poses that species entanglements are operational or functional. More surreptitiously, a systematic view of the environment connotes it as bounded, knowable and made up of components operating in chains of cause and effect. This framing strongly invokes possibilities of manipulation and control and implicitly asks: what should an ecosystem be optimized for? This question is particularly relevant at a time of rapid climate change, mass extinction and, conveniently, an unprecedented surplus of computing.

scholarly journals O Aberto: O Homem e o Animal de Giorgio Agamben – Uma Tentativa Hipertextual/The Open: The man and the animal of Giorgio Agamben - A hypertext attempt

2013 ◽  
Vol 4 (7) ◽  
pp. 1
Author(s):  
Cléber Ranieri Ribas de Almeida
Keyword(s):  
The Political ◽  
Public Order ◽  
Human Sciences ◽  
Giorgio Agamben ◽  
The Public ◽  
Ex Ante ◽  
The Subject ◽  
Definition Of ◽  
And Control ◽  
Manipulation And Control

O artigo se propõe elaborar uma exegese do livro O Aberto: o Homem e o Animal, de Giorgio Agamben, de maneira a expor o argumento central da obra bem como situar o autor na Filosofia Política contemporânea. Para Agamben, o aberto não se situa unicamente numa analítica fenomenológico-existencial do ser: politicamente, o lugar privilegiado de movimentação desse conceito situa-se especificamente na biofilosofia dos graus do orgânico. A definição desses graus torna-se cada vez mais imprecisa à medida em que se propõe distinguir o limite entre o que é o animal e o que é o humano. A inovação de Agamben na abordagem dessa questão, portanto, está no modo como ele politiza o tema do aberto e o situa numa zona estratégica entre a zoologia e as políticas do homem. A entificação do tema, o aberto, não é para o autor um índice de conspurcação cientificista; é, antes, um índice de incessante politização, isto é, realocação conceitual, modulação disciplinar e institucionalização jurídica. Agamben não quer apenas uma ciência da política, mas também uma política da ciência, entendendo a ciência como lugar soberano de mobilização, manipulação e controle dos corpos. Numa palavra, a ciência, especificamente, a biofilosofia e as ciências do homem, são legisladoras da decisão pública acerca do que é homem. E quem decide o que é o homem, decide ex ante, qual política e qual moral deve dispor sobre a ordem pública.Abstract: This paper aims to do an exegesis of Giorgio Agamben´s book The Open: the Man and the Animal, in order to expose its central point as well as to contextualize the author in Contemporary Political Philosophy. According to Agamben the open is not situated only in a phenomenological-existential analytics of being: politically the privileged place of that concept is specifically on the biophilosophy of organic grades. The definition of those grades becomes more and more imprecise as long as it aims to distinguish the limit between the man and the animal. The innovation of Agamben is the way how he politizes the subject of open and places it on a strategic zone between the zoology and the politics of man. Agamen does not want only a science of the political, but alson a politics of science by understanding the science as a sovereign place of mobilization, manipulation, and control of bodies. In a word, the science, especially the biophilosophy and the human sciences, are legislators of public decision about what man is. And who decides what the man is, do it ex ante which politics and which moral should rule over the public order. Keywords: Agamben, mankind, animal, biophilosophy.

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