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A motion simulation and biomechanical analysis of the shoulder joint using a whole human model

A motion simulation and biomechanical analysis of the should...

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2011 4th International conference on Biomedical engineering and Informatics, BMEI 2011

作者： Sen, Suddhajit Abboud, Rami Wang, Weijie Ming, Dong Wan, Baikun Liao, Yi Gong, Qiyong Institute Motion Analysis and Research University of Dundee Dundee United Kingdom Dept Biomedical Engineering Tianjin University Tianjin China Dept Radiology West China Hosp Sichuan University Chengdu China

ISBN: (纸本)9781424493524

The analysis of movements and forces of human or animal subjects is useful in both the real and virtual worlds. We proposed the design of a computer model which simulates the movements at the shoulder joint for a specific subject and analyses the three-dimensional forces and torques produced at that joint during movement. The model was constructed using the mathematical dynamic modelling software (Madymo). Anthropometric data were collected from a healthy volunteer in the form of weight, height, limb lengths, and the centre of mass deduced. A group of reflective markers were attached to specific areas on the subject's body while he performed a group of precise movements, i.e. flexion/extension, adduction/abduction and rotation all at the shoulder. The marker data were collected using a motion capturing system. Shoulder joint angles were obtained using the in-house designed software, and then input into the computer model to simulate the subject's movements allowing analysis of the forces and torques. Results showed that the model successfully simulated the movements and predicted shoulder joint force and torque during movements, corroborating with the theory of biomechanics. Preliminary results are encouraging. Currently, the focus is on extending the application into the clinical practice, sports exercise and behavioural animation environments. © 2011 IEEE.

关键词： Biomechanics

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SPH numerical approach in modelling 2D muddy debris flow

SPH numerical approach in modelling 2D muddy debris flow

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5th International conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment

作者： Minatti, L. Pasculli, A. University of Florence Department of Civil and Environmental Engineering Italy University G. d'Annunzio Chieti-Pescara Department of Science Italy

ISBN: (纸本)9788895814469

2D muddy debris flow has been simulated according to a dam break like problem along a slope. The two sets of equations related to the fluid and solid phases, as considered by the debris flow mixture theory, have been simplified in only one set of equations, considering just one equivalent material. Then the Herschel-Bulkley fluid constitutive equations have been selected. The correct parameters of the HERSCHEL-BULKLEY model have been chosen in order to correctly simulate the behaviour of mudflows. The final mathematical model, has been solved numerically with the smoothed particle hydrodynamics (SPH) method. SPH is a particle mesh-free Lagrangian method, well suitable for computing highly transitory free surface flows of complex fluids in complex geometries. Finally a laboratory experimental test has been selected for comparison. Satisfactory results have been achieved. Nevertheless, further parametric analyses will be carried out and further considerations about both constitutive equations and numerical improvements will be employed and discussed in future papers. © 2011 Casa Editrice Università La Sapienza.

关键词： Constitutive equations

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modelling ethnographic analyses for records via Tacit Contracts

Modelling ethnographic analyses for records via Tacit Contra...

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2011 5th International conference on Research Challenges in Information Science, RCIS 2011

作者： Williams, Gbolahan Poernomo, Iman Luff, Paul Department of Informatics King's College London United Kingdom Department of Management King's College London United Kingdom

ISBN: (纸本)9781424486694

This paper advocates an approach to requirements analysis drawing on social scientific research strategies (Ethnography) and model based engineering (MBE). Our work is aimed at bridging the gap between applied ethnographic reports and the early stages of the software development lifecycle (SDLC). Taking a view on how we think data should be represented at the requirements level, we demonstrate an approach to modeling and documenting requirement-centric ethnographic reports based on linguistic statements and human behaviour. The work is particularly oriented towards documenting requirements for data. We make an arguement on what types of information should be included in requirements level data schemas. Our methodology looks at an established ethnographic study in order to elucidate problems that you find with standard requirements models. Our solution is to extend UML with so called Tacit Contracts that enhance requirements-level data schemas by highlighting tacit information to do with the composition and characteristics of the data being described. The tacit contract then requires system designers at latter phases of the SDLC to also take into account information expressed as tacit in the requirements models when making design decisions about the system. © 2011 IEEE.

关键词： Requirements engineering

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Dynamic behaviour of elastic cam devices driven by servomotors with PID velocity control

Dynamic behaviour of elastic cam devices driven by servomoto...

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IEEE International conference on Automation Science and engineering (CASE)

作者： Giovanni Incerti Department of Mechanical and Industrial Engineering State University of Brescia Brescia Italy

A mathematical model for dynamic analysis of elastic cam devices driven by DC motors with velocity control is presented in this paper. Besides the dynamic modelling of the cam system, the model considers the electromagnetic behaviour of the motor and the response of the speed regulator, based on a standard PID (proportional, integral and derivative) algorithm. The proposed model can be used as design tool, to simulate actual cam servomechanisms with a good degree of reliability and to evaluate the effects due to a modification of the control system parameters. Some simulation results are included in the paper, to demonstrate the possibility of use of the model.

关键词： DC motors mathematical model Acceleration Equations Torque Regulators Velocity control

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Service science: Introducing service networks performance analytics

Service science: Introducing service networks performance an...

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作者： Carroll, Noel Richardson, Ita Whelan, Eoin Lero - The Irish Software Engineering Research Centre Department of Computer Science and Information Systems University of Limerick Limerick Ireland Department of Management and Marketing Kemmy Business School University of Limerick Limerick Ireland

ISBN: (纸本)9789898425522

Although services are delivered across dispersed complex service eco-systems, monitoring performance becomes a difficult task. This paper explores a number of areas to support the development of service performance analytics within the discipline of service science. The paper provides a comprehensive account for the need to introduce modelling techniques to address the significant research void and explains how actor network theory (ANT) can be introduced as one of the core theories to examine service operations and performance. ANT sets out to develop an understanding on both how and why networks exist and to understand processes co-creation between human and non-human actors. By examining performance, this paper draws our attention towards the need to formulate methods to examine service network key performance indicators and the need to model service interaction, structure, and behaviour which impact on performance and consequently on service evolution.

关键词： Benchmarking

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Modeling and Control of Compact Anthropomorphic Robot Finger

Modeling and Control of Compact Anthropomorphic Robot Finger

引用

2011 International conference on modelling,Identification and Control(ICMIC 2011)

作者： Norsinnira Zainul Azlan Hiroshi Yamaura the Department of Mechanical and Control Engineering Graduate School of Science and EngineeringTokyo Institute of TechnologyOokayama 2-12-1-13-10Meguro kuTokyo158-8552

This paper presents the development of the mathematical model and controller of a light weight and small size robot *** finger possesses self adaptive grasping capability and is made of seven bar linkages with a slider or lead screw mechanism in the middle phalanx to adjust its effective length in realizing both pinching and grasping *** dynamic model of the linkages is integrated with the electrical motors mathematical description to represent the whole robotic *** simulations have been carried out to study the finger’s dynamic behaviour under the Proportional Integral Derivative (PID) control.

关键词： Modeling and Control of Compact Anthropomorphic Robot Finger

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Development and validation of a mathematical model of warm drawing process of magnesium alloys in heated dies

Development and validation of a mathematical model of warm d...

引用

WAI's 81st Annual Convention, Interwire 2011

作者： Milenin, A. Kustra, P. Seitz, J.-M. Bach, Fr.-W. Bormann, D. Faculty of Metal Engineering and Industrial Computer Science AGH University of Science and Technology Al. Mickiewicza 30 30-059 Krakow Poland Institute of Materials Science University of Hanover Schoenebecker Allee 2 30823 Garbsen Germany

Due to high compatibility and solubility in human organism, special magnesium alloys are applied in bioengineering. Production of surgical threads to integration of tissue can be application of these types of alloys. This sort of application calls for fine wires with diameters from 0.1 to 0.9 mm. The warm drawing process in heated dies is proposed to increase the workability of the Mg alloys. The purpose of this paper is development and experimental validation of a mathematical model of a warm drawing process of wires made of MgCa0.8 and Ax30 alloys and determination of optimal parameters with the objective function defined as maximum of workability. The first part of investigation is focused on development of a numerical model, which is based on FE solution. The second part of paper is focused on experimental upsetting and tensile tests. Basing on these tests the flow stress and ductility models were obtained. The materials models are implemented into the Authors FE code, which is dedicated to modelling of drawing processes. Experimental validation of model is based on thermo visual measurement of wire temperature during drawing.

关键词： Magnesium alloys

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A novel approach to modelling and simulation of the dynamic behaviour of the wheel-rail interface

A novel approach to modelling and simulation of the dynamic ...

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International conference on Automation and Computing (ICAC)

作者： Arthur Anyakwo Crinela Pislaru Andrew Ball Fengshou Gu Diagnostics Engineering Research Centre University of Huddersfield Huddersfield UK

This paper presents a novel approach to modelling and simulation of the dynamic behaviour of rail-wheel interface. The proposed dynamic wheel-rail contact model comprises wheel-rail geometry and efficient solutions for normal and tangential contact problems. This two-degree of freedom model takes into account the lateral displacement of the wheelset and the yaw angle. Single wheel tread rail contact was considered for all simulations and Kalker's linear theory and heuristic non-linear creep models were employed. The second order differential equations are reduced to first order and the forward velocity of the wheelset is increased until the wheelset becomes unstable. A comprehensive study of the wheelset lateral stability is performed and is relatively easy to use since no mathematical approach is required to estimate the critical velocity of the dynamic wheel-rail contact model. This novel approach to modelling and simulation of the dynamic behaviour of rail-wheel interface will be useful in the development of intelligent infrastructure diagnostic and condition monitoring systems. The automated detection of the state of the track will allow informed decision making on asset management actions - especially in maintenance and renewals activities.

关键词： mathematical model Wheels Creep Equations Rails Modeling Geometry

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modelling the trading behaviour in high-frequency markets

Modelling the trading behaviour in high-frequency markets

引用

Computer Science and Electronic engineering conference (CEEC)

作者： Monira Aloud Edward Tsang School of Computer Science and Electronic Engineering University of Essex UK

We use an agent-based approach to model trading behaviour in high-frequency markets. This study focuses on the Foreign Exchange (FX) market. The initial part of this study is to observe the micro-behaviour of traders to define the stylized facts of their trading activities. This is performed using a high-frequency dataset of anonymised individual traders' historical transactions on an account level, provided by OANDA Ltd. This dataset is considered to be the biggest available high-frequency dataset dealing with the individual FX market traders' trading activities. The second step is to build agent-based models of traders. The traders are modelled to respond to physical time to account for the different market seasonalities. The key elements in modeling the traders are zero-intelligence directional-change events trading strategy, historical prices, actual FX market traders' behaviour, limit orders, FX market trading sessions and market holidays. Using the identified stylized facts of FX market trading activity, we evaluate the trading agents' collective trading behaviour. The results of this comparison indicate that the trading agents' collective trading behaviour resembles, to a certain extent, the collective trading behaviour of FX market traders.

关键词： Business Computational modeling Time series analysis Biological system modeling Buildings mathematical model Consumer electronics

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An improved multiphysics modelling approach for dielectrophoresis-based cell separation

An improved multiphysics modelling approach for dielectropho...

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Canadian conference on Electrical and Computer engineering (CCECE)

作者： Antoine Gagné Mohamed Amine Miled Mohamad Sawan Department of Electrical Engineering École Polytechnique de Montreal Québec Canada

ISBN: (纸本)9781424497881;9781424497898

This article presents a new multiphysics modelling approach for cell manipulation by dielectrophoresis. This approach is proposed to model and predict the behavior of particles injected into a microchannel due to the application of an electrical field. The objective of this model is to better characterize microelectronic circuits dedicated to design and implement hybrid systems such as lab-on-chips integrating microelectronics and microfluidic structures. The proposed model allows to determine the required configuration of microelectronic circuits and needed control signals to generate. This model applies primarily to applications using dielectrophoresis cell separation in a micro- channel. Then, by using the proposed model, the cell behaviour can be predicted using an advanced multiphysics simulation method.

关键词： Integrated circuit modeling mathematical model Microelectronics Biological system modeling Dielectrophoresis Microchannel Electric potential

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