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检索条件"任意字段=Digital Human Modeling for Design and Engineering Conference and Exposition"

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A study of car safety performance in side impact using human head FE model

A study of car safety performance in side impact using human...

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digital human modeling for design and engineering conference and Exhibition, DHM 2009

作者： Zhang, Bin Yang, Jikuang State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University China Chalmers University of Technology Sweden

This research investigated the safety performance of a passenger car in side collisions, using a side air-curtain protective device to minimize the risk of head-brain injuries. Traumatic brain injury in passenger vehicle side collisions is one of the common injury patterns with fatal consequences in traffic accidents. A dummy head has limited capability to evaluate vehicle safety performance with detailed injury related physical parameters. Continuous development of mathematical models has provided efficient tools for assessing the safety performance of a protective device. A validated head-brain FE model and air-curtain model was employed to simulate the impact responses of head-brain to B-pillar and further quantify the effect of the air-curtain on the protection of the human head in side collisions. A parametric study was conducted using the design of experiment approach. The kinematics of a head impacting the B-pillar and the air-curtain are presented. The calculated physical parameters from the head-brain FE model include the distribution of von Mises stress, shear stress, coup pressure, contrecoup pressure, and accelerations during vehicle side collision. Study outcomes suggested that using a side air-curtain protective device can reduce von Mises stress, shear stress, coup pressure, contrecoup pressure, and deceleration rate during vehicle side impact. The efficiency of the protective device for head-brain injuries is identified by reducing the HIC (Head Injury Criterion) to 80% of original values. Copyright © 2009 SAE International.

关键词： design of experiments

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Contour-based 3D Point Cloud Simplification for modeling Freeform Surfaces

Contour-based 3D Point Cloud Simplification for Modeling Fre...

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IEEE Toronto International conference on Science and Technology for humanity

作者： Sareen, Kuldeep K. Knopf, George K. Canas, Robert Univ Western Ontario Dept Mech & Mat Eng London ON N6A 5B9 Canada Univ Western Ontario Fac Engn London ON N6A 5B9 Canada CNR Inst Res Construct London ON N6G 4X8 Canada

ISBN: (纸本)9781424438785

The reconstruction of accurate freeform surface models of 3D scanned objects is a common task encountered in creating virtual reality environments for anatomical reconstruction, cartography, cultural artifact modeling, digital archaeology, infrastructure renewal, and computer-aided design. Difficulties occur in reconstructing smooth surfaces from these scanned data sets because the acquired data is very large and is often infiltrated with scanning errors. For surface reconstruction, visualization, and interactive virtual modeling, it is necessary to reduce the amount of raw scanned data. Many existing data simplification techniques are complex and not directly applicable to spline-based surface models. A novel two stage contour-based data simplification algorithm is introduced in this paper and applied to facial surface reconstruction, which may be used for human modeling for computer games or model creation for virtual museums. The first stage extracts a series of equally spaced sectioned contours directly from a dense 3D data points. In the second stage, each extracted contour is redefined as a cubic B-spline curve by reduced number of control points defined by a user defined reduction ratio. A lofted surface is finally created from these reconstructed contours. The effectiveness of the synthetic surface reconstruction algorithm is demonstrated using its deviation values from its original point cloud data set. The experimental results show that the proposed algorithm generates a fairly accurate spline based facial model with only 5-20% of the actual scanned data, based upon the surface complexity. Performance can be improved by increasing the number of extracted contours, followed by a greater reduction ratio in the second data simplification stage.

关键词： Data simplification decimation geometric modeling shape reconstruction facial features

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A study on head injury risk in car-to-pedestrian collisions using FE-model

A study on head injury risk in car-to-pedestrian collisions ...

引用

digital human modeling for design and engineering conference and Exhibition, DHM 2009

作者： Chen, Yong Yang, Jikuang Xu, Wei State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University China Chalmers University of Technology Sweden

Head injury is quite frequently occurred in car-to-pedestrian collisions, which often places an enormous burden to victims and society. To address head protection and understand the head injury mechanisms, in-depth accident investigation and accident reconstructions were conducted. A total of 6 passenger-cars to adult-pedestrian accidents were sampled from the in-depth accident investigation in Changsha China. Accidents were firstly reconstructed by using Multi-bodies (MBS) pedestrian and car models. The head impact conditions such as head impact velocity;position and orientation were calculated from MBS reconstructions, which were then employed to set the initial conditions in the simulation of a head model striking a windshield using Finite Element (FE) head and windshield models. The intracranial pressure and stress distribution of the FE head model were calculated and correlated with the injury outcomes. Reconstruction results show that the coup/contre-coup pressure, Von Mises stress and shear stress are important physical parameters to predict the brain injury risks. Copyright © 2009 SAE International.

关键词： Finite element method

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A New Data Visualisation Methodology for Evaluating Product design with digital human Models Integrated with Scanned Body and Captured Motion

A New Data Visualisation Methodology for Evaluating Product ...

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International conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Shengfeng Qin Lifang Yang Pin Zhang Yuhong Li School of Engineering and Design Brunei University Uxbridge Middlesex UK School of Mechatronic Engineering Harbin Institute of Technology Tianjin China Art and design College of Literature Nankai University Tianjin China

The paper presents a new methodology for displaying the user's functional demands and evaluating product design for older people. digital design models are integrated with virtual users (digital human models) generated in Jack software and refined from 3D body scanning data. The real interaction between physical design prototypes and potential users are captured by a 3D motion capture system. The captured motion is imposed onto the virtual human in Jack to perform design task analysis graphically.

关键词： Data visualization Product design humans Biological system modeling Ergonomics Motion analysis design engineering Lifting equipment Muscles Data engineering

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Multi-port Power Electric Interface for Renewable Energy Sources

Multi-port Power Electric Interface for Renewable Energy Sou...

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Annual IEEE conference on Applied Power Electronics conference and exposition (APEC)

作者： Wei Jiang Babak Fahimi Department of Electrical Engineering University of Texas Arlington Arlington TX USA

In order to accommodate increasing energy demand from "more electrified" domestic and vehicular applications, simultaneous use of various renewable sources are encouraged. Multiple converters are commonly adopted to process the renewable power as a distributed power system (DPS). However, due to the loose structure of DPS, reliability and load/source regulation will degrade as compared to an integrated converter system. This paper presents the concept of Multi-port Power Electronic Interface (MPEI) for renewable energy sources. With a unified converter topology and highly integrated digital control system, MPEI possesses the inherent capability of both source disturbance rejection and load dynamics regulation. MPEI identification, modeling and design are treated in a systematic manner in this paper. Power stages and digital control system will be implemented for a five-port MPEI in this paper. Experimental results will be presented to prove the feasibility of system design methodology.

关键词： Renewable energy resources Circuit topology Control systems DC-DC power converters Power system reliability Communication system control Costs Couplings Degradation Power electronics

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Customized Shoe-Lasts modeling Based on 3D Measurement

Customized Shoe-Lasts Modeling Based on 3D Measurement

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International conference on Information engineering and Computer Science (ICIECS)

作者： Lu-shen Wu Guoqiang Wu Qingjin Peng Mech. & Electr. Eng. Sch. Nanchang Univ. Nanchang China Mech. & Manuf. Eng. Univ. of Manitoba Winnipeg MB Canada

This research aims at improving efficiency and variety of shoe-lasts modeling in the footwear industry. A novel digital method is proposed for customized shoe-last modeling based on the analysis and research of human foot features and the shoe-last design theory. The method uses 3D foot data measured from human feet, combines with shoe-last design specifications and the force analysis of feet-shoe to decide the profile of shoe-lasts. The design of shoe-lasts is based on the action analysis of feet and shoes, foot features, discrete modeling methods and the variable subdivision modeling theory. The proposed method can perform a complete process from design to manufacturing of customized shoe-lasts. The experimental results show its feasibility. It is significant for customized shoe-lasts design and manufacturing.

关键词： Foot Footwear industry Spline Mechanical variables measurement humans Force measurement Surface topography Surface reconstruction Computer aided manufacturing CADCAM

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Testing and modeling of elevator door retention during hallway applied lateral loads

Testing and modeling of elevator door retention during hallw...

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digital human modeling for design and engineering conference and Exhibition, DHM 2009

作者： Wiechel, John F. First, Andrew Peterman, Elaine K. Morr, Douglas R. Tanner, C. Brian Boggess, Brian M. Ohio State University United States SEA Limited

Most do not consider there to be a risk in pushing on, bumping into or falling against an elevator door from the hallway side. However, the lack of the elevator cars presence alone, and the potential for severe injury or even death make this seemingly mundane situation potentially critical. Standards exist relative to such situations, and past and current designs attempt to account for this possibility, still people get injured interacting with these doors every year. In order to evaluate a real-world elevator door system's ability to withstand the quasi-static and impactive loads that can be placed on it by the general public during its life, both intentionally and unintentionally, a predictive tool is needed. This work represents the combination of empirical laboratory testing and numerical modeling of a typical elevator door system exposed to quasi-static and dynamic loading. The test procedures and methodology employed in this work provided repeatable and reliable results in quasi-static and dynamic testing. Numerical simulation using MADYMO established a robust and accurate quasi-static model of a primary door failure mode. The quasi-static MADYMO model can be used for quasi-static loading at any height of load application on the door and at any gib engagement depth up to full engagement with reliable and repeatable results. The dynamic MADYMO model showed accuracy at the 3 mm (0.12 in.) gib engagement depth at any contact height and any contact speed. A preliminary 6 mm (0.24 in.) gib engagement depth dynamic model has been verified for full-mass impacts of up to 1.5 m/s (4.8 ft/s). Copyright © 2009 SAE International.

关键词： Numerical models

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Emotional agent in serious game (DINO)

Emotional agent in serious game (DINO)

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8th International Joint conference on Autonomous Agents and Multiagent Systems 2009, AAMAS 2009

作者： Zhang, H.L. Shen, Z. Tao, X. Miao, C. Li, B. Ailiya, A. Cai, Y. School of Computer Engineering Nanayang Technological University Singapore 639798 Singapore School of EEE/SCI Nanayang Technological University Singapore 639798 Singapore

ISBN: (纸本)9781615673346

In this paper, we introduce an novel emotional agent system in 3D virtual world based on OCC (Ortony, Clore and Collins) theory, FCM (Fuzzy Cognitive Map) and GoalNet. The agent system is designed based on Goal Net model. Emotional modeling and decision making are based on OCC and FCM inference. Emotions modeled by the OCC model are incorporated into FCM inference. It has been shown emotion has a great impact in decision making. The proposed agent system has been applied to design human-like dinosaur agents in the research project "Immersion and Embodied Learning: Traces of Dinosaurs in Earth System Science" supported by National Research Foundation (NRF) Singapore. In this project, we have developed an agent mediated immersive Interactive digital Media that appropriately recreates and replays the traces of Earth's history using intelligent agent technology and 3D multi-user environment. The virtual world and emotional dinosaur agents are shown in the demo. The experiments conducted by students in secondary schools in Singapore have shown the emotional agents enable deep learning of earth science. Copyright © 2009, International Foundation for Autonomous Agents and Multiagent Systems.

关键词： Decision making

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Advanced digital control for the harmonization of wind-based energy in the electric power supply

Advanced digital control for the harmonization of wind-based...

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IEEE/PES Transmission and Distribution conference and Exhibition: Asia and Pacific

作者： Endusa Billy Muhando Tomonobu Senjyu Motoki Tokudome Toshihisa Funabashi Department of Electrical & Electronics Engineering University of Ryukyus Nishihara Okinawa Japan Meidensha Corporation Shinagawa Tokyo Japan

As wind turbines continue to grow in size and flexibility and are deployed in more hostile environments, the need to develop advanced control schemes will be elemental to deliver the lowest possible energy costs. This paper explores controller design based on modeling the wind speed as a stochastic process, and the wind generating system (WGS) as a multi-mass system with a soft shaft linking the turbine with the asynchronous generator. The control objectives are to enhance reduction in stresses on the drive-train and to ensure operation geared toward optimal power conversion. A sophisticated control strategy incorporating a multi-objective, full-state feedback with state estimation linear quadratic Gaussian (LQG) for generator torque control is proposed. This study focuses on above rated wind speeds, and the LQG's main purpose is to add damping to the drive-train, thereby minimizing cyclic fatigue, while a pitch mechanism prevents rotor overspeed thus ensuring the maximum power constraint is respected. Simulations show the efficacy of the proposed paradigm in meeting the control objectives.

关键词： digital control Power supplies Wind energy generation Wind turbines Wind speed Torque control Size control Costs Power system modeling Stochastic processes

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modeling and Analysis of a Current-Fed ZCS Full-Bridge DC/DC Converter with Adaptive Soft-Switching Energy

Modeling and Analysis of a Current-Fed ZCS Full-Bridge DC/DC...

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Annual IEEE conference on Applied Power Electronics conference and exposition (APEC)

作者： H. Wang H.S.H. Chung S. Tapuchi A. Ioinovici City University of Hong Kong Hong Kong China Sami Shamoon College of Engineering Beersheba Israel Holon Institute of Technology Israel

A full dc and ac analysis of a previous proposed boost-type-input soft-switching full-bridge converter is presented. The primary-side switches turn-on/off under a zero-current condition (ZCS). The soft-switching is realized by using a simple snubber, formed by two uni-directional switches and a resonant capacitor, in the primary side. The snubber's switches commute under a zero-voltage condition. The resonant energy used for getting ZCS is self-adaptable, depending only on the value of the input current. Except when the input current is at its maximum value, less resonant energy is used, keeping the conduction losses at a low value. A dc analysis allows for the calculation of the duty-cycle. The duty-cycle loss, the maximum voltage across the snubber capacitor, and the duration of the soft-switching assisted-intervals (the charging and discharging intervals of the snubber capacitor) are represented for different values of the resonant capacitor and the leakage inductance of the converter transformer. These graphics allow for an optimized design, by trading-off the voltage stress on the resonant capacitor (i.e. on the primary-side switches) with the loss of duty-cycle (i.e. with the ZCS regulation range). The range of the input voltage and load variation for which both output voltage regulation and soft-switching are assured is determined. Soft-switching is obtained for a wide line and load range. A current-controlled feedback circuit, using a digital signal processor (DSP) with a soft-start scheme was implemented. A small-signal ac analysis of the power stage allowed for the design of the digital controllers.

关键词： Zero current switching DC-DC power converters Resonance Capacitors Switches Snubbers Analog-digital conversion Inductance Graphics design optimization

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