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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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Influence of object properties on reaching and grasping tasks

Influence of object properties on reaching and grasping task...

引用

digital human modeling for design and engineering conference and Exhibition

作者： Bae, Sungchan Choi, Jaewon Armstrong, Thomas J. University of Michigan 1205 Beal Avenue Ann Arbor 48109-2771 United States

This paper investigates how reaching and grasping are affected by various object properties and conditions. While previous studies have examined the effect of object attributes such as size, shape, and distance from the subject, there is a need for quantitative models of finger motions. To accomplish this, the experiment was performed with six subjects where the 3D-coordinates of the finger joints and the wrist of one hand were recorded during reaching and grasping tasks. Finger joint angles at final posture were found to depend on both object size and orientation while wrist postures were changed primarily depending on object orientation. Also, each object orientation caused alteration in relative object location with respect to the hand at final posture. In addition, analysis of temporal variables revealed that it took from 1.06 to 1.30 seconds depending on the object distance to start reaching and complete grasping of the object. People spent 44% of the total movement time on opening their fingers and 78% on reaching to the object. © 2008 SAE International.

关键词： Automotive engineering

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The development of human animation figures using 3D anthropometrical database

The development of human animation figures using 3D anthropo...

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digital human modeling for design and engineering conference and Exhibition

作者： Yu, Chi-Yuang Liang, Ming-Hui Liang Lin, Yen-Hui Huang, Yu-Cang National Tsing Hua University Taiwan Chung Shan Medical University Taiwan Logistic Technology Corporation Taiwan

The objective of this study is to develop 3D animation human figures using an existing anthropometrical database-the Taiwanese 3D BodyBank with 135 male and female subjects. Each subject was scanned with 9 postures, one of standing postures was designated as "standard" to develop animation figures, and the other 8 were used for evaluation purpose. The database was stratified into 15 different body size groups, 5 heights and 3 weights, for the development of 15 animation figures each for the males and the females. For both genders, we began with the establishment of a prototype model of the animation figure on the median body size group. The developing of the prototype model is proceeded as (1) the selection of representative model within each body size group, (2) the design of the skeleton, (3) the definition of spherical coordinate system, (4) the organization of data structure, (5) the implantation of the skeleton, and (6) the binding of the surface data with the skeleton. The results of the prototype model were evaluated on accuracy and precision by superimposing the animated postures onto the 8 scanned postures. The finding showed that the average mismatching errors were all smaller than 10 mm. and the maximal mismatching errors were smaller than 16 mm. This prototype model was applied onto the rest of 14 body types using template matching method. © 2008 SAE International.

关键词： Animation

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Validation of a human body model for frontal crash and its use for chest injury prediction

Validation of a human body model for frontal crash and its u...

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digital human modeling for design and engineering conference and Exhibition

作者： Pipkorn, Bengt Mroz, Krystoffer Autoliv Research

Whole-body kinematics of the finite element human body model THUMS was evaluated by means of sled tests. A model of a crash test dummy (Hybrid-III 50%-ile) was used to validate the test environment by matching the model predictions to the experimentally measured dummy sled test responses. Once the environment was validated, the THUMS model was placed in the sled model and the post mortem human subject (PMHS) sled tests were replicated. Two test configurations were used for the evaluation. One configuration was high impact velocity sled tests with an advanced restraint system. The other configuration was low impact velocity sled tests with a basic restraint system. The test velocities were 48 km/h and 29 km/h respectively. The evaluation was carried out by an objective rating method that compared predictions from the model to results from the mechanical tests. The method assessed the peak level, peak timing and curve shapes of the predictions relative to the test results. The mathematical crash dummy model predictions matched the mechanical counterpart responses well, confirming that the test environment was replicated. The match between the THUMS model predictions and PMHS responses was not as good. Generally the chest deflection predicted by THUMS was greater than the chest deflection predicted by the PMHS. There was also a discrepancy between model prediction of chest injury and PMHS injury. © 2008 SAE International.

关键词： Forecasting

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A simple DSP based control system design for a three-phase high power factor boost rectifier

A simple DSP based control system design for a three-phase h...

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

作者： B. Tamyurek A. Ceyhan E. Birdane F. Keles Electrical and Electronics Engineering Department Eskisehir Osmangazi University Eskisehir Turkey Kaynak Electronic Machine Industry and Trade Company Limited Eskisehir Turkey

This paper presents the design and implementation of a simple control system for three-phase high power factor boost rectifiers in power-factor-corrected online UPS applications. The design and simulation of the control system are performed in Simulink using Texas Instruments DSP tools as the controlling units and the PLECS circuit models as the power converter unit, and then the verified design is converted into a DSP code to be implemented in a real DSP chip. The boost rectifier stage is realized as six-switch IGBT based PWM converter. Performance of the controller developed in Simulink platform by emulation method is experimentally verified. Consequently, the results confirm that the proposed controller achieves high power factor at the input and overall good dynamic response for the boost rectifier under sudden load and input voltage variations, and also demonstrate the applicability of the design methodology presented in the paper.

关键词： digital signal processing Control systems Reactive power Rectifiers digital signal processing chips Uninterruptible power systems Circuit simulation Control system synthesis Instruments Power system modeling

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Simulation tools, ergonomics principles and work measurement anslysis for workstation design

Simulation tools, ergonomics principles and work measurement...

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Summer Computer Simulation conference 2008, SCSC 2008, Part of the 2008 Summer Simulation Multiconference, SummerSim 2008

作者： Bocca, E. Longo, F. Liophant Simulation Via Molinero 1 17100 Savona Italy Mechanical Department Modeling and Simulation Center University of Calabria Via Pietro Bucci Cube 46C 87036 Arcavacata di Rende Italy

ISBN: (纸本)9781622763597

Methods engineering is nowadays a systematic approach to work planning and continuous improvement. Nonetheless, all measuring techniques of human work activities - although with different application modes according to the situation - are excellent tools to quantify the time necessary to perform each activity and, in a wider perspective, an essential precondition for an efficient management of production. Given such a context the use of cutting-edge software and hardware technology can realistically support and prompt the digital formalization of real production contexts, allowing considerable evolution of traditional work planning techniques, thereby enhancing precompetitive research and development of small and medium-sized enterprises. The present work, concerning the innovation of the production plant of a small enterprise specializing in leather goods production, describes computer aided planning steps to evaluate the best configuration of assembly work stations. The results obtained are very interesting and effective, above all if they are considered in the perspective of an increase of the planning capacity within SMEs. In fact, they enable to obtain objective evaluation of work stations, as far as time and ergonomics are concerned.

关键词： Ergonomics

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Dynamic hand space envelope during reaching and grasping

Dynamic hand space envelope during reaching and grasping

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digital human modeling for design and engineering conference and Exhibition

作者： Choi, Jaewon Bae, Sungchan Armstrong, Thomas J. University of Michigan 1205 Beal Avenue Ann Arbor MI 48109-2771 United States

The objective of this paper is to investigate the dynamic space envelope during reaching and grasping tasks. Some amount of space is required for the hand and arm to move without interference in reach-to-grasp tasks. The required space ('dynamic space envelope') has not been examined in spite of its importance. In this paper, we tested the hypothesis that the dynamic space envelope is a function of object size, hand size, grip type and distance. Six subjects (5 males, 1 female) participated in an experiment, in which they reached for and grasped three differently sized cylindrical objects (D: 26 mm, 60 mm, 114 mm) placed 40 cm in front of the subjects. Twenty-three markers were attached to the dorsal side of the hand and a 3-D motion capture system recorded the positions of the markers during reaching and grasping. The total distance from start to end positions is evenly divided into 10 ranges, and the areas of the required spaces were calculated for each range. It was observed that dynamic space envelope increased as the hand size increased (on average, 155 mm 2 increase per 1 mm increase of hand length). Increasing object size required more space envelope (on average, 15 mm2 increase per 1 mm increase of object diameter). Power grip required 10% more space than pinch grip on average. It was found that the largest space was required when the hand reached 70% of total distance. The information of a dynamic space envelope enables the design of a workspace or automobile interior which minimizes interference of hand movement. © 2008 SAE International.

关键词： Automotive engineering

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The design of half-face masks shape and sizing using 3D craniofacial database

The design of half-face masks shape and sizing using 3D cran...

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digital human modeling for design and engineering conference and Exhibition

作者： Lee, Hsiang-Yi Yang, Yi-Hsieh Yu, Chi-Yuang Chen, Chih-Yong Nan Hua University Taiwan Logistic Technology Corporation Taiwan National Tsing Hua University Taiwan Institute of Occupational Safety and Health Taiwan

This study proposes a design method for half-face masks shape and sizing using an existing 3-D head database, aiming at air-tightness of faceseal and minimization of dead-space volume. The design procedure consists of two phases: extraction of 3-D faceseal contour and construction of mask body. In the extraction phase, the samples were divided into sizes L and S based on face-length (nasion-to-menton). Then mask boundary contour was determined from the middle sample. This boundary contour was projected onto every sample to extract 3-D faceseal contours and they were superimposed. The lateral side dispersion is a measure of air-leakage. Since the dispersion were greater than the design allowance of material elasticity and flesh deformation limit, sizing were further divided into "LS (shallow)", "LD (deep)", and "SS" and "SD". Within each size group, the sample with the deepest faceseal was selected as the final representative 3-D faceseal contour. The 3-D face surface (of the final representative sample) encircled by the faceseal was used to construct the mask body. The central longitudinal ridge-rib of the mask was constructed from the mid-sagital line. It was elevated above 10 mm at mid-nasion, 20 mm at nasal-tip and 10 mm at menton levels. Next, a series of horizontal contours were drawn crossing these reference points and were further interpolated to form a 3-D surface of the mask. The space bounded between the mask body and the face surface is the dead-space volume. The dead volume each for SS, SD, LS, and LD size was 168.3 cm3, 176.8 cm 3, 174.2 cm3, and 185.1 cm3 respectively, which is smaller than most existing masks (with a mean of 224.3 and S.D of 28.5) © 2008 SAE International.

关键词： Extraction

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New Expression of humanization Product design under the Background of digital Technology

New Expression of Humanization Product Design under the Back...

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2008 IEEE 9th International conference on Computer-Aided Industrial design & Conceptual design

作者： Jie Liu~1 Xuesong Yang~2 1 School of Urban design of WuHan University,WuHan,P.R.China School of Urban design of WuHan University,WuHan,P.R.China

digital technology has made a tremendous impact on humanization design of *** the specifically product design,these effects mainly manifest themselves in the following three aspects which include form, function and human-computer interaction *** the progress of processing technology and the emerging of new materials and technologies,the products modeling become"diversification"and"miniaturization",and the use of software promoted the diversification of product,improved the efficiency and security of *** content of product's interactive design have some changes,which is mainly a transformation from the single"hard"interface to the multi-interface combines"soft and hard"interfaces.

关键词： digital technology humanization Product design.

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An implementation of web based PDM with open source CMS

An implementation of web based PDM with open source CMS

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IEEE International Symposium on Virtual Environments, human-Computer Interfaces and Measurement Systems (VECIMS)

作者： Chia-Chen Yen Chiaming Yen Jih-Shih Hsu Department of Information Management National Yunlin University of Science and Technology Yunlin Taiwan Department of Mechanical Design Engineering National Formosa University Yunlin Taiwan

The importance of content management systems (CMS) has increased dramatically in recent years, but the open source CMS is usually criticized for the lack of applications in manufacturing fields. CMS has predominantly focused on managing documents, and on the other hand, product data management (PDM) is a digital repository of product information, including non-paper representations like CAD files. In this paper, a Web based PDM System is implemented and integrated with the open source CMS to cope with the tasks of the mechanical design. There are three major functions provided in this system. First of all, to provide users with a Web based product data vault system for design related files storage. Secondly, a data-sharing and collaboration system are created to enhance the pre-manufacturing planning and detailed design communication. The third function of this system allows user to setup an efficient programming environment for the engineering analysis processes.

关键词： Virtual reality Solid modeling Internet Manufacturing Planning Classification algorithms Business

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A Study of ’Hand Stitching Article’ for Animation Model design Based on ’Pixel Art’

A Study of ’Hand Stitching Article’ for Animation Model De...

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2008 IEEE 9th International conference on Computer-Aided Industrial design & Conceptual design

作者： ZhangRuirui XiongShaowei ZhangJing School of Art & design Hubei University of Technology

＜正＞Animation is an inevitable product in the development of the human *** the computer graphics provides unlimited possibilities for the development of the animation industry and the researches into art *** one kind of the digital art,‘pixel art’ is an‘extreme’expression form of the bitmap, while the Chinese folk art form,‘hand stitching article’,also known as‘Cross-stitched Flower Pattern’,mainly using the form of latitude and longitude coordinates to make a‘points’collective *** it can be seen that‘pixel art’has a very long history and a rather wide spread of range. This paper aims to reference the Chinese folk art form‘hand stitching article’,using the‘pixel art’technology to explore the animation modeling performance,eventually to create a global animation modeling image that combines with modern artistic trends and reflects the folk characteristics.

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