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modeling of effort perception in lifting and reaching tasks

Modeling of effort perception in lifting and reaching tasks

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digital human modeling for design and engineering conference and Exposition

作者： Kim, Kyunghan Martin, Bernard J. Chaffin, Don B. Woolley, Charles B. Department of Industrial and Operations Engineering University of Michigan 1205 Beal Avenue Ann Arbor MI 48109 2117 United States

Although biomechanics models can predict the stress on the musculoskeletal system, they cannot predict how the muscle load associated with exertion is perceived. The short-term goal of the present study was to model the perception of effort in lifting and reaching tasks. The long-term goal is to determine the correlation between objective and subjective measures of effort and use this information to predict fatigue or the risk of injury. Lifting and reaching tasks were performed in seated and standing situations. A cylindrical object and a box were moved with one hand and two hands, respectively, from a home location to shelves distributed in the space around the subject. The shoulder and torso effort required to perform these tasks were rated on a ten point visual analog scale. Statistical regression models were developed to determine the effects of target location, gender, age, strength, stature, hands used, and condition (seated or standing) on the perception of effort at the shoulder and low back, respectively. Copyright © 2001 Society of Automotive Engineers, Inc.

关键词： Musculoskeletal system

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Predicting fatigue for isolated joints while wearing an extra-vehicular mobility unit (EMU)

Predicting fatigue for isolated joints while wearing an extr...

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digital human modeling for design and engineering conference and Exposition

作者： Maida, James C. Gonzalez, L. Javier Rajulu, Sudhakar Miles, Erica NASA JSC United States Johnson Engineering United States Lockheed Martin

To work outside a space craft, humans must wear a protective suit. The required suit pressurization creates additional resistance for the wearer while performing work. How much does the suit effect work and fatigue? To answer these questions, dynamic torque was collected for the shoulder, elbow and wrist for six subjects in an Extra-vehicular Mobility Unit (EMU). In order to quantify fatigue, the subjects were to exert maximum voluntary torque for five minutes or until their maximum fell below 50% of their initial maximum for three consecutive repetitions. Using the collected torque and time data, logarithmic based functions were derived to estimate torque decay to within an absolute error of 20%. These results will be used in the development of a generalized tool for prediction of maximum available torque over time for humans using the current EMU. Copyright © 2001 Society of Automotive Engineers, Inc.

关键词： Torque

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Heuristic datapath allocation for multiple wordlength systems

Heuristic datapath allocation for multiple wordlength system...

引用

design, Automation and Test in Europe conference and exhibition

作者： G.A. Constantinides P.Y.K. Cheung W. Luk Electrical and Electronic Engineering Department Imperial College London London UK Department of Computing Imperial College London London UK

ISBN: (纸本)0769509932

This paper introduces a heuristic to solve the combined scheduling, resource building, and wordlength selection problem for multiple wordlength systems. The algorithm involves an iterative refinement of operator wordlength information, leading to a scheduled and bound data-flow graph. Scheduling is performed with incomplete wordlength information during the intermediate stages of this refinement process. Results show significant area savings over known alternative approaches.

关键词： Delay High level synthesis Educational institutions digital signal processing Energy consumption Distortion Computational modeling Power system modeling Signal synthesis Hardware

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Prediction of head orientation based on the visual image of a three dimensional space

Prediction of head orientation based on the visual image of ...

引用

digital human modeling for design and engineering conference and Exposition

作者： Kim, Kyunghan Martin, Bernard J. Department of Industrial and Operations Engineering University of Michigan 1205 Beal Avenue Ann Arbor MI 48109 2117 United States

Head movements contribute to the acquisition of targets in visually guided tasks such as reaching and grasping. It has been found that head orientation is generally related to the spatial location of the visual target. The movements of the head in a three-dimensional space are described using six degrees of freedom including translations along x-, y- and z-axis plus rotations about x-, y- and z-axis. While the control of head movement is heavily dependent upon visual perception, head movements lead to a change in the visual perception of the task space as well. In the present study we analyzed head movements in a set of driving simulation experiments. Also a theoretical reconstruction of the perceived task space after head movements was modeled by a statistical regression. This process included the transformation of the task space from a global reference frame (earth-fixed) into a perceived space in a head-centered reference frame (head-fixed). Derived transformation parameters were decomposed into translational / rotational components of the head movements and compared to actual head rotation / translation to confirm the effectiveness of the model. Copyright © 2001 Society of Automotive Engineers, Inc.

关键词： Head frames

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Simulation-guided property checking based on multi-valued AR-automata

Simulation-guided property checking based on multi-valued AR...

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design, Automation and Test in Europe conference and exhibition

作者： J. Ruf D.W. Hoffmann T. Kropf W. Rosenstiel Institute of Computer Engineering University of Tübingen Germany

ISBN: (纸本)0769509932

The verification of digital designs, i.e., hardware or embedded hardware/software systems, is an important task in the design process. Often more than 70% of the development time is spent for locating and correcting errors in the design. Therefore, many techniques have been proposed to support the debugging process. Recently, simulation and test methods have been accompanied by formal methods such as equivalence checking and property checking. However their industrial applicability is currently restricted to small or medium sized designs or to a specific phase in the design cycle. In this paper, we present a method for verifying temporal properties of systems described in an executable description language. Our method allows the user to specify properties about the system in finite linear time temporal logic. These properties are translated to a special kind of finite state machines which are then efficiently checked on-the-fly during each simulation run. Properties may be placed anywhere in the system description and violations are immediately indicated to the designer.

关键词： Hardware Logic Process design Power system modeling Formal verification System testing Computational modeling Embedded computing design engineering Computer errors

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3D Anthropometric Data to Support human Centered Industrial design

3D Anthropometric Data to Support Human Centered Industrial ...

引用

The 6th Pan-Pacific conference on Occupational Ergonomics

作者： J.F.M.Molenbroek Product and System Ergonomics Faculty of Industrial Design Engineering Technology University of Delft THE NETHERLANDS

Three-dimensional anthropometric methods provide much more surface information about the human body than traditional anthropometry. Therefore,making use of this information correctly and fully has become a new research field in applied ergonomics. On the one hand,human digital modeling is a method to represent a target population based on anthropometric data for design processes. On the other hand, current digital modeling is not an exact representation of a person because it somewhat overlooks many 3D human body surface characteristics which can be acquired by 3D anthropometric methods. To be able to take 3D characteristics of body form into consideration, we developed a concept of defining human body form in terms of mathematical description. The discovery of the laws of human body form in terms of mathematical description will definitely add more scientific theory to current digital human modeling. In addition,a semantic concept of body form based on mathematical terms should be developed into a new language that can be understood by designers. As a result,a bridge is built between 3D anthropometric data and industrial design. Finally, this concept will also give a new insight into the conceptualization of product design. This paper discusses the necessity and possibility of mathematical terms to describe human body form for industrial design not only in product design but also for workplace evaluation and design. Furthermore,some new ideas for further study are discussed.

关键词： Three anthropometry, Body form, Mathematical descriptions, modeling

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Investigation of haptic framework for, quantitative design analysis in a virtual, environment

Investigation of haptic framework for, quantitative design a...

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International conference on Virtual Systems and MultiMedia

作者： C. Sharma T. Kesavadas Department of Mechanical and AeroSpace Engineering State University of New York University at Buffalo Buffalo USA

The effect of improved cognition on algorithm performance and evaluation is an exciting area of research. Virtual reality is becoming increasingly popular as a tool for interacting with data and steering the optimization process, rather than simply displaying results. Constantly evolving haptic technology allows people to directly interact with digital objects and data as they do in the real world using their sense of touch., Haptics is revolutionizing the way engineers interact with computers. Hitherto, designers and artists have used haptics to intuitively sculpt models using digital clay and doctors have trained on haptics based virtual surgical simulators Most applications however merely seek to make up for the lack of sense of touch and its effects. The current work investigates the application of the haptics loop for decision support activities in core engineering areas like design optimization and shop floor layout. The simulated annealing algorithm with an adaptive cooling schedule is used to solve the quadratic assignment problem for facility layout The results obtained are interpreted and tested using a combined haptic and graphic environment. The value added due to haptics in virtual reality environments is an open problem. human factor experiments for a decision-making environment were conducted to measure the value added due to inclusion of haptics. After a comprehensive series of tests, a decision is made with regards to use of haptics for engineering and scientific applications.

关键词： Haptic interfaces Virtual reality Application software Layout Testing Cognition Data engineering Surgery Computational modeling design engineering

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Machining feature-based comparisons of mechanical parts

Machining feature-based comparisons of mechanical parts

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International conference on Shape modeling and Applications

作者： V. Cicirello W.C. Regli The Robotics Institute Carnegie Mellon University Pittsburgh PA USA Geometric and Intelligent Computing Laboratory Department of Mathematics and Computer Science Drexel University Philadelphia PA USA

ISBN: (纸本)0769508537

Solid models are the critical data elements in modern computer-aided design (CAD) environments, describing the shape and form of manufactured artifacts. Their growing ubiquity has created new problems in how to effectively manage the many models that are now stored in the digital libraries of large design and manufacturing enterprises. Existing techniques from the engineering literature and from industrial practice, such as group technology, rely on human-supervised encoding and classification, while techniques from the multimedia database and computer graphics/vision communities often ignore the manufacturing attributes most significant in the classification of models. This paper presents our approach to the manufacturing similarly assessment of solid models of mechanical parts based on machining features. Our technical approach is three-fold: (1) perform machining feature extraction to map the solid model to a set of STEP AP 224 machining features; (2) construct a model dependency graph from the set of machining features; and (3) find the nearest neighbors to the query graph using an iterative improvement search across a database of other models. We also present empirical experiments to validate our approach using our testbed, the National design Repository ( ). The contribution of this research is the first fully automated technique for machining feature-based comparisons of mechanical artifacts. We believe that this work can lead to radical changes in the way in which design data is managed in modern engineering enterprises.

关键词： Machining Solid modeling Virtual manufacturing design automation Computer aided manufacturing Data engineering Shape Software libraries Computer industry Manufacturing industries

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Progress in linking human performance models and human motion simulation models

Progress in linking human performance models and human motio...

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digital human modeling for design and engineering conference and Exposition

作者： Laughery, Ron Scott-Nash, Shelly Micro Analysis and Design

Over the past fifteen years, modeling humans in systems has become a more and more common part of design. There have been two focuses of modeling humans - modeling human anthropometry and biomechanics and modeling human behavior and cognition. Recent advances in computer technology are making it easier to integrate models from these two schools. The result of this integration will be dramatic animations that reflect the complexity of human behavior. This paper will address some specific ideas and progress we are making towards this integration. Copyright © 2000 Society of Automotive Engineers, Inc.

关键词： Behavioral research

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Combined force-posture model for predicting human postures and motion by using the ramsis human model

Combined force-posture model for predicting human postures a...

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digital human modeling for design and engineering conference and Exposition

作者： Rothaug, Holger TECMATH AG Germany

The realistic simulation of human postures and motion becomes more and more an important tool for the design and development of vehicles and cockpits. Todays professional digital human models are using mainly two different procedures: Either using only posture predicition defined by the setting of joint angles or by only looking at masses and joint moments (as used in crash simulations). A coupling of both procedures leads to a task driven prediction of postures and motion including outer influences like forces, moments and balance. Copyright © 2000 Society of Automotive Engineers, Inc.

关键词： Automotive engineering

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