Xuguang Wang

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California College of the Arts

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University College London

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Kansas State University

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Johns Hopkins University

Sonia Esperanza Monroy Varela

Universidad Nacional de Colombia (National University of Colombia)

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University of Oklahoma

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Papers by Xuguang Wang

A Data-Based Approach for Predicting Variation Range of Hand and Foot Maximum Force on a Control

Advances in Human Factors and Ergonomics Series, 2010

An Experimental Investigation of the Discomfort of Arm Reaching Movements in a Seated Position

SAE Technical Paper Series, 2004

The majority of existing studies on arm reaching were either limited to the determination of reac... more The majority of existing studies on arm reaching were either limited to the determination of reach envelopes or to motion analysis for understanding motion control strategies and/or their simulation. For ergonomic applications of digital humans, it is important to simulate motion and also to predict the discomfort felt by the virtual operator. Generic arm reaching movements in a seated position were studied in order to investigate the effects of age, gender and target position on motion and discomfort. The main results of discomfort analysis will be reported in the present paper. The analysis of the discomfort ratings has shown that elderly subjects differed significantly from younger ones. The results showed that both target orientation plane and height had a quadratic effect on the discomfort. The minimum was located in the sagittal plane at the half height between the seat and shoulder. Discomfort increased almost linearly with the distance. Based on these observations, a regression model of discomfort prediction for reach movements was proposed. The reliability of discomfort evaluation using a rating scale was also discussed.

A comparison of clutching movements of freely adjusted and imposed pedal configurations for identifying discomfort assessment criteria

Applied ergonomics, 2014

This paper focuses on the effects of the free pedal position adjustment on clutching movements of... more This paper focuses on the effects of the free pedal position adjustment on clutching movements of the left lower limb as well as on the perceived discomfort. Six automotive clutch pedal configurations were tested by 20 subjects (5 young females, 5 young males, 5 older females, 5 older males) using a multi-adjustable experimental mock-up. Results showed that the pedal position was adjusted to ensure a good starting pedal position allowing a less flexed ankle and avoiding unnecessary leg displacement from the foot rest to the position at start depression. Pedal position adjustment seemed not motivated by reducing joint torque though discomfort ratings were found significantly correlated with knee and ankle torques at the end of depression. The present work also illustrates that the less-constrained motion concept is helpful for a better understanding of people preference and useful for identifying motion-related biomechanical parameters to be considered for defining assessment criteria.

Apport d’enquêtes de terrain puis d’une simulation 3D par mannequin numérique pour l’aménagement spatial d’un poste de conduite de grue portuaire à conteneursWorkplace design of a gantry container crane cab on the basis of field surveys followed by three-dimensional computer simulation using a di...

Recherche - Transports - Sécurité, 2003

ABSTRACT

A motion simulation approach integrated into a design engineering process

... Gilles Monnier - Altran Technologies Frédéric Renard - Altran Technologies Adrien Chameroy - ... more

A Database of Ingress / Egress Motions of Elderly People

SAE Technical Paper Series, 2007

ABSTRACT

An Approach to Record Human Hand Movement which Combines Two Complementary Measurement Systems: A Data Glove and a Motion Analysis System

SAE Technical Paper Series, 2006

From Motion Capture to Motion Simulation: An In-vehicle Reach Motion Database for Car Design

SAE Technical Paper Series, 2006

Validation of a Model-based Motion Reconstruction Method Developed in the REALMAN Project

SAE Technical Paper Series, 2005

Realistic motion reconstruction is the first step for 'human like' motion simulation by a... more Realistic motion reconstruction is the first step for 'human like' motion simulation by a digital human. In a recent European research project REALMAN (IST 2000-29357), a model-based motion reconstruction method from external marker trajectories was developed. It consists of two steps. The first one is to define a digital twin of a real subject using the technique of superimposing a digital human model upon at least two photos of different view, and identifying marker positions on it. In a second step, joint angles are estimated by using a kinematic model of the human body which is described using natural coordinates: coordinates of points and components of unit vectors for defining the joint locations. The model includes a detailed description of the torso, arms and legs, with simplified hands and feet. A total of 26 joints are used, connecting 27 rigid links, among them 6 located on the spine. The joint angles are calculated by minimizing the distance between markers located on the model and the experimentally measured marker positions, requiring the solution of a nonlinear constrained optimization problem arising from kinematic and driver constraints. The purpose of this paper is to present a validation study of this motion reconstruction method. Its advantages and limitations will also be discussed. Validation was made on two types of seated arm reaching movements carried out at INRETS: seat belt reaches and generic reaches. In total, 44 individual digital twins were defined. The comparison with measured anthropometric dimensions has shown that the accuracy of the digital twins depends on static posture used. Good results with an error of less than 30 mm in average were obtained using a standing 'pharaon' posture. However, a big difference was observed for the sitting height from the sitting posture. Its average difference reached to 44 mm. Concerning the validation of motion reconstruction, more than 90% of captured motions were successfully reconstructed for both seat belt and generic arm reach movements.

ISB recommendation on definitions of joint coordinate system of various joints for the reporting of human joint motion—part I: ankle, hip, and spine

Journal of Biomechanics, 2002

The Standardization and Terminology Committee (STC) of the International Society of Biomechanics ... more The Standardization and Terminology Committee (STC) of the International Society of Biomechanics (ISB) proposes a general reporting standard for joint kinematics based on the Joint Coordinate System (JCS), first proposed by Grood and Suntay for the knee joint in 1983 (J. Biomech. Eng. 105 (1983) 136). There is currently a lack of standard for reporting joint motion in the field of biomechanics for human movement, and the JCS as proposed by Grood and Suntay has the advantage of reporting joint motions in clinically relevant terms. In this communication, the STC proposes definitions of JCS for the ankle, hip, and spine. Definitions for other joints (such as shoulder, elbow, hand and wrist, temporomandibular joint (TMJ), and whole body) will be reported in later parts of the series. The STC is publishing these recommendations so as to encourage their use, to stimulate feedback and discussion, and to facilitate further revisions. For each joint, a standard for the local axis system in each articulating bone is generated. These axes then standardize the JCS.

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An experimental investigation on the requirement of roof height and sill width for car ingress and egress

Ergonomics, 2012

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A geometric algorithm to predict the arm reach posture for computer-aided ergonomic evaluation

The Journal of Visualization and Computer Animation, 1998

Simulation of task-oriented human postures is one of the essential functions of a computerized hu... more Simulation of task-oriented human postures is one of the essential functions of a computerized human model for making reach, vision and fit analyses in a computer-aided design environment. After reviewing different existing methods of posture prediction, a geometric inverse kinematic algorithm to predict arm reach postures has been proposed, based on the criterion of minimization of the norm of joint angular velocities. The arm is modelled as a four-degrees-of-freedom kinematic linkage system, three for the shoulder and one for the elbow. A detailed three-dimensional description of the shoulder joint motion range is given. The main advantage of the proposed method is that it can take into account the non-linearity of the shoulder joint limit in a direct and easy way. Another important advantage is that no matrix inverse calculation is needed, thus reducing the calculation time. Experimental validation shows that the arm reach postures predicted by the proposed method are very close to the real ones in a large arm-reachable space. If initial arm postures are not too awkward, no additional manipulation is needed to correct the predicted arm reach posture from a visual criterion. The proposed method of arm posture prediction can be used as an efficient arm posture manipulation primitive.

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Three-dimensional kinematic analysis of influence of hand orientation and joint limits on the control of arm postures and movements

Biological Cybernetics, 1999

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Biomechanical evaluation of the comfort of automobile clutch pedal operation

International Journal of Industrial Ergonomics, 2004

The objective of the present study is to investigate not only the subjective comfort perception o... more The objective of the present study is to investigate not only the subjective comfort perception of clutch pedal operation, but also possible correlations between subjective rating and biomechanical parameters such as joint angle, moment and work for a better understanding of discomfort. The influence of four main design parameters of clutch pedal (seat height, pedal travel, pedal travel inclination, pedal resistance) was studied using a multi-adjustable experimental driving package. Fifteen subjects participated in the experiment. They were five short females, five average-height males and five tall males. Comfort was evaluated using a general comfort rating scale. The relationship between comfort rating and biomechanical parameters was explored. Globally, the results from the biomechanical evaluation of comfort/discomfort are consistent with those from the subjective evaluation. Both agree with the principle of minimum work, observed in biomechanical analysis of leg movements. This is characterized by the preference of not raising the leg during the approach phase, and the preference of low joint work at the knee and hip during the depression phase. Practical recommendations of clutch pedal design are discussed and suggested. Relevance to industry The results of the present study can aid ergonomists in understanding the discomfort caused by foot control operations as well as in the design of pedal controls.

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A Data-Based Approach for Predicting Variation Range of Hand and Foot Maximum Force on a Control

Advances in Human Factors and Ergonomics Series, 2010

An Experimental Investigation of the Discomfort of Arm Reaching Movements in a Seated Position

SAE Technical Paper Series, 2004

A comparison of clutching movements of freely adjusted and imposed pedal configurations for identifying discomfort assessment criteria

Applied ergonomics, 2014

Recherche - Transports - Sécurité, 2003

ABSTRACT

A motion simulation approach integrated into a design engineering process

... Gilles Monnier - Altran Technologies Frédéric Renard - Altran Technologies Adrien Chameroy - ... more

A Database of Ingress / Egress Motions of Elderly People

SAE Technical Paper Series, 2007

ABSTRACT

An Approach to Record Human Hand Movement which Combines Two Complementary Measurement Systems: A Data Glove and a Motion Analysis System

SAE Technical Paper Series, 2006

From Motion Capture to Motion Simulation: An In-vehicle Reach Motion Database for Car Design

SAE Technical Paper Series, 2006

Validation of a Model-based Motion Reconstruction Method Developed in the REALMAN Project

SAE Technical Paper Series, 2005

ISB recommendation on definitions of joint coordinate system of various joints for the reporting of human joint motion—part I: ankle, hip, and spine

Journal of Biomechanics, 2002

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An experimental investigation on the requirement of roof height and sill width for car ingress and egress

Ergonomics, 2012

Download

A geometric algorithm to predict the arm reach posture for computer-aided ergonomic evaluation

The Journal of Visualization and Computer Animation, 1998

Download

Three-dimensional kinematic analysis of influence of hand orientation and joint limits on the control of arm postures and movements

Biological Cybernetics, 1999

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Biomechanical evaluation of the comfort of automobile clutch pedal operation

International Journal of Industrial Ergonomics, 2004

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