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Joyce Zwiener - One of the best experts on this subject based on the ideXlab platform.
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Impact of Harness fit on suspension tolerance.
Human factors, 2012Co-Authors: Hongwei Hsiao, Nina L. Turner, Richard Whisler, Joyce ZwienerAbstract:Objective: This study investigated the effect of body size and shape and Harness fit on suspension tolerance time. Background: Fall victims may develop suspension trauma, a potentially fatal reduction of return blood flow from legs to the heart and brain, after a successfully arrested fall if they are not rescued quickly or the Harness does not fit them well. Method: For this study, 20 men and 17 women with construction experience were suspended from the dorsal D-ring of a full-body fall-arrest Harness. Their suspension tolerance time, physical characteristics, and Harness fit levels were assessed. Results: Body characteristics (i.e., weight, stature, upper- and lower-torso depths) were associated with decreased suspension tolerance time (r = –.36 ~ –.45, p ≤ .03). In addition, Harness fit affected suspension tolerance time; workers with a torso angle of suspension greater than 35°, a thigh strap angle greater than 50°, or a poorly fitting Harness size had shorter suspension tolerance time (mean differences = 14, 11, and 9.8 min, respectively, p ≤ .05). Conclusion: Body size and Harness fit were predictors of suspension tolerance time. Selecting wellfit Harnesses and establishing a 9-min rescue plan are suggested to ensure that no more than 5% of workers would experience suspension trauma. Applications: The study provides a basis for Harness designers, standards writers, and manufacturers to improve Harness configurations and testing requirements for better worker protection against suspension trauma.
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Suspension tolerance in a full-body safety Harness, and a prototype Harness accessory.
Journal of occupational and environmental hygiene, 2008Co-Authors: Nina L. Turner, James T. Wassell, Richard Whisler, Joyce ZwienerAbstract:Workers wearing full-body safety Harnesses are at risk for suspension trauma if they are not rescued in 5 to 30 min after a successfully arrested fall. Suspension trauma, which may be fatal, occurs when a person's legs are immobile in a vertical posture, leading to the pooling of blood in the legs, pelvis, and abdomen, and the reduction of return blood flow to the heart and brain. To measure suspension tolerance time, 22 men and 18 women with construction experience were suspended from the chest D-ring (CHEST) and back D-ring (BACK) of full-body, fall-arrest Harnesses. Fifteen men and 13 women from the original group of subjects were then suspended using a newly developed National Institute for Occupational Safety and Health Harness accessory (ACCESS), which supports the upper legs. Midthigh circumference changes were 1.4 and 1.9 cm, changes in minute ventilation were 1.2 and 1.5 L/min, changes in heart rate (HR) were 15.1 and 21.6 bpm, and changes in mean arterial pressure were 5.1 and −2.6 mmHg (p ≤ 0.0...
Hongwei Hsiao - One of the best experts on this subject based on the ideXlab platform.
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Impact of Harness fit on suspension tolerance.
Human factors, 2012Co-Authors: Hongwei Hsiao, Nina L. Turner, Richard Whisler, Joyce ZwienerAbstract:Objective: This study investigated the effect of body size and shape and Harness fit on suspension tolerance time. Background: Fall victims may develop suspension trauma, a potentially fatal reduction of return blood flow from legs to the heart and brain, after a successfully arrested fall if they are not rescued quickly or the Harness does not fit them well. Method: For this study, 20 men and 17 women with construction experience were suspended from the dorsal D-ring of a full-body fall-arrest Harness. Their suspension tolerance time, physical characteristics, and Harness fit levels were assessed. Results: Body characteristics (i.e., weight, stature, upper- and lower-torso depths) were associated with decreased suspension tolerance time (r = –.36 ~ –.45, p ≤ .03). In addition, Harness fit affected suspension tolerance time; workers with a torso angle of suspension greater than 35°, a thigh strap angle greater than 50°, or a poorly fitting Harness size had shorter suspension tolerance time (mean differences = 14, 11, and 9.8 min, respectively, p ≤ .05). Conclusion: Body size and Harness fit were predictors of suspension tolerance time. Selecting wellfit Harnesses and establishing a 9-min rescue plan are suggested to ensure that no more than 5% of workers would experience suspension trauma. Applications: The study provides a basis for Harness designers, standards writers, and manufacturers to improve Harness configurations and testing requirements for better worker protection against suspension trauma.
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Evaluation of fall arrest Harness sizing schemes.
Human factors, 2007Co-Authors: Hongwei Hsiao, Jennifer Whitestone, Tsui-ying KauAbstract:Objective: This paper evaluated Harness sizing schemes and anthropometric criteria for Harness design applications. Background: Updated Harness sizing systems are needed to accommodate diverse populations in the current workforce. Method: Three-dimensional torso scan data and human-Harness interfaces from 108 women and 108 men were digitally captured. Abounding box approach was employed to quantify the effect of torso shape and size on fall Harness fit. Results: A logistic regression model with eight equations was developed and tested to classify more than 96% of participants to the best-fitting size. Conclusion: Study outcomes suggested an alternative system of two sizes for women and three sizes for men over the current four-size unisex system. In addition, thigh strap angle and back D ring location could be utilized along with current Harness static fit test criteria to further enhance postfall Harness fit predictions. Application: This research could help reduce the risk of worker injury resulting from poor fit, improper size selection, or failure to don the Harness properly.
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Sizing and fit of fall-protection Harnesses
Ergonomics, 2003Co-Authors: Hongwei Hsiao, Bruce Bradtmiller, Jennifer WhitestoneAbstract:Full-body fall-protection Harnesses have been a critical work-practice control technology for reducing the number of fall-related injuries and fatalities among construction workers; yet, very little is known about the fit of these Harnesses to the population that wears them. This study evaluated the fit and sizing efficacy of a Harness system. Seventy-two male and 26 female construction workers participated in the study. Their body size-and-shape information was measured while they were suspended (with a Harness) and standing (with and without a Harness), using a 3-D full-body laser scanner and traditional anthropometric calipers. Fisher's discriminant analysis results did not point to the need for a change in the current sizing selection scheme by body height and weight for end users. However, an integrated redesign of Harness components is needed because 40% of subjects did not pass fit-performance criteria in either the standing or suspended condition. A multivariate accommodation analysis has identified 15 representative body models for the 'standard-size' Harness design. These models can serve as a useful population to test Harness design until a larger survey of the nation's construction workers can be done. Finally, further developments in 3-D shape quantification methods are recommended to improve the Harness design process; the point-to-point anthropometric information currently used seems to be insufficient for Harness design.
Nina L. Turner - One of the best experts on this subject based on the ideXlab platform.
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Impact of Harness fit on suspension tolerance.
Human factors, 2012Co-Authors: Hongwei Hsiao, Nina L. Turner, Richard Whisler, Joyce ZwienerAbstract:Objective: This study investigated the effect of body size and shape and Harness fit on suspension tolerance time. Background: Fall victims may develop suspension trauma, a potentially fatal reduction of return blood flow from legs to the heart and brain, after a successfully arrested fall if they are not rescued quickly or the Harness does not fit them well. Method: For this study, 20 men and 17 women with construction experience were suspended from the dorsal D-ring of a full-body fall-arrest Harness. Their suspension tolerance time, physical characteristics, and Harness fit levels were assessed. Results: Body characteristics (i.e., weight, stature, upper- and lower-torso depths) were associated with decreased suspension tolerance time (r = –.36 ~ –.45, p ≤ .03). In addition, Harness fit affected suspension tolerance time; workers with a torso angle of suspension greater than 35°, a thigh strap angle greater than 50°, or a poorly fitting Harness size had shorter suspension tolerance time (mean differences = 14, 11, and 9.8 min, respectively, p ≤ .05). Conclusion: Body size and Harness fit were predictors of suspension tolerance time. Selecting wellfit Harnesses and establishing a 9-min rescue plan are suggested to ensure that no more than 5% of workers would experience suspension trauma. Applications: The study provides a basis for Harness designers, standards writers, and manufacturers to improve Harness configurations and testing requirements for better worker protection against suspension trauma.
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Suspension tolerance in a full-body safety Harness, and a prototype Harness accessory.
Journal of occupational and environmental hygiene, 2008Co-Authors: Nina L. Turner, James T. Wassell, Richard Whisler, Joyce ZwienerAbstract:Workers wearing full-body safety Harnesses are at risk for suspension trauma if they are not rescued in 5 to 30 min after a successfully arrested fall. Suspension trauma, which may be fatal, occurs when a person's legs are immobile in a vertical posture, leading to the pooling of blood in the legs, pelvis, and abdomen, and the reduction of return blood flow to the heart and brain. To measure suspension tolerance time, 22 men and 18 women with construction experience were suspended from the chest D-ring (CHEST) and back D-ring (BACK) of full-body, fall-arrest Harnesses. Fifteen men and 13 women from the original group of subjects were then suspended using a newly developed National Institute for Occupational Safety and Health Harness accessory (ACCESS), which supports the upper legs. Midthigh circumference changes were 1.4 and 1.9 cm, changes in minute ventilation were 1.2 and 1.5 L/min, changes in heart rate (HR) were 15.1 and 21.6 bpm, and changes in mean arterial pressure were 5.1 and −2.6 mmHg (p ≤ 0.0...
Richard Whisler - One of the best experts on this subject based on the ideXlab platform.
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Impact of Harness fit on suspension tolerance.
Human factors, 2012Co-Authors: Hongwei Hsiao, Nina L. Turner, Richard Whisler, Joyce ZwienerAbstract:Objective: This study investigated the effect of body size and shape and Harness fit on suspension tolerance time. Background: Fall victims may develop suspension trauma, a potentially fatal reduction of return blood flow from legs to the heart and brain, after a successfully arrested fall if they are not rescued quickly or the Harness does not fit them well. Method: For this study, 20 men and 17 women with construction experience were suspended from the dorsal D-ring of a full-body fall-arrest Harness. Their suspension tolerance time, physical characteristics, and Harness fit levels were assessed. Results: Body characteristics (i.e., weight, stature, upper- and lower-torso depths) were associated with decreased suspension tolerance time (r = –.36 ~ –.45, p ≤ .03). In addition, Harness fit affected suspension tolerance time; workers with a torso angle of suspension greater than 35°, a thigh strap angle greater than 50°, or a poorly fitting Harness size had shorter suspension tolerance time (mean differences = 14, 11, and 9.8 min, respectively, p ≤ .05). Conclusion: Body size and Harness fit were predictors of suspension tolerance time. Selecting wellfit Harnesses and establishing a 9-min rescue plan are suggested to ensure that no more than 5% of workers would experience suspension trauma. Applications: The study provides a basis for Harness designers, standards writers, and manufacturers to improve Harness configurations and testing requirements for better worker protection against suspension trauma.
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Suspension tolerance in a full-body safety Harness, and a prototype Harness accessory.
Journal of occupational and environmental hygiene, 2008Co-Authors: Nina L. Turner, James T. Wassell, Richard Whisler, Joyce ZwienerAbstract:Workers wearing full-body safety Harnesses are at risk for suspension trauma if they are not rescued in 5 to 30 min after a successfully arrested fall. Suspension trauma, which may be fatal, occurs when a person's legs are immobile in a vertical posture, leading to the pooling of blood in the legs, pelvis, and abdomen, and the reduction of return blood flow to the heart and brain. To measure suspension tolerance time, 22 men and 18 women with construction experience were suspended from the chest D-ring (CHEST) and back D-ring (BACK) of full-body, fall-arrest Harnesses. Fifteen men and 13 women from the original group of subjects were then suspended using a newly developed National Institute for Occupational Safety and Health Harness accessory (ACCESS), which supports the upper legs. Midthigh circumference changes were 1.4 and 1.9 cm, changes in minute ventilation were 1.2 and 1.5 L/min, changes in heart rate (HR) were 15.1 and 21.6 bpm, and changes in mean arterial pressure were 5.1 and −2.6 mmHg (p ≤ 0.0...
Liu Xiao-ping - One of the best experts on this subject based on the ideXlab platform.
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Flexible Wire Harness Process Design Modeling
Journal of Engineering Graphics, 2010Co-Authors: Liu Xiao-pingAbstract:Process design is an important step in wire Harness design,but it is quite difficult to develop CAD software for wire Harness process design based on different general CAD platforms,for the displaying styles of wire Harness drawings of different corporations are various.In this ariticle,a flexible model for wire Harness process design is established,which encapsulates dissimilar displaying styles of wire Harness drawings and can be easily applied to specific general CAD platform.Given m kinds of display styles and n kinds of general CAD platforms,m*n kinds of combinations between m and n are reduced to one domain model and additional m+n modules with the method presented in the paper.This method features good extensibility and configurability and can serve to build modular wire Harness software.
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Research on Automatic Layout of Wire-Harness Connection Graph Based on Force-directed Algorithm
Journal of Engineering Graphics, 2010Co-Authors: Liu Xiao-pingAbstract:Wire Harness connection graph(WHCG),consisting of wire Harness segments,is a connected acyclic graph generated from wire Harness drawing after removing the wire Harness connectors.WHCG,the main component of automatic layout of wire Harness drawing,represents the connection of wire Harness connectors and determines the layout skeleton of wire Harness drawing.The paper introduces the force-directed layout models and algorithms from the undirected graph layout theory into automobile WHCG’s automatic layout,the trunk search algorithm for WHCG and constrained symmetrical layout of wire Harness branches are given,based on which the WHCG’s layout is formulated,providing the effective methods and techniques for automatic layout of automobile wire Harness drawing.
