Comparison of visibility measurement techniques for forklift truck design factors

Choi, Chin Bong; Park, Peom; Kim, Young Ho; Hallbeck, M. Susan; Jung, Myung‐Chul

doi:10.1016/j.apergo.2008.04.012

Cited by 14 publications

(10 citation statements)

References 12 publications

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“…Barron et al (2005b) used a light source and a series of light sensors and derived a contour plot of the visibility index to quantify the masking effect of obstructions on the light source, as well as to map the blind areas caused by inherent obstructions in the operator's field of view. Choi et al (2009) compared three different visibility measurement techniques, such as the light bulb shadow test, manikin vision assessment test, and an individual test for a fork lift truck, to identify design factors influencing visibility. Ray and Teizer (2011) demonstrated the feasibility of creating dynamic blind spot diagrams by integrating blind spot maps for static equipment with automated estimation of head pose of construction equipment operators.…”

Section: Introductionmentioning

confidence: 99%

Visibility Evaluation for Agricultural Tractor Operators According to ISO 5006 and 5721-1 Standards

Kabir

Song

Chung

et al. 2015

Journal of Biosystems Engineering

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Purpose: A system to measure the visibility of agricultural tractor operators was designed and evaluated according to ISO standards, and a blind area diagram around the tested tractor was created based on the manual method recommended by the National Institute for Occupational Safety and Health (NIOSH). Methods: A visibility measurement system was designed and evaluated based on the ISO 5006 and ISO 5721-1 standards. Two bulbs used to simulate the operator's eyes were mounted on a bar with a supporting frame. A wooden frame was used to determine the seat index point position. The 12-m visibility test circle was divided into six sectors of vision, and the test tractor was placed at the center of the circle. Artificial light was supplied in the darkened environment, and shadow or masking effects were measured manually around the 12-m circle. Results: When the bulbs were placed at the operator's eye level, front visibility was good; no masking was found in the "A" vision sector, but larger masking widths were found in the "B" and "C" vision sectors. Since the masking width exceeded 700 mm, additional tests, such as movement of the light sources to both sides of the operator's eye level, were performed. Less than six masking effects were found in the semi-circle of vision to the front, and more than one masking was found in the "B" and "C" visual fields. The minimum distance between the centers of two masking effects exceeded 2500 mm when measured as a chord on the semi-circle of vision. A blind area diagram was created to define the exact nature of the blind spots and mirror visibility. Conclusions: Visibility evaluation is an effective way to enable proper and safe operation for agricultural tractor operators. Inclusion of this visibility evaluation test in the general testing process might aid tractor manufacturers.

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Section: Introductionmentioning

confidence: 99%

Visibility Evaluation for Agricultural Tractor Operators According to ISO 5006 and 5721-1 Standards

Kabir

Song

Chung

et al. 2015

Journal of Biosystems Engineering

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“…The method used viewpoints, both inside and outside, of Far East combine harvesters. Choi et al (2009) studied the visibility of a forklift truck using the light bulb shadow test, a digital human model and real participants. They found that the evaluation with real participants provided better visibility results.…”

Section: Related Workmentioning

confidence: 99%

Virtual prototyping in the design of see-through features in mobile machinery

2019

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Limited visibility from a mobile machine cab can decrease task performance and lead to accidents. Therefore, it is important to consider visibility issues already in the design phase. This paper describes the use of virtual prototyping in the evaluation of see-through features of mobile work machines. The goal is to evaluate whether two different machine boom transparency levels have an effect on task performance. In addition, two alternative placements of overlaid information in the operators' field of view are assessed. A within-subject design was used in this study. Based on the results, there was no significant difference in performance between the transparency levels. However, the test participants preferred a transparency level of 70-80% (where 0% is completely opaque). Similar results were found with the placement of the overlaid information, which had no significant effect on task performance. Both placements, on the windscreen and on the tunnel wall, were equally favoured by the participants. The findings of this study contribute to the design of see-through features for mobile work machines. In addition, the study demonstrates the use of virtual prototyping in the design of novel features in human-machine systems.

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“…Alison Godwin et al [5] studied on the implications of articulating machinery on operator line of sight and efficacy of additional camera locations. Three assessment test were utilized to identify forklift truck design factors for influencing visibility of operators [6]. As mentioned above, several studies have been done to improve the structure and shape of bulldozer.…”

Section: Introductionmentioning

confidence: 99%

Design optimization method of line-of-sight with JACK for bulldozer operator

Mei-ni

2018

MATEC Web Conf.

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The objective of this article is to investigate the line-of-sight (LOS) and visual areas in order to provide a lower risk of accident and a best available view for the operator of industry machine. This paper presented a method of simulating an bulldozer operation in a virtual environment for the sake of analyzing LOS of the operator during conditions of load and unload respectively. Coverage zone tool in the JACK software was utilized to calculate the percentage of visible zones from the virtual operator’s position. At the same time, the modification of design with additional cameras was proposed based on the results of LOS analysis, which significantly improved compared with original design. The results of this study proved that the modifications (with visual monitoring system) could improve visibility of bulldozer operators to some extent according to the optimization method.

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Comparison of visibility measurement techniques for forklift truck design factors

Cited by 14 publications

References 12 publications

Visibility Evaluation for Agricultural Tractor Operators According to ISO 5006 and 5721-1 Standards

Visibility Evaluation for Agricultural Tractor Operators According to ISO 5006 and 5721-1 Standards

Virtual prototyping in the design of see-through features in mobile machinery

Design optimization method of line-of-sight with JACK for bulldozer operator

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