Development and design of a dynamic armrest for hydraulic-actuation joystick controlled mobile machines

Murphy, T.; Oliver, Michele

doi:10.1016/j.apergo.2007.09.002

Cited by 11 publications

(8 citation statements)

References 13 publications

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“…In the videos, where the operators' hands were visible, we can also observe that operating a forest harvester involves excessive controls of the joysticks. This situation may cause muscular strains on the operator's hands in the long term if the design of the armrests, including the joysticks, does not match with the operator's physical needs [22].…”

Section: Ergonomic Issues In Operating Forest Harvestersmentioning

confidence: 99%

Analyzing Online Videos: A Complement to Field Studies in Remote Locations

Sitompul

Wallmyr

2019

Human-Computer Interaction – INTERACT 2019

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The paper presents a complementary method, called online video study, to conducting field studies in remote locations, by using available videos on YouTube. There are two driving factors for the online video study. Firstly, there are some occasions where conducting field studies are difficult, for example, due to the remoteness of the location where the research subject is located. Secondly, there is a growing interest among researchers to use available data on the internet as their research data source. To give a context, the study specifically investigates how operators of forest harvesters work in their natural settings. The online video study was started by collecting suitable videos on YouTube using certain criteria. We found 26 videos that meet our criteria, which also provide diverse samples of forest harvesters, operators, and working situations. We used five prior field studies, which investigated forest harvesters-related issues, to evaluate the feasibility of our approach. The results of the online video study method are promising, since we are able to find answers for research questions that we have predefined. The paper does not only contribute to the understanding of how operators of forest harvesters work in natural settings, but also the feasibility of conducting the online video study, which can be utilized when the research subject is located in remote locations.

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Section: Ergonomic Issues In Operating Forest Harvestersmentioning

confidence: 99%

Analyzing Online Videos: A Complement to Field Studies in Remote Locations

Sitompul

Wallmyr

2019

Human-Computer Interaction – INTERACT 2019

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“…The implementation of a pendulating armrest, one that will move with two degrees of freedom in the sagittal plane (i.e., translation and rotation), allows a more natural movement pattern (Murphy and Oliver, 2008). This armrest is capable of replicating the natural movement of the forearm and consequently provides support throughout the range of motion.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the above assumptions, an armrest was developed that replicated the trajectories of an operator's forearm during unrestricted joystick manipulation (Murphy and Oliver, 2008). The armrest travels on bearings that follow fixed trajectories that are components of the arm support structure that is mounted to the operator's chair.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a dynamic armrest for hydraulic-actuation controller use

Murphy¹,

Oliver²

2011

Applied Ergonomics

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“…This is likely because stationary armrests are designed to support a stationary arm, not a moving arm. During joystick manipulation, the arm lifts off a stationary armrest during forward, left, and right movements, and the arm support impedes the downward movement of the elbow during backward joystick movements [16].…”

Section: Introductionmentioning

confidence: 99%

“…Building on work by Attebrant et al [1], another fore-aft dynamic armrest was designed and validated [16,17]. The motion of the elbow and wrist was tracked during fore-aft joystick manipulation without an armrest, and a dynamic armrest was designed to mimic this movement.…”

Section: Introductionmentioning

confidence: 99%

Design of a horizontally dynamic armrest for joystick controlled mobile equipment

Boucher¹,

Oliver²

2018

OER

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BACKGROUND: Joystick operators often experience constant low level muscle loading in the upper limb when using joysticks, which can lead to repetitive strain injuries. It has been hypothesized that the strain on the muscles may be reduced by supporting the arm during joystick manipulation. OBJECTIVE: To design a horizontally dynamic armrest which appropriately supports the motion of the forearm during sideto-side joystick movements. METHODS: The paper describes the process used to design a dynamic armrest which appropriately supports an operator's arm throughout the range of side-to-side joystick movements. RESULTS: The trajectory of the elbow and wrist during these joystick movements was determined, and a new horizontally dynamic armrest designed and built. CONCLUSIONS: Most heavy mobile equipment seat armrests fail to provide appropriate support throughout the range of joystick motion resulting in constant upper body muscle loading. Our paper describes the development of a dynamic armrest which is designed to provide appropriate support throughout side-to-side joystick movements.

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Development and design of a dynamic armrest for hydraulic-actuation joystick controlled mobile machines

Cited by 11 publications

References 13 publications

Analyzing Online Videos: A Complement to Field Studies in Remote Locations

Analyzing Online Videos: A Complement to Field Studies in Remote Locations

Evaluation of a dynamic armrest for hydraulic-actuation controller use

Design of a horizontally dynamic armrest for joystick controlled mobile equipment

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