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Effect of Control System Augmentation on Handling Qualities and Task Performance in Good and Degraded Visual Environments.

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Title: Effect of Control System Augmentation on Handling Qualities and Task Performance in Good and Degraded Visual Environments.
Authors: Theodore, Colin R.1 colin.theodore@nasa.gov, Malpica, Carlos A.1, Blanken, Christopher L.2, Tischler, Mark B.2, Berger, Tom2, Lawrence, Ben3, Lindsey, James E.4
Source: Journal of the American Helicopter Society. 2020, Vol. 65 Issue 4, p042007-1-042007-14. 14p.
Subjects: Visual environment, Task performance, Emergency medical services, Vertical motion, Night vision, Lifting & carrying (Human mechanics), Task analysis
Abstract: An experiment in the NASA-Ames Vertical Motion Simulator examined and quantified the effects of limited-authority control system augmentation on handling qualities and task performance in varying visual environments. The simulated vehicle was the OH-58D with similar characteristics to the Bell 407 civilian helicopter often used for emergency medical services. The control systems investigated were a baseline rate command system, a short-term attitude command/attitude hold system, a "modernized control laws" system that provides an attitude command/attitude hold control response type, and modernized control laws with a position hold function. Evaluation tasks included a number of ADS-33 mission task elements, as well as a proposed emergency medical services task consisting of an approach and landing at a minimally prepared landing site. Degraded visual environments were simulated with an unaided night scene and using night vision goggles. Results showed that handling qualities ratings were improved with a control system providing short-term attitude response over a rate command system, although the improvements were not sufficient to produce Level 1 handling qualities in degraded visual environments. Using modernized control laws showed that borderline Level 1 handling qualities could be achieved in degraded visual environments using a 10% authority stability augmentation system. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the American Helicopter Society is the property of American Helicopter Society dba Vertical Flight Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
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PubTypeId: academicJournal
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  Data: Effect of Control System Augmentation on Handling Qualities and Task Performance in Good and Degraded Visual Environments.
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  Data: <searchLink fieldCode="AR" term="%22Theodore%2C+Colin+R%2E%22">Theodore, Colin R.</searchLink><relatesTo>1</relatesTo><i> colin.theodore@nasa.gov</i><br /><searchLink fieldCode="AR" term="%22Malpica%2C+Carlos+A%2E%22">Malpica, Carlos A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Blanken%2C+Christopher+L%2E%22">Blanken, Christopher L.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Tischler%2C+Mark+B%2E%22">Tischler, Mark B.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Berger%2C+Tom%22">Berger, Tom</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lawrence%2C+Ben%22">Lawrence, Ben</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Lindsey%2C+James+E%2E%22">Lindsey, James E.</searchLink><relatesTo>4</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Helicopter+Society%22">Journal of the American Helicopter Society</searchLink>. 2020, Vol. 65 Issue 4, p042007-1-042007-14. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Visual+environment%22">Visual environment</searchLink><br /><searchLink fieldCode="DE" term="%22Task+performance%22">Task performance</searchLink><br /><searchLink fieldCode="DE" term="%22Emergency+medical+services%22">Emergency medical services</searchLink><br /><searchLink fieldCode="DE" term="%22Vertical+motion%22">Vertical motion</searchLink><br /><searchLink fieldCode="DE" term="%22Night+vision%22">Night vision</searchLink><br /><searchLink fieldCode="DE" term="%22Lifting+%26+carrying+%28Human+mechanics%29%22">Lifting & carrying (Human mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Task+analysis%22">Task analysis</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: An experiment in the NASA-Ames Vertical Motion Simulator examined and quantified the effects of limited-authority control system augmentation on handling qualities and task performance in varying visual environments. The simulated vehicle was the OH-58D with similar characteristics to the Bell 407 civilian helicopter often used for emergency medical services. The control systems investigated were a baseline rate command system, a short-term attitude command/attitude hold system, a "modernized control laws" system that provides an attitude command/attitude hold control response type, and modernized control laws with a position hold function. Evaluation tasks included a number of ADS-33 mission task elements, as well as a proposed emergency medical services task consisting of an approach and landing at a minimally prepared landing site. Degraded visual environments were simulated with an unaided night scene and using night vision goggles. Results showed that handling qualities ratings were improved with a control system providing short-term attitude response over a rate command system, although the improvements were not sufficient to produce Level 1 handling qualities in degraded visual environments. Using modernized control laws showed that borderline Level 1 handling qualities could be achieved in degraded visual environments using a 10% authority stability augmentation system. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of the American Helicopter Society is the property of American Helicopter Society dba Vertical Flight Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.4050/JAHS.65.042007
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      – Code: eng
        Text: English
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        PageCount: 14
        StartPage: 042007-1
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      – SubjectFull: Visual environment
        Type: general
      – SubjectFull: Task performance
        Type: general
      – SubjectFull: Emergency medical services
        Type: general
      – SubjectFull: Vertical motion
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      – SubjectFull: Night vision
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      – SubjectFull: Lifting & carrying (Human mechanics)
        Type: general
      – SubjectFull: Task analysis
        Type: general
    Titles:
      – TitleFull: Effect of Control System Augmentation on Handling Qualities and Task Performance in Good and Degraded Visual Environments.
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            NameFull: Berger, Tom
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              Text: 2020
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