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A Method for Compensation of Interactions Between Second-Order Actuators and Control Allocators

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Název: A Method for Compensation of Interactions Between Second-Order Actuators and Control Allocators
Autoři: Oppenheimer, Michael W., Doman, David B.
Přispěvatelé: AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
Zdroj: DTIC
Rok vydání: 2005
Sbírka: Defense Technical Information Center: DTIC Technical Reports database
Témata: Flight Control and Instrumentation, Numerical Mathematics, Electrical and Electronic Equipment, Air Navigation and Guidance, ALGORITHMS, INTERACTIONS, ACTUATORS, CONTROL SURFACES, LINEAR SYSTEMS, LINEAR PROGRAMMING, ATTENUATION, DYNAMICS, FLIGHT CONTROL SYSTEMS, CONTROL DESIGN, CONTROL ALLOCATION ALGORITHM, CONSTRAINED CONTROL ALLOCATORS, CONTROL EFFECTOR, ACTUATOR DYNAMICS
Popis: Typically, actuator dynamics are ignored when designing flight control allocators for aircraft because the bandwidths of actuators are normally much larger than the frequencies of the vehicle's rigid body modes. Unfortunately, this is not always the case, particularly when dealing with non-aerodynamic surface actuators. Ignoring the interactions between constrained control allocators and actuator dynamics can have serious consequences. In this work, a method, which post-processes the output of a control allocation algorithm, is developed to compensate for actuator dynamics. The actuators can have dynamics which are either first-order, second-order with no zeros, or second-order with a single zero. The method developed here solves for a gain, which multiplies the commanded change in control effector setting as computed by the control allocator. This approach is not computationally intensive and thus has the added benefit of being an algorithm which can operate in real-time on a typical flight computer. Likewise, this approach is applicable to both the saturated and unsaturated control effector cases. The basic premise of this method is to post-process the output of the control allocation algorithm to overdrive the actuators so that at the end of a sampling interval, the actual actuator positions are equivalent to the desired actuator positions. ; IEEEAC paper no. 1164. The original document contains color images.
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Jazyk: English
Relation: http://www.dtic.mil/docs/citations/ADA445165
Dostupnost: http://www.dtic.mil/docs/citations/ADA445165
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA445165
Rights: Approved for public release; distribution is unlimited.
Přístupové číslo: edsbas.96909E89
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  Label: Title
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  Data: A Method for Compensation of Interactions Between Second-Order Actuators and Control Allocators
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  Data: <searchLink fieldCode="AR" term="%22Oppenheimer%2C+Michael+W%2E%22">Oppenheimer, Michael W.</searchLink><br /><searchLink fieldCode="AR" term="%22Doman%2C+David+B%2E%22">Doman, David B.</searchLink>
– Name: Author
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  Group: Au
  Data: AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
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  Data: DTIC
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  Label: Publication Year
  Group: Date
  Data: 2005
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  Data: Defense Technical Information Center: DTIC Technical Reports database
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  Data: <searchLink fieldCode="DE" term="%22Flight+Control+and+Instrumentation%22">Flight Control and Instrumentation</searchLink><br /><searchLink fieldCode="DE" term="%22Numerical+Mathematics%22">Numerical Mathematics</searchLink><br /><searchLink fieldCode="DE" term="%22Electrical+and+Electronic+Equipment%22">Electrical and Electronic Equipment</searchLink><br /><searchLink fieldCode="DE" term="%22Air+Navigation+and+Guidance%22">Air Navigation and Guidance</searchLink><br /><searchLink fieldCode="DE" term="%22ALGORITHMS%22">ALGORITHMS</searchLink><br /><searchLink fieldCode="DE" term="%22INTERACTIONS%22">INTERACTIONS</searchLink><br /><searchLink fieldCode="DE" term="%22ACTUATORS%22">ACTUATORS</searchLink><br /><searchLink fieldCode="DE" term="%22CONTROL+SURFACES%22">CONTROL SURFACES</searchLink><br /><searchLink fieldCode="DE" term="%22LINEAR+SYSTEMS%22">LINEAR SYSTEMS</searchLink><br /><searchLink fieldCode="DE" term="%22LINEAR+PROGRAMMING%22">LINEAR PROGRAMMING</searchLink><br /><searchLink fieldCode="DE" term="%22ATTENUATION%22">ATTENUATION</searchLink><br /><searchLink fieldCode="DE" term="%22DYNAMICS%22">DYNAMICS</searchLink><br /><searchLink fieldCode="DE" term="%22FLIGHT+CONTROL+SYSTEMS%22">FLIGHT CONTROL SYSTEMS</searchLink><br /><searchLink fieldCode="DE" term="%22CONTROL+DESIGN%22">CONTROL DESIGN</searchLink><br /><searchLink fieldCode="DE" term="%22CONTROL+ALLOCATION+ALGORITHM%22">CONTROL ALLOCATION ALGORITHM</searchLink><br /><searchLink fieldCode="DE" term="%22CONSTRAINED+CONTROL+ALLOCATORS%22">CONSTRAINED CONTROL ALLOCATORS</searchLink><br /><searchLink fieldCode="DE" term="%22CONTROL+EFFECTOR%22">CONTROL EFFECTOR</searchLink><br /><searchLink fieldCode="DE" term="%22ACTUATOR+DYNAMICS%22">ACTUATOR DYNAMICS</searchLink>
– Name: Abstract
  Label: Description
  Group: Ab
  Data: Typically, actuator dynamics are ignored when designing flight control allocators for aircraft because the bandwidths of actuators are normally much larger than the frequencies of the vehicle's rigid body modes. Unfortunately, this is not always the case, particularly when dealing with non-aerodynamic surface actuators. Ignoring the interactions between constrained control allocators and actuator dynamics can have serious consequences. In this work, a method, which post-processes the output of a control allocation algorithm, is developed to compensate for actuator dynamics. The actuators can have dynamics which are either first-order, second-order with no zeros, or second-order with a single zero. The method developed here solves for a gain, which multiplies the commanded change in control effector setting as computed by the control allocator. This approach is not computationally intensive and thus has the added benefit of being an algorithm which can operate in real-time on a typical flight computer. Likewise, this approach is applicable to both the saturated and unsaturated control effector cases. The basic premise of this method is to post-process the output of the control allocation algorithm to overdrive the actuators so that at the end of a sampling interval, the actual actuator positions are equivalent to the desired actuator positions. ; IEEEAC paper no. 1164. The original document contains color images.
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  Data: edsbas.96909E89
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RecordInfo BibRecord:
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    Languages:
      – Text: English
    Subjects:
      – SubjectFull: Flight Control and Instrumentation
        Type: general
      – SubjectFull: Numerical Mathematics
        Type: general
      – SubjectFull: Electrical and Electronic Equipment
        Type: general
      – SubjectFull: Air Navigation and Guidance
        Type: general
      – SubjectFull: ALGORITHMS
        Type: general
      – SubjectFull: INTERACTIONS
        Type: general
      – SubjectFull: ACTUATORS
        Type: general
      – SubjectFull: CONTROL SURFACES
        Type: general
      – SubjectFull: LINEAR SYSTEMS
        Type: general
      – SubjectFull: LINEAR PROGRAMMING
        Type: general
      – SubjectFull: ATTENUATION
        Type: general
      – SubjectFull: DYNAMICS
        Type: general
      – SubjectFull: FLIGHT CONTROL SYSTEMS
        Type: general
      – SubjectFull: CONTROL DESIGN
        Type: general
      – SubjectFull: CONTROL ALLOCATION ALGORITHM
        Type: general
      – SubjectFull: CONSTRAINED CONTROL ALLOCATORS
        Type: general
      – SubjectFull: CONTROL EFFECTOR
        Type: general
      – SubjectFull: ACTUATOR DYNAMICS
        Type: general
    Titles:
      – TitleFull: A Method for Compensation of Interactions Between Second-Order Actuators and Control Allocators
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            NameFull: Oppenheimer, Michael W.
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            NameFull: Doman, David B.
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            NameFull: AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
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