Matches in SemOpenAlex for { <https://semopenalex.org/work/W257729863> ?p ?o ?g. }
Showing items 1 to 87 of
87
with 100 items per page.
- W257729863 abstract "Abstract : Chaos is used to understand complex nonlinear dynamics. The geometric and topological methods of Chaos theory are applied, for the first time, to the study of flight test data. Data analyzed is from the OH-6A Higher Harmonic Control (HHC) test aircraft. HHC is an active control system used to suppress helicopter vibrations. Some of the first practical applications of Chaos methods are demonstrated with the HHC data. although helicopter vibrations are mostly periodic, evidence of chaos was found. The presence of a strange attractor was shown by computing a positive Lyapunov exponent and computing a non integer fractal correlation dimension. A broad band Fourier spectrum and a well defined attractor in pseudo phase space are observed. A limit exists to HHC vibration reduction due to the presence of chaos. A new technique based on a relationship between the Chaos methods (the Poincare section and Van der Pol plane) and the vibration amplitude and phase was discovered. This newly introduced technique results in the following: (1) it gives the limits of HHC vibration reduction, (2) it allows rapid determination of best phase for a HHC controller, (3) it determines the minimum HHC controller requirement for any helicopter from a few minutes duration of flight test data, (4) it shows that the HHC controller transfer matrix is linear and repeatable when the vibrations are defined in the Rotor Time Domain and that the matrix is nonlinear and nonrepeatable when the vibrations are defined in the Clock Time Domain. (jhd)" @default.
- W257729863 created "2016-06-24" @default.
- W257729863 creator A5003974106 @default.
- W257729863 date "1990-03-01" @default.
- W257729863 modified "2023-09-26" @default.
- W257729863 title "Application of Chaos Methods to Helicopter Vibration Reduction Using Higher Harmonic Control" @default.
- W257729863 hasPublicationYear "1990" @default.
- W257729863 type Work @default.
- W257729863 sameAs 257729863 @default.
- W257729863 citedByCount "4" @default.
- W257729863 crossrefType "journal-article" @default.
- W257729863 hasAuthorship W257729863A5003974106 @default.
- W257729863 hasConcept C110601934 @default.
- W257729863 hasConcept C111335779 @default.
- W257729863 hasConcept C121332964 @default.
- W257729863 hasConcept C134306372 @default.
- W257729863 hasConcept C151201525 @default.
- W257729863 hasConcept C154945302 @default.
- W257729863 hasConcept C158622935 @default.
- W257729863 hasConcept C164380108 @default.
- W257729863 hasConcept C19118579 @default.
- W257729863 hasConcept C191544260 @default.
- W257729863 hasConcept C198394728 @default.
- W257729863 hasConcept C203479927 @default.
- W257729863 hasConcept C24890656 @default.
- W257729863 hasConcept C2524010 @default.
- W257729863 hasConcept C26546657 @default.
- W257729863 hasConcept C2775924081 @default.
- W257729863 hasConcept C33923547 @default.
- W257729863 hasConcept C40636538 @default.
- W257729863 hasConcept C41008148 @default.
- W257729863 hasConcept C47446073 @default.
- W257729863 hasConcept C62520636 @default.
- W257729863 hasConcept C6557445 @default.
- W257729863 hasConcept C86803240 @default.
- W257729863 hasConcept C93357160 @default.
- W257729863 hasConceptScore W257729863C110601934 @default.
- W257729863 hasConceptScore W257729863C111335779 @default.
- W257729863 hasConceptScore W257729863C121332964 @default.
- W257729863 hasConceptScore W257729863C134306372 @default.
- W257729863 hasConceptScore W257729863C151201525 @default.
- W257729863 hasConceptScore W257729863C154945302 @default.
- W257729863 hasConceptScore W257729863C158622935 @default.
- W257729863 hasConceptScore W257729863C164380108 @default.
- W257729863 hasConceptScore W257729863C19118579 @default.
- W257729863 hasConceptScore W257729863C191544260 @default.
- W257729863 hasConceptScore W257729863C198394728 @default.
- W257729863 hasConceptScore W257729863C203479927 @default.
- W257729863 hasConceptScore W257729863C24890656 @default.
- W257729863 hasConceptScore W257729863C2524010 @default.
- W257729863 hasConceptScore W257729863C26546657 @default.
- W257729863 hasConceptScore W257729863C2775924081 @default.
- W257729863 hasConceptScore W257729863C33923547 @default.
- W257729863 hasConceptScore W257729863C40636538 @default.
- W257729863 hasConceptScore W257729863C41008148 @default.
- W257729863 hasConceptScore W257729863C47446073 @default.
- W257729863 hasConceptScore W257729863C62520636 @default.
- W257729863 hasConceptScore W257729863C6557445 @default.
- W257729863 hasConceptScore W257729863C86803240 @default.
- W257729863 hasConceptScore W257729863C93357160 @default.
- W257729863 hasLocation W2577298631 @default.
- W257729863 hasOpenAccess W257729863 @default.
- W257729863 hasPrimaryLocation W2577298631 @default.
- W257729863 hasRelatedWork W2028281528 @default.
- W257729863 hasRelatedWork W2033951800 @default.
- W257729863 hasRelatedWork W2127202659 @default.
- W257729863 hasRelatedWork W2490472512 @default.
- W257729863 hasRelatedWork W2502858040 @default.
- W257729863 hasRelatedWork W2801529867 @default.
- W257729863 hasRelatedWork W2890296234 @default.
- W257729863 hasRelatedWork W2902249849 @default.
- W257729863 hasRelatedWork W2924857966 @default.
- W257729863 hasRelatedWork W2958431650 @default.
- W257729863 hasRelatedWork W2965232717 @default.
- W257729863 hasRelatedWork W2997162787 @default.
- W257729863 hasRelatedWork W3019706675 @default.
- W257729863 hasRelatedWork W3036722867 @default.
- W257729863 hasRelatedWork W3082762477 @default.
- W257729863 hasRelatedWork W3107723709 @default.
- W257729863 hasRelatedWork W3161982125 @default.
- W257729863 hasRelatedWork W3199713781 @default.
- W257729863 hasRelatedWork W3202520262 @default.
- W257729863 hasRelatedWork W758396656 @default.
- W257729863 isParatext "false" @default.
- W257729863 isRetracted "false" @default.
- W257729863 magId "257729863" @default.
- W257729863 workType "article" @default.