Distributed actuator approach for active control of helicopter airframe vibrations

David E. Heverly, Edward C. Smith, K. W. Wang

Research output: Contribution to journalConference article

1 Scopus citations

Abstract

Active control of helicopter vibrations, with actuators in the airframe structure, is appealing in terms of simplicity, airworthiness, and effectiveness. The actuator locations of current active control systems are centrally located in the cabin or near the main rotor. A new approach to advance the state-of-the-art in helicopter active vibration control is proposed and explored in this research. The approach uses an optimization process to distribute a set of actuators throughout the airframe. A reduced order airframe dynamic model is utilized for the design methodology synthesis and system analysis. Actuator models are formulated and integrated with the airframe dynamic model. A novel optimization methodology is formulated to simultaneously determine optimal actuator placement and control actions. The optimization process couples an optimal control formulation with a non-gradient based optimization routine. An analytical study is performed comparing distributed actuator configurations to a representative state-of-the-art centralized actuator configuration. Actuation requirements are evaluated to aid the realization of an active airframe configuration. When compared to a representative state-of-the-art control configuration, a distributed actuator configuration achieves greater vibration reduction and requires less control effort. For example, one distributed actuator configuration produced an additional vibration reduction of 57% and a 15% control effort reduction.

Original languageEnglish (US)
Pages (from-to)2434-2448
Number of pages15
JournalCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Volume4
StatePublished - Jan 1 1999
EventProceedings of the 1999 AIAA/ASME/ASCE/AHS/ASC Structrures, Structural Dynamics, and Materials Conference and Exhibit - St. Louis, MO, USA
Duration: Apr 12 1999Apr 15 1999

All Science Journal Classification (ASJC) codes

  • Architecture
  • Materials Science(all)
  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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