1. SEMI-ACTIVE CONTROL OF HELICOPTER VIBRATION USING CONTROLLABLE STIFFNESS AND DAMPING DEVICES Open Access Author: Anusonti-Inthra, Phuriwat Title: SEMI-ACTIVE CONTROL OF HELICOPTER VIBRATION USING CONTROLLABLE STIFFNESS AND DAMPING DEVICES Graduate Program: Aerospace Engineering Keywords: controllable dampercontrollable stiffnesssemi-active controlhelicopter vibration reduction File: Download Final_draft.pdf Committee Members: Edward C Smith, Committee MemberGeorge A Lesieutre, Committee MemberFarhan Gandhi, Committee Chair/Co-ChairChristopher Rahn, Committee Member