A NEW VIBRATION

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A NEW VIBRATION CANCELLATION MECHANISM AND
CONTROL UCONN Prof. Nejat OLGAC Oldrich
MIKUS Rifat
SIPAHI SIKORSKY Bill Welsh
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Introduction
The rotor creates undesired harmonic force
Aamplitude of the force
f frequency of the force
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Desired operating parameters

• a) Amplitude 0-1000 lbs.
• b) Frequency 16.2-18.2 Hz
• c) Phase 0 to 180?
• d) Transition within 1 sec.
• e) Maximum Force / Weight gt 40
• f) Total Harmonic Distortion (THD) lt -30 dB.

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Mission
1. Design - Light weight and compact
2. Control

• Fast transition.

• Steady state stabilization of the phase and
  frequency.

• Stable and robust.

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Novel design
Idea of counter rotating masses producing
variable amplitude of the force in vertical
direction.
Zero amplitude
Maximum amplitude
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Design
Control
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Control - Transition regime
Optimized trajectory planning
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Control - Steady state (phase lock)
Discrete P control
uu(Tn), n1,2,3,4
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Obstacles
1. Gravity effect on the angular speed of masses
2. Backlash of the gear pairs
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Control architecture
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Current research
1. Further improvement of mechanical design
2. Robust control algorithm