Precise measurements of modal oscillations and vibrations
in the rotorcraft are necessary for understanding the
vibration modes. An innovative and inexpensive optical
imaging system has been designed for non-contact measurements
of all the components in-plane, components out-of-plane,
and torsional distortions. This system utilizes structured
light projected into the helicopter rotor blades. The
imaging system employs 3-D profile gauging techniques
and can provide real-time information. It thus maps amplitude,
phase, and temporal evolution of modal oscillations throughout
the complete helicopter blade. The measurements may be
performed while the helicopter is in flight. The system
can be accurate to 0.01 of an inch. During Phase I, we
have performed numerical simulation and laboratory experiments,
where the feasibility and the attainable precision have
been demonstrated. A prototype system is planned for Phase
II.
Innovations
