EXPERIMENTAL STUDY ON ACTIVE VIBRATION CONTROL ON CANTILEVER BEAM USING SHAPE MEMORY ALLOY(NiTiNOL) WITH ON/OFF CONTROL

Conceptual Model

In this experimental setup a NiTinol wire of 0.5mm diameter is stretched and it’s both ends are fixed at vertical column equidistant from the cantilever beam such that if passes through the later. NiTinol wire is to be stretched to make a strain 2% of its length by using cable adjusting screws in the vertical column. The Shaker is fixed in a free end of a cantilever beam which acts as a vibrating source and vibration sensors(accelerometer) attached the in the cantilever beam which senses the vibration and generate respective electrical signal which are fed to CPU through PCI6201 DAQ. By analysisng the signal the natural frequency and modes can be determined.

By supplying required current, the temperature of NiTinol wire is increased uniformly to induced martensite phase transformation. Due to the phase transformation, NiTinol wire generates retaining force to regain back its initial position. When the retaining force acts on cantilever beam structure, stiffness of the cantilever beam structure increased. Hence the vibration of the cantilever can be controlled by supplying required current to Shape memory alloy wire.

Construction

  • Cantilever beam
  • Sensors
  • Thermocouple
  • Accelerometer

Specification

  • Cantilever beam (500 x 25 x 3) mm
  • Load cell – 10N
  • Shape Memory Alloy wire (0.5 mm)
  • Superelastic spring (0.5 mm)

expchanath

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