Professor of School of Engineering, Design and Built Environment, Western Sydney University, Australia. His research interests cover Industry 4.0, Additive Manufacturing, Advanced Engineering Materials and Structures (Metals and Composites), Multi-scale Modelling of Materials and Structures, Metal Forming and Metal Surface Treatment.
Abstract—Producing a noiseless and vibration free devices is a need of the day. The vibration causes rapid
wear of machine parts such as bearings and gears. Unwanted vibrations may cause loosening of
parts from the machine. Because of improper design or material distribution, the wheels of
locomotive can leave the track due to excessive vibration which results in accident or heavy loss.
Sometimes because of heavy vibrations proper readings of instrument cannot be taken. Vibration
can be used for useful purposes such as vibration testing equipment's, vibratory conveyors,
hoppers, and comparators. Vibration is found to be very fruitful in mechanical workshops such as
improving the efficiency of machining, casting, forging and welding techniques. The transfer of
noise can also be reduced by decoupling the components in such a way that the noise path is
interrupted. This can be achieved by adding noise reducing treatments to the structure such as
elastic elements, masses, local shielding or damping layers. In the present investigation, the use
of viscoelastic damping layers as a noise reducing measure in rotating machinery is considered.
Here in this investigation the result obtained will give frequency value in random manner and the
use of t-test (testing hypothesis) will show us that vibrations are really reduced or not.
Index Terms—Viscoelastic material, T-test, FFT analyser, Vibration reduction
Cite: Nikhil S Kulkarni and Eknath R Deore, "Experimental and T-Test (Testing Hypothesis) Approach in Vibration Reduction," International Journal of Mechanical Engineering and Robotics Research, Vol. 3, No. 3, pp. 611-618, July 2014.
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