Effect of Thickness on Asymmetric Extensional Damping Treatment using Viscoelastic Materials
M.Prasanth Kumar, B.Mamatha, Dr.V.V.S.Bhaskara Raju, Dr.N.Ramanaiah, D.Appa Rao "Effect of Thickness on Asymmetric Extensional Damping Treatment using Viscoelastic Materials", International Journal of Engineering Trends and Technology (IJETT), V50(5),292-295 August 2017. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Unwanted vibration effects produced in structures may be eliminated by using vibration suppression methods. The most common form of vibration suppression is to add viscoelastic damping treatment to structural elements. These treatments will be known as Extensional damping also known as free layer damping and constrained layer damping, which consist of sandwiched metal and viscoelastic layer combinations which help to reduce vibrations. A thin plate may be highly resonant and exhibit large vibration that cause fatigue and failure, or transmit vibration to other parts of the structure. Applying an elastic coating to the plate surface increases the damping of the beam and thereby significantly reduces the vibration and its transmission. In the present paper, different types of rubber damping layers such as Natural, Nitrile and Neoprene rubbers (of 60 shore A hardness) are used in the FLD treatment of metallic plate(AA 6063) to study the capability of reducing vibrations over a predefined frequency range of interest and also effect of thickness of damping layers.
 Ashish M. Dharme, Pravin P. Hujare, “Analysis of Performance of FLD and CLD Technique”, International Journal of Engineering Sciences & Research Technology, pp. 340-343, 2015, ISSN: 2277-9655.
 Rizwan Ul Haque Syed, Muhammad Iqbal Sabir, Prof. Jiang Wei, “Effect of Viscoelastic Material Thickness of Damping Treatment Behavior on Gearbox”. Research Journal of Applied Sciences, Engineering and Technology 4(17): 3130-3136, 2012 ISSN: 2040-7467.
 Nashif AD, Jones DIG, Henderson JP (1985), “Vibration Damping”. Wiley, New York.
 Fernando Cortés, María Jesús Elejabarrieta “Structural Vibration of Flexural Beams With Thick Unconstrained Layer Damping” International Journal of Solids and Structures, 45 (2008), pp. 5805– 5813 Article history: Rec eived 21 February 2008 Received in revised form 12 June 2008.
 P. Bangarubabu, K. Kishore Kumar and Y. Krishna, “Damping Effect of Viscoelastic Materials on Sandwich Beams”. International Conference on Trends in Industrial and Mechanical Engineering (ICTIME`2012) March 24-25, 2012, pp, 171-173.
 Pedro Jorge, Hugo Policarpo, Miguel Matos Neves, “Cork Compositi on Damping Layer to Reduce Vibrations”. 15th Internattional Conference on Experimental Mechanics (I CEM), pp. 1 – 9.
 M. Prasanth Kumar, K. Anivesh Reddy, Dr. V.V.S. Bhaskara Raju and Dr. N. Ramanaiah, Performance Study on Asymmetric FLD Using Rubber Coatings. International Journal of Mechanical Engineering and Technology, 7(6), 2016, pp. 547–554.
FLD, Frequency response function, Vibration amplitude.