Browsing by Author "Tanappagol, P.S."

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    Experimental investigation for vibration attenuation for power tools
    (American Institute of Physics, 2025) Kamath, N.; Shenoy, P.; Tanappagol, P.S.; Rai, S.K.; Kalluvalappil, G.
    Construction zones are often buzzing with "chatter"emanating from different machines. The most commonly used machines are hand-held power tools that handle materials such as bricks, concrete, and other masonry-related materials. The labourers are exposed to vibrations from the device during operation for a prolonged period, causing lasting damage to the hand-arm system. Many factors lead to the unpredictable behaviour of the machine, making it difficult to manoeuvre. Increased gripping forces result in the hand-arm system being a better vibration medium. To counteract this effect, smart materials can stabilise the system. Magnetorheological Elastomers are one such material that can solve the problem of stabilising the device as they can adapt to different conditions, providing semi-active isolation for a wide range of frequencies and demonstrating its force-dependent behaviour. A handle made of MRE can be used to replace the conventional handle at the chuck region. This paper presents how the handle behaves in static conditions under the influence of different magnetic fields for an impact hammer test. © 2025 Author(s).
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    Tunable Vibration Control in Power Tool Handles Using a Magnetorheological Elastomer Device
    (Institute of Physics, 2025) Sathiyasai, S.; Kamath, N.; Shenoy, K.P.; Rai, S.K.; Tanappagol, P.S.; Rajesh; Gangadharan, G.
    A novel modular device integrating a magnetorheological elastomer (MRE) has been designed for adaptable attachment to various power tool auxiliary handles using their standard circular clamp and T-headed bolt mechanism. The core of the electromagnet of the device serves as the primary attachment interface. A relative validation approach was adopted to characterize its vibration control capabilities across different tool configurations. Instead of device-specific testing, the modular unit, loaded with supplementary masses of 1 kg and 1.5 kg to simulate various power tool weights, was mounted on a shaker and exposed to a defined vibration spectrum. The effect of varying the magnetic field strength on the dynamic behavior of the MRE-based isolator was examined. Experimental results reveal a notable positive shift in the system's natural frequency of approximately 3 Hz, transitioning from 12 Hz to 15 Hz when the maximum magnetic field was applied. Concurrently, the transmitted vibration amplitude was substantially reduced, averaging around 12%, under the same maximum field conditions. These findings highlight the potential of this modular MRE device as a versatile and easily integrable solution for tunable vibration damping in a wide array of power tools. Its semi-active nature offers a pathway to significantly enhance user comfort, reduce operator fatigue, and improve overall operational stability across diverse applications. © Published under licence by IOP Publishing Ltd.