Vibration analysis of electric grass trimmer using FEM
Abstract
HAV(Hand Arm Vibration)is a major problem in workers who operates hand held machine in day to day life, Hand arm vibration is form of vibration that is transmitted into your hands and arms, usually as a result of carrying out mechanized, hand-held work tasks. In this experiment the test RIG is manufactured to give comfort as well as help in reduction for Vibration, this rig also isolated by trimmer using MR elastomer and Foam and all readings are taken by FFT and validated by FEA.
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Introduction
The Indian Farmer while Working on Field he has to put all effort into field. The farmer always needed to reduce effort, while cutting grass on field there is Vibration. The important thing is that the vibration which is available in grass Trimmer/Cutter affects the Hand of operator who is operating; prolonged use of electric grass trimmer exposes the user to the risk of hand-arm vibration syndrome. A simple approach for the suppression of hand-arm vibration in electric grass trimmer is presented. The proposed system is a Modal analysis and operating deflection shape analysis of the electric grass trimmer were carried out and It is designed and fabricated for testing. The results in some previous experiment indicated that minimum vibration level was related to the position of the System on the shaft and reducing Hand Arm Vibration on electric grass trimmer. The result has to take from modal analysis and operating deflection shape which has to reveal that the presence of Vibrations has successfully reducing or not. The Vibration has to take in all Axis i.e. X,Y,Z. There are other way that reduce vibration by Isolating System from operator by means of Gloves or Providing Damping to the system.
Conclusion
From above table it is seen that the natural frequency in ansys and Harmonic frequency of FFT is matched in Long length, where these length get matched then at that point resonance is high therefore the long length is not suited for Garss trimmer in project with any isolator. The Short length eith MR Elastomer is most preferable than Foam and without isolator.