Abstract
Majority of the activities of a human being is associated with vibrations of one or other form. Application of vibrations can be found from a simple example like listening to music to challenging ones like design of complex machines and structures. Design of any system will not be rugged if it does not consider vibrations and its effects. The energy dissipated per cycle can be understood as damping. Presence of damping in a structure is represented by damping factor or damping ratio. Fibre reinforced plastic composites are a class of materials made from matrix and reinforcement. Matrix can be a resin system and reinforcement is usually fabric made of glass, carbon or aramid. The vibrating mechanical system causes resonance resulting in failure of machine components. By knowing the natural frequency and changing it from the range of operating machine member, resonance phenomenon could be avoided. This work focuses on finding the damping ratio and natural frequency of s glass fibre reinforced polymer composites through harmonic & modal analysis both by experimental method and FEM analysis for bare plate, plate with rectangular cutouts and plate with circular hole. The reduction in natural frequency and increase in damping corresponds to a change in stiffness and damping of the system. These changes are attributed to freeness of the system and introduction of cutouts in the laminate.
Highlights
Man became interested in vibration when he created the musical instruments like drums, whistles and other musical instruments
The bare plate shows reduced natural frequency when the laminate is under clamped-fixed -clamped-fixed (CFCF) condition as compared to CCCC condition in 1st mode, which reveals that freeness in the system reduces the natural frequency of the system
It can be seen that there is a substantial increase in natural frequency of laminates with cutouts as compared to that of bare plate
Summary
Man became interested in vibration when he created the musical instruments like drums, whistles and other musical instruments. Philosophers and musicians came up with the understanding of sound and sounds, which were used in creation of various musical instruments and were passed from generation to generation [1]. The motion that repeats itself after an interval of time can be called oscillation or vibration. The swinging of a simple pendulum, motion of a tuning fork and the spring balance are typical examples of vibration. Many a human activities involve sound and vibration in one or the other form. The theory of vibration deals with the study of oscillatory motion of bodies and forces associated with them. The types of vibration are free, forced, damped and undammed
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