PASSIVE CONTROL OF THE NATURAL FREQUENCY OF CANTILEVER BEAM USING THE SUPPORT SPRING STIFFNESS VARIATION METHOD
In designing mechanical systems, the natural frequency needs to be designed to be higher than the operating frequency to prevent resonance. One way to increase the natural frequency is through the installation of a support spring with optimum stiffness. In this study, a cantilever beam additional su...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/82790 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | In designing mechanical systems, the natural frequency needs to be designed to be higher than the operating frequency to prevent resonance. One way to increase the natural frequency is through the installation of a support spring with optimum stiffness. In this study, a cantilever beam additional support spring is designed to increase the natural frequency of the first vibration mode without causing vibration mode switching.
This research starts with a literature study on analytical optimization of cantilever beam support spring stiffness. Based on this study, a finite element model is created to simulate the vibration of a cantilever beam with an additional support spring. If the simulation is in accordance with the theory, then the research continues to the model development stage in the form of adding vibration sensor mass, so that the model matches the real conditions. The model is then validated with experimental data from FRF measurements.
The experimental results show that the optimum value of the support spring stiffness is 7.76 N/mm. If the stiffness is smaller than this value, the vibration amplitude at the beam end will be large. If the stiffness is larger than the optimum value, the vibration at the free end of the beam will be very small, but there will be a disadvantage in the form of the appearance of large vibrations at other points due to the vibration mode switching.
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