DEVELOPMENT OF SHAKER SYSTEM COMPENSATION TECHNIQUE FOR BOLT LOOSENESS TESTING
Self-loosening is a common occurrence when bolts and nuts are used as fasteners. This occurrence has the potential to disrupt the operation of control equipment and can even damage the equipment. During this testing, the level of vibration acceleration should be maintained for the entire frequency r...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/78225 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Self-loosening is a common occurrence when bolts and nuts are used as fasteners. This occurrence has the potential to disrupt the operation of control equipment and can even damage the equipment. During this testing, the level of vibration acceleration should be maintained for the entire frequency range of the test. The connection between the self-loosening phenomenon and the vibration frequency would be hard to determine if the acceleration amplitudes generated by the shaker system varies within the test frequency range, which start from 10 to 300 Hz. Consequently, a compensator is required to make the acceleration amplitude constant across the entire test frequency range.
Before designing the compensator, it is important to conduct dynamic identification to understand the dynamic characteristics of the system. In this research, frequency response testing is used for dynamic identification. The result of this testing is a graph which contained the relationship between the gain of the shaker system and frequency. Afterward, the equation of the system’s gain as a function of frequency can be determined through curve-fitting. Then, the compensator is constructed based on the inverse of this equation. Next, this compensator is applied to the shaker system. If the input vibration acceleration amplitude is the same as the output, the compensator is designed into digital version.
The digital compensator consists of a signal generator and a compensator both based on LabVIEW. Before constructing the digital compensator, a comparison is made between the output signal from the LabVIEW-based and the hardware signal generator. If both the frequency and the amplitude match, the digital compensator can be designed based on the previously established compensator equation. Afterward, the digital compensator is applied to the system, and frequency response testing is conducted again. If the output vibration acceleration amplitude matches with the input, the digital compensator then applied to self-loosening testing.
The results of the frequency response testing indicate that the compensated shaker system can produce a constant acceleration amplitude within the test frequency range. However, changes in test mass were not considered in the compensation technique developed in this research. |
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