DESIGN, CONSTRUCTION AND TESTING OF AN ALIGNMENT SETUP

• Main Author: Saksono Brodjo Muhadi, Novi
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/41578
• Institution: Institut Teknologi Bandung

Couplings are used for transmitting power and rotational speed from driver shaft to driven shaft, where the position of both shafts are coaxial. The condition in which the axis of one shaft does coincide with other axis is called misalignment. Misalignment types can be parallel misalignment, angular misalignment or combination both of them. Coupling misalignment generates vibration, and continuous vibration will damage machine components. Misalignments are common problem which often occurred in industries. In this research, an alignment setup is designed to enable students to simulate parallel misalignment. The goal of this research is to show vibration characteristics due to parallel misalignment. There two types of coupling used in this research, those are flange coupling and Oldham coupling. The Oldham coupling is used since it can accomodate parallel misalignment very well. Static and dynamic analysis of the design are cunducted using MSC Nastran 4.5 software. The aim of this analysis is to obtain the first five natural frequencies and their mode shapes. The result are very importance since it gives information concerning direction and location of sensors to achieve the best result. The pricise shaft alignment at vertical direction is the primary condition which must be fulfilled when fabricating the alignment setup, so that some parts of the setup must be processed using vertical miller machine. The test consists of FRF test, spectral map and phase spectrum measurements. During spectral map and phase spectrum measurements there are three variations of parallel misalignment level in the horizontal direction. The tests conducted at two types of couplings show various results. The results of flange coupling shows signals of 1X rpm , 2X rpm and 3X rpm, in which the 1X rpm is dominant. The result oft Oldham coupling shows that vibration signals of 1X rpm , 2X rpm, 3X rpm and 4X rpm with dominant signal at 2X rpm and some at 4X rpm. The spectral map tests on flange coupling and Oldham coupling, show that increasing values of RMS spectra in accordance with increasing magnitude of misalignment level, in horizontal direction. The results also show that the RMS values are constant in vertical direction, while in axial direction the RMS values increase in accordance wit h the increasing misalignment level.