OVERHUNG ROTOR BALANCING PERFORMANCE TESTS AS A FUNCTION OF LENGTH OVERHUNG, TYPE OF UNBALANCE, AND ROTARY FREQUENCY

• Main Author: MANAF (NIM : 13107107); Pembimbing Utama : Dr. Ir. Zainal Abidin, AFRIZAL
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/14691
• Institution: Institut Teknologi Bandung

Rotating machinery with overhung rotors are very common used in industry. Balancing of overhung rotors often more difficult than balancing of centerhung rotors. Balancing of overhung rotors has never been studied in Dynamics Laboratory of PAU-ITB. This research aims to determine the relationship between balancing performance of overhung rotors as a function of the overhung length, types of unbalance, and the rotational frequency. To achieve this goal, testings were carried out using test bed available in the Dynamics Laboratory of PAU-ITB. The tests were carried out on three shafts with three difference lengths that are 270 mm, 330_mm, and 420 mm. For each shaft carried there are three types of unbalance that are static, couple, and dynamic unbalance. For each types of unbalance, balancing process was carried out using one plane and two planes. For all shafts, balancing was carried out at ratational frequencies below the natural frequency. However, for shafts with a length of 420 mm the balancing process was also carried out at rotational frequency above the first natural frequency. Based on the results of testing, couple unbalance is a type of unbalance which is the most difficult to balance compared with static and dynamic unbalance. On couple unbalance, balancing performance tends to decrease with increasing overhung length. In additional, for the same unbalance conditions, balancing under and above the natural frequency produces different performance.