INVESTIGATING METHOD OF ROTATING SPEED-DEPENDENT OSCILLATION OF ROTARY MACHINE

摘要

PURPOSE:To obtain a more accurate test result by varying the rotating speed of a rotary machine stepwise while holding the load condition of the rotary machine constant, and calculating the attenuation ratio or permissible oscillation coefficient of the rotary machine from oscillation response data of every rotating speed. CONSTITUTION:While the load condition of the rotary machine is held constant, the rotating speed is increased to 1,000, 2,000, 3,000, and 4,000r.p.m. to perform stationary operation for a specific time at every rotating speed, and the oscillation frequency is varied gradually within a target range to measure oscillation response. Data on it are collected and analyzed to calculate the attenuation ratio xsi or permissible oscillation coefficient. Consequently, when the load condition is constant and the rotating speed is varied, the natural oscillation frequency, attenuation ratio, stability tolerance, and dangerous speed of the rotary machine are calculated and a more accurate test result is obtained.