Bunshu Nagai

Digital Control of Magnetic Bearing with Rotationally Synchronized Interruption

For the purpose of clean and high speed rotation, an actively controlled magnetic bearing has been developed. Recently, a digital control system has been used to get high performance by using the state variable feedback. However, the gyroscopic or inductive mutual effect of a rotating disc sometimes makes the high speed rotor unstable.

Experimental identification of some structural parameters.

It is not uncommon in structural analysis that Some parameters can not be derived theoretically. One of the recent technique for overcoming this problem is to test the structure experimentally and use this information to help estimating the parameters. To calculate all of the structural parameters, however, requires a lot experimental data and the computational time. This paper introduces an efficient method for identifying some of the structural parameters using a receptance reanalysis technique. A simple cantilever beam is simulated on an analog computer and tested to determine parameters related to the clamped end. The results obtained are discussed in detail.