Theoretical Research On Transient Balancing Of Rotors With One Dash

The flexible rotors are always required to operate at a stable speed during the rotors' dynamic balancing. But in fact, it is difficult for a rotor to steadily and nicely rote at a certain speed. People have been expecting to identify the unbalance quickly and exactly with the information obtained from the rotors operating at unstable speed. However, there are no efficient and applicable methods available up till now.The paper is designed to do some preliminary theoretical research on transient balancing based on the previous achievements and seek one kind of methods of transient balancing. In the paper the primary balance theories and basic concepts are firstly presented, then the differential equation of flexible rotor operating steadily is derived and the characteristics of the equation's solution are analysed. The differential equation of flexible rotor operating unsteadily is also derived and solved, its transient dynamics responses under different accelerations are obtained with simulink's program. The amplitude, phases and advancing angular velocity of response along with rotational speed and time under different accelerations are discussed. The responding conclusions have been reached. A method of transient balance has been initially established in the paper. If the system parameter is known, the unbalance can be acquired from the response without adding trial mass, the responses are obtained from the program which emulates the real responses, Correspondingly, the unbalance can be acquired by adding trial mass if the system parameter is unknown. The data which can well reflect the unbalance has been analysed. Simultaneously, the paper has elucidated the necessity of balancing at-site and provided some methods besides mainly investigating the methods of transient balancing.