TAILIEUCHUNG - On a programme for the balancing calculation of flexible rotors with the influence coefficient method

This paper presents the influence coefficient method of determining the locations of unbalances on a flexible rotor system and the correction weights. A computer software for calculating the at-the-site balancing of a flexible rotor systern was created using c++ language at the Hanoi University of Technology. This software can be used by balancing flexible rotors in Vietnam. | Vietnam Journal of Mechanics, NCST of Vietnam Vol. 22, 2000, No 4 (235 - 247) ON A PROGRAMME FOR THE BALANCING CALCULATION OF FLEXIBLE ROTORS WITH THE INFLUENCE COEFFICIENT METHOD NGUYEN VAN KHANG - TRAN VAN LUONG Hanoi University of Technology ABSTRACT. This paper presents the influence coefficient method of determining the locations of unbalances on a flexible rotor system and the correction weights. A computer software for calculating the at-the-site balancing of a flexible rotor was created using c++ language at the Hanoi University of Technology. This software can be used by balancing flexible rotors in Vietnam. 1. Introduction The well-known methods of the at-the-site balancing of flexible rotors (the method of three time starting the trial weights, the vector triangle, the sensitivity) were successfully used to balance separate flexible rotors at the site. However, the efficiency of these balancing methods depends a lot on the correctness of the analysis of the vibration modes of separate rotors. Nowadays, rotors are manufactured longer and longer, many rotors are connected with each other. After manufacture, rotors are separately balanced before leaving the production workshop, but by connecting many rotors together, the separate balance status disappears due to mutual interaction of the residual unbalance remaining in each rotor which causes changes in the vibration of the entire system. The methods of separate rotor balancing may reduce vibration of the balanced rotor, but may increase vibration in many points in the other rotors of the system. In order to work safely, the vibration rate in all points of the rotor system, in all regimes, must lie within the permitted standards. Therefore the entire system of rotors must be balanced. In this paper, the author present the influence coefficient method for balancing flexible rotors [1, 2, 3]. This method is dependent on the basic principle that the influence coefficient matrix is square. In .

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