Trial mass-free transient high-speed dynamic balance method based on acceleration response information of flexible rotor

Abstract

The invention provides a trial mass-free transient high-speed dynamic balance method based on acceleration response information of a flexible rotor, and the method comprises the following steps of firstly establishing a transient motion equation of the rotor system by a transfer matrix method, and obtaining transient motion response data by a Newmark integral method; calculating unbalance excitation force by using a method combining load identification and modal coordinate transformation; and calculating the amount of unbalance of the rotor by combining the characteristics of unbalance excitation force based on the auxiliary angle formula. The trial mass-free transient high-speed dynamic balance method provided by the invention, in combination with the practical operation characteristics of the engine rotor and without adding weight, can implement the balance of the rotor through mathematical methods just by obtaining the transient response data of the accelerating starting process ofthe rotor system, is high in calculation efficiency and balancing precision, is an accurate and efficient trial mass-free transient dynamic balance method, and can be applied to practical engineering.

Description

technical field [0001] The invention belongs to the technical field of rotor balancing, and in particular relates to a transient high-speed dynamic balancing method without test weight based on the acceleration response information of a flexible rotor. Background technique [0002] Identifying the unbalanced distribution of the rotor and strictly balancing the rotor is an important measure to reduce engine vibration and improve the safety, reliability and life of the engine. It runs through all aspects of aero-engine manufacturing, installation, use and maintenance, and occupies a very important position in the development of aero-engines. [0003] The balance of the rotor can be divided into steady state balance and transient balance according to whether the speed changes during balance. The steady-state balancing method balances the rotor by holding it steady at one or more rotational speeds. The transient balance method is a method to balance the rotor in the process of...

AI Technical Summary

Problems solved by technology

At the same time, the steady-state balance method includes measuring the initial vibration of the rotor, adding a balance test weight, measuring the vibration of the rotor after adding the test weight, etc., to determine the unbalance amount after multiple test runs. The balance period is long, the balance efficiency is low, and the balance accuracy is poor.

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