CN100376881C

CN100376881C - Multiple shaft multiple rotor dynamic balancing test method

Info

Publication number: CN100376881C
Application number: CNB2004100604385A
Authority: CN
Inventors: 李济顺; 马伟; 郑国强; 贾现召; 段明德; 李航
Original assignee: Henan University of Science and Technology
Current assignee: Henan University of Science and Technology
Priority date: 2004-08-03
Filing date: 2004-08-03
Publication date: 2008-03-26
Anticipated expiration: 2024-08-03
Also published as: CN1587944A

Abstract

The present invention relates to a testing method capable of carrying out multiple-shafting and multiple-rotor dynamic balance. The method comprises the steps that in the first step, before assembly, a dynamical balance test is carried out to the rotors one by one so that the balance error of the rotors is within a standard prescribed range; in the second step, all the rotors are assembled to proper positions; in the third step, one rotor is optionally selected as measuring reference so that the complete machine rotates according to working conditions, the imbalance signals of P vibration periods (P is the least common multiple or the integer multiple of the vibration periods of all the rotors of the system) of a system are extracted, and the reference rotor is dynamically balanced; in the fourth step, one rotor is selected from the leftover rotors and used as measuring reference so that the complete machine rotates according to the working conditions, the imbalance signals of P vibration periods (P is the smallest common multiple or the integer multiple of the vibration period of all the rotors of the system) of the system are extracted, and the reference rotor is dynamically balanced; in the fifth step, the fourth step is repeated until all the rotors are dynamically balanced, and thus, the testing of the complete machine is completed.

Description

Multi-shaft and multi-rotor dynamic balance test method

Technical Field

The invention relates to a dynamic balance test method, in particular to a test method capable of performing multi-axis and multi-rotor dynamic balance.

Background

With the development of modern machine products in the direction of high speed and high precision, the requirements on the dynamic balance quality of the machine products are continuously improved. For many machines, not only is there a need for precision balancing of components during the manufacturing process, but there is also a need for on-site monitoring of production operating conditions and on-site dynamic balancing of the machine. The dynamic balance technology has developed a plurality of mature technologies and methods from the birth date to the present. However, these techniques and methods are all applied to a single shaft and a single rotational speed. The dynamic balance of the multi-shaft and multi-rotating-speed equipment by adopting the prior art and the method is labor-consuming and time-consuming, and a satisfactory result cannot be obtained.

Disclosure of Invention

The invention provides a multi-shaft and multi-rotor dynamic balance test method for solving the dynamic balance problem of multi-shaft and multi-rotor, which aims to solve the dynamic balance problem of multi-shaft and multi-rotor and improve the dynamic balance test precision of multi-shaft and multi-rotor.

The technical scheme adopted by the invention for solving the technical problems is as follows: a multi-shaft and multi-rotor dynamic balance test method comprises the following steps:

(1) Before assembly, the rotors are subjected to a dynamic balance test one by one, so that the balance error of the rotors reaches the range within the standard specification;

(2) Assembling each rotor in place;

(3) Selecting one of the rotors as a measuring reference to enable the whole machine to rotate according to working conditions, extracting unbalanced signals of P vibration periods of the system (P is the least common multiple or integer multiple of the vibration periods of all the rotors of the system), and carrying out dynamic balance on the reference rotor;

(4) Selecting one rotor from the other rotors as a measuring reference to enable the whole machine to rotate according to working conditions, extracting unbalanced signals of P vibration periods of the system (P is the least common multiple or integral multiple of the vibration periods of all the rotors of the system), and carrying out dynamic balance on the reference rotor;

(5) And (5) repeating the step (4) until all the rotors are balanced, and finishing the complete machine test.

The dynamic balance is to eliminate the unbalance value by increasing or decreasing the balance weight.

The rotors rotate at different angular velocities, respectively. Suppose the angular velocity of the rotor 1 is ω ₁ Amplitude of A ₁ Initial phase is phi ₁ With a period of vibration T ₁ (ii) a Angular velocity of rotor 2 is ω ₂ Amplitude of A ₂ Initial phase is phi ₂ With a period of oscillation T ₂ (ii) a Angular velocity of rotor m is ω _m Amplitude of A _m Initial phase is phi _m With a period of vibration T _m (ii) a p is T ₁ 、T ₂ 、…、T _m The least common multiple of; then n at the rotor 1 ₁₁ Within one vibration period, n ₁₁ ＝p/T ₁ ； n ₂₁ ＝p/T ₂ ；...；n _k1 ＝p/T _k ，n _m1 ＝p/T _m ；

Assuming that the kth rotor is dynamically balanced, taking the rotor k as a measuring reference, the method comprises the following steps

A rotor k:

ak1, ak2, 8230and Aknk are the amplitudes of the rotor 1, the rotor 2, the rotor 8230and the rotor k respectively when the rotor k is taken as a measuring reference; phi is a _k1 、φ _k2 、…φ _knk The rotor k is used as a measuring reference, and the rotor 1, the rotor 2, \ 8230and the initial phase of the rotor k are respectively.

For the rotor j, the rotor j is,

j≠k

j =1,2, \8230;, k-1,k +1, \8230;, m, has

Then

…j =1,2, \ 8230;, k-1,k, k +1, \ 8230;, m, then

Thereby realizing the extraction of the rotor k unbalanced signal.

Therefore, the rotor 1, the rotor 2, the rotor 8230and the rotor m can be in turn in dynamic balance, and finally the dynamic balance of the whole machine is achieved.

The method of the invention utilizes the traditional dynamic balance technology in each step, but adopts the original collective average technology of leading out the average segment number according to the common multiple to realize the one-by-one balance of the multiple rotors and finally realize the dynamic balance of the whole machine. The multi-shaft multi-rotor dynamic balance machine is used for multi-shaft multi-rotation speed dynamic balance, not only has high balance precision, but also is practical, reliable and convenient, solves the problem that the existing balance machine cannot carry out multi-rotor on-site dynamic balance under different rotation speeds, opens up a brand-new way for multi-shaft multi-rotor dynamic balance tests, and has high technical value and practical value.

Drawings

FIG. 1 is a schematic view of a dual rotor system of the present invention, such as a mining centrifuge;

fig. 2 is a vector diagram of the dual rotor system of fig. 1.

In the figure, the number 1 is rotor 1, the number 2 is rotor 2, when it works, the two rotors are respectively in omega ₁ 、 ω ₂ Rotation, omega ₁ ＝2rad/s，ω ₂ =2.5rad/s, amplitude of rotor 1 being A ₁ Initial phase is phi ₁ With a period of vibration of

Amplitude of rotor 2 is A ₂ Initial phase is phi ₂ With a period of vibration of

Detailed Description

For the dual rotor system shown in fig. 1, before assembly, the rotor 1 and the rotor 2 are respectively subjected to a dynamic balance test so that the balance error is within the range specified by the relevant standard. After the assembly of the components is completed,

the vibration vector of the rotor 1 is A ₁₁ ＝A ₁₁ e ^φ11

The vibration vector of the rotor 2 is A ₂₁ ＝A ₂₁ e ^φ21

Using rotor 1 as measuring reference, making rotor 1 and rotor 2 simultaneously rotate, extracting unbalance signal of whole centrifuge, when period p =5, for centrifuge

Due to the fact that

A ₁₁ e ^φ11 I.e. the unbalance amount of the rotor 1, is eliminated by increasing or decreasing the balance weight.

Using rotor 2 as measuring reference, making rotor 1 and rotor 2 simultaneously rotate, extracting unbalance signal of whole centrifuge, when period p =4, for centrifuge

Due to the fact that

A ₂₁ e ^φ21 I.e. the unbalance amount of the rotor 1, is eliminated by increasing or decreasing the balance weight.

Therefore, the dynamic balance of the whole centrifuge is finished.

The above two multi-rotor and multi-shaft systems can be analogized in sequence according to the above examples, and the details are not described herein, but still should belong to the technical solution of the present invention and the protection scope of the present invention.

Claims

1. A multi-shaft and multi-rotor dynamic balance test method is characterized by comprising the following steps:

(2) Assembling each rotor in place;

(3) Selecting one of the rotors as a measuring reference to enable the whole machine to rotate according to working conditions, extracting unbalanced signals of P vibration periods of the system, wherein P is the least common multiple or integral multiple of the vibration periods of all the rotors of the system, and carrying out dynamic balance on the reference rotor;

(4) Selecting one rotor from the other rotors as a measuring reference to enable the whole machine to rotate according to the working condition, extracting unbalanced signals of P vibration periods of the system, wherein P is the minimum common multiple or integral multiple of the vibration periods of all the rotors of the system, and carrying out dynamic balance on the reference rotor;

(5) And (5) repeating the step (4) until all the rotors are in dynamic balance, and finishing the complete machine test.

2. The dynamic balance test method of claim 1, wherein the dynamic balance is to eliminate the unbalance value by increasing or decreasing the balance weight.