CN103257018A - Rigid rotor dynamic balance obtaining method - Google Patents

Abstract

The invention belongs to the technical field of rotor design, and provides a rigid rotor dynamic balance obtaining method. The method includes the following steps: (1) an entity model of a rotor part is divided into grids and decomposed into a limited number of unit entities, (2) quality characteristic data of each grid unit are extracted, (3) a dynamic unbalance value of a rotor is obtained, and (4) a dynamic balance result of the rigid rotor is obtained. The method effectively overcomes the defect that obtaining of rigid rotor dynamic balance is not accurate, dynamic balance obtained in the method plays a significant role in the rotor design, vibration of machines can be effectively reduced, so service life of the machines is prolonged, work efficiency is improved, and operation is safe.

Description

The dynamically balanced acquisition methods of rigid rotator

Technical field

The invention belongs to the rotor design field, particularly the dynamically balanced acquisition methods of a kind of rigid rotator.

Background technology

The inertial force of rotor unbalance dynamic quality or moment of inertia are to cause the vibrative one of the main reasons of rotating machinery.Eliminate or reduce the vibration of machine, at first the main method of Kao Lving is that rotor is carried out balance, makes the vibration limiting of machine in allowed limits.

Transient equilibrium is the important indicator in rotor design and the processing, it is the important parameter that determines the rotor oscillation size, often adopting on engineering at present divides chip technology to obtain rotor dynamic balancing, this technology can be similar to calculates the rotor unbalancing value, but because it can accurately not judge the exact value of the barycenter of each burst, so degree of accuracy is not high, directly influence serviceable life, work efficiency and the operator's of machine use safety.

Therefore, the rotor design field press for a kind of degree of accuracy higher, prolong machine serviceable life, the dynamically balanced acquisition methods of rigid rotator of high efficiency, operation safe.

Summary of the invention

The present invention provides a kind of rigid rotator fast and accurately dynamically balanced acquisition methods in order to solve the defective that existing rigid rotator transient equilibrium is obtained, and technical scheme is as follows:

The dynamically balanced acquisition methods of rigid rotator is characterized in that, comprises following steps:

Step 1: the solid model of rotor component is divided grid, resolve into limited unit entity;

Step 2: the quality characteristics data of extracting each grid cell;

Step 3: obtain the rotor unbalancing value;

The unbalancing value U on rigid rotator two sides _A, U _BBe respectively:

$\left\{\begin{array}{c}{U}_A=\sqrt{{\left(U_x^A\right)}^2+{\left(U_y^A\right)}^2}\\ U_B=\sqrt{{\left(U_x^B\right)}^2+{\left(U_y^B\right)}^2}\end{array}\right.$

Wherein,

The unbalancing value of representing A face x, y axle respectively,

The unbalancing value of representing B face x, y axle respectively;

$\{U_x^A=\mathrm{\Σ}{m}_i^A{r}_i\cos {\mathrm{\β}}_i$

$U_y^A=\mathrm{\Σ}{m}_i^A{r}_i\sin {\mathrm{\β}}_i$

$\left\{\begin{array}{c}{U}_x^B=\mathrm{\Σ}{m}_i^B{r}_i\cos {\mathrm{\β}}_i\\ U_y^B=\mathrm{\Σ}{m}_i^B{r}_i\sin {\mathrm{\β}}_i\end{array}\right.$

Wherein, m _iQuality, r for each unit _iBe the distance of each units centre of mass to axis, sin β _i, cos β _iRepresent that respectively each units centre of mass is to sine, the cosine value of x axle and y axle;

Step 4: the transient equilibrium result who obtains rigid rotator: the unbalancing value that gets access to and the unbalancing value allowable of rotor are compared, whether meet the requirements thereby judge rotor.

The invention has the beneficial effects as follows:

1. rotor is resolved into limited unit, each unit can be regarded a point as, and the accuracy of its mass property improves greatly, thereby the precision of the unbalancing value that calculates also improves greatly.

2. the present invention saves cost, shortens rotor and designs and develops the time, thereby improve the economic benefits of enterprise.

3. the dynamically balanced acquisition methods of rigid rotator of the present invention can effectively reduce machine vibration, thereby prolongs machine serviceable life, increases work efficiency, operation safe.

Description of drawings

Describe the present invention in detail below in conjunction with the drawings and specific embodiments:

Fig. 1 is the cell cube structural representation of rotor component of the present invention.

Fig. 2 is the process flow diagram of the dynamically balanced acquisition methods of rigid rotator of the present invention.

Fig. 3 is an example of quality characteristics data of the present invention.

Embodiment

In order to make technological means of the present invention, creation characteristic, to reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.

As shown in Figure 2, be the process flow diagram of the dynamically balanced acquisition methods of rigid rotator of the present invention.Concrete steps of the present invention are as follows:

Step 1: rotor is divided into grid cell, resolves into limited unit entity.Can use the HyPermesh software demarcation, also can divide with softwares such as ICEMCFD, GAMBIT, Truegrid, import the solid model of bent axle by software interface, deformity point and repairing part curved surface through how much cleaning importings, carry out grid then and divide, grid cell adopts the Solid20 unit.

Step 2: the quality characteristics data of extracting each grid cell.Extract with finite element analysis softwares such as ansys, UG, GAMBIT, Truegrid.

Described quality characteristics data mainly refers to: unit volume, barycenter X coordinate, barycenter Y coordinate, barycenter Z coordinate.

Fig. 3 is an example of quality characteristics data.

Step 3: utilize second to go on foot the quality characteristics data of extracting, obtain the rotor unbalancing value.

Because the rotating speed of the each several part of rotor is identical, then has by lever principle:

$\left\{\begin{array}{c}{m}_A{r}_A+m_B{r}_B=\mathrm{mr}\\ m_B{r}_{B}b=m_A{r}_{A}a\\ L=a+b\end{array}\right.$

Put in order:

$\left\{\begin{array}{c}{m}_A{r}_A=\mathrm{mrb}/L\\ m_B{r}_B=\mathrm{mra}/L\end{array}\right.$

Wherein: m is unbalance mass,, and A, B are the reference field of both sides, m _A, m _BBe the unbalance mass, that produces on A, the B face, r _A, r _BBe the amount of unbalance radius vector, L is the distance of rectifying plane.

The quality of each part is decomposed on two rectifying planes, through the vector summation, can be in the hope of the unbalancing value of two correcting planes:

$\left\{\begin{array}{c}{U}_x^A=\mathrm{\Σ}{m}_i^A{r}_i\cos {\mathrm{\β}}_i\\ U_y^A=\mathrm{\Σ}{m}_i^A{r}_i\sin {\mathrm{\β}}_i\end{array}\right.$

$\left\{\begin{array}{c}{U}_x^B=\mathrm{\Σ}{m}_i^B{r}_i\cos {\mathrm{\β}}_i\\ U_y^B=\mathrm{\Σ}{m}_i^B{r}_i\sin {\mathrm{\β}}_i\end{array}\right.$

Wherein: m _i, r _iRepresent that respectively the quality, barycenter of each unit are to the distance of axis, sin β _iRepresent each units centre of mass to the sine value of x axle, cos β _iRepresent each units centre of mass to the cosine value of y axle,

The unbalancing value of representing A face x, y axle respectively,

The unbalancing value of representing B face x, y axle respectively.

The unbalancing value U on A, B two sides _A, U _BBe respectively:

$\left\{\begin{array}{c}{U}_A=\sqrt{{\left(U_x^A\right)}^2+{\left(U_y^A\right)}^2}\\ U_B=\sqrt{{\left(U_x^B\right)}^2+{\left(U_y^B\right)}^2}\end{array}\right.$

Whether step 4: the transient equilibrium result who obtains rigid rotator: the unbalancing value that gets access to and the unbalancing value allowable of rotor are compared, meet the requirements thereby judge rotor, unbalancing value allowable has concrete regulation in ISO1940.

The unbalancing value that gets access to judges that rotor dynamic balancing is defective during more than or equal to the unbalancing value allowable of rotor.

The unbalancing value that gets access to judges that rotor dynamic balancing is qualified during less than the unbalancing value allowable of rotor.

Superior characteristics of the present invention are:

1. fast, accurately obtain high-precision rotor unbalancing value, for rotor designs and process the man analysis transient equilibrium.

2. the present invention saves cost, shortens rotor and designs and develops the time, thereby improve the economic benefits of enterprise.

3. the dynamically balanced acquisition methods of rigid rotator of the present invention can effectively reduce machine vibration, thereby prolongs machine serviceable life, increases work efficiency, operation safe.

More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims (1)

1. the dynamically balanced acquisition methods of rigid rotator is characterized in that, comprises following steps:

Step 1: the solid model of rotor component is divided grid, resolve into limited unit entity;

Step 2: the quality characteristics data of extracting each grid cell;

Step 3: obtain the rotor unbalancing value;

The unbalancing value U on rigid rotator two sides _A, U _BBe respectively:

$\left\{\begin{array}{c}{U}_A=\sqrt{{\left(U_x^A\right)}^2+{\left(U_y^A\right)}^2}\\ U_B=\sqrt{{\left(U_x^B\right)}^2+{\left(U_y^B\right)}^2}\end{array}\right.$

Wherein,

The unbalancing value of representing A face x, y axle respectively,

The unbalancing value of representing B face x, y axle respectively;

$\left\{\begin{array}{c}{U}_x^A=\mathrm{\Σ}{m}_i^A{r}_i\cos {\mathrm{\β}}_i\\ U_y^A=\mathrm{\Σ}{m}_i^A{r}_i\sin {\mathrm{\β}}_i\end{array}\right.$

$\left\{\begin{array}{c}{U}_x^B=\mathrm{\Σ}{m}_i^B{r}_i\cos {\mathrm{\β}}_i\\ U_y^B=\mathrm{\Σ}{m}_i^B{r}_i\sin {\mathrm{\β}}_i\end{array}\right.$

Wherein, m _iQuality, r for each unit _iBe the distance of each units centre of mass to axis, sin β _i, cos β _iRepresent that respectively each units centre of mass is to sine, the cosine value of x axle and y axle;

Step 4: the transient equilibrium result who obtains rigid rotator: the unbalancing value that gets access to and the unbalancing value allowable of rotor are compared, whether meet the requirements thereby judge rotor.

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