CN103306302A - Shafting load preadjusting method of metered spring base - Google Patents

Abstract

The invention relates to a shafting load preadjusting method of a metered spring base. The method sequentially comprises the following steps of (1) collecting the elevation hi of a rigid base bearing and a spring with the rigid Ki of a spring base corresponding to the bearing; (2) obtaining a relation between a bearing load and the elevation hi at a constant speed under the rigid base by adopting a transfer matrix method; (3) obtaining the stroke of the spring; (4) solving a reynolds equation by adopting a finite element method so as to obtain the floating amount of a shaft neck under a bearing load condition; (5) obtaining the elevation of the bearing; (6) replacing hi by use of the elevation of the bearing according to the f(hi) obtained in the step (2) so as to obtain an iterated bearing load; (7) returning to the steps (3)-(7) in due time; (8) obtaining the real load and practical elevation of the bearing at a constant speed under the spring base; and (9) obtaining the preadjusting amount delta of the elevation of the bearing. The method provided by the invention can be used for effectively improving the stability of the bearing and reducing the low-frequency vibration of the bearing and is wide in application prospect.

Description

A kind of axle that counts spring foundation is the load pre-adaptation method

Technical field

The present invention relates to a kind of axle that counts spring foundation is the load pre-adaptation method, and particularly relating to a kind of fault diagnosis of Power Machinery Engineering power plant equipment and the axle that counts spring foundation of processing technology field is the load pre-adaptation method.

Background technology

Along with increase and the manufacturing development of electricity needs, the Turbo-generator Set single-machine capacity is increasing, the support post on conventional basis bear because of axle be that the dead load of the dynamic load that brings such as remaining mass unbalance and unit body is also increasing.Adopt the nuclear power Turbo-generator Set of saturated vapour acting, in order to export same power, it is through-flow and long-pending much larger than conventional power plant that the nuclear power Turbo-generator Set needs, and more increased the load of support post.If adopt conventional basis, will cause support post quite thick, make civil engineering cost increase, but the equipment arrangement space is dwindled; If the employing flexible foundation then can make monoblock basic platform and institute's installed device and bottom foundation framework break away from the power coupling, and then simplify ground basic stress situation, reduce basic column size, increase installation space, and save the high thick platform of cost.The spring vibration isolation device that damper is installed simultaneously can also be decayed because of the high amplitude of crossing that produces in earthquake and the unit running process, and protection equipment does not suffer damage.Therefore, Turbo-generator Set adapted spring foundation becomes a kind of development trend gradually, and a lot of countries are also adopting the spring vibration isolation basis as the preferred option in the international generating set tender standard manual.

Along with the construction of introducing unit, China successively also uses spring foundation at gulf, field nuclear power station 2 * 1060MW, mountain range Australia nuclear power station 2 * 1000MW, Dabie Mountain, Huang gang power plant 2 * 600MW, duck river mouth, the Henan 2 * 350MW of power plant, more than 40 units such as the 2 * 350MW of Hefei two power plant, the 2 * 200MW of Beijing No.1 Heat and Power Plant, in addition also sunshine power plant, Taishan Electric Power Plant, decide also to have used spring foundation on the steam feed pump of power plant such as continent power plant, three phases of Waigaoqiao Bonded Zone, power plant, state Huaning sea, this has all shown the popularization of present spring foundation.Yet up to now, China relatively lags behind to the research of spring foundation, and its technology is grasped neither be very ripe, does not still have special design, installation and operating specification at the Turbo-generator Set spring foundation.

The greatest problem that Turbo-generator Set adapted spring unit brings supports the dynamic stiffness variation of (comprising rigidity and damping etc.) exactly, the shaft system of unit dynamic analysis that is the conventional concrete basis can be done rigid treatment to the basis, and the shaft system of unit dynamic analysis of adapted spring foundation then must be considered the influence of soil rigidity and damping.Therefore, probing into the axle that counts spring foundation is the load pre-adaptation method, installs with the shaft system of unit that instructs the adapted spring foundation, just has important theoretical meaning and more practical value.

Summary of the invention

It is the load pre-adaptation method that the technical problem to be solved in the present invention provides a kind of axle that counts spring foundation that improves bearing stability.

For solving the problems of the technologies described above, a kind of axle that counts spring foundation of the present invention is the load pre-adaptation method, may further comprise the steps successively:

(1) gather rigid foundation bearing absolute altitude h, and the stiffness K on bearing corresponding spring basis _{The i spring}, i=1,2 ... I, I is the number of middle (center) bearing for axle;

(2) adopt transfer matrix method, obtain under the rigid foundation constant speed operating mode lower bearing load With absolute altitude h _iBetween relation;

$W_i^{\left(1\right)}=f\left(h_i\right);$

(3) obtain the stroke of spring

(4) adopt Finite Element, by finding the solution Reynolds equation, obtain bearing load Under the operating mode, the floatation volume of axle journal

(5) obtain the bearing absolute altitude

$y_i^{\left(1\right)}=h_i+c_i^{\left(1\right)}+q_i^{\left(1\right)};$

(6) according to f (h in the step (2) _i), use the bearing absolute altitude

Substitute h _i, obtain the bearing load of iteration

$W_i^{\left(2\right)}=f\left(y_i^{\left(1\right)}\right);$

(7) when Order

Return step (3) to (7);

(8) when

Obtain under the spring foundation real load of constant speed operating mode lower bearing

And actual elevation

$W_i^{*}=W_i^{\left(2\right)}$

$y_i^{*}=y_i^{\left(1\right)};$

(9) obtain the pre-adjustment amount Δ of bearing absolute altitude;

$\mathrm{\Δ}=y_i^{*}-h_i.$

Install under the operating mode than static state, the influence that Turbo-generator Set is floated by basic telescopic spring and axle journal, its axle under operation condition is that the absolute altitude situation will take place than obvious variation, and then causes that axle is redistributing of load.How to predict that this variable quantity just becomes particularly important to realize a pre-adjustment that is load.Adopt the inventive method can effectively improve bearing stability, reduce the bearing low frequency vibration, be with a wide range of applications.

Description of drawings

Fig. 1 is horizontal low frequency vibration figure before No. 11 bearings of No. 1 unit of gulf, field nuclear power station are optimized.

Fig. 2 is vertical low frequency vibration figure before No. 11 bearings of No. 1 unit of gulf, field nuclear power station are optimized.

Fig. 3 is horizontal low frequency vibration figure after No. 11 bearing optimization of No. 1 unit of gulf, field nuclear power station.

Fig. 4 is vertical low frequency vibration figure after No. 11 bearing optimization of No. 1 unit of gulf, field nuclear power station.

The specific embodiment

The present invention is further detailed explanation below in conjunction with drawings and Examples.

The present invention may further comprise the steps successively:

(1) gathers rigid foundation bearing absolute altitude h _i, and the stiffness K on bearing corresponding spring basis _{The i spring}, i=1,2 ... I, I is the number of middle (center) bearing for axle;

(2) adopt transfer matrix method, obtain under the rigid foundation constant speed operating mode lower bearing load

With absolute altitude h _iBetween relation;

$W_i^{\left(1\right)}=f\left(h_i\right);$

(3) obtain the stroke of spring

(4) adopt Finite Element, by finding the solution Reynolds equation, obtain bearing load

Under the operating mode, the floatation volume of axle journal

(5) obtain the bearing absolute altitude

$y_i^{\left(1\right)}=h_i+c_i^{\left(1\right)}+q_i^{\left(1\right)};$

(6) according to f (h in the step (2) _i), use the bearing absolute altitude

Substitute h _i, obtain the bearing load of iteration

$W_i^{\left(2\right)}=f\left(y_i^{\left(1\right)}\right);$

(7) when

Order Return step (3) to (7);

(8) when

Obtain under the spring foundation real load of constant speed operating mode lower bearing

And actual elevation

$W_i^{*}=W_i^{\left(2\right)}$

$y_i^{*}=y_i^{\left(1\right)};$

(9) obtain the pre-adjustment amount Δ of bearing absolute altitude;

$\mathrm{\Δ}=y_i^{*}-h_i.$

Utilize the present invention in the T103 of No. 1 unit of gulf, field nuclear power station maintenance, 13 spring bearings are advanced theoretical analysis and calculation, thinking needs to break through the relevant installation code that manufactory provides, and in the T103 overhaul, No. 10, No. 11 bearing absolute altitudes are adjusted, that is: (1) No. 10 bearing absolute altitude reduces 0.1mm; (2) according to the bearing absolute altitude, the shaft coupling deviation between No. 10 and No. 11 bearings is adjusted into 0.255mm.The maintenance back starts to be found: this is to have adjusted this unit not enough problem of No. 11 bearing stabilities with regard to exist always since putting into operation that solved.This bearing low frequency vibration tendency chart of field measurement is seen Fig. 1 to figure four.The present invention is worth similar engineering to be used for reference, and is with a wide range of applications.

Claims (1)

1. an axle that counts spring foundation is the load pre-adaptation method, may further comprise the steps successively:

(1) gathers rigid foundation bearing absolute altitude h _i, and the stiffness K on bearing corresponding spring basis _{The i spring}, i=1,2 ... I, I is the number of middle (center) bearing for axle;

(2) adopt transfer matrix method, obtain under the rigid foundation constant speed operating mode lower bearing load

With absolute altitude h _iBetween relation;

$W_i^{\left(1\right)}=f\left(h_i\right);$

(3) obtain the stroke of spring

(4) adopt Finite Element, by finding the solution Reynolds equation, obtain bearing load Under the operating mode, the floatation volume of axle journal

(5) obtain the bearing absolute altitude

$y_i^{\left(1\right)}=h_i+c_i^{\left(1\right)}+q_i^{\left(1\right)};$

(6) according to f (h in the step (2) _i), use the bearing absolute altitude

Substitute h _i, obtain the bearing load of iteration

$W_i^{\left(2\right)}=f\left(y_i^{\left(1\right)}\right);$

(7) when

Order

Return step (3) to (7);

(8) when

Obtain under the spring foundation real load of constant speed operating mode lower bearing

And actual elevation

$W_i^{*}=W_i^{\left(2\right)}$

$y_i^{*}=y_i^{\left(1\right)};$

(9) obtain the pre-adjustment amount Δ of bearing absolute altitude;

$\mathrm{\Δ}=y_i^{*}-h_i.$

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