CN105486400B - A kind of steam turbine generator stand hull vibration method of response calculation - Google Patents
A kind of steam turbine generator stand hull vibration method of response calculation Download PDFInfo
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- CN105486400B CN105486400B CN201510823657.2A CN201510823657A CN105486400B CN 105486400 B CN105486400 B CN 105486400B CN 201510823657 A CN201510823657 A CN 201510823657A CN 105486400 B CN105486400 B CN 105486400B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
Abstract
The present invention provides a kind of steam turbine generator stand hull vibration method of response calculation, by the shell side components of generator pit by weight and structural rigidity is equivalent to beam column part and concentrates mass combination；By engine base footing and coupling between bottom plate, carry distributed data by different operating mode lower support corner bottoms and simulate to obtain the flexible member of different joint stiffnesses；Steam turbine generator concrete foundation is equivalent to the three-dimensional space model based on a beam element, is collectively constituted with frame shell etc. as a sub- construction module；Generator pit housing and basic minor structure module are connected into coupling with generator amature system by bearing dynamic oil film stiffness and damping.It is of the invention completely to consider the influences of the factor to generator pit hull vibration frequency and response such as rotor entity structure and bearing dynamic oil film force, the supporting border change of generator pit floor load distribution and foundation structure vibration, the analysis model for more meeting actual motion state is provided for steam turbine generator stand hull vibration property calculation.
Description
Technical field
The present invention relates to one kind to simulate live operating status, that is, is included in generator amature entity structure and bearing dynamic oil film
Power, engine base bottom carry the steam turbine generator stand hull vibration response computation under the conditions of change and the influence of generator foundation structure etc.
Method, belongs to power station steam turbine generator technical field.
Background technology
To avoid steam turbine generator, operationally the vibration of its frame shell key position is excessive, brings cooling water and hydrogen etc.
The security incidents such as important pipeline is revealed, noise is exceeded, ensure unit normal operation, existing thermoelectricity or nuclear power are set with steam turbine generator
In meter, to carry out engine base intrinsic frequency, design exciting force under engine base Calculation of Vibration Response.But when design calculates, act on
The exciting force of bearing with end cover is a given unidirectional fixed sinusoidal force, and the supporting border of generator pit is generally equivalent to fixed branch
Support or single rigidity value.
The rotor entity structure that this computation model have ignored under operation rotation status influences and Oil-film Force dynamic becomes
Change and each generator pit corner load distribution is in engine base footing static different from operating on-load state and producing
Joint stiffness changes between bottom plate, and the structural vibration coupling effect of huge generator concrete foundation influences in addition, can not
It is included in so that there is notable difference under the intrinsic frequency and Calculation of Vibration Response value and actual motion state of generator pit housing,
Severe patient, band high load capacity working status generate frame shell mesomerism and the excessive phenomenon of vibratory response.Therefore, it is necessary to will fortune
Joint stiffness change and generator basis are brought into greatly between the rotor and bearing dynamic oil film force, engine base footing and bottom plate that turn
In type nuclear power generating sets generator pit hull vibration response computation model.
In addition, the border for simulating live actual installation operating condition is due to being included in by existing calculation model for design, therefore
Generator pit vibration characteristics can not accurately be carried out optimizes and revises analysis.
The content of the invention
The technical problem to be solved in the present invention is to provide one kind to simulate unit in-site installation operating status, can be included in rotor reality
Change joint stiffness and rotor and generator coagulation soil matrix between body structure and bearing dynamic oil film force, engine base footing and bottom plate
The steam turbine generator stand hull vibration method of response calculation that plinth structure influences.
In order to solve the above-mentioned technical problem, the technical scheme is that providing a kind of steam turbine generator stand hull vibration
Method of response calculation, it is characterised in that：This method is made of following 4 steps：
Step 1, by the shell side components of generator pit are equivalent by generator housing bars position be into multiple beambar elements
Main three-D space structure model, physical components of the flexible support on casing are added in corresponding node by Mass Distribution is equivalent
On, the hydrogen cooler at the top of housing both ends be equivalent to by weight with Stiffness Distribution it is square at the top of housing both ends connect on neck, by end
Lid bearing block is distributed by end cap gusset and lower box structural rigidity is equivalent to symmetrical supporting bar and lower half hound
Part group, the equivalent rod piece in bearing with end cover end face intersect with housing and generator foundation longitudinal beam；
Step 2, based on engine base corner bottom carry generator housing torque under measured data or design specification value and different load
Changing value, simulates static and different load operating mode lower support footing and the joint stiffness or prestressing force that are contacted between bottom plate, establishes four
Angle Di Zai distributed areas footing gusset to generator both sides bottom plate fulcrum Equivalent Elasticity connection unit or prestressing force boundary element；
Step 3, the concrete foundation of generator include exciter basis, and a beam list is equivalent to by its material object structure size
Three-dimensional space model based on member, generator both sides bottom plate are fixedly connected to form equivalent beam with basic top platen longeron；With step
1st, 2 model units established form 1 sub- construction module；
The discrete mass unit equivalent for multiple rigidity of the generator entity rotor of step 4 including excitation rotor, composition 1
A sub- construction module, each bearing of journals branch point coordinates of generator amature and the frame shell obtained in step 3 and basic minor structure
The bearing pivot position coordinates of module is consistent；Based on rotor Operation Conditions, bearing dynamic oil film rigidity, damping ginseng is calculated
Number, this bearing dynamic oil film parameter is as dynamic elasticity connector, by generator amature system and generator pit housing system
Module connects into Coupled Vibration System and carries out dynamic characteristic calculating analysis, to obtain rotor real-world operation operating mode and bearing dynamic oil film
The intrinsic frequency of generator pit housing and the vibratory response of key node under power effect.
Preferably, in the step 1, shell side components include casing, engine base footing piece, iron core, connecting spring, hydrogen-cooled device and
Bearing with end cover.
Preferably, the step 1 concretely comprises the following steps：
Step 1.1, the generator pit housing, space beam column is reticulated by housing gusset position equivalent dispersion,
Node and numbering, and being mixed at bearing rib footing with bottom plate and basis in order are established in axial gusset and circumferential gusset intersection
Close longeron and establish connection；
Step 1.2, engine base iron core and other appurtenances are separated into equivalent mass, pass through the branch being connected in housing with gusset
Support spring element is supported on housing node；
Step 1.3, hydrogen cooler case and cooler, discrete by bars position is rectangular space beam, its construction weight
Mass block is equivalent to aggravate in node；
Step 1.4, for end-cover axle bearing, according to the bearing pivot position of rotor journal, end-cover axle bearing is pressed into end cap
Gusset distribution is equivalent to symmetrical radial supporting bar, carrys out equivalent adjustment lower half according to end cap lower box structural rigidity
The cross section property of diagonal brace rod piece, the equivalent rod piece in bearing with end cover end face intersect with housing and generator foundation longitudinal beam.
Preferably, concretely comprising the following steps in the step 2：
Step 2.1, carry distribution measured result or design bottom load distribution code requirement according to generator in-site installation bottom, obtains
Generator pit bottom carries distributed data, while calculates generator housing moment variations under different load and produce the change that both sides bottom carries power
Change；
Step 2.2, carry distribution, the static and different load operating mode of simulation according to the engine base corner bottom under static and load condition
Joint stiffness between lower support footing and bottom plate, establishes its footing gusset of engine base corner Di Zai distributed areas to generator both sides bottom
The Equivalent Elasticity connection unit of plate fulcrum；
Step 2.3, generator both sides bottom plate are fixedly connected with concrete foundation top platen longeron, form superposition section.
Preferably, concretely comprising the following steps in the step 3：
Step 3.1, include in generator setting node, each two node structure on exciter concrete foundation crossbeam and column
Into a cellular construction, and for each node and cellular construction, corresponding unit number is set；
Step 3.2, generator both sides bottom plate and the basic affixed superposition section of top platen longeron set specialized node and unit；
Step 3.3, the material properties style number and cross section property style number for setting each unit structure.
Preferably, in the step 3.2, superposition section is metal and concrete mixing equivalent beam.
Preferably, in the step 4, " by generator amature minor structure and generator pit housing, end-cover axle bearing and base
Plinth minor structure is attached into Coupled Vibration System " it can be replaced " by generator pit housing system and generator amature system
Connect into Coupled Vibration System ".
Preferably, concretely comprising the following steps in the step 4：
The discrete mass unit equivalent for multiple rigidity of the generator entity rotor of step 4.1 including excitation rotor, calculates
The bearing film dynamic parameter under each Operation Conditions of rotor is obtained as dynamic elasticity connector；
Step 4.2, the amount of unbalance that entity rotor is calculated, are connector by generator using bearing dynamic oil film parameter
Rotor-support-foundation system and generator pit housing system module connect into Coupled Vibration System (or：By generator amature minor structure and hair
Electric machine stand housing, end-cover axle bearing and basic minor structure connect into Coupled Vibration System) dynamic characteristic calculating analysis is carried out, to obtain
Obtain rotor real-world operation operating mode and the intrinsic frequency and key node of the generator pit housing under the effect of bearing dynamic oil film force
Vibratory response.
Compared with prior art, the present invention has the advantages that：
(1) present invention more fully consider rotor entity structure under live operating status and bearing dynamic oil film force,
The factors such as the change of supporting border and foundation structure vibration of the distribution of generator pit floor load shake generator pit housing
Dynamic frequency and the influence of response, establish the steam turbine generator stand hull girder/bar unit calculating for being included in rotor bearing and basis
Model, utilizes System by Modal Synthesis Method, when can calculate analysis acquisition different rotating speeds, different load operating mode, generator operation state
Frame shell key point vibratory response value under the effect of rotor bearing oil-film force and under physical infrastructure support border, may be used also
Generator pit rank modal frequency each with basic total system and the vibration shape are obtained to calculate；Result of calculation is more in line with live operation
State.
(2) present invention extends the design of generator pit vibration characteristics and calculates analysis application range.The meter that the present invention establishes
Model is calculated to be sent out by varying the change of the equivalent beam column cross section property of casing, improvement of bearing structure and lubricant parameter
The optimization analysis of high-rating generator engine base vibration characteristics, in designing in order to control and power plant under rotor rotating operation state
In the Turbo-generator Set frame shell vibratory response amplitude of fortune, there is provided it is more rationally effective, more meet actual motion state,
Also can a variety of calculation of vibration results of synchronization gain computational methods.
(3) calculating analysis model and method proposed by the present invention can also synchronization gains：It is firm generator pit structure has been included in
Generator amature vibration modal frequency and the vibration shape under property effect, make bearing block and rotor oscillation property calculation result also more accurate
Really.
Brief description of the drawings
Fig. 1 is the steam turbine generator stand and rotor bearing and basic system schematic front view that the present embodiment uses；
Fig. 2 is the left view of Fig. 1；
Fig. 3 is steam turbine generator stand hull vibration method of response calculation flow diagram；
Fig. 4 is the Three-dimensional CAD schematic diagram of each component Equivalent Beam rod piece of generator pit；
Fig. 5 carries distributing position schematic diagram for generator pit bottom；
Fig. 6 is generator pit and basic Equivalent Beam (rod piece) Three-dimensional CAD system schematic；
Fig. 7 is rotor and bearing film system-computed model system schematic diagram；
Fig. 8 generator pit and basic system, Mode Shape figure of rotor-support-foundation system under unit operating condition.
Embodiment
With reference to specific embodiment, the present invention is further explained.It is to be understood that these embodiments are merely to illustrate the present invention
Rather than limit the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, people in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Scope.
Fig. 1 and Fig. 2 be respectively the steam turbine generator stand that the present embodiment uses and rotor bearing and basic system main view and
Left view schematic diagram, the steam turbine generator stand and rotor bearing and basic system are by engine base 1, rotor 2, bearing 3, engine base shell
Body 4, frame shell gusset 5, iron core 6, concrete foundation 7, end cap and lid formula bearing block 8, hydrogen cooler 9, footing 10, bottom plate
11 grades form.
Fig. 3 show steam turbine generator stand hull vibration method of response calculation flow diagram, and this method establishes meter
Enter the steam turbine generator stand hull vibration property calculation model after rotor bearing oil film dynamic force and concrete foundation, step is such as
Under：
Step 1：
The frame shell 4 of the nuclear power generating sets steam turbine generator supports tubular iron core 6, axial ribs 18 by 18 inner spring plates
Root, 18 gussets of circumferential stirrup, shell body and two longitudinal 8 groups of footing 10, both ends End winding end cap and lid formula bearing blocks
Into vapour encourages both sides case top and is provided with hydrogen cooler 9.Its material object is equivalent to based on a beambar elements plus lumped mass
Three-dimensional space model, is shown in Fig. 4, and specific implementation is as follows：
1. housing where axial ribs combine is equivalent to 18 different cross section size rod pieces, circumferential stirrup is equivalent to 18 rings
Shape strip rod piece, the footing gusset of corresponding circumferential direction stirrup are equivalent to triangle strut, axial rod and circumferential annular by rigidity quality
Element junction is set to node.Each two node forms a cellular construction, and serial number and is attached.
2. iron core and equivalent integrated 36 quality points of other appurtenances, both sides longitudinal direction is placed on by the equivalent rod piece of inner spring
On rod node.
3. generator's cover and bearing pedestal, by each gusset distribution and end cap plate body size where it thereon, and
By end-cover axle bearing rigidity is surveyed, radial supporting bar and lower half diagonal brace the rod piece group of the rigidity such as symmetrical is equivalent to,
And intersect with housing and generator foundation longitudinal beam.
4. generator housing both ends hydrogen cooler presses rigidity and quality, rectangular frame loading is equivalent on housing both ends
Portion.
Step 2：
Engine base corner bottom is installed according to generator and carries distribution situation, that establishes footing and bottom plate couples characteristic, sees Fig. 5, has
Body is implemented as follows：
Distributed data is carried 1. carrying distribution measured result according to generator in-site installation bottom and obtaining generator pit bottom, and is calculated
Obtain generator housing moment variations under on-load and produce the change result of calculation that both sides bottom carries power, be shown in Table 1.
It is fixedly connected 2. frame bottom plate is equivalent to two longitudinal beams with basis, the carrying of four angular zone of engine base footing, passes through bullet
Property unit be connected with bottom plate corner, result of calculation is distributed by corner load, corresponding connection is chosen by load and contact condition
Rigidity, obtains joint stiffness simulation distribution as a result, being shown in Table 1.
1 generator pit bottom of table carries corner distribution and adjusts result and resilient connection stiffness simulation result
Step 3：
The steam turbine generator includes the concrete foundation 7 of exciter, is made of top platen, middle platen and column, in fact
Thing structure size is equivalent to the three-dimensional space model based on a beam element, and with the one structure mould of synthesis such as generator pit housing
Block, is shown in Fig. 6, and A represents generator pit in Fig. 6, and B represents generator basis, and C represents exciter across specific implementation is as follows：
1. the node on concrete foundation beam and column is arranged at geometric characteristics and changes in material properties, Yi Jifa
At motor load distribution, each two node forms a unit and numbers in order.
2. generator basis is synthesized into a submodule one with frame shell, footing, end-cover axle bearing and hydrogen-cooled device.
3. the material type and cross-sectional shape of each cellular construction are set to submodule one, for generator both sides bottom plate with
Basic two side girder superposition sections, carry out equivalent elasticity modulus of materials and proportion property calculation, obtain material properties type 3 kind, section
55 kinds of face attribute type, number of nodes 310.
Step 4：
It is multimass, equivalent rigid outside diameter shaft part system that it is discrete that generator amature is included exciter rotor, forms submodule
Block two, forms 147 units and 148 nodes, generator rotor shaft neck branch point coordinates and the submodule described in step 3 altogether
One bearing pivot position coordinates is consistent, sees Fig. 7, and D represents generator amature in Fig. 7, and E represents bearing film stiffness and damping side
Boundary, F represent exciter rotor.Based on rotor Operation Conditions, bearing dynamic oil film rigidity, damping parameter, this oil film is calculated
Frame shell is connected into and coupled with basic system and the big minor structure module of rotor-support-foundation system two as dynamic elasticity connector by parameter
Vibrational system, the vibration frequency vibration shape and vibratory response meter of generator pit housing are carried out with Dynamic Substructure modal synthesis method
Calculate.
The effect of the present invention：
By above-mentioned steps establish cover rotor bearing oil-film force and engine base footing and bottom plate connecting rigidity dynamic boundary,
And beam/bar unit computation model of rotor and the steam turbine generator stand housing of concrete foundation structure influence, utilize dynamic
System by Modal Synthesis Method in subsctructure method, can analyze obtain rotor installation, generator operation when difference operating mode border under, Yi Jishi
Frame shell modal frequency, vibration shape key position and vibratory response value under body underlying structural support, can additionally calculate to obtain machine
Seat shell body and the generator amature critical speed and the vibration shape under basic system joint effect.The corresponding boundary condition of different operating modes
Under, the Calculation results such as generator pit housing system vibration modal frequency and key position response are shown in Table 2, generator pit
For the vibration shape of housing and basic system the result is shown in Fig. 8 A to Fig. 8 F, Fig. 8 A vibrate the vibration shape for casing horizontal axis, Fig. 8 B for casing with
The basis coupling anti-phase vibration vibration shape of horizontal axis, Fig. 8 C couple horizontal cross with basis for casing and vibrate the vibration shape, and Fig. 8 D are casing
The horizontal axis twisting vibration vibration shape, Fig. 8 E vertically vibrate the vibration shape for casing to single order, and Fig. 8 F are generator amature vertically to second order
Vibrate the vibration shape.
Generator pit housing system principal vibration property calculation analysis result under the corresponding boundary condition of the different operating modes of table 2
Claims (7)
- A kind of 1. steam turbine generator stand hull vibration method of response calculation, it is characterised in that：This method is by following 4 step groups Into：It is step 1, the shell side components of generator pit are equivalent into based on multiple beambar elements by generator housing bars position Three-D space structure model, physical components of the flexible support on casing are added on corresponding node by Mass Distribution is equivalent, shell Hydrogen cooler at the top of body both ends be equivalent to by weight with Stiffness Distribution it is square at the top of housing both ends connect on neck, by bearing with end cover Seat presses the distribution of end cap gusset and lower box structural rigidity, is equivalent to symmetrical radial supporting bar and lower half hound Part group, and intersect with housing and generator foundation longitudinal beam；Step 2, based on engine base corner bottom carry generator housing moment variations under measured data or design specification value and different load Value, simulates static and different load operating mode lower support footing and the joint stiffness contacted between bottom plate, establishes corner Di Zai distributed areas Domain footing gusset to generator both sides bottom plate fulcrum Equivalent Elasticity connection unit；Step 3, the concrete foundation of generator include exciter basis, and being equivalent to a beam element by its material object structure size is Main three-dimensional space model, generator both sides bottom plate are fixedly connected to form equivalent beam with basic top platen longeron；Built with steps 1 and 2 Vertical model unit forms 1 sub- construction module；The discrete mass unit equivalent for multiple rigidity of the generator entity rotor-support-foundation system of step 4 including excitation rotor, composition 1 A sub- construction module, each bearing of journals branch point coordinates of generator amature and the bearing pivot of the minor structure module obtained in step 3 Position coordinates is consistent, based on rotor Operation Conditions, bearing dynamic oil film rigidity, damping parameter is calculated, this bearing dynamic oil Film parameters are as dynamic elasticity connector, by generator amature minor structure and generator pit housing, end-cover axle bearing and basis Minor structure is attached into Coupled Vibration System and carries out dynamic characteristic calculating analysis, to obtain rotor real-world operation and bearing dynamic oil The intrinsic frequency of generator pit housing and the vibratory response of key node under membrane forces effect.
- A kind of 2. steam turbine generator stand hull vibration method of response calculation as claimed in claim 1, it is characterised in that：It is described Step 1 concretely comprises the following steps：Step 1.1, the generator pit housing, reticulate space beam column, in axis by housing gusset position equivalent dispersion Node and in order numbering are established to gusset and circumferential direction gusset intersection, and mixes and indulges with bottom plate and basis at bearing rib footing Beam establishes connection；Step 1.2, engine base iron core and its appurtenances are separated into equivalent mass, pass through the support spring being connected in housing with gusset Element is supported on housing node；Step 1.3, hydrogen cooler case and cooler, discrete by bars position is rectangular space beam, its construction weight is equivalent Aggravated for mass block in node；Step 1.4, for end-cover axle bearing, according to the bearing pivot position of rotor journal, end-cover axle bearing is pressed into end cap gusset Distribution is equivalent to symmetrical radial supporting bar, comes according to end cap lower box structural rigidity equivalent oblique to adjust lower half The cross section property of strut member, the equivalent rod piece in bearing with end cover end face intersect with housing and generator foundation longitudinal beam.
- A kind of 3. steam turbine generator stand hull vibration method of response calculation as claimed in claim 1, it is characterised in that：It is described Concretely comprising the following steps in step 2：Step 2.1, carry distribution measured result or design bottom load distribution code requirement according to generator in-site installation bottom, is generated electricity Machine engine base bottom carries distributed data, while calculates generator housing moment variations under different load and produce the change that both sides bottom carries power；Step 2.2, according under static and load condition engine base corner bottom carry distribution, simulate static and different load operating mode under machine Joint stiffness between seat footing and bottom plate, establishes its footing gusset of engine base corner Di Zai distributed areas to generator both sides bottom plate branch The Equivalent Elasticity connection unit of point；Step 2.3, generator both sides bottom plate are fixedly connected with concrete foundation top platen longeron, form superposition section.
- A kind of 4. steam turbine generator stand hull vibration method of response calculation as claimed in claim 1, it is characterised in that：It is described Concretely comprising the following steps in step 3：Step 3.1, include in generator setting node on exciter concrete foundation crossbeam and column, and each two node forms one A cellular construction, and corresponding unit number is set for each node and cellular construction；Step 3.2, generator both sides bottom plate and the basic affixed superposition section of top platen longeron set specialized node and unit；Step 3.3, the material properties style number and cross section property style number for setting each unit structure.
- A kind of 5. steam turbine generator stand hull vibration method of response calculation as claimed in claim 1, it is characterised in that：It is described In step 1, shell side components include casing, engine base footing piece, iron core, connecting spring, hydrogen-cooled device and bearing with end cover.
- A kind of 6. steam turbine generator stand hull vibration method of response calculation as claimed in claim 4, it is characterised in that：It is described In step 3.2, superposition section is metal and concrete mixing equivalent beam.
- A kind of 7. steam turbine generator stand hull vibration method of response calculation as claimed in claim 1, it is characterised in that：It is described In step 4, " generator amature minor structure and generator pit housing, end-cover axle bearing and basic minor structure are attached into Coupled Vibration System " can be replaced " connects into coupled vibrations system by generator pit housing system and generator amature system System ".
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| CN109632166A (en) * | 2018-12-21 | 2019-04-16 | 上海鑫易衡机械科技有限公司 | A kind of steam turbine generator stand footing load measurement Adjustment Tests method |
| CN111458007B (en) * | 2020-05-06 | 2021-09-24 | 哈尔滨电机厂有限责任公司 | Method for identifying local vibration of end part of steam turbine generator |
| CN112487578A (en) * | 2020-11-27 | 2021-03-12 | 上海电气电站设备有限公司 | Method for improving support rigidity of large-scale steam turbine generator and reducing vibration response |
| CN113742891A (en) * | 2021-08-04 | 2021-12-03 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Offline selection method and system for generator foot load distribution |
| CN113685239B (en) * | 2021-08-10 | 2024-01-02 | 国网河北能源技术服务有限公司 | High-position steam turbine device, fault analysis device and fault analysis method |
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| CN102175306B (en) * | 2011-01-24 | 2012-10-10 | 华北电力大学 | Method for identifying oil whipping fault of steam turbine generator unit in real-time |
| CN102175408B (en) * | 2011-02-01 | 2012-07-04 | 华北电力大学 | Method for identifying rigidness of bearing pedestal of steam turbine generator unit in real time |
| CN103234745B (en) * | 2013-05-09 | 2015-08-05 | 上海发电设备成套设计研究院 | Count the dynamic property of shafting computation model method for building up of spring foundation coupled vibrations |
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