Spring vibration isolation support base structure applied to 300MW compressed air energy storage power station and vibration control and optimization method of spring vibration isolation support base structure

Abstract

The invention relates to a spring vibration isolation support base structure applied to a 300MW compressed air energy storage power station and a vibration control and optimization method of the spring vibration isolation support base structure. The spring vibration isolation support base structure comprises a base platen, a stand column and a plurality of spring vibration isolation supports arranged between the base platen and the stand column. The vibration control and optimization method comprises the steps that a finite element simulation model of the spring vibration isolation support base structure is established, and modal analysis and harmonic response analysis are conducted on different spring parameter combinations and structure size schemes through the finite element simulation model; the rigidity setting and arrangement scheme of the spring vibration isolation support is optimized according to the analysis result; manufacturing a reduced scale test model, and carrying out a modal test and a dynamic response test; and checking and adjusting the simulation model according to a test result, and determining an optimized spring vibration isolation support parameter and a spring vibration isolation support foundation structure scheme. Vibration of equipment disturbance force transmitted to the stand column is effectively attenuated.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of vibration control and the technical field of power infrastructure, and particularly relates to a spring vibration isolation support foundation structure applied to a 300MW-level compressed air energy storage power station and a vibration control and optimization method thereof. BACKGROUND

[0002] With the continuous increase of unit capacity, various complex dynamic loads generated during the operation of power equipment put forward higher requirements for the vibration stability of the foundation structure. The large turbine unit or compressor unit in the 300MW-level compressed air energy storage power station is prone to cause excessive foundation vibration during frequent start-stop and variable working conditions. The existing technology mainly studies the dynamic performance of the foundation through finite element simulation analysis and scale model test, but the finite element results depend on the accuracy of model simplification, boundary condition setting and material parameters, and it is difficult to completely reflect the nonlinear characteristics and complex working conditions of the actual structure. The traditional rigid frame foundation only relies on its own weight and stiffness to suppress vibration, lacks active adjustment means, and in the variable speed or sudden load working condition, the vibration energy is easily transmitted to the surrounding structure through the foundation, causing secondary noise, and it is difficult to meet the strict requirements of precision equipment such as compressors on the foundation vibration displacement.

[0003] In related technologies, CN118965711A discloses a 300MW-level compressed air energy storage power station air compressor foundation evaluation and optimization method, which includes establishing multiple numerical simulation models, calculating the foundation vibration speed and displacement peak under load, and checking the model accuracy combined with physical model test. This method uses high speed, multiple disturbance frequency calculation and speed and displacement double control standards to analyze and optimize the foundation structure, ensuring that the dynamic performance of the rigid foundation meets the requirements of the 300MW-level compressed air energy storage power station. However, this scheme focuses on the performance evaluation of the rigid foundation, does not use spring vibration isolation and other isolation means, and does not specifically design the separation of the foundation natural frequency and the equipment disturbance frequency, so there is still room for further optimization. SUMMARY

[0004] The purpose of the present application is to solve the problems in the background art, and to provide a spring vibration isolation support foundation structure applied to a 300MW-level compressed air energy storage power station and a vibration control and optimization method thereof. By reducing the vibration transmission efficiency through elastic support, isolating the dynamic coupling between the equipment and the foundation, and reducing structural noise and fatigue damage, the stability and safety of large unit operation can be significantly improved.

[0005] The technical scheme adopted by the application is: a spring vibration isolation support foundation structure applied to a 300 MW compressed air energy storage power station and a vibration control and optimization method thereof, the spring vibration isolation support foundation structure comprises a foundation slab, a column and a plurality of spring vibration isolation supports arranged between the foundation slab and the column; each spring vibration isolation support is combined by a plurality of spring units; a first order natural frequency of the spring vibration isolation support foundation structure as a whole is designed to be staggered with a main disturbance force frequency of a turbine generator set or a compressor set; the spring vibration isolation support is integrally fixed with the bottom of the foundation slab and the top of the column through a connecting pad; the spring vibration isolation support is uniformly arranged along a preset position of the bottom of the foundation slab to share the equipment load; the vibration control and optimization method comprises: establishing a finite element simulation model of the spring vibration isolation support foundation structure, and performing modal analysis and harmonic response analysis on different spring parameter combinations and structure size schemes by using the finite element simulation model; the stiffness setting and arrangement scheme of the spring vibration isolation support are optimized according to the analysis results; a scale test model is made and modal test and dynamic response test are performed; the simulation model is checked and adjusted according to the test results, and the optimized spring vibration isolation support parameters and spring vibration isolation support foundation structure scheme are determined.

[0006] More preferably, the spring vibration isolation supports are integrally connected and arranged through the upper connecting pad, the lower connecting pad and the column top reinforcing steel plate of the top of the column with the bottom of the foundation slab.

[0007] More preferably, the lower end of the column is fixed on the elastic bottom plate.

[0008] More preferably, each spring unit comprises at least two metal spiral springs in parallel combination.

[0009] More preferably, the different spring units are configured in series or in parallel to meet different stiffness or natural frequency design requirements.

[0010] More preferably, the spring vibration isolation supports are arranged in advance along the lower part of the foundation slab, and at least one spring vibration isolation support is arranged at the root of each column to realize uniform support and vibration isolation of the equipment load.

[0011] More preferably, a finite element simulation model of the spring vibration isolation support foundation structure is established, dynamic characteristics simulation is performed on a plurality of structure schemes with different foundation slab thicknesses, column cross sections and spring stiffness parameter combinations, harmonic response analysis is adopted to calculate the vibration displacement amplitudes at the disturbance force loading points in each scheme, and the structure form and spring vibration isolation support parameters are adjusted to optimize the foundation vibration performance.

[0012] More preferably, the vibration response peak values of different schemes are combined and evaluated by using the square root and square sum SRSS method to obtain the overall vibration response index of the structure.

[0013] More preferably, a scale test model of the spring vibration isolation support foundation structure is made, and modal test and forced vibration test are carried out on the model by using space excitation and multi-point measurement, and the test results are compared with the numerical simulation results for checking the simulation model and guiding the final design of the vibration isolation support parameters.

[0014] More preferably, the vertical stiffness and horizontal stiffness of each spring vibration isolation support can be obtained by adjusting the spring diameter, spring distance, height and number of single springs and the like.

[0015] Compared with the prior art, the spring vibration isolation support foundation structure has the following beneficial effects: The spring vibration isolation support foundation structure effectively realizes the dynamic decoupling between the equipment and the foundation. The simulation and test results show that, compared with the traditional rigid foundation, the vibration response of the spring vibration isolation support foundation at each disturbance point is significantly reduced in the vertical, transverse and longitudinal directions, and meets the specification limit requirements; the spring vibration isolation support foundation structure effectively attenuates the vibration of the equipment disturbance force transmitted to the column, and weakens the vibration amplitude of the column top and the platform. The spring vibration isolation design can significantly reduce the influence of foundation vibration on the surrounding environment, prolong the fatigue life of the equipment, and adapt to variable load conditions, and is an effective technical approach to meet the vibration control requirements of the compressor unit and improve the dynamic performance of the foundation.

[0016] The spring vibration isolation support foundation structure adopts multiple structure optimization schemes for finite element model numerical simulation analysis. A fine finite element model is established, and the calculation results of the foundation dynamic characteristics and dynamic response are compared when various structure parameters are compared, and the analysis differences caused by the influence factors of various parameters are analyzed.

[0017] The spring vibration isolation support foundation structure is analyzed by a scale physical model test, and the modal test analysis, response prediction analysis and other test methods are used for the turbine generator foundation scale physical model to comprehensively analyze the dynamic performance of the spring vibration isolation support foundation structure in terms of dynamic characteristics and dynamic response of the vibration isolation dynamic foundation.

[0018] The spring vibration isolation support foundation structure of the turbine generator is comprehensively evaluated in terms of dynamic performance. The dynamic performance of the turbine generator dynamic foundation is combined with numerical simulation and physical model test, the similarities and differences between the finite element model calculation results and the physical model test are compared, the universality of the spring vibration isolation support foundation structure of the turbine generator in terms of dynamic characteristics and dynamic response is summarized, the difference reasons between simulation analysis and model test are analyzed, and the dynamic characteristics and dynamic response of the spring vibration isolation dynamic foundation are comprehensively evaluated. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Fig. 1 is a structural schematic diagram of the spring vibration isolation support foundation structure of the present application; Figure 2 Fig. 2 is a structural schematic diagram of the spring vibration isolation support of the present application; Figure 3 This is a flowchart of the vibration control and optimization method of the present invention.

[0020] In the figure, 1-spring vibration isolation support (11-upper connecting pad, 12-lower connecting pad, 13-spring unit), 2-foundation platform, 3-column (31-column top reinforcing steel plate), 4-elastic base plate. Detailed Implementation

[0021] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] like Figure 1 As shown, the spring vibration isolation support foundation structure of the present invention includes a foundation plate 2, a column 3, and several spring vibration isolation supports 1 disposed between the foundation plate 2 and the column 3; each spring vibration isolation support 1 is composed of multiple spring units 13; the first natural frequency of the overall spring vibration isolation support foundation structure is designed to be offset from the main disturbance frequency of the turbine generator set or compressor set; the spring vibration isolation supports 1 are integrally fixed to the bottom of the foundation plate 2 and the top of the column 3 by connecting pads; the spring vibration isolation supports 1 are evenly distributed along a preset position at the bottom of the foundation plate 2 to distribute the equipment load. Figure 2 As shown, the spring vibration isolation support 1 is integrally connected to the bottom of the foundation plate 2 and the top of the column 3 via the upper connecting plate 11 and the lower connecting plate 12. The lower end of the column 3 is fixed to the elastic base plate 4. The foundation plate 2, the column 3, and the elastic base plate 4 form the foundation of the turbine generator set or compressor set. Each spring unit 13 includes at least two metal helical springs connected in parallel. The spring vibration isolation supports are pre-arranged along the lower part of the foundation plate, and at least one spring vibration isolation support 1 is set at the base of each column to achieve uniform support and vibration isolation of the equipment load. Different spring units 13 are connected in series or in parallel to meet different stiffness or natural frequency design requirements. The vertical stiffness and horizontal stiffness of each spring vibration isolation support 1 can be obtained by adjusting parameters such as the spring diameter, spring pitch, height, and number of single springs.

[0023] like Figure 3As shown, the vibration control and optimization method includes: establishing a finite element simulation model of the spring vibration isolation support foundation structure, and using the finite element simulation model to perform modal analysis and harmonic response analysis on different spring parameter combinations and structural size schemes; optimizing the stiffness setting and arrangement scheme of the spring vibration isolation support according to the analysis results; making a scale test model and performing modal test and dynamic response test; according to the test results, checking and adjusting the simulation model to determine the optimized spring vibration isolation support parameters and spring vibration isolation support foundation structure scheme.

[0024] A finite element simulation model of the spring vibration isolation support foundation structure is established, and dynamic characteristics simulation is performed on multiple structural schemes with different foundation slab thicknesses, column cross sections, and spring stiffness parameter combinations. Harmonic response analysis is used to calculate the vibration displacement amplitudes at the disturbance force loading points in each scheme, and the structure form and spring vibration isolation support parameters are adjusted to optimize the foundation vibration performance.

[0025] The peak values of vibration responses of different schemes are combined and evaluated using the square root sum and square sum SRSS method to obtain the overall vibration response index of the structure.

[0026] A scale test model of the spring vibration isolation support foundation structure is made, and spatial excitation multi-point measurement is used to perform modal test and forced vibration test on the model. The test results are compared and analyzed with the numerical simulation results to check the simulation model and guide the final design of the vibration isolation support parameters.

[0027] Embodiment 1 The existing 300MW-level compressed air energy storage power station dynamic foundation design lacks active vibration isolation measures, and the foundation vibration control capability is insufficient, which is difficult to cope with the vibration challenges of high-power units under variable speed and load mutation conditions. In view of the above problems, the present embodiment provides a spring vibration isolation support foundation structure applied to a 300MW-level compressed air energy storage power station and a vibration control and optimization method thereof. By designing vibration isolation supports with adjustable stiffness and staggering the foundation frequency and disturbance frequency, the vibration isolation performance of the foundation is improved, and simulation and test verification are performed to ensure that the foundation dynamic response meets the specification limit. The core is to combine multiple spring vibration isolation supports and adjust their stiffness characteristics to stagger the natural frequency of the foundation structure with the disturbance frequency of the generator set and the compressor set, to achieve efficient suppression and dynamic isolation of low-frequency vibration; at the same time, numerical simulation and test are combined to optimize the foundation structure parameters and support arrangement scheme to meet the strict requirements of 300MW-level compressors on vibration control.

[0028] Establishing numerical simulation optimization analysis model: Finite element software is used to establish rigid foundation model and spring isolation foundation model, and different structural parameter schemes are analyzed. Specifically, hexahedral solid element grid (such as solid185 solid element) can be used in ABAQUS software and ANSYS software to divide the grid of foundation structure (spring isolation support foundation structure), ensure that the equipment mass is equivalent to the node of the platform, and set different foundation platform thickness (such as 2.3-2.7m), column section size (such as 1.0-1.4m), and different spring stiffness and height parameters according to the scheme. Modal analysis is carried out on each scheme to obtain the overall mode shape and local mode shape; then the vertical, horizontal and longitudinal vibration displacement amplitudes of the key disturbance points of the equipment in each scheme under the action of the set disturbance force load are calculated by the harmonic response analysis method, and compared with the speed displacement limit value specified in the industry standard, so as to evaluate the effect of each vibration control scheme and select the optimal structural scheme.

[0029] Design and production of scale physical model: According to the similarity principle, a 1:10 scale physical test model is constructed. First, the corresponding geometric, mass and stiffness similarity ratios are calculated according to the optimization scheme of rigid foundation and isolation foundation; then the support design is carried out for the spring isolation scheme: according to the requirement of the overall vibration frequency of the foundation and the vibration frequency of the equipment, the vertical deformation and stiffness of the required isolation support are calculated by using the natural frequency formula of the vibration system. Select appropriate spring diameter, pitch, height and number of turns to form the required stiffness of the spring isolation support by parallel combination of multiple single springs, and test the vertical and horizontal stiffness of the selected single spring and combined spring support to ensure that the design stiffness value is met. When installing the spring isolation support in the physical model, the spring support connection pad can be pre-buried in the concrete at the bottom of the platform and the top of the column, so as to integrate the spring isolation support with the overall foundation, so as to reduce the deviation caused by the height of the support from the ground.

[0030] Vibration test and analysis of scale model: Dynamic test is carried out on the completed scale isolation foundation model. Three-point space excitation (vertical, horizontal longitudinal, horizontal transverse) and multi-point sensor arrangement are used to carry out modal test on the model, and the modal frequency, damping ratio and mode shape of the model are obtained; at the same time, based on the modal test results, the corresponding modal participation factor is used in the simulation software to predict the forced vibration dynamic response of the model under the working speed. The dynamic characteristics obtained by the test are compared with the calculation results of the corresponding numerical simulation model to verify the accuracy of the simulation model, and the simulation model parameters are adjusted according to the comparison results to provide basis for further optimization design scheme. Finally, the final stiffness setting and arrangement scheme of the spring isolation support are determined by combining the simulation and test data, so as to realize effective control and optimization of the vibration of the turbine generator foundation.

[0031] Table 1-1 is a comparison of the optimized spring vibration isolation support foundation structure scheme and the vibration isolation support foundation structure scheme without the spring vibration isolation support: Table 1-1 Scheme Comparison It can be seen that: For the rigid frame dynamic foundation related parameters, reference is made to similar vibration isolation engineering related parameters, vibration isolation parameters are obtained through analysis and calculation, on this basis, the dynamic characteristics and dynamic response characteristics of the spring vibration isolation support foundation structure are analyzed, and the influence of the foundation slab and column section size on the structural dynamic performance is studied. Through numerical simulation analysis and calculation, the following conclusions are obtained: the vertical, horizontal and longitudinal vibration responses of each disturbance point of the spring vibration isolation support foundation structure of each optimization scheme meet the specification limit requirements; the dynamic foundation structure designed with spring vibration isolation can effectively decouple the dynamic action of the foundation slab and the column; for the vibration response of the foundation slab, the maximum vertical, horizontal and longitudinal vibration response of the spring vibration isolation support foundation structure is smaller than that of the rigid foundation; for the column vibration response, the vertical, horizontal and longitudinal vibration response of the spring vibration isolation support foundation structure is significantly smaller than that of the rigid foundation. Compared with the rigid foundation, the vibration isolation system effectively attenuates the vibration response of the equipment disturbance force transmitted to the column and the intermediate layer; through optimization scheme analysis of the spring vibration isolation support foundation structure, it is found that the smaller the size of the foundation slab and the column, the greater the vibration response value of each part of the structure, but it still meets the limit requirements; the stiffness of the lower part of the foundation slab of the spring vibration isolation support foundation structure is composed of two groups of units in series, the column and the spring vibration isolation support, the horizontal overall vibration natural frequency of the dynamic foundation is greatly affected by the column section size, the smaller the column section, the lower the natural frequency; the change of the column section has little effect on the vertical vibration natural frequency; compared with the rigid foundation, the natural frequency of each order of the spring vibration isolation support foundation structure is significantly reduced, the typical vibration mode characteristics of the spring vibration isolation support foundation structure are the slab overall vibration mode and the slab bending vibration mode, and the column vibration mode is less involved.

[0032] Example 2 In order to determine the stiffness and damping parameters of each spring vibration isolation support, spring vibration isolation support selection analysis needs to be carried out, a slab vibration isolation model is used to carry out spring vibration isolation support selection design, and according to existing engineering experience, the vertical design frequency of the spring vibration isolation support is preferably 3.5 Hz, and the horizontal stiffness is 0.37 times the vertical stiffness.

[0033] According to the single degree of freedom system natural frequency calculation formula (1-1), the vertical deformation of the spring vibration isolation support with a vertical frequency of 3.5 Hz can be calculated: Where ω is the frequency, g is the gravitational acceleration, and Δs is the vertical deformation.

[0034] The vertical deformation of the spring vibration isolation support can be calculated as 20mm according to formula (1-1), and the calculation The spring vibration isolation support stiffness also needs to obtain the support reaction force. Wherein, F is the support reaction force, k is the vibration isolation support stiffness, and Δs is the vertical deformation. Considering the design and construction convenience, the same spring vibration isolation support parameters are selected for each pair (a total of five pairs) of columns in the embodiment, that is, the larger value of the spring vibration isolation support stiffness of the left and right columns is selected as the design stiffness of the spring vibration isolation support of the pair of columns. The spring vibration isolation support parameters of each pair of columns are shown in Table 1-2.

[0035] Table 1-2: Spring vibration isolation support stiffness and damping parameters of each column The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. The contents not described in detail in the specification belong to the prior art known to the person skilled in the art.

Claims

1. A spring vibration isolation bearing foundation structure for a 300MW compressed air energy storage power station and its vibration control and optimization method, characterized in that: The spring vibration isolation support foundation structure includes a foundation plate, columns, and several spring vibration isolation supports disposed between the foundation plate and the columns; each spring vibration isolation support is composed of multiple spring units; the first natural frequency of the entire spring vibration isolation support foundation structure is designed to be offset from the main disturbance frequency of the turbine generator set or compressor set; the spring vibration isolation support is integrally fixed to the bottom of the foundation plate and the top of the column through connecting pads. The spring vibration isolation supports are evenly arranged at a preset position along the bottom of the foundation plate to share the equipment load. The vibration control and optimization method includes: establishing a finite element simulation model of the above-mentioned spring vibration isolation bearing foundation structure, and using the finite element simulation model to perform modal analysis and harmonic response analysis on different spring parameter combinations and structural size schemes; optimizing the stiffness setting and arrangement scheme of the spring vibration isolation bearing based on the analysis results; fabricating a scaled-down test model and conducting modal tests and dynamic response tests; verifying and adjusting the simulation model based on the test results, and determining the optimized spring vibration isolation bearing parameters and the spring vibration isolation bearing foundation structure scheme.

2. The spring vibration isolation support foundation structure and its vibration control and optimization method for a 300MW compressed air energy storage power station as described in claim 1, characterized in that: The spring vibration isolation supports are integrally connected to the bottom of the foundation platform and the top of the column reinforcement steel plate through the upper connecting plate and the lower connecting plate.

3. The spring vibration isolation support foundation structure and its vibration control and optimization method applied to a 300MW compressed air energy storage power station according to claim 1, characterized in that: The lower end of the column is fixed to the elastic base plate.

4. The spring vibration isolation support foundation structure and its vibration control and optimization method applied to a 300MW compressed air energy storage power station according to claim 1, characterized in that: Each spring unit comprises at least two metal helical springs connected in parallel.

5. The spring vibration isolation support foundation structure and its vibration control and optimization method for a 300MW compressed air energy storage power station as described in claim 4, characterized in that: The different spring units are configured in series or in parallel.

6. The spring vibration isolation support foundation structure and its vibration control and optimization method for a 300MW compressed air energy storage power station as described in claim 1, characterized in that: The spring vibration isolation supports are pre-arranged along the lower part of the foundation slab, and at least one spring vibration isolation support is installed at the base of each column.

7. The spring vibration isolation support foundation structure and its vibration control and optimization method for a 300MW compressed air energy storage power station as described in claim 1, characterized in that: A finite element simulation model of the above-mentioned spring vibration isolation bearing foundation structure was established. Dynamic characteristic simulations were performed on various structural schemes with different combinations of foundation plate thickness, column cross-section and spring stiffness parameters. Harmonic response analysis was used to calculate the vibration displacement amplitude at the disturbance force loading point in each scheme. Based on this, the structural form and spring vibration isolation bearing parameters were adjusted to optimize the foundation vibration performance.

8. The spring vibration isolation support foundation structure and its vibration control and optimization method for a 300MW compressed air energy storage power station as described in claim 7, characterized in that: The peak vibration response of different schemes was evaluated by combining the square root and sum of squares SRSS methods to obtain the overall vibration response index of the structure.

9. The spring vibration isolation support foundation structure and its vibration control and optimization method for a 300MW compressed air energy storage power station as described in claim 7, characterized in that: A scaled-down test model of the spring vibration isolation bearing foundation structure was constructed, and modal tests and forced vibration tests were conducted on the model using spatial excitation multi-point measurement. The test results were compared and analyzed with the numerical simulation results to verify the simulation model and guide the final design of the vibration isolation bearing parameters.

10. The spring vibration isolation support foundation structure and its vibration control and optimization method for a 300MW compressed air energy storage power station as described in claim 1, characterized in that: The vertical and horizontal stiffness of each spring vibration isolation support can be obtained by adjusting parameters such as the spring diameter, spring pitch, height, and number of single springs.

Images