CN106682328B - Vibration deformation measurement calculation method for vertical high-rise structure vibration isolation system - Google Patents
Vibration deformation measurement calculation method for vertical high-rise structure vibration isolation system Download PDFInfo
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Abstract
The invention relates to a method for calculating vibration deformation of a vertical towering structure vibration isolation system, which comprises the following steps: the method comprises the steps of vertical high-rise structure fine calculation, scale test model modal test and 3 vibration deformation estimation. The invention utilizes two vibration reduction principles and a scale test to synchronously carry out numerical simulation and model test, and finally establishes a set of complete and refined calculation and evaluation technology for the vibration deformation of the giant towering type air floatation vibration isolation system.
Description
Technical Field
The invention relates to the technical field of giant towering type micro-vibration control engineering, in particular to a vibration deformation measurement calculation method of a vertical towering structure vibration isolation system.
Background
At present, the micro-vibration control engineering aiming at the giant towering structure is mainly focused on the fields of advanced engineering such as aerospace, optical detection, weaponry and the like. The main design method is a conventional design method, namely, according to design targets and structural characteristics, structural design is carried out by utilizing specifications, and whether the check value meets requirements or not is observed to judge the rationality of the design scheme by checking the design scheme. The requirement of the micro-vibration design target is strict, but due to the characteristics of huge and high structure and complex system, the prior art cannot reasonably and effectively control the accuracy of the whole micro-vibration design process. Often results in either special conservation of engineering design and abnormally high cost price; or after the design and construction are finished, the difference between the actual measurement result of the engineering and the design expectation is very large, the design effect is difficult to ensure, and secondary design or transformation is caused. More specifically, the conventional design has the following drawbacks:
the effective guidance of concept design is lacked. The traditional design method mainly carries out structural design according to a micro-vibration design target and by combining with the process characteristics of a towering structure, usually ignores the feasibility of the practical operable level of a vibration control engineering system, and does not carry out effective design classification in the aspect of vibration control, namely lacks of effective guidance of conceptual design. For example, in the micro-vibration control project, multistage vibration reduction and isolation treatment is required, the vibration reduction and isolation measures in various projects have different effects, and the vibration reduction mode is gradually carried out by a vibration source, a transmission path, process equipment and the like, so that the conventional design scheme is not systematic, classified and unreasonable.
Lack of overall system refinement analysis. For the micro-vibration control project, the vibration control target is very strict compared with the conventional project, so it is also marked that the micro-vibration control project must be finely designed to achieve the target. In the conventional scheme, due to the fact that an engineering system is complex and lacks effective classification, and the multi-scale problem in the whole modeling cannot be solved, the whole effective fine modeling analysis cannot be carried out, and the design scheme lacks accuracy and effectiveness.
There is a lack of effective design solution correction measures. Conventional designs only perform verification of the design scheme through non-fine calculation and engineering experience estimation, so that effective design scheme correction measures are lacked. If some problems exist in the design scheme, a correction mechanism is not provided to effectively and locally design the structure in time, and the dynamic characteristic of the structure cannot be improved.
Disclosure of Invention
In order to overcome at least one of the above technical problems in the prior art, the present invention provides a method for calculating a vibration deformation of a vertical high-rise structure vibration isolation system, the method comprising:
1) vertical towering structure refinement calculation, which comprises the following sub-steps:
the basic structure design of the vertical high-rise structure,
establishing a finite element model, carrying out refined calculation on the vertical towering structure modal finite element,
local auxiliary transformation design;
carrying out refined numerical simulation on a dynamic response finite element of the vertical towering structure; and
calculating and analyzing the vertical towering structure modal to obtain the distribution characteristics of the huge towering structure modal;
2) the method comprises the following steps of (1) carrying out modal testing on a reduced scale test model, wherein the modal testing on the reduced scale test model comprises the following substeps:
a reduced scale test structure design, a reduced scale ratio not less than 1:5, an
The method comprises the steps of carrying out a structure modal hammering test and a power response test on a scale test to obtain structure modal distribution parameter information and a power response parameter rule of the scale test;
3) a vibration deformation amount estimation, the vibration deformation amount estimation comprising the sub-steps of:
comparing the vertical high-rise structure refined calculation result with the scale test model modal test result,
judging whether the modal design is reasonable or not, if not, judging whether the modal design is reasonable or not1≤[1]Returning to the step 1) of local auxiliary transformation design in the vertical towering structure fine calculation, and re-designing the local part if the design meets the requirement1≤[1]Then enter the actual vibration isolationEvaluating the vibration deformation of the system, wherein1Is an effective damping coefficient of a vertical high-rise structure1]Designing a critical damping coefficient for a vertical high-rise structure; and
and (3) evaluating the vibration deformation of the actual vibration isolation system, and extracting and processing the calculation result of the key parameters in the integral model according to the result of the vertical towering structure modal calculation analysis in the step 1) vertical towering structure refined calculation to obtain the vibration deformation of the vertical towering structure.
According to an embodiment of the present invention, the method further comprises determining whether to perform an air floating vibration isolation system design prior to step 1).
According to an embodiment of the present invention, the step of determining whether to design the air-floating vibration isolation system includes the following sub-steps:
determining the technological indexes of the vertical towering micro-vibration control system;
testing a site vibration environment, namely testing the external load level of the micro-vibration environment to acquire input information of power design;
determining a design scheme comprising a structural main body of the vertical high-rise system and an equipment foundation scheme;
finite element calculation, namely performing finite element engineering checking calculation on the design scheme;
judging whether to design an air-floatation vibration isolation system or not, when1RL≤[R]When the air floatation vibration isolation system is not needed, the air floatation vibration isolation system is not needed to be designed1 2RL≤[R]When the air floatation vibration isolation system is needed, the design is judged, wherein2Effective damping coefficient, R, for air-float vibration isolation systemLThe vibration influence level of the external vibration source is shown.
According to the embodiment of the invention, when the air floatation vibration isolation system is judged to be required to be designed, the step 3) further comprises the step of combining the air floatation vibration isolation system into the finite element model in the step 1) to perform secondary calculation, wherein the secondary calculation is between the judgment of whether the modal design is reasonable in the step 3) and the evaluation of the vibration deformation of the actual vibration isolation system.
According to the embodiment of the invention, a plurality of beneficial technical effects can be realized. For example, in the aspect of judging whether the conventional preliminary design scheme is subjected to air floatation type vibration isolation, the conventional design is carried out according to the basic design specifications of a building structure and power equipment, the micro-vibration design target of a huge high-rise structure is considered, two vibration isolation modes in a multistage vibration control concept are introduced, one part of the vibration isolation is carried out through the building structure, the other part of the vibration isolation is carried out through an air floatation vibration isolation device, two vibration isolation coefficients are determined, and whether the air floatation vibration isolation device is needed in the whole scheme is judged through the design analysis. The design mode has certain design guidance, and the design target, the structure design method, the finite element preliminary calculation and the two vibration reduction modes of the micro-vibration are considered, so that the micro-vibration control design scheme for the giant high-rise structure can be stripped into two vibration reduction measures in the early design process, one is pure structure power design, and the other is refined air flotation vibration reduction system design.
Because the two vibration controls are adopted, the vibration reduction coefficient value of the building structure can be obtained by analysis firstly1(effective damping coefficient) while setting an ideal design value by engineering experience1](design critical damping coefficient) by controlling1≤[1]Therefore, the rationality of the dynamic design of the building structure is ensured, the finite element model is finely calculated for the whole system in the process, and the calculation range covers the multi-scale problem of the system. The fine calculation of the giant vertical towering structure can be divided into two parts, namely the fine calculation of the overall primary design scheme of the vertical towering structure and the fine calculation after the local auxiliary transformation design and the power characteristic improvement are carried out. The structure refinement calculation covers dynamic response simulation calculation and modal analysis, and is beneficial to improving the accuracy of dynamic design of a complex system.
The micro-vibration control engineering of the giant towering structure is a complex system engineering, the complex problem can be decomposed into single problems by two vibration reduction design methods to be solved step by step, but the force is still insufficient, and in order to effectively guarantee the accuracy of structural power design, calibration is carried out through a reduced scale test. The basis for establishing the scale experiment model is the fine analysis result of the original model, namely the fine calculation result to a certain degree according to the original model. And establishing a reduced scale model, wherein the reduced scale proportion is preferably controlled within 1:5, and performing a vibration table test through the reduced scale model, wherein the test comprises a structural dynamic response simulation test and a modal test. The maximum advantage of the scale model is that the scale model can be applied to actual engineering by a conclusion of the test result guaranteeing regularity, and the local dynamic modification design of the high-rise structure can be carried out by utilizing the scale test result, so that the dynamic characteristic of the high-rise structure is improved.
On the basis of the above contents, through finite element refined calculation analysis and a reduced scale test simulation result, ideal structure deformation simulation data can be obtained from a refined numerical calculation result, and meanwhile, a refined model is corrected through a reduced scale test result, so that a design scheme is corrected, and the accuracy and the effectiveness of the overall structure dynamic design scheme are ensured.
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Fig. 1 is a flowchart of a method for calculating a vibration deformation amount of a vertical high-rise structure vibration isolation system according to an embodiment of the present invention.
Detailed Description
The following detailed description, taken in conjunction with the accompanying fig. 1, will be understood to be a better understanding of the invention with the intent to be understood by those skilled in the art, and not to limit the invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for calculating a vibration deformation amount of a vertical high-rise structure vibration isolation system according to an embodiment of the present invention.
In FIG. 1, the process of the present invention comprises four sections, namely sections I, II, III and IV.
Part I is the step of judging whether to design the air-floating vibration isolation system, which can include:
(1) and determining a process index, namely a vibration design target value, of the vertical type towering micro-vibration control system. In general, the process index can be preset, for example, by the owner, approved by the project implementer, or can be reviewed by industry experts with reference to the same kind of projects in the industry, and then confirmed.
(2) And testing the site vibration environment. The method mainly tests the external load level of the micro-vibration environment to obtain the input information of the dynamic design.
(3) Routine empirical design (deterministic design). The vibration isolation design can be carried out according to relevant standards of GB50463-2008 vibration isolation design Specification, the design input conditions comprise design targets and environmental loads, and the design contents comprise structural main bodies of the giant high-rise system and equipment foundation schemes.
(4) And (4) finite element calculation. And (4) carrying out finite element engineering checking calculation on the design scheme in the step (3), and calculating a model to be non-refined. Such computational models are well known to those skilled in the art.
(5) And judging whether the air floatation vibration isolation system exists. The two defense lines are adopted for control, and the main utilization is1RL≤[R]And1 2RL≤[R]making a judgment of the vibration isolation design wherein1The damping coefficient is effective for a vertical high-rise structure,2effective damping coefficient, R, for air-float vibration isolation systemLFor the vibration influence level of the external vibration source, [ R ]]For the design goal of vertical towering structure vibration1]Designing critical damping coefficient for vertical high-rise structure2]Is a damping coefficient of an air-float vibration isolation system, wherein1≤[1]，2≤[2]Design of critical vibration isolation coefficient [ c ]1]And 22]May be given by empirical values. When in use1RL≤[R]When the air floatation vibration isolation system is not needed, the air floatation vibration isolation system is not needed to be designed1 2RL≤[R]And judging that the design of an air floatation vibration isolation system is needed.
(6) And (3) an air floating type vibration isolation design. And (5) designing the giant high-rise structure air floating vibration isolation system according to the information in the step (5). The specific design of air-floating vibration isolation systems is well known to those skilled in the art and therefore the details of the solution are not described in detail.
Part II is a step of refining the vertical towering structure, which may include:
(7) the basic structure design of the vertical high-rise structure. The part is mainly based on the information of (5) to carry out structural design on the towering structure, and the design aim is to design1≤[1]Mainly ofThe content includes a towering-type structural body and an equipment foundation. More specifically, vibration tolerance objectives, multi-level vibration isolation parameters, finite element computational analysis, and the like, for example, may be included.
(8) And establishing a finite element model, and carrying out refined calculation on the modal finite element of the vertical towering structure. The modal finite element calculation is carried out on the preliminary design scheme in the step (7), but the structural finite element meshing quality is controlled through modal parameters, the refined modeling is realized, and the problem of inconsistent multi-scale modeling is solved.
More specifically, the refinement content may include: the integrated modeling of the towering structure is realized by adopting beam and shell units, the integrated modeling comprises an integrated structure and an auxiliary structure, and the participating modeling calculation of the auxiliary structure requires that all the mass of the towering structure is more than 1000Kg at 2/3 height, and all the mass of the towering structure is more than 300Kg at 2/3 height. On the basis, according to the Saint-Venn principle, floors needing detailed calculation and key beam column nodes are calculated according to entity units, and the equivalent boundary conditions calculated by simplifying the other parts into beam units are included for analysis. The unit sub-networks in the two refined calculation processes are counted as accuracy parameters according to the unit division density when the first-order mode is stable.
The above modeling can be implemented by those skilled in the art in conjunction with the prior art in light of the teachings of the present invention.
(9) And local auxiliary transformation design is carried out, and the dynamic characteristic of the structure is improved. And (5) locally modifying and designing the structural design scheme through the information of (8) and (15), so that the overall rigidity of the structure is increased, and the dynamic property of the structure is improved.
(10) And (3) carrying out refined numerical simulation on the dynamic response finite element of the vertical towering structure. And (3) utilizing the environmental vibration load, for example, obtaining the environmental vibration load through the step (2), combining the structural improvement design scheme in the step (9), finely adjusting the finite element model in the step (8), and performing structural dynamic calculation to obtain the dynamic response of the structure.
(11) And (5) calculating and analyzing the vertical towering structure modal. And (5) on the basis of the step (10), performing structural modal analysis to obtain the distribution characteristics of the giant towering structural modal.
Part III is a step of a reduced-scale test model mode test, which may include:
(12) designing and constructing a high-rise similar structure (a reduced scale test structure). And (4) designing and constructing a scale test model aiming at the giant high-rise structure based on the information (9), wherein the scale ratio is not lower than 1: 5.
(13) And carrying out a scale test structure modal hammering test and a dynamic response test. And performing a simulated vibration table test on the reduced scale test to obtain structural modal distribution parameter information and a dynamic response parameter rule of the reduced scale test.
More specifically, the method of scaled test model building may include:
the first scale modeling method is that vibration testing is carried out through the previous similar towering structure, calculation modeling analysis of the model is carried out, and modeling parameters of calculation modeling, including grid density, unit selection, elastic modulus, boundary conditions and other information, are corrected through actual measurement and comparison of calculation results and are used as reference basis for finite element analysis of the newly-built towering structure.
And a second reduced scale modeling method, namely establishing a new reduced scale physical model consistent with the drawing with the similarity ratio not less than 1:5, performing vibration test on the reduced scale towering model structure, performing calculation modeling analysis on the model, and correcting the modeling parameters of calculation modeling, including grid density, unit selection, elastic modulus, boundary conditions and other information, through actual measurement and comparison of calculation results, so as to serve as a reference basis for finite element analysis of a newly-built towering structure.
The calculation method and parameters for determining the reduced scale model still have certain errors with the actual situation, and at this time, multiple groups of model data fed back by multiple reduced scale models or mixed reduced scale models should be used as a correction basis.
The above modeling can be implemented by those skilled in the art in conjunction with the prior art in light of the teachings of the present invention.
Part IV is an estimate of the amount of vibration deformation, which may include:
(14) and comparing the actual vibration isolation system mode with the scale test mode. And (5) comparing and calibrating the original structure model of the (11) by using the data in the (13) as a standard, and entering into the (15).
(15) And the judgment mode is reasonable in design. The main purpose of the technology is to judge whether the simulation result of the towering structure numerical value is reasonably designed or not and whether the simulation result meets the requirements or not through the information input and the comparison calibration in the step (14)1≤[1]. If not satisfied1≤[1]Then returning to the step (9), and continuously and circularly correcting until the requirement is met1≤[1]Then, step (16) is entered.
(16) And adding a model into the air floating device of the vertical high vibration isolation system for secondary calculation. And (15) activating the air floatation vibration isolation device in a finite element refined model to participate in calculation, and inputting an external load to acquire structural dynamic response information.
(17) And evaluating the vibration deformation of the actual vibration isolation system. And (4) extracting and processing the calculation result of the key investigation point in the integral model according to the calculation in the step (16), wherein the result is the evaluation value of the vibration deformation of the giant towering structure.
It should be understood that, when it is determined in step (5) that the air flotation vibration isolation system is not designed, step (16) is not performed, and the extraction and processing of the calculation result of the key parameters in the integral model are directly performed according to the result of the calculation and analysis of the vertical towering structure mode in step (11), so as to obtain the vibration deformation amount of the vertical towering structure.
The method is mainly based on the theory of a micro-vibration control multi-level concept design method, and introduces two defense lines to carry out a preliminary design effectiveness judgment mechanism. By a conventional design method, an environmental vibration load test and a giant high-rise structure process condition are combined, conventional micro-vibration design is carried out, and a vibration reduction rate parameter is utilized to judge whether two defense lines are needed or not in a primary design scheme, namely whether an independent air floatation system design is needed or not. Therefore, the method is favorable for decomposing a complex structure into a plurality of simple problems to be processed step by step and guaranteeing the effectiveness of the vibration control method after implementation
Because the giant towering structure micro-vibration engineering is a system engineering and relates to the problem of multiple scales, the invention can effectively realize the fine modeling of the system engineering by two times of fine processing, namely integral fine processing and local fine processing, and can improve the precision of a calculation result.
In addition, for the huge towering structure, because the effectiveness of the design scheme is difficult to guarantee by numerical calculation alone, in order to more effectively improve the effectiveness of the design scheme, the scale test model adopted in the invention is used for testing the modes and the like, and qualitative regularity conclusion and quantitative response distribution information are obtained through test result analysis, so that the test result is compared with a refined numerical simulation result, the refined model is corrected and modified, the dynamic characteristic of the structure is finally improved, and the feasibility and the effectiveness of the numerical analysis result are favorably ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A vibration deformation measurement calculation method for a vertical high-rise structure vibration isolation system comprises the following steps:
1) vertical towering structure refinement calculation, which comprises the following sub-steps:
the basic structure design of the vertical high-rise structure,
establishing a finite element model, carrying out refined calculation on the modal finite element of the vertical towering structure, and locally assisting in transformation and design;
carrying out refined numerical simulation on a dynamic response finite element of the vertical towering structure; and
calculating and analyzing the vertical towering structure modal to obtain the modal distribution characteristics of the vertical towering structure;
2) the method comprises the following steps of (1) carrying out modal testing on a reduced scale test model, wherein the modal testing on the reduced scale test model comprises the following substeps: a reduced scale test structure design, a reduced scale ratio not less than 1:5, and
the method comprises the steps of carrying out a structure modal hammering test and a power response test on a scale test to obtain structure modal distribution parameter information and a power response parameter rule of the scale test; and
3) a vibration deformation amount estimation, the vibration deformation amount estimation comprising the sub-steps of:
comparing the vertical high-rise structure refined calculation result with the scale test model modal test result,
judging whether the modal design is reasonable or not, if not, judging whether the modal design is reasonable or not1≤[1]Returning to the step 1) of local auxiliary transformation design in the vertical towering structure fine calculation, and re-designing the local part if the design meets the requirement1≤[1]Then entering the vibration deformation evaluation of the actual vibration isolation system, wherein1Is an effective damping coefficient of a vertical high-rise structure1]Designing a critical damping coefficient for a vertical high-rise structure; and
and (3) evaluating the vibration deformation of the actual vibration isolation system, and extracting and processing the calculation result of the key parameters in the integral model according to the result of the vertical towering structure modal calculation analysis in the step 1) vertical towering structure refined calculation to obtain the vibration deformation of the vertical towering structure.
2. The method of claim 1, further comprising determining whether to perform an air-float vibration isolation system design prior to step 1).
3. The method of claim 2, wherein the step of determining whether to design the air-floating vibration isolation system comprises the sub-steps of:
determining the technological indexes of the vertical towering micro-vibration control system;
testing a site vibration environment, namely testing the external load level of the micro-vibration environment to acquire input information of power design;
determining a design scheme comprising a structural main body of the vertical high-rise system and an equipment foundation scheme;
finite element calculation, namely performing finite element engineering checking calculation on the design scheme; and
judging whether to design an air-floatation vibration isolation system or not, when1RL≤[R]When the air floatation vibration isolation system is not needed, the air floatation vibration isolation system is not needed to be designed1 2RL≤[R]When it is determined that it is necessary to performDesign of air-floating vibration isolation system, wherein2Effective damping coefficient, R, for air-float vibration isolation systemLFor the vibration influence level of the external vibration source, [ R ]]The design target is designed for the vibration of the vertical high-rise structure.
4. The method according to claim 2 or 3, wherein when the design of the air-floating vibration isolation system is determined to be needed, the step 3) further comprises the step of integrating the air-floating vibration isolation system into the finite element model in the step 1) to perform secondary calculation, and the secondary calculation step is between the determination of whether the modal design is reasonable and the evaluation of the vibration deformation of the actual vibration isolation system in the step 3).
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