CN108204929B - Technology for rapidly judging engineering application conditions of polyurethane vibration isolator - Google Patents
Technology for rapidly judging engineering application conditions of polyurethane vibration isolator Download PDFInfo
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- CN108204929B CN108204929B CN201711496068.3A CN201711496068A CN108204929B CN 108204929 B CN108204929 B CN 108204929B CN 201711496068 A CN201711496068 A CN 201711496068A CN 108204929 B CN108204929 B CN 108204929B
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- vibration isolation
- polyurethane
- frequency
- isolator
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 49
- 239000004814 polyurethane Substances 0.000 title claims abstract description 49
- 238000005516 engineering process Methods 0.000 title description 7
- 238000002955 isolation Methods 0.000 claims abstract description 76
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000007613 environmental effect Effects 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 description 13
- 238000004364 calculation method Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012850 discrimination method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
Abstract
The application discloses a method for rapidly judging engineering application conditions of a polyurethane vibration isolator, which comprises the following steps: step 1: obtaining excellent frequency of vibration isolation objectExcellent frequency of environmental vibrationStep 2: determining vibration isolation object type, comparing object excellent frequencyExcellent frequency of environmental vibrationWhen (when)When the vibration isolation object is determined to be I typeWhen the vibration isolation object is determined to be II typeWhen the vibration isolation is within the range of 2.0-5.0, judging that the vibration isolation is not applicable to polyurethane; step 3: when the vibration isolation object is in class I, detecting the self-vibration frequency f of the polyurethane vibration isolator Q When f Q Satisfy the following requirementsWhen the polyurethane vibration isolator meets the vibration isolation requirement, the polyurethane vibration isolator is judged to not meet the vibration isolation requirement; step 4: when the vibration isolation object is II type, detecting the self-vibration frequency f of the polyurethane vibration isolator Q When f Q Satisfy the following requirementsAnd when the polyurethane vibration isolator is judged to meet the vibration isolation requirement, otherwise, the polyurethane vibration isolator is judged to not meet the vibration isolation requirement.
Description
Technical Field
The application relates to the field of vibration control, in particular to a technology for rapidly distinguishing applicable conditions of polyurethane vibration isolator engineering
Background
When the conventional judging method is used for judging the applicability of the polyurethane vibration isolator to the actual engineering, the conventional engineering experience or a large number of calculation and model analysis are mainly used, but the conventional method has obvious defects, the engineering experience often cannot accurately reflect the actual engineering, and the large number of calculation analysis and model analysis take a long time, so that the applicability and the effectiveness of the polyurethane vibration isolator cannot be judged rapidly and accurately. Summarizing, the conventional discrimination method has the following drawbacks: [03] according to engineering experience, the actual engineering cannot be accurately reflected. When judging the practical engineering condition of the polyurethane vibration isolator according to the traditional judging method, the design experience of the similar engineering is often adopted, but vibration sources (power equipment, rail traffic and ground surface environment vibration) of different vibration isolator engineering and harm to surrounding vibration sensitive objects are not identical, if the judgment is carried out only according to the engineering experience, the practical condition of the engineering cannot be accurately reflected, and the applicability or the effectiveness of the polyurethane vibration isolator is difficult to judge.
Based on the large number of computational analyses, it is time consuming. The traditional method for judging the suitability of the polyurethane vibration isolator according to a large number of calculation and analysis is characterized in that the vibration response of a vibration sensitive object after the polyurethane vibration isolator is obtained through a large number of calculation and analysis and is compared with an allowable value according to vibration information of various vibration sources obtained through testing, and the suitability of the polyurethane vibration isolator is judged. The method has the advantages of large data volume, very complex calculation process and long time consumption, and is difficult to execute in actual engineering needing to rapidly judge the effectiveness of the vibration isolation pad.
The model test time is long and the cost is high. And (3) model test, namely, corresponding test is carried out on the scaled-down or equal-ratio model, so as to obtain related data and check design defects. The model test can accurately reflect the vibration response of the vibration isolation object and directly test the vibration isolation effect of the polyurethane vibration isolator, but the whole flow of the model test from the design test scheme, model manufacture and loading test needs longer time, and the cost of the whole test process is higher, so that the model test is only suitable for projects with special requirements and is not suitable for common vibration isolation projects.
Thus, there is a need for new technologies in this respect.
Disclosure of Invention
In order to overcome at least one of the technical problems in the prior art, the application provides a method for rapidly judging the engineering application conditions of a polyurethane vibration isolator, which comprises the following steps:
obtaining excellent frequency of vibration isolation objectExcellent frequency of environmental vibrations->
Determining vibration isolation object type, comparing object excellent frequencyExcellent frequency of environmental vibrations->When (when)When the vibration isolation object is determined to be I type, when +.>When the vibration isolation object is determined to be II type, when +.>When the vibration isolation is within the range of 2.0-5.0, judging that the vibration isolation is not applicable to polyurethane;
when the vibration isolation object is in class I, detecting the self-vibration frequency f of the polyurethane vibration isolator Q When f Q Satisfy the following requirementsWhen the polyurethane vibration isolator meets the vibration isolation requirement, the polyurethane vibration isolator is judged to not meet the vibration isolation requirement;
when the vibration isolation object is II type, detecting the self-vibration frequency f of the polyurethane vibration isolator Q When f Q Satisfy the following requirementsAnd when the polyurethane vibration isolator is judged to meet the vibration isolation requirement, otherwise, the polyurethane vibration isolator is judged to not meet the vibration isolation requirement.
According to one embodiment of the application, wherein the natural frequency f Q ∈[6，12]。
The application mainly aims at the use condition of the polyurethane vibration isolator in the current vibration isolation control engineering of the subway upper cover building, and provides a vibration isolation effectiveness rapid judging technology based on the excellent frequency band relation of the frequent environmental vibration and the subway traffic vibration.
The application is based on vibration isolation theory and polyurethane vibration isolator technology, according to the vibration control design target, combining engineering vibration data and vibration isolation attenuation coefficient theory, determining the quantitative boundary value of the discrimination parameter by simple numerical calculation aiming at the surface environment vibration characteristic and external excitation vibration characteristic of a specific engineering project, finding the discrimination condition applied to the fit engineering, and finally determining whether the polyurethane vibration isolator has applicability and effectiveness in the actual engineering
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other technical solutions may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow diagram of a method according to one embodiment of the application;
fig. 2 is a schematic diagram of a frequency range corresponding to an effective vibration isolation area when a vibration isolation object according to an embodiment of the present application is a type I vibration isolation object;
fig. 3 is a schematic diagram of the frequency ranges corresponding to the effective vibration isolation regions when the vibration isolation object is class II according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present application, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be realized without these technical details and various changes and modifications based on the following embodiments.
FIG. 1 is a schematic flow diagram of a method according to one embodiment of the application; fig. 2 is a schematic diagram of a frequency range corresponding to an effective vibration isolation area when a vibration isolation object according to an embodiment of the present application is a type I vibration isolation object; fig. 3 is a schematic diagram of the frequency ranges corresponding to the effective vibration isolation regions when the vibration isolation object is class II according to an embodiment of the present application.
Referring to fig. 1, according to the method of the present application, before the discrimination work is performed, it is necessary to pay explicit attention to data, provide data support for the subsequent operation, and perform the vibration test on the data that cannot be directly acquired. Excellent frequencies of externally excited vibrations, e.g. of test vibration-isolated objectsEnvironmental vibration excellent frequency->Etc. The test methods for excellent frequencies are well known to those skilled in the art and are therefore not described in detail.
The research of the application shows that the excellent frequency of the external excitation vibration can be comparedAnd excellent frequency of environmental vibrationAnd determining the proper ratio type and judging whether the polyurethane vibration damping pad meets the requirement.
In comparison withAnd->Previously, the vibration response limit value R of the vibration isolation object can be determined]Namely, the allowable value of vibration and the response of the environmental vibration before vibration isolation +.>Response to externally excited vibrations->Relationship between, in general, [ R ]]Is greater than->But far less than +.>
In general vibration control engineering, vibration isolation objects can be divided into two types, one type is power equipment vibration, and the excellent frequency band is higherThe other type is rail transit near-surface vibration, and the prominent frequency band is lower,/->At the same time, the general environmental vibration is excellent in frequency band->The discrimination criteria can be classified into two categories according to the ratio of the excellent frequency of the vibration isolation object to the excellent frequency of the environmental vibration, wherein +.>When the vibration isolation object is determined to be I type, when +.>And when the vibration isolation object is determined to be class II. When->When the vibration isolation object is more than or equal to 2.0 and less than or equal to 5.0, the polyurethane vibration isolation can be judged to be not applicable to the vibration isolation object any more, and then the structure selection should be changed to replace the vibration isolation material.
It has been found that corresponding criteria can be selected based on the above ratios. More specifically, according to the relevant regulations of vibration isolation theory and national standard, on the premise of meeting the vibration control target, the application provides the engineering applicability discrimination standard for two types of polyurethane vibration isolators. In the case of class I, the effective vibration isolation frequency range of the polyurethane vibration isolation, i.e. the natural vibration frequency f Q Should satisfyAs shown in fig. 2. Therefore, when the vibration isolation object is in the I type, the self-vibration frequency f of the polyurethane vibration isolator is detected Q When f Q Satisfy->And when the polyurethane vibration isolator is judged to meet the vibration isolation requirement, otherwise, the polyurethane vibration isolator is judged to not meet the vibration isolation requirement. In the case of class II, the effective vibration isolation frequency range of the polyurethane vibration isolation, i.e. the natural vibration frequency f Q Should satisfy->As shown in fig. 3, if this condition is satisfied, the polyurethane vibration isolator is suitable, and otherwise, the vibration reduction and isolation requirements cannot be satisfied. Generally, the natural frequency range of the polyurethane vibration isolator is 6-12Hz, and the engineering applicability is judged. According to the above, whether the polyurethane vibration damping pad meets the engineering applicability requirement is rapidly judged, and a conclusion is drawn.
The application has the following advantages:
1) The conceptual design logic is simple. Two main common types of compound vibration interference influences in the problem of subway upper cover building vibration are aimed at, namely:
the first method is that the vibration of external power equipment and the vibration of the environment are commonly influenced by the vibration of the building;
the second type is that the vibration of the external subway running near-surface vibration environment commonly produces vibration influence on the building.
For the two situations, two quantitative discrimination mechanisms are respectively established to guide whether the application range of vibration control is proper.
2) And the value parameters are quantized and calculated simply. Aiming at the two problems, two corresponding vibration isolation design conceptual models are respectively provided, and the values of parameters in the vibration isolation design conceptual models are quantitatively determined. On the one hand, determining the value of the central frequency of the excellent frequency band; on the other hand, the discrimination boundary value of the effective vibration isolation area is determined. The value taking method is simple, easy to obtain, simple in discrimination and calculation and small in calculated amount.
3) The judging process is efficient and quick. Aiming at the common two types of relations of the dynamic characteristics of the environment frequent vibration source and the subway traffic near-surface vibration source, the technology establishes an effective and excellent frequency band center frequency critical judgment quantification relation, and has the advantages of less calculation amount in the whole judgment process and clear regulations. From the collection of data to calculation, a large amount of time is saved, the conclusion reliability is high, the repeated redundant work is avoided, and the judging process is fast and effective.
In the description of the present specification, the descriptions of the terms "one embodiment," "one implementation," "example," "a particular example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (2)
1. A method for rapidly judging engineering application conditions of a polyurethane vibration isolator comprises the following steps:
step 1: obtaining excellent frequency of vibration isolation objectExcellent frequency of environmental vibrations->
Step 2: determining vibration isolation object type and comparing objectsExcellent frequencyExcellent frequency of environmental vibrations->When (when)When the vibration isolation object is determined to be I type, when +.>When the vibration isolation object is determined to be II type, when +.>When the vibration isolation is within the range of 2.0-5.0, judging that the vibration isolation is not applicable to polyurethane;
step 3: when the vibration isolation object is in class I, detecting the self-vibration frequency f of the polyurethane vibration isolator Q When f Q Satisfy the following requirementsWhen the polyurethane vibration isolator meets the vibration isolation requirement, the polyurethane vibration isolator is judged to not meet the vibration isolation requirement;
step 4: when the vibration isolation object is II type, detecting the self-vibration frequency f of the polyurethane vibration isolator Q When f Q Satisfy the following requirementsAnd when the polyurethane vibration isolator is judged to meet the vibration isolation requirement, otherwise, the polyurethane vibration isolator is judged to not meet the vibration isolation requirement.
2. The method according to claim 1, wherein the natural frequency f Q ∈[6，12]。
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| CN201711496068.3A CN108204929B (en) | 2017-12-31 | 2017-12-31 | Technology for rapidly judging engineering application conditions of polyurethane vibration isolator |
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| CN108204929B true CN108204929B (en) | 2023-11-21 |
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| CN105527063A (en) * | 2015-12-31 | 2016-04-27 | 重庆大学 | Test signal transmission damping device for strong torsional vibration transmission test |
| CN106290126A (en) * | 2016-07-29 | 2017-01-04 | 中车青岛四方机车车辆股份有限公司 | A kind of environmental suitability evaluation methodology of rail vehicle amortisseur elastomeric material |
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2017
- 2017-12-31 CN CN201711496068.3A patent/CN108204929B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000163078A (en) * | 1998-11-25 | 2000-06-16 | Chugoku Rubber Kogyo Kk | Vibration damping material |
| JP2005308732A (en) * | 2004-03-26 | 2005-11-04 | Sekisui Jushi Co Ltd | Vibration durability evaluation method for mark pillar |
| CN101314967A (en) * | 2008-07-01 | 2008-12-03 | 同济大学 | Indoor vibration isolation method for existent buildings at subway operation section |
| CN103047336A (en) * | 2012-12-25 | 2013-04-17 | 重庆市电力公司电力科学研究院 | Method for controlling structural acoustic transmission on basis of combined type vibration isolation device |
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| CN104455139A (en) * | 2014-11-07 | 2015-03-25 | 浙江大学 | Spring vibration isolating device and vibration isolating method based on self-adaption electromagnetic damping |
| CN104897276A (en) * | 2015-06-24 | 2015-09-09 | 大连理工大学 | Vibration isolation trench dynamic monitoring device and method based on difference wave spectrum analysis |
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| CN108204929A (en) | 2018-06-26 |
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