CN109696396A - A kind of material damping test method - Google Patents
A kind of material damping test method Download PDFInfo
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- CN109696396A CN109696396A CN201811566710.5A CN201811566710A CN109696396A CN 109696396 A CN109696396 A CN 109696396A CN 201811566710 A CN201811566710 A CN 201811566710A CN 109696396 A CN109696396 A CN 109696396A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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Abstract
The present invention provides a kind of material damping test methods, the following steps are included: S1, load-bearing counterweight is pressed on measured material by square bearer, electromagnet is inhaled below counterweight, it is loaded using the magnet of same magnetic force, magnet is adsorbed in below counterweight when starting, then, it shakes lifting platform and pulls down electromagnet, pulling force size is measured by tensiometer；S2 makes electromagnet be detached from counterweight suddenly, gives a step excitation of load-bearing counterweight and square bearer, measure automatic vibration deamplification using acceleration transducer；S3 pre-processes the free vibration deamplification measured；S4, will be pretreated after free vibration deamplification identify the damping parameters such as attenuation coefficient and damping ratio using Logarithmic decrement method using the damping parameter etc. of parameter identification method identification material；The present invention can be reduced the vibration damping scheme test work load during product design and advanced development, and overall design work is assisted to obtain better Vibration Absorption Designing scheme under the premise of resource consumption is not increased.
Description
Technical field
The present invention relates to damping test technical fields, and in particular to a kind of material damping test method.
Background technique
In recent years, the continuous improvement with consumer to household electrical category product and precise electronic product quality requirements,
The control of the vibration and noise of product itself and manufacturing process, becomes technical research focus of attention.
On the one hand, under the premise of function and performance reach certain level, the vibration of the product course of work and noise become
Evaluate the important indicator of product quality.For example, the products such as domestic air conditioning, refrigerator, washing machine, in addition to Energy Efficiency Ratio, failure rate etc.
Outside basic performance indices, the vibration and noise that the product course of work generates directly influence the user experience effect of product.Cause
This, vibration and noise level are brand manufacturers and the technical essential that consumer pays close attention to jointly.
On the other hand, in the manufacturing process of consumer product, vibration damping, the direct shadow of noise abatement of processing and assembly equipment
Ring the assembly precision of the machining accuracy and complete machine to part.Detection, calibration and the commissioning device of product are to ambient vibration and noise
More sensitive, the vibration damping of these equipment working environments, noise abatement directly influence the adjustment accuracy and Quality Detection of product
Consistency level.Therefore, vibration and noise control technology is also the technical requirements point of manufacturer's concern.
For problem above present on engineering and currently used rubber and polyurethane damping material performance parameter with
Non-linear relation between the factors such as load weight, vibration frequency, Oscillation Amplitude, the quasi- research of the present invention are ground suitable for specific product
Vibration Absorption Designing experimental method during hair.The purpose is to reduce the vibration damping schemes during product design and advanced development to test work
It measures, overall design work is assisted to obtain better Vibration Absorption Designing scheme under the premise of resource consumption is not increased.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of material damping test methods, to solve in background technique
The technical issues of.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of material damping test method, comprising the following steps:
S1, load-bearing counterweight are pressed on measured material by square bearer, and electromagnet is inhaled below counterweight, using same magnetic force
Magnet load, magnet is adsorbed in below counterweight when starting, then, is shaken lifting platform and is pulled down electromagnet, pulling force size is by pulling force
It measures；
S2 makes electromagnet be detached from counterweight suddenly, gives a step excitation of load-bearing counterweight and square bearer, magnet and counterweight
The critical attraction for being detached from moment makes measured material compressive deformation, after release, under the elastic potential energy effect of measured material, and bullet
Spring quality system starts free vibration, and due to the presence of material viscoelasticity, measured material is adopted by free vibration after step excitation
Automatic vibration deamplification is measured with acceleration transducer；
S3 pre-processes the free vibration deamplification measured；
S4, will be pretreated after free vibration deamplification, utilize the damping parameter of parameter identification method identification material
Deng identifying the damping parameters such as attenuation coefficient and damping ratio using Logarithmic decrement method.
Further, the pretreatment in the step S3 includes signal interception, goes trend and filtering.
Further, free vibration response is that impulse response or forced vibration respond in the step S2.
Further, the step excitation in the step S2 is tensioning method for releasing, makes material precompressed by tensioning equipment, is produced
Then raw initial deformation releases rapidly stretching force, make material under elastic potential energy effect free vibration since by step excitation
Vibrate quiescing process.
Further, in the tensioning method for releasing size of stretching force it is consistent, obtained by weighing force snesor, freely shaken
Dynamic response is obtained by acceleration transducer.
A kind of beneficial effect of material damping test method provided by the invention is:
1) test method of step excitation and simple harmonic oscillation excitation is used simultaneously to material property parameter and vibration isolation system
Unified test examination has made intensive studies, and the parameter identification method of time domain and frequency domain is combined accurately to carry out to rigidity and damping parameter
Estimation；
2) it is directed to vibrating isolation system test method, establishes corresponding mechanical model, designs a set of convenient and efficient, strong applicability material
Expect test machine system, in real time to material property parameter test and vibrating isolation system effectiveness in vibration suppression carry out data record, analysis and
As a result it stores；
3) tested on material testing machine for the performance parameter of material, on vibratory equipment platform given structure,
Vibrating isolation system is tested under weighing load, Oscillation Amplitude, vibration frequency, demonstrates rigidity and damping parameter with different items
Part and the non-linear relation embodied, it was confirmed that by the correct inference of the approximately linear model of damping model, under prescribed conditions,
It can be gone to understand the vibrating isolation system that practical damping material is constituted with linear model.Effectiveness in vibration suppression can be reached in special frequency channel range simultaneously
To 99%, sufficiently show that the vibrating isolation system of research has good damping property.
Detailed description of the invention
Fig. 1 is step flow chart of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Ability
Domain ordinary person every other embodiment obtained without making creative work, belongs to protection of the invention
Range.
A kind of embodiment: material damping test method.
A kind of material damping test method, comprising the following steps:
S1, load-bearing counterweight are pressed on measured material by square bearer, and electromagnet is inhaled below counterweight, using same magnetic force
Magnet load, magnet is adsorbed in below counterweight when starting, then, is shaken lifting platform and is pulled down electromagnet, pulling force size is by pulling force
It measures；
S2 makes electromagnet be detached from counterweight suddenly, gives a step excitation of load-bearing counterweight and square bearer, magnet and counterweight
The critical attraction for being detached from moment makes measured material compressive deformation, after release, under the elastic potential energy effect of measured material, and bullet
Spring quality system starts free vibration, and due to the presence of material viscoelasticity, measured material is adopted by free vibration after step excitation
Automatic vibration deamplification is measured with acceleration transducer, the object studied in the present embodiment is polyurethane damping material, is used
Be free vibration response, the method for use is tensioning method for releasing, it is a kind of step excitation, and this method is made by tensioning equipment
Material precompressed, generate initial deformation, then rapidly release stretching force, make material elastic potential energy effect under free vibration from by rank
Jump excitation starts vibration to quiescing process.The size of stretching force it is consistent, obtained by weighing force snesor, free vibration response by
Acceleration transducer obtains；
S3 pre-processes the free vibration deamplification measured, and pretreatment includes signal interception, goes trend and filter
Wave；
S4, will be pretreated after free vibration deamplification, utilize the damping parameter of parameter identification method identification material
Deng identifying the damping parameters such as attenuation coefficient and damping ratio using Logarithmic decrement method.
In the above-mentioned technical solutions, material can be estimated by the attenuation curve and damping recognizer that free vibration responds
Intrinsic frequency and damping parameter, suitable for soft or hard damping material, such as spring, foam, polyurethane；If not knowing
In the case where knowing material stiffness, the stiffness coefficient of different materials can be compared, can be suitably used for different load-bearing, the resistance of test material
Buddhist nun's parameter final purpose is to compare the damping property of material, and in actual production environment, the equipment under test of damping material vibration damping is held
Weight is different.
The above is presently preferred embodiments of the present invention, but the present invention should not be limited to embodiment and attached drawing institute public affairs
The content opened both falls within protection of the present invention so all do not depart from the lower equivalent or modification completed of spirit disclosed in this invention
Range.
Claims (5)
1. a kind of material damping test method, which comprises the following steps:
S1, load-bearing counterweight are pressed on measured material by square bearer, and electromagnet is inhaled below counterweight, using the magnet of same magnetic force
Load, magnet is adsorbed in below counterweight when starting, then, is shaken lifting platform and is pulled down electromagnet, pulling force size is measured by pulling force
?；
S2 makes electromagnet be detached from counterweight suddenly, gives a step excitation of load-bearing counterweight and square bearer, and magnet and counterweight are detached from
The critical attraction of moment makes measured material compressive deformation, after release, under the elastic potential energy effect of measured material, and spring matter
Amount system starts free vibration, and due to the presence of material viscoelasticity, measured material is by free vibration after step excitation, using adding
Velocity sensor measures automatic vibration deamplification；
S3 pre-processes the free vibration deamplification measured；
S4, will be pretreated after free vibration deamplification made using the damping parameter etc. of parameter identification method identification material
The damping parameters such as attenuation coefficient and damping ratio are identified with Logarithmic decrement method.
2. material damping test method as described in claim 1, it is characterised in that: the pretreatment in the step S3 includes letter
Number interception, go trend and filtering.
3. material damping test method as claimed in claim 2, it is characterised in that: free vibration, which responds, in the step S2 is
Impulse response or forced vibration response.
4. material damping test method as described in claim 1, it is characterised in that: the step excitation in the step S2 is
Method for releasing is drawn, material precompressed is made by tensioning equipment, generates initial deformation, stretching force is then released rapidly, makes material in elasticity
Potential energy acts on lower free vibration since vibration by step excitation to quiescing process.
5. material damping test method as claimed in claim 4, it is characterised in that: stretching force is big in the tensioning method for releasing
Small is consistent, is obtained by weighing force snesor, and free vibration response is obtained by acceleration transducer.
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| CN201811566710.5A CN109696396A (en) | 2018-12-19 | 2018-12-19 | A kind of material damping test method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702389A (en) * | 2019-10-09 | 2020-01-17 | 北京建筑大学 | Additional damping measuring device and measuring method thereof |
| CN111174969A (en) * | 2020-03-06 | 2020-05-19 | 合肥工业大学 | Dynamic calibration equipment for multi-dimensional force sensor generating negative step |
| CN112268814A (en) * | 2020-10-10 | 2021-01-26 | 珠海格力绿色再生资源有限公司 | Abnormal sound resistant material evaluation method and device |
| CN113532781A (en) * | 2021-08-26 | 2021-10-22 | 青岛科技大学 | Magnetic type quick-combination square mass system with guide device |
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| CN101178349A (en) * | 2006-11-10 | 2008-05-14 | 北京有色金属研究总院 | Equipment and method for measuring material damping factor |
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| CN101178349A (en) * | 2006-11-10 | 2008-05-14 | 北京有色金属研究总院 | Equipment and method for measuring material damping factor |
| CN202814855U (en) * | 2012-09-27 | 2013-03-20 | 贵阳联洪合成材料厂 | Device for determining damping coefficient |
| CN107063611A (en) * | 2017-04-11 | 2017-08-18 | 中国电力科学研究院 | Pillar class composite electrical equipment vibration prevention appraisal procedure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702389A (en) * | 2019-10-09 | 2020-01-17 | 北京建筑大学 | Additional damping measuring device and measuring method thereof |
| CN110702389B (en) * | 2019-10-09 | 2021-08-10 | 北京建筑大学 | Additional damping measuring device and measuring method thereof |
| CN111174969A (en) * | 2020-03-06 | 2020-05-19 | 合肥工业大学 | Dynamic calibration equipment for multi-dimensional force sensor generating negative step |
| CN112268814A (en) * | 2020-10-10 | 2021-01-26 | 珠海格力绿色再生资源有限公司 | Abnormal sound resistant material evaluation method and device |
| CN113532781A (en) * | 2021-08-26 | 2021-10-22 | 青岛科技大学 | Magnetic type quick-combination square mass system with guide device |
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Application publication date: 20190430 |