CN103308263A - Exciting device for testing modal of large structural component - Google Patents
Exciting device for testing modal of large structural component Download PDFInfo
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- CN103308263A CN103308263A CN2013101819044A CN201310181904A CN103308263A CN 103308263 A CN103308263 A CN 103308263A CN 2013101819044 A CN2013101819044 A CN 2013101819044A CN 201310181904 A CN201310181904 A CN 201310181904A CN 103308263 A CN103308263 A CN 103308263A
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Abstract
The invention relates to an exciting device for testing the modal of a large structural component. The exciting device comprises a force sensor, a hammer body and a counterweight, wherein the force sensor is arranged behind the hammer body; and the counterweight is arranged behind the force sensor. In order to overcome the defects of universal modal testing methods of the modal of the large structural component, such as a hammer method and a vibration exciter method, the invention provides the exciting device for testing the modal of the large structural component. The device plays a certain role in protecting the force sensor and can also prevent damaging the force sensor by too high vibration exciting force used for striking the large structural component.
Description
Technical field
What the present invention relates to is a kind of device for the structural member dynamic performance testing, specifically a kind of member mode proving installation.
Background technology
The mode test is the important means that obtains the structural member dynamic property, and can also estimate the fault that may exist with deagnostic structure spare, thereby reaches the effect of optimization, so the application of mode test in engineering field is very general.
Motivational techniques in the mode test have a lot, can employing power hammer, vibrator, physical environment encourages and the mode such as work load excitation.Find have a lot of articles that it is studied through literature search, these articles include the mode that above-mentioned the whole bag of tricks is measured large-sized structural parts." electrical network and clean energy resource " is the power hammer that adopts at " the large scale wind power machine blade modal test and analysis " of in November, 2012 publication as driving source, but power hammer method having relatively high expectations to percussion power, when test specimen is very large, will reduce signal to noise ratio (S/N ratio) if percussion power is too little, the hammer force that needs must be very large, otherwise be difficult to pound out the body vibration of test specimen, but easily cause the damage of power sensor when hammer force is excessive." Xi'an University of Architecture and Technology's journal " is to adopt vibrator as exciting source in " the Large Steam Turbine Sets combination frame formula foundation structure modal analysis of model " of in June, 2007 publication, but vibrator is during as excitation set, there is the shortcoming that difficulty, mobile inconvenience are installed, and vibrator also needs to be equipped with the equipment such as power amplifier and signal source, operates complicated.The push rod that is excited at the same time device contacts with structure all the time, may bring the impact of the aspects such as push rod and structure Coupling and rotational stiffness, the mode of structure may can be subjected to the impact of vibrator auxiliary equipment quality and rigidity in essence, and the impact of vibrator auxiliary equipment is very remarkable.What " vibration with impact " adopted in " research of Bridges Based on Ambient Excitation Modal Parameters Identification " of o. 11th publication in 2008 is the physical environment advocate approach, driving source is natural force, although its test does not need specific test condition, such as free support, but because exciting force is natural force, so be subject to the restriction of physical environment, the size of control exciting force that can not be artificial, and signal to noise ratio (S/N ratio) is lower, and not all large scale structure all is fit to this method." measuring technology journal " is " modal parameter under the large-scale machine arrangement works state extracts " of in June, 2004 publication, what this document adopted is the work load excitation, it is the method for extracting modal parameters the structural vibration measurement data that under working, obtains, be adapted to apply the occasion that artificial excitation or pumping signal can't be measured, but the modal parameter weak effect that the modal parameter that obtains by this energisation mode extraction obtains than the traditional exciting technique of employing, this method easily causes energy leakage, can not obtain accurate frequency response function.
The exciting force hammer is the important device that produces the structural member exciting force.Exciting force hammer main composition comprise power sensor, hammer body, counterweight and protection body, the power installation of sensors of traditional exciting force hammer is before the hammer body, counterweight is installed in after the hammer body, needs to arrange protection body before the power sensor.Protection body is tup or rubber blanket normally.Tradition exciting force hammer very easily causes the damage of power sensor when exciting force is excessive, be not suitable for the mode test of large-sized structural parts.
Summary of the invention
The object of the present invention is to provide a kind of excessive and large-sized structural parts mode test exciting bank of damageability sensor of large-sized structural parts exciting force of can avoiding knocking.
The object of the present invention is achieved like this:
Comprise power sensor, hammer body and counterweight, described power installation of sensors is after the hammer body, and counterweight is installed in after the power sensor.
The present invention can also comprise:
1, hammer is equipped with tup with it with handle before the hammer body.
2, the hammer body is installed on the hawser of crane.
The present invention be directed to mode testing method commonly used such as power and hammer the deficiency of the testing large structural member mode such as method, vibrator method into shape; a kind of mode test and excitation device of measuring large-sized structural parts has been proposed; this device has played certain protective effect to the power sensor, can avoid again knocking the excessive and damageability sensor of large-sized structural parts exciting force.
Description of drawings
Fig. 1 is the structural representation of conventional power hammer.
Fig. 2 is the structural representation of the first embodiment of the present invention.
Fig. 3 is the structural representation of the second embodiment of the present invention.
Embodiment
For example the present invention is done more detailed description below in conjunction with accompanying drawing.
In conjunction with Fig. 2, the structure of the first embodiment of the present invention forms and comprises power sensor 2, hammer body 3 and counterweight 1, and the power installation of sensors is after the hammer body, and counterweight is installed in after the power sensor.Hammer is equipped with tup 4 with it with handle before the hammer body.
Present embodiment is a kind of reverse assembly force hammer that proposes according to traditional exciting force hammer, this power hammer mainly is comprised of tup, power sensor, hammer body, counterweight four parts, can select according to the requirement of large-sized structural parts mode test frequency the tup of unlike material, the erection sequence of tradition exciting force hammer is followed successively by tup, power sensor, hammer body, counterweight, and oppositely the erection sequence of assembly force hammer is followed successively by tup, hammer body, power sensor, counterweight.That this embodiment has is simple to operate, advantage fast; when measuring large-sized structural parts mode; need very large exciting force; if select conventional power hammer; then the power sensor is subject to passing large that the force signal come can be very by tup; being easy to a power sensor damages; if but adopt reverse assembly force hammer; what this moment, the power sensor was subject to is the inertial force that is produced by counterweight; the power that this inertial force and tup are subject to is directly proportional; can not affect test result, but it is little a lot of obviously to pass the power of coming than tup, thereby the power sensor has been played protective effect.The signal that can obtain by observation test, thus the size of regulating as required counterweight reaches the purpose of regulating the input signal size.
In conjunction with Fig. 3, the structure of the second embodiment of the present invention forms and comprises power sensor 2, hammer body 3 and counterweight 1, and the power installation of sensors is after the hammer body, and counterweight is installed in after the power sensor.The hammer body is installed on the hawser of crane 5.
This embodiment mainly adopts crane, power sensor, the iron block as the hammer body, counterweight four parts composition, is in the iron block back, after counterweight is installed in the power sensor equally the power installation of sensors.
This embodiment is for first kind of way; do not need the people to climb to very high place and go operation; thereby can avoid certain Personal Risk, and also can regulate very easily the size of percussion power, this mode also can play a very good protection to the power sensor equally.By crane an iron block certain height of slinging, then the people stands in the position away from the iron block below, by drawing the hawser of hanging iron block, control the deflection angle of iron block, thereby can control the impingement position of iron block, can also control by the length of control rope the size of impact, the back side of iron block is installing force sensor, counterweight successively.The size that can regulate input signal according to the size of regulating counterweight equally.
To certain large-scale single cylinder diesel, use respectively conventional power hammer and reverse assembly force hammer dual mode to carry out the mode test, by the frequency response function curve that records, can compare the difference of this dual mode gained natural frequency.Measurement result shows, the result that two kinds of power hammer mounting meanss obtain is basically identical, so oppositely the assembly force hammer natural frequency that records test specimen is correct.
Claims (3)
1. exciting bank is used in a large-sized structural parts mode test, comprises power sensor, hammer body and counterweight, and it is characterized in that: described power installation of sensors is after the hammer body, and counterweight is installed in after the power sensor.
2. exciting bank is used in large-sized structural parts mode test according to claim 1, it is characterized in that: hammer is equipped with tup with it with handle before the hammer body.
3. exciting bank is used in large-sized structural parts mode test according to claim 1, and it is characterized in that: the hammer body is installed on the hawser of crane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310181904.4A CN103308263B (en) | 2013-05-16 | 2013-05-16 | Large-sized structural parts mould measurement exciting bank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310181904.4A CN103308263B (en) | 2013-05-16 | 2013-05-16 | Large-sized structural parts mould measurement exciting bank |
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| CN103308263A true CN103308263A (en) | 2013-09-18 |
| CN103308263B CN103308263B (en) | 2016-03-09 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132791A (en) * | 2014-07-17 | 2014-11-05 | 浙江工业大学 | Operation mode analysis experiment method and device based on pulse excitation |
| CN105067213A (en) * | 2015-07-16 | 2015-11-18 | 北京强度环境研究所 | Large-scale structure vibration characteristic test pulse excitation apparatus and application method thereof |
| CN105547618A (en) * | 2015-12-03 | 2016-05-04 | 北京机械设备研究所 | Modal analysis method based on folding control surface rudder system |
| CN106017832A (en) * | 2016-05-11 | 2016-10-12 | 东华大学 | Mode testing apparatus for plate-shaped part |
| CN106124144A (en) * | 2016-06-15 | 2016-11-16 | 中国科学院光电研究院 | A kind of aerostatics mode testing method and system |
| CN108132130A (en) * | 2017-12-25 | 2018-06-08 | 东北大学 | A kind of full-automatic modal forces hammer and method for Modal Test test |
| CN109323831A (en) * | 2018-09-05 | 2019-02-12 | 哈尔滨工程大学 | A kind of elongate rotation shaft modal test device discharging advocate approach suddenly based on preload |
| CN110243938A (en) * | 2019-06-26 | 2019-09-17 | 中国空气动力研究与发展中心高速空气动力研究所 | A kind of shifting power hammer modal test apparatus and system |
| CN115389147A (en) * | 2022-09-22 | 2022-11-25 | 哈尔滨工程大学 | Trigger type force hammer device suitable for various test environments |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132791A (en) * | 2014-07-17 | 2014-11-05 | 浙江工业大学 | Operation mode analysis experiment method and device based on pulse excitation |
| CN104132791B (en) * | 2014-07-17 | 2016-09-14 | 浙江工业大学 | A kind of operational modal analysis experimental technique based on pulse excitation |
| CN105067213A (en) * | 2015-07-16 | 2015-11-18 | 北京强度环境研究所 | Large-scale structure vibration characteristic test pulse excitation apparatus and application method thereof |
| CN105067213B (en) * | 2015-07-16 | 2019-02-26 | 北京强度环境研究所 | A kind of large scale structure test of Vibration pulse excitation device and its application method |
| CN105547618B (en) * | 2015-12-03 | 2018-02-13 | 北京机械设备研究所 | A kind of modal analysis method based on folding rudder face rudder system |
| CN105547618A (en) * | 2015-12-03 | 2016-05-04 | 北京机械设备研究所 | Modal analysis method based on folding control surface rudder system |
| CN106017832A (en) * | 2016-05-11 | 2016-10-12 | 东华大学 | Mode testing apparatus for plate-shaped part |
| CN106017832B (en) * | 2016-05-11 | 2018-06-22 | 东华大学 | A kind of plate part mould measurement device |
| CN106124144A (en) * | 2016-06-15 | 2016-11-16 | 中国科学院光电研究院 | A kind of aerostatics mode testing method and system |
| CN108132130A (en) * | 2017-12-25 | 2018-06-08 | 东北大学 | A kind of full-automatic modal forces hammer and method for Modal Test test |
| CN108132130B (en) * | 2017-12-25 | 2019-07-12 | 东北大学 | A kind of full-automatic modal forces hammer and method for Modal Test test |
| CN109323831A (en) * | 2018-09-05 | 2019-02-12 | 哈尔滨工程大学 | A kind of elongate rotation shaft modal test device discharging advocate approach suddenly based on preload |
| CN110243938A (en) * | 2019-06-26 | 2019-09-17 | 中国空气动力研究与发展中心高速空气动力研究所 | A kind of shifting power hammer modal test apparatus and system |
| CN115389147A (en) * | 2022-09-22 | 2022-11-25 | 哈尔滨工程大学 | Trigger type force hammer device suitable for various test environments |
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| CN103308263B (en) | 2016-03-09 |
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Inventor after: Li Wanyou Inventor after: Zhang Wenjun Inventor after: Sun Dan Inventor after: Zhang Xiangyuan Inventor after: Guo Yibin Inventor after: Frank Zhi jun Inventor after: Lu Xiqun Inventor after: Yu Shuwen Inventor after: Hu Yunbo Inventor after: Zhen Zhen Inventor after: Zhang Yue Inventor before: Li Wanyou Inventor before: Zhang Xiangyuan Inventor before: Sun Dan Inventor before: Guo Yibin Inventor before: Frank Zhi jun Inventor before: Lu Xiqun Inventor before: Yu Shuwen Inventor before: Hu Yunbo Inventor before: Zhen Zhen Inventor before: Zhang Yue Inventor before: Zhang Wenjun |