CN106338398B - Shell activity powder column solid engines Modal Parameter Testing Methods - Google Patents
Shell activity powder column solid engines Modal Parameter Testing Methods Download PDFInfo
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- CN106338398B CN106338398B CN201610834297.0A CN201610834297A CN106338398B CN 106338398 B CN106338398 B CN 106338398B CN 201610834297 A CN201610834297 A CN 201610834297A CN 106338398 B CN106338398 B CN 106338398B
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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Abstract
The present invention proposes a kind of shell activity powder column solid engines Modal Parameter Testing Methods.This method step are as follows: use engine end axial excitation；Measuring point is uniformly distributed axially along quadrantal heading in engine；Disposable test whole transmission function；Utilize least square multifrequency domain method fitted modal parameter；In conjunction with vibration shape feature entirety sex determination mould measurement correctness.Test method of the present invention solves the technical problem that modal parameter in the modal parameters test of shell activity powder column tactics Small Solid Rocket Motor determines difficult rank, modal frequency poor repeatability and vibration shape mutability.
Description
Technical field
The invention belongs to solid engines modal test technique fields, and in particular to a kind of shell activity powder column solid engines
Modal Parameter Testing Methods.
Background technique
Modal test is the main path of testing experiment product dynamic characteristic.Usually it is applied to the certain excitation of testpieces
Power acquires the response on product, analyzes software by dedicated modal parameter, can obtain the dynamic characteristic parameter of product.But
When being related to specific testpieces, test method is respectively had any different again.Shell activity powder column tactics Small Solid Rocket Motor is one
The novel power device of kind of missile armament, including engine shell 16, from engine front head 9 to starting in engine shell 16
Machine rear head 13 is sequentially arranged with engine casting powder column or movable powder column 10, motor grain engaging portion 11, engine activity medicine
Column 12, engine jet pipe 14 are mounted on engine rear head 13, and 13 lateral surface of engine rear head is engine rear skirt end face
15,9 lateral surface of engine front head is engine front skirt end face 17；Start for such shell activity powder column tactics Small Solid
It for machine, is structurally characterized in that, motor body is very thin compared to common engine wall thickness, and thickness of shell is even less than 1 millimeter；
Secondly, conventional engine uses casting powder column, and the shell activity powder column tactics Small Solid Rocket Motor uses movable powder column,
Increase the complexity of mould measurement；Most importantly, due to movable powder column, which is affected by gravity, can generate certain deformation, thus
Different quadrants are shown to modal parameter there is different influences, and two modal testing results show to have to gravity certain related
Property.Based on the above feature of shell activity powder column tactics Small Solid Rocket Motor, need that corresponding mould measurement technology is taken to arrange
It applies to overcome the testpieces to adversely affect to mould measurement bring.
Summary of the invention
A kind of shell activity powder column solid engines mould is provided it is an object of the invention to solve above-mentioned technical problem
State parameter test method, the modal parameters test to solve shell activity powder column tactics Small Solid Rocket Motor occur in the process
The mode result vibration shape is unstable, mould measurement function spreads big and movable powder column bring modal parameter and is affected by gravity survey
The technical problems such as test result poor repeatability.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of shell activity powder column solid engines Modal Parameter Testing Methods, comprising steps of
1) shell activity powder column solid engines elastic string hung using exciting force hammer skirt end excitation axially back and forth；
2) it is uniformly distributed multi-turn response measuring point along axial quadrantal heading in the shell activity powder column solid engines, multi-turn is rung
Answer the arrangement of measuring point that should can show the mode of flexural vibration and Breathing mode of the shell activity powder column solid engines；
3) the test transmission function of disposable test whole measuring point, and make to test the high coherence of transmission function holding；
4) on the basis of all testing transmission function, using least square multifrequency domain method fitted modal parameter, mould is obtained
State parametric results；
5) correctness of Mode Shape feature entirety sex determination modal parameters test result is utilized.
Wherein, the response measuring point is 8 circles.
During the test, if it is incorrect using Mode Shape feature entirety sex determination modal parameters test result, into
Row following steps:
Whether the parameter setting of investigation test sensor first is correct, and secondly whether the connection of detection measurement circuit is normal, so
Afterwards again by step 1) -5) the step of test, until Mode Shape feature shows globality.
Wherein, detect it is described test sensor parameter setting whether correctly include detection test sensor sensitivity and
Direction definition.
Wherein, the mode of flexural vibration includes first three rank mode of flexural vibration, and the Breathing mode includes single order Breathing mode.
The suspension frequency of the shell activity powder column solid engines is less than shell activity powder column solid engines First-Order Mode
The 1/3 of state frequency.
The present invention can be effectively reduced influence of the power hammer excitation to test result, improve mode test result stability,
It solves modal parameter in the modal parameters test of shell activity powder column tactics Small Solid Rocket Motor and determines rank difficulty, modal frequency
The technical problem of poor repeatability and vibration shape mutability, and this method has stronger operability and practicability.
Detailed description of the invention
Fig. 1 is shell activity powder column tactics Small Solid Rocket Motor structural schematic diagram involved by the present invention；
Fig. 2 is modal test test system structure figure according to the present invention；
In figure: 1. exciting forces hammer, 2. data acquisition equipments, 3. instrument table tops, 4. modal analysis systems, 5. shell moving medicines
Column solid engines, 6. elastic strings, 7. test sensors, 8. p-wires.
Specific embodiment
In the following, in conjunction with example, property feature and advantage is further described for the essence of the present invention, but the present invention not office
It is limited to listed embodiment.
Shell activity powder column tactics Small Solid Rocket Motor modal parameters test system shown in Figure 2, of the invention, packet
Exciting force hammer 1, data acquisition equipment 2 are included, modal analysis system 4 tests sensor 7, p-wire 8；Modal analysis system 4 and number
According to acquisition 2 signal of equipment connection, data acquisition equipment 2 is connect by p-wire 8 with test 7 signal of sensor, and data acquisition is set
Standby 2 connect with exciting force hammer 1.Data acquisition equipment 2, modal analysis system 4 are mounted on instrument table top 3, shell to be tested
Movable powder column solid engines 5 are hung in the sky with elastic string 6.
The exciting force hammer 1, data acquisition equipment 2, modal analysis system 4, elastic string 6, test sensor 7 and p-wire
8, can market purchase it is mating, form complete set modal test test macro.
Suitable elastic string 6 is selected according to the quality of shell activity powder column tactics Small Solid Rocket Motor, so that shell is living
The suspension frequency of dynamic powder column solid engines is less than the 1/3 of shell activity powder column solid engines first-order modal frequency.Installation is surveyed
It tries sensor 7 and connecting test line 8 is to data acquisition equipment 2, connect exciting force hammer 1 to data acquisition equipment 2.
Test macro is debugged, correlation test parameter is set, modal test test macro is made to be in state to be tried.Then it uses
Following steps are tested:
1) axial excitation is carried out using exciting force hammer, excitation position is skirt end axis before and after shell activity powder column solid motivation
To；
2) shell activity powder column solid engines (i.e. shell activity powder column tactics Small Solid Rocket Motor) along axial direction as
Limit direction is uniformly distributed 8 circles response measuring point；Measuring point is disposed with the bending for being conducive to show shell activity powder column solid engines
Mode and Breathing mode；
Due to being influenced by solid rocket motor grain damping characteristic, the vibration high order mode vibration of measuring point response declines rapidly
Subtract, general point layout will be conducive to show first three rank mode of flexural vibration and single order Breathing mode.
3) disposable test whole transmission function, and ensure the high coherence of whole transmission functions；
In test process, the coherence of observation test transmission function is paid attention to, according to preset high relevant by requirement of experiment
Sex determination rule, replaces the measuring point sensor of coherence's difference in time, keeps the measuring point sensor of high coherence, or transmit according to examination
Function coherence instruction, is discharged test failure；The test transmission function that once test all response points, as TCH test channel limits
System must at least meet primary test all response measuring point radial transducer direction measuring points of shell activity powder column solid engines.
4) on the basis of all testing transmission function, using least square multifrequency domain method fitted modal parameter, mould is obtained
State parametric results；
Due to there is movable powder column, the modal parameter result form of expression of shell activity powder column tactics Small Solid Rocket Motor
Therefore the least square multifrequency domain method recognition methods with complex mode feature recognition capability is selected to be fitted mould for complex mode form
State parameter obtains modal parameter result.
5) correctness of Mode Shape feature entirety sex determination mode test result, i.e. mode test result are combined whether just
Really.
Since mould measurement vibration shape result should show the overall permanence of engine, Mode Shape globality need to be made
For judge shell activity powder column tactics Small Solid Rocket Motor modal parameters test quality main foundation.Mode Shape is whole
Property refer to Mode Shape not and allow jump, the abnormal especially exciting force hammer excitation position vibration shape of the partial points vibration shape it is abnormal, basis
The globality of Mode Shape judges whether to need to repeat 1) -5) test process of step.
It is abnormal such as to occur the performance of the measuring point vibration shape during the test, i.e. the non-integral property vibration shape.Test sensing must be checked first
Whether device parameter setting, including sensitivity, direction definition are correct, and whether normal, including test if secondly detecting measurement circuit connection
The loosening and breakage of connector.It is retested after rejecting abnormalities point, until Mode Shape feature shows globality.
In step 1) -5) after each step of step implements to require all correct implement, it can be obtained accurate shell moving medicine
Column tactics solid engines modal parameter.
The Mode Shape feature shows globality or the non-integral property, can be according to the preset mode by requirement of experiment
The globality of vibration shape feature or the non-integral property judgment rule judge, how this specification is to judging no longer to illustrate.
First advantage of test method of the present invention is, since shell engine radial rigidity is small, is swashed using axial end portion
It encourages and avoids the big disadvantage of radial excitation interference.Biggish non-linear effects can be brought if using radial excitation, are directly resulted in
The variability of the test result vibration shape determines rank judgement to mode and causes difficulty；Motor grain is movable part simultaneously, different
Radial quadrant excitation will cause the distribution of pressure caused by powder column gravity and change, causes the poor repeatability of test result, use
Axial end portion excitation can avoid interference powder column weight distribution occur, ensure that the repeatability of mode test result.
Second major advantage of test method of the present invention is to judge mode test result just using vibration shape global feature
It is of low quality and finish mould measurement to avoid test result for true property.Since modal parameters test may be repeated, such as
What judges that mould measurement correctness is the key that mould measurement.Test method of the present invention, which provides, judges shell activity powder column tactics
The whether correct method of the modal parameters test result of Small Solid Rocket Motor.
Test method of the present invention solves mould in the modal parameters test of shell activity powder column tactics Small Solid Rocket Motor
State parameter determines the technical problem of difficult rank, modal frequency poor repeatability and vibration shape mutability.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. shell activity powder column solid engines Modal Parameter Testing Methods, which comprises the following steps:
1) shell activity powder column solid engines elastic string hung using exciting force hammer skirt end excitation axially back and forth；
2) it is uniformly distributed multi-turn response measuring point along axial quadrantal heading in the shell activity powder column solid engines, multi-turn response is surveyed
The arrangement of point should can show the mode of flexural vibration and Breathing mode of the shell activity powder column solid engines；
3) the test transmission function of disposable test whole measuring point, and make to test the high coherence of transmission function holding；
4) on the basis of all testing transmission function, using least square multifrequency domain method fitted modal parameter, mode ginseng is obtained
Number result；
5) correctness of Mode Shape feature entirety sex determination modal parameters test result is utilized.
2. shell activity powder column solid engines Modal Parameter Testing Methods according to claim 1, which is characterized in that described
Responding measuring point is 8 circles.
3. shell activity powder column solid engines Modal Parameter Testing Methods according to claim 1 or claim 2, which is characterized in that
If incorrect using Mode Shape feature entirety sex determination modal parameters test result, follow the steps below: investigation is surveyed first
Whether the parameter setting for trying sensor is correct, secondly detects whether measurement circuit connection is normal, then presses step 1) -5 again)
Step test, until Mode Shape feature shows globality.
4. shell activity powder column solid engines Modal Parameter Testing Methods according to claim 3, which is characterized in that detection
Whether the parameter setting of the test sensor correctly includes the sensitivity and direction definition for detecting test sensor.
5. shell activity powder column solid engines Modal Parameter Testing Methods according to claim 1, which is characterized in that described
Mode of flexural vibration includes first three rank mode of flexural vibration, and the Breathing mode includes single order Breathing mode.
6. shell activity powder column solid engines Modal Parameter Testing Methods according to claim 1, which is characterized in that described
The suspension frequency of shell activity powder column solid engines is less than the 1/3 of shell activity powder column solid engines first-order modal frequency.
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| CN107388907A (en) * | 2017-08-22 | 2017-11-24 | 天津航天瑞莱科技有限公司 | A kind of Free Modal pilot system under guided missile autorotation |
| CN111591408B (en) * | 2020-06-18 | 2021-05-28 | 中国船舶科学研究中心 | Real-scale marine propeller vibration mode measurement method |
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| EP2565444A1 (en) * | 2011-08-31 | 2013-03-06 | Wölfel Beratende Ingenieure GmbH & Co. KG | Method and device for monitoring the status of rotor blades |
| CN105424797A (en) * | 2015-11-05 | 2016-03-23 | 北京航空航天大学 | Device and method for performing modal testing on inflatable flexible film structure based on hammering excitation method |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1955750A (en) * | 2005-10-24 | 2007-05-02 | 信息产业部电子第五研究所 | Modal checking method and system of vacuum electronic device |
| CN1978977A (en) * | 2006-12-01 | 2007-06-13 | 北京工业大学 | Supersonic guide-wave time reversion detection apparatus and method for defect of pipeline |
| CN102135466A (en) * | 2010-11-18 | 2011-07-27 | 西安航空动力股份有限公司 | Method for testing vibration mode |
| EP2565444A1 (en) * | 2011-08-31 | 2013-03-06 | Wölfel Beratende Ingenieure GmbH & Co. KG | Method and device for monitoring the status of rotor blades |
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