CN106338398A - Thin shell movable powder pellet solid engine modal parameter test method - Google Patents
Thin shell movable powder pellet solid engine modal parameter test method Download PDFInfo
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- CN106338398A CN106338398A CN201610834297.0A CN201610834297A CN106338398A CN 106338398 A CN106338398 A CN 106338398A CN 201610834297 A CN201610834297 A CN 201610834297A CN 106338398 A CN106338398 A CN 106338398A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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 invention provides a thin shell movable powder pellet solid engine modal parameter test method. The method comprises a step of using engine end part axial excitation, a step of uniformly distributing measuring points at an engine axial direction along a quadrant direction, a step of testing all transfer functions in one time, a step of using a least square frequency domain method to fit a modal parameter, and a step of judging a modal test correctness in the whole with the combination of vibration characteristics. According to the test method, the technical problems of difficult modal parameter rank determination, poor modal frequency repeatability and easy change of a vibration type in the modal parameter test of the thin shell movable powder pellet tactical solid motor are solved.
Description
Technical field
The invention belongs to solid engines modal test technique field and in particular to a kind of shell activity powder column solid engines
Modal Parameter Testing Methods.
Background technology
Modal test is the main path of testing experiment product dynamic characteristic.Generally it is applied to the certain excitation of testpieces
Power, the response on collection product, by special modal parameter analysis software, it is possible to obtain the dynamic characteristic parameter of product.But
When being related to specific testpieces, its method of testing 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, includes electromotor shell 16, electromotor shell 16 interior from electromotor front head 9 to starting
Machine rear head 13 is sequentially arranged with electromotor casting powder column or movable powder column 10, motor grain joint portion 11, engine activity medicine
Post 12, engine jet pipe 14 is arranged on electromotor rear head 13, and electromotor rear head 13 lateral surface is electromotor rear skirt end face
15, electromotor front head 9 lateral surface is electromotor front skirt end face 17；Start for this kind of shell activity powder column tactics Small Solid
For machine, it is structurally characterized in that, it is very thin that common engine wall thickness compared by motor body, and thickness of shell is even less than 1 millimeter；
Next, conventional electromotor is using casting powder column, and this shell activity powder column tactics Small Solid Rocket Motor adopts movable powder column,
Increased the complexity of mould measurement；Most importantly, due to movable powder column is affected by gravity can produce certain deformation, thus
Different quadrants show and modal parameter are existed with different impacts, two modal testing results show to gravity have certain related
Property.Based on the above feature of shell activity powder column tactics Small Solid Rocket Motor, need to take corresponding mould measurement technology to arrange
Apply the adverse effect to overcome this testpieces to bring to mould measurement.
Content of the invention
It is an object of the invention to solving above-mentioned technical problem and providing a kind of shell activity powder column solid engines mould
State parameter test method, in order to solve shell activity powder column tactics Small Solid Rocket Motor modal parameters test during occur
The mode result vibration shape is unstable, mould measurement function spreads the modal parameter that big and movable powder column brings and is affected by gravity survey
The technical problems such as test result poor repeatability.
For achieving the above object, the present invention adopts the following technical scheme that
A kind of shell activity powder column solid engines Modal Parameter Testing Methods, including step:
1) using exciting force hammer to the shell activity powder column solid engines skirt end axially back and forth being hung using elastic string
Excitation；
2) quadrantal heading is uniformly distributed multi-turn response measuring point vertically to send out machine in this shell activity powder column solid, and multi-turn responds
The arrangement of measuring point should can be shown that mode of flexural vibration and the Breathing mode of this shell activity powder column solid engines；
3) the test transmission function of the whole measuring point of disposable test, and make test transmission function keep high coherence；
4) on the basis of whole test transmission functions, using least square multifrequency domain method fitted modal parameter, obtain mould
State parametric results；
5) utilize the correctness of Mode Shape feature entirety sex determination modal parameters test result.
Wherein, described response measuring point is 8 circles.
In test process, if incorrect using Mode Shape feature entirety sex determination modal parameters test result, enter
Row following steps:
Whether the parameter setting of investigation test sensor first is correct, secondly detects whether measurement circuit connects normal, so
Again press step 1 afterwards) -5) step test, until Mode Shape feature shows globality.
Wherein, the parameter setting of detection described test sensor whether correctly include detecting test sensor sensitivity and
Direction defines whether correctly.
Wherein, described mode of flexural vibration includes first three rank mode of flexural vibration, and described Breathing mode includes single order Breathing mode.
The suspension frequency of described 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 the impact to test result for the power hammer excitation, improve mode test result stability,
Solve modal parameter in the modal parameters test of shell activity powder column tactics Small Solid Rocket Motor and determine rank difficulty, model frequency
Poor repeatability and the technical barrier of vibration shape mutability, and the method has stronger operability and practicality.
Brief description
Fig. 1 is shell activity powder column tactics Small Solid Rocket Motor structural representation involved by the present invention；
Fig. 2 is modal test test system structure figure involved in the present invention；
In figure: 1. exciting force hammer, 2. data acquisition equipment, 3. instrument table top, 4. model analyses software system, 5. shell work
Dynamic powder column solid engines, 6. elastic string, 7. test sensor, 8. p-wire.
Specific embodiment
Below, in conjunction with example, the substantive distinguishing features of the present invention and advantage are further described, but the present invention not office
It is limited to listed embodiment.
Shown in Figure 2, the shell activity powder column tactics Small Solid Rocket Motor modal parameters test system of the present invention, bag
Include exciting force hammer 1, data acquisition equipment 2, modal analysis system 4, test sensor 7, p-wire 8；Modal analysis system 4 and number
Connect according to collecting device 2 signal, data acquisition equipment 2 is passed through p-wire 8 and is connected with test sensor 7 signal, and data acquisition sets
Standby 2 are connected with exciting force hammer 1.Data acquisition equipment 2, modal analysis system 4 are arranged on instrument table top 3, shell to be tested
Movable powder column solid engines 5 are hung in the air with elastic string 6.
Described exciting force hammer 1, data acquisition equipment 2, modal analysis system 4, elastic string 6, test sensor 7 and p-wire
8, all can buy supporting, composition complete set modal test test system in market.
Quality according to shell activity powder column tactics Small Solid Rocket Motor selects suitable elastic string 6 so that shell is lived
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.Install and survey
Simultaneously connecting test line 8, to data acquisition equipment 2, connects exciting force hammer 1 to data acquisition equipment 2 to examination sensor 7.
Debugging test system, arranges correlation test parameter, so that modal test test system is in and treat examination state.Then adopt
Following steps are tested:
1) axial excitation is carried out using exciting force hammer, excitation position is to send out skirt end before and after shell activity powder column solid motivation
Axially；
2) in shell activity powder column solid engines (i.e. shell activity powder column tactics Small Solid Rocket Motor) elephant vertically
Limit direction is uniformly distributed 8 circle response measuring points；Measuring point be disposed with beneficial to show shell activity powder column solid engines bending
Mode and Breathing mode；
Due to being affected 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 showing first three rank mode of flexural vibration and single order Breathing mode.
3) the whole transmission function of disposable test, and guarantee the high coherence of whole transmission functions；
In test process, note observing the coherence of test transmission function, default high relevant according to empirically requirement
Sex determination rule, changes the measuring point sensor of coherence's difference in time, keeps the measuring point sensor of high coherence, or according to examination transmission
Function coherence indicates, discharges test failure；Once to test the test transmission function of all response point, such as TCH test channel limit
System, at least must meet once test shell activity powder column solid engines all responses measuring point radial transducer direction measuring point.
4) on the basis of whole test transmission functions, using least square multifrequency domain method fitted modal parameter, obtain mould
State parametric results；
Due to presence activity powder column, the modal parameter result form of expression of shell activity powder column tactics Small Solid Rocket Motor
For complex mode form, therefore, select the least square multifrequency domain method recognition methodss matching mould with complex mode feature identification ability
State parameter, obtains modal parameter result.
5) combine the correctness of Mode Shape feature entirety sex determination mode test result, that is, whether just mode test result
Really.
Because mould measurement vibration shape result should show the overall permanence of electromotor, therefore need to make Mode Shape globality
For judging the Main Basiss of the modal parameters test quality of shell activity powder column tactics Small Solid Rocket Motor.Mode Shape is overall
Property refer to that Mode Shape does not allow saltus step, the partial points vibration shape abnormal especially exciting force hammer excitation position vibration shape abnormal, basis
The globality of Mode Shape judges whether to need to repeat 1) -5) test process of step.
The performance of the measuring point vibration shape such as occurs in test process abnormal, i.e. the non-integral property vibration shape.Test sensing must be investigated first
Device parameter setting, defines whether correctly including sensitivity, direction, and secondly normally whether detection measurement circuit connect, including test
Joint loosen and damaged.Retest after rejecting abnormalities point, until Mode Shape feature shows globality.
In step 1) -5) after each step of step implements to require all correct enforcement, you can obtain accurate shell moving medicine
Post tactics solid engines modal parameter.
Described Mode Shape feature shows globality or the non-integral property, can according to empirically require and default mode
Judging, how this specification is to judging no longer to illustrate for the globality of vibration shape feature or the non-integral property judgment rule.
First advantage of method of testing of the present invention is, because shell electromotor radial rigidity is little, is swashed using axial end portion
Encourage and avoid the radially big shortcoming of excitation interference.As larger non-linear effects then can be brought using radial direction excitation, directly result in
The polytropy of the test result vibration shape, determines rank to mode and judges to cause difficulty；Motor grain is movable part simultaneously, different
Radial direction quadrant encourages, and the pressure distribution that powder column gravity causes can be caused to change, cause the poor repeatability of test result, adopts
Axial end portion excitation can avoid the occurrence of interference powder column weight distribution, ensures that the repeatability of mode test result.
Second major advantage of method of testing of the present invention is to judge mode test result just using vibration shape global feature
True property, it is to avoid test result is of low quality and finish mould measurement.Because modal parameters test may be repeated, therefore such as
What judges that mould measurement correctness is the key of mould measurement.Method of testing of the present invention provides and judges shell activity powder column tactics
The whether correct method of the modal parameters test result of Small Solid Rocket Motor.
Method of testing of the present invention solves the modal parameters test middle mold of shell activity powder column tactics Small Solid Rocket Motor
State parameter determines the technical barrier of rank difficulty, model frequency poor repeatability and vibration shape mutability.
The above is only the preferred embodiment of the present invention it is noted that ordinary skill people for the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. shell activity powder column solid engines Modal Parameter Testing Methods are it is characterised in that comprise the following steps:
1) using exciting force hammer to the shell activity powder column solid engines skirt end excitation axially back and forth being hung using elastic string；
2) quadrantal heading is uniformly distributed multi-turn response measuring point vertically to send out machine in this shell activity powder column solid, and multi-turn responds measuring point
Arrangement should can be shown that mode of flexural vibration and the Breathing mode of this shell activity powder column solid engines；
3) the test transmission function of the whole measuring point of disposable test, and make test transmission function keep high coherence；
4) on the basis of whole test transmission functions, using least square multifrequency domain method fitted modal parameter, obtain mode ginseng
Number result；
5) utilize the correctness of Mode Shape feature entirety sex determination modal parameters test result.
2. according to claim 1 shell activity powder column solid engines Modal Parameter Testing Methods it is characterised in that described
Response measuring point is 8 circles.
3. shell according to claim 1 or claim 2 activity powder column solid engines Modal Parameter Testing Methods it is characterised 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 of examination sensor is correct, and secondly whether the connection of detection measurement circuit is normal, then again presses step 1) -5)
Step is tested, until Mode Shape feature shows globality.
4. according to claim 3 shell activity powder column solid engines Modal Parameter Testing Methods it is characterised in that detection
Whether the parameter setting of described test sensor correctly includes detecting that the sensitivity of test sensor and direction define whether correctly.
5. according to claim 1 shell activity powder column solid engines Modal Parameter Testing Methods it is characterised in that described
Mode of flexural vibration includes first three rank mode of flexural vibration, and described Breathing mode includes single order Breathing mode.
6. according to claim 1 shell activity powder column solid engines Modal Parameter Testing Methods it is characterised 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201610834297.0A CN106338398B (en) | 2016-09-20 | 2016-09-20 | Shell activity powder column solid engines Modal Parameter Testing Methods |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610834297.0A CN106338398B (en) | 2016-09-20 | 2016-09-20 | Shell activity powder column solid engines Modal Parameter Testing Methods |
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| CN106338398B CN106338398B (en) | 2019-04-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111591408A (en) * | 2020-06-18 | 2020-08-28 | 中国船舶科学研究中心 | Real-scale marine propeller vibration mode measurement method |
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| CN102494859A (en) * | 2011-11-15 | 2012-06-13 | 上海卫星工程研究所 | Fixed frequency calibration test method of spacecraft vibration |
| 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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2016
- 2016-09-20 CN CN201610834297.0A patent/CN106338398B/en active Active
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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111591408A (en) * | 2020-06-18 | 2020-08-28 | 中国船舶科学研究中心 | Real-scale marine propeller vibration mode measurement method |
| 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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| CN106338398B (en) | 2019-04-12 |
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