CN201352170Y - Improved high thrust vibration table system - Google Patents
Improved high thrust vibration table system Download PDFInfo
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- CN201352170Y CN201352170Y CNU2008201780119U CN200820178011U CN201352170Y CN 201352170 Y CN201352170 Y CN 201352170Y CN U2008201780119 U CNU2008201780119 U CN U2008201780119U CN 200820178011 U CN200820178011 U CN 200820178011U CN 201352170 Y CN201352170 Y CN 201352170Y
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Abstract
The utility model relates to an improved high thrust vibration table system, which comprises a vibration table body, a base, trunnions, two reinforcing rib plates which are symmetrically arranged on two sides of the top of the vibration table body, a lower supporting mechanism and a top pressing mechanism. The vibration table body is fixed on the trunnions on two sides of the table body and is rigidly connected; the reinforcing rib plates are of a 90-degree right angle shape; vertical right-angle sides are lapped on the trunnions; and horizontal right-angle sides are lapped on an upper cover of the vibration table body and fixed with the vibration table body by the top pressing mechanism. The utility model provides a proposal that a fastening part is additionally arranged outside the vibration table body to enhance the restriction on the vibration table body without processing and detaching the vibration table body, thereby improving the inherent frequency of a vibration table system.
Description
Technical field
The utility model relates to a kind of satellite test and uses the high thrust shaking table system, refers more particularly to the improvement of shaking table system dynamics.
Background technology
The high thrust shaking table system is one of present large-scale mechanical environment vibration rig of China, and whole the introduction is widely used in the mechanics vibration test of large-scale satellite and aircraft.Based on the influence of vibration environment to satellite structure and satellite equipment equipment thereof, in order to ensure satellites transmits success and energy operate as normal, the high thrust shaking table system can reproduce the vibration environment that satellite is stood on the ground in ground transport and emission flight course, stand the ability of this environment with test satellite and satellite equipment equipment thereof.In the satellite vibration test, passing of satelline test fixture is connected with vibration table (horizontal sliding table and expansion table top), and vibration table is connected with the vibration stage body, connects and all adopts screw connecting mode.
In the high thrust shaking table system, shaking table stage body and gudgeon pedestal adopt and are rigidly connected, and satisfy whole ship vibration test 2Hz lower frequency limit requirement.But gudgeon pedestal natural frequency is between 50～60Hz, and this frequency range also is the frequency range of eastern three platform satellite structure master modes.In adopting the process of eastern three platform tests, " Big Dipper F1 " satellite finds, the celestial body first natural frequency is close with shaking table gudgeon pedestal first natural frequency and vibration coupling takes place, cause beat frequency oscillator (the low frequency string shakes), cause the fracture of satellite antenna feed bar, and bring difficulty for test control.Simultaneously, if resonance effect appears in shaking table gudgeon pedestal separately in the low frequency section, the homogeneity of the net synchronization capability and the expansion table top of shaking table will be influenced directly.
Because shaking table combined system natural frequency can not satisfy the requirement of satellite sine sweep test, therefore, need carry out the calculating and the analysis of experiments of dynamics to shaking table system, stage body is carried out structure of modification, improve the natural frequency of shaking table gudgeon base systems, avoid occurring shaking table gudgeon pedestal and satellite coupled vibrations.
Have only 28 tons of two shaking tables (LDS984) of LDS company of Britain to carry out similar transformation abroad, but the design proposal difference, LDS company has carried out big structure of modification to the vibration stage body.But, high thrust shaking table system compact conformation is bulky, available space is very narrow and small, shaking table is connecting a large amount of leads such as water, oil, electricity, conduit, the dismounting shaking table carries out machining hardly may, the barrel of shaking table is an imported materials and items, and mechanical processing difficulty is big, and general drill bit can't punch.The model test plan of whole simultaneously ship, whole star, the big parts of star ship is very full, does not allow long-time the shut-down to transform.
Introduce the initial stage at this equipment, once carried out transformation, natural frequency has been improved near one times.Carrying out the second time again transforms, feasible design proposal seldom, as design and improperly will bring negative interaction, shaking table system itself is carried out machining, boring, welding etc., can destroy the integrality of shaking table, and the accuracy between the shaking table system very high (tolerance clearance between structure and the structure requires in 0.1mm), if shaking table will bring bad consequence because of processing produces distortion.Therefore determine that thorough modification scheme is very important.
Summary of the invention
The utility model provides one shaking table itself not to be carried out any processing and dismounting, and takes to add secure component by the outside, increases the constraint of shaking table, thereby improves the improved high thrust shaking table scheme of shaking table system natural frequency.
Of the present utility model can finishing by following technical scheme:
Improved high thrust shaking table system, involving vibrations stage body, two pedestals that are distributed in the stage body both sides and two gudgeons, be symmetrically distributed in two of vibration both sides, stage body top and strengthen gusset, lower support mechanism and top hold-down mechanisms, gudgeon is positioned at pedestal top, and be welded as a whole with pedestal, the vibration stage body is fixed on the gudgeon of stage body both sides, and employing is rigidly connected, strengthen the shape that gusset is 90 degree right angles, vertical right-angle side is overlapped on the gudgeon, the right-angle side of level be overlapped on the vibration stage body on cover, fix with vibrating stage body with the top hold-down mechanism.
Wherein, strengthen the vertical right-angle side of gusset with uniform fastening being overlapped on the gudgeon of the screw of four M20.
Wherein, the top hold-down mechanism with the screw of five M18 as thimble with the right-angle side of level be overlapped on the vibration stage body on cover, in the screw bottom steel shim is housed, be supported on the top surface of vibration stage body, screw is selected closely-pitched for use, regulates to compress the vibration stage body.
Wherein, the thickness of reinforcement gusset is 100mm.
Wherein, lower support mechanism adopts vertical hydraulic jack to support, and tensimeter is housed at the fulcrum of four correspondences of vibration stage body bottom.
The utility model utilizes experimental formula derivation and Nastran finite element method (fem) analysis to estimate to structural design in design process, optimal design, and main process of calculation analysis is as follows:
1, utilizes the estimation of experimental formula to the Scheme of Strengthening natural frequency.
The bracing means of this scheme is reduced to three models, i.e. lifting jack support section, reinforcement gusset and stage body loam cake coupling part and reinforcement gusset and pedestal coupling part under the stage body.Calculate fundamental frequency separately respectively, estimate the fundamental frequency of whole reinforcing section then with the formula of cascade system.
The result of estimation is 77Hz, and itself and the two shaking table system measured value 84Hz contrasts of reinforcing back 40T have illustrated that the estimation result is believable relatively.
2, utilize the estimation of finite element to the Scheme of Strengthening natural frequency
Utilize the Nastran finite element analysis software that the separate unit system is carried out model analysis.The first natural frequency of unguyed state is 60.759Hz (along continuous straight runs reverses), and the first natural frequency of reinforcing state is 89.93Hz.From test findings, the data of finite element analysis and experimental test data are approaching.
Its beneficial effect of the utility model is:
A. Scheme of Strengthening is not carried out any processing and dismounting to shaking table itself, and system is simple, small scale, and existing systems is not required extensive change, is easy to realize.For country has saved a large amount of research fundings, consolidation effect is better than international similar project, for the characteristic optimizing technological transformation of equipment has both at home and abroad proposed new approaches.
B. test data shows that gudgeon pedestal natural frequency improves 10～20Hz after reinforcing shaking table, successfully shaking table system and satellite structure first natural frequency are staggered, avoid occurring the vibration coupling of shaking table system and satellite, control curve homogeneity obviously improves, the control effect is obviously improved, and the coupled vibrations response of satellite structure significantly descends.Make simultaneously to be controlled in the range of tolerable variance, satisfy the requirement of charter, successfully solve the gordian technique difficult problem of overproof this large-scale mechanics vibration test of control.
Description of drawings
Fig. 1 is improved high thrust shaking table system synoptic diagram.
Fig. 2 is a Big Dipper F1 satellite mechanics vibration test control curve.
Fig. 3 is a Big Dipper F3 satellite mechanics vibration test control curve.
Wherein, 1 is the vibration stage body, and 2 is pedestal, and 3 for strengthening gusset, and 4 is lower support mechanism, and 5 is the top hold-down mechanism, and 6 is gudgeon.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated.
Improved high thrust shaking table system, is distributed in two pedestals 2 and two gudgeons 6 of vibration stage body 1 both sides at involving vibrations stage body 1.Gudgeon 6 is positioned at the top of pedestal 2, and is welded as a whole with pedestal 2.Vibration stage body 1 is a cylindrical tube that diameter is 1110mm, and vibration stage body 1 is fixed on the gudgeon of stage body both sides, and employing is rigidly connected.System also comprises two reinforcements gusset 3, lower support mechanism 4 and top hold-down mechanisms 5 that are symmetrically distributed in vibration both sides, stage body 1 top.Strengthen the shape that gusset 3 is 90 degree right angle flaps, thickness of slab 100mm is processed by the 45# steel, vertical right-angle side is overlapped on the gudgeon 6, uniform fastening with the screw of 4 M20, the right-angle side of level is overlapped on the loam cake of vibration stage body 1, and is fixing with vibration stage body 1 with top hold-down mechanism 5.The screw of five M18 of top hold-down mechanism 5 usefulness is as thimble, and screw is selected closely-pitched for use, regulates to compress the vibration stage body, is the protection stage body, in the screw bottom steel shim is housed, and is supported on the top surface of vibration stage body 1.For the balance that guarantees that shaking table is stressed, lower support mechanism 4 is at the fulcrum of four correspondences of vibration stage body 1 bottom, adopt vertical hydraulic jack (10t) to support, and tensimeter is housed, in order to controlled pressure in test, the shaking table structure is not being produced under the prerequisite of change like this, and playing the effect that increases the shaking table constraint.
The bottom of vibration stage body does not take the reason of reinforcement plate member to be, the space of stage body bottom is too little, its transmission case, valve, pipeline etc. are covered with in the stage body bottom, simultaneously, even certain space is arranged, the reinforcement plate member is changeed vertically in vibration stage body level, need dismounting during vertically commentaries on classics level, considers the weight and the installing space of reinforcement plate member, the unloading process difficulty is bigger than normal, so adopt the supporting way of hydraulic jack in the bottom.
The pedestal of shaking table both sides is domestic processing, and material is the A3 steel, and difficulty of processing is little, can carry out at the scene.
Two shaking table systems of east three platforms (each one in north side and southern side) all can improve according to such scheme.
Gudgeon pedestal natural frequency before shaking table is reinforced is between 50～60Hz, and the actual measurement first natural frequency of north side shaking table gudgeon pedestal is 60Hz; Reinforcing the back first natural frequency is 84Hz, has improved 24Hz.Can find out that from the test figure of Fig. 2 and Fig. 3 during " Big Dipper F1 " test, because shaking table is unguyed, satellite and the coupling of shaking table resonant frequency are big, produce beat frequency oscillator.After shaking table was reinforced, two system resonance frequencies staggered, and coupling diminishes, and the control effect is clearly better.Contrast the response change of storage tank flange on the satellite bearing cylinder+Z position measuring point again.Because after reinforcing, the control effect obviously improves, the quality of control simultaneously directly influences the response of satellite structure; The measuring point of " Big Dipper F3 " response also improves as can be seen in frequency 40～60Hz scope.
In the test of " Big Dipper F3 ", show all that from vibration test field observation and test back data analysis the structural response magnitude is lower than " Big Dipper F1 " and " Big Dipper F2 ", think, reinforce relevant with stage body.The response magnitude of satellite structure is mainly seen the resonance region, and the resonance region is positioned at concave region, and the input of satellite is shaken grade response that has just determined satellite structure just." Big Dipper F1 " and " Big Dipper F2 " exists vertical fundamental frequency of satellite and stage body gudgeon pedestal fundamental frequency coupled problem, and serious reforming phenomena is arranged in the concave region, and it is higher on average to import the level of shaking.Before " Big Dipper F3 " test shaking table is reinforced, avoided the vertical fundamental frequency 50Hz of satellite in the test, reforming phenomena obviously improves." Big Dipper F1 " and " Big Dipper F3 " mechanics vibration test control curve among comparison diagram 2, Fig. 3, as can be seen from Figure 2, during " Big Dipper F1 " test, because the 40t shaking table is unguyed, satellite and the coupling of shaking table two resonant frequencies are big, produce beat frequency oscillator.As can be seen from Figure 3, after the 40t shaking table was reinforced, two resonant frequencies staggered, and coupling diminishes, and the control effect is clearly better.
At present, the dynamics optimisation technique of shaking table system has been successfully applied in the middle of the dynamics environment test of eastern three platforms series satellite, for succeeding in sending up of model contributes.The high thrust shaking table system carries out twice vibration test debugging in Dec, 2002 and in January, 2003 through strengthening reconstruction, satisfactorily finishes the vibration test of the whole star of eastern three platforms such as " Big Dipper ", " remarkable ability ", " flames of war ", " navigation of two generations " thereafter.
Although above embodiment of the present utility model has been given to describe in detail and explanation; but what should indicate is; we can carry out various equivalences to above-mentioned embodiment according to conception of the present utility model and change and modification; when the function that it produced does not exceed spiritual that instructions and accompanying drawing contain yet, all should be within protection domain of the present utility model.
Claims (5)
1, improved high thrust shaking table system, involving vibrations stage body (1), be distributed in two pedestals (2) and two gudgeons (6) of vibration stage body (1) both sides, strengthen gusset (3) for two that are symmetrically distributed in vibration stage body (1) both sides, top, lower support mechanism (4) and top hold-down mechanism (5), gudgeon (6) is positioned at pedestal (2) top, and be welded as a whole with pedestal (2), vibration stage body (1) is fixed on the gudgeon (6) of both sides, and employing is rigidly connected, it is characterized in that, strengthen the shape that gusset (3) is 90 degree right angles, vertical right-angle side is overlapped on the gudgeon (6), the right-angle side of level be overlapped on vibration stage body (1) on cover, fixing with top hold-down mechanism (5) with vibration stage body (1).
2, the system as claimed in claim 1 is characterized in that, strengthens the vertical right-angle side of gusset (3) with uniform fastening being overlapped on the gudgeon (6) of the screw of four M20.
3, the system as claimed in claim 1, it is characterized in that, top hold-down mechanism (5) with the screw of five M18 as thimble with the right-angle side of level be overlapped on vibration stage body (1) on cover, in the screw bottom steel shim is housed, be supported on the top surface of vibration stage body (1), screw is selected closely-pitched for use, regulates to compress vibration stage body (1).
As any described system among the claim 1-3, it is characterized in that 4, the thickness of strengthening gusset (3) is 100mm.
5, the system as claimed in claim 1 is characterized in that, lower support mechanism (4) adopts vertical hydraulic jack to support, and tensimeter is housed at the fulcrum of four correspondences of vibration stage body (1) bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201780119U CN201352170Y (en) | 2008-11-17 | 2008-11-17 | Improved high thrust vibration table system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201780119U CN201352170Y (en) | 2008-11-17 | 2008-11-17 | Improved high thrust vibration table system |
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| CN201352170Y true CN201352170Y (en) | 2009-11-25 |
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| CNU2008201780119U Expired - Fee Related CN201352170Y (en) | 2008-11-17 | 2008-11-17 | Improved high thrust vibration table system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103482088A (en) * | 2013-08-12 | 2014-01-01 | 上海卫星工程研究所 | Satellite micro-vibration test multi-point suspension system and design method thereof |
| CN104458179A (en) * | 2014-11-20 | 2015-03-25 | 北京卫星环境工程研究所 | Four-table shunt excitation perpendicular vibration test system with expansion table board |
| CN104551422A (en) * | 2014-11-17 | 2015-04-29 | 北京卫星环境工程研究所 | Welding process of large-sized magnesium alloy extending table |
| CN105562221A (en) * | 2016-03-07 | 2016-05-11 | 中国工程物理研究院总体工程研究所 | Large-mass test part mounting device on vibration centrifuge |
-
2008
- 2008-11-17 CN CNU2008201780119U patent/CN201352170Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103482088A (en) * | 2013-08-12 | 2014-01-01 | 上海卫星工程研究所 | Satellite micro-vibration test multi-point suspension system and design method thereof |
| CN104551422A (en) * | 2014-11-17 | 2015-04-29 | 北京卫星环境工程研究所 | Welding process of large-sized magnesium alloy extending table |
| CN104458179A (en) * | 2014-11-20 | 2015-03-25 | 北京卫星环境工程研究所 | Four-table shunt excitation perpendicular vibration test system with expansion table board |
| CN104458179B (en) * | 2014-11-20 | 2017-05-10 | 北京卫星环境工程研究所 | Four-table shunt excitation perpendicular vibration test system with expansion table board |
| CN105562221A (en) * | 2016-03-07 | 2016-05-11 | 中国工程物理研究院总体工程研究所 | Large-mass test part mounting device on vibration centrifuge |
| CN105562221B (en) * | 2016-03-07 | 2018-05-15 | 中国工程物理研究院总体工程研究所 | Big quality test part erecting device on vibrating centrifuge |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091125 Termination date: 20151117 |
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| EXPY | Termination of patent right or utility model |