CN103323097B - A kind of ultralow frequency high-precision microvibration measuring system - Google Patents
A kind of ultralow frequency high-precision microvibration measuring system Download PDFInfo
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- CN103323097B CN103323097B CN201310244981.XA CN201310244981A CN103323097B CN 103323097 B CN103323097 B CN 103323097B CN 201310244981 A CN201310244981 A CN 201310244981A CN 103323097 B CN103323097 B CN 103323097B
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Abstract
A kind of ultralow frequency high-precision microvibration measuring system, is made up of base, four transfer blocks, four strain force sensors, loading disk, dynamic strain indicator, 48 foil gauges and Data collection and precessing system; Strain force sensor posts foil gauge; Strain force sensor, between loading disk and transfer block, is connected by bolt tightening; Transfer block is positioned at base side surface, to be tightened be connected by bolt with base side surface; By the foil gauge that four strain force sensors are pasted is carried out reasonable combination and and dynamic strain indicator connect to form 12 full-bridge circuits, measure three dynamic force and three dynamic force moments of disturbing source.Disturbing source had both been contained in test macro inside, also can be contained in test macro outside.Each foil gauge is connected with dynamic strain indicator by wire, and dynamic strain indicator is connected with Data collection and precessing system by wire; The present invention accurately can measure vibration force and the oscillatory torque in small sample perturbations source, and the frequency range of measurement is accurate to 0Hz, and Measurement reliability is high.
Description
Technical field
The present invention relates to a kind of ultralow frequency high-precision microvibration measuring system, can be used for carrying out kinetic measurement to the vibration signal of spacecraft inside tiny perturbation load on six-freedom degree.
Background technology
Current spacecraft all belongs to large-scale flexible expansion mechanism mostly, and with a large amount of optical elements, they all propose very high requirement to pointing accuracy and degree of stability.In addition, in modern spacecraft attitude control system, reaction wheel, single frame moment gyro and solar wing driving mechanism etc. are the critical elements in its control system, they are while the control power providing necessity, also some nuisance vibrations (for the sake of simplicity, above-mentioned three germlines being completely called disturbing source below) can be caused.These disturbances drive error etc. to cause primarily of flywheel imbalance, bearing disturbance, motor disturbance, motor, wherein motor disturbance is the main reason causing solar wing driving mechanism to vibrate, and the low frequency region situation of motor disturbance is complicated, these disturbing forces and disturbing moment can reduce the performance index of accuracy instrument in body space, therefore measure and analyze the dynamic perfromance of spacecraft useful load disturbance, for analyzing and eliminating disturbance thus improve the attitude control accuracy of spacecraft and strengthen the safe design of spacecraft and have very important engineering significance.
Because the disturbance of spacecraft disturbing source is very little, in space, three directions can only produce the faint disturbance of even a few milli newton of tens milli newton to indivedual useful load such as momenttum wheel, want to measure this type of disturbance in the ground experiment room with relatively strong jamming pattern noise very difficult, and the accuracy requirement of its respective sensor is very high.In addition, piezoelectric force transducer is lower in low frequency region degree of accuracy, can not meet the test request to the vibration of solar wing driving mechanism.
At present, there is not yet the reported in literature about this type of ultralow frequency microvibration measuring system both at home and abroad.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, a kind of ultralow frequency high-precision microvibration measuring system is provided, measure and analyze in spacecraft operational process, the dynamic perfromance of disturbing source on the six-freedom degree of space, overcome piezoelectric force transducer in the lower deficiency of low frequency region degree of accuracy, for the attitude control accuracy that improves spacecraft and the safe design of strengthening spacecraft provide reliable test data.
The present invention will solve the technical scheme that its technical matters adopts: a kind of ultralow frequency high-precision microvibration measuring system, its survey frequency can be low to moderate 0Hz, and the precision of its vibration force and oscillatory torque is better than 10 respectively
-3n and 10
-3nm, this measuring system comprises base 1, device for measuring force 2, dynamic strain indicator 3 and Data collection and precessing system 4, device for measuring force 2 is made up of four strain force sensors, 5, four transfer blocks 6, loading disk 7 and 48 foil gauges 11, four transfer blocks 6 lay respectively on four side surfaces of base 1, each transfer block 6 all by three bolt tightenings on the side surface of base 1, four strain force sensors 5 are between the upper surface and loading disk 7 lower surface of four transfer blocks 6, and each strain force sensor 5 is respectively by the upper surface of four bolt tightenings in transfer block 6 and the lower surface of loading disk 7, four strain force sensors 5 are all made up of three parts that shape is identical, wherein two parts are positioned in horizontal direction, another part is positioned on vertical direction, and every part all posts 4 foil gauges 11 at the planimetric position place that circular arc is corresponding, four foil gauges 11 of every part and dynamic strain indicator 3 form a full-bridge, full-bridge 8 in such formation two horizontal directions, 9 and vertical direction on full-bridge 10, full-bridge 8 in two horizontal directions, 9 guarantee to measure along the vibration force of Z axis with around X, the oscillatory torque of Y-axis, full-bridge 10 on vertical direction guarantees to measure along X, the vibration force of Y-axis and the oscillatory torque around Z axis, foil gauge 11 on four strain force sensors 5 is connected with dynamic strain indicator 3 by signal transmssion line, dynamic strain indicator 3 is exported and is connected with Data collection and precessing system 4 by signal transmssion line, when small sample perturbations source produces vibration, the full-bridge that foil gauge 11 on four strain force sensors 5 and dynamic strain indicator 3 form produces voltage signal, this voltage signal is converted into three microvibration force signals and three microvibration torque signals by Data collection and precessing system 4, and accurate analysis goes out the vibration characteristics in small sample perturbations source based on this.
Principle of the present invention is: the present invention includes base, four transfer blocks, four strain force sensors, 48 foil gauges, loading disk, dynamic strain indicator and Data collection and precessing system; Disturbing source is arranged on the center of loading disk, and the full-bridge that the foil gauge that the horizontal component of four strain force sensors is pasted and dynamic strain indicator form is for measuring the oscillatory torque of the vibration force of Z-direction and X, Y-direction; The full-bridge of the foil gauge that the vertical portion of four strain force sensors is pasted and dynamic strain indicator composition is for measuring X, the vibration force of Y-direction and the oscillatory torque of Z-direction; The foil gauge that four strain force sensors are pasted is connected with dynamic strain indicator by signal transmssion line; Dynamic strain indicator is exported and is connected with Data collection and precessing system by signal transmssion line; When small sample perturbations source produces vibration, the full-bridge that the foil gauge that four strain force sensors are pasted and dynamic strain indicator form produces voltage signal, this voltage signal is converted into three microvibration force signals and three microvibration torque signals by Data collection and precessing system, can go out the vibration characteristics in small sample perturbations source by accurate analysis based on this.
Four described transfer blocks are piece of stainless steel, and are distributed in symmetrically on four side surfaces of base.
Four described strain force sensors are aluminum element, and it posts foil gauge.
Four described strain force sensors lay respectively on the upper surface of four transfer blocks, and are distributed in symmetrically on loading disk lower surface, and are positioned at the edge of loading disk.
The shape of described loading disk is inner circle foreign side.
The side, four, top of described base is connected with four transfer blocks respectively; Bottom is connected with ground by 20 bolts.
The bolt at the described needs place of being bolted must be tightened in the scope of intensity permission as far as possible, to improve the rigidity of this measuring system, ensures its measuring accuracy.
Described measuring system inside is empty, disturbing source can be arranged on measuring system inside, also disturbing source can be arranged on measuring system outside.
The present invention compared with prior art has the following advantages:
(1) the present invention carries out reasonable Arrangement by the full-bridge formed the foil gauge that four common strain force sensors are pasted and dynamic strain indicator, thus make the micro-disturbance signal of six-freedom degree can utilize existing strain force sensor to measure, overcome the problem lacking high precision three-dimensional sensor, measuring accuracy is improved greatly.
(2) the present invention's application is strain force sensor, can overcome the deficiency that piezoelectric force transducer low frequency region degree of accuracy is lower.
(3) measurement mechanism of the present invention is separated with measured test specimen, does not need to install optional equipment and sensor on measured test specimen, does not affect the dynamic perfromance of test specimen, does not damage test specimen structure, and after test, test specimen can also normally use.
(4) disturbing source of the present invention can be placed in measuring system inside or outside, improves the adaptability of measuring system.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1;
Fig. 2 is device for measuring force schematic diagram in the embodiment of the present invention 1;
Fig. 3 is strain force sensor schematic diagram in the embodiment of the present invention 1;
Fig. 4 is full-bridge circuit schematic diagram in the embodiment of the present invention 1.
Embodiment
As shown in Figure 1, Figure 2 and Figure 3, a kind of ultralow frequency high-precision microvibration measuring system comprises: base 1, device for measuring force 2, dynamic strain indicator 3 and Data collection and precessing system 4; Device for measuring force 2 is made up of four strain force sensors, 5, four transfer blocks 6 and loading disk 7; Four transfer blocks 6 lay respectively on four side surfaces of base 1, each transfer block 6 all by three bolt tightenings on the side surface of base 1; Four strain force sensors 5 are between the upper surface and loading disk 7 lower surface of four transfer blocks 6, and each strain force sensor 5 is respectively by the upper surface of four bolt tightenings in transfer block 6 and the lower surface of loading disk 7; Four strain force sensors 5 are all made up of three parts that shape is identical, wherein two parts are positioned in horizontal direction, another part is positioned on vertical direction, and every part all posts 4 foil gauges 11 at the planimetric position place that circular arc is corresponding, four foil gauges 11 of every part and dynamic strain indicator 3 can form a full-bridge, full-bridge 8,9 in horizontal direction ensures that it can measure along the vibration force of Z axis and the oscillatory torque around X, Y-axis, and the full-bridge 10 on vertical direction ensures that it can measure the vibration force along X, Y-axis and the oscillatory torque around Z axis; Foil gauge 11 on four strain force sensors 5 is connected with dynamic strain indicator 3 by signal transmssion line; Dynamic strain indicator 3 is exported and is connected with Data collection and precessing system 4 by signal transmssion line; When small sample perturbations source produces vibration, the full-bridge that foil gauge 11 on four strain force sensors 5 and dynamic strain indicator 3 form produces voltage signal, this voltage signal is converted into three microvibration force signals and three microvibration torque signals by Data collection and precessing system 4, and accurate analysis goes out the vibration characteristics in small sample perturbations source based on this.
Base 1 is aluminium frame base in embodiment 1, and the shape of loading disk 7 is that inner circle is outer square, and be also alumina based material, disturbing source is arranged on the center of loading disk 7.Four strain force sensors 5 are distributed in loading disk 7 lower surface symmetrically, and are positioned at loading disk 7 edge; Four strain force sensors 5 are all made up of three parts that shape is identical that (wherein two parts are positioned in horizontal direction, a part is positioned on vertical direction), the foil gauge 11 of the stickup in every part all can form a full-bridge with dynamic strain indicator 3, full-bridge 8,9 wherein in horizontal direction can ensure that it can measure along the vibration force of Z axis and the oscillatory torque around X, Y-axis, and the full-bridge 10 on vertical direction can ensure that it can measure the vibration force along X, Y-axis and the oscillatory torque around Z axis.
Aluminium frame base to be tightened with ground by 20 bolts and is connected, and total will ensure that its rigidity meets dynamic test requirement.
Fig. 3 is strain force sensor schematic diagram, this sensor is pasted with altogether 12 foil gauges, this sensor base is fixed, when it is subject to the power along Y positive dirction, the strain of foil gauge 11.1-11.8 can be ignored, due to circular arc effect, the strain of foil gauge 11.9 place is negative, the strain of foil gauge 11.10 place is just, the strain of foil gauge 11.11 place is negative, and the strain of foil gauge 11.12 place is just; Just have in the strain of foil gauge 11.9-11.12 two for just two be negative, these four foil gauges are accessed in full-bridge circuits and then can record a voltage signal; When it is subject to the power along Z negative direction, due to circular arc effect, the strain of foil gauge 11.2,11.3,11.5,11.8 place is just, foil gauge 11.1,11.4,11.6,11.7 strain is negative, now foil gauge 11.1,11.2,11.7,11.8 can form a full-bridge, foil gauge 11.3,11.4,11.5,11.6 can form a full-bridge, and all has two normal strains, two negative strains in these two full-bridges, and now foil gauge 11.9-11.12 place strain can be ignored.Therefore, 48 foil gauges that four strain force sensors are pasted can form 12 full-bridges, by carrying out arranging the measurement that can realize disturbing source three vibration forces and three oscillatory torques according to position explained above to four strain force sensors.）
Fig. 4 is full-bridge circuit schematic diagram, and the resistance of four foil gauges 11 of access full-bridge circuit is R, and the input voltage of access full-bridge circuit is U, and the output voltage of full-bridge circuit is Δ U; Wherein U is provided by dynamic strain indicator 3, and Δ U is because foil gauge distortion produces, and accesses dynamic strain indicator 3; Have 48 foil gauges 11 in the present invention, 12 full-bridge circuits can be formed; When disturbing source produces vibration, cause the foil gauge 11 pasted thereon to deform because 4 strain force sensors 5 deform, thus 12 full-bridge circuits all produce output voltage Δ U; Dynamic strain indicator 3 collects 12 Δ U and is transferred to Data collection and precessing system by signal wire.
Ultralow frequency high precision microvibration measuring system is arranged on ground, small sample perturbations source test specimen to be arranged in loading disk 7 in the heart, check that whether the signal of the foil gauge 11 that four strain force sensors 5 are pasted is normal, run small sample perturbations source afterwards, it is made to produce vibration, thus make the full-bridge of foil gauge 11 and dynamic strain indicator 3 composition that four strain force sensors 5 are pasted produce voltage signal, this voltage signal is converted into three microvibration force signals and three microvibration torque signals by Data collection and precessing system 6, the vibration characteristics in small sample perturbations source can be gone out by accurate analysis based on this.The voltage signal of full-bridge that foil gauge that strain force sensor 5 is pasted and dynamic strain indicator 3 form due to what obtained by Data collection and precessing system 4, voltage signal to be converted to force signal, also need to demarcate device for measuring force 2, obtain corresponding transition matrix, the force signal of useful load after it being multiplied with voltage signal, can be obtained.Calibration process can complete at special calibrating device.
In a word, measuring system of the present invention accurately can measure the vibration force in small sample perturbations source, and the frequency range of measurement can be as accurate as 0Hz, and the reliability measured is high.
Non-elaborated part of the present invention belongs to techniques well known.
The above; be only part embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those skilled in the art are in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (7)
1. a ultralow frequency high-precision microvibration measuring system, is characterized in that comprising: base (1), device for measuring force (2), dynamic strain indicator (3) and Data collection and precessing system (4), device for measuring force (2) is made up of four strain force sensors (5), four transfer blocks (6), loading disk (7) and 48 foil gauges (11), four transfer blocks (6) lay respectively on four side surfaces of base (1), each transfer block (6) all by three bolt tightenings on the side surface of base (1), four strain force sensors (5) are positioned between the upper surface of four transfer blocks (6) and loading disk (7) lower surface, each strain force sensor (5) is respectively by the upper surface of four bolt tightenings in transfer block (6) and the lower surface of loading disk (7), and the shape of loading disk (7) is that inner circle is outer square, four strain force sensors (5) are all made up of three parts that shape is identical, wherein two parts are positioned in horizontal direction, another part is positioned on vertical direction, and every part all posts 4 foil gauges (11) at the planimetric position place that the circular arc of inner circle is corresponding, four foil gauges (11) of every part and dynamic strain indicator (3) composition full-bridge, full-bridge (8 in such formation two horizontal directions, 9) full-bridge (10) and on vertical direction, full-bridge (8 in two horizontal directions, 9) guarantee to measure along the vibration force of Z axis with around X, the oscillatory torque of Y-axis, full-bridge (10) on vertical direction guarantees to measure along X, the vibration force of Y-axis and the oscillatory torque around Z axis, foil gauge (11) on four strain force sensors (5) is connected with dynamic strain indicator (3) by signal transmssion line, dynamic strain indicator (3) is exported and is connected with Data collection and precessing system (4) by signal transmssion line, when small sample perturbations source produces vibration, the full-bridge that foil gauge (11) on four strain force sensors (5) and dynamic strain indicator (3) form produces voltage signal, this voltage signal is converted into three microvibration force signals and three microvibration torque signals by Data collection and precessing system (4), and accurate analysis goes out the vibration characteristics in small sample perturbations source based on this.
2. ultralow frequency high-precision microvibration measuring system according to claim 1, is characterized in that: described four transfer blocks (6) are piece of stainless steel, and are distributed in symmetrically on four side surfaces of base (1).
3. ultralow frequency high-precision microvibration measuring system according to claim 1, is characterized in that: described four strain force sensors (5) are aluminum element.
4. ultralow frequency high-precision microvibration measuring system according to claim 1, it is characterized in that: described four strain force sensors (5) lay respectively on the upper surface of four transfer blocks (6), and be distributed in symmetrically on loading disk (7) lower surface, and be positioned at the edge of loading disk (7).
5. ultralow frequency high-precision microvibration measuring system according to claim 1, is characterized in that: the side, four, top of described base (1) is connected with four transfer blocks (6) respectively; Bottom is connected with ground by 20 bolts.
6. ultralow frequency high-precision microvibration measuring system according to claim 1, it is characterized in that: the bolt of coupling part, the described needs place of being bolted must be tightened in the scope of intensity permission as far as possible, to improve the rigidity of this measuring system, ensure its measuring accuracy.
7. ultralow frequency high-precision microvibration measuring system according to claim 1, is characterized in that: described measuring system inside is empty, disturbing source is arranged on measuring system is inner or measuring system is outside.
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| CN201310244981.XA CN103323097B (en) | 2013-06-19 | 2013-06-19 | A kind of ultralow frequency high-precision microvibration measuring system |
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| CN103323097B true CN103323097B (en) | 2015-11-04 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103499381A (en) * | 2013-09-26 | 2014-01-08 | 北京空间飞行器总体设计部 | Camera shutter micro-vibration physical simulation test processing system |
| CN103471705A (en) * | 2013-09-26 | 2013-12-25 | 北京空间飞行器总体设计部 | Ultra-low frequency six-component micro-vibration measurement system |
| CN103471706B (en) * | 2013-09-26 | 2016-06-01 | 北京空间飞行器总体设计部 | A kind of micro-vibration test system of solar wing driving mechanism |
| CN104122331B (en) * | 2014-07-24 | 2016-08-17 | 北京大学 | A kind of nondestructive detection system based on piezo disc contact vibration and detection method thereof |
| CN104567934B (en) * | 2015-01-22 | 2017-05-24 | 中航捷锐（北京）光电技术有限公司 | Jig for vibration test of fiber-optic gyroscope and testing method |
| CN105606202A (en) * | 2015-12-22 | 2016-05-25 | 中国科学院长春光学精密机械与物理研究所 | High-precision ultralow frequency six-dimensional force micro-vibration measuring system |
| CN105973455B (en) * | 2016-06-27 | 2018-12-21 | 北京空间飞行器总体设计部 | A kind of piezoelectric strain combined type microvibration measuring device |
| CN109990888B (en) * | 2019-03-25 | 2020-11-24 | 中国科学院长春光学精密机械与物理研究所 | Wide-range force measuring mechanism |
| CN112014008A (en) * | 2020-07-28 | 2020-12-01 | 北京电子工程总体研究所 | Three-dimensional force sensor and force measurement system |
| CN112444365B (en) * | 2020-11-30 | 2023-08-29 | 哈尔滨工业大学 | Satellite solar wing substrate unfolding low-frequency mode testing method |
| CN113514185A (en) * | 2021-04-27 | 2021-10-19 | 中国重汽集团济南动力有限公司 | Engine suspension triaxial force sensor and adapter device thereof |
| CN114061872B (en) * | 2021-09-14 | 2023-06-16 | 北京航空航天大学 | Three-dimensional high-precision calibration system and method |
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| JPH0921720A (en) * | 1995-07-03 | 1997-01-21 | Kuratsuki:Kk | Method for analyzing vibration of structure |
| CN101592518A (en) * | 2009-06-24 | 2009-12-02 | 北京航空航天大学 | A kind of high-precision microvibration measuring system |
| CN101881651A (en) * | 2010-06-18 | 2010-11-10 | 北京航空航天大学 | Small-size portable high-accuracy disturbance measuring system |
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- 2013-06-19 CN CN201310244981.XA patent/CN103323097B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0921720A (en) * | 1995-07-03 | 1997-01-21 | Kuratsuki:Kk | Method for analyzing vibration of structure |
| CN101592518A (en) * | 2009-06-24 | 2009-12-02 | 北京航空航天大学 | A kind of high-precision microvibration measuring system |
| CN101881651A (en) * | 2010-06-18 | 2010-11-10 | 北京航空航天大学 | Small-size portable high-accuracy disturbance measuring system |
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