CN108801573A - Spacecraft high resolution camera optical jitter micro-vibration source ground simulator - Google Patents
Spacecraft high resolution camera optical jitter micro-vibration source ground simulator Download PDFInfo
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- CN108801573A CN108801573A CN201810612597.3A CN201810612597A CN108801573A CN 108801573 A CN108801573 A CN 108801573A CN 201810612597 A CN201810612597 A CN 201810612597A CN 108801573 A CN108801573 A CN 108801573A
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of high resolution camera optical jitter low-light dither axis micro-vibration source ground simulators, include mainly bearing system part and excitation system part, bearing system part is for bearing test load；Excitation system part includes mainly vibrator, exciting rod, control sensor, control system, wherein, vibrator is fixed on hoistable platform, it is connected with mounting plate by activation lever, control sensor, using single-point control mode, computer control system output drive signal, it is output to signal amplifier after modulation and is input to vibrator, table top is set to generate vibration, mechanics parameter is fed back to calculating control system by control sensor and is compared and corrects by the response at control point, and the mechanics parameter response that drive signal generates on vibrator is made to meet requirement of experiment.The device can simulate the in-orbit micro-vibration shake of high resolution camera optical axis in ground accurate quantification, and then provide experiment for the design of the micro-vibrations sensitivity satellite load such as high-resolution satellite and ensure.
Description
Technical field
The invention belongs to spacecraft interference source micro-vibration experimental technique fields, and in particular to a kind of spacecraft high-resolution phase
Machine optical jitter micro-vibration source ground simulator.
Background technology
Continuous improvement with satellite spatial camera to requirements such as spatial resolutions, in-orbit micro-vibration on certain satellites
Environmental requirement is extremely stringent, and being undertaken for task also requires celestial body that must have extremely low in-orbit micro-vibration environment, such as high-resolution
Rate earth observation systems.Therefore the superior high-precision camera of various designs, performance and precision will be special far more than current version
Not being high-resolution performance requirement causes spacecraft to increase the susceptibility of micro-vibration, and celestial body is shaken a little to image quality
Influence be can not ignore, when the influence that disturbance amplitude generates camera imaging quality reaches unacceptable degree, it is necessary to take
Effective measures are inhibited or are compensated.
Currently, the image quality under the influence of high-precision payload micro-vibration can only be verified by simulation analysis, lack
The verification means of subsystem grade carry out system-level test verification after can only delivering AIT on whole star, verify the of high cost, period
Length, risk are big, once test result cannot be met the requirements, will seriously affect development progress.Therefore, it can first be carried out on ground high-precision
The verification experimental verification for spending the image quality under the influence of the micro-vibration of payload is necessary, and to carry out verification experimental verification with regard to necessary
It accurately simulates on micro-vibration environment progress ground that will be in-orbit to camera.
Influence of the micro-vibration environment to camera can be characterized with optical jitter on star.Optical jitter shows as optical axis and is directed toward angle
Variation, can be described as mutually orthogonal two angle, θ x, θ y.Although the shake of space camera includes that there are three translation and three
Rotation, but blurred image main factor is caused to be the variation that optical axis is directed toward angle θ x, θ y, reason be mainly space camera away from
Far from the ground, the variation that optical axis is directed toward angle corresponds to prodigious picture shifting.The variation that optical axis is directed toward angle is equal to focal image shifting and focal length
The ratio between the ratio between (or ground image surface move with orbit altitude)
We term it pitching operating modes when θ x change, and we term it yaw operating modes when θ y change.
Invention content
In order to solve the above-mentioned technical problem, the present invention is intended to provide a spacecraft high resolution camera optical jitter is micro- shakes
Dynamic source ground simulator, the micro-vibration environment of the in-orbit state of satellite can be gone out by the device in ground simulation, be high-resolution
The angular displacement quantitative simulation that camera optical axis provides pitching, yaws two kinds of micro-vibration operating modes.
Present invention employs the following technical solutions：
High resolution camera optical jitter micro-vibration source ground simulator includes mainly bearing system part and exciting
Components of system as directed, the six degree of freedom that the bearing system part for bearing test load mainly supports it by mounting plate and bottom
Tooling forms；The excitation system part that offer quantitatively encourages includes mainly vibrator, exciting rod, controls sensor, control system,
Wherein, vibrator one end be fixed to hoistable platform on, the other end by activation lever, the control sensor being pasted onto in transfer block with
Mounting plate is connected, and then adjusts hoistable platform height, and the control sensor installed between mounting plate and activation lever carries out power output
The monitoring of parameter is learned, using single-point control mode, computer control system output drive signal is output to letter after zero-bit is modulated
It is input to vibrator after the amplification of number amplifier, table top is made to generate vibration, the response at control point is by control sensor by mechanics parameter
It feeds back to calculating control system to be compared and correct, the mechanics parameter response that drive signal generates on vibrator is made to meet reality
Test requirement.
Wherein, control sensor can be vibrative sensor or force snesor, carry out power output and acceleration value respectively
Monitoring.
Wherein, mounting plate upper surface has installation interface, for test products such as camera to be arranged.
Wherein, six degree of freedom tooling provides approximate free state for camera, and lower end is fixed in experimental basis, experiment production
After product are set to bearing system, 3 rank modal frequencies are less than 3Hz before system, and preceding 6 rank modal frequency is approximately less than 5Hz.
Wherein, mechanics parameter is acceleration.
Wherein, when to the yaw direction of camera optical axis into row energization, after adjusting hoistable platform height, exciting rod and control
Sensor is directly connected to the enterprising row energization of mounting plate.
Wherein, control sensor proximity setting angular displacement sensor and angle displacement measurement system, pass through angle displacement measurement system
After system and angular displacement sensor measure angular displacement signal, then required mechanics ginseng is linearly calculated by control system
Number, and then quantitative angular displacement micro-vibration signal is provided for simulator.
Wherein, when to the pitch orientation of camera optical axis into row energization, the height of hoistable platform is reduced, vibrator setting is existed
Bottom of camera, exciting rod and control sensor are directly connected to mounting plate lower surface into row energization.
The device can simulate the in-orbit micro-vibration shake of high resolution camera optical axis in ground accurate quantification, and then be high score
The design of the micro-vibrations sensitivity satellite load such as resolution satellite provides experiment and ensures.
Description of the drawings
Fig. 1 is that the high resolution camera optical jitter micro-vibration source ground simulator of the embodiment of the invention exists
Structural schematic diagram under pitching operating mode；
Wherein, 1, mounting plate；2, six degree of freedom tooling；3, vibrator；4, exciting rod；5, hoistable platform；6, control sensing
Device；7, it is tested load；8, angular displacement sensor.
Fig. 2 is that the high resolution camera optical jitter micro-vibration source ground simulator of the embodiment of the invention exists
Yaw the structural schematic diagram under operating mode；
Wherein, 1, mounting plate；2, six degree of freedom tooling；3, vibrator；4, exciting rod；5, hoistable platform；6, control sensing
Device；7, it is tested load；8, angular displacement sensor.
Specific implementation mode
Below in conjunction with attached drawing, invention is further described in detail, but this is only exemplary, it is no intended to this
The protection domain of invention carries out any restrictions.
The present invention high resolution camera optical jitter micro-vibration source ground simulator, mainly include bearing system and
Excitation system two parts.
Wherein, bearing system is mainly made of mounting plate 1, six degree of freedom tooling 2, and the main function of bearing part is carrying
Test load has the function of vibration isolation, and product can be made to be in approximate without constraint free state.
Excitation system includes vibrator 3, exciting rod 4, controls sensor 6, control system, the composition of angular displacement sensor 7,
Main function is that quantitative excitation is provided for system.The selection of vibrator 3 is critically important link, since this patent needs to carry out
The environmental simulation of micro-vibration, general modality vibration exciter output accuracy is poor, and working frequency is generally 5Hz~10kHz, low-frequency range
Waveform distortion it is larger, ambient noise is up to tens millivolts or more, is difficult to realize 1mg~10mg grades of output.Therefore use school
Mutatis mutandis excitational equipment is, it can be achieved that preferable linear convergent rate within the scope of DC~200Hz, and exciting force resolution ratio 0.1mg.
The high resolution camera optical jitter micro-vibration source of the embodiment of the invention is shown referring to Fig. 1, Fig. 1
Structural schematic diagram of the face simulator under pitching operating mode；Wherein, under pitching operating mode, as shown in Figure 1, tested load 7 is led to
It crosses the mode being spirally connected to be installed on mounting plate 1, mounting plate 1 is installed on by way of being spirally connected again in six degree of freedom tooling 2, and six certainly
It is fixed on basic foundation using crimping or by the way of being spirally connected by degree tooling 2.Hoistable platform 6 is placed on to the ground of mounting plate side
On face, vibrator 3 is bolted or other modes are fixedly installed on hoistable platform 5, and the axis of vibrator 3 is perpendicular to peace
Loading board lower surface, first reduce platform 5 height, and adjust hoistable platform ground position so that the axle center of vibrator 3 is rigid
Good position and close edge center position immediately below mounting plate lower surface.4 one end of exciting rod is mounted on vibrator central axis
On mounting hole, control sensor 6 is fixed on to the other end of activation lever 4 by screw thread or other modes, finally, adjustment lifting is flat
The height of platform 5 so that control sensor surface and mounting plate lower surface is contour, control sensor 6 and transfer block by bolt or
Other modes are fixedly linked.
Fig. 2 show be the embodiment of the invention high resolution camera optical jitter micro-vibration source ground simulation
Structural schematic diagram of the device in the case where yawing operating mode；Wherein, in the case where yawing operating mode, tested load 7 is installed by way of being spirally connected
In on mounting plate 1, mounting plate 1 is installed on by way of being spirally connected again in six degree of freedom tooling 2, and six degree of freedom tooling 2 is using pressure
The mode for connecing or being spirally connected is fixed on basic foundation.Hoistable platform 5 is placed on the ground of mounting plate side, vibrator 3 is logical
It crosses and is bolted or other modes are fixedly installed on hoistable platform 5, it is different with a upper operating mode, in the operating mode vibrator 3
Mandrel line is adjusted to horizontal, and the height for adjusting hoistable platform 5 keeps central axis and mounting plate center contour, by adjusting lifting
Platform adjusts vibrator at a distance from mounting plate in the position on ground, and 4 one end of exciting rod is mounted on vibrator central axis
Mounting hole on, sensor 7 will be controlled be fixed on by screw thread or other modes the other end of activation lever 4, finally, vibrator is logical
It crosses control sensor 7 and the side of mounting plate 1 is fixedly linked close to corner location by bolt or other modes.
It controls sensor 6 such as force snesor and micro-vibration acceleration transducer and carries out power output and acceleration value monitoring.
During encouraging simulation, using single-point control mode, computer control system output drive signal exports after zero-bit is modulated
It is input to vibrator 3 after amplifying to signal amplifier, table top is made to generate vibration.The response at control point (is added by vibrative sensor
Speed) it feeds back to calculating control system and is compared and corrects, the acceleration responsive symbol for making drive signal be generated on vibrator 1
Close requirement of experiment.Since test requirements document control output signal is angular displacement, but existing control system can only meet power or acceleration
The closed-loop control of signal, therefore intend in testing through open loop debugging first passes through after angular displacement sensor 8 measures angular displacement signal,
Linear calculate is carried out by control system again and obtains required power or acceleration.
Present embodiment is only explanation of the invention, is not limitation of the present invention, the relevant technologies people
Member can as needed make present embodiment the modification of not creative contribution after reading this specification, but as long as
It is all accordingly protected in scope of the presently claimed invention.
Claims (9)
1. high resolution camera optical jitter micro-vibration source ground simulator includes mainly bearing system part and exciting system
System part, the six degree of freedom work that the bearing system part for bearing test load mainly supports it by mounting plate and bottom
Dress composition；The excitation system part that offer quantitatively encourages includes mainly vibrator, exciting rod, controls sensor, control system,
In, vibrator one end is fixed on hoistable platform, and the other end installs control sensor by activation lever and is connected with mounting plate, then
Hoistable platform height is adjusted, the control sensor installed between mounting plate and activation lever carries out the monitoring of output mechanics parameter, adopts
With single-point control mode, computer control system output drive signal, after signal amplifier amplification is output to after zero-bit is modulated
It is input to vibrator, table top is made to generate vibration, mechanics parameter is fed back to calculating control by the response at control point by control sensor
System is compared and corrects, and the mechanics parameter response that drive signal generates on vibrator is made to meet requirement of experiment.
2. ground simulator as described in claim 1, wherein control sensor be vibrative sensor or force snesor,
Power output and acceleration value monitoring are carried out respectively.
3. ground simulator as described in claim 1, wherein mounting plate upper surface has installation interface, for examination to be arranged
Test product.
4. ground simulator as described in claim 1, wherein the test products are camera.
5. ground simulator as described in claim 1, wherein six degree of freedom tooling provides approximate free shape for camera
State, lower end are fixed in experimental basis, after test products are set to bearing system, before system 3 rank modal frequencies be less than 3Hz, preceding 6
Rank modal frequency is approximately less than 5Hz.
6. ground simulator as described in any one in claim 1-5, wherein mechanics parameter is acceleration.
7. ground simulator as claimed in claim 6, wherein when to the yaw direction of camera optical axis into row energization, adjustment
After good hoistable platform height, exciting rod and control sensor are directly connected to the enterprising row energization in mounting plate side.
8. ground simulator as claimed in claim 6, wherein control sensor proximity setting angular displacement sensor and angle position
Shift measurement system, after measuring angular displacement signal by angle displacement measurement system and angular displacement sensor, then by control system into
Required mechanics parameter is calculated in line, and then quantitative angular displacement micro-vibration signal is provided for simulator.
9. ground simulator as claimed in claim 6, wherein when to the pitch orientation of camera optical axis into row energization, reduce
Vibrator setting is directly connected to mounting plate following table by the height of hoistable platform in bottom of camera, exciting rod and control sensor
Face is into row energization.
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| CN201810612597.3A CN108801573B (en) | 2018-06-14 | 2018-06-14 | Spacecraft high-resolution camera optical axis jitter micro-vibration source ground simulation device |
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| CN108801573B CN108801573B (en) | 2020-05-08 |
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Cited By (7)
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| CN109409338A (en) * | 2018-12-03 | 2019-03-01 | 西安交通大学 | A kind of satellite micro-vibration source quantitative identification method based on blind source separate technology |
| CN110514286A (en) * | 2019-07-22 | 2019-11-29 | 北京空间机电研究所 | A kind of remote sensing satellite camera optical axis microvibration measuring method |
| CN110530508A (en) * | 2019-09-03 | 2019-12-03 | 吉林大学 | A kind of method and system detecting micro-vibration sensing device performance |
| CN111157208A (en) * | 2020-02-27 | 2020-05-15 | 广州大学 | Satellite micro-vibration isolation simulation measurement system and method |
| CN111222544A (en) * | 2019-12-22 | 2020-06-02 | 同济大学 | Ground simulation test system for influence of satellite flutter on camera imaging |
| CN111912592A (en) * | 2020-07-31 | 2020-11-10 | 上海卫星工程研究所 | Staring camera micro-vibration test equipment and method |
| CN113237622A (en) * | 2021-05-13 | 2021-08-10 | 西安科技大学 | Vibration testing system for onboard camera of heading machine |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109409338A (en) * | 2018-12-03 | 2019-03-01 | 西安交通大学 | A kind of satellite micro-vibration source quantitative identification method based on blind source separate technology |
| CN110514286A (en) * | 2019-07-22 | 2019-11-29 | 北京空间机电研究所 | A kind of remote sensing satellite camera optical axis microvibration measuring method |
| CN110514286B (en) * | 2019-07-22 | 2021-10-01 | 北京空间机电研究所 | Method for measuring micro-vibration of optical axis of remote sensing satellite camera |
| CN110530508A (en) * | 2019-09-03 | 2019-12-03 | 吉林大学 | A kind of method and system detecting micro-vibration sensing device performance |
| CN111222544A (en) * | 2019-12-22 | 2020-06-02 | 同济大学 | Ground simulation test system for influence of satellite flutter on camera imaging |
| CN111222544B (en) * | 2019-12-22 | 2023-05-02 | 同济大学 | Ground simulation test system for influence of satellite flutter on camera imaging |
| CN111157208A (en) * | 2020-02-27 | 2020-05-15 | 广州大学 | Satellite micro-vibration isolation simulation measurement system and method |
| CN111912592A (en) * | 2020-07-31 | 2020-11-10 | 上海卫星工程研究所 | Staring camera micro-vibration test equipment and method |
| CN113237622A (en) * | 2021-05-13 | 2021-08-10 | 西安科技大学 | Vibration testing system for onboard camera of heading machine |
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