CN102589567A - Method for measuring torsion angle rate of linear vibration table - Google Patents
Method for measuring torsion angle rate of linear vibration table Download PDFInfo
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- CN102589567A CN102589567A CN2012100074504A CN201210007450A CN102589567A CN 102589567 A CN102589567 A CN 102589567A CN 2012100074504 A CN2012100074504 A CN 2012100074504A CN 201210007450 A CN201210007450 A CN 201210007450A CN 102589567 A CN102589567 A CN 102589567A
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Abstract
The invention discloses a method for measuring the torsion angle rate of a linear vibration table and aims to solve the problem that the accuracy and reliability of the conventional measurement method cannot be ensured. According to the method, the torsion angle rate of the linear vibration table, which is added in each direction under different linear vibration frequencies, is measured by using an optical fiber gyroscope. The optical fiber gyroscope is fixed on a table surface of the linear vibration table toward three orthogonal directions, output data of the optical fiber gyroscope in the vibration process of the linear vibration table are respectively measured, and a torsion angle rate curve of the linear vibration table in the corresponding direction is obtained to evaluate the performance of the linear vibration table. By adoption of the method, the torsion angle rate in the three orthogonal directions in the vibration process of the linear vibration table can be measured quickly and directly. The method has the advantages of high accuracy, large bandwidth, convenience for operation and the like.
Description
Technical field
The invention belongs to the automatization testing technique field, be specifically related to a kind of measuring method of line shaking table torsion angle speed.
Background technology
Inertial navigation system can be born very big vibration in the course of the work, and during such as the emission of rocket and guided missile and flight, the sensing unit in the inertial navigation system will bear the vibration of high-magnitude, and be accompanied by sustained acceleration.The line shaking table can be simulated the vibration environment condition that is born in the inertia components and parts course of work, is used for the experiment sieving before inertia device gets into equipment.Outstanding line shaking table should only wired vibration, and does not have angular oscillation, but the restriction that actual line shaking table receives processing technology, product that center of gravity variation, stage body rigidity of material, controller performance are installed unavoidably exists three-dimensional to reverse.This three-dimensional is reversed the line vibration performance that has reflected the line shaking table.Comprise gyro and Jia Biao in the Inertial Measurement Unit; When Inertial Measurement Unit is positioned over the test of the enterprising column rule vibration performance of the bigger line vibration table surface of torsion angle speed ratio; The responsive size of gyro to torsion angle speed; The gyroscopic drift mutual superposition that causes with line vibration, obscure, be not sure of gyro line vibration performance and whether meet the demands.Therefore, before using the line shaking table environmental experiment and screening are carried out in combination to inertia measurement, must demarcate, make its torsion angle speed except that the line vibration as far as possible little the line shaking table.
The method commonly used of current calibration line shaking table is to adopt two-frequency laser interferometer, and the slotted line shaking table is the torsional displacement of estrade on all directions when vibration, is converted into the angle of reversing according to certain formula again.But this method will guarantee measuring reliability, and light path needs accurately to aim at, and is very high to the installation requirement of catoptron.If these conditions can not satisfy, the precision of this measuring method just can not guarantee, can not guarantee measuring reliability.What the topmost shortcoming of this method was that sensor directly measures is angle, again according to the relation of angle and frequency, and the size of calculating torsion angle speed.
Optical fibre gyro is the best sensor of measured angular speed, utilizes the Sagnac effect, directly measures the angular speed of carrier with respect to inertial space.Because its bandwidth very high (can reach 1MHz), very high precision (0.001 °/h), and do not need the external reference thing, can realize the autonomous measurement that shaking table is reversed.Zhejiang University has heightened awareness through for many years further investigation to fiber optic gyroscope performance.Line shaking table research institute has developed a line shaking table according to the requirement of Zhejiang University; The optical fibre gyro of Zhejiang University's development carries out 6g on this shaking table; During the vibration of the frequency sweep of 10-3kHz, vibration not have to influence to gyro basically, and the output of optical fibre gyro is the same basically when static when promptly vibrating.When using this optical fibre gyro on another one ordinary lines shaking table, to test, it is very big to measure in the line shaking table vibration processes torsion angle speed, reaches the magnitude of 50 °/s.
Therefore, use optical fibre gyro to carry out the assessment of shaking table twisting property, research institute has extremely important meaning to the guide line shaking table.Through optical fibre gyro is installed on the line shaking table along three directions of quadrature respectively; Measure the torsion angle speed on this direction; Thereby the performance of evaluation line shaking table has been filled up the blank of direct measuring vibrations platform torsion angle speed, and is significant for aerospace development.
Summary of the invention
The objective of the invention is deficiency, a kind of measuring method of line shaking table torsion angle speed is provided to prior art.
This method is the torsion angle speed on three orthogonal directionss in the slotted line shaking table vibration processes directly; This measuring method through with optical fibre gyro respectively towards three directions of quadrature; Be installed to the measurement that realizes on the line vibration table surface torsion angle speed on three orthogonal directionss of line vibration table surface through frock, measuring method implementation step of the present invention is following:
Step (1). through on the fixing online vibration table surface of frock, the optical fibre gyro sensitive direction is parallel with line vibration table surface direction of vibration with optical fibre gyro;
Step (2). start line shaking table vibration source; The control line vibration table surface begins vibration with the mode of vibration that requires; The output of measuring optical fiber gyro, T is after the time, and the line vibration table surface stops vibration; Obtain the torsion angle speed of line shaking table on the optical fibre gyro sensitive direction described in the step (1), then optical fibre gyro is taken off;
Step (3). through on the fixing online vibration table surface of frock, the optical fibre gyro sensitive direction is vertical with the line vibration table surface with optical fibre gyro; Repeating step (2) obtains the torsion angle speed of line shaking table on the described optical fibre gyro sensitive direction of step (3), then optical fibre gyro is taken off;
Step (4). through on the fixing online vibration table surface of frock, the optical fibre gyro sensitive direction is parallel to the line vibration table surface simultaneously perpendicular to the direction of vibration of line shaking table with optical fibre gyro; Repeating step (2) obtains the torsion angle speed on the optical fibre gyro sensitive direction described in line shaking table such as the step (4), then optical fibre gyro is taken off;
Described time T is greater than 1 second;
Among the present invention, the mode of vibration of line shaking table and time of vibration, wherein mode of vibration involving vibrations frequency and vibration level can be selected according to the measurement requirement of line shaking table.
Among the present invention, in described step (1), step (3), the step (4), the measuring sequence of three orthogonal directions torsion angles of line shaking table speed can be changed arbitrarily.That is, can survey earlier step (1), again survey step (4), survey step (3) at last; Also can survey earlier step (3), again survey step (4), survey step (1) at last; Also can survey earlier step (3), again survey step (1), survey step (4) at last; Also can survey earlier step (4), again survey step (1), survey step (3) at last; Also can survey earlier step (4), again survey step (3), survey step (1) at last.
The inventive method beneficial effect:
The present invention provides the method that can directly measure line shaking table torsion angle speed, and than traditional line shaking table torsion angle speed measurement method, precision is higher, bandwidth is bigger, operation is more simple and convenient, and measurement result is more reliable.Use the inventive method to carry out the assessment of shaking table twisting property, research institute has extremely important meaning to the guide line shaking table.The inventive method has been filled up the blank of direct measuring vibrations platform torsion angle speed, and is significant for aerospace development.
Description of drawings
Fig. 1 is the torsion angle speed measurement method synoptic diagram of slotted line shaking table on three orthogonal directionss among the present invention;
Fig. 2 is parallel to the torsion angle speed measurement method synoptic diagram on the X-direction for slotted line shaking table among the present invention;
Fig. 3 is parallel to the torsion angle speed measurement method synoptic diagram on the Y direction for slotted line shaking table among the present invention;
Fig. 4 is parallel to the torsion angle speed measurement method synoptic diagram on the Z-direction for slotted line shaking table among the present invention.
Among the figure: 1. line shaking table vibration source; 2. line vibration table surface; 3. the pedestal of line shaking table; 4. X axis optical fibre gyro; 5.Y axial optical fiber gyro; 6.Z axial optical fiber gyro.
Embodiment
Below in conjunction with shown in the accompanying drawing content of the present invention being described further.
As shown in Figure 1, be the method synoptic diagram of the torsion angle speed of slotted line shaking table on three orthogonal directionss, with optical fibre gyro respectively towards three directions of quadrature; Be installed on the line vibration table surface through frock; The torsion angle speed of slotted line shaking table, three directions of quadrature are respectively X, Y, three directions of Z axle, and wherein the X axle is parallel with the shaking table direction of vibration; The Y axle is vertical with vibration table surface; The Z axle is vertical simultaneously parallel with vibration table surface with the shaking table direction of vibration, and shaking table pedestal 3 is positioned under the 2. line vibration table surfaces, plays the effect of vibration isolation and damping.
Step (1). as shown in Figure 2, X axis optical fibre gyro 4 is fixed on the line vibration table surface 2 through frock, X axis optical fibre gyro 4 is parallel with line vibration table surface 2 direction of vibration;
Step (2). start line shaking table vibration source 1; Control line vibration table surface 2 begins vibration with the mode of vibration that requires; The output of measuring optical fiber gyro, T is after the time, and the line vibration table surface stops vibration; Obtain the torsion angle speed of line shaking table on X axis optical fibre gyro 4 sensitive directions described in the step (1), then X axis optical fibre gyro 4 is taken off;
Step (3). shown in Fig. 3, Y axial optical fiber gyro 5 is fixed on the line vibration table surface through frock, Y axial optical fiber gyro sensitive direction is vertical with the line vibration table surface; Repeating step (2) obtains the torsion angle speed of line shaking table on the described Y axial optical fiber of step (3) gyro 5 sensitive directions, then Y axial optical fiber gyro 5 is taken off;
Step (4). shown in Fig. 4, Z axial optical fiber gyro 6 is fixed on the line vibration table surface through frock, Z axial optical fiber gyro 6 sensitive directions are parallel to the line vibration table surface simultaneously perpendicular to the direction of vibration of line shaking table; Repeating step (2) obtains the torsion angle speed on Z axial optical fiber gyro 6 sensitive directions described in line shaking table such as the step (4), then Z axial optical fiber gyro 6 is taken off.
Described time T is greater than 1 second.
Described X axis optical fibre gyro 4, Y axial optical fiber gyro 5, Z axial optical fiber gyro 6 are same optical fibre gyro, and just installation direction is different;
Among the present invention, the mode of vibration of line shaking table and time of vibration, wherein mode of vibration involving vibrations frequency and vibration level can be selected according to the measurement requirement of line shaking table.
Claims (1)
1. the measuring method of a line shaking table torsion angle speed is characterized in that following steps:
Step (1). on the fixing online vibration table surface of optical fibre gyro, the optical fibre gyro sensitive direction is parallel with line vibration table surface direction of vibration;
Step (2). start line shaking table vibration source; The control line vibration table surface begins vibration with the mode of vibration that requires; The output of measuring optical fiber gyro, T is after the time, and the line vibration table surface stops vibration; Obtain the torsion angle speed of line shaking table on the optical fibre gyro sensitive direction described in the step (1), then optical fibre gyro is taken off;
Step (3). on the fixing online vibration table surface of optical fibre gyro, the optical fibre gyro sensitive direction is vertical with the line vibration table surface; Repeating step (2) obtains the torsion angle speed of line shaking table on the described optical fibre gyro sensitive direction of step (3), then optical fibre gyro is taken off;
Step (4). on the fixing online vibration table surface of optical fibre gyro, the optical fibre gyro sensitive direction is parallel to the line vibration table surface simultaneously perpendicular to the direction of vibration of line shaking table; Repeating step (2) obtains the torsion angle speed on the optical fibre gyro sensitive direction described in line shaking table such as the step (4), then optical fibre gyro is taken off;
Described time T is greater than 1 second;
The mode of vibration of described line shaking table and time of vibration, wherein mode of vibration involving vibrations frequency and vibration level can be selected according to the measurement requirement of line shaking table;
In described step (1), step (3), the step (4), the measuring sequence of three orthogonal directions torsion angles of line shaking table speed can be changed arbitrarily; That is, can survey earlier step (1), again survey step (4), survey step 3 at last; Also can survey earlier step (3), again survey step (4), survey step (1) at last; Also can survey earlier step (3), again survey step (1), survey step (4) at last; Also can survey earlier step (4), again survey step (1), survey step (3) at last; Also can survey earlier step (4), again survey step (3), survey step (1) at last.
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| CN2012100074504A CN102589567A (en) | 2012-01-12 | 2012-01-12 | Method for measuring torsion angle rate of linear vibration table |
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| CN2012100074504A CN102589567A (en) | 2012-01-12 | 2012-01-12 | Method for measuring torsion angle rate of linear vibration table |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060248955A1 (en) * | 2005-04-07 | 2006-11-09 | Imv Corporation | Vibration-testing system |
| CN101509785A (en) * | 2009-03-16 | 2009-08-19 | 浙江大学 | Misalignment evaluating method for optical fibre gyro input axis |
| CN102135420A (en) * | 2010-12-10 | 2011-07-27 | 浙江大学 | Method for improving angular displacement measurement accuracy of optical fiber gyroscope |
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2012
- 2012-01-12 CN CN2012100074504A patent/CN102589567A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060248955A1 (en) * | 2005-04-07 | 2006-11-09 | Imv Corporation | Vibration-testing system |
| CN101509785A (en) * | 2009-03-16 | 2009-08-19 | 浙江大学 | Misalignment evaluating method for optical fibre gyro input axis |
| CN102135420A (en) * | 2010-12-10 | 2011-07-27 | 浙江大学 | Method for improving angular displacement measurement accuracy of optical fiber gyroscope |
Non-Patent Citations (1)
| Title |
|---|
| 李春枝等: "《基于光纤陀螺技术的三轴振动转角测试》", 《传感器与微系统》 * |
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Application publication date: 20120718 |