CN101980027B - Gas gun excitation and collision device of laser Doppler velocity measurement impact calibration system - Google Patents
Gas gun excitation and collision device of laser Doppler velocity measurement impact calibration system Download PDFInfo
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- CN101980027B CN101980027B CN2010105316233A CN201010531623A CN101980027B CN 101980027 B CN101980027 B CN 101980027B CN 2010105316233 A CN2010105316233 A CN 2010105316233A CN 201010531623 A CN201010531623 A CN 201010531623A CN 101980027 B CN101980027 B CN 101980027B
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Abstract
The invention discloses a gas gun excitation and collision device of a laser Doppler velocity measurement impact calibration system. The device consists of a collision system and a recovery system which are arranged coaxially. A compressed gas driver actively impacts an anvil provided with a calibrated acceleration sensor, and the anvil breaks away from a support surface instantly and is recovered by the recovery system after flying freely for certain distance; at the same time, a laser Doppler velocity measurement head forming a certain included angle with the central line of a gun barrel irradiates to a laser reflection film to generate a laser frequency shift signal which is in direct proportion to the velocity variation quantity of the sensor; and the output signal and the laser Doppler frequency shift signal of the excited sensor are subjected to data processing to obtain the impact sensitivity of the acceleration sensor. The test precision for the velocity variation quantity of the sensor is high; the friction force and the eccentric torque applied to the anvil in the excitation process are weak; the influence of an interference signal output by the sensor on the acceleration signal is reduced; the sensor is convenient to calibrate; and the recovery system effectively protects the sensor and leads.
Description
Technical field
The invention belongs to the measurement and calibration field, be specifically related to a kind of crash device, particularly a kind of LDV shock calibration system gas big gun excitation crash device.
Background technology
In the calibration steps of the Coulomb sensitivity of jerk acceleration transducer; With the gas big gun is power source; By the motion of compressed gas-driven body, bump is equipped with the anvil body of acceleration transducer, is born a physical shock pulse action by the school accelerometer; The output of survey sensor reaches with movement velocity and changes, and calculates the Coulomb sensitivity of sensor.
Known excitation crash device; Be to adopt the optical cutting method principle to impact more accurate; The problem that this excitation crash device mainly exists is: (one) adopts optical cutting method principle survey sensor rapid change amount; Because what use is the top speed that average velocity replaces sensor, brings certain measuring error to test result.(2) the anvil body moves in guide; Producing friction force with the guide wall can affact on the motion anvil body; Initiatively the collision of bullet and anvil body produces eccentric moment not to the heart on the anvil body simultaneously, and the anvil body is under eccentric moment and function of friction like this; Can produce rotation or upset, the error in dipping that causes accelerometer output and test the speed.(3) the sensor installation process is complicated, all need take away big FE Tiler of weight and guide at every turn, just can exchange sensor for, and labour intensity is big.
Summary of the invention
The objective of the invention is to, a kind of LDV shock calibration system gas big gun excitation crash device is provided, this excitation crash device has improved the calibration accuracy of acceleration transducer sensitivity, and is simple to operation.
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of LDV shock calibration system gas big gun excitation crash device is made up of collision system and recovery system, and the coaxial setting of described collision system and recovery system is characterized in that:
Described collision system includes gun tube at least; One end of gun tube is connected with compression air chamber; The external diameter upper joint sleeve pipe of gun tube outlet; This sleeve pipe is a pipe that has central through hole, and the screw thread that matees with gun tube is arranged on the internal diameter of pipe one end, and upper and lower, the forward and backward symmetry of the pipe other end has the U type groove that passes tube wall; Initiatively bullet is arranged in gun tube, and the exit of sleeve pipe is connected with anvil body installing plate, in anvil body installing plate, is provided with the anvil body, is placed with the sensor that is calibrated acceleration on the anvil body, on the external diameter of anvil body laser reflective film is arranged, and in the anvil body cushion pad is installed;
Described recovery system comprises positioning pipe, and upper and lower, the forward and backward symmetry of the tube wall of this positioning pipe has the U type groove that passes tube wall, wherein, the length of the U type groove above the tube wall greater than below the tube wall, the length of the U type groove of front and back; Positioning pipe one end is positioned on the slide rail, and the positioning pipe other end is close to the inwall of sleeve pipe and is contacted with anvil body installing plate; Recovery tube is installed in the positioning pipe, and recovery tube is positioned at the bottom of positioning pipe, and and anvil body installing plate on be calibrated and leave certain distance between the acceleration transducer; Big cushion pad and a slip guide are housed in recovery tube, and wherein, big cushion pad is positioned at the bottom of recovery tube, and leaves the space between big cushion pad and the slip guide, and the minibuffer pad is housed in the slip guide;
In jacket exterior, be symmetrically arranged with the two-way LDV head angled with the positioning pipe center line, the LDV head is positioned at the positioning pipe both sides, and the U type groove measurement that sees through sleeve pipe and positioning pipe is calibrated the rapid change amount of acceleration transducer.
LDV shock calibration system gas big gun of the present invention encourages crash device, has used the velocity variable of Twin-beam laser Doppler velocity system survey sensor, has improved the measuring accuracy of sensor rapid change amount.The mounting structure without acceptance of persons of anvil body and anvil body are clashed into the back free flight, have avoided eccentric force, friction force to anvil body motional effects, have reduced the influence of sensor output undesired signal to the sensor acceleration signal, have improved the calibration accuracy of sensor.Recovery system can effectively be protected and be calibrated acceleration transducer, and makes things convenient for exchanging for of sensor.
Description of drawings
Fig. 1 is a LDV shock calibration system gas big gun excitation crash device diagrammatic cross-section of the present invention.
Fig. 2 is the synoptic diagram of anvil body installing plate shown in Figure 1, and wherein (a) is cut-open view, (b) is the side view of (a).
Fig. 3 is an anvil body synoptic diagram shown in Figure 1.Wherein (a) is front view, (b) is the cut-open view of (a).
Fig. 4 is a slip guide synoptic diagram shown in Figure 1, and wherein (a) is sectional view, (b) is the side view of (a).
Below in conjunction with accompanying drawing and preferred embodiment the present invention is made further detailed description.
Embodiment
As shown in Figure 1, LDV shock calibration system gas big gun excitation crash device of the present invention is made up of the coaxial setting of collision system and recovery system collision system and recovery system.
Collision system includes gun tube 1 at least; One end of gun tube 1 is connected with compression air chamber; The external diameter upper joint sleeve pipe 3 of gun tube 1 outlet; This sleeve pipe 3 is pipes that have central through hole, and the screw thread that matees with gun tube 1 is arranged on the internal diameter of pipe one end, and upper and lower, the forward and backward symmetry of the pipe other end has the U type groove that passes tube wall; Initiatively bullet 2 is arranged in gun tube 1, and the exit of sleeve pipe 3 is connected with anvil body installing plate 4, in anvil body installing plate 4, anvil body 7 is housed, and the sensor 8 that is calibrated acceleration is housed on the anvil body 7, and laser reflective film 6 is arranged on the external diameter of anvil body 7, and cushion pad 5 is installed in the anvil body 7;
Described recovery system comprises positioning pipe 13, and upper and lower, the forward and backward symmetry of the tube wall of this positioning pipe 13 has the U type groove that passes tube wall, wherein, the length of the U type groove above the tube wall greater than below the tube wall, the length of the U type groove of front and back; Positioning pipe 13 1 ends are positioned on the slide rail 14, and positioning pipe 13 other ends are close to the inwall of sleeve pipe 3 and are contacted with anvil body installing plate 4; Recovery tube 11 is installed in the positioning pipe 13, and recovery tube 11 is positioned at the bottom of positioning pipe 13, and and anvil body installing plate 4 on be calibrated and leave certain distance between the acceleration transducer 8; Big cushion pad 12 and a slip guide 10 are housed in recovery tube 11, and wherein, big cushion pad 12 is positioned at the bottom of recovery tube 11, and leaves the space between big cushion pad 12 and the slip guide 10, and minibuffer pad 9 is housed in the slip guide 10;
In sleeve pipe 3 outsides; Be symmetrically arranged with the two-way LDV head 15 angled with positioning pipe 13 center lines; LDV head 15 is positioned at positioning pipe 13 both sides, and the U type groove measurement that sees through sleeve pipe 3 and positioning pipe 13 is calibrated the rapid change amount of acceleration transducer 8.
As shown in Figure 2; Anvil body installing plate 4 is right cylinders that have tapered center pit 4-3; Tapered center pit 4-3 is used to place anvil body 7; The end of tapered center pit 4-3 has shoulder hole 4-1, is symmetrically arranged with cutting 4-2 at the right cylinder end face, and the central axis angle of this cutting 4-2 and anvil body installing plate 4 is 45 °.
The conical surface of the tapered center pit 4-3 of anvil body installing plate 4 is the supporting surface that anvil body 7 remains static.
As shown in Figure 3, anvil body 7 one ends are the tapering body 7-3 that are complementary with tapered center pit 4-3, and the other end is a right cylinder; On the right cylinder external diameter, be arranged with laser reflective film and paste face 7-1, cylindrical end face has step 7-6, and there is threaded hole 7-2 in step 7-6 bottom center; The fluted 7-4 of tapering body 7-3 end face, this groove 7-4 is used to place cushion pad 5.
As shown in Figure 4, slip guide 10 has central through hole 10-1, and slip guide 10 1 sides have a guide groove 10-2, and the outside surface of slip guide 10 and central through hole 10-1 inside surface are handled through overground flower.
During making, gun tube 1, sleeve pipe 3, anvil body installing plate 4 are made by stainless steel material, and wherein gun tube 1, anvil body installing plate 4 will improve the intensity of steel through bakingout process; Cushion pad 5 is made by wool felt; Laser reflective film 6 is the reflectance coating of band glass microballoon; Anvil body 7 is made by titanium alloy.
During assembling, an end of gun tube 1 is connected with compression air chamber, the other end of gun tube 1 and sleeve pipe 3 are threaded, and initiatively bullet 2 is placed in the gun tube 1.Anvil body installing plate 4 is assembled to the exit of sleeve pipe 3.Anvil body 7 is assembled among the tapered center pit 4-3 of anvil body installing plate 4.Cushion pad 5 is assembled on the groove 7-4 of anvil body 7, and reflectance coating 6 pastes on the laser reflective film installed surface 7-1 of anvil body 7.
45 ° of the central axis angles of cutting 4-2 on the anvil body installing plate 4 and anvil body installing plate 4, the wide 1.5cm of cutting 4-2.Adjustment anvil body installing plate 4 positions during assembling, the center line that makes anvil body installing plate 4 symmetric position cutting 4-2 is on same surface level.The tapered center pit 4-3 of anvil body installing plate 4 and the tapering body 7-3 on the anvil body 7 cooperate making, and tapering is 4 °, and the conical surface is smooth.When anvil body 7 is installed among the tapered center pit 4-3 of anvil body installing plate 4, rotate anvil body 7 during assembling, make laser reflective film on the anvil body 7 paste face 7-1 and cutting 4-2 on same surface level.Laser reflective film 6 pastes on the right cylinder of anvil body 7.
Pass the u type groove of sleeve pipe 3 and positioning pipe 13, the cutting 4-2 on the anvil body installing plate 4 from the laser beam that the laser instrument that tests the speed sends through LDV head 15, shine on the laser reflective film 6.Less than 0.2, among the threaded hole 7-2 of step 7-6 bottom center, assembling is by school acceleration transducer 8 through lapped face smooth finish for the step 7-6 of anvil body 7.
LDV shock calibration system gas big gun excitation crash device method of application of the present invention and principle of work are following:
Compressed gas-driven active bullet 2 high-speed motion in gun tube 1 that collision system is provided by compression air chamber; The cushion pad 5 of bump anvil body 7; The conical surface that breaks away from the tapered center pit 4-3 of anvil body installing plate 4 after anvil body 7 excited target; Space free in the positioning pipe 13 of recovery system about 1cm that flies arrives slip guide 10 and is recovered, and 9 pairs of sensors 8 of minibuffer pad in the slip guide 10 and lead-in wire shield; Big 12 pairs of slip guides 10 of cushion pad shield.
Export acceleration signal after being calibrated sensor 8 excited target of acceleration, anvil body 7 speed under the effect of damping reduces stop motion to the last gradually.Simultaneously, shining on the laser reflective film with the angled two-way LDV head 15 of positioning pipe 13 center lines of sleeve pipe 3 outer setting produces the laser frequency shift signal, and the laser frequency shift signal is proportional to the rapid change amount of sensor; Data processing is calibrated the output signal and the laser-Doppler frequency shift signal of acceleration transducer 8, obtains by the Coulomb sensitivity of school acceleration transducer.
The applicant adopts LDV shock calibration system gas big gun excitation crash device of the present invention, carries out replica test, and calibration data is as shown in the table.Sensor is selected 8309 sensors of B&K company for use.Through handling this group data, the reproducibility error that obtains LDV shock calibration system is 0.84% to the maximum.
The repeated experiment calibration data table
Claims (9)
1. a LDV shock calibration system gas big gun excitation crash device is made up of collision system and recovery system, and the coaxial setting of described collision system and recovery system is characterized in that:
Described collision system includes gun tube (1) at least; One end of gun tube (1) is connected with compression air chamber; The external diameter upper joint sleeve pipe (3) of gun tube (1) outlet; This sleeve pipe (3) is a pipe that has central through hole, has on the internal diameter of pipe one end and the screw thread of gun tube (1) coupling, and upper and lower, the forward and backward symmetry of the pipe other end has the U type groove that passes tube wall; Initiatively bullet (2) is arranged in gun tube (1); The exit of sleeve pipe (3) is connected with anvil body installing plate (4); In anvil body installing plate (4), be provided with anvil body (7); Be placed with the sensor (8) that is calibrated acceleration on the anvil body (7), laser reflective film (6) is arranged on the external diameter of anvil body (7), cushion pad (5) is installed in the anvil body (7);
Described recovery system comprises positioning pipe (13), and upper and lower, the forward and backward symmetry of the tube wall of this positioning pipe (13) has the U type groove that passes tube wall, wherein, the length of the U type groove above the tube wall greater than below the tube wall, the length of the U type groove of front and back; Positioning pipe (13) one ends are positioned on the slide rail (14), and positioning pipe (13) other end is close to the inwall of sleeve pipe (3) and is contacted with anvil body installing plate (4); Recovery tube (11) is installed in the positioning pipe (13), and recovery tube (11) is positioned at the bottom of positioning pipe (13), and and anvil body installing plate (4) on the sensor that is calibrated acceleration (8) between leave certain distance; A big cushion pad (12) and a slip guide (10) are housed in recovery tube (11); Wherein, Big cushion pad (12) is positioned at the bottom of recovery tube (11), and leaves the space between big cushion pad (12) and the slip guide (10), and minibuffer pad (9) is housed in the slip guide (10);
In sleeve pipe (3) outside; Be symmetrically arranged with and the angled two-way LDV head (15) of positioning pipe (13) center line; LDV head (15) is positioned at positioning pipe (13) both sides, and the U type groove measurement that sees through sleeve pipe (3) and positioning pipe (13) is calibrated the rapid change amount of acceleration transducer (8).
2. LDV shock calibration system gas big gun excitation crash device as claimed in claim 1; It is characterized in that; Described anvil body installing plate (4) is a right cylinder that has tapered center pit (4-3), and tapered center pit (4-3) is used to place anvil body (7), and an end of tapered center pit (4-3) has shoulder hole (4-1); Be symmetrically arranged with cutting (4-2) at the right cylinder end face, this cutting (4-2) is 45 ° with the central axis angle of anvil body installing plate (4).
3. LDV shock calibration system gas big gun excitation crash device as claimed in claim 1 is characterized in that described anvil body (7) one ends are the tapering bodies (7-3) that are complementary with tapered center pit (4-3), and the other end is a right cylinder; On the right cylinder external diameter, be arranged with laser reflective film and paste face (7-1), cylindrical end face has step (7-6), and there is threaded hole (7-2) in step (7-6) bottom center; Tapering body (7-3) end face fluted (7-4), this groove (7-4) is used to place cushion pad (5).
4. LDV shock calibration system gas big gun excitation crash device as claimed in claim 1; It is characterized in that; Described slip guide (10) has central through hole (10-1); Slip guide (10) one sides have a guide groove (10-2), and the outside surface of slip guide (10) and central through hole (10-1) inside surface are handled through overground flower.
5. LDV shock calibration system gas big gun excitation crash device as claimed in claim 2 is characterized in that the conical surface of the tapered center pit (4-3) of described anvil body installing plate (4) is the supporting surface that anvil body (7) remains static.
6. LDV shock calibration system gas big gun excitation crash device as claimed in claim 1; It is characterized in that; Described gun tube (1), sleeve pipe (3) and anvil body installing plate (4) are made by stainless steel material, and said anvil body (7) is made by titanium alloy.
7. LDV shock calibration system gas big gun excitation crash device as claimed in claim 1 is characterized in that said laser reflective film (6) is the reflectance coating of band glass microballoon.
8. LDV shock calibration system gas big gun excitation crash device as claimed in claim 1 is characterized in that said slide rail is that (14) are the long columns of square.
9. LDV shock calibration system gas big gun excitation crash device as claimed in claim 1 is characterized in that said slip guide (10) is by the bakelite material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105316233A CN101980027B (en) | 2010-11-04 | 2010-11-04 | Gas gun excitation and collision device of laser Doppler velocity measurement impact calibration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105316233A CN101980027B (en) | 2010-11-04 | 2010-11-04 | Gas gun excitation and collision device of laser Doppler velocity measurement impact calibration system |
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| CN101980027A CN101980027A (en) | 2011-02-23 |
| CN101980027B true CN101980027B (en) | 2012-04-25 |
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| CN2010105316233A Expired - Fee Related CN101980027B (en) | 2010-11-04 | 2010-11-04 | Gas gun excitation and collision device of laser Doppler velocity measurement impact calibration system |
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| CN107073726B (en) * | 2016-03-01 | 2018-11-20 | 深圳市大疆创新科技有限公司 | The calibration method of the armoring inductive component of robot, device and system |
| CN106500546B (en) * | 2016-10-31 | 2017-10-13 | 西南科技大学 | Gas big gun based on the interference of light and multi-stage LED illumination is to target system |
| CN108195462B (en) * | 2018-02-05 | 2020-04-03 | 浙江大学 | Calibration device of vibration sensor |
| CN108180987B (en) * | 2018-02-05 | 2020-03-17 | 浙江大学 | Calibration device for vibration sensor |
| CN108180988B (en) * | 2018-02-05 | 2020-03-24 | 浙江大学 | Positive step acceleration exciting device |
| CN108344883B (en) * | 2018-02-05 | 2020-04-03 | 浙江大学 | Positive step acceleration exciting device |
| CN111220818B (en) * | 2019-12-10 | 2021-10-19 | 哈尔滨工程大学 | Device for calibrating speed measurement precision of Doppler current meter |
| CN111413517A (en) * | 2020-05-06 | 2020-07-14 | 苏州笛灵科技有限公司 | Air-throwing impact type calibration device of acceleration sensor and using method thereof |
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| CN1076477C (en) * | 1996-04-22 | 2001-12-19 | 华北工学院 | Impact correction technology for high magnitude accelerometer and its device |
| JP4022580B2 (en) * | 1997-09-22 | 2007-12-19 | 独立行政法人 日本原子力研究開発機構 | Apparatus and method for evaluating pressure response of liquid filled rigid container structure |
| CN101458152B (en) * | 2008-11-27 | 2010-12-29 | 中北大学 | High g value impact acceleration simulation test system and method , test method and application |
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