CN108195462A - A kind of calibrating installation of vibrating sensor - Google Patents
A kind of calibrating installation of vibrating sensor Download PDFInfo
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- CN108195462A CN108195462A CN201810114757.1A CN201810114757A CN108195462A CN 108195462 A CN108195462 A CN 108195462A CN 201810114757 A CN201810114757 A CN 201810114757A CN 108195462 A CN108195462 A CN 108195462A
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- block
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
Abstract
The invention discloses a kind of calibrating installation of vibrating sensor, including being used to install the mounting blocks of corrected sensor and the transmission block of step force being provided for mounting blocks, mounting blocks transmit block rear, transmitting block has the transmission end that can be contacted with mounting blocks preceding；Block is transmitted to be installed in hyperbaric chamber, the transmission end for transmitting block exposes to hyperbaric chamber, transmission block bears the air pressure in hyperbaric chamber, transmit block with the connecting pin being connect with drawstring, drawstring is connect with force module, the module that exerts a force is after block is transmitted, and air pressure is to transmitting the thrust of block generation and the pulling force of drawstring on the contrary, there is hyperbaric chamber prevention to transmit positive stop and backstop that block is detached from；When drawstring is broken, transmits block and positive step force applied to mounting blocks under gas pressure, transmit block stopped by positive stop after, negative step force is applied to mounting blocks.The present invention provides positive step acceleration pumping signal when drawstring is broken, using the air pressure in high-pressure chamber to transmitting block, and air pressure is controllable it is found that therefore compared with common pulse excitation signal, the waveform controllability of the positive step acceleration pumping signal and reproducible.
Description
Technical field
The present invention relates to the fields of measurement of vibrating sensor, particularly a kind of school for being used to calibrate vibrating sensor sensitivity
Standard apparatus.
Technical background
Vibrating sensor is the sensor for detecting impact force or acceleration.The school of the Coulomb sensitivity of vibrating sensor
It in quasi- method, usually using gas big gun as power source, is moved by compressed gas-driven body, hits the anvil for being equipped with corrected sensor
Body, corrected sensor bear mechanical shock impulse action, measure corrected sensor output and movement velocity variation, calculate by
The Coulomb sensitivity of school sensor.
Chinese patent 201010531623.3 discloses a kind of gas big gun excitation crash device, by collision system and recycling
System forms, and collision system and recovery system coaxial arrangement, the shock of compressed gas-driven active bullet, which is equipped with, is calibrated acceleration
The anvil body of sensor, anvil body are instantaneously detached from supporting surface, and system recycling is recovered after free flight a distance.This gas big gun excitation
The shortcomings that pumping signal that crash device generates is pulse acceleration signal, the device is：The pulse acceleration peak value of generation
Retention time is short, it is more difficult to accurately measure acceleration amplitude.
Invention content
The object of the present invention is to provide a kind of vibrating sensor in dynamic calibration, the peak value of positive step acceleration is protected
It holds that the time is long, can accurately measure the calibrating installation of the vibrating sensor of acceleration amplitude.
The calibrating installation of vibrating sensor, including being used to install the mounting blocks of corrected sensor and providing step for mounting blocks
The transmission block of power, mounting blocks transmit block rear, transmitting block has the transmission end that can be contacted with mounting blocks preceding；Transmit block peace
Hyperbaric chamber is exposed to loaded on the transmission end in hyperbaric chamber, transmitting block, transmission block bears the air pressure in hyperbaric chamber, and that transmits block has
The connecting pin being connect with drawstring, drawstring are connect with force module, and force module is after block is transmitted, and air pressure is to transmitting block generation
The pulling force of thrust and drawstring is on the contrary, hyperbaric chamber has the positive stop and backstop for preventing to transmit block disengaging；When drawstring is broken, transmit
Block applies positive step force under gas pressure to mounting blocks, transmit block stopped by positive stop after, negative step force is applied to mounting blocks.
Drawstring is steel wire rope.
Mounting blocks are located in rail module, without friction between mounting blocks and rail module.Referred to be to say to rub without friction
Wiping power can be ignored rather than absolute frictional force is 0.
Mounting blocks and rail module friction free rail module concrete structure can be realized by providing one kind：Rail module is by leading
Rail and mounting base composition, guide rail have the hole coordinated with mounting blocks, there is gap between mounting blocks and guide rail, and branch is filled in the gap
Support lubricating film.
Further, guide rail is air-float guide rail, and air-float guide rail includes lower air supporting support member and upper air supporting support member, lower gas
Floating support member and upper air supporting support member surround the hole coordinated with mounting blocks jointly, and support lubricating film is air film.
Further, lower air supporting support member and upper air supporting support member are respectively provided with the gentle connector of venthole, air admission hole, gas
Connector is installed on air admission hole, and gas connector is connected with low-pressure gas source；The gas overflowed from venthole forms above-mentioned air film.
Further, upper air supporting support member is attached fixation with lower air supporting support member by bolt.
It is as follows to provide a kind of concrete structure of high-pressure chamber：Hyperbaric chamber has cylinder and blind flange, and cylinder and blind flange enclose
Into high-pressure chamber；Cylinder and blind flange are equipped with the cavity volume for accommodating and transmitting block, and cavity volume is from axially penetrating through cylinder and blind flange；After keep off
Block is fixed with blind flange, and positive stop is fixed with cylinder, and positive stop has the through-hole for allowing transmission end exposed.When drawstring is from rear pair
When transmitting block force, backstop resists transmission block, prevents to transmit block disengaging hyperbaric chamber.
Further, it transmits block and has and bear the thrust stress surface of air pressure, the pulling force stress surface that is pushed against by backstop and preceding
The stop surface that block pushes against, the connecting pin for transmitting block expose to hyperbaric chamber, and pulling force stress surface is located at before connecting pin, and connecting pin is set
There is the aperture passed through for drawstring.
Further, transmitting block has ontology, and tool is there are three step on ontology, until the step surface of the first step of foremost
Block face, the step surface of last second step is pulling force stress surface, and intermediate step surface is thrust stress surface, and thrust stress surface is sudden and violent
It is exposed to high-pressure chamber.
Further, there are air admission hole, monitoring holes and relief hole on cylinder, air admission hole is connected by pressure reducing valve and high-pressure air source
It connects, monitoring holes, which are connected through a screw thread, is equipped with pressure sensor, and for monitoring the pressure change in cavity in real time, relief hole passes through
Threaded connection is equipped with safety valve, and when cavity pressure is more than design value, then safety valve is opened.
Further, it is sealed, and fixation is attached by bolt using metal plain cushion between cylinder and blind flange.
It is as follows to provide a kind of concrete structure for the module that exerts a force：The module that exerts a force has pull rod, electric pushrod and push rod mounting base,
Pull rod is connect with electric pushrod, has drawstring mounting portion on pull rod.
Further, pull rod runs through linear bearing component, and linear bearing component is a pair, and linear bearing component is by linear bearing
It is formed with bearing block, the front end of pull rod is attached with drawstring mounting portion by screw thread.Linear bearing component leads pull rod
To, make pulling force keep transfers.
Further, drawstring mounting portion includes link block, compact heap and fastening bolt.Link block is carried out with pull rod by screw thread
Connection is fixed, and is plane contact between compact heap and link block, drawstring passes through between compact heap and link block, and passes through and turn
The pressing force between link block and compact heap can be changed in fastening bolt.
Buffer limit module is fixedly mounted before mounting blocks, after transmission block excitation mounting blocks travel forward, mounting blocks connect
Contact stop motion after buffer limit module.A kind of specific knot of the buffer limit module for the kinetic energy that can absorb mounting blocks is provided
Structure is as follows：
Buffer limit module is fixed on before mounting blocks, and buffer limit module has cushioning support-saddle, buffer and gag lever post,
Buffer is fixed on cushioning support-saddle, and gag lever post is installed on buffer, and gag lever post is the component for being in direct contact mounting blocks.Pass through limiting
The setting of pole length, so as to fulfill the control to mounting blocks move distance.
Further, buffer has multiple, and multiple buffers are symmetrical along short transverse.
Further, gag lever post one end is fixed with buffer, cushion pad is fixed on the other end.Gag lever post one end and buffer
It is connected through a screw thread, the gag lever post other end is connect with cushion pad by glue, the quality such as cushion pad generally use felt or rubber
Softer material, for limiting process to be avoided to generate rigid collision.
Further, be provided on cushioning support-saddle allow laser interferometer light path by measured hole, laser interferometer swash
Optical registration mounting blocks.Laser interferometer measurement obtains the movement velocity of mounting blocks.
Further, calibrating installation has pedestal, and hyperbaric chamber, rail module, force module and buffer limit module are led to respectively
Respective installing plate is crossed to be fixedly connected with pedestal；Hyperbaric chamber, rail module, force module and the mutual centering of buffer limit module.
Further, pedestal is equipped with positioning groove, and each installing plate matches respectively with positioning groove, and is bolted
In on pedestal；The cylinder of hyperbaric chamber and the installing plate of hyperbaric chamber are fixed, and mounting base and the rail module installing plate of rail module are consolidated
It is fixed；Respective T-slot is respectively equipped on the installing plate of buffer limit module and the installing plate of force module, cushioning support-saddle is limited with buffering
The installing plate of position module is attached fixation by T-nut, and the bearing block and the installing plate of force module of the module that exerts a force pass through T
Type nut is attached fixation；T-nut is located in respective T-slot respectively.
In the use of the present invention, corrected sensor is mounted on mounting blocks, then mounting blocks are led mounted on air supporting first
On rail, then by controlling electric pushrod that steel wire compacting part is driven to move to push rod limit on the right-right-hand limit position, then wire passes through
The aperture of block one end is transmitted, then wire is passed through into the gap among link block and compact heap, taut wire line simultaneously tightens fastening
Then bolt sets air pressure size P, and keeps the stable gas pressure in high-pressure chamber.
It transmits block and moves to transmission block limit on the left position under the influence of air pressure, then electric pushrod is controlled to drive wire
It stretches to the right, transmits block and moved right transmission block limit on the right-right-hand limit position by the active force of wire, moving mounting blocks at this time makes
Its end face is in close contact with transmitting block end face, then electric pushrod is controlled to continue to move right, the pulling force that wire is subject to is rapid
Increase, until suffered pulling force is more than the ultimate tension of wire, wire is broken suddenly.
Negative step acceleration generates process：When wire is broken suddenly, transmission block is pushed installation by positive step active force
Block and corrected sensor travel forward jointly, and then generate positive step acceleration, are then done jointly under the action of air cavity pressure
Uniformly accelerated motion, when transmitting the left end shaft shoulder of block by the barrier effect of positive stop, mounting blocks are by negative step action power at this time,
And then negative step acceleration is generated, finally continue uniform motion forward under effect of inertia.
When the left end face of mounting blocks and the cushion pad of limiting component collide limiting, the kinetic energy of mounting blocks passes through buffering
Device absorbs, and final mounting blocks and corrected sensor are stopped in extreme position, and sensor calibration processes terminate.
Advantages of the present invention is as follows：
1st, when drawstring is broken, positive step acceleration pumping signal is provided to transmitting block using the air pressure in high-pressure chamber,
Air pressure is controllable it is found that therefore compared with common pulse excitation signal, the waveform controllability of the positive step acceleration pumping signal
It is and reproducible.
2nd, using the acceleration energisation mode of double quality blocks impact separation, the failing edge time of negative step acceleration reaches micro-
Second grade, therefore the frequency range analyzed can reach 100,000 hertz of ranks.
Description of the drawings
The practical step signal time-domain curves of Fig. 1.
The practical step signal frequency curves of Fig. 2.
Fig. 3 double quality blocks schematic diagrames.
Fig. 4 exciting bank general illustrations.
Fig. 5 hyperbaric chamber structure sectional views.
Fig. 6 rail module structure diagrams.
Fig. 7 force modular structure vertical views.
Fig. 8 buffer limit modular structure schematic diagrams.
Fig. 9 step Acceleration pulse schematic diagrames.
Specific embodiment
In systems in practice, ideal step signal is not present, and the rising edge or failing edge of step signal certainly exist
Transit time τ, it is believed that be with sloping step signal, practical step signal curve is as shown in Figure 1.When transit time τ becomes
When being bordering on 0, practical step signal then becomes ideal step signal.Practical step signal x*(t) it is represented by
For effective unit phase step response signals x*(t), frequency spectrum function is
It is illustrated in figure 2 amplitude-versus-frequency curve during τ=0.03s.Figure it is seen that practical step signal is certain
The amplitude of Frequency point is zero, is enabled
It can obtain, ω τ=2k π (k=1,2,3L), i.e.,It therefore can be with corresponding to transit time τ
The highest frequency of analysis is
By above formula can with it is concluded that：Transit time, τ was smaller, then the non-zero bandwidth of step signal is wider.
Intend generating step acceleration using two two mass blocks impact separation, as shown in figure 3, respectively installation quality block
With Transfer Quality block, referred to as mounting blocks and transmission block.
Mounting blocks and transmission block just start mutually to be close to, and it is common under the action of positive step force to transmit block right-hand axis shoulder end face
Movement generates positive step acceleration, that is, obtains a certain size step acceleration amplitude；Then uniformly accelerated motion is for a period of time
Afterwards, it transmits block left-hand axis shoulder end face and is stopped that mounting blocks are acted on by negative step force suddenly, generate negative step acceleration, and
It is rapidly separated with transmitting block, continues uniform forward motion under the action of inertia.
As shown in figure 4, the calibrating installation of vibrating sensor includes hyperbaric chamber 2, rail module 3, force module 4, buffering limit
The pedestal 1 of position module 5, wire 6 and fixed above each function module.
As shown in figure 5, in one embodiment, hyperbaric chamber is for ensureing intracavitary hyperbar, and driving is provided to block is transmitted
Air pressure, including cylinder 21, positive stop 23, blind flange 29, backstop 26.Metal plain cushion 28 is used between cylinder 21 and blind flange 29
It is sealed, and passes through bolt 25 and be attached fixation.It transmits block 22 and is mounted on the plunger shaft that cylinder 21 and blind flange 29 form
It is interior, and can be in plunger shaft along axial-movement.Positive stop 23 is attached fixation, backstop with cylinder 21 using interference fit
26 connect fixation with blind flange 29 using bolt 27.In addition, pressure sensor 210 is connected through a screw thread fixation with cylinder 21, pacify
Full valve 24 is connected through a screw thread fixation with cylinder 21.
As shown in fig. 6, in one embodiment, rail module includes upper air supporting support member 31 and lower air supporting support member
34, and air supporting support member connects fixation by bolt 33 up and down.Mounting blocks 32 are in upper air supporting support member 31 and lower air supporting
Between support member 34, as shown in figure 3, the right end face of mounting blocks 32 and transmission 22 left side spherical surface of block are tangent, 32 energy of mounting blocks
Tandem is carried out under the promotion for transmitting block 22 along air-float guide rail to move,
As shown in fig. 7, in one embodiment, force module has pull rod 45, electric pushrod 412 and push rod mounting base
414, pull rod 45 is connect with electric pushrod 412, has drawstring mounting portion on pull rod 45, front end and the drawstring mounting portion of pull rod 45 lead to
Screw thread is crossed to be attached.
The drawstring mounting portion includes link block 42, compact heap 44 and fastening bolt 43.Link block 42 passes through with pull rod 45
Screw thread is attached fixation, is plane contact between compact heap 44 and link block 42, and one end of wire 6 from compact heap 44 and connects
It connects and passes through between block 42, and pressing force between link block 42 and compact heap 44 can be changed by turning fastening bolt 43, so as to
Change the compression degree of wire 6, the other end of wire 6 is connect with transmitting the aperture of 22 right end of block.
The left end of pull rod 45 coordinates with left linear bearing 47, and one end of pull rod 45 is connected with link block 42 by screw thread
It connects, pull rod 45 is connect across right linear bearing with electric pushrod 412.Pull rod 45 coordinates with right linear bearing 416.Electric pushrod
412 retaining groove is connect by pin 413 with the protrusive board of push rod mounting base 414, and push rod mounting base 414 passes through bolt and pedestal
Connection is fixed.
Force module is matched, and pass through bolt and be attached fixation by installing plate 41 with the positioning groove of pedestal, is pacified
There is T-slot in loading board 41, left and right bearing block 46/49 is attached fixation, left/right straight line with installing plate 41 by T-nut 415
The round flange face of bearing 47/417 is positioned with left/right bearing block 46/49, and is passed through bolt and be attached fixation.
As shown in figure 8, in one embodiment, buffer limit component includes installing plate 51, cushioning support-saddle 53, buffer 54
And limiting component.Installing plate 51 is matched with the positioning groove of pedestal, and is passed through bolt and be attached fixation, is had on installing plate 51
T-slot, cushioning support-saddle 53 are attached fixation with installing plate 51 by T-nut 52, and the middle part trepanning of cushioning support-saddle 53 is convenient for
The light path of laser interferometer passes through, for measuring the movement velocity of mounting blocks 32.Hydraulic type buffer 54 is logical with cushioning support-saddle 53
It crosses threaded connection to fix, for absorbing the kinetic energy of consumption mounting blocks.
The limiting component includes gag lever post 55 and cushion pad 56.55 one end of gag lever post passes through spiral shell with hydraulic type buffer 54
Line connects, and 55 other end of gag lever post is be bonded by glue with cushion pad 56, the quality such as 56 generally use felt of cushion pad or rubber
Softer material, for limiting process to be avoided to generate rigid collision.In addition, being moved along the T-slot of mounting blocks 51, buffering branch is adjusted
The position of seat, thus it is possible to vary the limiting distance of mounting blocks 32.
In the use of the present invention, corrected sensor 7 is mounted on mounting blocks 32 first, then by mounting blocks 32 mounted on upper
Between air supporting support member 31 and lower air supporting support member 34.Reset operation is first carried out before the experiments, that is, controls electric pushrod
412 drive steel wire compacting parts move to the limit on the right-right-hand limit position of push rod, and then wire 6 passes through the aperture for transmitting 22 one end of block,
Wire 6 is passed through to the gap of 44 centre of link block 42 and compact heap again, taut wire line 6 simultaneously tightens fastening bolt 43, then
Air pressure size is set, and keep the stable gas pressure in high-pressure chamber according to requirement of experiment.
It transmits block 22 and transmission block limit on the left position is moved under gas pressure, then carry out loading operation, control is electronic
Push rod 412 drives wire 6 to pull to the right, transmits block 22 and is moved right 22 right pole of transmission block by the active force of wire 6
Extreme position pushes mounting blocks 32 that its right end face is made to be in close contact with transmitting 22 left side spherical surface of block, then controls electronic push away at this time
Bar 412 continues to move right, and the pulling force that wire 6 is subject to increases rapidly, until suffered pulling force is more than the tensile strength of wire 6
The limit, wire 6 are broken suddenly.If necessary to stop loading procedure, unloading operation can be carried out, controls electric pushrod
412 gradually relax to left movement, wire 6, transmit block 22 and move to the left side for transmitting block 22 again under the influence of air pressure
Extreme position.
Negative step acceleration generates process：When wire 6 is broken suddenly, transmission 22 right-hand axis shoulder end face of block is by air pressure
Positive step active force pushes mounting blocks 32 and corrected sensor 4 to travel forward jointly, and then generates positive step acceleration (OA
Section), then do uniformly accelerated motion (AB sections) jointly under the action of air cavity pressure, as shown in Figure 9.
When the left end face of mounting blocks 32 and the cushion pad 56 of limiting component collide limiting, the kinetic energy of mounting blocks 32 leads to
It crosses hydraulic type buffer 54 to absorb, final mounting blocks 32 and corrected sensor 7 are stopped in extreme position, sensor calibration processes knot
Beam.Content described in this specification embodiment is only enumerating to the way of realization of present inventive concept, protection model of the invention
It encloses and is not construed as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention is also and in people in the art
Member according to present inventive concept it is conceivable that equivalent technologies mean.
Claims (10)
1. the calibrating installation of vibrating sensor, it is characterised in that：Calibrating installation includes the mounting blocks for installing corrected sensor
With the transmission block that step force is provided for mounting blocks, mounting blocks transmit block rear, transmitting block has and can be contacted with mounting blocks preceding
Transmission end；It transmits block to be installed in hyperbaric chamber, the transmission end for transmitting block exposes to hyperbaric chamber, transmits block and bears in hyperbaric chamber
Air pressure, transmit block with the connecting pin being connect with drawstring, drawstring connect with force module, the module that exerts a force after block is transmitted,
Air pressure is to the thrust of transmission block generation and the pulling force of drawstring on the contrary, hyperbaric chamber is with the positive stop for preventing transmission block disengaging and keeps off afterwards
Block；Drawstring be broken when, transmit block under gas pressure to mounting blocks apply positive step force, transmit block stopped by positive stop after, it is right
Mounting blocks apply negative step force.
2. the calibrating installation of vibrating sensor as described in claim 1, it is characterised in that：Rail module is by guide rail and mounting base
Composition, guide rail have the hole coordinated with mounting blocks, there is gap between mounting blocks and guide rail, filling support lubricating film in the gap.
3. the calibrating installation of vibrating sensor as claimed in claim 2, it is characterised in that：Guide rail is air-float guide rail, and air supporting is led
Rail includes lower air supporting support member and upper air supporting support member, lower air supporting support member and upper air supporting support member surround jointly with
The hole of mounting blocks cooperation, support lubricating film are air film, lower air supporting support member and upper air supporting support member be respectively provided with venthole,
The gentle connector of air admission hole, gas connector are installed on air admission hole, and gas connector is connected with low-pressure gas source；The gas overflowed from venthole is formed
Above-mentioned air film；Upper air supporting support member is attached fixation with lower air supporting support member by bolt.
4. the calibrating installation of the vibrating sensor as described in one of claim 1-3, it is characterised in that：Hyperbaric chamber have cylinder and
Blind flange, cylinder and blind flange surround high-pressure chamber；Cylinder and blind flange are equipped with the cavity volume for accommodating and transmitting block, and cavity volume is from axial direction
Through cylinder and blind flange；Backstop is fixed with blind flange, and positive stop is fixed with cylinder, and positive stop, which has, allows transmission end exposed
Through-hole.
5. the calibrating installation of vibrating sensor as claimed in claim 4, it is characterised in that：Transmission block, which has, bears pushing away for air pressure
Power stress surface, the pulling force stress surface pushed against by backstop and the stop surface pushed against by positive stop, the connecting pin for transmitting block exposes to
Hyperbaric chamber, pulling force stress surface are located at before connecting pin, and connecting pin is equipped with the aperture passed through for drawstring.
6. the calibrating installation of the vibrating sensor as described in one of claim 1-5, it is characterised in that：The module that exerts a force, which has, draws
Bar, electric pushrod and push rod mounting base, pull rod are connect with electric pushrod, have drawstring mounting portion on pull rod.
7. the calibrating installation of vibrating sensor as claimed in claim 6, it is characterised in that：Pull rod runs through linear bearing component,
Linear bearing component is a pair, and linear bearing component is made of linear bearing and bearing block, front end and the drawstring mounting portion of pull rod
It is attached by screw thread.
8. the calibrating installation of the vibrating sensor as described in one of claim 1-7, it is characterised in that：Buffer limit module is fixed
Before mounting blocks, buffer limit module has cushioning support-saddle, buffer and gag lever post, and buffer is fixed on cushioning support-saddle, delays
It rushes and gag lever post is installed on device, gag lever post is the component for being in direct contact mounting blocks.
9. the calibrating installation of vibrating sensor as claimed in claim 6, it is characterised in that：Buffer has multiple, multiple bufferings
Device is symmetrical along short transverse, and gag lever post one end is fixed with buffer, cushion pad is fixed on the other end, is opened on cushioning support-saddle
Have allow laser interferometer light path by measured hole, the laser alignment mounting blocks of laser interferometer.
10. the calibrating installation of the vibrating sensor as described in one of claim 1-9, it is characterised in that calibrating installation has base
Seat, hyperbaric chamber, rail module, force module and buffer limit module are fixedly connected respectively by respective installing plate with pedestal；
Hyperbaric chamber, rail module, force module and the mutual centering of buffer limit module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810114757.1A CN108195462B (en) | 2018-02-05 | 2018-02-05 | Calibration device of vibration sensor |
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|---|---|---|---|
| CN201810114757.1A CN108195462B (en) | 2018-02-05 | 2018-02-05 | Calibration device of vibration sensor |
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| CN108195462B CN108195462B (en) | 2020-04-03 |
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|---|---|---|---|---|
| CN112484945A (en) * | 2020-10-20 | 2021-03-12 | 北京电子工程总体研究所 | Interference-free negative step force applying device and method |
| CN112484945B (en) * | 2020-10-20 | 2022-08-19 | 北京电子工程总体研究所 | Interference-free negative step force applying device and method |
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| CN108195462B (en) | 2020-04-03 |
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