CN107807399A - Absolute gravimeter vibrating isolation system based on " Sangen " tablet spring suspension helical spring - Google Patents
Absolute gravimeter vibrating isolation system based on " Sangen " tablet spring suspension helical spring Download PDFInfo
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- CN107807399A CN107807399A CN201710887628.1A CN201710887628A CN107807399A CN 107807399 A CN107807399 A CN 107807399A CN 201710887628 A CN201710887628 A CN 201710887628A CN 107807399 A CN107807399 A CN 107807399A
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- outrigger
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- 238000002955 isolation Methods 0.000 title claims abstract description 25
- 239000000725 suspension Substances 0.000 title claims abstract description 9
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 26
- 238000007639 printing Methods 0.000 claims description 2
- 244000089486 Phragmites australis subsp australis Species 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 230000005484 gravity Effects 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 2
- 244000273256 Phragmites communis Species 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 208000005168 Intussusception Diseases 0.000 description 1
- 241001347978 Major minor Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V7/00—Measuring gravitational fields or waves; Gravimetric prospecting or detecting
- G01V7/02—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
Abstract
The invention discloses a kind of absolute gravimeter vibrating isolation system based on " Sangen " tablet spring suspension helical spring, it is related to absolute gravity measurement technical field.The system includes feedback circuit；It is provided with disk on outrigger, outrigger base, outrigger pole, reed fixed block, reed, reed chuck, disk, middle frame pole, middle frame base, adjusting screw, helical spring, reflecting prism base, Capacitive Displacement Sensor With High Accuracy, reflecting prism, magnetic cylinder coil and footing spiral on middle frame；Core includes the two level vibrating isolation system being made up of three leaf springs and three helical springs, provides two level elastic construction by the coupling of level two, increases the equivalent period of whole system by more than tens seconds, allow whole system to be equivalent to overlength spring.The present invention makes whole vibrating isolation system fluctuating signal over the ground by feedback circuit（3‑6s）There is ideal vibration isolating effect；It is simple in construction, it is easy to operate；Good technical support is provided for high-precision absolute gravimeter development.
Description
Technical field
The present invention relates to absolute gravity measurement technical field, more particularly to it is a kind of based on " Sangen " tablet spring suspension helical spring
Absolute gravimeter vibrating isolation system.
Background technology
In absolute gravity measurement, ground micro-vibration has turned into the main noise source of measurement, and vibration isolation technique can be significantly
Reduce influence of the ambient noise to accurate measurement, significant and broad prospect of application.Vibrating isolation system always is the country
Outer researcher needs one of key issue for facing and solving.A namely lowpass system, raising are vibrating isolation system in itself
The natural period of system namely improves the anti-vibration performance of system.
The vibrating isolation system in the world applied to absolute gravimeter mainly includes Super Spring (two-stage spring actives at present
Vibrating isolation system), single-stage spring active vibration isolation system, passive vibration isolation system and monitoring ground vibration buckleing by data processing method
Except system etc..
That FG5 absolute gravimeters use is exactly Super Spring, has two-stage spring structure, using major-minor spring intussusception
Form.External frame hangs internal stent by three support springs, and internal stent is by a main spring suspension by vibration isolation thing
Body.By being that whole system can be equivalent to ultra-long period spring of a cycle for 30-60s after feedback compensation, so as to realize
The vibration isolation of ultralow frequency, influence of the isolation earth pulsation to absolute gravimeter.But system considers air pressure, temperature change compensation knot
Structure so that system mechanics are complicated.
The content of the invention
The purpose of the present invention, which is that, overcomes shortcoming and defect existing for prior art, there is provided one kind is hanged based on " Sangen " tablet spring
Hang the absolute gravimeter vibrating isolation system of helical spring.
The object of the present invention is achieved like this：
The core of whole system includes the two level vibrating isolation system being made up of three leaf springs and three helical springs, passes through
The coupling of level two provides two level elastic construction；Mass of the middle frame framework as three leaf springs, due to effect of inertia, in
Frame framework keeps geo-stationary in outrigger frame movement, with ground, then helical spring framework has in the presence of inertia
Certain vibration isolating effect.Helical spring framework needs, by the reflecting prism of vibration isolation, to pass through electric capacity by three SFs
Displacement transducer detection is displacement of the reflecting prism relative to helical spring framework by vibration isolation object；The relative displacement of detection is led to
Cross feedback circuit and be converted to electric current and be input to magnetic cylinder coil, middle frame base displacement is followed vibration isolation object i.e. reflecting prism and spiral
The relative displacement of spring frame and change, increase the equivalent period of whole system by more than tens seconds, so as to allow whole system etc.
Imitate as overlength spring.
Specifically, the system includes feedback circuit；
Be provided with disk on outrigger, outrigger base, outrigger pole, reed fixed block, reed, reed chuck, disk on middle frame, in
Frame pole, middle frame base, adjusting screw, helical spring, reflecting prism base, Capacitive Displacement Sensor With High Accuracy, reflecting prism,
Magnetic cylinder coil and footing spiral；
Its position and annexation are：
3 uniform outrigger pole both ends connect disk and outrigger base on outrigger respectively, are fixed into outer framework；
3 uniform footing spirals are fixed on below outrigger base；
3 reeds are corresponded and are connected on outrigger on disk and middle frame by 3 reed fixed blocks and 3 Spring clip heads respectively
Disk；
Disk and middle frame base on frame during 3 middle frame pole both ends connect respectively, are fixed into inner frame；
The top of 3 helical springs is connected with 3 adjusting screws on middle frame on disk；
Reflecting prism chassis is by 3 SFs being distributed on middle frame immediately below disk；
From top to bottom, reflecting prism, Capacitive Displacement Sensor With High Accuracy and reflecting prism chassis are sequentially connected；
Magnetic cylinder coil, Capacitive Displacement Sensor With High Accuracy, feedback circuit are provided between middle frame base and outrigger base
It is sequentially connected with magnetic cylinder coil.
Compared with prior art, the present invention has following advantages and good effect：
1. making whole vibrating isolation system by feedback circuit, fluctuating signal (3-6s) has ideal vibration isolating effect over the ground；
2. it is simple in construction, it is easy to operate；
3. provide good technical support for high-precision absolute gravimeter development.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of disk 1 on outrigger；
Fig. 3 is configuration diagram of the embodiment of the present invention.
In figure：
A-support；
B-falling bodies mechanism；
C-the present apparatus；
0-feedback circuit；
Disk on 1-outrigger；
2-outrigger base；
3-outrigger pole；
4-reed fixed block；
5-reed；
6-reed chuck；
Disk on 7-middle frame；
8-middle frame pole；
9-middle frame base；
10-adjusting screw；
11-helical spring；
12-reflecting prism base；
13-Capacitive Displacement Sensor With High Accuracy；
14-reflecting prism；
15-magnetic cylinder coil；
16-footing spiral.
Embodiment
Describe in detail with reference to the accompanying drawings and examples：
First, it is overall
Such as Fig. 1, the system includes feedback circuit 0；
It is provided with disk 1 on outrigger, outrigger base 2, outrigger pole 3, reed fixed block 4, reed 5, reed chuck 6, middle frame
Upper disk 7, middle frame pole 8, middle frame base 9, adjusting screw 10, helical spring 11, reflecting prism base 12, high-accuracy capacitor displacement
Sensor 13, reflecting prism 14, magnetic cylinder coil 15 and footing spiral 16.
Its position and annexation are：
3 uniform both ends of outrigger pole 3 connect disk 1 and outrigger base 2 on outrigger respectively, are fixed into outer framework；
3 uniform footing spirals 16 are fixed on below outrigger base 2；
3 reeds 5 respectively by 3 reed fixed blocks 4 and 3 reed chucks 6 connect one to one on outrigger disk 1 and in
Disk 7 on frame；
Disk 7 and middle frame base 9 on frame during 3 middle both ends of frame pole 8 connect respectively, are fixed into inner frame；
The top of 3 helical springs 11 is connected with 3 adjusting screws 10 on middle frame on disk 7；
Reflecting prism chassis 12 is hung by being distributed on 3 helical springs 11 on middle frame immediately below disk 7；
From top to bottom, reflecting prism 14, Capacitive Displacement Sensor With High Accuracy 13 and reflecting prism chassis 12 are sequentially connected；
It is provided with magnetic cylinder coil 15 between middle frame base 9 and outrigger base 2, it is Capacitive Displacement Sensor With High Accuracy 13, anti-
Current feed circuit 0 and magnetic cylinder coil 15 are sequentially connected；
Protected by adjusting each part in 3 footing spirals, 16,3 adjusting screws 10 and 3 guarantee systems of reed chuck 6
Water holding is put down.
2nd, functional part
00) feedback circuit 0
Feedback circuit 0 is a kind of general negative-feedback circuit.
Its function is that displacement signal is converted into electric signal.
01) disk 1 on outrigger
Such as Fig. 2, disk 1 is a kind of disk on outrigger；
Round tube hole 1-0 is provided among it, for the printing opacity of reflecting prism 14；
Its lower surface is evenly equipped with the 1st, 2,3 screwed hole 1-1,1-2,1-3, is connected with the top of outrigger pole 3；
Its upper surface is distributed with the 1st, 2,3,4,5,6 minor thread hole 1-4,1-5,1-6,1-7,1-8,1-9, a pair two-by-two,
It is uniformly distributed, for connecting reed fixed block 4 and clip 5.
02) outrigger base 2
Outer bottom base 2 is a kind of disk, and it is evenly equipped with 6 tapped through holes above.
The lower end of outrigger base 2 is provided with 3 uniform footing spirals, and upper surface connects with 3 uniform lower ends of outrigger pole 3
Connect.
Its function is to provide support for whole device.
03) outrigger pole 3
Outrigger pole 3 is a kind of cylindrical posts, and the upper end of outrigger pole 3 connects disk 1 on outrigger, and the lower end of outrigger pole 3 connects
Connect outrigger base 2.
Its function is that disk 1 and outrigger base 2 are an entirety on connection outrigger.
04) reed fixed block 4
Reed fixed block 4 is a kind of cuboid block, and there are two minor thread holes at both ends.
Its function is clip 5 on outrigger on disk 1.
05) reed 5
Reed 5 is a kind of rectangular spring leaf, and upper end is fixed on outrigger on disk 1 by reed fixed block 4, and lower end is by spring
Piece chuck 6 is fixed on middle frame on disk 7.
Its function is to hang the inner frame of whole system.
06) reed chuck 6
Reed chuck 6 is made up of two cuboid blocks, overlapping up and down to clip reed 5, the position of clip 5.
Its function is clip 5 on middle frame on disk.
07) disk 7 on frame in
Disk 7 is a kind of disk on middle frame, and centre is provided with 60cm through hole.
Disk 7 is connected with the middle upper end of frame pole 8 on middle frame, uniform 3 adjusting screws 10 in the lower surface of disk 7 on middle frame.
Its function is to hang 3 helical springs 11 jointly with 3 uniform adjusting screws 10.
08) frame pole 8 in
Middle frame pole 8 is a kind of cylindrical posts.
Disk 7 on frame, frame base 9 in the middle lower end of frame pole 8 connection in the middle upper end of frame pole 8 connection.
Its function is disk 7 and middle frame base 9 on frame in connection.
09) frame base 9 in
Middle frame base 9 is a kind of disk, and it is evenly equipped with 3 tapped through holes above.
The lower end of frame pole 8 in the middle upper surface of frame base 9 connection, lower surface fixed coil.
Its function is to provide support for disk 7 on middle frame.
10) adjusting screw 10
Adjusting screw 10 is a kind of threaded stock；
It is connected with being distributed on the minor thread hole on middle frame on disk 7, lower end is connected helical spring 11, makes helical spring 11
The height of upper end can be adjusted, so as to frame base 9 in leveling.
11) helical spring 11
Helical spring 11 includes 3 uniform helical springs.
The upper end of 3 helical springs 11 is connected with 3 adjusting screws 10, the lower end suspension reflection rib of 3 helical springs 11
Mirror base 12.
Its function is reflecting prism base 12 is formed elastic construction with disk 7 on middle frame.
12) reflecting prism base 12
Reflecting prism base 12 is a kind of disk, fixes and supports Capacitive Displacement Sensor With High Accuracy 13 and reflecting prism
14；Reflecting prism base 12 is suspended on the lower end of helical spring 11.
Its function is to provide support for reflecting prism 14.
13) Capacitive Displacement Sensor With High Accuracy 13
Capacitive Displacement Sensor With High Accuracy 13 is a kind of general device, is made up of three capacitor plates, upper and lower two electricity
Hold pole plate and be fixed on reflecting prism base 12, intermediate capacitance pole plate is connected on middle frame pole 08.
The working mechanism of Capacitive Displacement Sensor With High Accuracy 13 is：
Signal wire is drawn in electric capacity top crown, electric capacity bottom crown and electric capacity middle plate respectively, measures reflecting prism base
12 relative to middle frame pole 08 displacement, be output in feedback circuit 0.
14) reflecting prism 14
Reflecting prism 14 is a kind of general part, is fixed on reflecting prism base 12.
Its function is as by vibration isolation object, the light beam of reflection falling bodies mechanism.
15) magnetic cylinder coil 15
Magnetic cylinder coil 15 is made up of coil and magnetic cylinder, and the center that magnetic cylinder is fixed above outrigger base 2, coil is fixed on
Center below middle frame base 9, coil are inserted in magnetic cylinder, and lead-out wires of coil is into feedback circuit 0.
Its function is to provide feedback force for device.
16) footing spiral 16
Footing spiral 16 is 3 uniform general spirals, is distributed on the lower surface of outrigger base 2.
Its function is to adjust the horizontal level of whole device.
3rd, the working mechanism of the system：
Such as Fig. 1, when earth shock, outrigger base 2 is driven to vibrate, outer framework is interior due to effect of inertia with ground vibration
Framework promotes inner frame motion with respect to ground static, but due to the active force of magnetic cylinder coil 15；Similarly, due to effect of inertia, instead
Penetrate the remains stationary of prism 14；And the capacitive displacement transducer 13 on reflecting prism base 12 can measure the phase of reflecting prism 14
Displacement for middle frame base 9, displacement variable is converted to by electric signal by feedback circuit 0；This electric signal controls magnetic cylinder
Size of current and direction on coil 15, so that inner frame is by the relative displacement size phase with reflecting prism 14 and inner frame
Deng, power in opposite direction, reflecting prism 14 is set to keep origin-location to be basically unchanged；The whole system cycle is longer, has preferable
Passive type anti-vibration performance；The coupling of reed 5, helical spring 11 provides twin-stage elastic construction, makes the position of reflecting prism 14 not
Influenceed by 3~6s earth pulsations.
4th, the application of the system
Such as Fig. 3, falling bodies mechanism B is provided with above support A, the system C is positioned over falling bodies mechanism B underface, this
The beam alignment of reflecting prism 14 and falling bodies mechanism B in system C.
When earth shock, by twin-stage elastic construction, the system C equivalent periods are stable more than tens seconds, have compared with
Good anti-vibration performance；Reflecting prism 14 is stable hardly to be influenceed in zero-bit, position by ground vibration, that is, keeps relative with the earth's core quiet
Only.
Claims (2)
1. a kind of absolute gravimeter vibrating isolation system based on " Sangen " tablet spring suspension helical spring, including feedback circuit（0）；
It is characterized in that：
It is provided with disk on outrigger（1）, outrigger base（2）, outrigger pole（3）, reed fixed block（4）, reed（5）, reed chuck
（6）, disk on middle frame（7）, middle frame pole（8）, middle frame base（9）, adjusting screw（10）, helical spring（11）, reflecting prism bottom
Seat（12）, Capacitive Displacement Sensor With High Accuracy（13）, reflecting prism（14）, magnetic cylinder coil（15）With footing spiral（16）；
Its position and annexation are：
3 uniform outrigger poles（3）Both ends connect disk on outrigger respectively（1）With outrigger base（2）, it is fixed into outer framework；
3 uniform footing spirals（16）It is fixed on outrigger base（2）Below；
3 reeds（5）Respectively by 3 reed fixed blocks（4）With 3 reed chucks（6）Connect one to one disk on outrigger（1）
With disk on middle frame（7）；
3 middle frame poles（8）Disk on frame during both ends connect respectively（7）With middle frame base（9）, it is fixed into inner frame；
3 helical springs（11）Top and middle frame on disk（7）On 3 adjusting screws（10）Connection；
Reflecting prism chassis（12）By being distributed on disk on middle frame（7）3 helical springs of underface（11）Suspension；
From top to bottom, reflecting prism（14）, Capacitive Displacement Sensor With High Accuracy（13）With reflecting prism chassis（12）It is sequentially connected；
In middle frame base（9）With outrigger base（2）Between be provided with magnetic cylinder coil（15）, Capacitive Displacement Sensor With High Accuracy
（13）, feedback circuit（0）With magnetic cylinder coil（15）It is sequentially connected.
2. a kind of absolute gravimeter vibrating isolation system based on " Sangen " tablet spring suspension helical spring as described in claim 1, it is special
Sign is：
Disk on described outrigger（1）It is a kind of disk；
It is provided with round tube hole among it（1-0）, for reflecting prism（14）Printing opacity；
Its lower surface is evenly equipped with the 1st, 2,3 screwed holes（1-1、1-2、1-3）, with outrigger pole（3）Top connection；
Its upper surface is distributed with the 1st, 2,3,4,5,6 minor thread holes（1-4、1-5、1-6、1-7、1-8、1-9）, a pair two-by-two,
Even distribution, for connecting reed fixed block（4）And clip（5）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710887628.1A CN107807399A (en) | 2017-09-27 | 2017-09-27 | Absolute gravimeter vibrating isolation system based on " Sangen " tablet spring suspension helical spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710887628.1A CN107807399A (en) | 2017-09-27 | 2017-09-27 | Absolute gravimeter vibrating isolation system based on " Sangen " tablet spring suspension helical spring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107807399A true CN107807399A (en) | 2018-03-16 |
Family
ID=61592462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710887628.1A Pending CN107807399A (en) | 2017-09-27 | 2017-09-27 | Absolute gravimeter vibrating isolation system based on " Sangen " tablet spring suspension helical spring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107807399A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB550470A (en) * | 1941-01-27 | 1943-01-08 | Bolidens Gruv Ab | Improvements in geophysical instruments |
| JP2007240396A (en) * | 2006-03-10 | 2007-09-20 | Tokyo Univ Of Agriculture & Technology | Vibration detection sensor, vibration isolation device, and exposure device |
| US20110046913A1 (en) * | 2009-08-21 | 2011-02-24 | Lockheed Martin Corporation | Synthetic vibration isolation system for freefall gravimeter |
| CN102346261A (en) * | 2011-08-29 | 2012-02-08 | 清华大学 | Active vertical vibration isolation system |
| CN103969692A (en) * | 2014-05-21 | 2014-08-06 | 哈尔滨工程大学 | Two-dimensional composite pendulum crustal inclination low-frequency vibration isolation device based on capacitive sensing |
| CN105972148A (en) * | 2016-07-15 | 2016-09-28 | 中国地震局地震研究所 | Ultralow-frequency vibration isolation device based on dual-spiral-spring system |
| CN106199749A (en) * | 2016-07-15 | 2016-12-07 | 中国地震局地震研究所 | Based on oblique pull spring and two grades of superlow frequency vibration isolating devices of leaf spring system |
| CN207216044U (en) * | 2017-09-27 | 2018-04-10 | 中国地震局地震研究所 | A kind of absolute gravimeter isolation mounting based on " Sangen " tablet spring suspension helical spring |
-
2017
- 2017-09-27 CN CN201710887628.1A patent/CN107807399A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB550470A (en) * | 1941-01-27 | 1943-01-08 | Bolidens Gruv Ab | Improvements in geophysical instruments |
| JP2007240396A (en) * | 2006-03-10 | 2007-09-20 | Tokyo Univ Of Agriculture & Technology | Vibration detection sensor, vibration isolation device, and exposure device |
| US20110046913A1 (en) * | 2009-08-21 | 2011-02-24 | Lockheed Martin Corporation | Synthetic vibration isolation system for freefall gravimeter |
| CN102346261A (en) * | 2011-08-29 | 2012-02-08 | 清华大学 | Active vertical vibration isolation system |
| CN103969692A (en) * | 2014-05-21 | 2014-08-06 | 哈尔滨工程大学 | Two-dimensional composite pendulum crustal inclination low-frequency vibration isolation device based on capacitive sensing |
| CN105972148A (en) * | 2016-07-15 | 2016-09-28 | 中国地震局地震研究所 | Ultralow-frequency vibration isolation device based on dual-spiral-spring system |
| CN106199749A (en) * | 2016-07-15 | 2016-12-07 | 中国地震局地震研究所 | Based on oblique pull spring and two grades of superlow frequency vibration isolating devices of leaf spring system |
| CN207216044U (en) * | 2017-09-27 | 2018-04-10 | 中国地震局地震研究所 | A kind of absolute gravimeter isolation mounting based on " Sangen " tablet spring suspension helical spring |
Non-Patent Citations (2)
| Title |
|---|
| 张华兴 等: "《绝对重力仪中几种隔振系统的对比测试》" * |
| 李刚 等: "《基于零长弹簧的超低频垂直隔振系统研究》" * |
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Application publication date: 20180316 |